JP6334133B2 - High color gamut LCD - Google Patents

Description

  The present invention relates to a high color gamut liquid crystal display device exhibiting a good color reproduction range with respect to the color gamut of the DCI standard or the Adobe 1998 standard, and a white light emitting diode and a high color gamut liquid crystal display device for a high color gamut liquid crystal display device used therefor The present invention relates to a color filter for use.

  Since the liquid crystal display device has characteristics such as power saving, thinness, and light weight, its demand has been increasing more and more in recent years. The liquid crystal display device is roughly classified into a transmission type liquid crystal display device using transmitted light from a backlight and a reflection type liquid crystal display device using reflection of external light. In addition, the transmissive liquid crystal display device has an advantage that the display information is easy to see when used in a dark place because the chromaticity is superior to that of the reflective liquid crystal display device.

By the way, in recent years, display devices have been required to display more vividly. As color standards for display devices, there are high color gamut standards such as DCI (Digital Cinema Initiatives) standard and Adobe 1998 standard. Has been advocated.
Also in the liquid crystal display device, it is required to reproduce the color gamut of each standard described above.

  As a method for expanding the color reproduction range of a liquid crystal display device, three colors of LEDs, a blue light emitting diode (hereinafter, the light emitting diode may be referred to as an LED), a green LED, and a red LED, are used as a backlight. It has been proposed to use a conventional RGB-LED backlight (see, for example, Patent Document 1). The RGB-LED backlight described above can emit white light with a high color gamut mixed with three colors of red light, green light, and blue light, and has good color purity. Is.

However, even when the above-described RGB-LED type backlight is used, a high color gamut liquid crystal display device having a color reproduction range that can sufficiently correspond to the color gamuts of the DCI standard and the Adobe 1998 standard described above can be obtained. There is a problem that it is difficult.
In addition, when an RGB-LED backlight is used, there is a problem that the control is complicated because it is necessary to individually control each color LED to adjust white light.

JP 2005-321727 A

  The present invention has been made in view of the above circumstances, and a high color gamut liquid crystal display device showing a good color reproduction range with respect to the color gamut of the DCI standard or the Adobe 1998 standard, and a high color gamut liquid crystal display device used therefor The main object is to provide a white LED and a color filter for a high color gamut liquid crystal display device.

  In order to solve the above problems, the present invention provides a white LED for a high color gamut liquid crystal display device used in a DCI standard high color gamut liquid crystal display device, a blue LED chip that emits blue light, and a red light. A red LED chip that emits light, and a green phosphor layer containing a green phosphor that emits green light using the blue light as an excitation source, and the peak wavelength of the blue light is within a range of 445 nm to 455 nm, and the green The peak wavelength of the light is in the range of 535 nm to 545 nm, the peak wavelength of the red light is in the range of 630 nm to 640 nm, the half width of the spectrum of the green light is in the range of 45 nm to 65 nm, and the green light A white LED for a high color gamut liquid crystal display device is provided in which the light intensity at 600 nm is 15% or more of the light intensity at the peak wavelength of the green light.

  According to the present invention, the white LED for a high color gamut liquid crystal display device has the above-described optical characteristics, and therefore, when used in a DCI standard high color gamut liquid crystal display device, it is favorable for the color gamut of the DCI standard. The color reproduction range can be shown.

  The present invention relates to a white LED for a high color gamut liquid crystal display device used in a DCI standard high color gamut liquid crystal display device, a blue LED chip emitting blue light, a green LED chip emitting green light, A red phosphor layer containing a red phosphor that emits red light using blue light as an excitation source, the peak wavelength of the blue light is within a range of 445 nm to 455 nm, and the peak wavelength of the green light is 525 nm to 540 nm. A white LED for a high color gamut liquid crystal display device, wherein the peak wavelength of the red light is in the range of 630 nm to 650 nm, and the half-value width of the spectrum of the red light is 25 nm or more To do.

  According to the present invention, the white LED for a high color gamut liquid crystal display device has the above-described optical characteristics, and therefore, when used in a DCI standard high color gamut liquid crystal display device, it is favorable for the color gamut of the DCI standard. The color reproduction range can be shown.

  The present invention relates to a white LED for a high color gamut liquid crystal display device used in an Adobe 1998 standard high color gamut liquid crystal display device, which includes a blue LED chip that emits blue light, a green LED chip that emits green light, A red phosphor layer containing a red phosphor that emits red light using blue light as an excitation source, the peak wavelength of the blue light is within a range of 445 nm to 455 nm, and the peak wavelength of the green light is 515 nm to 525 nm. And a red LED having a peak wavelength in the range of 610 nm to 650 nm and a full width at half maximum of the spectrum of the red light of 25 nm or more. To do.

  According to the present invention, the white LED for a high color gamut liquid crystal display device has the above-described optical characteristics, and therefore, when used in an Adobe 1998 standard high color gamut liquid crystal display device, it is favorable for the Adobe 1998 color gamut. The color reproduction range can be shown.

  The present invention is a color filter for a high color gamut liquid crystal display device used in a DCI standard high color gamut liquid crystal display device, and a transparent base material and a blue colored layer formed in a pattern on the transparent base material, A green colored layer and a colored layer comprising a red colored layer, wherein the peak wavelength of transmitted light of the blue colored layer is within a range of 445 nm to 465 nm, and the peak wavelength of transmitted light of the green colored layer is 520 nm to 540 nm Within the range, and the wavelength at which the transmittance of the red colored layer is 50% is in the range of 585 nm to 600 nm, the average transmittance of the red colored layer in the wavelength region of 400 nm to 550 nm is 5% or less, A high color gamut liquid crystal display characterized in that the half width of the transmission spectrum of the blue colored layer is 110 nm or less and the half width of the transmission spectrum of the green colored layer is 110 nm or less To provide a 置用 color filter.

  According to the present invention, since the color filter for a high color gamut liquid crystal display device has the above-described transmission characteristics, when used in a DCI standard high color gamut liquid crystal display device, the color filter is favorable for the color gamut of the DCI standard. The color reproduction range can be shown.

  The present invention relates to a color filter for a high color gamut liquid crystal display device used in an Adobe 1998 standard high color gamut liquid crystal display device, comprising a transparent substrate, a blue colored layer formed on the transparent substrate, and a green colored layer. And a colored layer comprising a red colored layer, the peak wavelength of the transmitted light of the blue colored layer is in the range of 445 nm to 465 nm, the peak wavelength of the transmitted light of the green colored layer is in the range of 515 nm to 535 nm, And the wavelength at which the transmittance of the red colored layer is 50% is in the range of 575 nm to 595 nm, the average transmittance of the red colored layer in the wavelength region of 400 nm to 550 nm is 5% or less, and the blue colored layer A high color gamut liquid crystal display characterized in that the half width of the transmission spectrum of the green colored layer is 100 nm or less and the half width of the transmission spectrum of the green colored layer is 110 nm or less To provide a 置用 color filter.

  According to the present invention, since the color filter for a high color gamut liquid crystal display device has the above-described transmission characteristics, when used in an Adobe 1998 high color gamut liquid crystal display device, the color filter for the Adobe 1998 standard is favorable for the color gamut of the Adobe 1998 standard. The color reproduction range can be shown.

  The present invention relates to a DCI standard high color gamut liquid crystal display having a backlight unit having a white LED and a display unit having a color filter, a counter substrate, and a liquid crystal layer formed between the color filter and the counter substrate. A high color gamut characterized in that the white LED is the white LED for a high color gamut liquid crystal display device and the color filter is the color filter for a high color gamut liquid crystal display device. A liquid crystal display device is provided.

  According to the present invention, there is provided a high color gamut liquid crystal display device that exhibits a good color reproduction range with respect to the color gamut of the DCI standard by including the white LED having the light characteristics described above and the color filter having the transmission characteristics described above can do.

  The present invention relates to a high color gamut liquid crystal display of the Adobe 1998 standard having a backlight unit having a white LED and a display unit having a color filter, a counter substrate, and a liquid crystal layer formed between the color filter and the counter substrate. A high color gamut characterized in that the white LED is the white LED for a high color gamut liquid crystal display device and the color filter is the color filter for a high color gamut liquid crystal display device. A liquid crystal display device is provided.

  According to the present invention, there is provided a high color gamut liquid crystal display device that exhibits a good color reproduction range with respect to the color gamut of the Adobe 1998 standard by including the white LED having the above-described light characteristics and the color filter having the above-described transmission characteristics. can do.

  The high color gamut liquid crystal display device of the present invention has an effect that a good color reproduction range can be exhibited with respect to the color gamut of the DCI standard or the Adobe 1998 standard.

It is a schematic sectional drawing which shows an example of the high color gamut liquid crystal display device of this invention. It is a schematic sectional drawing which shows an example of white LED for high color gamut liquid crystal display devices of this invention. It is a graph which shows an example of the spectrum of white LED for high color gamut liquid crystal display devices of the present invention. It is a schematic sectional drawing which shows an example of the color filter for high color gamut liquid crystal display devices of this invention. It is a graph which shows an example of the transmission spectrum of the color filter for high color gamut liquid crystal display devices of this invention. It is a schematic sectional drawing which shows the other example of white LED for high color gamut liquid crystal display devices of this invention. It is a graph which shows the other example of the spectrum of white LED for high color gamut liquid crystal display devices of this invention. It is a graph which shows the other example of the transmission spectrum of the color filter for high color gamut liquid crystal display devices of this invention. It is a graph which shows the other example of the spectrum of white LED for high color gamut liquid crystal display devices of this invention. It is a graph which shows the other example of the transmission spectrum of the color filter for high color gamut liquid crystal display devices of this invention.

  Hereinafter, the details of the high color gamut liquid crystal display device, the white LED for the high color gamut liquid crystal display device, and the color filter for the high color gamut liquid crystal display device of the present invention will be described.

A. High color gamut liquid crystal display device The high color gamut liquid crystal display device of the present invention has two modes due to differences in color standards. Hereinafter, each aspect will be described.

I. First Aspect The high color gamut liquid crystal display device of this aspect is a DCI standard high color gamut liquid crystal display device.
Here, the DCI standard is a digital (Cinema Initiative, LCC) group created by seven movie studios including Disney, Fox, Metro-Goldwyn-Mayer, Paramount Pictures, Sony Pictures Entertainment, Universal Studios, and Warner Bros. Studios. A cinema standard.
The color gamut of the DCI standard includes blue coordinates (x, y) = (0.150, 0.060) and green coordinates (x, y) = (0) in the xy chromaticity diagram of the CIE1931-XYZ color system. .265, 0.690) and a region represented by a triangle connecting three points of red coordinates (x, y) = (0.680, 0.320).

  The high color gamut liquid crystal display device according to this aspect further includes two embodiments due to the difference in configuration. Each embodiment will be described below.

1. First Embodiment A high color gamut liquid crystal display device according to this embodiment includes a backlight unit having a white LED, a color filter, a counter substrate, and a liquid crystal layer formed between the color filter and the counter substrate. The white LED is a blue LED chip that emits blue light, a red LED chip that emits red light, and green using the blue light as an excitation source. A green phosphor layer containing a green phosphor that emits light, wherein the peak wavelength of the blue light is within a range of 445 nm to 455 nm, the peak wavelength of the green light is within a range of 535 nm to 545 nm, and the red color The peak wavelength of light is in the range of 630 nm to 640 nm, the half width of the spectrum of the green light is in the range of 45 nm to 65 nm, The light intensity at 600 nm is 15% or more of the light intensity at the peak wavelength of the green light, and the color filter is a transparent base material, a blue colored layer formed in a pattern on the transparent base material, and green colored And a colored layer including a red colored layer, the peak wavelength of the transmitted light of the blue colored layer is within a range of 445 nm to 465 nm, and the peak wavelength of the transmitted light of the green colored layer is within a range of 520 nm to 540 nm And the wavelength at which the transmittance of the red colored layer is 50% is in the range of 585 nm to 600 nm, the average transmittance of the red colored layer in the wavelength region of 400 nm to 550 nm is 5% or less, and the blue coloring The half-value width of the transmission spectrum of the layer is 110 nm or less, and the half-value width of the transmission spectrum of the green colored layer is 110 nm or less.

Here, the high color gamut liquid crystal display device of this embodiment will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of a high color gamut liquid crystal display device of this embodiment, FIG. 2 is a schematic cross-sectional view showing an example of a white LED used in this embodiment, and FIG. 3 is this embodiment. FIG. 4 is a schematic sectional view showing an example of a color filter used in this embodiment, and FIG. 5 is a transmission spectrum of the color filter used in this embodiment. It is a graph which shows an example.

As illustrated in FIG. 1, the high color gamut liquid crystal display device 100 according to this embodiment includes a backlight unit 10 having a white LED 10A, a color filter 20A, a counter substrate 20B, and a color filter 20A and a counter substrate 20B. And a display unit 20 having the liquid crystal layer 20C formed. FIG. 1 illustrates an example in which the backlight unit 10 further includes a drive substrate 10B and a housing 10C. In addition, the display unit 20 usually includes a sealing unit 20D that seals between the color filter 20A and the counter substrate 20B.
Further, as illustrated in FIG. 2, the white LED 10A used in this embodiment includes a blue LED chip 11B that emits blue light, a red LED chip 11R that emits red light, and green light using blue light as an excitation source. And a green phosphor layer 13G containing a green phosphor 12G that emits light. As illustrated in FIG. 2, the white LED 10 </ b> A usually includes a support 14 for supporting each of the above-described configurations, and a capsule material 15 for enclosing each of the above-described configurations as necessary. is there.
In addition, as illustrated in FIG. 3, the white LED used in this embodiment has a blue light peak wavelength in the range of 445 nm to 455 nm, a green light peak wavelength in the range of 535 nm to 545 nm, and red light. The peak wavelength is in the range of 630 nm to 640 nm, the half width of the spectrum of green light is in the range of 45 nm to 65 nm, and the light intensity of green light at 600 nm is 15% or more of the light intensity at the peak wavelength of green light It is.
Moreover, as illustrated in FIG. 4, the color filter 20 </ b> A used in this embodiment includes a transparent substrate 21, a blue colored layer 22 </ b> B, a green colored layer 22 </ b> G formed in a pattern on the transparent substrate 21, and And a colored layer 22 including a red colored layer 22R. Moreover, you may have the light-shielding part 23 between the colored layers 22 as needed.
Further, as illustrated in FIG. 5, the color filter used in this embodiment has a peak wavelength of transmitted light of the blue colored layer in the range of 445 nm to 465 nm and a peak wavelength of transmitted light of the green colored layer of 520 nm to 540 nm. And the wavelength at which the transmittance of the red colored layer is 50% is in the range of 585 nm to 600 nm, the average transmittance of the red colored layer in the wavelength range of 400 nm to 550 nm is 5% or less, and blue coloring The half-value width of the transmission spectrum of the layer is 110 nm or less, and the half-value width of the transmission spectrum of the green colored layer is 110 nm or less.

According to this embodiment, a high color gamut liquid crystal display device that exhibits a good color reproduction range with respect to the color gamut of the DCI standard by including the white LED having the above-described light characteristics and the color filter having the above transmission characteristics, and can do.
Here, the color reproduction range refers to a triangular area connecting three points of the blue coordinate, the green coordinate, and the red coordinate of the high color gamut liquid crystal display device in the xy chromaticity diagram of the CIE1931-XYZ color system, and the DCI. The range of the area where the standard color gamut overlaps.

Here, as described above, in the high color gamut liquid crystal display device using the conventional RGB-LED type backlight, there is a problem that it is difficult to sufficiently correspond to the color reproduction range for the color gamut of the DCI standard. is there. The reason is considered as follows.
That is, among the LEDs of each color used in the RGB-LED backlight, it is currently difficult to obtain green LEDs and red LEDs that emit light having wavelengths corresponding to the green coordinates and red coordinates in the DCI standard. it is conceivable that. Therefore, it is considered that the white light emitted from the RGB-LED backlight does not include light having a wavelength corresponding to the green coordinate and the red coordinate in the DCI standard.
Here, in general, in a liquid crystal display device, color display is performed by adjusting each color by selectively transmitting light of a specific wavelength included in white light from a backlight using a color filter. .
Therefore, in the conventional high color gamut liquid crystal display device, white light that does not include light having a wavelength corresponding to the green coordinate and the red coordinate in the DCI standard is used. Therefore, when each color is adjusted using a color filter However, it is difficult to reproduce the green and red coordinates in the DCI standard, and it is difficult to sufficiently correspond the color reproduction range to the color gamut of the DCI standard.

On the other hand, in this embodiment, since the green light emitted from the green phosphor is used, the half width of the spectrum of the green light can be widened compared to the case where the green LED is used. As a result, white light emitted from the white LED can include light corresponding to the green coordinates in the DCI standard.
Further, in this embodiment, by using the color filter having the above-described transmission characteristics, out of the light included in the above-described white light, the wavelength corresponding to the color coordinate of each color of blue, green, and red in the DCI standard. Since light or light having a wavelength close to the above wavelength can be selectively transmitted, a high color gamut liquid crystal display device showing a good color reproduction range with respect to the color gamut of the DCI standard can be obtained. .

In the present embodiment, the reason why the red LED light source of the white LED is not a red phosphor but a red LED chip will be described.
In general, light emitted from a phosphor is weaker than light emitted from an LED. Therefore, when the light emitted from the phosphor is used as the two-color light among the three colors of red light, green light, and blue light constituting the white light, the brightness of the white light emitted from the white LED is high. This is because the display of the high color gamut liquid crystal display device according to the present embodiment is darkened and it may be difficult to perform the display itself.

The high color gamut liquid crystal display device of the present embodiment uses a green LED of the DCI standard by using a white LED used in the backlight unit, which is composed of a blue LED chip, a red LED chip, and a green phosphor layer. Of a color filter that can display white light including light corresponding to the above, and can exhibit a good color reproduction range with respect to the color gamut of the DCI standard for the above-described white LED that emits white light. It is characterized by finding the transmission characteristics.
Hereinafter, the details of the high color gamut liquid crystal display device of this embodiment will be described.

(1) Backlight part The backlight part used for this embodiment has white LED.

(A) White LED
The white LED used in this embodiment includes a blue LED chip that emits blue light, a red LED chip that emits red light, and a green phosphor that emits green light using the blue light as an excitation source. Within a range where the peak wavelength of the blue light is 445 nm to 455 nm, a peak wavelength of the green light is within a range of 535 nm to 545 nm, and a peak wavelength of the red light is within a range of 630 nm to 640 nm. The half-width of the spectrum of the green light is in the range of 45 nm to 65 nm, and the light intensity of the green light at 600 nm is 15% or more of the light intensity at the peak wavelength of the green light. .

(i) Light Characteristics of White LED The light characteristics of the white LED will be described.
The white LED emits white light by mixing blue light emitted from a blue LED chip, red light emitted from a red LED chip, and green light emitted from a green phosphor using blue light as an excitation source. Is.

First, blue light will be described.
The white LED is not particularly limited as long as the peak wavelength of the blue light is within a range of 445 nm to 455 nm. When the peak wavelength of the blue light is less than the above range or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of the DCI standard even if a color filter described later is combined. Because there is a possibility of becoming.

  The half-value width of the blue light spectrum is not particularly limited as long as a desired blue display can be performed in the high color gamut liquid crystal display device of the present embodiment, and is appropriately determined according to the blue LED chip. Specifically, the full width at half maximum of the blue light spectrum is preferably in the range of 10 nm to 50 nm, more preferably in the range of 15 nm to 45 nm, and particularly preferably in the range of 20 nm to 40 nm. When the full width at half maximum of the spectrum of the blue light is less than the above range, or exceeds the above range, the blue coordinates in the high color gamut liquid crystal display device of the present embodiment are in conformity with the DCI standard using a color filter described later. This may be difficult. Moreover, it is because it may become difficult to obtain blue LED chip itself when the half value width of the spectrum of the said blue light is less than the said range.

Next, green light will be described.
In the said white LED, if the peak wavelength of the said green light exists in the range of 535 nm-545 nm, it will not specifically limit. When the peak wavelength of the green light is less than the above range or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of the DCI standard even if a color filter described later is combined. Because there is a possibility of becoming.

  The half-value width of the green light spectrum is not particularly limited as long as it is in the range of 45 nm to 65 nm, but is preferably in the range of 45 nm to 60 nm, particularly in the range of 45 nm to 55 nm. When the full width at half maximum of the spectrum of the green light is less than the above range or exceeds the above range, the color coordinates in the high color gamut liquid crystal display device of the present embodiment are in conformity with the DCI standard using a color filter described later. This may be difficult.

Moreover, the green light in the white LED used in this embodiment has a light intensity of 600 nm that is 15% or more of the light intensity at the peak wavelength of green light. The ratio is preferably in the range of 15% to 25%, particularly preferably in the range of 15% to 20%. This is because when the ratio is less than the above range, the color adjustment may be difficult due to a decrease in the intermediate color of the light source.
The upper limit of the ratio is about 50%. This is because when the ratio exceeds the above value, the color purity may not be increased due to an increase in the intermediate color of the light source.

Next, red light will be described.
In the said white LED, if the peak wavelength of the said red light exists in the range of 630 nm-640 nm, it will not specifically limit. When the peak wavelength of the red light is less than the above range or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of the DCI standard even if a color filter described later is combined. Because there is a possibility of becoming.

  The half-value width of the spectrum of red light is not particularly limited as long as a desired red display can be performed in the high color gamut liquid crystal display device of the present embodiment, and is appropriately determined according to the red LED chip. Specifically, the full width at half maximum of the spectrum of red light is preferably in the range of 10 nm to 50 nm, more preferably in the range of 15 nm to 40 nm, and particularly preferably in the range of 20 nm to 35 nm. When the full width at half maximum of the spectrum of the red light is less than the above range or exceeds the above range, the red color coordinates in the high color gamut liquid crystal display device of the present embodiment are in conformity with the DCI standard using a color filter described later. This may be difficult. Moreover, it is because it may become difficult to obtain red LED chip itself when the half value width of the spectrum of the said red light is less than the said range.

  The ratio of light intensity (peak intensity) at the peak wavelengths of blue light, green light, and red light contained in the white LED is good for the color gamut of the DCI standard in the high color gamut liquid crystal display device of this embodiment. Is not particularly limited as long as a color reproduction range can be shown, but the peak intensity of blue light: the peak intensity of green light: the peak intensity of red light is preferably 50-100: 20-70: 50-100, It is more preferable that it is 60-100: 30-60: 60-100, and it is further more preferable that it is 70-100: 40-60: 70-100. When the ratio of the peak intensity of light of each color does not satisfy the above relationship, the white light is colored, and it is difficult to display each color with the same level of brightness using the high color gamut liquid crystal display device of this embodiment. Because there is a possibility of becoming.

  The peak wavelength, peak intensity, half-value width, etc. of each color in the white LED are values calculated by measuring the spectrum of light of each color using a spectral luminance meter SR-UL1 (manufactured by Topcon).

The white light emitted from the white LED is not particularly limited as long as it has blue light, green light, and red light having the above-described spectra. As the white light, in the xy chromaticity diagram of the CIE1931-XYZ color system, the x coordinate is in the range of 0.300 to 0.315, particularly in the range of 0.305 to 0.315, particularly 0.305. In the range of ~ 0.310, the y coordinate is in the range of 0.310 to 0.340, in particular in the range of 0.315 to 0.335, in particular in the range of 0.320 to 0.335. preferable. When the x-coordinate and the y-coordinate are less than the above range or exceed the above range, the white light is colored, and each color is displayed with the same level of brightness using the high color gamut liquid crystal display device of this embodiment. This may be difficult.
The color coordinates of white light are values calculated by measuring the light source spectrum using a spectral luminance meter SR-UL1 (manufactured by Topcon).

(Ii) Configuration of White LED The white LED used in this embodiment includes a blue LED chip that emits blue light, a red LED chip that emits red light, and green that emits green light using the blue light as an excitation source. A green phosphor layer containing a phosphor.

The green phosphor layer used in this embodiment will be described.
The green phosphor used in the present embodiment is not particularly limited as long as it can emit blue light having the above-described spectrum using blue light having the above-described spectrum as an excitation source. Specific examples of the green phosphor include β-sialon (beta-SiAlON).

  As a resin used for the green phosphor layer, any resin can be used as long as it has transparency, can disperse the green phosphor, and can cover a blue LED chip and a red LED chip described later. It is not specifically limited, It can be the same as that used for the fluorescent substance layer of general LED.

  About the shape of a green fluorescent substance layer, a formation method, etc., since it can be the same as that used for the fluorescent substance layer of a general LED, description here is abbreviate | omitted.

Next, the blue LED chip used in this embodiment will be described.
The blue LED chip used in this embodiment is not particularly limited as long as it can emit blue light having the above-described spectrum. About a blue LED chip, a well-known thing can be used.

Next, the red LED chip used in this embodiment will be described.
The red LED chip used in this embodiment is not particularly limited as long as it can emit red light having the above-described spectrum. About a red LED chip, a well-known thing can be used.

  The white LED used in this embodiment is not particularly limited as long as it has the above-described blue LED chip, red LED chip, and green phosphor layer. In addition to the above-mentioned configuration, the white LED usually has a support for supporting each configuration, a lead wire for connecting the blue LED chip and the red LED chip to the electrode, an electrode, and a capsule for enclosing the configuration Materials.

(Iii) White LED Forming Method The white LED forming method used in the present embodiment can be the same as a general LED forming method, and thus the description thereof is omitted here.

(B) Backlight part The backlight part used for this embodiment will not be specifically limited if it has white LED mentioned above, A required structure can be selected suitably and can be used. Examples of such a configuration include a drive substrate, a reflection plate, a light guide plate, and a housing. In addition, about these structures, since a well-known thing can be used, description here is abbreviate | omitted.

  The method for forming the backlight portion is not particularly limited, and a known method can be used, and thus description thereof is omitted here.

(2) Display unit The display unit used in this embodiment has a color filter, a counter substrate, and a liquid crystal layer disposed between the color filter and the counter substrate.

(A) Color filter The color filter used in this embodiment comprises a transparent substrate and a colored layer including a blue colored layer, a green colored layer, and a red colored layer formed in a pattern on the transparent substrate. And having a peak wavelength of transmitted light of the blue colored layer within a range of 445 nm to 465 nm, a peak wavelength of transmitted light of the green colored layer of 520 nm to 540 nm, and a transmittance of the red colored layer of 50%. The average transmittance of the red colored layer in the wavelength range of 400 nm to 550 nm is 5% or less, the half width of the transmission spectrum of the blue colored layer is 110 nm or less, and The full width at half maximum of the transmission spectrum of the green colored layer is 110 nm or less.

(i) Transmission Characteristics of Color Filter First, the transmission characteristics of the blue colored layer will be described.
The peak wavelength of the transmitted light of the blue colored layer is not particularly limited as long as it is in the range of 445 nm to 465 nm, but it is particularly preferable to be in the range of 445 nm to 460 nm, particularly in the range of 445 nm to 455 nm. When the peak wavelength of the transmitted light of the blue colored layer is less than the above range, or exceeds the above range, the high color gamut liquid crystal display device of the present embodiment can be used even when the backlight unit described above is used. This is because it may be difficult to sufficiently correspond the color reproduction range to the color gamut of the DCI standard.

The full width at half maximum of the transmission spectrum of the blue colored layer is not particularly limited as long as it is 110 nm or less. In particular, it is preferably 105 nm or less, particularly preferably 100 nm or less. When the full width at half maximum of the transmission spectrum of the blue colored layer exceeds the above range, the color reproduction range of the high color gamut liquid crystal display device according to the present embodiment is compared with the color gamut of the DCI standard even when the backlight portion described above is included. This is because it may be difficult to respond sufficiently.
In addition, the lower limit of the half-value width of the transmission spectrum of the blue colored layer is about 70 nm in consideration of transmittance, patternability, and the like. This is because when the half width of the transmission spectrum of the blue colored layer is less than the above value, it may be difficult to adjust the blue display of the high color gamut liquid crystal display device using the color filter.

Next, the transmission characteristics of the green colored layer will be described.
The peak wavelength of the transmitted light of the green colored layer is not particularly limited as long as it is in the range of 520 nm to 540 nm, but in particular, it is preferably in the range of 520 nm to 535 nm, particularly in the range of 520 nm to 530 nm. When the peak wavelength of the transmitted light of the green colored layer is less than the above range or exceeds the above range, the high color gamut liquid crystal display device of the present embodiment can be used even when the backlight unit described above is used. This is because it may be difficult to sufficiently correspond the color reproduction range to the color gamut of the DCI standard.

The full width at half maximum of the transmission spectrum of the green colored layer is not particularly limited as long as it is 110 nm or less. In particular, it is preferably 105 nm or less, particularly preferably 100 nm or less. When the half-value width of the transmission spectrum of the green colored layer exceeds the above range, the color reproduction range of the high color gamut liquid crystal display device of the present embodiment is compared with the color gamut of the DCI standard even when the backlight portion described above is included. This is because it may be difficult to respond sufficiently.
In addition, the lower limit of the half-value width of the transmission spectrum of the green colored layer is about 70 nm in consideration of transmittance, patternability, and the like. This is because if the half width of the transmission spectrum of the green colored layer is less than the above value, it may be difficult to adjust the green display of the high color gamut liquid crystal display device using the color filter.

Next, the transmission characteristics of the red colored layer will be described.
The wavelength at which the transmittance of the red colored layer exhibits 50% is not particularly limited as long as it is in the range of 585 nm to 600 nm, but in particular, it is in the range of 585 nm to 595 nm, particularly in the range of 590 nm to 595 nm. It is preferable. When the wavelength in the red colored layer is less than the above range or exceeds the above range, the color reproduction range of the high color gamut liquid crystal display device of the present embodiment can be achieved even when the backlight unit described above is used. This is because it may be difficult to sufficiently cope with the color gamut of the DCI standard.

The red colored layer has an average transmittance of 5% or less in the red colored layer in a wavelength range of 400 nm to 550 nm.
The average transmittance of the red colored layer in the above wavelength range is 4% or less, particularly 3% or less. When the average transmittance of the red colored layer in the wavelength range exceeds the above value, the high color gamut liquid crystal display device of this embodiment is affected by blue light and green light included in a part of the transmitted light of the red colored layer. This makes it difficult to perform a desired red display and makes it difficult to make the color reproduction range sufficiently correspond to the color gamut of the DCI standard.

  The peak wavelength and half width of the transmitted light of the blue colored layer and the green colored layer, the wavelength at which the transmittance of the red colored layer is 50%, and the average transmittance in the wavelength range of 400 nm to 550 nm are, for example, the microspectroscopic device OSP- It can be determined by measuring the transmission spectrum of the color filter using SP2000 (manufactured by OLYMPUS).

(ii) Structure of color filter The color filter used in this embodiment includes a transparent substrate, a colored layer including a blue colored layer, a green colored layer, and a red colored layer formed in a pattern on the transparent substrate. It is what has.

(Colored layer)
The colored layer contains a colorant and is usually configured by dispersing the colorant in the resin layer.

The colorant is not particularly limited as long as the colored layer of each color can have the above-described transmission characteristics, and known colorants such as pigments and dyes can be used. In particular, a dye having high color purity is preferable because the colored layer can be thinned.
As the blue coloring material, for example, pigment blue (PB) 1, PB15: 1, PB15: 3, PB15: 4, PB15: 6, PB56, PB61, PB62, and the like can be preferably used. In addition to the blue colorant, pigment violet (PV) 23 may be added to adjust contrast and color. Triarylmethane, xanthene, and rhodamine dyes may also be used.
As the green colorant, for example, pigment green (PG) 1, PG4, PG7, PG36, PG58, or the like can be suitably used. In addition to the green colorant, pigment yellow (PY) 138, PY139, PY150, and the like may be included to adjust contrast and color. An azo dye may be used.
Moreover, as a red coloring material, for example, Pigment Red (PR) 177, PR242, PR254, or PR208 can be suitably used. In addition to the red colorant, PY139, PY150, etc. may be included for adjusting the contrast and color. An azo dye may be used.

  The resin used in the colored layer is not particularly limited as long as it can disperse the above-described coloring material and can form a desired colored layer on a transparent substrate, and is a general color filter. Since it can be the same as that used for the colored layer, description here is omitted.

  The colored layer is not particularly limited as long as it has at least three colored layers of blue, green, and red, and may have a colored layer other than the above-described three colors as necessary.

  The arrangement, shape, formation method, and the like of the colored layer can be the same as those used for the colored layer of a general color filter, and thus description thereof is omitted here.

(Transparent substrate)
The transparent base material used in this embodiment supports the above-described colored layer.
As the transparent substrate, those known as a transparent substrate for general color filters can be used. For example, a glass substrate, a transparent resin film, etc. are mentioned.

(Other configurations)
As a color filter in this embodiment, if it has a transparent base material and a colored layer, it will not specifically limit, A required structure can be selected suitably and can be added.
Examples of such a configuration include a light shielding portion that partitions colored layers, a protective layer formed on the colored layer, and a columnar spacer for holding the cell gap of the high color gamut liquid crystal display device of this embodiment. However, it is not limited to these.

(Iii) Color Filter Formation Method The color filter manufacturing method used in this embodiment can be the same as a general color filter manufacturing method, and thus the description thereof is omitted here.

(B) Counter substrate Next, the counter substrate used in this embodiment will be described.

  The counter substrate used in this embodiment can be appropriately selected and used according to the driving method of the high color gamut liquid crystal display device in this embodiment.

  Here, the driving method of the high color gamut liquid crystal display device in the present embodiment is not particularly limited as long as a good image display can be performed, and is generally used for a transmissive liquid crystal display device. The driving method can be adopted. Examples of such a drive method include a TN method, an IPS method, an OCB method, and an MVA method. In the present embodiment, any of these methods can be suitably used.

(C) Liquid Crystal Layer Next, the liquid crystal layer will be described. The liquid crystal layer in this embodiment is provided between the color filter and the counter substrate. As the liquid crystal constituting the liquid crystal layer, various liquid crystals having different dielectric anisotropy and mixtures thereof can be used according to the driving method of the high color gamut liquid crystal display device of this embodiment.

  As a method for forming the liquid crystal layer, a method generally used as a method for manufacturing a liquid crystal cell can be used, and examples thereof include a vacuum injection method and a liquid crystal dropping method.

(D) Other Configurations The display unit used in this embodiment is not particularly limited as long as it has the color filter, the counter substrate, and the liquid crystal layer described above, and other necessary configurations are appropriately selected and added. be able to.
Examples of such a configuration include a polarizing plate.

(E) Method for Forming Display Unit The method for forming the display unit used in this embodiment can be the same as the display unit used in a general liquid crystal display device, and thus the description thereof is omitted here.

(3) Other Configurations The high color gamut liquid crystal display device according to the present embodiment is not particularly limited as long as it has the backlight unit and the display unit described above, and a necessary configuration can be appropriately selected and added. .

(4) High color gamut liquid crystal display device The high color gamut liquid crystal display device of this embodiment can exhibit a good color reproduction range with respect to the DCI color gamut.
The color reproduction rate for the color gamut of the DCI standard of the high color gamut liquid crystal display device of the present embodiment is not particularly limited as long as a desired display can be performed, but is preferably 98% or more, and preferably 99% or more. Is more preferable, and 100% is particularly preferable.
By setting the color reproduction rate to be equal to or higher than the above value, it is possible to show a better color reproduction range than a conventional high color gamut liquid crystal display device.
Note that the color reproduction rate for the DCI color gamut of the high color gamut liquid crystal display device is determined by using a luminance meter (SR-UL1: manufactured by Topcon Corporation) for the chromaticity at the time of monochromatic display of red, green, and blue (RGB). It is a value calculated and measured.

(5) Manufacturing method of high color gamut liquid crystal display device The manufacturing method of the high color gamut liquid crystal display device of this embodiment can be the same as the manufacturing method of a general liquid crystal display device, and will be described here. Is omitted.

2. Second Embodiment A high color gamut liquid crystal display device according to this embodiment includes a backlight unit having a white LED, a color filter, a counter substrate, and a liquid crystal layer formed between the color filter and the counter substrate. The white LED includes a blue LED chip that emits blue light, a green LED chip that emits green light, and red using the blue light as an excitation source. A red phosphor layer containing a red phosphor that emits light, wherein the peak wavelength of the blue light is within a range of 445 nm to 455 nm, the peak wavelength of the green light is within a range of 525 nm to 540 nm, and the red color The peak wavelength of light is in the range of 630 nm to 650 nm, the half-value width of the spectrum of the red light is 25 nm or more, and the color filter is transparent A substrate, and a colored layer including a blue colored layer, a green colored layer, and a red colored layer formed in a pattern on the transparent substrate, and a peak wavelength of transmitted light of the blue colored layer is from 445 nm to Within the range of 465 nm, the peak wavelength of the transmitted light of the green colored layer is within the range of 520 nm to 540 nm, and the wavelength at which the transmittance of the red colored layer exhibits 50% is within the range of 585 nm to 600 nm, 400 nm to 550 nm The average transmittance of the red colored layer in the wavelength region is 5% or less, the half width of the transmission spectrum of the blue colored layer is 110 nm or less, and the half width of the transmission spectrum of the green colored layer is 110 nm or less. It is characterized by.

The high color gamut liquid crystal display device of this embodiment will be described with reference to the drawings. FIG. 6 is a schematic cross-sectional view showing an example of a white LED used in this embodiment. FIG. 7 is a graph showing an example of a spectrum of a white LED used in this embodiment, and FIG. 8 is a graph showing an example of a transmission spectrum of a color filter used in this embodiment.
The configuration of the high color gamut liquid crystal display device of this embodiment is the same as that described with reference to FIG.
As illustrated in FIG. 6, the white LED 10A used in this embodiment includes a blue LED chip 11B that emits blue light, a green LED chip 11G that emits green light, and red light using the blue light as an excitation source. A red phosphor layer 13R containing a red phosphor 12R that emits light. Note that the reference numerals not described in FIG. 6 can be the same as the reference numerals described in FIG. 2, and thus the description thereof is omitted here.
In addition, as illustrated in FIG. 7, the white LED used in this embodiment has the blue light peak wavelength in the range of 445 nm to 455 nm, the green light peak wavelength in the range of 525 nm to 540 nm, and the above The peak wavelength of red light is in the range of 630 nm to 650 nm, and the half width of the red light spectrum is 25 nm or more.
Since the configuration of the color filter used in this embodiment is the same as that described with reference to FIG. 3, the description thereof is omitted here. As illustrated in FIG. 8, the color filter used in this embodiment has a peak wavelength of transmitted light of the blue colored layer in the range of 445 nm to 465 nm, and a peak wavelength of transmitted light of the green colored layer of 520 nm to 540 nm. And the wavelength at which the transmittance of the red colored layer is 50% is in the range of 585 nm to 600 nm, and the average transmittance of the red colored layer in the wavelength region of 400 nm to 550 nm is 5% or less, The full width at half maximum of the transmission spectrum of the blue colored layer is 110 nm or less, and the full width at half maximum of the transmission spectrum of the green colored layer is 110 nm or less.

  According to the present embodiment, the high color gamut liquid crystal display device that exhibits a good color reproduction range with respect to the color gamut of the DCI standard by including the white LED having the light characteristics described above and the color filter having the transmission characteristics described above. It can be.

More specifically, in the present embodiment, since the red light emitted from the red phosphor is used, the half-value width of the spectrum of the red light can be widened as compared with the case where the red LED is used. As a result, white light emitted from the white LED can include light corresponding to the red color coordinate in the DCI standard.
Further, in this embodiment, by using the color filter having the above-described transmission characteristics, out of the light included in the above-described white light, the wavelength corresponding to the color coordinate of each color of blue, green, and red in the DCI standard. Since light or light having a wavelength close to the above wavelength can be selectively transmitted, a high color gamut liquid crystal display device showing a good color reproduction range with respect to the color gamut of the DCI standard can be obtained. .

  In the present embodiment, the reason why the green light source of the white LED is not the green phosphor but the green LED chip is as follows. In the “1. First embodiment” described above, the red light source of the white LED is red. Since it can be the same as the reason why the LED chip is used, description thereof is omitted here.

In the high color gamut liquid crystal display device according to this embodiment, as a white LED used in the backlight unit, a red LED of the DCI standard is formed by using a blue LED chip, a green LED chip, and a red phosphor layer. A color that can be white light including light corresponding to the color coordinates, and that can exhibit a good color reproduction range with respect to the color gamut of the DCI standard for the white LED that emits white light described above. It is characterized by finding the transmission characteristics of the filter.
Hereinafter, the details of the high color gamut liquid crystal display device of this embodiment will be described.

(1) Backlight part The backlight part used for this embodiment has white LED.

(A) White LED
The white LED used in this embodiment includes a red LED that includes a blue LED chip that emits blue light, a green LED chip that emits green light, and a red phosphor that emits red light using the blue light as an excitation source. Within a range where the peak wavelength of the blue light is 445 nm to 455 nm, a peak wavelength of the green light is within a range of 525 nm to 540 nm, and a peak wavelength of the red light is within a range of 630 nm to 650 nm. The half-width of the spectrum of the red light is 25 nm or more.

(i) Light Characteristics of White LED The light characteristics of the white LED will be described.
The white LED emits white light by mixing blue light emitted from a blue LED chip, green light emitted from a green LED chip, and red light emitted from a red phosphor using blue light as an excitation source. Is.

First, blue light will be described.
The white LED is not particularly limited as long as the peak wavelength of the blue light is within a range of 445 nm to 455 nm. When the peak wavelength of the blue light is less than the above range or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of the DCI standard even if a color filter described later is combined. Because there is a possibility of becoming.

  The half-value width of the blue light spectrum is not particularly limited as long as a desired blue display can be performed in the high color gamut liquid crystal display device of the present embodiment, and is appropriately determined according to the blue LED chip. Specifically, the full width at half maximum of the blue light spectrum is preferably in the range of 10 nm to 50 nm, more preferably in the range of 15 nm to 45 nm, and particularly preferably in the range of 20 nm to 40 nm. When the full width at half maximum of the spectrum of the blue light is less than the above range, or exceeds the above range, the blue coordinates in the high color gamut liquid crystal display device of the present embodiment are in conformity with the DCI standard using a color filter described later. This may be difficult. Moreover, it is because it may become difficult to obtain blue LED chip itself when the half value width of the spectrum of the said blue light is less than the said range.

Next, green light will be described.
In the said white LED, it will not specifically limit if the peak wavelength of the said green light exists in the range of 525 nm-540 nm, However, It is preferable that it exists in the range of 525 nm-535 nm especially 530 nm-535 nm. When the peak wavelength of the green light is less than the above range or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of the DCI standard even if a color filter described later is combined. Because there is a possibility of becoming.

  The half width of the spectrum of the green light is not particularly limited as long as a desired green display can be performed in the high color gamut liquid crystal display device of the present embodiment, and is appropriately determined according to the green LED chip. Specifically, the half width of the green light spectrum is preferably in the range of 10 nm to 50 nm, more preferably in the range of 15 nm to 45 nm, and particularly preferably in the range of 20 nm to 40 nm. When the full width at half maximum of the spectrum of the green light is less than the above range or exceeds the above range, the color coordinates in the high color gamut liquid crystal display device of the present embodiment are in conformity with the DCI standard using a color filter described later. This may be difficult. Moreover, it is because it may become difficult to obtain green LED chip itself when the half value width of the spectrum of the said green light is less than the said range.

Next, red light will be described.
The white LED is not particularly limited as long as the peak wavelength of the red light is within a range of 630 nm to 650 nm, but is particularly preferably within a range of 635 nm to 650 nm, particularly within a range of 635 nm to 645 nm. When the peak wavelength of the red light is less than the above range or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of the DCI standard even if a color filter described later is combined. Because there is a possibility of becoming.

In the present embodiment, there is no particular limitation as long as the half width of the spectrum of the red light is 25 nm or more, but it is particularly preferable to be within the range of 30 nm to 90 nm, particularly within the range of 40 nm to 80 nm.
The upper limit of the half-value width of the red light spectrum is about 100 nm.
When the full width at half maximum of the spectrum of the red light is less than the above range or exceeds the above range, the red color coordinates in the high color gamut liquid crystal display device of the present embodiment are in conformity with the DCI standard using a color filter described later. This may be difficult.

The ratio of the light intensity (peak intensity) at the peak wavelengths of blue light, green light and red light contained in the white LED is good color reproduction with respect to the DCI standard color gamut in the liquid crystal display device of this embodiment. Although it will not specifically limit if the range can be shown, It is preferable that the peak intensity of blue light: The peak intensity of green light: The peak intensity of red light is 60-100: 40-80: 20-60, 70-100 Is more preferably 50 to 80:30 to 60, and still more preferably 80 to 100: 60 to 80:40 to 60.
When the ratio of the peak intensity of light of each color does not satisfy the above relationship, the white light is colored, and it is difficult to display each color with the same level of brightness using the high color gamut liquid crystal display device of this embodiment. Because there is a possibility of becoming.

  Since the measurement method of the peak wavelength, peak intensity, half-value width, spectrum, etc. of each color in the white LED can be the same as the method described in the section of “1. First embodiment” described above, Description of is omitted.

The white light emitted from the white LED is not particularly limited as long as it has blue light, green light, and red light having the above-described spectra. As the white light, in the xy chromaticity diagram of the CIE1931-XYZ color system, the x coordinate is in the range of 0.295 to 0.320, particularly in the range of 0.300 to 0.315, particularly 0.300. In the range of ~ 0.310, the y coordinate is in the range of 0.300 to 0.330, in particular in the range of 0.305 to 0.325, in particular in the range of 0.310 to 0.325. preferable. When the x-coordinate and the y-coordinate are less than the above range or exceed the above range, the white light is colored, and each color is displayed with the same level of brightness using the high color gamut liquid crystal display device of this embodiment. This may be difficult.
Note that the method for measuring the color coordinates of white light can be the same as the method described in the section “1. First Embodiment” described above, and thus the description thereof is omitted here.

(Ii) Configuration of White LED The white LED used in this embodiment includes a blue LED chip that emits blue light, a green LED chip that emits green light, and red that emits red light using the blue light as an excitation source. A red phosphor layer containing a phosphor.

The red phosphor layer used in this embodiment will be described.
The red phosphor used in the present embodiment is not particularly limited as long as it can emit red light having the above-described spectrum using blue light having the above-described spectrum as an excitation source. Specific examples of the red phosphor include CASN and SCASN.

  The resin used for the red phosphor layer, the shape of the red phosphor layer, the formation method, and the like can be the same as those described in the section “1. First embodiment” described above. Description of is omitted.

Next, the green LED chip used in this embodiment will be described.
The green LED chip used in the present embodiment is not particularly limited as long as it can emit the green light having the spectrum described above. About a green LED chip, a well-known thing can be used.

  The blue LED chip, arbitrary configuration, and white LED forming method used in this embodiment can be the same as those described in the section “1. First Embodiment” described above. Description of is omitted.

(B) Backlight part The backlight part used for this embodiment will not be specifically limited if it has white LED mentioned above, A required structure can be selected suitably and can be used. Since such a configuration can be the same as that described in the section “1. First Embodiment” described above, description thereof is omitted here.

  The method for forming the backlight portion can be the same as that described in the section “1. First Embodiment” described above, and thus the description thereof is omitted here.

(2) Display unit The display unit used in this embodiment has a color filter, a counter substrate, and a liquid crystal layer disposed between the color filter and the counter substrate.

(A) Color filter The color filter used in this embodiment comprises a transparent substrate and a colored layer including a blue colored layer, a green colored layer, and a red colored layer formed in a pattern on the transparent substrate. And having a peak wavelength of transmitted light of the blue colored layer within a range of 445 nm to 465 nm, a peak wavelength of transmitted light of the green colored layer of 520 nm to 540 nm, and a transmittance of the red colored layer of 50%. The average transmittance of the red colored layer in the wavelength range of 400 nm to 550 nm is 5% or less, the half width of the transmission spectrum of the blue colored layer is 110 nm or less, and The full width at half maximum of the transmission spectrum of the green colored layer is 110 nm or less.

(i) Transmission Characteristics of Color Filter First, the transmission characteristics of the blue colored layer will be described.
The peak wavelength of the transmitted light of the blue colored layer is not particularly limited as long as it is in the range of 445 nm to 465 nm, but it is particularly preferable to be in the range of 450 nm to 465 nm, particularly in the range of 450 nm to 460 nm. When the peak wavelength of the transmitted light of the blue colored layer is less than the above range, or exceeds the above range, the high color gamut liquid crystal display device of the present embodiment can be used even when the backlight unit described above is used. This is because it may be difficult to sufficiently correspond the color reproduction range to the color gamut of the DCI standard.

The full width at half maximum of the transmission spectrum of the blue colored layer is not particularly limited as long as it is 110 nm or less. In particular, it is preferably 105 nm or less, particularly preferably 100 nm or less. When the full width at half maximum of the transmission spectrum of the blue colored layer exceeds the above range, the color reproduction range of the high color gamut liquid crystal display device according to the present embodiment is compared with the color gamut of the DCI standard even when the backlight portion described above is included. This is because it may be difficult to respond sufficiently.
The lower limit of the half-value width of the transmission spectrum of the blue colored layer is about 70 nm in consideration of transmittance and patterning properties. This is because when the half width of the transmission spectrum of the blue colored layer is less than the above value, it may be difficult to adjust the blue display of the high color gamut liquid crystal display device using the color filter.

Next, the transmission characteristics of the green colored layer will be described.
The peak wavelength of the transmitted light of the green colored layer is not particularly limited as long as it is in the range of 520 nm to 540 nm, but in particular, it is preferably in the range of 525 nm to 540 nm, particularly in the range of 525 nm to 535 nm. When the peak wavelength of the transmitted light of the green colored layer is less than the above range or exceeds the above range, the high color gamut liquid crystal display device of the present embodiment can be used even when the backlight unit described above is used. This is because it may be difficult to sufficiently correspond the color reproduction range to the color gamut of the DCI standard.

The full width at half maximum of the transmission spectrum of the green colored layer is not particularly limited as long as it is 110 nm or less. In particular, it is preferably 105 nm or less, particularly preferably 100 nm or less. When the half-value width of the transmission spectrum of the green colored layer exceeds the above range, the color reproduction range of the high color gamut liquid crystal display device of the present embodiment is compared with the color gamut of the DCI standard even when the backlight portion described above is included. This is because it may be difficult to respond sufficiently.
Further, the lower limit of the half-value width of the transmission spectrum of the green colored layer is about 70 nm in consideration of the transmittance and patterning property. This is because if the half width of the transmission spectrum of the green colored layer is less than the above value, it may be difficult to adjust the green display of the high color gamut liquid crystal display device using the color filter.

Next, the transmission characteristics of the red colored layer will be described.
The wavelength at which the transmittance of the red colored layer exhibits 50% is not particularly limited as long as it is in the range of 585 nm to 600 nm, but in particular, it is in the range of 590 nm to 600 nm, particularly in the range of 590 nm to 595 nm. preferable. When the wavelength in the red colored layer is less than the above range or exceeds the above range, the color reproduction range of the high color gamut liquid crystal display device of the present embodiment can be achieved even when the backlight unit described above is used. This is because it may be difficult to sufficiently cope with the color gamut of the DCI standard.

The red colored layer has an average transmittance of 5% or less in the red colored layer in a wavelength range of 400 nm to 550 nm.
The average transmittance of the red colored layer in the above wavelength range is 4% or less, particularly 3% or less. When the average transmittance of the red colored layer in the wavelength range exceeds the above value, the high color gamut liquid crystal display device of this embodiment is affected by blue light and green light included in a part of the transmitted light of the red colored layer. This makes it difficult to perform a desired red display and makes it difficult to make the color reproduction range sufficiently correspond to the color gamut of the DCI standard.

  The peak wavelength of transmitted light of the blue colored layer and the green colored layer, the wavelength at which the transmittance of the red colored layer is 50%, the average transmittance in the wavelength range of 400 nm to 550 nm, and the average transmittance of the entire color filter in the visible light range The method for measuring the rate can be the same as the method described in the section “1. First Embodiment” described above, and thus the description thereof is omitted here.

(ii) Configuration of Color Filter The configuration of the color filter used in this embodiment can be the same as that described in the section “1. First Embodiment” described above. Omitted.

(B) Others Since the display unit used in the present embodiment can be the same as the contents described in the section “1. First embodiment” except for the points described above, the description here is as follows. Omitted.

(3) Other Configurations The high color gamut liquid crystal display device according to the present embodiment is not particularly limited as long as it has the backlight unit and the display unit described above, and a necessary configuration can be appropriately selected and added. .

(4) High color gamut liquid crystal display device The color reproduction rate of the high color gamut liquid crystal display device of this embodiment with respect to the color gamut of the DCI standard and the method of manufacturing the high color gamut liquid crystal display device of this embodiment are described above. 1. Since it can be made the same as the content demonstrated by the term of the 1st embodiment, description here is abbreviate | omitted.

II. Second aspect A high color gamut liquid crystal display device of this aspect includes a backlight unit having a white LED, a color filter, a counter substrate, and a display unit having a liquid crystal layer formed between the color filter and the counter substrate, A high-gamut liquid crystal display device of Adobe 1998 standard, wherein the white LED emits blue light, a blue LED chip that emits blue light, a green LED chip that emits green light, and red light using the blue light as an excitation source. A red phosphor layer containing a red phosphor that emits light, wherein the peak wavelength of the blue light is within a range of 445 nm to 455 nm, the peak wavelength of the green light is within a range of 515 nm to 525 nm, and The peak wavelength is in the range of 610 nm to 650 nm, the half width of the spectrum of the red light is 25 nm or more, and the color filter is A transparent substrate and a colored layer including a blue colored layer, a green colored layer, and a red colored layer formed on the transparent substrate, and a peak wavelength of transmitted light of the blue colored layer is 445 nm to 465 nm. Within the range, the peak wavelength of the transmitted light of the green colored layer is within the range of 515 nm to 535 nm, and the wavelength at which the transmittance of the red colored layer is 50% is within the range of 575 nm to 595 nm, and the wavelength of 400 nm to 550 nm The average transmittance of the red colored layer in the region is 5% or less, the half width of the transmission spectrum of the blue colored layer is 100 nm or less, and the half width of the transmission spectrum of the green colored layer is 110 nm or less. It is what.

The Adobe 1998 standard is a standard for professional color imaging environments and publishing / printing fields proposed by Adobe Systems.
Further, the color gamut of the Adobe 1998 standard includes blue coordinates (x, y) = (0.150, 0.060) and green coordinates (x, y) = (0) in the xy chromaticity diagram of the CIE1931-XYZ color system. .210, 0.710) and a region indicated by a triangle connecting three points of red coordinates (x, y) = (0.640, 0.330).

Here, the high color gamut liquid crystal display device of this embodiment will be described with reference to the drawings.
FIG. 9 is a graph showing an example of the spectrum of the white LED used in this embodiment, and FIG. 10 is a graph showing an example of the transmission spectrum of the color filter used in this embodiment.
The configuration of the liquid crystal display device of this embodiment, the configuration of the white LED used in this embodiment, and the configuration of the color filter can be the same as those described in FIG. 1, FIG. 4, and FIG. Explanation here is omitted.
As illustrated in FIG. 9, the white LED used in this embodiment has a blue light peak wavelength in the range of 445 nm to 455 nm, a green light peak wavelength in the range of 515 nm to 525 nm, and a red light peak wavelength. It exists in the range of 610 nm-650 nm, and the half value width of the spectrum of red light is 25 nm or more.
Further, as illustrated in FIG. 10, the color filter used in this embodiment has a peak wavelength of transmitted light of the blue colored layer within a range of 445 nm to 465 nm and a peak wavelength of transmitted light of the green colored layer of 515 nm to 535 nm. Within the range, the wavelength at which the transmittance of the red colored layer is 50% is in the range of 575 nm to 595 nm, the average transmittance of the red colored layer in the wavelength range of 400 nm to 550 nm is 5% or less, and the blue colored layer The half width of the transmission spectrum of the green colored layer is 100 nm or less, and the half width of the transmission spectrum of the green colored layer is 110 nm or less.

According to this aspect, there is provided a high color gamut liquid crystal display device that exhibits a good color reproduction range with respect to the color gamut of the Adobe 1998 standard by including the white LED having the light characteristics described above and the color filter having the transmission characteristics described above. can do.
Here, the color reproduction range refers to a triangular area connecting three points of the blue coordinate, the green coordinate, and the red coordinate of the high color gamut liquid crystal display device in the xy chromaticity diagram of the CIE1931-XYZ color system, and Adobe 1998. The range of the area where the standard color gamut overlaps.

Here, as described above, in the high color gamut liquid crystal display device using the conventional RGB-LED backlight, there is a problem that it is difficult to sufficiently correspond to the color reproduction range for the Adobe 1998 color gamut. is there. The reason is considered as follows.
That is, it is considered that it is currently difficult to obtain a red LED that emits light having a wavelength corresponding to the red coordinate in the Adobe 1998 standard among the LEDs of each color used in the RGB-LED backlight. Therefore, it is considered that the white light emitted from the RGB-LED backlight does not include light having a wavelength corresponding to the red coordinate in the Adobe 1998 standard.
Therefore, in the conventional high color gamut liquid crystal display device, white light not including light having a wavelength corresponding to the red coordinate in the Adobe 1998 standard is used. Therefore, even when each color is adjusted using a color filter, Adobe 1998 is used. It will be difficult to reproduce the red coordinates in the standard, and it will be difficult to make the color reproduction range sufficiently correspond to the color gamut of the Adobe 1998 standard.

On the other hand, in this aspect, since the red light emitted from the red phosphor is used, the half-value width of the spectrum of the red light can be widened as compared with the case where the red LED is used. As a result, the white light emitted from the white LED can include light corresponding to the red coordinates in the Adobe 1998 standard.
Further, in this aspect, by using the color filter having the transmission characteristics described above, light having wavelengths corresponding to the color coordinates of the blue, green, and red colors in the Adobe 1998 standard among the light included in the white light described above. Alternatively, since light having a wavelength close to the above wavelength can be selectively transmitted, a high color gamut liquid crystal display device that exhibits a good color reproduction range with respect to the color gamut of the Adobe 1998 standard can be obtained.

The high color gamut liquid crystal display device according to the present embodiment uses the red LED of the Adobe 1998 standard by using a white LED used in the backlight unit, which is composed of a blue LED chip, a green LED chip, and a red phosphor layer. Of a color filter that can display a good color reproduction range for the color gamut of Adobe 1998 standard with respect to the white LED that emits white light described above. It is characterized by finding the transmission characteristics.
Hereinafter, the details of the high color gamut liquid crystal display device of this aspect will be described.

1. Backlight part The backlight part used for this aspect has white LED.

(1) White LED
The white LED used in this embodiment is a red phosphor containing a blue LED chip that emits blue light, a green LED chip that emits green light, and a red phosphor that emits red light using the blue light as an excitation source. A peak wavelength of the blue light is within a range of 445 nm to 455 nm, a peak wavelength of the green light is within a range of 515 nm to 525 nm, and a peak wavelength of the red light is within a range of 610 nm to 650 nm The half-width of the red light spectrum is 25 nm or more.

(a) Light Characteristics of White LED The light characteristics of the white LED will be described.
The white LED emits white light by mixing blue light emitted from a blue LED chip, green light emitted from a green LED chip, and red light emitted from a red phosphor using blue light as an excitation source. Is.

First, blue light will be described.
The white LED is not particularly limited as long as the peak wavelength of the blue light is within a range of 445 nm to 455 nm. When the peak wavelength of the blue light is less than the above range or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of Adobe 1998 standard even if a color filter described later is combined. Because there is a possibility of becoming.

  The full width at half maximum of the spectrum of blue light is not particularly limited as long as a desired blue display can be performed in the high color gamut liquid crystal display device of this aspect, and is determined appropriately according to the blue LED chip. Specifically, the full width at half maximum of the blue light spectrum is preferably in the range of 10 nm to 50 nm, more preferably in the range of 15 nm to 45 nm, and particularly preferably in the range of 20 nm to 40 nm. When the full width at half maximum of the spectrum of the blue light is less than the above range or exceeds the above range, the color coordinates of the blue display in the high color gamut liquid crystal display device of the present embodiment are set to the Adobe 1998 standard using a color filter described later. This is because it may be difficult to make it. Moreover, it is because it may become difficult to obtain blue LED chip itself when the half value width of the spectrum of the said blue light is less than the said range.

Next, green light will be described.
The white LED is not particularly limited as long as the peak wavelength of the green light is in the range of 515 nm to 525 nm. When the peak wavelength of the green light is less than the above range, or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of Adobe 1998 standard even if a color filter described later is combined. Because there is a possibility of becoming.

  The half-value width of the spectrum of the green light is not particularly limited as long as a desired green display can be performed in the high color gamut liquid crystal display device of this aspect, and is appropriately determined according to the green LED chip. Specifically, the half width of the green light spectrum is preferably in the range of 10 nm to 50 nm, more preferably in the range of 20 nm to 40 nm, and particularly preferably in the range of 25 nm to 40 nm. When the half-value width of the spectrum of the green light is less than the above range, or exceeds the above range, the color coordinates of the green display in the high color gamut liquid crystal display device of the present embodiment are set to the Adobe 1998 standard using a color filter described later. This is because it may be difficult to make it. Moreover, it is because it may become difficult to obtain green LED chip itself when the half value width of the spectrum of the said green light is less than the said range.

Next, red light will be described.
The white LED is not particularly limited as long as the peak wavelength of the red light is within a range of 610 nm to 650 nm, but is particularly preferably within a range of 615 nm to 645 nm, particularly within a range of 615 nm to 640 nm. When the peak wavelength of the red light is less than the above range or exceeds the above range, it is difficult to sufficiently correspond to the color reproduction range for the color gamut of the Adobe 1998 standard even if a color filter described later is combined. Because there is a possibility of becoming.

In this embodiment, there is no particular limitation as long as the half width of the spectrum of the red light is 25 nm or more, but in particular, it is preferably in the range of 50 nm to 200 nm, particularly in the range of 60 nm to 180 nm.
The upper limit of the half-value width of the red light spectrum is about 250 nm.
When the full width at half maximum of the spectrum of the red light is less than the above range or exceeds the above range, the red coordinates in the high color gamut liquid crystal display device according to the present embodiment conform to the Adobe 1998 standard using a color filter described later. This may be difficult.

As the ratio of the light intensity (peak intensity) at the peak wavelengths of blue light, green light, and red light contained in the white LED, a good color reproduction range for the color gamut of Adobe 1998 standard in the liquid crystal display device of this embodiment However, it is preferable that the peak intensity of blue light: the peak intensity of green light: the peak intensity of red light is 60 to 100: 40 to 80:20 to 60, and 70 to 100: It is more preferable that it is 50-80: 30-60, and it is further more preferable that it is 80-100: 60-80: 40-60.
When the ratio of the peak intensity of light of each color does not satisfy the above relationship, the white light is colored, and it is difficult to display each color with the same level of brightness using the high color gamut liquid crystal display device of this aspect. Because there is a possibility.

  About the measuring method of the peak wavelength of each color in the said white LED, peak intensity, a half value width, a spectrum, etc., it may be the same as that described in the section of “I. First embodiment 1. First embodiment” described above. Since it is possible, explanation here is omitted.

The white light emitted from the white LED is not particularly limited as long as it has blue light, green light, and red light having the above-described spectra. As the white light, in the xy chromaticity diagram of the CIE1931-XYZ color system, the x coordinate is in the range of 0.280 to 0.310, particularly in the range of 0.285 to 0.305, particularly 0.290. In the range of .about.0.300, y coordinate in the range of 0.290 to 0.330, in particular in the range of 0.295 to 0.325, in particular in the range of 0.300 to 0.320. preferable. When the x-coordinate and y-coordinate are less than the above range or exceed the above range, the white light is colored, and each color is displayed with the same level of brightness using the high color gamut liquid crystal display device of this aspect. This may be difficult.
In addition, about the measuring method of the color coordinate of white light, since it can be the same as that of the method demonstrated in the above-mentioned item of "I. 1st aspect 1. 1st embodiment", description here is abbreviate | omitted. .

(B) Configuration of White LED The white LED used in this embodiment includes a blue LED chip that emits blue light, a green LED chip that emits green light, and red fluorescence that emits red light using the blue light as an excitation source. And a red phosphor layer containing the body.

The red phosphor layer used in this embodiment will be described.
The red phosphor used in the present embodiment is not particularly limited as long as it can emit red light having the above-described spectrum using blue light having the above-described spectrum as an excitation source. Specific examples of the red phosphor include 258-Nitride.

  The resin used for the red phosphor layer, the shape of the red phosphor layer, the formation method, and the like may be the same as those described in the section “I. First embodiment 1. First embodiment” described above. Since it is possible, explanation here is omitted.

  The green LED chip used in this embodiment can be the same as that described in the above-mentioned section “I. First embodiment 2. Second embodiment”, and thus the description thereof is omitted here.

  About the blue LED chip used for this aspect, arbitrary structures, and the formation method of white LED, it can be made to be the same as the content demonstrated by the term of the above-mentioned "I. 1st aspect 1. 1st embodiment." Therefore, the description here is omitted.

(2) Backlight part The backlight part used for this aspect will not be specifically limited if it has white LED mentioned above, A required structure can be selected suitably and can be used. Such a configuration can be the same as that described in the section “I. First embodiment 1. First embodiment” described above, and thus the description thereof is omitted here.

  About the formation method of a backlight part, since it can be made to be the same as that of what was demonstrated in the above-mentioned item of "I. 1st aspect 1. 1st embodiment", description here is abbreviate | omitted.

2. Display Unit The display unit used in this embodiment includes a color filter, a counter substrate, and a liquid crystal layer disposed between the color filter and the counter substrate.

(1) Color filter The color filter used in this embodiment has a transparent substrate and a colored layer including a blue colored layer, a green colored layer, and a red colored layer formed in a pattern on the transparent substrate. The peak wavelength of the transmitted light of the blue colored layer is in the range of 445 nm to 465 nm, the peak wavelength of the transmitted light of the green colored layer is in the range of 515 nm to 535 nm, and the transmittance of the red colored layer is 50%. The wavelength shown is in the range of 575 nm to 595 nm, the average transmittance of the red colored layer in the wavelength range of 400 nm to 550 nm is 5% or less, the half width of the transmission spectrum of the blue colored layer is 100 nm or less, and the above The half width of the transmission spectrum of the green colored layer is 110 nm or less.

(a) Transmission Characteristics of Color Filter First, the transmission characteristics of the blue colored layer will be described.
The peak wavelength of the transmitted light of the blue colored layer is not particularly limited as long as it is in the range of 445 nm to 465 nm, but it is particularly preferable to be in the range of 450 nm to 465 nm, particularly in the range of 450 nm to 460 nm. When the peak wavelength of the transmitted light of the blue colored layer is less than the above range, or exceeds the above range, even when the above-described backlight unit is used, the high color gamut liquid crystal display device of this embodiment This is because it may be difficult to make the color reproduction range sufficiently correspond to the color gamut of the Adobe 1998 standard.

  The full width at half maximum of the transmission spectrum of the blue colored layer is not particularly limited as long as it is 100 nm or less. In particular, it is preferably 98 nm or less, particularly preferably 95 nm or less. When the full width at half maximum of the transmission spectrum of the blue colored layer exceeds the above range, the color reproduction range of the high color gamut liquid crystal display device of the present embodiment is compared with the color gamut of the Adobe 1998 standard even when the backlight portion described above is included. This is because there is a possibility that it is difficult to make it sufficiently compatible. Moreover, the lower limit of the half-value width of the transmission spectrum of the blue colored layer is about 70 nm. This is because when the half width of the transmission spectrum of the blue colored layer is less than the above value, it may be difficult to adjust the blue display of the high color gamut liquid crystal display device using the color filter.

Next, the transmission characteristics of the green colored layer will be described.
The peak wavelength of the transmitted light of the green colored layer is not particularly limited as long as it is in the range of 515 nm to 535 nm, but it is particularly preferable to be in the range of 520 nm to 535 nm, particularly in the range of 520 nm to 530 nm. When the peak wavelength of the transmitted light of the green colored layer is less than the above range, or exceeds the above range, the high color gamut liquid crystal display device of this embodiment can be used even when the backlight unit described above is used. This is because it may be difficult to make the color reproduction range sufficiently correspond to the color gamut of the Adobe 1998 standard.

The full width at half maximum of the transmission spectrum of the green colored layer is not particularly limited as long as it is 110 nm or less. In particular, it is preferably 105 nm or less, particularly preferably 100 nm or less. When the full width at half maximum of the transmission spectrum of the green colored layer exceeds the above range, the color reproduction range of the high color gamut liquid crystal display device of the present embodiment is compared with the color gamut of the Adobe 1998 standard even when the backlight portion described above is included. This is because there is a possibility that it is difficult to make it sufficiently compatible.
The lower limit of the half-value width of the transmission spectrum of the green colored layer is about 70 nm.
This is because if the half width of the transmission spectrum of the green colored layer is less than the above value, it may be difficult to adjust the green display of the high color gamut liquid crystal display device using the color filter.

Next, the transmission characteristics of the red colored layer will be described.
The wavelength at which the transmittance of the red colored layer exhibits 50% is not particularly limited as long as it is in the range of 575 nm to 595 nm, but in particular, it is preferably in the range of 580 nm to 595 nm, particularly preferably in the range of 580 nm to 590 nm. . When the wavelength in the red colored layer is less than the above range or exceeds the above range, even if the backlight unit described above is used, the color reproduction range of the high color gamut liquid crystal display device of this embodiment is Adobe 1998. This is because it may be difficult to sufficiently cope with the standard color gamut.

The red colored layer has an average transmittance of 5% or less in the red colored layer in a wavelength range of 400 nm to 550 nm.
The average transmittance of the red colored layer in the above wavelength range is 4% or less, particularly 3% or less. In the high color gamut liquid crystal display device of this embodiment, when the average transmittance of the red colored layer in the wavelength range exceeds the above value, due to the influence of blue light and green light contained in part of the transmitted light of the red colored layer, This is because it is difficult to perform a desired red display, and it may be difficult to make the color reproduction range sufficiently correspond to the color gamut of the Adobe 1998 standard.

  The methods for measuring the peak wavelength, the half width, the wavelength at which the transmittance of the red colored layer is 50% and the average transmittance in the wavelength range of 400 nm to 550 nm of the blue colored layer and the green colored layer are described in “I. 1 Aspect 1. Since it can be the same as the method explained in the section of “first embodiment”, the explanation is omitted here.

(b) Configuration of color filter The configuration of the color filter used in the present embodiment can be the same as that described in the section “I. First embodiment 1. First embodiment” described above. The description here is omitted.

(2) Others Since the display unit used in this embodiment can be the same as the contents described in the above-mentioned section “I. First embodiment 1. First embodiment”, The description here is omitted.

3. Other Configurations The high color gamut liquid crystal display device according to the present embodiment is not particularly limited as long as it includes the backlight unit and the display unit described above, and a necessary configuration can be appropriately selected and added.

4). High color gamut liquid crystal display device The high color gamut liquid crystal display device of this aspect can exhibit a good color reproduction range with respect to the color gamut of the Adobe 1998 standard.
The color reproduction rate for the color gamut of the Adobe 1998 standard of the high color gamut liquid crystal display device of this aspect is not particularly limited as long as a desired display can be performed, but is preferably 98% or more, and preferably 99% or more. Is more preferable, and 100% is particularly preferable. By setting the color reproduction rate to be equal to or higher than the above value, it is possible to show a better color reproduction range than a conventional high color gamut liquid crystal display device.
Note that the color reproduction rate of the above-described high color gamut liquid crystal display device with respect to the color gamut of the Adobe 1998 standard is a luminance meter (SR-UL1: manufactured by Topcon Corporation) for chromaticity when displaying red, green, and blue (RGB) in a single color. It is the value which was measured using and calculated.

5. Manufacturing method of high color gamut liquid crystal display device The manufacturing method of the high color gamut liquid crystal display device of this aspect can be the same as the manufacturing method of a general liquid crystal display device, and thus the description thereof is omitted here.

B. White LED for high color gamut LCD
The white LED for a high color gamut liquid crystal display device of the present invention (hereinafter sometimes simply referred to as a white LED) has two modes depending on the color standard of the high color gamut liquid crystal display device used. . Hereinafter, each aspect will be described.

I. First Aspect The white LED of this aspect is used for a DCI standard high color gamut liquid crystal display device. The white LED of this aspect further has two embodiments due to the difference in configuration. Each embodiment will be described below.

1. First Embodiment A white LED for a high color gamut liquid crystal display device according to this embodiment is a white LED for a high color gamut liquid crystal display device used in a DCI standard high color gamut liquid crystal display device, and emits blue light. It has a LED chip, a red LED chip that emits red light, and a green phosphor layer that contains a green phosphor that emits green light using the blue light as an excitation source, and the peak wavelength of the blue light is 445 nm to In the range of 455 nm, the peak wavelength of the green light is in the range of 535 nm to 545 nm, the peak wavelength of the red light is in the range of 630 nm to 640 nm, and the half width of the spectrum of the green light is in the range of 45 nm to 65 nm. The green light has a light intensity at 600 nm of 15% or more of the light intensity at the peak wavelength of the green light.

  About the structure of the white LED of this embodiment, and the example of a spectrum, since it can be made to be the same as that of the content demonstrated in FIG. 2 and FIG. 3, description here is abbreviate | omitted.

  According to this embodiment, when the white LED has the above-described optical characteristics, when used in a DCI standard high color gamut liquid crystal display device, the white LED exhibits a good color reproduction range with respect to the DCI standard color gamut. be able to.

  Here, in the RGB-LED type backlight suitably used in the conventional high color gamut liquid crystal display device, the brightness and color of white light are controlled by controlling the LEDs of each color and performing intermediate color display. Since it is necessary to adjust the taste, it is necessary to individually control the LEDs of each color, and there is a problem that the control is complicated.

  On the other hand, since the white LED of this embodiment can be used for a backlight as a monochromatic light source, the control can be performed more easily.

  Moreover, according to this embodiment, since the luminous efficiency of white LED can be made favorable, the backlight using the said white LED can be reduced in size.

  The white LED of this embodiment can be the same as the white LED described in the above-mentioned section “A. High color gamut liquid crystal display device I. First embodiment 1. First embodiment”. Description of is omitted.

2. Second Embodiment A white LED for a high color gamut liquid crystal display device according to this embodiment is a white LED for a high color gamut liquid crystal display device used in a DCI standard high color gamut liquid crystal display device, and emits blue light. It has an LED chip, a green LED chip that emits green light, and a red phosphor layer that contains a red phosphor that emits red light using the blue light as an excitation source, and the peak wavelength of the blue light is 445 nm to In the range of 455 nm, the peak wavelength of the green light is in the range of 525 nm to 540 nm, the peak wavelength of the red light is in the range of 630 nm to 650 nm, and the half width of the spectrum of the red light is 25 nm or more. It is characterized by.

  About the structure of the white LED of this embodiment, and the example of a spectrum, since it can be made to be the same as that of what was demonstrated in FIG. 6 and FIG. 7, description here is abbreviate | omitted.

According to this embodiment, when the white LED has the above-described optical characteristics, when used in a DCI standard high color gamut liquid crystal display device, the white LED exhibits a good color reproduction range with respect to the DCI standard color gamut. be able to.
Moreover, according to this embodiment, since the white LED of this embodiment can be used for a backlight as a monochromatic light source, the control can be performed more easily.

  The white LED of this embodiment can be the same as the white LED described in the above-mentioned section “A. High color gamut liquid crystal display device I. First embodiment 2. Second embodiment”. Description of is omitted.

II. Second Aspect The white LED for a high color gamut liquid crystal display device according to this aspect is a white LED for a high color gamut liquid crystal display device used in an Adobe 1998 standard high color gamut liquid crystal display device, and emits blue light. A green LED chip that emits green light, and a red phosphor layer that contains a red phosphor that emits red light using the blue light as an excitation source, and the peak wavelength of the blue light is 445 nm to 455 nm Within the range, the peak wavelength of the green light is within the range of 515 nm to 525 nm, the peak wavelength of the red light is within the range of 610 nm to 650 nm, and the half width of the spectrum of the red light is 25 nm or more It is what.

  About the structure of the white LED of this aspect, and the example of a spectrum, since it can be made to be the same as that of the content demonstrated in FIG. 6 and FIG. 9, description here is abbreviate | omitted.

According to this aspect, since the white LED has the above-described optical characteristics, when used in an Adobe 1998 high color gamut liquid crystal display device, the white LED exhibits a good color reproduction range with respect to the Adobe 1998 standard color gamut. Can do.
Moreover, according to this aspect, since the white LED of this aspect can be used for a backlight as a monochromatic light source, the control can be performed more easily.

  The white LED of this aspect can be the same as the white LED described in the above-mentioned section “A. High color gamut liquid crystal display device II. Second aspect”, and thus the description thereof is omitted here.

C. Color filter for high color gamut liquid crystal display device The color filter for high color gamut liquid crystal display device of the present invention (hereinafter sometimes simply referred to as a color filter) is the color standard of the high color gamut liquid crystal display device used. Due to the difference, it has two aspects. Hereinafter, each aspect will be described.

I. First aspect A color filter for a high color gamut liquid crystal display device according to the present aspect is a color filter for a high color gamut liquid crystal display device used in a DCI standard high color gamut liquid crystal display device, comprising: a transparent substrate; A blue colored layer, a green colored layer, and a colored layer including a red colored layer formed in a pattern on the material, and the peak wavelength of transmitted light of the blue colored layer is within a range of 445 nm to 465 nm, the green color The red coloration in the wavelength range of 400 nm to 550 nm when the peak wavelength of the transmitted light of the colored layer is in the range of 520 nm to 540 nm, and the wavelength in which the transmittance of the red colored layer is 50% is in the range of 585 nm to 600 nm. The average transmittance of the layer is 5% or less, the half width of the transmission spectrum of the blue colored layer is 110 nm or less, and the half width of the transmission spectrum of the green colored layer is 110 It is characterized by being not more than nm.

  The configuration of the color filter of this aspect and the example of the spectrum can be the same as those described with reference to FIGS. 4, 5, and 8, and a description thereof is omitted here.

  According to this aspect, when the color filter has the above-described transmission characteristics, when used in a DCI standard high color gamut liquid crystal display device, the color filter exhibits a good color reproduction range with respect to the DCI standard color gamut. Can do.

  The color filter of this aspect can be the same as the color filter described in the above-mentioned section “A. High color gamut liquid crystal display device I. First aspect”, and thus the description thereof is omitted here.

II. Second aspect A color filter for a high color gamut liquid crystal display device according to this aspect is a color filter for a high color gamut liquid crystal display device used in an Adobe 1998 standard high color gamut liquid crystal display device, comprising: a transparent substrate; A blue colored layer formed on the material, a green colored layer, and a colored layer comprising a red colored layer, and a peak wavelength of transmitted light of the blue colored layer is within a range of 445 nm to 465 nm, and the green colored layer The peak wavelength of transmitted light is in the range of 515 nm to 535 nm, and the wavelength at which the transmittance of the red colored layer is 50% is in the range of 575 nm to 595 nm, and the average of the red colored layer in the wavelength range of 400 nm to 550 nm The transmittance is 5% or less, the half width of the transmission spectrum of the blue colored layer is 100 nm or less, and the half width of the transmission spectrum of the green colored layer is 110. It is characterized by being not more than nm.

  The configuration of the color filter of this aspect and the example of the spectrum can be the same as the contents described with reference to FIGS. 4 and 10, and thus the description thereof is omitted here.

  According to this aspect, when the color filter has the above-described transmission characteristics, when used in an Adobe 1998 high color gamut liquid crystal display device, it exhibits a good color reproduction range with respect to the Adobe 1998 standard color gamut. Can do.

  The color filter of this aspect can be the same as the color filter described in the above-mentioned section “A. High color gamut liquid crystal display device II. Second aspect”, and thus the description thereof is omitted here.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

I. DCI standard liquid crystal display device [Example 1]
1. Production of white LED Blue LED chip with a blue light peak wavelength of 452.5 nm, a red LED chip with a red light peak wavelength of 623 nm, and a green phosphor containing β sialon and a green light with a peak wavelength of 535 nm green A white LED having the spectrum of FIG. 3 having a phosphor layer was produced by the following procedure.
Surface processing was performed on the base material to form a blue LED chip and a red LED chip. Thereafter, an electrode was formed, and a protective film was further formed. Contact holes were formed in the protective film on the electrodes by photolithography and wire bonding was performed. Then, the green fluorescent substance layer was apply | coated and white LED was produced.

2. Production of color filter Blue light transmission layer has a peak wavelength of 455 nm, transmission spectrum half-value width is 100 nm, green color layer has a transmission light peak wavelength of 530 nm, transmission spectrum has a half-value width of 100 nm, and the transmittance of the red color layer A color filter having the transmission spectrum of FIG. 5 in which the wavelength of 50% is 592 nm and the average transmittance of the red colored layer from 400 nm to 550 nm is 1.8% was prepared by the following procedure.

(Preparation of curable resin composition A)
A polymerization tank is charged with 63 parts by weight of methyl methacrylate (MMA), 12 parts by weight of acrylic acid (AA), 6 parts by weight of 2-hydroxyethyl methacrylate (HEMA), and 88 parts by weight of diethylene glycol dimethyl ether (DMDG). After stirring and dissolving, 7 parts by weight of 2,2′-azobis (2-methylbutyronitrile) was added and dissolved uniformly.
Then, it stirred at 85 degreeC under nitrogen stream for 2 hours, and also was made to react at 100 degreeC for 1 hour.
7 parts by weight of glycidyl methacrylate (GMA), 0.4 parts by weight of triethylamine, and 0.2 parts by weight of hydroquinone were further added to the resulting solution, and the mixture was stirred at 100 ° C. for 5 hours to obtain a copolymer resin solution ( A solid content of 50%) was obtained.
Next, the following materials were stirred and mixed at room temperature to obtain a curable resin composition A.

<Composition of curable resin composition A>
-Copolymer resin solution (solid content 50%): 16 parts by weight-Dipentaerythritol pentaacrylate (Sartomer SR399)
: 24 parts by weight-Orthocresol novolac-type epoxy resin (Epico Shell Epoxy Epicoat 180S70): 4 parts by weight-2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one: 4 weights Parts ・ Diethylene glycol dimethyl ether: 52 parts by weight

(Formation of light-shielding colored resin layer)
First, the following components were mixed and sufficiently dispersed with a sand mill to prepare a black pigment dispersion.
<Composition of black pigment dispersion>
Black pigment (Mitsubishi Chemical Corporation # 2600): 20 parts by weight Polymer dispersion (Bic Chemie Japan, Ltd. Disperbyk 111)
: 16 parts by weight-Solvent (diethylene glycol dimethyl ether): 64 parts by weight

Next, the components of the following amounts were sufficiently mixed to obtain a light-shielding colored layer composition.
<Composition of composition for light-shielding colored layer>
-Black pigment dispersion: 50 parts by weight-Curable resin composition A: 20 parts by weight-Diethylene glycol dimethyl ether: 30 parts by weight

The light-shielding colored layer composition was applied onto a substrate with a spin coater and dried at 100 ° C. for 3 minutes to form a light-shielding colored layer.
The light-shielding colored layer is exposed to a light-shielding pattern using a photomask with an ultrahigh pressure mercury lamp, and then developed with a 0.05 wt% aqueous potassium hydroxide solution, and then the substrate is left in an atmosphere at 230 ° C. for 30 minutes. This was formed by heat treatment.

(Formation of red colored layer)
A coating film having a thickness of 2.5 μm was formed by spin coating using a red curable resin composition having the following composition. The thickness of the coating film was adjusted so that the red colored layer had the transmission characteristics shown in FIG. Thereafter, the coating film was dried in an oven at 70 ° C. for 3 minutes.
Next, a photomask is placed at a distance of 100 μm from the coating film of the red curable resin composition, and ultraviolet rays are applied only to the region corresponding to the colored layer formation region using a 2.0 kW ultrahigh pressure mercury lamp by a proximity aligner. Irradiated for 10 seconds.
Subsequently, it was immersed in 0.05 wt% potassium hydroxide aqueous solution (liquid temperature 23 degreeC) for 1 minute, and alkali development was carried out, and only the uncured part of the coating film of a red curable resin composition was removed.
Thereafter, the substrate was left in an atmosphere of 200 ° C. for 15 minutes to form a red colored layer pattern (hereinafter also referred to as a relief pattern).

<Composition of red curable resin composition>
・ C. I. Pigment Red 177: 3 parts by weight C.I. I. Pigment Red 254: 4 parts by weight Polysulfonic acid type polymer dispersant: 3 parts by weight Curable resin composition A: 23 parts by weight 3-methoxybutyl acetate: 67 parts by weight

(Formation of green colored layer)
Next, a pattern composed of a green colored layer in a predetermined region by the same method as the red colored layer pattern, except that a coating film having a thickness of 2.5 μm was formed using a green curable resin composition having the following composition: (Also called a relief pattern) was formed. The thickness of the coating film was adjusted so that the green colored layer had the transmission characteristics shown in FIG.

<Composition of green curable resin composition>
・ C. I. Pigment Green 58: 5 parts by weight C.I. I. Pigment Yellow 138: 3 parts by weight Polysulfonic acid type polymer dispersant: 3 parts by weight Curable resin composition A: 22 parts by weight 3-methoxybutyl acetate: 67 parts by weight

(Formation of blue colored layer)
In addition, a pattern comprising a blue colored layer in a predetermined region by the same method as the red colored layer pattern, except that a coating film having a thickness of 2.5 μm was formed using a blue curable resin composition having the following composition ( Also called a relief pattern). The thickness of the coating film was adjusted so that the blue colored layer had the transmission characteristics shown in FIG.

<Composition of blue curable resin composition>
・ C. I. Pigment Blue 15: 6: 4 parts by weight C.I. I. Pigment Violet 23: 1 part by weight-Polysulfonic acid type polymer dispersant: 3 parts by weight-Curable resin composition A: 25 parts by weight-3-methoxybutyl acetate: 67 parts by weight

3. Production of high color gamut liquid crystal display device An alignment film was formed on a color filter and a counter substrate, and a liquid crystal was dropped to obtain a bonded display portion. Moreover, the backlight part was obtained by attaching multiple white LED mentioned above to the housing | casing provided with the drive board | substrate. A high color gamut liquid crystal display device was obtained by disposing the display portion facing the counter substrate side and the light emission side of the backlight.

[Example 2]
(Production of white LED)
A blue LED chip having a blue light peak wavelength of 452.5 nm, a green LED chip having a green light peak wavelength of 542 nm, and a red phosphor layer containing CASN as a red phosphor and a peak wavelength of red light of 615 nm A white LED having the spectrum of FIG. 7 was produced by the following procedure.
A white LED was produced in the same manner as in Example 1 except that a green chip was formed on the substrate instead of the red LED chip and a red phosphor layer was formed instead of the green phosphor layer.

(Production of color filter)
The peak wavelength of the transmitted light of the blue colored layer is 456 nm, the half width of the transmission spectrum is 100 nm, the peak wavelength of the transmitted light of the green colored layer is 525 nm, the half width of the transmission spectrum is 94 nm, and the transmittance of the red colored layer is 50%. A color filter having the transmission spectrum of FIG. 8 in which the wavelength becomes 591 nm and the average transmittance of the red colored layer from 400 nm to 550 nm is 4.2% was formed. The color filter was produced in the same manner as in Example 1 except that the curable resin composition of each color of red, green and blue was applied with a predetermined chromaticity.

(Production of high color gamut liquid crystal display device)
A high color gamut liquid crystal display device was produced in the same manner as in Example 1 except that the above-described white LED and color filter were used.

[Comparative Example 1]
A liquid crystal display device was produced in the same manner as in Example 1 except that the white LED was changed to a light source composed of a blue LED chip and a YAG phosphor.

[Comparative Example 2]
A liquid crystal display device was produced in the same manner as in Example 1 except that the white LED was changed to an RGB-LED light source. The RGB-LED light source has a blue light peak wavelength of 448 nm, a blue LED chip with a half-value width of 22 nm, a green light peak wavelength of 521 nm, a half-value width of 35 nm, a red light peak wavelength of 632 nm, and a half-value width of 15 nm. What has a red LED chip was used. The combination of LED chips of each color in the RGB-LED light source is an optimized combination of the peaks of each color when the current density applied to the RGB-LED light source is 300 mA / mm ² .

[Evaluation]
When the luminance of the high color gamut liquid crystal display devices (high color gamut LCDs) of Example 1, Example 2, Comparative Example 1 and Comparative Example 2 are made equal, the color reproduction rate for the color gamut of the DCI standard, the LED light source The size, the luminous efficiency of the LED light source, and the average transmittance of the color filter (CF) were examined. The results are shown in Table 1. In addition, about the magnitude | size of the LED light source in Table 1, and the luminous efficiency of an LED light source, it represents with the ratio when the value in the comparative example 2 is set to 1. The LED light source refers to either a white LED or an RGB-LED light source. The average transmittance of CF in this evaluation is the average transmittance of CF when different LED light sources are used in each example and each comparative example with respect to the color filter common to each example and each comparative example. is there.
In Table 1, with respect to the driving efficiency of the backlight, ○ indicates that the white LED is used in comparison with the RGB-LED light source when the luminance of the high color gamut liquid crystal display device is equal. This shows that it is easy to control the driving of the backlight.

II. Adobe 1998 Standard Liquid Crystal Display Device [Example 3]
(Production of white LED)
A white LED having the spectrum of FIG. 9 having a blue LED chip of 452.5 nm, a green LED chip of 527.5 nm, and a red phosphor layer containing 258-Nitride as a red phosphor and a peak wavelength of red light of 615 nm Was prepared by the following procedure.
A white LED was produced in the same manner as in Example 1 except that a green chip was formed on the substrate instead of the red LED chip and a red phosphor layer was formed instead of the green phosphor layer.

(Production of color filter)
The peak wavelength of the transmitted light of the blue colored layer is 455 nm, the half width of the transmission spectrum is 89 nm, the peak wavelength of the transmitted light of the green colored layer is 527 nm, the half width of the transmission spectrum is 88 nm, and the transmittance of the red colored layer is 50%. A color filter having the transmission spectrum of FIG. 10 having a wavelength of 585 nm and an average transmittance of 400% to 550 nm of the red colored layer of 3.4% was produced by the following procedure. The color filter was produced in the same manner as in Example 1 except that the curable resin composition of each color of red, green and blue was applied with a predetermined chromaticity.

(Production of high color gamut liquid crystal display device)
A high color gamut liquid crystal display device was produced in the same manner as in Example 1 except that the above-described white LED and color filter were used.

[Comparative Example 3]
A high color gamut liquid crystal display device was prepared in the same manner as in Example 3 except that an RGB-LED light source was produced using a GaN-based semiconductor element for the blue LED chip and the green LED chip, and an AlGaInP-based semiconductor element for the red LED chip. Produced. The combination of LED chips of each color in the RGB-LED light source is an optimized combination of the peaks of each color when the current density applied to the RGB-LED light source is 300 mA / mm ² .

[Evaluation]
When the luminance of the high color gamut liquid crystal display devices of Example 3 and Comparative Example 3 are made equal, the color reproduction rate for the Adobe 1998 color gamut, the size of the LED light source, the luminous efficiency of the LED light source, and the average transmittance of CF I investigated. The results are shown in Table 2. In Table 2, the brightness of the high color gamut liquid crystal display device, the size of the LED light source, and the light emission efficiency of the LED light source are expressed as a ratio when the value in Comparative Example 3 is 1. The average transmittance of CF and the driving efficiency of the backlight were evaluated in the same manner as in Table 1 above.

10 ... Backlight 10A ... White LED
11B ... Blue LED chip 11G ... Green LED chip 11R ... Red LED chip 12G ... Green phosphor 12R ... Red phosphor 13G ... Green phosphor layer 13R ... Red phosphor layer 20 ... Display unit 20A ... Color filter 20B ... Counter substrate 20C ... Liquid crystal layer 21 ... Transparent substrate 22 ... Colored layer 22B ... Blue colored layer 22G ... Green colored layer 22R ... Red colored layer 100 ... High color gamut liquid crystal display device

Claims (3)

A transparent base material, a blue colored layer formed in a pattern on the transparent base material and having a peak wavelength of transmitted light in a range of 445 nm to 465 nm, a peak wavelength of transmitted light in a range of 520 nm to 540 nm, A high color gamut comprising a color filter having a green colored layer having a half width of a transmission spectrum of 110 nm or less and a colored layer having a red colored layer having an average transmittance of 5% or less in a wavelength range of 400 nm to 550 nm A white light emitting diode for a high color gamut liquid crystal display device used in a liquid crystal display device,
A blue light emitting diode chip that emits blue light, a red light emitting diode chip that emits red light, and a green phosphor layer that contains a green phosphor that emits green light using the blue light as an excitation source,
The peak wavelength of the blue light is within a range of 445 nm to 455 nm, the peak wavelength of the green light is within a range of 535 nm to 545 nm, and the peak wavelength of the red light is within a range of 630 nm to 640 nm,
The full width at half maximum of the spectrum of the green light is in the range of 45 nm to 65 nm;
Light intensity of 600nm of the green light state, and are more than 15% of the light intensity of the peak wavelength of the green light,
A white light emitting diode for a high color gamut liquid crystal display device, wherein a wavelength at which the transmittance of the red colored layer exhibits 50% is in a range of 590 nm to 595 nm . 2. The white light emitting diode for a high color gamut liquid crystal display device according to claim 1, wherein a half width of a transmission spectrum of the blue colored layer is 110 nm or less. The high color gamut liquid crystal display device for white light emitting diodes, high color gamut liquid crystal display device according to claim 1 or claim 2, characterized by being used in the backlight of the high color gamut liquid crystal display device as a monochromatic light source White light emitting diode.

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