CN107561781A - Display device - Google Patents

Abstract

A display device comprises a display panel, the display panel emits a green light when displaying a green picture at the highest gray scale, the green light has a green energy and a green color point, the display panel emits a blue light when displaying a blue picture at the highest gray scale, the blue light has a blue energy and a blue color point, the ratio of the green energy to the blue energy is between 0.7 and 1.5, the green color point corresponds to CIE 1931xy chromaticity coordinates, and the coordinate range of the green color point is between the equation y-48.85 x²+21.987x-1.7766 and equation y-48.85 x²+27.849x-3.2717, the y coordinate is between 0.68 and 0.72. The display device of the invention has high color gamut and better display quality.

Description

display device

This application was filed on August 27, 2013, with the application number "201310376044.X", and the divisional application of the Chinese invention patent application with the title of the invention "display device"

technical field

The present invention relates to a display device, in particular to a display device with high color gamut and better display color quality.

Background technique

With the advancement of technology, flat panel display devices have been widely used in various fields, especially liquid crystal display devices, which have gradually replaced traditional cathode ray tube display devices due to their superior characteristics such as light and thin body, low power consumption and no radiation. , and applied to many types of electronic products, such as mobile phones, portable multimedia devices, notebook computers, tablet computers and other displays.

The liquid crystal display device mainly includes a liquid crystal display panel (LCD Panel) and a backlight module module (Backlight Module). Wherein, the liquid crystal display panel has a thin film transistor substrate, a color filter substrate and a liquid crystal layer sandwiched between the two substrates, and the two substrates and the liquid crystal layer can form a plurality of pixels arranged in an array. In addition, the backlight module can emit light through the liquid crystal display panel, and display colors through each pixel of the liquid crystal display panel to form an image.

In the design of display devices, color taste is a very important design factor, and it can be represented by chromaticity coordinates. For example, for a display panel, the light emitted by it can correspond to a CIE 1931 chromaticity In the chromaticity coordinates, the three primary colors (blue, green and red) all have their corresponding color points, which are the three vertices of the chromaticity triangle. At present, the more popular chromaticity specification is sRGB. In the CIE 1931 chromaticity coordinates, the coordinates of the blue color point are (0.15,0.06), the coordinates of the green color point are (0.3,0.6), and the coordinates of the red color point are ( 0.64,0.33). If the color points of the three primary colors deviate too much from the sRGB standard color point coordinates, it means that the color of the image on the display panel may be distorted, resulting in a poor display of the picture, resulting in reduced viewing quality for the user. In addition, a high color gamut means that the display device can display more color ranges, which is also one of the goals actively pursued by major manufacturers.

Therefore, how to provide a display device that can simultaneously have a high color gamut and better display quality to enhance product competitiveness is one of the current important issues.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide a display device with high color gamut and better display quality, which can enhance product competitiveness.

In order to achieve the above object, a display device according to the present invention includes a display panel, which emits a green light when displaying a green picture at the highest grayscale (255 grayscales in terms of 8-bit color scale), and the green light The light has a green energy and a green color point, and the display panel emits a blue light when displaying a blue picture at the highest gray level, and the blue light has a blue energy and a blue color point, green energy and blue energy The ratio is between 0.7 and 1.5. The green color point corresponds to the CIE 1931xy chromaticity coordinates. The green color point coordinate range is between the equation y=-48.85x ² +21.987x–1.7766 and the equation y=-48.85x ² Between +27.849x–3.2717, the y coordinate is between 0.68 and 0.72.

In one embodiment, the ratio of green energy to blue energy is between 0.7 and 1.2.

In one embodiment, the ratio of green energy to blue energy is between 0.75 and 1.1.

In one embodiment, the display panel emits a red light when displaying a red image in the highest grayscale, the red light has a red energy and a red color point, and the ratio of the red energy to the blue energy is between 1.2 and 2.6 , and the red color point corresponds to the CIE 1931xy chromaticity coordinates, the coordinate range of the red color point is between the equation y=-2.021x ² +2.1871x–0.2218 and the equation y=-2.021x ² +2.1871x–0.2618, The x-coordinate is between 0.66 and 0.70.

In one embodiment, the ratio of red energy to blue energy is between 1.2 and 1.7.

In one embodiment, the ratio of red energy to blue energy is between 1.25 and 1.6.

In one embodiment, the blue light color point corresponds to the CIE 1931 xy chromaticity coordinates, and the coordinate range of the blue color point is between the equation y=-168.72x ² +50.312x–3.635 and the equation y=-168.72x ² +63.81 Between x–5.9174, the y coordinate is between 0.04 and 0.08.

In one embodiment, the ratio of green energy to blue energy is between 1.0 and 1.5.

In one embodiment, the ratio of red energy to blue energy is between 2.0 and 2.6.

In one embodiment, the ratio of the red energy to the blue energy of the light is between 2.1 and 2.5.

In one embodiment, the coordinate range of the green color point is between the equation y=-48.85x2 ⁺ 23.452x-2.1174 and the equation y=-48.85x2 ⁺ 26.383x-2.8649, and the y coordinate is further between 0.69 and 0.71 between.

In one embodiment, the coordinate range of the red color point is between the equation y=-2.021x ² +2.1871x-0.2318 and the equation y=-2.021x ² +2.1871x-0.2518, and the x coordinate is further between 0.67 and 0.69 between.

In one embodiment, the coordinate range of the blue color point is between the equation y=-168.72x2 ⁺ 53.687x-4.155 and the equation y=-168.72x2 ⁺ 60.436x-5.2962, and the y coordinate is between 0.05 and 0.07 between.

In one embodiment, the green color point corresponds to the CIE 1976 u'v' chromaticity coordinate, and the u' coordinate range of the green color point is between 0.05 and 0.1, and the v' coordinate is greater than 0.55.

In one embodiment, the red color point corresponds to the CIE 1976 u'v' chromaticity coordinate, and the u' coordinate range of the red color point is between 0.5 and 0.55, and the v' coordinate is greater than 0.5.

In one embodiment, the blue color point corresponds to the CIE 1976 u'v' chromaticity coordinate, and the u' coordinate of the blue color point is between 0.15 and 0.2, and the v' coordinate is between 0.1 and 0.2.

As mentioned above, in the display device of the present invention, the display panel emits a green light when displaying a green picture at the highest grayscale (255 grayscales in terms of 8-bit color scale), and the green light has a green energy With a green color point, the display panel emits a blue light when displaying a blue picture at the highest gray level, the blue light has a blue energy and a blue color point, and the ratio of green energy to blue energy is between 0.7 Between and 1.5, the green color point corresponds to the CIE 1931xy chromaticity coordinates, and the coordinate range of the green color point is between the equation y=-48.85x ² +21.987x–1.7766 and the equation y=-48.85x ² +27.849x–3.2717 Between, the y coordinate is between 0.68 and 0.72. Thereby, the above-mentioned color point range conforms to the tone design close to the sRGB standard, and is substantially the same color tone as the color point of the sRGB standard and extends toward the high color gamut direction, so that the display device of the present invention has a high color gamut and better display quality Can enhance product competitiveness.

Description of drawings

FIG. 1A is a schematic diagram of a display device according to a preferred embodiment of the present invention.

FIG. 1B is a schematic diagram of the display panel of FIG. 1A .

FIG. 2 is a schematic diagram of the intensity spectrum of the light passing through the display panel.

3A is a schematic diagram of a CIE 1931xy chromaticity coordinate corresponding to the light emitted by the display panel of the present invention.

FIG. 3B , FIG. 3C and FIG. 3D are enlarged schematic diagrams of areas O, P, and Q in FIG. 3A , respectively.

FIG. 4 is a schematic diagram of a CIE 1976 u'v' chromaticity coordinate corresponding to the light emitted by the display panel of the present invention.

Figure number:

1: display device

11: Display panel

111: first substrate

112: Second substrate

1121: Color filter layer

113: liquid crystal layer

12: Backlight module

A1～F1, A2～F2: Equations

O, P, Q: area

detailed description

A display device according to a preferred embodiment of the present invention will be described below with reference to related drawings, wherein the same elements will be described with the same reference symbols.

Please refer to FIG. 1A and FIG. 1B , wherein FIG. 1A is a schematic diagram of a display device 1 according to a preferred embodiment of the present invention, and FIG. 1B is a schematic diagram of the display panel 11 in FIG. 1A .

The display device 1 includes a display panel 11 and a backlight module 12 , the display panel 11 and the backlight module 12 are disposed opposite to each other. Here, the display panel 11 is a liquid crystal display panel, which includes a first substrate 111 , a second substrate 112 and a liquid crystal layer 113 . The first substrate 111 is, for example, a thin film transistor substrate, the second substrate 112 is, for example, a color filter substrate, and the liquid crystal layer 113 is sandwiched between the first substrate 111 and the second substrate 112 . Wherein, the first substrate 111 and the second substrate 112 can use glass substrates, transparent acrylic substrates or flexible substrates, or use touch-sensitive substrates. In this embodiment, the second substrate 112 includes a color filter layer 1121 , and the color filter layer 1121 includes a blue filter portion, a green filter portion and a red filter portion (not shown). When the light emitted by the backlight of the backlight module 12 passes through the blue filter part of the color filter layer 1121, it can form the blue energy of the light of the display panel 11, and can be presented by the blue light spectrum of the light; when the backlight module When the light emitted by the backlight of 12 penetrates the green filter part, it can form the green energy of the light of the display panel 11, and can be presented by the green spectrum of the light; when the light emitted by the backlight of the backlight module 12 penetrates When the red filter part is used, it can form the red energy of the light of the display panel 11 and can be represented by the red spectrum of the light. In this embodiment, the color filter layer 1121 is located on the second substrate 112 as an example. In other embodiments, the color filter layer 1121 may be disposed on the first substrate 111 .

Please refer to FIG. 2 , which is a schematic diagram of the intensity spectrum of light passing through the display panel 11 . Here, the intensity on the vertical axis is in arbitrary units.

As shown in FIG. 2 , the intensity spectrum includes a green spectrum, a blue spectrum and a red spectrum. The green light spectrum refers to the spectrum obtained when the display panel 11 only displays a picture with the highest green grayscale (255 grayscales in terms of 8-bit color scale), and the red light spectrum refers to the spectrum obtained when the display panel 11 only displays red and the highest grayscale. blue light spectrum refers to the spectrum obtained when the display panel 11 only displays the highest blue gray level (255 gray in terms of 8-bit color scale). Degrees) of the picture when the resulting frequency spectrum.

Here, the green light has a green energy and a green color point, the green energy is an integral area corresponding to the green light spectrum (ie the area under the curve of the green light spectrum), the red light has a red energy and a red color point, Red energy is an integral area corresponding to the spectrum of red light (that is, the area under the curve of the spectrum of red light), while green light has a green energy and a green color point, and blue energy is an integral area corresponding to the spectrum of blue light (ie, the area under the curve of the blue light spectrum). The area under the curve of the spectrum). Therefore, the calculation method of the blue, green, and red light energies of the display panel 11 is:

Among them, BLU(λ) represents the energy distribution spectrum of the backlight, BCF(λ) represents the transmission spectrum of the blue filter, GCF(λ) represents the transmission spectrum of the green filter, and RCF(λ) represents the transmission spectrum of the red filter. The transmission spectrum of the light part, CELL (λ) represents the transmission spectrum of the liquid crystal panel after the color filter layer (CF) is deducted from the display panel 11, λ is the wavelength, and 380 and 780 refer to the wavelength range for calculating the integral, which is expressed as Nanometer (nm) is the unit, and the unit of integrated blue light, green light and red light energy is light watt. It can be seen from the above that the energy change of each color can be adjusted by changing the backlight BLU (λ), the filter part CF (λ) of each color, or the liquid crystal transmission spectrum CELL (λ) or matching each other through individual design. The white color point specifications that meet the design requirements enable the display device 1 to have better display quality and enhance product competitiveness. Therefore, with the different specifications of the white color point, the color design of RGB will be different, that is, the design of the ratio of RGB color point to energy will also be different. Therefore, the present invention hopes to control the variation of the color point by scientifically adjusting the ratio of RGB energy, so as to achieve the white color point specification required by the design.

Please refer to FIG. 3A , which is a schematic diagram of a CIE 1931xy chromaticity coordinate corresponding to the light emitted by the display panel 11 of the present invention. Among them, the color actually exists on the line and range of the spectral locus of the CIE 1931 chromaticity diagram, that is, the real color (real color). On the contrary, the chromaticity points outside the chromaticity spectral locus do not actually exist , which is the imaginary color.

On the CIE 1931xy chromaticity coordinates, in order to conform to the hue design close to the sRGB specification, the green color point of the sRGB specification is substantially the same hue (hue) and extends toward the high color gamut (that is, along the essence of the sRGB green color point The upper same tone extends outward), so that the display panel 11 has a high color gamut and better display quality. The display device 1 of the present invention is designed to display a green picture at the highest grayscale (for example, 255 grayscale) by the display panel 11. Among the green color light energy measured by the emitted green light, and the blue color light energy of the blue light emitted by the display panel 11 when displaying a blue picture at the highest gray level (for example, 255 gray levels), it is the control of green energy and blue color light energy. If the ratio of color energy is between 0.7 and 1.5, the green color point emitted by the display panel 11 corresponds to the solid color range of CIE 1931xy chromaticity coordinates, and the coordinate range of the green color point is between the equation y=-48.85x ² + 21.987x - 1.7766 (Equation A1 ) and Equation y = -48.85x ² + 27.849x - 3.2717 (Equation B1 ), and the y coordinate is between 0.68 and 0.72. In addition to enabling the display panel 11 to maintain a green tone close to the sRGB specification, this range is closer to the position of the 550nm wavelength on the spectral locus than the green point of NTSC, because the human eye is most sensitive to light with a wavelength of 550nm, so it can Improve the transmittance of the display.

In addition, on the CIE 1931xy chromaticity coordinates, in order to conform to the hue design close to the sRGB specification, the red color point of the sRGB specification is substantially the same as the color point and extends toward the high color gamut (that is, along the substantially red color point of the sRGB The same color tone extends to the outside), so that the display panel 11 has a high color gamut and better display quality. The display device 1 of the present invention is also designed to display the red image emitted by the display panel 11 at the highest grayscale (for example, 255 grayscale). The red color light energy measured by the red light, and the blue color light energy of the blue light emitted by the display panel 11 in the highest grayscale (for example, 255 grayscale) to display the blue picture, are the control of red energy and blue energy. If the ratio is between 1.2 and 2.6, the red color point emitted by the display panel 11 corresponds to the solid color range of the CIE 1931xy chromaticity coordinates, and the red color point coordinate range is between the equation y=-2.021x ² +2.1871 Between x - 0.2218 (Equation C1 ) and the equation y = -2.021x ² +2.1871x - 0.2618 (Equation D1 ), and x is between 0.66 and 0.70. In addition to maintaining the red tone of the display panel 11 close to the sRGB standard, the improvement of color purity makes the color performance more vivid.

In addition, on the CIE 1931xy chromaticity coordinates, in order to conform to the color tone design of the sRGB standard, the display panel 11 has a high color gamut and better display quality with a blue substantive color point close to the sRGB standard. The display device 1 of the present invention is Design, the blue color light energy measured by the blue light emitted by the display panel 11 when displaying a blue picture at the highest grayscale (for example, 255 grayscale), and the blue color point emitted by the display panel 11 corresponds to CIE 1931xy Within the solid color range of the chromaticity coordinates, the coordinate range of the blue color point is between the equation y=-168.72x ² +50.312x–3.635 (equation E1) and the equation y=-168.72x ² +63.81x–5.9174 (equation F1) Between, the y coordinate is between 0.04 and 0.08.

Due to the wide range of display applications, there will be different color point designs for different regions, races, sizes and other factors. Therefore, if the white point of the display is desired to be set at a higher color temperature, on the CIE 1931xy chromaticity coordinates, in order to comply with the color tone design close to the sRGB specification, the green point of the sRGB specification should be substantially the same hue and move toward the high color gamut direction Extending (that is, extending outward along the substantially same tone of the green point of sRGB), the display panel 11 has a high color gamut and better display quality. (For example, 255 grayscale) The green color light energy measured by the green light emitted when displaying a green picture, and the blue color of the blue light emitted by the display panel 11 at the highest grayscale (for example, 255 grayscale) In the color light energy, the ratio of green energy to blue energy is controlled between 0.7 and 1.2, then the green color point emitted by the display panel 11 corresponds to the solid color range of CIE 1931xy chromaticity coordinates, and the green color point coordinates The range is between the equation -48.85x ² +21.987x - 1.7766 (Equation A1 ) and the equation y = -48.85x ² +27.849x - 3.2717 (Equation B1 ), with y between 0.68 and 0.72. Preferably, the ratio of green energy to blue energy is between 0.75 and 1.1, and as shown in the enlarged view of Figure 3B, the coordinate range of the green color point is between the equation y=-48.85x ² +23.452x- Between 2.1174 (Equation A2) and the equation y=-48.85x ² +26.383x–2.8649 (Equation B2), the y coordinate is further between 0.69 and 0.71. In addition to enabling the display panel 11 to maintain a green tone close to the sRGB specification, this range is closer to the position of the 550nm wavelength on the spectral locus than the green point of NTSC, because the human eye is sensitive to light with a wavelength of 550nm (pure green light) The sensitivity is the highest, so the transmittance of the display can be improved.

In addition, on the CIE 1931xy chromaticity coordinates, in order to comply with the hue design close to the sRGB specification, the red point of the sRGB specification is substantially the same hue and extends to the high color gamut direction (that is, along the substantially same color of the red point close to sRGB extended to the outside), so that the display panel 11 has a high color gamut and better display quality. The display device 1 of the present invention is designed to emit red color when the display panel 11 displays a red picture at the highest grayscale (for example, 255 grayscale). The red colored light energy measured by the red light, and the blue colored light energy of the blue light emitted by the display panel 11 at the highest gray scale (for example, 255 gray scale) to display the blue picture are the control of red energy and blue energy. If the ratio is between 1.2 and 1.7, the red color point emitted by the display panel 11 corresponds to the solid color range of the CIE 1931xy chromaticity coordinates, and the red color point coordinate range is between the equation y=-2.021x2 ⁺ 2.1871 Between x-0.2218 (Equation C1 ) and the equation y=-2.021x ² +2.1871x-0.2618 (Equation D1 ), the x-coordinate is between 0.66 and 0.70. Preferably, the ratio of red energy to blue energy is between 1.25 and 1.6, and as shown in the enlarged view of Figure 3C, the coordinate range of the red color point is between the equation y=-2.021x ² +2.1871x- Between 0.2318 (Equation C2) and the equation y=-2.021x ² +2.1871x–0.2518 (Equation D2), the x coordinate is further between 0.67 and 0.69. In addition to maintaining the red tone of the display panel 11 close to the sRGB specification, since the human eye can distinguish the difference of red color more clearly, the color purity improvement of red color compared to NTSC or sRGB makes the color appear more vivid.

In addition, on the CIE 1931xy chromaticity coordinates, in order to conform to the color tone design close to the sRGB specification, the blue color point close to the sRGB specification is substantially the same color point, so that the display panel 11 has a high color gamut and better display quality. The display device 1 is designed to measure the energy of the blue color light emitted by the display panel 11 when displaying a blue picture at the highest gray scale (for example, 255 gray scale), and the blue color point emitted by the display panel 11 In the solid color range corresponding to the CIE 1931xy chromaticity coordinates, the blue color point coordinate range is between the equation y=-168.72x ² +50.312x–3.635 (equation E1) and the equation y=-168.72x ² +63.81x–5.9174 (Equation F1), the x-coordinate is between 0.04 and 0.08. Preferably, as shown in the enlarged view of Figure 3D, the coordinate range of the blue color point is more between the equation y=-168.72x ² +53.687x-4.155 (equation E2) and the equation y=-168.72x ² +60.436x-5.2962 (Equation F2), the y-coordinate is further between 0.05 and 0.07.

In this case, the x-coordinate of the ray corresponding to the white point of the CIE 1931 xy chromaticity coordinates is within 0.28±0.010, and the y-coordinate is within 0.29±0.010. In other words, the white point coordinates of the light corresponding to the CIE 1931xy chromaticity coordinates are (0.28,0.29), and the variation range of the x and y coordinates of the white point is within ±0.010, and the corresponding RGB energy ratios are: 0.7≦ G/B≦1.2 and 1.2≦R/B≦1.7.

In addition, please refer to FIG. 4 , which is a schematic diagram of a CIE1976u'v' chromaticity coordinate corresponding to the light emitted by the display panel 11 of the present invention.

As shown in FIG. 4 , in order to make the color light measured under the condition of the highest grayscale (for example, 255 grayscale) from the light emitted by the display panel 11 have better color uniformity, the present invention will also meet the above energy ratio ( The color points in the range of G/B, R/B) are converted from CIE 1931xy chromaticity coordinates to CIE 1976u'v' chromaticity coordinates. Among them, on the CIE 1976u'v' chromaticity coordinates, in order to conform to the color tone design close to the sRGB specification, the green color point, red color point and blue color point of the sRGB standard are substantially the same color and extend toward the high color gamut direction. To make the display panel 11 have a high color gamut and better display quality, the green light corresponds to the CIE 1976 u'v' chromaticity coordinates, and the u' coordinate range of the green color point is between 0.05 and 0.1, and the v' coordinate is greater than 0.55, the red light corresponds to the CIE 1976 u'v' chromaticity coordinates, and the u' coordinate range of the red color point is between 0.5 and 0.55, the v' coordinate is greater than 0.5, and the blue light corresponds to On the CIE 1976 u'v' chromaticity coordinates, the u' coordinate of the blue color point is between 0.15 and 0.2, and the v' coordinate is between 0.1 and 0.2. From the CIE 1976u'v' chromaticity coordinates, the chromaticity range of red obviously extends to the high color gamut. Since the human eye can distinguish the color difference of red more clearly, so in this design, the color purity of red is improved, which will This makes the color of the display panel more vivid to the human eye, and the quality of the display image is further improved.

Because the color light energy spectrum can be adjusted by designing the transmission spectrum of the filter part CF(λ), it can be adjusted by adjusting the material type of the filter part (such as R254, R177, G7, G36, G58, Y150, Y138, Y139, B15 :6, etc.) and their weight percentages to adjust energy changes. For example, it can be designed that the peak value of the transmission spectrum of the blue filter layer is between 440nm and 460nm, and the peak value of the transmission spectrum of the green filter layer is between 500nm and 550nm, and adjust the green color of the display panel 11 at the highest gray level. The ratio of light energy to blue light energy is between 0.7 and 1.2, and the ratio of red energy to blue energy is between 1.2 and 1.7, so that the green color point coordinates correspond to the range of CIE 1931 chromaticity coordinates Between the equation y=-48.85x ² +21.987x–1.7766 (Equation A1) and the equation y=-48.85x ² +27.849x–3.2717 (Equation B1), and the y coordinate is between 0.68 and 0.72, red color The point coordinate range is between the equation y=-2.021x ² +2.1871x–0.2218 (Equation C1) and the equation y=-2.021x ² +2.1871x–0.2618 (Equation D1), and the x coordinate is between 0.66 and 0.70 between, and the coordinate range of the blue color point is between the equation y=-168.72x ² +50.312x–3.635 (equation E1) and the equation y=-168.72x ² +63.81x–5.9174 (equation F1), and the y coordinate is between Between 0.04 and 0.08. In addition, in accordance with the above energy ratio, green light corresponds to the CIE 1976 u'v' chromaticity coordinates, and the u' coordinate range of the green color point is between 0.05 and 0.1, the v' coordinate is greater than 0.55, and the red light corresponds to On the CIE 1976u'v' chromaticity coordinates, and the u' coordinate range of the red color point is between 0.5 and 0.55, the v' coordinate is greater than 0.5, and the blue light corresponds to the CIE1976u'v' chromaticity coordinates , and the u' coordinate of the blue color point is between 0.15 and 0.2, and the v' coordinate is between 0.1 and 0.2. In this way, the light emitted by the display panel 11 can be substantially in the same color as the sRGB standard, and extend toward a high color gamut, so that the display panel 11 has a high color gamut and better display quality to enhance product competitiveness.

In addition, the energy ratio can also be adjusted by designing the backlight BLU(λ). For example, when the backlight is a blue LED with red and green phosphors, the backlight has a frequency spectrum, and the blue light can be designed by changing the material type of the phosphor or its weight percentage, or changing the current input to the backlight. The peak of the emission spectrum of the green phosphor is approximately between 440nm and 460nm, the peak of the emission spectrum of the green phosphor is approximately between 500nm and 550nm, and the peak of the emission spectrum of the red phosphor is approximately between 600nm and 660nm; or, for example, the backlight is blue When LEDs are paired with yellow phosphors, the peak value of the blue light waveform can be roughly between 440nm and 460nm by changing the type of phosphor material or its weight percentage, or by changing the current input to the backlight. The peak of the frequency spectrum is roughly between 550nm and 580nm, so as to adjust the ratio of green light energy to blue light energy and red light energy to blue light energy at the highest gray level of each color. In addition, the transmission spectrum CELL(λ) of liquid crystal panels with pixels of different colors can also be designed or a combination of the above conditions can be used to adjust the energy ratio. In addition, the energy of the backlight of the backlight module can be adjusted to the above-mentioned range by adjusting the type, composition and ratio of the phosphor powder, so that the display panel 11 has a high color gamut and better display quality to enhance product competitiveness. Wherein, the phosphors may include, for example, sulfide phosphors, nitride phosphors, or silicate phosphors.

In addition, due to the wide range of display applications, there will be different color point designs for different regions, races, sizes and other factors. Therefore, if the white point of the display is to be set at a lower color temperature design, on the CIE 1931xy chromaticity coordinates, in order to meet the color tone design close to the sRGB standard, the green point of the sRGB standard should be substantially the same color and have a higher color gamut direction (i.e. extending outward along the substantially same color tone of the green point of sRGB), so that the display panel 11 has a high color gamut and better display quality. The display device 1 of the present invention is designed so that the display panel 11 has The measured green color light energy of the green light emitted when displaying a green picture with a gray scale of 255 (for example, gray scale 255), and the blue light energy of the blue light emitted by the display panel 11 at the highest gray scale (such as gray scale 255). In the color light energy, the ratio of green energy to blue energy is controlled between 1.0 and 1.5, then the green light emitted by the display panel 11 corresponds to the solid color range of CIE 1931xy chromaticity coordinates, and the green color point coordinates The range is between the equation -48.85x ² +21.987x - 1.7766 (Equation A1 ) and the equation y = -48.85x ² +27.849x - 3.2717 (Equation B1 ), with y between 0.68 and 0.72. Preferably, the ratio of green energy to blue energy is between 1.1 and 1.4, and as shown in the enlarged view of Figure 3B, the coordinate range of the green color point is between the equation y=-48.85x ² +23.452x- Between 2.1174 (Equation A2) and the equation y=-48.85x ² +26.383x–2.8649 (Equation B2), the y coordinate is further between 0.69 and 0.71. In addition to enabling the display panel 11 to maintain a green hue close to the sRGB specification, this range is closer to the position of the 550nm wavelength on the spectral locus than the green point of NTSC, because the human eye is sensitive to light with a wavelength of 550nm (pure green light) The sensitivity is the highest, so the transmittance of the display can be improved.

In addition, on the CIE 1931xy chromaticity coordinates, in order to comply with the hue design close to the sRGB specification, the red point of the sRGB specification is substantially the same hue and extends toward the high color gamut (that is, the red point along the sRGB is substantially the same hue Extending outward), so that the display panel 11 has a high color gamut and better display quality. The display device 1 of the present invention is designed to display the red color emitted by the display panel 11 at the highest grayscale (for example, 255 grayscale). The red color light energy measured by the light, and the blue color light energy of the blue light emitted by the display panel 11 in the highest gray scale (for example, 255 gray scale) to display the blue screen, is to control the ratio of red energy to blue energy Between 2.0 and 2.6, the red light emitted by the display panel 11 corresponds to the solid color range of the CIE 1931xy chromaticity coordinates, and the red color point coordinate range is between the equation y=-2.021x ² +2.1871x- Between 0.2218 (Equation C1 ) and the equation y=-2.021x ² +2.1871x−0.2618 (Equation D1 ), the x coordinate is between 0.66 and 0.70. Preferably, the ratio of red energy to blue energy is between 2.1 and 2.5, and as shown in the enlarged view of Figure 3C, the coordinate range of the red color point is between the equation y=-2.021x ² +2.1871x- Between 0.2318 (Equation C2) and the equation y=-2.021x ² +2.1871x–0.2518 (Equation D2), the x coordinate is further between 0.67 and 0.69. In addition to maintaining the red tone of the display panel 11 close to the sRGB specification, since the human eye can distinguish the difference of red color more clearly, the color purity improvement of red color compared to NTSC or sRGB makes the color appear more vivid.

In addition, on the CIE 1931xy chromaticity coordinates, in order to conform to the color tone design close to the sRGB specification, the blue color point close to the sRGB specification is substantially the same color point, so that the display panel 11 has a high color gamut and better display quality. The display device 1 is designed to measure the blue light energy of the blue light emitted by the display panel 11 when displaying a blue picture at the highest grayscale (for example, 255 grayscale), and the blue light emitted by the display panel 11 In the solid color range corresponding to the CIE 1931xy chromaticity coordinates, the blue color point coordinate range is between the equation y=-168.72x ² +50.312x–3.635 (equation E1) and the equation y=-168.72x ² +63.81x–5.9174 (Equation F1), the y-coordinate is between 0.04 and 0.08. Preferably, as shown in the enlarged view of Figure 3D, the coordinate range of the blue color point is more between the equation y=-168.72x ² +53.687x-4.155 (equation E2) and the equation y=-168.72x ² +60.436x-5.2962 (Equation F2), the y-coordinate is further between 0.05 and 0.07.

In this case, the x-coordinate of the ray corresponding to the white point of the CIE 1931 xy chromaticity coordinates is within 0.313±0.010, and the y-coordinate is within 0.329±0.010. In other words, the white point coordinates of the light corresponding to the CIE 1931xy chromaticity coordinates are (0.313,0.329), and the variation range of the x and y coordinates of the white point is within ±0.010, and the corresponding RGB energy ratios are: 1.0≦ G/B≦1.5 and 2.0≦R/B≦2.6.

In addition, please refer to FIG. 4 again, in order to make the color light measured under the condition of the highest grayscale (for example, 255 grayscale) from the light emitted by the display panel 11 have better color uniformity, the present invention will also meet The color points in the above energy ratio (G/B, R/B) range are converted from CIE 1931xy chromaticity coordinates to CIE 1976u'v' chromaticity coordinates. Among them, on the CIE 1976u'v' chromaticity coordinates, in order to conform to the color tone design close to the sRGB specification, the green color point, red color point and blue color point of the sRGB standard are substantially the same color and extend toward the high color gamut direction. To make the display panel 11 have a high color gamut and better display quality, the green color point corresponds to the CIE 1976 u'v' chromaticity coordinates, and the u' coordinate range of the green color point is between 0.05 and 0.1, and the v' coordinate is greater than 0.55, the red color point corresponds to the CIE 1976 u'v' chromaticity coordinates, and the u' coordinate range of the red color point is between 0.5 and 0.55, the v' coordinate is greater than 0.5, and the blue color point corresponds to On the CIE 1976 u'v' chromaticity coordinates, the u' coordinate of the blue color point is between 0.15 and 0.2, and the v' coordinate is between 0.1 and 0.2. From the CIE 1976u'v' chromaticity coordinates, the chromaticity range of red obviously extends to the high color gamut, because the human eye can distinguish the color difference of red more clearly, so in this design, the color purity of red is improved, which will This makes the color of the display panel more vivid to the human eye, and the quality of the display image is further improved.

Since the energy can be adjusted by designing the transmission spectrum of the filter part CF(λ), it can be adjusted by adjusting the material type of the filter part (such as R254, R177, G7, G36, G58, Y150, Y138, Y139, B15:6 etc.) and their weight percentages to adjust for energy changes. For example, it can be designed that the peak value of the transmission spectrum of the blue filter layer is between 440nm and 460nm, and the peak value of the transmission spectrum of the green filter layer is between 500nm and 550nm, and adjust the green color of the display panel 11 at the highest gray level. The ratio of light energy to blue light energy is between 1.0 and 1.5, and the ratio of red energy to the blue energy is between 2.0 and 2.6, so that the green color point coordinate range is between the equation y= ^-48.85x2 Between +21.987x–1.7766 (Equation A1) and Equation y=-48.85x ² +27.849x–3.2717 (Equation B1), and the y coordinate is between 0.68 and 0.72, and the red color point coordinate range is between Equation y= Between -2.021x ² +2.1871x–0.2218 (Equation C1) and equation y=-2.021x ² +2.1871x–0.2618 (Equation D1), while the x coordinate is between 0.66 and 0.70, and the blue color point coordinate range Between the equation y=−168.72x ² +50.312x−3.635 (Equation E1 ) and the equation y=−168.72x ² +63.81x−5.9174 (Equation F1 ), and the y coordinate is between 0.04 and 0.08. In addition, in accordance with the above energy ratio, green light corresponds to the CIE 1976 u'v' chromaticity coordinates, and the u' coordinate range of the green color point is between 0.05 and 0.1, the v' coordinate is greater than 0.55, and the red light corresponds to On the CIE 1976u'v' chromaticity coordinates, and the u' coordinate range of the red color point is between 0.5 and 0.55, the v' coordinate is greater than 0.5, and the blue light corresponds to the CIE 1976u'v' chromaticity coordinates , and the u' coordinate of the blue color point is between 0.15 and 0.2, and the v' coordinate is between 0.1 and 0.2. In this way, the light emitted by the display panel 11 can be substantially in the same color as the sRGB standard, and extend toward a high color gamut, so that the display panel 11 has a high color gamut and better display quality to enhance product competitiveness.

Because the color light energy spectrum can be adjusted by designing the transmission spectrum of the filter part CF(λ), it can be adjusted by adjusting the material type of the filter part (such as R254, R177, G7, G36, G58, Y150, Y138, Y139, B15 :6, etc.) and their weight percentages to adjust energy changes. For example, it can be designed that the peak value of the transmission spectrum of the blue filter layer is between 440nm and 460nm, and the peak value of the transmission spectrum of the green filter layer is between 500nm and 550nm, and adjust the green color of the display panel 11 at the highest gray level. The ratio of light energy to blue light energy is between 1.0 and 1.5, and the ratio of red energy to the blue energy is between 2.0 and 2.6, so that the u' coordinate of the green color point is between 0.05 and 0.1 , the v' coordinate is greater than 0.55, the u' coordinate of the red color point is between 0.5 and 0.55, the v' coordinate is greater than 0.5, and the u' coordinate of the blue color point is between 0.15 and 0.2, and the v' coordinate is between 0.1 Between and 0.2. In this way, the light emitted by the display panel 11 can be made to have the same color tone as the three-color point of the sRGB standard, and extend toward a high color gamut, so that the display panel 11 has a high color gamut and better display quality, thereby enhancing product competitiveness . In addition, the energy of the backlight of the backlight module can be adjusted to the above-mentioned range by adjusting the type, composition and ratio of the phosphor powder, so that the display panel 11 has a high color gamut and better display quality to enhance product competitiveness.

In addition, the energy ratio can also be adjusted by designing the backlight BLU(λ). For example, when the backlight is a blue LED with red and green phosphors, the backlight has a frequency spectrum, and the blue light can be designed by changing the material type of the phosphor or its weight percentage, or changing the current input to the backlight. The peak of the emission spectrum of the green phosphor is approximately between 440nm and 460nm, the peak of the emission spectrum of the green phosphor is approximately between 500nm and 550nm, and the peak of the emission spectrum of the red phosphor is approximately between 600nm and 660nm; or, for example, the backlight is blue When LEDs are paired with yellow phosphors, the peak value of the blue light waveform can be roughly between 440nm and 460nm by changing the type of phosphor material or its weight percentage, or by changing the current input to the backlight. The peak of the frequency spectrum is roughly between 550nm and 580nm, so as to adjust the ratio of green light energy to blue light energy and red light energy to blue light energy at the highest gray level of each color. In addition, the transmission spectrum CELL(λ) of liquid crystal panels with pixels of different colors can be designed or a combination of the above conditions can be used to adjust the energy ratio. In addition, the energy of the backlight of the backlight module can be adjusted to the above-mentioned range by adjusting the type, composition and ratio of the phosphor powder, so that the display panel 11 has a high color gamut and better display quality to enhance product competitiveness. Wherein, the phosphors may include, for example, sulfide phosphors, nitride phosphors, or silicate phosphors.

In addition, the display panel 11 of the present invention can also use other technologies to have different changes, for example, the color filter layer can be arranged on one side of the thin film transistor array (color filter on array, COA), or the thin film transistor array It is disposed on the color filter substrate (TFT on CF, also known as TOC or array on CF), without limitation.

In summary, in the display device of the present invention, the display panel emits a green light when displaying a green picture at the highest grayscale (255 grayscales in terms of 8-bit color scale), and the green light has a green energy With a green color point, the display panel emits a blue light when displaying a blue picture at the highest gray level, the blue light has a blue energy and a blue color point, and the ratio of green energy to blue energy is between 0.7 Between and 1.5, the green color point corresponds to the CIE 1931xy chromaticity coordinates, and the coordinate range of the green color point is between the equation y=-48.85x ² +21.987x–1.7766 and the equation y=-48.85x ² +27.849x–3.2717 Between, the y coordinate is between 0.68 and 0.72. Thereby, the above-mentioned color point range conforms to the tone design close to the sRGB standard, and is substantially the same color tone as the color point of the sRGB standard and extends toward the high color gamut direction, so that the display device of the present invention has a high color gamut and better display quality Can enhance product competitiveness.

The above descriptions are illustrative only, not restrictive. Any equivalent modification or change without departing from the spirit and scope of the present invention shall be included in the claims.

Claims (10)

1. a kind of display device, it is characterized in that, the display device includes：

One display panel, the display panel launches a red light when highest gray scale shows a red picture, described red Coloured light line has a red color point, and the red color point corresponds in CIE 1931xy chromaticity coordinates, the red color point coordinate Scope is between equation y=-2.021x²+ 2.1871x -0.2218 and equation y=-2.021x²+ 2.1871x -0.2618 it Between, x coordinate is between 0.66 and 0.70.

2. display device as claimed in claim 1, it is characterized in that, the display panel shows a blue picture in highest gray scale When launch a blue ray, the blue ray has a blue energy and a blue color point, and the blue energy corresponds to institute An integral area of a blue light frequency spectrum of light is stated, the blue light frequency spectrum is when the display panel only shows blue light highest gray scale Frequency spectrum obtained by during picture, and the integral area of the blue light frequency spectrum is the area under the blue light spectrum curve, it is described Red light also has a red energy, and the red energy corresponds to an integral area of a feux rouges frequency spectrum of the light, institute Feux rouges frequency spectrum is stated as the frequency spectrum obtained by when the display panel only shows feux rouges highest gray scale picture, and the feux rouges frequency spectrum The integral area is the area under the feux rouges spectrum curve, the red energy and the blue energy ratio be between Between 1.2 and 2.6.

3. display device as claimed in claim 2, it is characterized in that, the red energy and the blue energy ratio more between Between 1.2 and 1.7.

4. display device as claimed in claim 1, it is characterized in that, the display panel shows a green picture in highest gray scale When launch a green light, the green light has a green energy and a green color point, and the green energy corresponds to institute An integral area of a green glow frequency spectrum of light is stated, the green glow frequency spectrum is when the display panel only shows green glow highest gray scale Frequency spectrum obtained by during picture, and the integral area of the green glow frequency spectrum is the area under the green glow spectrum curve, it is described Display panel launches a blue ray when highest gray scale shows a blue picture, and the blue ray has a blue energy Amount, the blue energy correspond to an integral area of a blue light frequency spectrum of the light, and the blue light frequency spectrum is when the display Frequency spectrum obtained by when panel only shows blue light highest gray scale picture, and the integral area of the blue light frequency spectrum is the blue light The ratio of area under spectrum curve, the green energy and blue energy is between 0.7 and 1.5.

5. display device as claimed in claim 4, it is characterized in that, the green energy and the ratio of the blue energy are more situated between Between 0.75 and 1.1.

6. display device as claimed in claim 4, it is characterized in that, the green energy and the ratio of the blue energy are more situated between Between 1.0 and 1.5.

7. display device as claimed in claim 4, it is characterized in that, the green color point corresponds to CIE1931xy chromaticity coordinates On, the coordinate range of the green color point is between equation y=-48.85x²+ 21.987x -1.7766 and equation y=- 48.85x²Between+27.849x -3.2717, y-coordinate is between 0.68 and 0.72.

8. display device as claimed in claim 1, it is characterized in that, the red color point is sat corresponding to CIE 1976u'v' colourities Put on, and the u' coordinate ranges of the red color point are between 0.5 and 0.55, v' coordinates are greater than 0.5.

9. display device as claimed in claim 1, it is characterized in that, the display panel shows a green picture in highest gray scale When launch a green light, the green light has a green color point, and the green color point corresponds to CIE 1976u'v' In chromaticity coordinate, and the u' coordinate ranges of the green color point are between 0.05 and 0.1, and v' coordinates are greater than 0.55.

10. display device as claimed in claim 1, it is characterized in that, the display panel shows that a blueness is drawn in highest gray scale Launch a blue ray during face, the blue ray has a blue color point, and the blue color point corresponds to CIE 1976u' In v' chromaticity coordinates, and the u' coordinates of the blue color point be between 0.15 and 0.2, v' coordinates be between 0.1 and 0.2 it Between.