CN103995391A - Liquid crystal display and manufacturing method thereof - Google Patents

Abstract

The invention provides a liquid crystal display with high color saturation and a manufacturing method thereof. The liquid crystal display includes: a liquid crystal panel having a color filter substrate, an array substrate and a liquid crystal layer between the two substrates; and a backlight module including a first light source for providing a first color light and a second light source for providing a second color light. The color filter substrate comprises a red filter, a green filter and a white filter. Compared with the prior art, the backlight module adopts a double-LED design of the white LED and the blue LED, and the pure blue LED is used as the backlight source when displaying a blue picture, so that the enhancement effect of natural color (nature color) on blue is enhanced, and the requirement of displaying all light colors in the nature, which is emphasized by a wide color gamut high-order product, is met.

Description

A kind of liquid crystal display and its manufacturing method

technical field

The invention relates to liquid crystal display technology, in particular to a liquid crystal display with high color saturation and a manufacturing method thereof.

Background technique

Liquid Crystal Display (LCD), which has superior characteristics such as high image quality, good space utilization efficiency, low power consumption, and no radiation, has gradually become the mainstream of displays. Since the liquid crystal display panel does not have the characteristic of self-illumination, a backlight module must be placed under the liquid crystal display panel to provide the light source required by the liquid crystal display panel. Traditional backlight modules can be roughly divided into two categories, one is a backlight module composed of cold cathode ray tubes (Cold Cathode Fluorescent Lamps, CCFL), while the other is composed of light emitting diodes (Light EmittingDiode, LED) The composed backlight module. Among them, since the LED backlight module can improve the color gamut of the liquid crystal display, most manufacturers now replace the cold-cathode tube backlight module with the LED backlight module.

For the color performance of LCD monitors, the color saturation of the monitor is usually measured by the standards set by the National Television System Committee (NTSC). For example, the NTSC color specification of traditional displays in recent years is about 72%, but this level of color gamut display has gradually been unable to meet the requirements for the presentation and reproduction of true colors. However, the current method for high color saturation displays mainly uses a high color purity backlight with a high color saturation color filter (color filter). However, with the current wide color gamut approach, it is impossible to adjust the color purity of blue LEDs, and it is also impossible to achieve TVUHD REC2020 close to monochromatic light specifications through the combination of color filters.

In view of this, how to design a new liquid crystal display with high color saturation to eliminate the above-mentioned defects or deficiencies, so as to meet the needs of displaying all light colors in nature emphasized by high-end products with wide color gamut, is an important issue in the industry. A problem to be solved urgently by relevant technicians.

Contents of the invention

Aiming at the above-mentioned defects in the liquid crystal display in the prior art when the color saturation is increased, the present invention provides a novel liquid crystal display with high color saturation and a manufacturing method thereof.

According to one aspect of the present invention, a liquid crystal display is provided, comprising:

A liquid crystal panel, comprising:

A color filter substrate, including a red filter, a green filter and a white filter;

an array substrate disposed opposite to the color filter substrate; and

a liquid crystal layer located between the color filter substrate and the array substrate; and

A backlight module includes a first light source for providing a first color light and a second light source for providing a second color light.

In one embodiment, the first light source is a white LED and the first color light is white light, the second light source is a blue LED and the second color light is blue light.

In one embodiment, the backlight module further includes a light guide panel (Light Guide Panel), and the first light source and the second light source are respectively located on opposite sides of the light guide panel.

In one of the embodiments, under the CIE1931 color coordinates, the abscissa x and ordinate y of the blue point position satisfy the relational expression:

y=-1.2845x+0.2199

Wherein, the value range of x is between 0.142 and 0.158.

In one embodiment, when displaying a blue picture, the backlight module only uses the second light source as a backlight.

In one embodiment, the emission spectrum of the backlight module has a relatively maximum brightness peak at a wavelength of 430 nanometers to 480 nanometers.

In one of the embodiments, the liquid crystal display further includes a first polarizer and a second polarizer, the first polarizer is arranged above the color filter substrate, and the second polarizer is arranged under the array substrate.

According to another aspect of the present invention, a method of manufacturing a liquid crystal display is provided, the method of manufacturing comprising the following steps:

forming a color filter substrate, the color filter substrate includes a red filter, a green filter and a white filter;

forming an array substrate, the array substrate is arranged opposite to the color filter substrate;

filling a liquid crystal layer between the color filter substrate and the array substrate; and

A backlight module is formed, including a first light source for providing a first color light and a second light source for providing a second color light.

In one embodiment, the first light source is a white LED and the first color light is white light, the second light source is a blue LED and the second color light is blue light.

In one embodiment, the step of forming the backlight module further includes: arranging a light guide panel (Light Guide Panel); forming the first light source on one side of the light guide panel; and forming the second light source on one side of the light guide panel. On the other side of the light guide plate, the first light source and the second light source are disposed opposite to each other.

Using the liquid crystal display with high color saturation and its manufacturing method of the present invention, its liquid crystal panel includes a color filter substrate, an array substrate and a liquid crystal layer between the two substrates, the color filter substrate includes a red filter The light sheet, a green filter and a white filter, the backlight module includes a white LED for providing a first white light and a blue LED for providing a second blue light. Compared with the prior art, the backlight module of the present invention adopts a double LED design of white LED and blue LED, and uses a simple blue LED as a backlight when displaying a blue picture, thereby enhancing the natural color (nature color) The enhanced effect on blue makes it possible to meet the demand of presenting all light colors in nature emphasized by high-end products with wide color gamut.

Description of drawings

Readers will have a clearer understanding of various aspects of the present invention after reading the detailed description of the present invention with reference to the accompanying drawings. in,

FIG. 1 shows a schematic structural view of a liquid crystal display with high color saturation according to an embodiment of the present invention;

FIG. 2 shows a schematic diagram of the REC2020 characteristic curve when the liquid crystal display in FIG. 1 uses a blue LED as a backlight;

Fig. 3 shows the curve fitting schematic diagram of the abscissa x and the ordinate y of the blue point position under the CIE1931 color coordinates when the liquid crystal display of Fig. 1 is displaying a picture; and

FIG. 4 shows a flow chart of a method for manufacturing a liquid crystal display with high color saturation according to another embodiment of the present invention.

Detailed ways

In order to make the technical content disclosed in this application more detailed and complete, reference may be made to the drawings and the following various specific embodiments of the present invention, and the same symbols in the drawings represent the same or similar components. However, those skilled in the art should understand that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for schematic illustration and are not drawn according to their original scale.

The specific implementation manners of various aspects of the present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic structural diagram of a liquid crystal display with high color saturation according to an embodiment of the present invention. FIG. 2 shows a schematic diagram of the REC2020 characteristic curve when the liquid crystal display in FIG. 1 uses a blue LED as a backlight source. FIG. 3 shows a schematic diagram of curve fitting of the abscissa x and ordinate y of the blue point position under the CIE1931 color coordinates when the liquid crystal display in FIG. 1 is displaying a picture.

Referring to FIG. 1 , in this embodiment, the liquid crystal display with high color saturation of the present invention includes a liquid crystal panel and a backlight module 30 .

Specifically, the liquid crystal panel includes a color filter substrate 102 , a liquid crystal layer LC and an array substrate 202 . Wherein, the color filter substrate includes a red filter R, a green filter G and a white filter W. The red filter R is used to filter other colors and only allow red light to pass through. The green filter G is used to filter other colors and only allow green light to pass through. The array substrate 202 is disposed opposite to the color filter substrate 102 . The liquid crystal layer LC is located between the color filter substrate 102 and the array substrate 202 .

The backlight module 30 includes a first light source 305 for providing a first color light and a second light source 303 for providing a second color light. For example, the first light source 305 is a white LED and the first color light is white light, and the second light source 303 is a blue LED and the second color light is blue light. In a specific embodiment, the backlight module 30 also includes a light guide panel (Light Guide Panel) 301, the backlight module 30 is a side-type backlight module, that is, the first light source 305 and the second light source 303 are respectively located in the guide panel Opposite sides of the light board 301.

In a specific embodiment, when the liquid crystal display displays a blue picture, the backlight module 301 only uses the second light source 303 as a backlight source. Preferably, the emission spectrum of the backlight module 301 has a relatively maximum brightness peak at a wavelength of 430 nm to 480 nm.

In a specific embodiment, the liquid crystal display further includes a first polarizer 104 and a second polarizer 204 . Wherein, the first polarizer 104 is also referred to as an “upper polarizer”, which is disposed above the color filter substrate 102 . The second polarizer 204 is also referred to as a “lower polarizer”, which is disposed below the array substrate 204 .

Referring to FIG. 2, the first curve corresponds to the existing backlight module using only white LEDs (WLEDs), and the second curve corresponds to the dual-LED backlight in which the backlight module of the present invention uses blue LEDs (BLEDs) and white LEDs. source (WLED+BLED). It can be seen from Figure 2 that the white LED REC2020 is 83, and the dual LED backlight design greatly increases the REC2020 to over 90, thereby enhancing the enhancement effect of natural color on blue.

In addition, as shown in Figure 3, when the dual LED backlight of the present invention makes REC2020 greater than 90, the position of the displayed blue point is under the CIE1931 color coordinates, and the curve fitting can be expressed as the following relationship:

y=-1.2845x+0.2199

Wherein, x is the abscissa of the position of the blue point, y is the ordinate of the position of the blue point, and the value range of x is between 0.142 and 0.158.

FIG. 4 shows a flow chart of a method for manufacturing a liquid crystal display with high color saturation according to another embodiment of the present invention.

Referring to Fig. 4 and in conjunction with Fig. 1, in the manufacturing method of this liquid crystal display, at first execute step S11, form a color filter substrate 102, be provided with a red filter R, a green filter R on this color filter substrate 102 Light sheet G and a white filter W. Then in step S13 , an array substrate 202 is formed, and the array substrate 202 is disposed opposite to the color filter substrate 102 . Then step S15 is executed to fill a liquid crystal layer LC between the color filter substrate 102 and the array substrate 202 . Finally, in step S17, a backlight module 30 is formed, and the backlight module 30 includes a first light source 305 for providing a first color light and a second light source 303 for providing a second color light, for example, The first light source 305 is a white LED, and the second light source 303 is a blue LED.

In a specific embodiment, the above-mentioned formation of the backlight module can be realized through the following steps: first, a light guide panel (Light Guide Panel) 301 is provided, then the first light source 305 is formed on one side of the light guide panel 301, and finally the second light source is formed 303 is on the other side of the light guide plate 301, where the first light source 305 and the second light source 303 are oppositely arranged.

Using the liquid crystal display with high color saturation and its manufacturing method of the present invention, its liquid crystal panel includes a color filter substrate, an array substrate and a liquid crystal layer between the two substrates, the color filter substrate includes a red filter The light sheet, a green filter and a white filter, the backlight module includes a white LED for providing a first white light and a blue LED for providing a second blue light. Compared with the prior art, the backlight module of the present invention adopts a double LED design of white LED and blue LED, and uses a simple blue LED as a backlight when displaying a blue picture, thereby enhancing the natural color (nature color) The enhanced effect on blue makes it possible to meet the demand of presenting all light colors in nature emphasized by high-end products with wide color gamut.

Hereinbefore, specific embodiments of the present invention have been described with reference to the accompanying drawings. However, those skilled in the art can understand that without departing from the spirit and scope of the present invention, various changes and substitutions can be made to the specific embodiments of the present invention. These changes and substitutions all fall within the scope defined by the claims of the present invention.

Claims (10)

1. A liquid crystal display, comprising:

a liquid crystal panel, comprising:

a color filter substrate including a red filter, a green filter and a white filter;

an array substrate arranged opposite to the color filter substrate; and

the liquid crystal layer is positioned between the color filter substrate and the array substrate; and

the backlight module comprises a first light source for providing a first color light and a second light source for providing a second color light.

2. The liquid crystal display of claim 1, wherein the first light source is a white LED and the first color light is white light, the second light source is a blue LED and the second color light is blue light.

3. The liquid crystal display of claim 2, wherein the backlight module further comprises a light guide plate, and the first light source and the second light source are respectively located at two opposite sides of the light guide plate.

4. The liquid crystal display of claim 2, wherein the abscissa x and the ordinate y of the position of the blue dot in the CIE1931 chromaticity coordinates satisfy the following relation:

y＝-1.2845x+0.2199

wherein the value range of x is between 0.142 and 0.158.

5. The liquid crystal display of claim 2, wherein the backlight module only uses the second light source as a backlight source when displaying a blue color picture.

6. The liquid crystal display of claim 1, wherein the light emission spectrum of the backlight module has a relatively maximum brightness peak at a wavelength of 430 nm to 480 nm.

7. The liquid crystal display of claim 1, further comprising a first polarizer disposed above the color filter substrate and a second polarizer disposed below the array substrate.

8. A method of manufacturing a liquid crystal display, the method comprising the steps of:

forming a color filter substrate, wherein the color filter substrate comprises a red filter, a green filter and a white filter;

forming an array substrate, wherein the array substrate is arranged opposite to the color filter substrate;

filling a liquid crystal layer between the color filter substrate and the array substrate; and

a backlight module is formed, which comprises a first light source for providing a first color light and a second light source for providing a second color light.

9. The method of manufacturing according to claim 8, wherein the first light source is a white LED and the first color light is white light, the second light source is a blue LED and the second color light is blue light.

10. The method of claim 9, wherein the step of forming the backlight module further comprises:

arranging a light guide plate;

forming the first light source on one side of the light guide plate; and

and forming the second light source on the other side of the light guide plate, wherein the first light source and the second light source are oppositely arranged.