CN101140392A - Liquid crystal display device with a light guide plate - Google Patents

Abstract

The invention relates to a liquid crystal display, which comprises a color filter substrate, a plurality of color filter patterns and a double-layer electrode structure, wherein the color filter patterns are arranged on the color filter substrate; the double-layer electrode structure comprises a first electrode layer and a second electrode layer; the material of the first electrode layer comprises indium tin oxide, zinc aluminum oxide or gallium zinc oxide, while the material of the second electrode layer comprises indium tin oxide, zinc aluminum oxide or gallium zinc oxide, and the material of the first electrode layer is different from the material of the second electrode layer. The liquid crystal display of the invention utilizes a double-layer electrode structure or a single-layer electrode structure using zinc-aluminum oxide, and has the advantages of improving color cast, improving blue light penetration rate, increasing color temperature and color gamut, and the like.

Description

LCD Monitor

technical field

The invention relates to a liquid crystal display, in particular to a liquid crystal display with improved color shift.

Background technique

Liquid crystal displays are widely used in information products such as notebook computers (notebooks), personal computer monitors, and personal digital assistants (PDAs) due to their thin and light appearance, low power consumption, and no radiation pollution. , and has gradually replaced the traditional cathode ray tube TV, becoming the mainstream of home TV products.

Since the liquid crystal display itself has no self-luminous characteristics, it must use the light source provided by the backlight module to display the picture. At present, the backlight module mainly uses cold cathode fluorescent lamps or light-emitting diodes to generate white light, and then uses the color filter on the liquid crystal display panel to generate white light. light sheet to display a color picture. However, whether it is a cold cathode fluorescent tube or a light emitting diode, the white light source produced by it has inherent limitations, thus affecting the color performance of the liquid crystal display.

Please refer to Figure 1. FIG. 1 shows the spectrum of the light source of the conventional cold-cathode fluorescent lamp and the filtering characteristics of the color filter. As shown in Figure 1, the relationship between the intensity of the cold cathode fluorescent tube light source and the wavelength is shown in curve C, while the relationship between the transmittance of the red filter, green filter and blue filter and the wavelength is They are shown as curve R, curve G and curve B respectively. It can be seen from the figure that the intensity of the cold cathode fluorescent tube light source itself in the blue and red wavelength range is weaker than that in the green wavelength range, and this characteristic makes the liquid crystal display have a color gamut that is not wide enough and easy to display. There are sub-peak problems and poor red light performance.

Please refer to Figure 2. FIG. 2 shows the spectrum of the conventional LED light source and the filtering characteristics of the color filter. As shown in Figure 2, the relationship between the intensity of the LED light source and the wavelength is shown in the curve L, while the relationship between the transmittance of the red filter, the green filter and the blue filter and the wavelength is shown in the curve R , curve G and curve B shown. It can be seen from the figure that the peak position of the blue light provided by the LED light source falls within the wavelength range of 450nm to 480nm, but the ideal peak position of the blue light should be within the wavelength range of approximately 420nm to 450nm. The sensitivity of color is that green light is greater than red light than blue light, so using light-emitting diodes as light sources will cause color shift problems.

Contents of the invention

The main purpose of the present invention is to provide a liquid crystal display to improve the color performance of the liquid crystal display.

To achieve the above purpose, the present invention provides a liquid crystal display. The liquid crystal display above includes an array substrate, a color filter substrate, a plurality of color filter patterns arranged on the color filter substrate, and a double-layer electrode structure arranged on the color filter patterns and a liquid crystal layer located between the array substrate and the color filter substrate. The double-layer electrode structure includes a first electrode layer disposed on the surface of the color filter patterns, and a second electrode layer disposed on the surface of the first electrode layer. The material of the first electrode layer includes indium tin oxide, zinc aluminum oxide or gallium zinc oxide, and the material of the second electrode layer includes indium tin oxide, zinc aluminum oxide or gallium zinc oxide , and the materials of the first electrode layer and the second electrode layer are different.

To achieve the above purpose, the present invention further provides a liquid crystal display. The liquid crystal display above includes an array substrate, a color filter substrate, a plurality of color filter patterns arranged on the color filter substrate, a liquid crystal layer located on the array substrate and the color filter Between the substrates, and an electrode structure is disposed on the color filter patterns, wherein the material of the electrode structure includes zinc aluminum oxide.

The liquid crystal display of the present invention utilizes a double-layer electrode structure or a single-layer electrode structure of zinc-aluminum oxide, which has the advantages of improving color shift, increasing blue light transmittance, increasing color temperature and color gamut, and the like.

Description of drawings

FIG. 1 shows the spectrum of the light source of the conventional cold-cathode fluorescent lamp and the filtering characteristics of the color filter.

FIG. 2 shows the spectrum of the conventional LED light source and the filtering characteristics of the color filter.

FIG. 3 is a schematic diagram of a liquid crystal display according to a preferred embodiment of the present invention.

FIG. 4 is a graph showing the relationship between the transmittance of the electrode material and the wavelength.

Figure 5 shows the color simulation results for different electrode materials.

FIG. 6 is a schematic diagram of a liquid crystal display according to another preferred embodiment of the present invention.

Reference number

1 LCD display 2 Backlight module

10 Array substrate 12 Liquid crystal layer

20 Color filter substrate 22 Color filter pattern

22R Red Filter 22G Green Filter

22B blue filter 24 black matrix pattern

26 Double layer electrode structure 28 First electrode layer

30 Second electrode layer 32 Alignment layer

50 LCD display 52 Backlight module

60 Array substrate 62 Liquid crystal layer

70 Color filter substrate 72 Color filter pattern

72R Red Filter 72G Green Filter

72B Blue Filter 74 Black Matrix Pattern

76 electrode structure

Detailed ways

Please refer to Figure 3. FIG. 3 is a schematic diagram of a liquid crystal display according to a preferred embodiment of the present invention. As shown in Figure 3, the liquid crystal display 1 of this embodiment is arranged on a backlight module 2, wherein the backlight module 2 is used to provide the light source required by the liquid crystal display 1, which can be a fluorescent tube backlight module, such as a cold CFL backlight modules, LED backlight modules, such as white LED backlight modules, or other types of backlight modules. The liquid crystal display 1 includes an array substrate 10, a color filter substrate 20, and a plurality of color filter patterns 22 (including, for example, a red filter 22R, a green filter 22G, and a blue filter 22B) arranged in color On an inner surface of the filter substrate 20, a plurality of black matrix patterns 24 are arranged on the color filter substrate 20 between the color filter patterns 22, and a double-layer electrode structure 26 is arranged on the color filter patterns 22 and a liquid crystal layer 12 located between the array substrate 10 and the color filter substrate 20 . The double-layer electrode structure 26 includes a first electrode layer 28 , for example, disposed on or on the surface of the color filter pattern 22 , and a second electrode layer 30 disposed on the surface of the first electrode layer 28 . In another example, a flat layer (not shown) may be provided on or on the surface of the color filter pattern 22, and then the first electrode layer 28 is disposed on the flat layer, that is, the color filter pattern A flat layer is interposed between 22 and the first electrode layer 28 . In addition, an alignment layer 32 is further disposed on the second electrode layer 30 . The material of the first electrode layer 28 is a transparent conductive material, which includes indium tin oxide (ITO), zinc aluminum oxide (ZAO) or gallium zinc oxide (GZO), while the material of the second electrode layer 30 is transparent conductive The material includes indium tin oxide, zinc aluminum oxide or gallium zinc oxide, but the first electrode layer 28 and the second electrode layer 30 use different materials and form a double-layer structure. In this embodiment, the material of the first electrode layer 28 is zinc aluminum oxide, and the material of the second electrode layer 30 is indium tin oxide, but it is not limited thereto. On the premise of using different materials, the second The material of the first electrode layer 28 can also be indium tin oxide or gallium zinc oxide, and the material of the second electrode layer 30 can also be zinc aluminum oxide or gallium zinc oxide. In this embodiment, the thicknesses of the first electrode layer 28 and the second electrode layer 30 are respectively about 600 Ȧ to 900 Ȧ, preferably 650 Ȧ to 850 Ȧ, for example, the thickness of the first electrode layer 28 and the second electrode layer The thicknesses of the two electrode layers 30 are about 750 Ȧ. In addition, in this embodiment, the thicknesses of the first electrode layer 28 and the second electrode layer 30 are about the same, but not limited thereto and can be appropriately adjusted.

Please refer to Figure 4. FIG. 4 is a graph showing the relationship between the transmittance of the electrode material and the wavelength. In Figure 4, the relationship between five groups of electrode materials and transmittance is shown, which are:

First group:

Material: zinc aluminum oxide monolayer film; thickness: 1500 Ȧ;

Second Group:

Material: zinc aluminum oxide/indium tin oxide double layer film; thickness: 750 Ȧ/100 Ȧ;

The third group:

Material: zinc aluminum oxide/indium tin oxide double layer film; thickness: 750 Ȧ/750 Ȧ;

Fourth group:

Material: indium tin oxide monolayer film; thickness: 1500 Ȧ;

Fifth group:

Material: indium tin oxide monolayer film; thickness: 750 Ȧ.

As can be seen from Figure 4, the electrode materials of the second group (material: zinc aluminum oxide/indium tin oxide double-layer film; thickness: 750 Ȧ/100 Ȧ) and the fifth group (material: indium tin oxide single-layer film; thickness : 750 Ȧ) the transmittance of the electrode material in the blue light wavelength range is obviously low (about 85%-90%), while the first group (material: zinc aluminum oxide monolayer film; thickness: 1500 Ȧ) The electrode material and the fourth group (material: indium tin oxide monolayer film; thickness: 1500 Ȧ) the electrode material has a higher transmittance in the blue light wavelength range, but its blue light peak position falls in the wavelength range of 515nm to 530nm Instead of falling within the ideal blue light wavelength range of 420nm to 450nm, it cannot increase the intensity of blue light. Compared with the electrode materials of the first group and the fourth group, the blue light peak position of the electrode materials of the third group (material: zinc aluminum oxide/indium tin oxide double-layer film with a thickness of 750/750 Ȧ) shifted to about 450nm to 480nm, and the transmittance in the ideal blue light wavelength range (about 420nm to 450nm) also has a significant improvement (about 97%-99%), so it can be part of the green light wavelength range The transmittance is shifted to the blue light wavelength range, which helps to increase the brightness of blue light and can improve the overall color performance of the liquid crystal display.

Please refer to Figure 5 again. Figure 5 shows the color simulation results of different electrode materials, including a control group and an experimental group, respectively:

Control group:

Material: indium tin oxide monolayer film; thickness: 1500 Ȧ;

test group:

Material: zinc aluminum oxide/indium tin oxide double layer film; thickness: 750 Ȧ/750 Ȧ.

As shown in Figure 5, using light-emitting diodes as the simulation results of the light source, the y-color coordinates of the blue light in the experimental group (material: zinc aluminum oxide/indium tin oxide double-layer film; thickness: 750 Ȧ/750 Ȧ) are significantly reduced (from 0.129 to 0.123), and the simulation results using cold-cathode fluorescent tubes as light sources, the y-color coordinates of the blue light in the experimental group also decreased significantly (from 0.136 to 0.130). In addition, the color temperature of the experimental group increased from 6582K to 7063K in the simulation results using light-emitting diodes as the light source, and the color temperature of the experimental group also increased from 6812K to 7327K in the simulation results using cold-cathode fluorescent tubes as the light source. From the above simulation results, it can be seen that the use of zinc aluminum oxide/indium tin oxide double-layer electrode materials can increase the color temperature and increase the chromaticity of blue light, which can improve the overall color performance of the liquid crystal display without affecting the green color. light chroma. It is also worth noting that if the specifications of the liquid crystal display itself do not require higher blue light chromaticity, the increased blue light brightness through the electrode material can be offset by reducing the thickness of the blue filter. Under the excellent color performance, the transmittance and brightness performance of the liquid crystal display can be further increased.

Please refer to Figure 6. FIG. 6 is a schematic diagram of a liquid crystal display according to another preferred embodiment of the present invention. As shown in Figure 6, the liquid crystal display 50 of this embodiment is arranged on a backlight module 52, wherein the backlight module 52 is used to provide the light source required by the liquid crystal display 50, which can be a fluorescent tube backlight module, a light emitting diode A backlight module, or other types of backlight modules. The liquid crystal display 50 includes an array substrate 60, a color filter substrate 70, and a plurality of color filter patterns 72 (including, for example, a red filter 72R, a green filter 72G, and a blue filter 72B) arranged in color The inner surface of the filter substrate 70, a plurality of black matrix patterns 74 are arranged on the color filter substrate 70 between the color filter patterns 72, an electrode structure 76 is arranged on the color filter patterns 72, and an alignment Layer 78 is disposed on electrode structure 76 , and a liquid crystal layer 62 is located between array substrate 60 and color filter substrate 70 . The difference from the previous embodiments is that the electrode structure 76 of this embodiment is a single-layer structure, and its material includes zinc aluminum oxide, and its thickness is 1200 Ȧ±300 Ȧ. Using ZnAlO as the electrode structure 76 also has the advantage of increasing blue light transmittance compared to the existing single-layer ITO electrode structure, which can improve the color performance of the liquid crystal display.

In summary, the liquid crystal display of the present invention uses a double-layer electrode structure or a single-layer electrode structure of zinc-aluminum oxide, which can improve the problem of color shift, increase the blue light transmittance, and increase the color temperature and color gamut. Etc.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (10)

1. a LCD is characterized in that, described LCD comprises:

Array basal plate;

One colored filter substrate;

A plurality of color filter patterns are arranged on the described colored filter substrate; And

The pair of lamina electrode structure is arranged on described these color filter patterns, and described two-layer electrode structure comprises:

One first electrode layer is arranged at the surface of described these color filter patterns, and the material of described first electrode layer comprises indium tin oxide, Zinc-aluminium or gallium zinc oxide; And

One the second electrode lay is arranged at the surface of described first electrode layer, and the material of described the second electrode lay comprises indium tin oxide, Zinc-aluminium or gallium zinc oxide, and described first electrode layer is different with the material of described the second electrode lay; And

One liquid crystal layer is between described array base palte and described colored filter substrate.

2. LCD as claimed in claim 1, the material of wherein said first electrode layer are Zinc-aluminium or gallium zinc oxide, and the material of described the second electrode lay is an indium tin oxide.

3. LCD as claimed in claim 1, wherein said LCD includes a backlight module in addition, is arranged at the below of described array base palte.

4. LCD as claimed in claim 3, wherein said backlight module are a fluorescent lamp backlight module.

5. LCD as claimed in claim 3, wherein said backlight module are a light-emitting diode (LED) backlight module.

6. LCD as claimed in claim 5, wherein said light-emitting diode (LED) backlight module are a white light-emitting diode backlight module.

7. LCD as claimed in claim 1, the thickness of wherein said first electrode layer and described the second electrode lay are about 600  to 900 .

8. LCD as claimed in claim 1, the thickness of wherein said first electrode layer and described the second electrode lay are about 650  to 850 .

9. LCD as claimed in claim 1, the thickness of wherein said first electrode layer and described the second electrode lay is approximately identical.

10. LCD as claimed in claim 9, the thickness of wherein said first electrode layer and described the second electrode lay is about 750 .

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