CN104142589A - A liquid crystal panel with anti-glare function - Google Patents

Abstract

The invention provides a liquid crystal panel with an anti-dazzle function, which comprises a color filter substrate, a liquid crystal layer and an array substrate, wherein the liquid crystal layer is positioned between the two substrates. The liquid crystal panel further includes: an upper polarizer located above the color filter substrate; a first anti-glare film formed above the upper polarizing plate; the lower polarizing plate is positioned below the array substrate; and a second antiglare film formed below the lower polarizing plate. The haze of the second antiglare film is greater than the haze of the first antiglare film. Compared with the prior art, the upper polarizing plate and the lower polarizing plate of the liquid crystal panel are respectively matched with the anti-dazzle films with different haze, and the ultra-high-precision anti-dazzle film is attached to the upper polarizing plate and the high-precision anti-dazzle film is attached to the lower polarizing plate, so that the problem of double glare of the existing liquid crystal panel can be effectively solved, and the light penetration rate can be improved.

Description

A liquid crystal panel with anti-glare function

technical field

The invention relates to a liquid crystal display technology, in particular to a liquid crystal panel with an anti-glare function.

Background technique

In the prior art, in order to prevent the glare (sparking) generated by the ambient light source from reaching the surface of the Liquid Crystal Display (LCD), some LCD models will use a matte surface treatment method, that is, set an anti-glare on the surface of the LCD. Glare film (anti-glare film). Here, the glare refers to a phenomenon in which broken bright spots of different colors are randomly distributed on the entire liquid crystal panel with different intensities.

During the manufacturing process, some anti-glare films will roughen the surface by plasma or etching to scatter external light sources, thereby achieving the purpose of anti-glare. However, once the surface roughness is too high, it is easy to reduce the contrast of the picture. In order to improve this defect, the existing anti-glare film is usually mixed with polymer scattering particles, resulting in a certain degree of roughness on the surface. In addition, the substrate and the particles also have a difference in refractive index at the same time, so as to achieve the effect of double scattering.

However, with the continuous improvement of the resolution of liquid crystal panels in recent years, in order to cope with the decrease in the aperture ratio, optical films with brightening effects are often used in the backlight, such as DBEF (Dual Brightness Enhance Film, double-layer brightening membrane). The double-layer brightness enhancement film is a reflective polarizer, which selectively reflects the light of the backlight module so that it is not absorbed by the lower polarizer of the LCD, so that part of the light from the full viewing angle of the LCD can be reused. Generally, DBEF series films include DBEF-M, DBEF-D and DBEF-D200. For example, DBEF-M can prevent optical contact with other materials by coating a diffusion layer, and at the same time, it can reduce the effect of reflection moiré when used with a brightness enhancement film; DBEF-D is a diffusion layer bonded on both sides The sheet can not only increase the strength, but also improve the thermal stability; while the structure of DBEF-D200 is exactly the same as DBEF-D, but its thickness is thinner than DBEF-D, which is 200um. However, the above-mentioned double-layer brightness enhancement film will cause a double sparking issue between the backlight film material and the pixel, and between the pixel and the matte surface treatment (double sparking issue), resulting in a significant decrease in the visual quality of the LCD panel.

In view of this, how to design a liquid crystal panel with an anti-glare function to solve or eliminate the above-mentioned defects in the prior art is an urgent task to be solved by relevant technical personnel in the industry.

Contents of the invention

Aiming at the above defects in the anti-glare design of the liquid crystal panel in the prior art, the present invention provides a novel liquid crystal panel with anti-glare function. For example, the present invention uses a super fine anti-glare film (super fine anti-glare film) and a high-definition anti-glare film (fine anti-glare film) to match each other, so as to solve the problem of existing image quality in response to a high-resolution liquid crystal panel. Good visual problems.

According to one aspect of the present invention, a liquid crystal panel with anti-glare function is provided, comprising a color filter substrate, a liquid crystal layer and an array substrate, the color filter substrate and the array substrate are arranged opposite to each other , the liquid crystal layer is located between the color filter substrate and the array substrate, the liquid crystal panel also includes:

An upper polarizer, located above the color filter substrate;

A first anti-glare film formed above the upper polarizer;

a polarizing plate located below the array substrate; and

A second anti-glare film is formed under the lower polarizer, wherein the haze of the second anti-glare film is greater than that of the first anti-glare film.

In one embodiment, the difference between the haze of the second anti-glare film and the haze of the first anti-glare film is between 20-55.

In one embodiment, the product of the haze of the second anti-glare film and the haze of the first anti-glare film is between 0 and 500.

In one of the embodiments, the haze of the first anti-glare film is less than 10, and satisfies the following relationship:

5.5<G*H<50;

G+H*10<52,

G represents the gloss value when the specular reflection angle of the first anti-glare film is 20 degrees, and H represents the haze value.

In one embodiment, the haze of the first anti-glare film is between 0-5.

In one of the embodiments, the haze of the second anti-glare film is greater than 20, and satisfies the following relationship:

Ra/G<5nm,

Ra represents the surface roughness of the second anti-glare film, and G represents the gloss value when the specular reflection angle of the second anti-glare film is 20 degrees.

In one embodiment, the haze of the second anti-glare film is between 25-60.

In one embodiment, the image resolution of the liquid crystal panel is greater than or equal to 80PPI (Point Per Inch).

Using the liquid crystal panel with anti-glare function of the present invention, the first anti-glare film is formed above the upper polarizer, the second anti-glare film is formed under the lower polarizer, and the haze of the second anti-glare film is greater than that of the first anti-glare film. 1. The haze of the anti-glare film. Compared with the prior art, the present invention combines the upper polarizer and the lower polarizer of the liquid crystal panel with anti-glare films of different hazes, and uses the ultra-high-definition anti-glare film to attach the upper polarizer and the high-definition anti-glare film. Attached to the lower polarizer, it can effectively improve the double glare problem of the existing liquid crystal panel, and can also improve the light transmittance.

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 (a) and Fig. 1 (b) respectively show the antiglare structure schematic diagram of the liquid crystal panel in the prior art;

Fig. 2 shows a schematic diagram of the state of double glare after a high-resolution liquid crystal panel in the prior art adopts double brightness enhancement films; and

FIG. 3 shows a schematic structural diagram of a liquid crystal panel with an anti-glare function according to an 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( a ) and FIG. 1( b ) respectively show the schematic diagrams of the anti-glare structure of the liquid crystal panel in the prior art.

Referring to FIG. 1( a ), the prior art liquid crystal panel includes a color filter substrate 100 , a liquid crystal layer 102 and an array substrate 104 . Wherein, the color filter substrate 100 and the array substrate 104 are disposed opposite to each other. The liquid crystal layer 102 is located between the color filter substrate 100 and the array substrate 104 . In addition, the upper polarizer 106 is formed above the color filter substrate 100 , and the lower polarizer 108 is formed below the array substrate 104 .

As mentioned above, in order to prevent the glare (sparking) produced by the ambient light source reaching the surface of the liquid crystal display, some liquid crystal display models will use a matte surface treatment method, that is, an anti-glare film (anti-glare film) is provided on the surface of the upper polarizer 106. Glare film) 110, through the anti-glare film 110 to successfully prevent the glare caused by the interference of external light sources. In addition, in order to improve the anti-glare performance, a fine anti-glare film (fine anti-glare film) 110' can also be attached to the surface of the upper polarizer 106, as shown in FIG. 1(b).

In addition, with the continuous improvement of the resolution of liquid crystal panels in recent years, in order to cope with the decrease of the aperture ratio, an optical film with a brightening effect is often used in the backlight, such as DBEF (Dual Brightness Enhance Film, double-layer brightening film) 200. The double-layer brightness enhancement film is disposed on the backlight film material 202 .

FIG. 2 is a schematic diagram showing the state of double glare after the high-resolution liquid crystal panel in the prior art adopts double brightness enhancement films.

Referring to FIG. 2 , when a double-layer brightness enhancement film is used, the double-layer brightness enhancement film will cause a gap between the backlight film 300 and the pixel (such as sub-pixel R, sub-pixel G, and sub-pixel B) 302 (as shown by the interface S1) , and a double sparking issue occurs between the pixel 302 and the matte surface treatment (that is, the anti-glare film 304 ) (as shown in the interface S2 ), resulting in a significant decrease in the visual quality of the liquid crystal panel.

FIG. 3 shows a schematic structural diagram of a liquid crystal panel with an anti-glare function according to an embodiment of the present invention.

Referring to FIG. 3 , in an exemplary embodiment of the present invention, the liquid crystal panel includes a first anti-glare film 112 and a second anti-glare film 114 . Those skilled in the art should understand that other structural layers of the liquid crystal panel are basically the same or similar to those in FIG. 1( a ) and FIG. 1( b ), and will not be repeated here for simplicity.

Specifically, the first anti-glare film 112 is formed above the upper polarizer 106 . The second anti-glare film 114 is formed under the lower polarizer 108 . Moreover, the haze of the second anti-glare film 114 is greater than that of the first anti-glare film 112 . For example, the first anti-glare film 112 is an ultra-high-definition anti-glare film, and the second anti-glare film 114 is a high-definition anti-glare film. It can be seen that in the present invention, the upper polarizer and the lower polarizer of the liquid crystal panel are respectively matched with anti-glare films of different hazes, and the ultra-high-definition anti-glare film is attached to the upper polarizer and the high-definition anti-glare film is attached to the lower polarizer. The polarizing plate can effectively improve the double glare problem of the existing liquid crystal panel, and can also improve the light transmittance.

Table 1 is a schematic diagram of the comparison between various types of ultra-high-definition anti-glare films and various types of high-definition anti-glare films. In Table 1, the total haze values of ultra-high-definition anti-glare films A~E are all between 0-5, while the total haze values of high-definition anti-glare films 1-5 are all between 25-60. In addition, the haze value of any ultra-high-definition anti-glare film is smaller than that of any high-definition anti-glare film.

Table 1

In a specific embodiment, the image resolution of the liquid crystal panel is greater than or equal to 80 PPI (Point Per Inch). In other words, the present invention attaches ultra-high-definition anti-glare films with different hazes to the upper polarizer and attaches high-definition anti-glare films to the lower polarizer. When applied to liquid crystal panels with high image resolution, the anti-glare effect is even better. good.

In a specific embodiment, the product of the haze of the second anti-glare film 114 and the haze of the first anti-glare film 112 is between 0-500. Table 2 is a data comparison table of the gloss value and the total haze value of various types of anti-glare films. Among them, anti-glare films A, B, C, D and E are ultra-high-definition anti-glare films, as shown in Table 2 shown in bold.

Table 2

Anti-glare film name Gloss value (G) Total haze value (H) G*H G+H*10 A 21.9 0.3 6.57 24.9 B 14 2.3 32.2 37 C 33.4 0.2 6.68 35.4 D. 25 0.4 10 29 E. 36.5 1.3 47.45 49.5 1 22.7 0.1 2.27 23.7 2 twenty one 0.1 2.1 twenty two 3 25.1 0.2 5.02 27.1 4 35.8 2.8 100.24 63.8 5 48 1.4 67.2 62 6 40.2 1.9 76.38 59.2 7 36 1.8 64.8 54 8 79.2 1 79.2 89.2 9 42.2 1.2 50.64 54.2

It can be seen from Table 2 that the haze of the first anti-glare film 112 is less than 10 and satisfies the following relational expressions: 5.5<G*H<50 and G+H*10<52. G represents the gloss value when the specular reflection angle of the first anti-glare film 112 is 20 degrees, and H represents the haze value. In addition, it can also be seen from Table 2 that the G*H to product of other anti-glare films other than ultra-high-definition anti-glare films is either less than 5.5 (such as 2.27, 2.1 or 5.02), or greater than 50 (such as 50.64, 67.2 or 100.24 etc.).

In a specific embodiment, the haze of the second anti-glare film 114 is greater than 20 and satisfies the following relationship: Ra/G<5nm, where Ra represents the surface roughness of the second anti-glare film 114, and G represents the second anti-glare film 114. Gloss value for film 114 at a specular angle of 20 degrees. Table 3 is a data comparison table of surface roughness and gloss value of various types of anti-glare films, in which AGS1 is a common anti-glare film, and AG150 and AG200 are high-definition anti-glare films. It can be seen from the above that the anti-glare effect of ordinary anti-glare film is poor, and the anti-glare effect of high-definition anti-glare film is better.

table 3

Anti-glare film name Surface Roughness (Ra) Gloss value (G) Ra/G AGS1 47.37nm 4.3 11.02 AG150 36.83nm 11.13 3.31 AG200 23.26nm 24.23 0.96

As can be seen from Table 3, AGS1 is an ordinary anti-glare film, the surface roughness Ra is 47.37 nanometers (nm), and its corresponding Ra/G is 11.02 nm, which is higher than 5 nm, so it does not meet the requirements of the second anti-glare film 114. condition. The surface roughness Ra of AG150 is 36.83 nanometers (nm), and its corresponding Ra/G is 3.31 nm, which is lower than 5 nm, and can be used as the second anti-glare film 114 .

In a specific embodiment, the difference between the haze of the second anti-glare film 114 and the haze of the first anti-glare film 112 is between 20-55. Table 4 is a data comparison table of the haze on the side of the color filter substrate, the haze on the side of the array substrate, the total haze and the anti-glare evaluation results after various types of anti-glare films are combined.

Table 4

sample number Anti-glare film matching type CF side haze TFT side haze total haze value evaluation result 1 HLAG6+AG150 1 40 39 Y 2 HLAG6+AG470 1 25 twenty four Y 3 HLAG6+AG200 1 50 49 Y 4 AG150 40 - -40 N 5 AG480 2 - -2 N 6 AGSR6+AGSR6 10 10 0 N 7 AGS1+AG480 25 2 -twenty three N 8 AGS1+AG150 25 40 15 N 9 AGSR6+AG470 10 25 15 N

It can be seen from Table 4 that when the color filter (CF) side is equipped with a low-haze ultra-fine anti-glare film and the TFT side is equipped with a high-haze high-definition anti-glare film, and the haze difference between the two satisfies In a certain range, the double glare problem of the liquid crystal panel can be eliminated. For example, the anti-glare film matching type of sampling numbers 1 to 3 is that the CF side adopts ultra-high-definition anti-glare film, and the TFT side adopts high-definition anti-glare film. The minimum total haze value is 24 and the maximum is 40. The setting range of the difference (for example, between 20 and 55), so the evaluation result is Y, which can avoid double glare. For the type of anti-glare film combination with sampling numbers 4-5, only the anti-glare film is provided on the CF side, but there is no anti-glare film on the TFT side, and the total haze value is correspondingly negative. For the type of anti-glare film combination with sampling number 7, the haze value of the anti-glare film on the CF side is higher than that on the TFT side, so the double glare problem of the LCD panel cannot be eliminated.

Using the liquid crystal panel with anti-glare function of the present invention, the first anti-glare film is formed above the upper polarizer, the second anti-glare film is formed under the lower polarizer, and the haze of the second anti-glare film is greater than that of the first anti-glare film. 1. The haze of the anti-glare film. Compared with the prior art, the present invention combines the upper polarizer and the lower polarizer of the liquid crystal panel with anti-glare films of different hazes, and uses the ultra-high-definition anti-glare film to attach the upper polarizer and the high-definition anti-glare film. Attached to the lower polarizer, it can effectively improve the double glare problem of the existing liquid crystal panel, and can also improve the light transmittance.

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 (8)

1. A liquid crystal panel with an anti-dazzle function comprises a color filter substrate, a liquid crystal layer and an array substrate, wherein the color filter substrate and the array substrate are arranged opposite to each other, and the liquid crystal layer is positioned between the color filter substrate and the array substrate, and the liquid crystal panel is characterized by further comprising:

an upper polarizer located above the color filter substrate;

a first anti-dazzle film formed above the upper polarizer;

a lower polarizer located below the array substrate; and

a second anti-glare film formed below the lower polarizing plate,

wherein the second antiglare film has a haze greater than the haze of the first antiglare film.

2. The liquid crystal panel with an antiglare function according to claim 1, wherein the difference between the haze of the second antiglare film and the haze of the first antiglare film is from 20 to 55.

3. The liquid crystal panel with an antiglare function according to claim 1, wherein a product of the haze of the second antiglare film and the haze of the first antiglare film is between 0 and 500.

4. The liquid crystal panel with an antiglare function according to claim 1, wherein the first antiglare film has a haze of less than 10 and satisfies the following relational expression:

5.5<G*H<50；

G+H*10<52，

wherein G represents a gloss value when the specular reflection angle of the first antiglare film is 20 degrees, and H represents a haze value.

5. The liquid crystal panel with an antiglare function of claim 4, wherein the first antiglare film has a haze of 0 to 5.

6. The liquid crystal panel with an antiglare function according to claim 1, wherein the second antiglare film has a haze of more than 20 and satisfies the following relational expression:

Ra/G<5nm，

wherein Ra represents the surface roughness of the second antiglare film, and G represents the gloss value at a specular reflection angle of 20 degrees of the second antiglare film.

7. The liquid crystal panel with an antiglare function of claim 6, wherein the second antiglare film has a haze of 25 to 60.

8. The liquid crystal panel with an antiglare function of claim 1, wherein an image resolution of the liquid crystal panel is greater than or equal to 80 PPI.