CN104730755A - Curved liquid crystal display panel and manufacturing method thereof - Google Patents

Abstract

The invention provides a curved liquid crystal display panel and a manufacturing method thereof. The panel includes: a first substrate including a color filter layer having a red photoresist, a green photoresist and a first blue photoresist alternately disposed; a second substrate including a black matrix disposed opposite to the gap between the adjacent light resistors of different colors; and a liquid crystal layer disposed between the first substrate and the second substrate. The first substrate further comprises a second blue photoresist filled at the junction of the red photoresist and the green photoresist. Compared with the prior art, the invention fills the blue photoresist at the junction of the red photoresist and the green photoresist, and realizes better light shielding effect by virtue of the optical characteristic of lower blue photoresist penetration rate. In addition, the blue light resistance can increase the light shielding angle of the first substrate, reduce the side light leakage from the backlight module under the condition of not increasing the line width of the black matrix of the second substrate, and improve the display quality of the product.

Description

Curved liquid crystal display panel and manufacturing method thereof

technical field

The invention relates to a liquid crystal display panel, in particular to a curved liquid crystal display panel capable of reducing light leakage and a manufacturing method thereof.

Background technique

In recent years, flat panel display technology has gradually developed towards high-end and diversified, such as high-resolution (4K, 8K), stereoscopic display (Stereoscopic Display) and flexible display (Flexible Display), etc. Among them, although flexible displays have been developed for many years, there is no obvious market application due to the limitations of material development, related process technology development and optical performance. In addition to its traces found in portable electronic products, its application in large-size displays has gradually surfaced. Although there is still room for improvement in the market penetration rate, the relevant patent layout has already been launched among various manufacturers.

In the prior art, a traditional liquid crystal panel mainly includes a color filter substrate (ColorFilter Substrate), a thin film transistor array substrate (Thin Film Transistor Array Substrate) and a liquid crystal layer (Liquid Crystal Layer) arranged between the two substrates, which The working principle is to control the rotation of the liquid crystal molecules in the liquid crystal layer by applying a driving voltage to the respective electrodes of the two substrates, so as to refract the light from the backlight module to produce a picture. Directly bending a traditional liquid crystal panel to achieve a curved display will often produce many optical defects, which will result in a decrease in panel resolution, color shift, and uneven brightness (Mura). A common defect is that the light-shielding layer of the upper substrate has a relative displacement (for example, the maximum displacement can reach 25 microns) after the panel is bent, so that when the overlap of adjacent photoresists is poorly matched and cannot be covered by process parameters, it will There are bulges or depressions at the junction, and this shape tends to easily cause lateral light leakage of the curved liquid crystal panel.

In view of this, how to design a novel curved liquid crystal display panel or improve the existing panel to solve or eliminate the existing above-mentioned defects is a problem to be solved urgently by relevant technical personnel in the industry.

Contents of the invention

Aiming at the above defects of the curved liquid crystal display panel in the prior art, the present invention provides a novel curved liquid crystal display panel which can effectively reduce light leakage and a manufacturing method thereof.

According to one aspect of the present invention, a curved liquid crystal display panel capable of reducing lateral light leakage is provided, including:

A first substrate, including a color filter layer, the color filter layer has a red photoresist, a green photoresist and a first blue photoresist arranged at intervals;

A second substrate, arranged opposite to the first substrate, the second substrate includes a black matrix, facing the gap between adjacent photoresists of different colors; and

a liquid crystal layer disposed between the first substrate and the second substrate,

Wherein, the first substrate further includes a second blue photoresist, which is filled at the junction of the red photoresist and the green photoresist, and the lateral light leakage from the backlight module is reduced by the second blue photoresist .

In one embodiment, the second blue photoresist is filled in a horn shape. In one embodiment, the second blue photoresist at least partially overlaps the red photoresist and the blue photoresist. In one embodiment, the length of the second blue photoresist is equal to the length of the red photoresist or the green photoresist.

In one embodiment, the critical dimension (CD) of the second blue photoresist is between 10 microns and 14 microns. For example, the line width of the second blue photoresist is 13.85 microns.

According to another aspect of the present invention, a method for manufacturing a curved liquid crystal display panel capable of reducing lateral light leakage is provided, comprising the following steps:

providing a first substrate;

A red photoresist and a green photoresist are sequentially formed by using a yellow photoresist;

A first blue photoresist and a second blue photoresist are formed by using a yellow light process and a half-tuning mask, and the second blue photoresist is filled at the junction of the red photoresist and the green photoresist, by reducing lateral light leakage from the backlight module by the second blue photoresist;

providing a second substrate disposed opposite to the first substrate; and

A black matrix is formed, facing to the gaps between adjacent photoresists of different colors.

In one embodiment, the second blue photoresist is filled in a horn shape. In one embodiment, the second blue photoresist at least partially overlaps the red photoresist and the blue photoresist.

In one embodiment, the length of the second blue photoresist is equal to the length of the red photoresist or the green photoresist.

Using the curved liquid crystal display panel and its manufacturing method of the present invention, the first substrate includes a color filter layer, and the color filter layer has a red photoresist, a green photoresist and a first blue photoresist arranged at intervals, The second substrate opposite to the first substrate includes a black matrix, and the black matrix is arranged opposite to the gap between adjacent photoresists of different colors. The liquid crystal layer is arranged between the first substrate and the second substrate, and the first The substrate also includes a second blue photoresist, which is filled at the junction of the red photoresist and the green photoresist, and the lateral light leakage from the backlight module is reduced by the second blue photoresist. Compared with the prior art, the present invention fills the blue photoresist at the junction of the red photoresist and the green photoresist, and achieves a better light-shielding effect by virtue of the lower optical characteristics of the blue photoresist. In addition, the blue photoresist can increase the shading angle of the first substrate, reduce the lateral light leakage from the backlight module without increasing the line width of the black matrix of the second substrate, and improve the display quality of the product.

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. 1A is a schematic diagram of lateral light leakage caused by protrusions at the junction of adjacent photoresists in a curved liquid crystal display panel in the prior art;

FIG. 1B is a schematic diagram of lateral light leakage caused by the concave topography at the junction of adjacent photoresists in a curved liquid crystal display panel in the prior art;

FIG. 2A shows a schematic diagram of lateral light leakage caused when the line width of the black matrix is 16 microns in a curved liquid crystal display panel in the prior art;

2B shows a schematic diagram of increasing the line width of the black matrix of FIG. 2A to 21 microns to eliminate lateral light leakage;

FIG. 3 shows a schematic structural view of a curved liquid crystal display panel that can reduce light leakage according to an embodiment of the present invention;

FIG. 4 shows a schematic diagram of the principle of increasing the shading angle of the curved liquid crystal display panel of FIG. 3 by adding a blue photoresist under the black matrix;

Fig. 5 shows a schematic embodiment of the curved liquid crystal display panel of Fig. 3; and

FIG. 6 shows a flowchart of a method for manufacturing a curved liquid crystal display panel that can reduce light leakage according to another embodiment of the present invention.

Detailed ways

In order to make the technical content disclosed in the present invention 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.

FIG. 1A is a schematic diagram of lateral light leakage caused by protrusions at the junction of adjacent photoresists in a curved liquid crystal display panel in the prior art. FIG. 1B is a schematic diagram of lateral light leakage caused by concave topography at the junction of adjacent photoresists in a curved liquid crystal display panel in the prior art.

Referring to FIG. 1A , the curved liquid crystal display panel includes two opposite substrates, wherein the upper substrate is provided with a black matrix 104 , and the lower substrate includes a red photoresist 100 , a green photoresist 102 and a second metal layer 106 . The red photoresist 100 and the green photoresist 102 overlap each other, and the second metal layer 106 is located under the red photoresist 100 and the green photoresist 102 . As mentioned above, when the black matrix 104 of the upper substrate is bent after the panel is bent, there will be a relative displacement (for example, the maximum displacement to the right can reach 25 microns), and it is easy to cause the overlapping of adjacent photoresists to be poorly matched and cannot be used. When the process parameters are overlaid, there will be a convex junction (that is, an increase in the overlap between the photoresists) topography. At this time, the backlight from the backlight module will be diffracted at the junction topography, resulting in lateral light leakage.

Similarly, in FIG. 1B , when the black matrix 104 of the upper substrate is displaced to the left when the panel is bent, it is easy to make the overlapping of adjacent photoresists poorly matched and unable to be covered by process parameters, and a concavity at the junction appears. (that is, the overlapping portion between the photoresists is reduced), at this time, the backlight from the backlight module also tends to diffract at the boundary terrain, resulting in lateral light leakage.

FIG. 2A shows a schematic diagram of lateral light leakage caused by a black matrix line width of 16 μm in a curved liquid crystal display panel in the prior art. FIG. 2B shows a schematic diagram of increasing the line width of the black matrix of FIG. 2A to 21 μm to eliminate lateral light leakage.

Referring to FIG. 2A , a conventional curved liquid crystal display panel includes an upper substrate 200 and a lower substrate 300 disposed opposite to each other. Wherein, the upper substrate 200 is provided with a black matrix 202 . The lower substrate 300 includes a red photoresist 302 and a green photoresist 304 . The red photoresist 302 and the green photoresist 304 overlap each other, and the junction is in a concave shape. In FIG. 2A , the critical dimension (CD) of the black matrix 202 is 16 microns, as shown by the mark W1. As shown in FIG. 1B , when the black matrix 202 is relatively displaced due to bending, if the thickness of the overlapping portion of the red photoresist 302 and the green photoresist 304 is reduced, light leakage may easily occur.

As shown in Figure 2B, in order to eliminate the light leakage situation, a solution in the prior art is to increase the line width of the black matrix 202 from 16 microns to 21 microns (as shown by the mark W2), so as to ensure that even the black When the matrix is relatively displaced due to bending, it can still cover the junction between adjacent photoresists, thereby preventing lateral light leakage caused by backlight diffraction at the junction. However, this method of increasing the line width of the black matrix will sacrifice the transmittance of the panel and affect the image quality of the panel.

FIG. 3 shows a schematic structural view of a curved liquid crystal display panel capable of reducing light leakage according to an embodiment of the present invention. FIG. 4 is a schematic diagram showing the principle of increasing the shading angle of the curved liquid crystal display panel of FIG. 3 by adding blue photoresist under the black matrix.

Comparing FIG. 3 with FIG. 2B, the main difference of the present invention is that, under the condition that the line width W1 of the black matrix 202 remains unchanged (restored to the original 16 microns), the lower substrate 300 also includes a blue photoresist 40 The blue photoresist 40 is filled at the junction of the red photoresist 302 and the green photoresist 304. Due to the low transmittance of the blue photoresist 40, the lateral light leakage caused by the backlight from the backlight module at the junction is reduced. . For example, the blue photoresist 40 is filled into a horn shape, and two sides of the upper surface of the red photoresist 302 and the green photoresist 304 protrude respectively, so as to at least partially overlap the red photoresist 302 and the blue photoresist 304 .

In a specific embodiment, the length of the blue photoresist 40 is equal to the length of the red photoresist 302 or the green photoresist 304 . In addition, in an illustrative example, the line width of the blue photoresist 40 is between 10 μm and 14 μm. Preferably, the line width of the blue photoresist 40 is 13.85 microns.

Further referring to FIG. 4, if the blue photoresist 40 is not provided, the backlight is emitted from the right edge of the black matrix 202, and the shading range at this time is the space between the light L1 (as shown by the dotted arrow in FIG. 4 ) and the vertical direction. angle. After the blue photoresist 40 is installed, the backlight is emitted from the right edge of the blue photoresist 40 instead, and the shading range at this time is the angle between the light L2 (shown by the solid arrow in FIG. 4 ) and the vertical direction. It is not difficult to see that after the present invention fills the blue photoresist at the junction of the red photoresist and the green photoresist, the light-shielding range becomes larger, and there is no need to increase the line width of the black matrix.

FIG. 5 shows a schematic embodiment of the curved liquid crystal display panel of FIG. 3 . Referring to FIG. 5, the curved liquid crystal display panel includes an upper substrate and a lower substrate. The lower substrate includes a color filter layer, and the color filter layer has a red photoresist R, a green photoresist G and a first blue photoresist B1 spaced apart from each other. The upper substrate includes a black matrix 202 , which is disposed opposite to the gap between adjacent photoresists of different colors. The liquid crystal layer is disposed between the upper substrate and the lower substrate.

Moreover, the lower substrate further includes a second blue photoresist B2 (as shown by the dotted line box in FIG. 5 ). The second blue photoresist B2 is filled at the junction of the red photoresist R and the green photoresist G, and the lateral light leakage from the backlight module is reduced by the second blue photoresist B2. In addition, it can also be known from Figure 5 that with this photoresist arrangement, various forms such as RB photoresist overlap, GB photoresist overlap, and RGB photoresist overlap can be formed to achieve different light-shielding and color mixing effects .

FIG. 6 shows a flowchart of a method for manufacturing a curved liquid crystal display panel that can reduce light leakage according to another embodiment of the present invention.

Referring to FIG. 6 in conjunction with FIG. 5 , in the manufacturing method, step S11 is first performed to provide a lower substrate. Then in steps S13 and S15, a red photoresist R and a green photoresist B are sequentially formed by using a yellow light process, and then a first blue photoresist B1 and a first blue photoresist B1 are formed with a half-tone mask. The second blue photoresist B2 and the first blue photoresist B2 are filled at the junction of the red photoresist R and the green photoresist G, and the lateral light leakage from the backlight module is reduced by the second blue photoresist B2. Next, step S17 is executed to provide an upper substrate to be set opposite to the lower substrate. Finally, in step S19 , a black matrix 202 is formed, facing the gaps between adjacent photoresists of different colors.

Using the curved liquid crystal display panel and its manufacturing method of the present invention, the first substrate includes a color filter layer, and the color filter layer has a red photoresist, a green photoresist and a first blue photoresist arranged at intervals, The second substrate opposite to the first substrate includes a black matrix, and the black matrix is arranged opposite to the gap between adjacent photoresists of different colors. The liquid crystal layer is arranged between the first substrate and the second substrate, and the first The substrate also includes a second blue photoresist, which is filled at the junction of the red photoresist and the green photoresist, and the lateral light leakage from the backlight module is reduced by the second blue photoresist. Compared with the prior art, the present invention fills the blue photoresist at the junction of the red photoresist and the green photoresist, and achieves a better light-shielding effect by virtue of the lower optical characteristics of the blue photoresist. In addition, the blue photoresist can increase the shading angle of the first substrate, reduce the lateral light leakage from the backlight module without increasing the line width of the black matrix of the second substrate, and improve the display quality of the product.

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 curved liquid crystal display panel capable of reducing lateral light leakage, characterized in that the curved liquid crystal display panel comprises: A first substrate, including a color filter layer, the color filter layer has a red photoresist, a green photoresist and a first blue photoresist arranged at intervals; A second substrate, arranged opposite to the first substrate, the second substrate includes a black matrix, facing the gap between adjacent photoresists of different colors; and a liquid crystal layer disposed between the first substrate and the second substrate, Wherein, the first substrate further includes a second blue photoresist, which is filled at the junction of the red photoresist and the green photoresist, and the lateral light leakage from the backlight module is reduced by the second blue photoresist . 2. The curved liquid crystal display panel according to claim 1, wherein the second blue photoresist is filled into a horn shape. 3. The curved liquid crystal display panel according to claim 1, wherein the second blue photoresist at least partially overlaps the red photoresist and the blue photoresist. 4. The curved liquid crystal display panel according to claim 1, wherein the length of the second blue photoresist is equal to the length of the red photoresist or the green photoresist. 5 . The curved liquid crystal display panel according to claim 1 , wherein the line width of the second blue photoresist is between 10 microns and 14 microns. 6. The curved liquid crystal display panel according to claim 5, wherein the line width of the second blue photoresist is 13.85 microns. 7. A method for manufacturing a curved liquid crystal display panel that can reduce lateral light leakage, characterized in that the method for manufacturing comprises the following steps: providing a first substrate; A red photoresist and a green photoresist are sequentially formed by using a yellow photoresist; A first blue photoresist and a second blue photoresist are formed by using a yellow light process and a half-tuning mask, and the second blue photoresist is filled at the junction of the red photoresist and the green photoresist, by reducing lateral light leakage from the backlight module by the second blue photoresist; providing a second substrate disposed opposite to the first substrate; and A black matrix is formed, facing to the gaps between adjacent photoresists of different colors. 8. The manufacturing method according to claim 7, wherein the second blue photoresist is filled into a horn shape. 9. The manufacturing method according to claim 7, wherein the second blue photoresist at least partially overlaps the red photoresist and the blue photoresist. 10. The manufacturing method according to claim 7, wherein the length of the second blue photoresist is equal to the length of the red photoresist or the green photoresist.