WO2016145688A1

WO2016145688A1 - Color filter substrate, method for fabricating color filter substrate, and liquid crystal display

Info

Publication number: WO2016145688A1
Application number: PCT/CN2015/075829
Authority: WO
Inventors: 谢畅
Original assignee: 深圳市华星光电技术有限公司; 武汉华星光电技术有限公司
Priority date: 2015-03-18
Filing date: 2015-04-03
Publication date: 2016-09-22
Also published as: CN104698673A

Abstract

Provided are a color filter substrate (1), a method for fabricating the color filter substrate (1), and a liquid crystal display; the method for fabricating the color filter substrate (1) comprises: fabricating a black matrix (20) on a glass substrate (10); generating color resists of various colors in sequence on the black matrix (20), so as to form a color filter layer (30); each color resist comprising a main body (31) and an extending part (32, 33, or 34), the main body (31) being rectangular, and the extending parts (32, 33, or 34) being located at each of the vertices of the rectangle of the main body and extending toward the opposite side of the rectangle. In the color filter substrate (1), each color resist is provided with an extending part (32, 33, or 34), thus preventing the phenomenon of light leakage; the process of fabrication is simple and costs are low.

Description

Color film substrate, method for preparing color film substrate and liquid crystal display

Technical field

The present invention relates to the field of liquid crystal display technology, and in particular, to a color film substrate, a method for preparing a color film substrate, and a liquid crystal display.

Background technique

In the preparation process of the liquid crystal display, the array substrate and the color film substrate are separately prepared, and then the array substrate and the color film substrate are paired to form a liquid crystal cell. Wherein, the black matrix on the color filter substrate corresponds to the positions of the scanning lines, the data lines, and the thin film transistors (TFTs) on the array substrate, and the scanning lines, the data lines, the thin film transistors, and the like are blocked by the black matrix. component.

During the process of pairing the array substrate with the color filter substrate, especially for a large-sized liquid crystal display, a misalignment often occurs between the array substrate and the color filter substrate, so that the black matrix and the scan lines, the data lines, and the thin film transistors are Misplaced. The misalignment causes light leakage at the edge of the black matrix, thereby causing a crosstalk (V-CrossTalk) phenomenon, which affects the display effect of the liquid crystal display.

As the mainstream of the display, the liquid crystal display is becoming more and more widely used, and the corresponding performance is also improved. For example, the size of the display is getting larger and larger, the color is getting richer, and the brightness is getting higher and higher. However, the above performance improvement will directly or indirectly increase the difficulty of preparation of the liquid crystal display. A slight inadvertentness in the process causes the liquid crystal display to leak light and affect the display effect.

technical problem

In view of the above, the present invention provides a color film substrate, a method for preparing a color film substrate, and a liquid crystal display to avoid the occurrence of light leakage.

Technical solution

To solve the above technical problem, an embodiment of the present invention provides a method for preparing a color film substrate, including:

(1) preparing a glass substrate;

(2) preparing a black matrix on the glass substrate;

(3) sequentially generating color resists of a plurality of colors on the black matrix to form a color film layer, the color resist comprising a main body portion and an extension portion, wherein the main body portion has a rectangular shape, and the extension portion is located at the The vertices of the rectangle of the body portion extend toward opposite sides of the rectangle.

Preferably, the extension is one of a rectangle, a circle, a diamond or a trapezoid.

Preferably, the extension portion coincides with the body portion.

Preferably, the center of the extension coincides with the apex of the illustrated body portion.

Preferably, the step (3) specifically includes:

Coating a photoresist of a first color on the black matrix and performing prebaking;

Exposing the photoresist through a mask;

Developing and etching to form a color resistance of the first color;

According to the preset coating sequence, other preset colors are formed accordingly.

Preferably, the reticle includes a reticle main body portion and a reticle extension portion, and the reticle main body portion has a rectangular shape, and the reticle extension portion is located at the apex of the rectangle of the reticle main body portion toward the rectangular shape The opposite side extends.

Preferably, the predetermined coating sequence comprises one of the following: red, blue, and green color resists; red, blue, green, and yellow color resists; or red, blue, green, and white color resists; When the three-color color resist is applied, the formed three-color color resist is distributed in a strip shape, a diagonal line or a mosaic shape; when the four-color color resist is applied, the formed four-color color resist is distributed in a mosaic form.

Preferably, after the step (3), the method further includes:

(4) sputtering a transparent electrode layer on the color film layer.

The invention also provides a color film substrate comprising:

glass substrate;

a black matrix formed on the glass substrate;

a color film layer formed on the black matrix, the color film layer including color resistance of a plurality of colors, and the color resistance includes a main body portion and an extension portion, and the main body portion has a rectangular shape, and the extension portion is located The vertices of the rectangle of the body portion extend toward opposite sides of the rectangle.

Preferably, the extension portion coincides with the body portion.

Preferably, the color resistance of the plurality of colors comprises one of the following:

Red, blue, and green color resists, and the three color resists formed by the three color resists are strip-shaped, diagonal, or mosaic-like; or

The four color resists of red, blue, green and yellow, or the four color resists of red, blue, green and white, and the four color resists formed by the four color resists are mosaic-like.

Preferably, the color film layer further comprises a sputtered transparent electrode layer.

The present invention also provides a liquid crystal display comprising the above color film substrate.

Beneficial effect

Compared with the prior art, the color film substrate, the color film substrate manufacturing method and the liquid crystal display of the present invention prevent the color resistance from shrinking due to surface tension by forming an extension at the apex of each color resistance of the color film layer. The light leakage area avoids the phenomenon of light leakage, and the preparation process is simple and the cost is low.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. The drawings in the following description are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a schematic flow chart of a method for preparing a color film substrate according to Embodiment 1 of the present invention;

2A-2C are schematic top views of a single color resist in the first embodiment of the present invention;

3A-3D are top plan views of a plurality of color resists in the first embodiment of the present invention;

4 is a schematic cross-sectional view showing a color filter substrate according to Embodiment 2 of the present invention;

FIG. 5 is a cross-sectional view showing a liquid crystal display device according to Embodiment 3 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Please refer to the drawings in the drawings, in which the same reference numerals represent the same components. The following description is based on the specific embodiments of the invention, which are not to be construed as limiting the invention.

Embodiment 1

Please refer to FIG. 1 , which shows a method for preparing a color film substrate according to the present invention.

In step S101, a glass substrate is prepared.

It can be understood that the preparation process of this step is mainly to cut according to a predetermined size and to be cleaned by a washing machine.

In step S102, a black matrix is prepared on the glass substrate.

Specifically, the step of preparing the black matrix can also be refined to:

(1) sputtering a black film on the glass substrate, the black film comprising a black chrome film or a black pigment film;

(2) performing photoresist coating on the black film and performing prebaking to form a photoresist layer;

(3) irradiating the photoresist layer with ultraviolet rays through a photolithography mask;

(4) sequentially exposing and developing the photoresist layer;

(5) etching the black film in accordance with the development result;

(6) The black film is subjected to photoresist stripping, and a black matrix is formed, which is used for shading.

In step S103, color resists of a plurality of colors are sequentially generated on the black matrix to form a color film layer.

2A-2C are schematic top views of a single color resist in an embodiment of the present invention. In summary, the color resist includes a color resist body portion 31 and a color resist extension portion (32, 33 or 34). The color resisting body portion 31 has a rectangular shape, and the color resisting extension portion (32, 33 or 34) extends at opposite vertices of the rectangular portion of the main body portion 31 toward opposite sides of the rectangular shape, and may have any predetermined shape. As shown in FIG. 2A, the color resisting extension portion 32 has a rectangular shape, or the color resisting extension portion 33 has a circular shape as shown in FIG. 2B, or the color resisting extension portion 34 has one of irregular polygons as shown in FIG. 2C. Diamond or trapezoidal. Further, the extension portion (32, 33 or 34) of the color resist is partially overlapped with the main body portion 31. One of the cases of coincidence is that the center of the extension (32, 33 or 34) coincides with the apex of the illustrated main body portion 31.

It can be understood that in the present invention, it is also necessary to design a mask having an irregular shape. The irregularly shaped reticle includes a reticle main body portion and a reticle extension portion, and the reticle main body portion has a rectangular shape, and the reticle extension portion is located at each apex of the rectangle of the reticle main body portion toward the The opposite sides of the rectangle extend and can assume any predetermined shape. Since the shape of the mask is in one-to-one correspondence with the color resistance formed by the mask, the shape thereof can also be referred to the above-mentioned FIGS. 2A to 2C.

The specific steps of sequentially forming the color film layer include:

(1) coating a photoresist of a first color on the black matrix, and performing prebaking;

(2) exposing the photoresist through the above mask;

(3) performing development and etching to form a color resistance of the first color;

(4) Returning to the process of the step (1) in accordance with the preset coating sequence to thereby form color resists of other preset colors.

The predetermined coating sequence includes one of the following: (1) red, blue, green, that is, RBG three colors; (2) red, blue, green, yellow, that is, RBGY four colors; or (3) Red, blue, green, white, that is, RGBW four colors. The advantage is that it protects the color set behind, giving it a more natural, bright color and a clearer picture.

It can be understood that the order of the above colors can be adjusted according to the size of the liquid crystal display and the product category of the final application. For example, the color of a large-sized advertising liquid crystal display applied to the outdoor should be brighter, and the monitoring display applied to the monitoring room can be darker, and the coating order of the corresponding color is correspondingly shifted back.

Please refer to FIG. 3A to FIG. 3D , which are schematic top views of a plurality of color resists. Wherein, in the case of the above-mentioned RBG three colors, the three-color color resistance formed therein has a strip shape as shown in FIG. 3A, a diagonal line as shown in FIG. 3B, or a mosaic shape as shown in FIG. 3C. In the case of the above four colors of RGBY or RGBW, the four color resists formed are in a mosaic-like distribution as shown in FIG. 3D, where X represents Y or W.

It can be understood that since the photoresist is liquid or gel-like at the time of coating, it shrinks due to its surface tension, forms a round-shaped edge such as water droplets at the edge, and forms an unevenness after baking. The curved surface, which in turn forms a light leakage area. In this step, the extension is performed at the apex of the original body portion which is most easily contracted, thereby avoiding the phenomenon of light leakage due to surface tension, and the preparation process is simple and the cost is low.

In step S104, a transparent electrode layer is sputtered on the color film layer.

The transparent electrode layer is an indium tin oxide (ITO) film, and a protective film may be further disposed between the ITO film and the color film layer, and the preparation step is: applying glue on the color film layer by a glue applicator The machine is coated to form the protective film.

In the method for preparing a color filter substrate of the present invention, by providing an extension portion at the apex of each color resistance of the color film layer, the color resistance is prevented from shrinking due to surface tension to form a light leakage region, thereby avoiding light leakage, and the preparation process Simple and low cost.

Embodiment 2

Referring to FIG. 4, a cross-sectional view of the color filter substrate is shown.

The color filter substrate 1 includes a glass substrate 10, a black matrix 20, a color filter layer 30, a protective film 40, and a transparent electrode layer 50.

The black matrix 20 is formed on the glass substrate 10.

A color film layer 30 is formed on the black matrix 20, and the color film layer 30 includes color resists of a plurality of colors.

2A-2C are schematic top views of a single color resist in an embodiment of the present invention. Among them, the color resist includes a main body portion 31 and an extension portion (32, 33 or 34). The main body portion 31 has a rectangular shape, and the extension portion (32, 33 or 34) extends at opposite vertices of the rectangular portion of the main body portion 31 toward opposite sides of the rectangular shape, and may have any predetermined shape. The extension 32 is rectangular in shape as shown in Fig. 2A, or the extension 33 is circular as shown in Fig. 2B, or the extension 34 is one of irregular polygons as shown in Fig. 2C. Moreover, the extension portion (32, 33 or 34) of the color resist is partially overlapped with the main body portion 31. One of the cases of coincidence is that the center of the extension (32, 33 or 34) coincides with the apex of the illustrated main body portion 31.

Wherein, the distribution of the color resistance includes the following situations:

(1) The color resistance is divided into red, blue, and green, that is, when the RBG is three colors, the three color resists formed therein are in the shape of a strip as shown in FIG. 3A, as shown in FIG. 3B, or a mosaic-like distribution as shown in Figure 3C;

(2) When the color resistance is divided into four colors of red, blue, green, yellow or red, blue, green, and white, the four color resists formed are in a mosaic shape as shown in FIG. 3D, wherein X Represents Y or W.

In the color filter substrate of the present invention, by providing an extension portion at the apex of each color resist of the color filter layer, the color resist is prevented from shrinking due to surface tension to form a light leakage region, thereby avoiding light leakage.

Embodiment 3

Referring to FIG. 4, a cross-sectional view of a liquid crystal display of the present invention is shown.

The liquid crystal display mainly comprises: a color film substrate 1, an array substrate 2, a liquid crystal layer 3, and a backlight (not labeled).

The array substrate 2 includes, in order from the backlight (arrow) direction to the liquid crystal layer direction, a polarizer 21, a glass substrate 22, a transparent conductive film (pixel electrode) 23, and an alignment film 24.

The color filter substrate 1 includes, in order from the human eye direction to the liquid crystal layer direction, a polarizer 12, a glass substrate 10, a black matrix 20, a color filter layer 30, a protective film 40, a transparent electrode layer 50, and an alignment film 11.

It can be understood that the color filter substrate 1 is prepared by the preparation method of the first embodiment or the color film substrate of the second embodiment. Since the front view shape of the color filter substrate 1 has been highlighted in the above embodiment, FIG. 2 and FIG. 3, details are not described herein again.

Good products are not only generated, but also designed. In the liquid crystal display of the present invention, by providing an extension at the apex of each color resistance of the color film layer, the color resistance is prevented from shrinking due to surface tension to form a light leakage region, thereby avoiding light leakage, and the preparation process is simple and the cost is low. .

It is to be understood that although the embodiments have different emphasis, the design concept is the same, and the detailed description of the embodiments is not described in detail.

In the above, the present invention has been described above by way of a preferred embodiment, but the preferred embodiments are not intended to limit the invention, and the various testers of the present invention can make various modifications without departing from the spirit and scope of the invention. The invention is modified and retouched, and the scope of the invention is defined by the scope defined by the claims.

Claims

A method for preparing a color film substrate, comprising:

(1) preparing a glass substrate;

(2) preparing a black matrix on the glass substrate;

(3) sequentially generating color resists of a plurality of colors on the black matrix to form a color film layer, the color resist comprising a main body portion and an extension portion, wherein the main body portion has a rectangular shape, and the extension portion is located at the The vertices of the rectangle of the body portion extend toward opposite sides of the rectangle.
The production method according to claim 1, wherein the extension portion is one of a rectangle, a circle, a diamond, or a trapezoid.
The production method according to claim 2, wherein the extension portion is partially overlapped with the main body portion.
The production method according to claim 2, wherein a center of the extension coincides with a vertex of the body portion shown.
The preparation method according to claim 1, wherein the step (3) specifically comprises:

Coating a photoresist of a first color on the black matrix and performing prebaking;

Exposing the photoresist through a mask;

Developing and etching to form a color resistance of the first color;

According to the preset coating sequence, other preset colors are formed accordingly.
The preparation method according to claim 5, wherein the mask comprises a mask main body portion and a mask extension, and the mask main body portion has a rectangular shape, and the mask extension portion is located in the mask main body portion. The vertices of the rectangle extend toward opposite sides of the rectangle.
The preparation method according to claim 5, wherein the predetermined coating sequence comprises one of the following: red, blue, and green color resists; red, blue, green, and yellow color resists; or red and blue , green and white color resistance;

And when the three-color color resist is applied, the formed three-color color resist is distributed in a strip shape, a diagonal line or a mosaic shape; when the four-color color resist is applied, the formed four-color color resist is distributed in a mosaic form.
The preparation method according to claim 1, wherein after the step (3), the method further comprises:

(4) sputtering a transparent electrode layer on the color film layer.
A color film substrate, comprising:

glass substrate;

a black matrix formed on the glass substrate;

a color film layer formed on the black matrix, the color film layer including color resistance of a plurality of colors, and the color resistance includes a main body portion and an extension portion, and the main body portion has a rectangular shape, and the extension portion is located The vertices of the rectangle of the body portion extend toward opposite sides of the rectangle.
The color filter substrate according to claim 9, wherein the extension portion is one of a rectangle, a circle, a diamond, or a trapezoid.
The color filter substrate according to claim 10, wherein the extension portion is overlapped with the main body portion.
A color filter substrate according to claim 10, wherein a center of said extension portion coincides with a vertex of said main body portion.
The color filter substrate according to claim 9, wherein the color resistance of the plurality of colors comprises one of the following:

Red, blue, and green color resists, and the three color resists formed by the three color resists are strip-shaped, diagonal, or mosaic-like; or

The four color resists of red, blue, green and yellow, or the four color resists of red, blue, green and white, and the four color resists formed by the four color resists are mosaic-like.
The color filter substrate of claim 9, wherein the color filter layer further comprises a sputtered transparent electrode layer.
A liquid crystal display comprising the color filter substrate of claim 9.