JP2956443B2 - How to make a color filter substrate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a color filter substrate used for a display device or the like.

[0002]

2. Description of the Related Art Conventionally, R used for display and the like is used.
For the formation of a color filter substrate composed of GB and black matrix, the black matrix is a photolithography method of a metal thin film such as chromium, a photolithography method of a black pigment resist, a printing method using a screen plate, letterpress, intaglio, and planographic plate as an original. Etc. were used. The RGB is formed by a method such as photolithography of a pigment resist, printing of pigment ink, and electrodeposition of paint.

[0003] These methods are combined and used depending on the size, shape, positional accuracy, cost, work efficiency, etc., as required.

[0004]

Conventionally, as shown in FIG. 6 of the above-mentioned methods, the black matrix is a chromium thin film black matrix 7 by a photolithographic method of a metal thin film, and the RGB is a pigment resist coated on the entire surface of the substrate. rear,
The method of forming and combining the RGB dot patterns 8 by the photolithographic method has been used most often for a long time, but another manufacturing method which is more inexpensive due to high manufacturing cost has been demanded.

In response to this, a method of forming a black matrix by using a black pigment resist by a photolithography method has been adopted. By combining these, it was expected that the cost would be lower.

The arrangement of RGB includes stripe, delta (triangle), diagonal (diagonal) mosaic arrangement and the like. Characters and numerals are mainly displayed in OA such as a personal computer image which is one of display applications. A stripe array in which RGB are linearly arranged can be used. However, in the case of AV such as a television image, in order to give a smooth image to the necessity of drawing a human image in a moving image, the RGB is formed into a triangular shape. It is said that a delta (triangle) arrangement and a diagonal mosaic arrangement arranged to form a block are suitable.

[0007] For this reason, when using a printing method or an electrodeposition method for forming RGB, when using for AV such as television images, the productivity is high and the manufacturing cost is low, but the arrangement of RGB is a stripe arrangement, so It has been considered that the decline in quality is inevitable.

An arrangement in which one block is formed by arranging RGB in a triangular shape can be easily prepared by a photolithographic method of a pigment resist as in the conventional example shown in FIG. When the RGB were arranged independently, the created shape did not reach a level that could be used as RGB pixels, such as the occurrence of ink tearing during printing.

Under such circumstances, the industrial productivity is high and the cost is low, such as low material costs, equipment costs and steps, and the processing time is short. In addition, the RGB are arranged in a triangular block. A color filter substrate that can be used and has high image quality even when used for AV such as television images has been desired.

[0010]

A black matrix made of a resin in which a colorant is dispersed is formed on a substrate, and the material is made of a photoreactive resin by a printing method on the black matrix. The first color of the RGB streaks is deposited by the photoresist in which the agent is dispersed. After sequentially attaching the second and third colors, light is irradiated from the back of the black matrix, leaving only the reacted portions of the RGB streaks corresponding to the black matrix openings, and developing and dissolving the other portions. The color filter substrate is formed by forming a desired RGB arrangement.

[0011]

An RGB liner made of a photoreactive resin is formed on a substrate by a printing method, combined with a black matrix, and exposed and developed to obtain a color filter substrate having various RGB arrangements. .

According to this method, since the RGB filaments are continuous at the time of printing and are made of a resin which is a viscous material, even when the filaments are formed, the continuous filaments are not broken midway. Articles can be made. The arrangement of RGB is stripe,
Various types such as an oblique mosaic arrangement or a delta arrangement are possible, and a high-quality image suitable for AV such as a television image can be produced.

Further, since the black matrix and the RGB can have the same thickness, a color filter having small surface steps and excellent smoothness can be obtained.

Further, according to this method, since the formation of RGB, which is a main functional pattern, depends on printing, the productivity is high industrially, such as low material costs, equipment costs, and a small number of production steps. It is also advantageous.

[0015]

【Example】

(Embodiment 1) FIGS. 1 (a) and 1 (b) show the structure of one embodiment of the present invention and the arrangement of each part, and FIG.
Will be described.

Vertically 300 mm with a thickness of 1.1 mm
The substrate 1 is made of millimeter glass. A black pigment resist is applied on the substrate 1 and a black matrix 2 formed by a photolithographic method is installed within a range of 50 mm inside each end. The opening 4 has a lateral pitch of 10
0 micron, vertical pitch 250 micron, width and length are 50 micron and 120 micron respectively.

As shown in FIG. 4A, RGB stripes 6 are formed on the black matrix 2 by offset printing. The RGB filaments 6 are made of a photo-reactive resin as a material and a colorant dispersed therein, have a width of 85 microns, and have a continuous shape from the upper end to the lower end of a use range.

The pitch of one color at the time of printing is 300 microns, and three colors are sequentially formed. The pitch between the colors becomes 100 microns when the three RGB colors are formed.

Next, light irradiation with a center wavelength of 365 nm is performed from the back side (back side of the paper) of the substrate 1 shown in FIG. The irradiation energy is 100 mj / cm 2.

Of the RGB lines 6, the RGB of the opening
The filament 6b reacts and cures by light irradiation, and the RGB filament 6a on the black matrix remains unreacted.

Next, development is performed to develop and dissolve the RGB filaments 6a on the unreacted black matrix, leaving the RGB filaments 6b in the reaction-cured opening portions.

The color filter 5 formed by the above steps
Is shown in FIG. 1 (b). The first color 3a, the second color 3b, the opening 3 of the black matrix 2 formed on the substrate 1
The RGB pixels 3 of the third color 3c are formed. RGB
Pixel 3 has a thickness of 1.0 micron and black matrix 2
A smooth surface with a thickness of 1.0 micron. FIG.
FIG. 5A is a cross-sectional view of the color filter 5 in the process of creation shown in FIG. 5A, and FIG. 5A is a cross-sectional view of the color filter 5 shown in FIG. This is shown in FIG. FIG.
As shown in (b), a color filter 5 having a black matrix 2 and RGB pixels 3 on a substrate 1 and having good smoothness is provided.
Thus, an RGB arrangement having a stripe shape is formed.

(Embodiment 2) The structure and arrangement of each part of another embodiment of the present invention will be described with reference to FIG.

[0024] 300mm x 300mm with vertical thickness of 1.1mm
The substrate 1 is made of millimeter glass. A black pigment resist is applied on the substrate 1 and a black matrix 2 formed by a photolithographic method is installed within a range of 50 mm inside each end. The opening 4 has a lateral pitch of 10
0 micron, vertical pitch 250 micron, width and length are 50 micron and 120 micron respectively.

As shown in FIG. 4 (b), another opening is located on the black matrix 2 so as to extend over one corner of the opening, and another opening is located diagonally opposite the opening. The RGB filaments 6 are formed obliquely by the offset printing method so as to continuously cover the openings. This RGB line 6
Is made of a photoreactive resin and has a colorant dispersed therein, has a width of 85 microns, and has a continuous shape from the upper end to the lower end of the use range.

The pitch of one color at the time of printing is 300 microns, and three colors are sequentially formed. The pitch between the colors becomes 100 microns when the three RGB colors are formed.

Next, light irradiation with a center wavelength of 365 nm is performed from the back side (back side of the paper) of the substrate 1 shown in FIG. The irradiation energy is 100 mj / cm 2.
Of the RGB lines 6, the RGB lines 6b at the opening are:
Reacts and cures by light irradiation, RGB on black matrix
The line 6a remains unreacted.

Next, development is performed to develop and dissolve the RGB filaments 6a on the unreacted black matrix, leaving the RGB filaments 6b at the opening portions in the reaction-cured state.

The color filter 5 prepared in the above steps
Is shown in FIG. A first color 3a, a second color 3b, a third color 3a are formed in the openings 4 of the black matrix 2 formed on the substrate 1.
The RGB pixel 3 having the color 3c is formed. The RGB pixel 3 has a thickness of 1.0 μm and the black matrix 2 has a thickness of 1.0 μm, and a smooth surface can be obtained.

As described above, the color filter 5 having the black matrix 2 and the RGB pixels 3 on the substrate 1 and having a good smoothness and having the RGB arrangement in the oblique mosaic shape is formed.

(Embodiment 3) The structure and arrangement of each part of an embodiment of the present invention will be described with reference to FIG.

Vertically 300 mm x 300 mm thick
The substrate 1 is made of millimeter glass. A black pigment resist is applied on the substrate, and a black matrix 2 formed by a photolithographic method is set within a range of 50 mm inside from each end. The opening 4 comprises openings 4A and 4B, 4A having a horizontal pitch of 100 microns, a vertical pitch of 250 microns, a width and a length of 50 microns, respectively.
An opening 4B that is 120 microns, shifted 50 microns horizontally and 125 microns vertically from opening 4A is also arranged with similar dimensions.

As shown in FIG. 4C, the openings 4A are superposed on the black matrix 2 by the offset printing method.
Two types of RGB filaments 6 are formed, which are thicker and narrower in the gap between the openings 4B, and thinner in the gap between the openings 4A and thicker in the gaps between the openings 4B. The RGB filaments 6 are made of a photoreactive resin as a material and a colorant dispersed therein. The width of the thick portion is 85 and the width of the thin portion is 30 microns, and the continuous shape is formed from the upper end to the lower end of the use range. I have.

The pitch of one color during printing is 300 microns, and three colors are sequentially formed. The pitch between the colors becomes 100 microns when the three RGB colors are formed.

Next, light irradiation with a center wavelength of 365 nm is performed from the back side (back side of the paper) of the substrate 1 shown in FIG. The irradiation energy is 100 mj / cm 2.
Of the RGB lines 6, the RGB lines 6b at the opening are:
Reacts and cures by light irradiation, RGB on black matrix
The line 6a remains unreacted.

Next, development is carried out to develop and dissolve the RGB filaments 6a on the unreacted black matrix, leaving the RGB filaments 6b at the reaction hardened opening.

The color filter 5 produced by the above steps
Is shown in FIG. 1 (b). The first color 3a, the second color 3b, the opening 3 of the black matrix 2 formed on the substrate 1
RGB pixels 3 of the third color 3c are formed. RG
The B pixel 3 has a thickness of 1.0 μm and the black matrix 2 has a thickness of 1.0 μm, and a smooth surface can be obtained.

As described above, the color filter 5 having the black matrix 2 and the RGB pixels 3 on the substrate 1 and having good smoothness and having the RGB arrangement in the delta shape is formed.

In the above-described embodiment of the present invention, the method of making the printing using the offset printing is shown as the printing method. In addition, the effect can be enhanced by other printing methods.

[0040]

As to the display quality, the ease of production relating to the production yield, and the productivity directly related to the cost, the one produced by the embodiment according to the present invention and the conventional one produced by the photolithography method shown in FIG. Compare what you did.

When the display quality is assumed to be used for AV, the diagonal mosaic or the delta (triangle) arrangement is obtained in both the embodiment of the present invention and the conventional example, and the display quality is good.

Taking the number of processes as an index of productivity,
Try a comparison. In order to produce three colors, in the conventional example, 18 steps are required for three colors of 6 steps of washing, resist coating, drying, exposure, development, and drying.

On the other hand, in the embodiment of the present invention, cleaning, first color printing, second color printing, third color printing, drying, backside exposure,
The number of development and drying processes is eight times, which is less than half of the conventional photolithography method.

Further, a photomask for pattern formation relating to the formation of RGB pixels is required in the conventional example, and is not required in the embodiment of the present invention.

From the viewpoint of the use of materials, the conventional example requires a large amount for spin coating or roll coating, whereas the embodiment of the present invention requires a very small amount.

The results are shown in Table 1.

[0047]

[Table 1]

The method according to the present invention has the features of high display quality and the like, and also has a printing method as the main process of RGB formation.
There are many advantages such as a small number of production steps and the need for a photomask, and the cost can be reduced.

In terms of dimensional accuracy, a fine line of about 15 to 20 microns can be formed depending on conditions, and high definition can be realized.

The method using this method has a small step as shown in FIG. 5B, for example, and has good smoothness and practicality.

As described above, according to the present method, a color filter substrate having comprehensively excellent features such as high display quality, easy production, high productivity and expected reflection on cost can be obtained. can get.

[Brief description of the drawings]

FIG. 1 is a plan view of a color filter substrate according to a first embodiment of the present invention.

FIG. 2 is a plan view of a color filter substrate according to a second embodiment of the present invention.

FIG. 3 is a plan view of a color filter substrate according to a third embodiment of the present invention.

FIG. 4 is a plan view showing the process progress of the embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of the first embodiment of the present invention.

FIG. 6 is a plan view showing an example of preparation by a photolithographic method, which is a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Black matrix 3 RGB pixel 3a RGB pixel 1st color 3b RGB pixel 2nd color 3c RGB pixel 3rd color 4 Black matrix opening 5 Color filter 6 RGB line 6a RGB line on black matrix 6b RGB line Strip opening 7 Chrome thin film black matrix 8 RGB dot pattern

Claims (3)

(57) [Claims] 1. A black matrix comprising a resin dispersed with a colorant is formed, and a continuous line of a photoreactive resin dispersed with a colorant, which is made of a photosensitive resin, is superposed on the black matrix. A method of producing a color filter substrate in which, after irradiating light from the back surface, unreacted portions of the filaments are removed by development to form RGB pixels. 2. A method for producing a color filter substrate, wherein continuous lines are formed on the substrate by printing. 3. A color filter substrate having a structure obtained by the method according to claim 1.