JPH0627314A - Color filter manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a method for manufacturing a color filter, which aims to flatten a pixel surface. [Structure] In step 21, a black mask pattern is printed on a smooth surface of a master substrate having heat resistance and resin releasability, and in step 22, a colored resin is printed on the master substrate. In the next step 23, a transparent substrate having better resin adhesion than the master substrate is placed on the colored resin, and in step 24 the transparent substrate is pressed toward the master substrate. Then, in step 25, after performing a baking treatment of the black mask pattern and the colored resin under the pressure, the step
In step 26, the master substrate is separated from the black mask pattern and the colored resin, or in step 26, the master substrate is separated from the black mask pattern and the colored resin, and then in step 25 ′, the black mask pattern and the colored resin are baked. Configure as you go.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter for a color liquid crystal display panel or the like. In recent years, cases of using various flat panel display devices, which are friendly to space saving, are increasing in number as terminals of computer systems, but colorization is required as the amount of display information increases.

Therefore, a color liquid crystal display panel has been used in which a color filter is formed on one panel substrate of the liquid crystal display panel having characteristics such as thinness, light weight and low power consumption.

[0003]

2. Description of the Related Art In a color liquid crystal display panel, a color filter composed of pixels of three colors of red (R), green (G) and blue (B) is formed on a transparent substrate and the pixels of these three colors are selectively driven. Then, the colors are mixed and any color is displayed.

Color pixel manufacturing methods include a pigment dispersion method using a resin in which a pigment is dispersed, a dyeing method in which gelatin is dyed with a dye, and an electrodeposition method in which a transparent electrode is formed and the surface is colored by an electrophoretic method. ， There are printing methods such as applying color ink to the plate and transferring it, but the pigment dispersion method, which is formed by the photolithography method from the photosensitive resin film in which the pigment is dispersed, is the most suitable because it can make the pattern accuracy and thickness uniform. Is.

FIG. 4 is a sectional view showing the main structure of the color liquid crystal display panel, and FIG. 5 is an explanatory view of the manufacturing process of the conventional color filter shown in FIG. In FIG. 4, a liquid crystal display panel 1 has a transparent substrate 2 in which a pair of transparent substrates (glass substrates) 2 and 3 are opposed to each other with a constant gap and the periphery is hermetically sealed with a sealing material 4.
The liquid crystal 5 is filled in the facing gaps of 3 and 3.

On the other surface (upper surface) of the substrate 2 provided with the polarizing plate 11 on one surface (lower surface), a large number of transparent electrodes 6 extending in the thickness direction of the drawing paper and unevenness due to the transparent electrodes 6 are formed. And an alignment film 7 which is to be flattened.

On the other surface (lower surface) of the substrate 3 having the polarizing plate 12 on one surface (upper surface), the black mask pattern 8 is formed.
A color filter composed of red pixels R, green pixels G and blue pixels B, and a large number of transparent electrodes 9 extending in the left-right direction,
An alignment film 10 is formed to fill the irregularities formed by the transparent electrode 9 and flatten it.

In FIG. 5, after forming the black mask pattern 8 on the surface of the transparent substrate 3, a photosensitive resin film for forming the first pixel, for example, a photosensitive resin film 14 in which a red pigment is dispersed, is generally spun. It is applied by the coating method.

Next, a pre-baking process for the resin film 14 is performed.
(90 ° C. for a few minutes), the oxygen barrier film 15 is deposited thereon, and the oxygen barrier film 15 is baked (at 90 ° C. for a few minutes).

Next, the resin film 14 is exposed to light using the mask 16, and the oxygen blocking film 15 and the non-photosensitive portion of the resin film 14 are removed by a developing process, and post-baking of the pixel R formed of the resin film 14 is performed. Perform treatment (at 200 ° C for several minutes).

Thereafter, the same steps as those for the pixel R are repeated to form the pixel G and the pixel B, and the color filter is completed.

[0012]

In the color liquid crystal display panel, it is necessary to make the thickness of the filled liquid crystal 5, that is, the facing distance between the alignment films 7 and 10 constant. Since the applied electric field strength is not constant,
The lighting voltage changes and the display surface becomes uneven.

However, in the conventional pigment dispersion method described with reference to FIG. 5 and the color filter prepared by the dyeing method (not shown), the step of selectively removing the resin film formed by applying the spinner is performed in three steps. Will be repeated.

Therefore, the resin film applied in the second and third times is influenced by the pixels formed in the previous step, and the difference in the resin liquid application conditions of three times (atmosphere temperature and humidity, resin liquid temperature). , Deterioration of resin liquid, etc.) does not result in uniform thickness.

The color filter by the electrodeposition method has 3
The film thickness varies due to the difference in the conditions of the color electric field liquid (liquid concentration, liquid temperature, etc.), and the color filter produced by the printing method has three
Since the film thickness varies due to the difference in printing conditions that are performed separately, unevenness can be created on the upper surface of each pixel,
They are inferior to color filters produced by the pigment dispersion method.

[0016]

According to the process chart of FIG. 1, the method of the present invention prints a black mask pattern on a smooth surface of a master substrate having heat resistance and resin releasing property at step 21, and at step 22. A colored resin is printed on the master substrate.

Next, in step 23, a transparent substrate having a better resin adhesion than the master substrate is placed on the colored resin,
In step 24, the transparent substrate is pressed against the master substrate.

Thereafter, in step 25, the black mask pattern and the colored resin are baked in the above-mentioned pressurized state, and then the master substrate is peeled from the black mask pattern and the colored resin in step 26, or in step 26. After the master substrate is separated from the black mask pattern and the colored resin, the black mask pattern and the colored resin are baked in step 25 '.

[0019]

According to the above means, the master substrate has heat resistance,
A transparent substrate having a resin releasing property and having a resin adhesive force superior to that of the master substrate is used as the transparent substrate on which the color film is to be formed, and the black mask pattern and the colored resin printed on the master substrate are transferred to the transparent substrate.

Therefore, if the black mask pattern and the colored resin printed surface of the master substrate are flat, the upper surface of the black mask pattern and the colored resin transferred to the transparent substrate will transfer the flatness of the master substrate printed surface, The unevenness in the thickness of a large number of pixels having different colors is eliminated, and the manufacturing process is significantly shortened as compared with the pigment dispersion method using the photolithography technique.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the main steps of the method of the present invention, FIG. 2 is an illustration of the main steps in an embodiment of the method of the present invention, and FIG. 3 is an illustration of another embodiment of the method of the present invention.

In step 21 of FIG. 1, a black mask pattern is printed on the upper surface of the master substrate having heat resistance and resin separating property. 2 (A) and 2 (B) are examples of the structure of the master substrate in the method of the present invention.

In the master substrate 31 shown in FIG. 2 (A), the upper surface of the Teflon plate 33 is finished to have a smooth surface, and a polyimide resin film 34 having good resin separation is coated thereon by a spin coating method or the like.

In the master substrate 32 shown in FIG. 2B, a Teflon film 36 is coated on a smooth upper surface of a glass thin plate 35, and a polyimide resin film 34 is coated thereon by a spin coating method or the like.

The black mask pattern 37 formed on the polyimide resin film 34 uses a resin in which a black pigment is dispersed, has a thickness of about 1 to 2 μm, and a large number of through holes 38 are aligned for forming pixels.

In step 22 following step 21 in FIG. 1, on the polyimide resin film 34 of the master substrate 31 (or 32),
At the same time, an appropriate amount of colored (pigment dispersed) resin such as red resin 39, green resin 40 and blue resin 41 is printed in the through hole 38 of the mask pattern 37 as shown in FIG. 2 (C). However, the appropriate amount of the colored resin is an amount that is filled in the through holes 38 and does not protrude beyond the through holes 38.

In a step 23 following the step 22 in FIG. 1, a transparent substrate (glass substrate) 42 having a resin adhesion superior to that of the polyimide resin film 34 on the colored resins 39, 40 and 41 as shown in FIG. 2D. In step 24 following step 23, the transparent substrate 42 is pressed toward the master substrate 31.

Then, the colored resins 39, 40, 41 are filled in the through holes 38 of the mask pattern 37, and the mask pattern 37 and the colored resin are filled.
39, 40 and 41 adhere to the transparent substrate 42. Step 24 in FIG.
2), there are two processes, that is, process 25 → process 26 and process 26 → process 25 ′, and as shown in FIG.
A color filter composed of the mask pattern 37 and the colored resins 39, 40, 41 is completed on the transparent substrate 42.

Steps 25 and 25 'are baking steps for hardening the mask pattern 37 and the colored resins 39, 40, 41.
Step 26 is a peeling step of separating the master substrate 31 from the mask pattern 37 and the colored resins 39, 40, 41 adhered to the transparent substrate 42.

In the baking step of step 25, heating is performed at about 100 ° C. for about 1 hour in the pressurized state of step 24, while
The 25 ′ baking step is performed by the step 26 in the master substrate 31
After peeling off the mask pattern 37 and the colored resin 39, 40,
41 and are heated at about 100 ° C for about 1 hour.

As another embodiment of the method of the present invention, as shown in FIG. 3, a mask pattern is formed through a transparent resin adhesive 43.
37 and the colored resins 39, 40, 41 are bonded to the transparent substrate 42, and the photo-curable or thermo-curable adhesive 43 is used as shown in FIG.
After printing the colored resin 39, 40, 41 as shown in (C), apply it on the colored resin 39, 40, 41, or apply it on the lower surface of the transparent substrate 42 before overlapping as shown in FIG. 2 (D). To do.

In the method of the present invention, if the substrate of the master substrate (the Teflon plate 31 and the glass thin plate 35) is thinned or a polyimide film is used to provide flexibility, the master substrate peeling step 26 Will be easier.

[0033]

As described above, according to the method of the present invention, the unevenness in the thickness of the multicolor pixel is eliminated, and the manufacturing process is remarkably shortened as compared with the pigment dispersion method utilizing the photolithography technique. When applied to a panel, a high quality image with no color unevenness can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a main process diagram of the method of the present invention.

FIG. 2 is an explanatory diagram of main steps in an example of the method of the present invention.

FIG. 3 is an explanatory view of another embodiment of the method of the present invention.

FIG. 4 is a sectional view showing a main configuration of a color liquid crystal display panel.

5 is an explanatory view of main manufacturing steps of the conventional color filter shown in FIG.

[Explanation of symbols]

21 is a step of forming a black mask pattern on the master substrate 22 is a step of printing a colored resin on the master substrate 23 is a step of overlaying a transparent substrate on the colored resin of the master substrate 24 is a step of pressing the transparent substrate onto the master substrate 25, 25 ′ Is a step of baking the black mask pattern and the colored resin 26 is a step of peeling the master substrate from the black mask pattern and the colored resin 31,32 is a master substrate 37 is a black mask pattern 38 is a through hole for pixel formation of the black mask pattern 39 , 40 and 41 are colored resins 42 are color filters forming a transparent substrate 43 is an adhesive

Claims (4)

[Claims] 1. A black mask pattern (37) is printed on a smooth surface of a master substrate (31, 32) having heat resistance and resin separating property, and a through hole portion (38) for pixel formation of the black mask pattern (37). ) Filling the colored resin (39, 40, 41) with the master substrate
(31, 32) is printed, and a transparent substrate (42) having a better resin adhesion than the master substrate (31, 32) is superposed on the transparent substrate.
The colored resin (39, 40, 41) is baked by pressing (42) toward the master substrate (31, 32), and the transparent substrate (4
The black mask pattern (37) and the colored resin (39, 40, 41) adhered to the transparent substrate (42) by utilizing the resin adhesion of 2) and the resin separating property of the master substrate (31, 32) (3) The master substrate (31, 32) is peeled off from (1). 2. A black mask pattern (37) is printed on a smooth surface of a master substrate (31, 32) having heat resistance and resin releasing property, and the through hole portion is filled in the through hole portion of the black mask pattern. The colored resin (39, 40, 41) is applied to the master substrate (31, 3
2) is printed, and a transparent substrate (42) having a better resin adhesion than the master substrate (31, 32) is superposed on the transparent substrate (42)
Is pressed toward the master substrate (31, 32), and the transparent substrate
The black mask pattern (37) and the colored resin (39, 40, which are adhered to the transparent substrate (42) by utilizing the resin adhesion of (42) and the resin releasability of the master substrate (31, 32). After peeling off the master substrate (31, 32) from (41), the black mask pattern (37) and the colored resin (39, 40, 41) adhered to the transparent substrate (42) are baked. A method for manufacturing a color filter, comprising: 3. A transparent adhesive is applied to the surface of the transparent substrate (42) that is in contact with the colored resin (39,40,41) printed on the master substrate (31,32) or the colored resin (39,40,41). The transparent substrate (42) is applied onto the colored resin (39, 40, 41) via the adhesive (43), and then the transparent substrate (42) is overlaid. A method for manufacturing the described color filter. 4. The method of manufacturing a color filter according to claim 1, wherein a thin plate having flexibility is used as the master substrate (31, 32).