JPH0690326B2 - Method for manufacturing color filter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a color filter used for a color TV using a liquid crystal, a solid-state image pickup tube, or the like.

(Prior Art) As a first conventional manufacturing method of a color filter, Japanese Patent Publication No.
52-17376 and JP-A-57-139712 are known. In this method, a dyeable resin layer such as gelatin is applied to a glass substrate or the like, and the dyed resin layer is partially dyed through a photoresist window.

As a second conventional method for manufacturing a color filter, Japanese Patent Laid-Open No. 59-50411 is known. This is done by first forming a pattern of a black light-shielding portion on the coloring base on the substrate, then irradiating heat rays to the entire surface of the coloring base to harden the black light-shielding portion, or to perform a film hardening treatment on the black light-shielding portion. After that, the coloring bases other than the black light-shielding portion are separately colored into predetermined colors with arbitrary coloring materials. By the process of baking the black light-shielding portion or hardening the black light-shielding portion, the black light-shielding portion prevents the coloring material from diffusing between the adjacent colored portions with the black light-shielding portion as a boundary. The color of the colored portion and the color of the adjacent colored portion are prevented from being mixed.

(Problems to be Solved by the Invention) In the above-described first conventional manufacturing method, due to an error in mask alignment, an undyed gap is formed between adjacent dyed portions, or a phenomenon of the photoresist 1 remains in the dyed portions. Defects that are not dyed due to dust, dust, etc. are formed, and when the substrate produced by this manufacturing method is used as a color filter, these undyed parts allow light to pass through well, appear bright, and their defects are conspicuous. Further, there is a problem that the transmitted white light reduces the chromaticity of the color filter.

Further, in the above-mentioned second conventional manufacturing method, there is a problem that the step of patterning the photoresist for forming the black light-shielding portion and the photomask for the same are required, which requires labor and cost for manufacturing.

Also, in the process of patterning the photoresist when the coloring bases other than the black light-shielding portion are colored and colored with the respective coloring materials, if there is an alignment error in the photoresist patterning the photoresist, the window of the photoresist is opened. Is insufficient, the photoresist covers a part of the coloring base that is desired to be colored, and the part that is desired to be colored cannot be colored, resulting in an uncolored defect. Moreover, since there is no step of finally dyeing this defect black, this defect remains until the end, and when the substrate is used as a color filter, this defect part appears white and the chromaticity of each dyed part appears. Will decrease. In order to prevent this, strict precision is required for mask alignment at the time of patterning the photoresist so that an error in the alignment of the photomask does not occur, and there has been a problem that it takes time to manufacture the color filter.

The present invention aims to solve the problems of the prior art as described above.

(Means for Solving the Problems) In order to solve the above problems, the method for producing a color filter according to the present invention comprises a step of applying a photoresist on a substrate and a dyeable resin layer, and then applying a photoresist. Patterning the photoresist, opening the window in the photoresist, dyeing and dyeing the dyeable resin layer through the window, repeating the patterning, dyeing and dyeing steps, and then the photoresist between the adjacent windows. After removing the photoresist remaining in the window, the entire dyeable resin layer is dyed black to dye the undyed part of the dyeable resin layer black.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 2, a dyeable resin layer 2 such as gelatin is provided on a transparent substrate 1 such as glass. A photoresist 3 is applied on it. After that, as shown in FIG. 3, the photoresist 3 is exposed using the photomask 4, and as shown in FIG. 4, the photoresist 3 is developed and a window is opened. At this time, if the removal of the photoresist 3 is insufficient, the photoresist 3 may remain in the window 3a of the photoresist 3.

Further, after the window of the photoresist 3 has been opened, dust, dust, etc. may adhere to the portion of the dyeable resin layer 2 facing the window 3a.

After that, the portion of the dyeable resin layer 2 facing the window portion 3a is dyed red, for example, to form a dyed portion R. At this time, the remaining photoresist, dust, and dust as described above cause the fourth portion in the dyed portion R.
There is an unstained defect 8a as shown. After that, the dyeing portion R is subjected to a dye-proof treatment. The stain-proofing treatment is performed, for example, with an aqueous solution of tannic acid-containing acetic acid and an aqueous solution of antimony potassium tartrate.

Next, as shown in FIG. 5, the photoresist 3 is exposed by using another photoresist 5, and the photoresist 3 is exposed as shown in FIG.
Is developed, a window is opened therein, and a portion of the dyeable resin layer 2 facing the window 3b is dyed with a second color, for example, green to form a dyed portion G. After that, the dyeing part G is subjected to a dye-proof treatment.

After that, as shown in FIG. 7, another photomask 6 is similarly formed.
8 is used to expose the photoresist 3, and as shown in FIG. 8, the photoresist 3 is developed and a window is opened in the photoresist 3, and the portion of the dyeable resin layer 2 facing the window 3c is changed to a third color, for example, blue. The dyed part B is dyed. After that, the dyeing part B is subjected to a dye-proof treatment.

Similar to the dyed portion R, the photoresist 3 may remain in the window portions 3b and 3c of the photoresist 3 in the dyed portion G or the dyed portion B as well. Also, dust, dust, etc. may adhere to the portion of the dyeable resin layer 2 facing the window of the photoresist 3.

Therefore, as shown in FIG. 8, there is an undyed defect 8b in the dyed portion B due to the above-described residual photoresist, dust, and dust.

In FIG. 8, the gap 7 between the adjacent dyed parts is an undyed part, and the photoresist 3 is adhered on this, and as described above, due to the residual photoresist, dust, and dust, each dyed part also has a stain. There are undyed defects 8a and 8b, on which photoresist, dust, or dust is attached. Further, since the gap 7 and the defects 8a and 8b are covered with photoresist or dust, no stain-proof treatment is applied.

After that, as shown in FIG. 1, all the photoresist, dust, and dust adhering to the dyeable resin layer 2 are peeled and removed. As a result, the gap 7 and the defects 8a and 8b of the dyeable resin layer 2 are exposed to the outside.

Then, by putting the whole substrate 1 in a black dyeing bath, the whole dyeable resin layer 2 is dyed black, and only the gap 7 and the defects 8a, 8b which have not been subjected to the dye-proof treatment are dyed black.

Therefore, as shown in FIG. 1, all of the dyeable resin layer 2 except the true dyed portions of the dyed portions R, G, B can be black light shielding portions, and the dyeable resin layer 2 is not There is no colored part,
This can be easily achieved by dyeing the entire dyeable resin layer 2 black. When the substrate 1 is used as a color filter, it is possible to prevent the chromaticity of each dyed portion from being reduced because there is no white light passage portion.

(Effect of the Invention) In the last step of the present invention, the entire dyeable resin layer is dyed in black to form a black light-shielding portion, and in order to form the black light-shielding portion, patterning of a photoresist and its use You don't need a photomask.

In addition, if the entire dyeable resin layer is dyed black in the last step, all but the true dyed portion of the dyed portion of the dyeable resin layer can be black light-shielding portions. There are no non-colored parts in the layer, and strict precision in mask alignment at the time of photoresist patterning is not required to achieve this, so that the manufacturing is easy and the cost can be reduced.

Moreover, since the dye-proof treatment is performed every time each color is dyed, it is possible to prevent color mixing between adjacent dyed portions.

In addition, the color filter according to the present invention can prevent the chromaticity of each dyed portion from being reduced because there is no white light passing portion.

[Brief description of drawings]

The drawings show the embodiments of the present invention. FIG. 1 is a sectional view of a color filter manufactured according to the present invention, and FIGS. 2 to 8 are sectional views showing manufacturing steps. 1 ... Substrate, 2 ... Dyeable resin layer, 3 ... Photoresist, 3a, 3b, 3c ... Window part, 7,8a, 8b ... Undyed part.

Front page continuation (72) Inventor Kenji Muta 4-1-1 Taihei, Sumida-ku, Tokyo Inside Seikosha Co., Ltd. (56) References JP-A-56-75606 (JP, A) JP-A-59-50411 (JP, A)

Claims (1)

[Claims] 1. A step of applying a photoresist on a substrate provided with a dyeable resin layer, and thereafter patterning the photoresist to open a window in the photoresist, and the dyeable resin through the window. After the steps of dyeing / resisting a layer and repeating the above-mentioned patterning, dyeing, and resisting steps, and then removing the photoresist between the adjacent windows and the photoresist remaining in the window, the dyeability And a step of dyeing the undyed portion of the dyeable resin layer in black by dyeing the entire resin layer in black.