JP2828024B2 - Manufacturing method of color filter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a color filter for obtaining a color display by applying to an electro-optical device such as a liquid crystal display device. 2. Description of the Related Art Hitherto, a color filter provided in an electro-optical device using a liquid crystal or the like has been obtained by a method using a printing or photolithographic process. The printing method is a method in which red, green, and blue dyes are sequentially screen-printed on electrodes of a display panel to provide a coloring layer. In the photolithographic process, as shown in FIG. 1, an animal protein such as glue or gelatin is formed, which is patterned by a photolithographic process, and a photoresist is patterned thereon, and a portion not masked by the photoresist is formed. This is a method of coloring animal proteins by dyeing them with a dye. In FIG. 1, 1 is a glass substrate, 2 is a transparent electrode, 3 is an animal protein, 4 and 5 are photomasks, 6 is a photoresist, 7 is a dye, and 8 is a protective layer. [0003] However, the former method has a disadvantage that, although the manufacturing method is relatively simple, it is difficult to form a fine pattern. The latter method is easy to form a fine pattern, but requires four photolithographic steps with high manufacturing costs, and it becomes more difficult to align the pattern more accurately as the size is reduced.
A position shift occurs, and as a result, a color shift of the electro-optical device occurs, which has a problem that it is very difficult to see and a clear color display cannot be performed. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a clear color display without color shift even in a fine pattern shape. It is an object of the present invention to provide a method for manufacturing a color filter used in an electro-optical device to be used. According to the present invention, there is provided a color filter manufacturing method, comprising the steps of: forming a plurality of electrodes made of a conductive transparent thin film on a substrate; A step of electrically connecting all the electrodes on which the layers are formed to form a group, and immersing at least a region of the electrode on which the colored layer is formed in an electrodeposition paint, and electrically connecting the same colored layer. Forming a predetermined colored layer on the electrode group by applying a voltage between the predetermined electrode group to be formed and the counter electrode immersed in the electrodeposition paint, and sequentially selecting the electrode group. And forming a plurality of color filters. FIG. 2 and FIG. 3 show an embodiment of a method for manufacturing a color filter according to the present invention, wherein In ₂ O is formed on a transparent substrate 10 such as Pyrex glass.
_After forming a striped electrode 11 by using a conductive transparent thin film such as ₃ or ITO (In ₂ O ₃ + SnO ₂ ), connecting the lead wire 12 appropriately, and containing a resin / pigment and other additives It is immersed in the electrodeposition paint 13 and a voltage is applied between the electrode 13 and the counter electrode 14 to flow a direct current. Electrodeposition coating includes anion and cation electrodeposition coating, and depending on the method, a positive (anion electrodeposition coating) or negative (cation electrodeposition coating) voltage is applied to the object to be coated. When a voltage is applied, the resin dissolved or dispersed in the coating material for electrodeposition is charged, moves toward the object to be coated, and is applied from the hydrogen ions and the anode near the object to be coated (that is, the electrode 11). It reacts with the released metal ion (in the case of anionic electrodeposition coating) or hydrogen group ion (in the case of cationic electrodeposition coating), insolubilizes in water and precipitates on the object to be coated. Next, the substrate 10 is lifted from the bath 16 and
After washing the water-soluble thin film adhering to the surface with water, it is further appropriately selected from the unpainted electrodes 11, connected to the lead wire 12 and immersed in an electrodeposition paint containing a different pigment to obtain another color. Is electrodeposited. [0010] By repeating the above steps, a multicolor paint layer is electrodeposited on each electrode and heated to form a crosslinked coating film.
A color filter is completed by forming a protective film layer. According to the above-mentioned method, it is necessary to apply a voltage to the electrode in order to deposit the paint on the electrode, and the paint does not deposit on another electrode to which no electric field is applied. . Therefore, a color filter having a fine pattern can be obtained only by miniaturizing the electrode pattern, and there is no need to perform a photolithographic process as in the conventional example, so that the production becomes easy and the cost is reduced. Further, the deposited paint has an electric resistance, and it becomes difficult for a current to flow as the coating film becomes thicker, and the increase in the film thickness is automatically suppressed. As a result, the thickness of the coating film becomes uniform on electrodes of the same color, and the occurrence of color unevenness is small. Next, an electro-optical device was constructed by combining a transparent substrate having a color filter formed as described above and another substrate. In the above embodiment, a stripe-shaped electrode has been described. However, the present invention is applicable if each electrode can be selected independently. For example, an active matrix in which a switching element such as a TFT is connected to each pixel electrode is used. In the case of the method, a filter layer of a free color can be provided on each pixel electrode. As is apparent from the above description, according to the present invention, all of the plurality of electrodes on which the same colored layer is formed are electrically connected to form a group. In the wearing paint, a predetermined colored layer is formed on the electrode group by applying a voltage between the electrode group and the counter electrode where the same colored layer is electrically connected and the same colored layer is formed. By selectively forming a color filter of a plurality of colors, a colored layer can be simultaneously formed for the same colored layer, and the manufacturing time of the color filter can be reduced. Further, since the thickness of the colored layer formed by the electrodeposition coating film is very uniform, the cell between the pair of substrates can be kept constant over all pixels, so that variations in electro-optical characteristics can be eliminated. There is an effect that an excellent color display without color unevenness can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a conventional color filter manufacturing process. FIG. 2 is an explanatory diagram of a manufacturing method according to an example of an embodiment of the present invention. FIG. 3 is an explanatory diagram of a manufacturing method according to an example of an embodiment of the present invention. [Description of Signs] 1 ... glass substrate, 2 ... transparent electrode, 3 ... animal protein, 4,5 ... photomask, 6 ... photoresist, 7 ...
Dye, 8: protective layer, 10: transparent substrate, 11: electrode, 12
... Lead wire, 13 ... electrodeposition paint, 14 ... counter electrode, 15
... Electrodeposited coating film, 16 ... Bathtub.

Claims (1)

(57) [Claims] A step of forming a plurality of electrodes made of a conductive transparent thin film on a substrate; a step of electrically connecting all of the plurality of electrodes on which the same colored layer is formed to form a group; The area of the electrode where the layer is formed is immersed in the electrodeposition paint, and a voltage is applied between a predetermined electrode group that is electrically connected to form the same colored layer and the counter electrode immersed in the electrodeposition paint. A step of forming a predetermined colored layer on the electrode group, thereby sequentially selecting the electrode group to form a color filter of a plurality of colors.