JPH0216A - Electrooptical device - Google Patents

Abstract

PURPOSE:To obtain a sharp color display which is made into a higher density and accuracy by fine patterns by forming colored layers consisting of electrodeposition coated films on a transparent thin conductive film formed on a substrate. CONSTITUTION:An electrode 11 consisting of the transparent conductive film of ITO, etc., is formed on the transparent substrate 10 consisting of 'Pyrex(R)' glass, etc., and properly selected lead wires 11 are connected thereto; thereafter, the substrate is immersed into a paint 13 for electrodeposition contg. a resin, pigment, etc., and an electric field is impressed between said electrode and a counter electrode 14 to move the resin to the electrode 11 side and to deposit the same on the material to be coated. The substrate 10 is then pulled up from a bath cell 16 and is immersed into the electrodeposition paint of a different pigment so that the other color is electrodeposited thereon. Since the paint is not deposited on the electrodes to which the electric field is not impressed, the color display which is made into the finer accuracy and has no color slurring is executed simply by forming the electrode patterns to the finer patterns.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electro-optical device.

More specifically, the present invention relates to an electro-optical device equipped with a color filter for obtaining color display.

[Conventional technology]

Conventionally, color filters disposed in electro-optical devices using liquid crystals or the like have been obtained by the following method.

That is, colored layers were provided by screen printing red, green, and blue dyes on the electrodes of the display panel, or colored layers were provided by using a photolithography process as shown in FIG.

[Problem to be solved by the invention]

However, although the former method is relatively simple to manufacture, it has the disadvantage of making it difficult to form fine patterns, while the latter method uses photolithography, which makes it easy to form fine patterns but requires high manufacturing costs. The process is required four times, and as the pattern becomes finer, it becomes difficult to align the patterns more accurately, resulting in misalignment, which results in color misalignment of the electro-optical device, making it extremely difficult to see and clear. The problem was that color display was not possible.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide an electro-optical device that can provide clear color display without color shift even with minute pattern shapes. It's about doing.

[Means to solve the problem]

The electro-optical device of the present invention includes an electro-optic material sandwiched between a pair of substrates, on one of which is a conductive transparent thin film layer formed in an arbitrary pattern, and on the conductive transparent thin film layer. A special embodiment characterized in that a color filter having a colored layer made of an electrodeposited coating film was disposed] Examples will be described in detail below.

Figures 2 and 3 show a method of manufacturing the color filter used in the present invention, in which In, O, or ITO (Int Os +S
A striped electrode 11 is formed using a conductive transparent thin film such as nO□), and after appropriately selected lead wires 12 are connected, the electrode is immersed in an electrodeposition paint 13 containing resin, pigment, and other additives. An electric field is applied between the electrode and the counter electrode 14 to cause a direct current to flow.

Electrodeposition coatings include anionic and cationic electrodeposition coatings.
Depending on the method, positive polarity (anionic electrodeposition coating) or negative polarity (cationic electrodeposition coating) is applied to the object to be coated.

When an electric field is applied, the dissolved or dispersed resin IIs in the electrocoating paint is charged and moves toward the object to be coated, and hydrogen ions and anodes begin to spread near the object to be coated (i.e., electrode 11). It reacts with metal ions (in the case of anionic electrodeposition coating) or hydrogen radical ions (in the case of cationic electrodeposition coating), becomes insoluble in water, and precipitates on the object to be coated.

Next, the substrate 10 is bathed in bath 1! ! After removing the water-soluble thin layer adhering to the surface with water and washing the electrodes 11 with water, the electrodes 11 are selected as appropriate from the unpainted electrodes 11, the lead wires 12 are connected, and the electrodes are immersed in electrodeposition paints containing different pigments. Then apply other colors by electrodeposition.

By repeating the above steps, a multicolored paint layer is electrodeposited on each electrode and heated to form a W coating film, and then a protective film layer is formed to complete the color filter.

According to the above method, in order to deposit the paint on the electrode, it is necessary to apply an electric field to the electrode, and the paint will not be deposited on other electrodes to which no electric field is applied. A color filter with a fine pattern can be obtained by simply making the pattern finer, and there is no need to perform a photolithography process as in conventional examples (this makes manufacturing easier and lower costs).

In addition, the deposited paint has electrical resistance, and the thicker the paint film, the more current flows ((), and the increase in film thickness is automatically suppressed. As a result, the thickness of the paint film is In this case, the color becomes uniform and less uneven color occurs.

Next, an electro-optical device was constructed by combining the transparent substrate having the color filter formed as described above and another substrate.

In the above embodiment, striped electrodes were described, but the present invention can be applied as long as each electrode can be selected independently.For example, in the case of an active matrix or matrix type in which a switching element such as a TFT is connected to each pixel electrode. In this case, a filter layer of any color can be provided on each pixel electrode.

〔Effect of the invention〕

As described above, according to the present invention, the color display of a high-density, high-definition display device or the like can be made clear without color shift by using a fine pattern.

In addition, since the thickness of the colored layer formed by the electrodeposition coating is very uniform, the cells between the pair of substrates can be made constant over all pixels, which eliminates variations in electro-optic properties and provides excellent color unevenness. A color display can be obtained.

[Brief explanation of the drawing]

FIGS. 1(b) to 1(e) are diagrams showing the manufacturing process of a conventional color filter. 1... Glass substrate 2... Transparent electrode 3... Animal protein award (glue, gelatin, etc.) - 415... Photomask 6... Photoresist 7... Dye 8... Protective layer FIG. 2 and FIG. 3 are diagrams showing one embodiment of a color filter used in the present invention. 10... Transparent substrate 11... Electrode 12... Lead wire 13... Electrodeposition paint 14... Counter electrode 15... Electrodeposited coating film 16... Bathtub - Applicant Seiko Epson Corporation Agent Patent Attorney Lead End Kisanbe (and 1 other person) υV V Figure 1

Claims (1)

[Claims] An electro-optical material is sandwiched between a pair of substrates, and one substrate has a conductive transparent thin film layer formed in an arbitrary pattern, and an electrodeposition coating film formed on the conductive transparent thin film layer. 1. An electro-optical device comprising a color filter having a colored layer consisting of: