JPH03166516A - Production of color display device - Google Patents

Abstract

PURPOSE:To prevent the breaking of an electrically conductive transparent film by forming an over coat layer on color filters in a certain region and polishing the resulting color filter substrate from the over coat side. CONSTITUTION:An over coat layer 2 on color filters 1 is formed in the entire region of a substrate 5 except at least the connection terminal part. The resulting color filter substrate is then grounded from the cover coat side 2. Since abrasive cloth is brought into contact with the entire surface of the substrate at the time of grinding, the angular part of the over coat layer 2 is easily grounded and made roundish. When an electrically conductive transparent film 3 is formed on the grounded color filter substrate, the breaking of the film 3 due to step coverage of step part is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to word processors, laptop computers, etc.
The present invention relates to a color display device that can be applied to a wide range of uses.

[Summary of the Invention] The present invention provides a color display device using a color filter, in which an overcoat layer on the color filter is formed in a region wi excluding at least a connection terminal portion of a color filter substrate, and the color is removed from the overcoat surface. By polishing the filter substrate, sharp steps in the overcoat layer are eliminated and disconnection of the transparent conductive film is prevented, thereby providing a method for manufacturing a color display device with higher yield and high flexibility than before.

[Prior art] Color display devices using cocolor filters generally employ a method of forming a transparent conductive film on the color filter in order to improve the W quality. However, when a transparent conductive film is placed directly on a color filter, wrinkles and cracks are likely to occur in the transparent conductive film due to differences in thermal expansion coefficients and problems with adhesion. Therefore, as shown in FIG. 3, an overcoat layer 2 made of epoxy resin or the like is formed as a liffill between the color filter 1 and the transparent conductive layer 3.

However, in the conventional example shown in FIG. 3, since the overcoat layer is also present in the connection terminal portion 4, the reliability of connection with the drive IC is reduced. Therefore, as shown in FIG. 4, the overcoat layer 2 is formed except for the connection terminal portion, and the connection terminal portion 4
A method has been devised in which it is directly formed on the substrate 5.

[Problems to be Solved by the Invention] However, in the latter conventional example, a step 6 is generated in the overcoat layer, so that the transparent conductor tt formed thereon is
Discipline has the problem that the step force is more likely to break. To solve this problem, methods have been devised to soften the B difference by controlling the etching conditions of the overcoat, but each method is difficult to control and the process is complicated. [Means for Solving the TS Problem] In order to solve the above problem, an overcoat layer on the color filter is formed in at least an area excluding the connection terminal portion of the color filter substrate, and the overcoat layer is formed on the color filter substrate from the overcoat surface. Polished. As a result, the level difference in the overcoat layer became gentler, and it was possible to prevent disconnection of the transparent conductive film.

[Function] Since the polishing cloth hits the entire surface of the substrate during polishing, the corners of the steps are easily polished and become rounded. Therefore, even if a transparent conductive film is formed on a polished color filter substrate, breakage due to step force burrs at the stepped portion will not occur. The present invention will be explained in detail with reference to Examples below. [Example 1] This will be explained based on Fig. 1. ■ Color filter 1 and black mask 6 are formed on glass substrate 5 by dyeing method (Fig. 1 (a) L ■ Epoxy resin is applied to a thickness of 3μ■ on color filter 1 using a tinner, and overlay is applied. Form the coating layer 2 (Fig. 1 (b)). ■ Apply resist except for the connection terminal area, and remove the overcoat on the connection terminal area by dry etching (Fig. 1 (c)). ■ Overcoat The coated surface is polished until the thickness of the pus becomes 2 μ- (Fig. 1(d)).

■A transparent conductor plate 3 is formed by sputtering and patterned into the required shape (Fig. 1(e)). Using the color filter substrate obtained through the above steps, a liquid crystal display device was fabricated as shown in Figure 2. As a result, transparent conductive IE
It was possible to manufacture a highly reliable display device with no III disconnection at a high yield.

[Example 2] On a glass substrate: A color filter was formed by a printing method. With the printing method, it is difficult to control the color filter thickness, and there is generally a variation of 1.5 to 3.0 μm.
Even after forming the overcoat layer, there were considerable irregularities, but by polishing, we were able to soften the stepped portions of the overcoat and flatten the surface, which not only improved yield but also improved display quality. We were able to achieve this together.

[Example 3] A color filter was formed on a glass substrate by a capacitor method. As a result, as in Example 1, a highly reliable display device with no disconnection of the transparent conductive film could be manufactured at a high yield.

[Effects of the Invention] As explained in detail above, the present invention provides a color display device using a color filter, in which an overcoat layer on the color filter is formed on a region of the color filter substrate excluding at least the connection terminal portion. A method for producing a color display device with higher yield and reliability than before by eliminating sudden steps in the overcoat layer and preventing disconnection of the transparent conductive layer by using an extremely simple method of polishing the color filter substrate from the surface. It provides the following. Furthermore, since the overcoat surface can be flattened at the same time by polishing, it is also possible to use manufacturing methods such as printing methods that have large variations in color and filter film thickness, which is especially important for high-quality liquid crystal display devices. The present invention provides a manufacturing method capable of manufacturing a commercially available color display device at a high yield.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing the manufacturing process of a color display device according to the present invention, Fig. 2 is a schematic cross-sectional view of an embodiment of a color display device using the present invention, and Figs. 1 shows a schematic cross-sectional view of a display device. 1...Color filter 2...Overcoat layer 3...Transparent conductive film 4...Connection terminal portion 5...Glass substrate 6...Black More than a mask

Claims (1)

[Claims] In a method for manufacturing a color display device using a color filter substrate having a color filter layer, an overcoat layer, and a transparent conductive film formed thereon, the overcoat layer is applied to an area of the color filter substrate excluding at least a connecting terminal portion. 1. A method for manufacturing a color display device, which comprises polishing the color filter substrate from the overcoat surface.