JPS62919A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To eliminate troubles such as disconnection and short circuits and to obtain an easily visible display with the uniform space by fixing electrodeposited high-polymer spacers to an optional region except a thin film transistor part, multi-layered wiring part and effective display part. CONSTITUTION:The high-polymer spacers 11 are electrodeposited to either of a transparent electrode substrate 8 or a thin film transistor (TFT) substrate 6 in the region except the TFT4 and the multi-layered wiring parts by amorphous silicons 12, 13, a gate insulating film 14 and gate electrode 15 of the substrate 6 and the effective display part of the display part formed by the respective counter electrode 7 and thin film TRs of the substrates 8, 6. The substrates 8, 6 can be therefore press stuck at the desired correct space without affecting the display and display function. The troubles such as the disconnections and short circuits of the TFT and multi-layered wirings are eliminated and the easily visible liquid crystal display is made with high accuracy by the uniform space between the substrates.

Description

[Detailed Description of the Invention] [Industrial Application] This invention is an active matrix type w! in which a display electrode array is constructed using thin film transistors (TPT) as switching elements. Regarding the It crystal display device, in particular, the spacing between the substrates is controlled to prevent deterioration in display quality and failure of the TPT.

[Conventional technology]

Conventionally, the method for controlling the distance 11J between substrates of a liquid crystal display device is to use A I, 0 in the sealing material used for bonding the substrates together.
3. Control the spacing by using a mixture of spacing control materials such as powder, glass beads, and glass fiber, and
A method has been adopted in which a spacing control material such as glass fiber is dispersed within the display surface.

FIG. 5 is a sectional view showing a conventional liquid crystal display device disclosed in Japanese Unexamined Patent Publication No. 55-57821. In FIG. 5, 21 is an upper substrate, 22 is an upper electrode, 23 is a lower substrate, and 24
25 is a lower electrode, 25 is a sealing material, 26 is a polarizing plate, 27 is a liquid crystal, and 28 is an in-plane spacer.

FIG. 6 is a plan view of a TPT array substrate of an active matrix type liquid crystal display device consisting of a TFT array substrate 6 having a TFT array 4 and a counter electrode substrate 8 having a counter electrode 117, and FIG. - It is a sectional view of the X plane.

6 and 7, 1 is a gate electrode line, 2 is a source electrode line, 3 is a drain electrode, 4 is a TPT, 5 is a display electrode, 6 is a TFT array substrate, 7 is a counter electrode, and 8 is a counter electrode. Electrode substrate, 11 is electrodeposited polymer spacer, 12 is amorphous silicon (a-Si(n)), 13 is amorphous silicon (a-Si(i)), 14 is gate insulating film, 15 is gate electrode It is.

Next, a method of dispersing the in-plane spacers 28 shown in FIG. 5 will be explained. For example, a glass fiber with a diameter of 10 μm is cut into a length of about 50 μm, and a mixed solution is prepared using isopropyl alcohol or Freon as a medium. Then, by spraying and dispersing the glass fiber mixture in the form of a mist on one substrate side and press-bonding the substrate with the substrate on which the sealing material 25 is printed, the in-plane spacing of the glass fibers with a diameter of 10 μm can be controlled.

On the other hand, in an active matrix type liquid crystal display device in which a TFT array substrate 6 having a TFT array 4 having a structure as shown in FIGS. 6 and 7 and a counter electrode substrate 8 are combined, the above-described conventional spacer dispersion method is When spraying the entire surface on the counter electrode substrate 8 or TPT substrate 6 using
In-plane spacers 28 are inevitably present on the TPT 4, the multilayer wiring section, and the display electrode 5.

[Problem 3 to be solved by the invention: If the in-plane spacer 28 is present in the TPT 4 or the multilayer wiring part, mechanical stress will be generated when the in-plane spacer 28 is bonded to the opposing 4-pole substrate 8 by pressure bonding 1, resulting in breakage of the TPT 4, etc. There is a problem that the display is difficult to see when it is present on the display electrode 5 of the display section.

This invention was made in order to solve these problems, and is an active matrix type liquid crystal display that can prevent the TFT array from breaking down due to 8m stress and can provide an easy-to-read display with uniform spacing. The purpose is to obtain equipment.

[Means for solving problems]

In the liquid crystal display device according to the present invention, electrodeposited polymers are selectively deposited on either the counter electrode substrate or the TFT array substrate in areas other than the TPT portion, the multilayer wiring portion, and the effective display portion. After forming and fixing spacers, both substrates are bonded together.

[For production]

In this invention, areas corresponding to the TPT portion, multilayer wiring portion, and effective display portion are protected on either the counter electrode substrate or the TFT array substrate, and the areas corresponding to the other transparent electrodes, gate wiring, and source wiring are protected. After forming an opening using a resist pattern, an electrodepositable polymer spacer is formed only in the opening using an electrodeposition method.

〔Example〕

Embodiments of the liquid crystal display device of the present invention will now be described with reference to the drawings. FIG. 1 is a plan view of a TFT array substrate in one embodiment, FIG. 2 shows a resist pattern having an opening formed on the TPT array substrate or the opposing substrate, and FIG. 3 is a plan view of the TFT array substrate in one embodiment. FIG. 2 is a cross-sectional view of an active matrix display device corresponding to the IN-IN plane. FIG. 4 is a conceptual diagram of an electrodeposition method for forming an electrodeposited polymer spacer on a counter electrode substrate.

In FIGS. 1 to 4, 11 is an electrodeposited polymer spacer, 16 is a resist pattern, 17 is an opening in the resist pattern 16, 3 is a drain electrode, and 27 is a liquid crystal.

First, as shown in FIGS. 1 to 3 of FIGS. 1 to 4, a counter electrode 7 made of a transparent conductive film of indium oxide is formed on a glass counter electrode substrate 8 by vapor deposition or sputtering. Form.

Next, apply a positive resist to the entire surface, such as 0FPR-SOO.
(manufactured by Tokyo Ohka Kogyo Co., Ltd.) is applied, exposed using a predetermined photomask, and developed to form a resist pattern 16 shown in FIG.

This resist pattern 16 in FIG. 2 is similar to the TFT in FIG.
TPT4 of the array substrate 6. and multilayer interconnection part, i.e.
Amorphous silicon 12 (a-5i (n)),
Amorphous silicon 13 (a-Si(i)), gate insulation y! 14, multilayer interconnection section with gate electrode 15;
The area corresponding to the area of the display electrode 5 (the shaded area in FIG. 1) is protected, and the area other than the above area, for example, the gate electrode fIi1 is protected.
, or has a predetermined opening corresponding to a portion of the source electrode 2.

Next, as shown in FIG. 4, these members are placed in an electrodeposition tank 20. As the electrodeposition liquid 18, for example, a 1O volume percent aqueous solution of Watersol S-230E-1 (manufactured by Dainippon Ink and Chemicals Co., Ltd.), an anionic electrodepositable melamine resin paint, is used. The transparent conductive film 7 is used as a cathode, and the counter electrode plate 19 for electrodeposition is used as an anode, and DC electrolysis at 20 volts is carried out for 2 to 30 minutes.
When the voltage is applied for 5 minutes, the electrodeposition paint is deposited on the electrodes in the openings 17 of the resist pattern 16.

Next, the glass counter electrode substrate 8 is taken out from the electrodeposition bath 20, and after washing with water, the resist pattern 16 is removed with a stripping solution.
Baking is performed at 0° C. for 30 minutes to form an electrodeposited polymer spacer 11 with a thickness of 10 μm.

The counter electrode substrate 8 on which the electrodeposited polymer spacers 11 are formed is preliminarily screen-printed with an epoxy sealant.
After adjusting the alignment with the FT array substrate 6,
Both substrates were bonded together with the liquid crystal 27 interposed therebetween by thermocompression bonding using O.

As a result, as shown in FIGS. 1 and 3, the electrodeposited polymer spacer 11 can be selectively fixed except for the TFT 4 portion, the multilayer wiring portion, and the effective display portion. At this time, the distance between the TFT array substrate 6 and the counter electrode 8 is 10 μm±1.
It was possible to perform flJl&j with an accuracy of 5 μm.

In the above example, the electrodeposited polymer spacer 11 was formed on the counter electrode substrate 8 (I!!l), but the TFT
When forming electrodeposited polymer spacers on the gate wiring or source wiring on the array substrate 6, the electrodeposited polymer spacer can be formed in the same manner by short-circuiting both electrodes before placing them in the electrodeposition bath 20. Can be formed.

Furthermore, there are various types of coverings for the electrodeposited paint at the beginning of the resist, but it goes without saying that these do not limit the effects of the present invention.

〔Effect of the invention〕

As explained above, the present invention is configured such that an electrodeposited polymer spacer can be selectively formed in any region other than the TPT portion, the multilayer wiring portion, and the effective display portion by the electrodeposition method. Failures such as disconnections and short circuits caused by the spacer Cζ in the wiring area can be eliminated, and since there is no spacer in the effective display area, uniform cell spacing can be controlled without deteriorating display quality, resulting in high precision. It has the effect of getting something.

[Brief explanation of drawings]

FIG. 1 shows T in an embodiment of the liquid crystal display device of the present invention.
A plan view of the FT array substrate, FIG. 2 is a resist pattern having an opening formed on the TFT array substrate or counter substrate side in the same liquid crystal display device, and FIG. 3 corresponds to the IN-IN plane of FIG. 1. Section A, FIG. 4 is a conceptual diagram of the electrodeposition method applied to the liquid crystal display device of the present invention, FIG. 5 is a cross-sectional view of a conventional liquid crystal display device, and FIG. 6 is a TPT array substrate using a conventional spacer fixing method. The plan view of Fig. 7 is the 6th
It is a sectional view corresponding to the XX plane of the figure. 1... Gate electrode line, 2... Source electric S line, 3...
- Drain electrode, 4□...TFT, 5... Display electrode, 61. . TFT array substrate □, 7... Counter electrode, 8... Counter electrode substrate, 11... Electrodeposited polymer spacer, 16...
Resist pattern, 17...Resist opening, 27...Liquid crystal. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a liquid crystal display device comprising a thin film transistor array substrate having a thin film transistor array on its surface, a counter electrode substrate having a transparent counter electrode, and a liquid crystal interposed between both substrates, the counter electrode substrate or the thin film transistor array substrate The thin film transistor array substrate and the counter electrode substrate are bonded together after selectively adhering an electrodeposited polymer spacer to one of them in areas other than the thin film transistor portion, the multilayer wiring portion, and the effective display area. A liquid crystal display device. (2) On the transparent counter electrode coating or gate electrode line,
2. The liquid crystal display device according to claim 1, wherein an opening is formed using a resist pattern on the source electrode line, and electrolysis is applied to form an electrodepositable polymer spacer in the opening.