JPH0614262B2 - Liquid crystal display manufacturing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the gap between the array glass substrate and the color filter substrate in the step of mounting the color filter substrate on the array glass substrate to make the liquid crystal sensitivity uniform. The present invention relates to a spacer forming method.

Configuration of conventional example and its problems Liquid crystal display devices include clocks, calculators, pocket computers,
It is used as a display device for televisions and the like, and is expected to spread in the future.

Next, a liquid crystal television currently being developed will be described as a conventional example. FIG. 1 shows a schematic sectional view thereof.

On the surface of the array glass substrate 1, a patterned transparent electrode 2 and an alignment film 3 using an alignment agent are formed. On the other hand, in the color filter substrate 4, a mosaic or striped filter film 6 is formed on an optical glass substrate 5, and a transparent electrode 2 and an alignment film 3 are further formed on the filter film 6.

Currently, an organic filter is often used as a filter material corresponding to the color filter film of the color filter substrate 4, which is formed on an optical glass substrate separately from the array glass substrate as shown in FIG. The transparent electrodes are aligned and held on the array glass substrate with the liquid crystal material 7 in between.

In this case, it is necessary to make the liquid crystal layer gap between the opposing electrodes uniform in order to equalize the gradation and contrast depending on the liquid crystal material used.

As a means for providing the liquid crystal layer gap 8, there is a method shown in FIG. As shown in Fig. a, a constant diameter (for example, 6 to 7μ)
mφ) with a columnar or spherical spacer material 9 added, for example, an epoxy adhesive 10 is used to weld and fix the end portions of the color filter substrate and the end portion of the array glass substrate by welding (see FIG. b). ), And inject the liquid crystal material 7 (see FIG. C). In this case, the adhesive 10 is pressed by applying pressure from the upper portion of the filter substrate, and the spacer material 9 serves as a liquid crystal layer gap control material, and a gap of 6 to 7 μm corresponding to the diameter of the spacer material 9 of 6 to 7 μm φ. Is obtained.

According to this method, in the case of a large-area substrate, the ends are bonded and fixed, so that when it is pressed from the outside to the center of the color filter substrate, as shown in FIG. The transparent electrode on the side and the transparent electrode on the side of the color filter substrate are short-circuited, which causes malfunction. Further, at this time, the display becomes uneven as shown in FIG. 3b.

Therefore, as shown in FIG. 4, before adhering the array glass substrate and the filter substrate, either the array glass substrate 1 or the filter substrate 4 has the same diameter or a small diameter (for example, 5 to 6 μmφ) as the spacer material 9. After the spacer material 11 is dispersed and applied (see FIG. A), the array glass substrate and the color filter substrate are bonded and fixed in the same process as described above (b,
(See FIG. c), a method of injecting a liquid crystal material is used (d)
See figure). In this case, the spacer material 11 in the liquid crystal layer is non-uniformly present on the array glass substrate or the color filter substrate, or moves when the liquid crystal material is injected, and bubbles 12
There was a problem such as remaining.

OBJECT OF THE INVENTION The present invention has been invented to solve these problems,
Especially for large liquid crystal display devices, by providing fixed spacers, a uniform and stable liquid crystal gap can be obtained, unevenness due to the spacer material and short circuit between opposing electrodes can be prevented, and liquid crystal orientation is not impaired and liquid crystal injection is performed. The purpose is to prevent remaining bubbles.

Structure of the Invention The present invention, when manufacturing a liquid crystal display device having an array glass substrate, a liquid crystal layer, and a mosaic or stripe color filter substrate, on the array glass substrate or the filter substrate, a spacer material in advance. Addition, applying a UV-curable resin diluted with a solvent, irradiating UV through a photomask, and removing the UV-unirradiated portion of the resin to control the liquid crystal layer gap at a predetermined position. A step of forming a film of the resin that is thinner than the spacer material and becomes thicker toward a side portion while leaving the spacer material in a stripe shape; and a step of forming an alignment film on the resin. A method for manufacturing a liquid crystal display device.

Description of Embodiments An embodiment of the present invention for forming spacers provided on a filter substrate will be described with reference to FIG.

On the color filter 4, a spacer material 11 having a smaller diameter (for example, 5 to 6 μmφ) than the spacer material used for the seal portion is added in advance, and the diluted ultraviolet curable resin 13 is applied (see FIG. A). In the dilution, the resin after curing is thinner than the spacer material, and the residual resin amount fills the lower periphery of the spacer material,
In addition, the thickness of the spacer material is increased as it approaches the sides of the spacer material. This can be realized by adjusting the degree of dilution and evaporating the solvent of the diluent resin by prebaking in the photo-slurry process. For example, ultraviolet rays 15 are emitted as light through the photomask 14 (see FIG. B). Next, the portions not irradiated with ultraviolet rays are removed by development, and the portions irradiated with ultraviolet rays remain as spacers (see FIG. C). The exposure and development process is performed to form a spacer at a predetermined position. An enlarged view of part A of FIG. 5c is shown in FIG. 5d.
The resin 13 thus diluted with the solvent is formed along the side portion of the spacer material 11 as a spacer material fixing film, and the resin 13 surely fills the lower portion of the spacer material 11 and the spacer material 11 side. It is formed in a shape that becomes thicker as it approaches the portion. Then, the alignment film 3 is formed on the resin 13 as shown in FIG. 5d. Therefore, the alignment film can be formed on the entire surface of the substrate except the spacer material.

The spacers on the color filter substrate 4 are formed in stripes regardless of the color filter pattern. Due to the formation of the stripe-shaped spacers and the above-described shape of the residual resin, the liquid crystal material can be easily injected, and the bubbles can be easily removed, and the residual can be reduced.

Using the color filter substrate 4 thus formed with spacers at predetermined positions, using the epoxy adhesive 10 with the spacer material 9 added as described in the conventional example, the filter substrate end and the array glass substrate end are used. The part is adhesively sealed. Then, the liquid crystal material 7 is injected to complete the liquid crystal display device. (See FIG. 6) Effect of the Invention The present invention is erroneous due to a short circuit between the transparent electrode on the side of the array glass substrate and the transparent electrode on the side of the filter substrate, which has occurred in a large-area substrate, display unevenness due to uneven gap, In addition to solving the conventional problems such as non-uniformity of spacer material dispersion and prevention of display defects due to movement of spacer material when injecting liquid crystal material, further, the spacer material of arbitrary diameter and diluted ultraviolet light are used in forming the spacer. A spacer having a predetermined thickness can be provided at a predetermined position by using a curable resin. Further, in order to obtain the liquid crystal layer gap having a predetermined thickness, the spacer having a predetermined thickness can be easily formed by selecting the diameter of the spacer material. Further, since the present invention uses the dilute resin coating, the residual resin thickness can be made thin and the resin film thickness can be easily controlled. A small amount of the ultraviolet curable resin is used as a spacer material fixing agent along the spacer material side portions along the spacer material. It can be reliably filled below the material and can be thicker as it approaches the sides of the spacer material. Since the spacer material is left in such a resin shape and stripe shape, good liquid crystal injection is possible, and no bubbles remain in the liquid crystal injection, so that a high-performance liquid crystal display device can be realized.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a conventional liquid crystal display device, and FIGS.
c is a process sectional view showing a spacer forming method only for a seal portion by a conventional method, FIGS. 3A and 3B are sectional views showing an example of the problem, a plan view, and FIGS. 4A to 4D are spacer material dispersion methods. Process sectional views of a method using a conventional seal portion spacer forming method,
5A to 5D are sectional views showing a process of forming a fixed spacer according to an embodiment of the present invention, and FIG. 6 is a schematic sectional view of a liquid crystal display device mounted by using a color filter having a spacer formed by the method of the present invention. is there. 3 ... Alignment film, 4 ... Filter substrate 11 ... Spacer material, 13 ... UV curable resin 14 ... Photomask, 15 ... UV ray

Claims (1)

[Claims] 1. When manufacturing a liquid crystal display device having an array glass substrate, a liquid crystal layer, and a mosaic or striped color filter substrate, a spacer material is added in advance on the array glass substrate or the filter substrate. , Apply UV curable resin diluted with solvent,
The step of irradiating ultraviolet rays through a photomask and the removal of the portion of the resin not irradiated with ultraviolet rays leave the spacer material for controlling the liquid crystal layer gap in a stripe shape at a predetermined position, and the side portions of the spacer material. And a step of forming a film of the resin that is thinner than the spacer material and becomes thicker toward the side portion, and a step of forming an alignment film on the resin. Method.