JP2616754B2 - Liquid crystal device manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a liquid crystal device.

[0002]

2. Description of the Related Art A conventional liquid crystal display device and a method of manufacturing the same will be described with reference to FIG. First, as shown in FIG. 1A, as a means for controlling the electro-optical effect of a liquid crystal, a gap control material 2 is sprayed on the entire surface of a transparent substrate 1 on which a polysilicon thin film transistor (TFT) 5 is formed in a matrix form. Counter substrate 7 having common electrode 6 formed on the entire surface
The seal material 3 is printed thereon. Next, as shown in FIG. 2B, the pair of substrates are bonded to each other, and then, as shown in FIG. Was held by the gap control material sprayed on the entire surface.

[0003]

However, the above-mentioned prior art has a problem that a thin film transistor is destroyed and a pixel defect occurs because a load is applied to the gap control material scattered over the entire surface of the substrate and pressed. . Further, since the liquid crystal is not filled in the area where the gap control material is scattered, and optical switching is not performed by the electro-optical effect of the liquid crystal, there is a problem that a contrast ratio is lowered and a display is rough.

The present invention has been made to solve the above problems, and has as its object to eliminate the occurrence of pixel defects due to the destruction of a thin film transistor and to obtain a rough display having a high contrast ratio. It is in.

[0005]

A method of manufacturing a liquid crystal device according to the present invention is a method of manufacturing a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates. Applying a sealing material mixed with a gap control material to the first substrate, and arranging a plurality of second substrates to be the other substrates of the liquid crystal device on the first substrate so as to face the first substrate via the sealing material, respectively. Causing the first and second substrates to be opposed to each other by pressing means, and dicing the first substrate into a plurality of liquid crystal devices corresponding to the plurality of second substrates. In the pressing step, the substrate on one side of the first and second substrates disposed opposite to each other, the outside of the substrate only in the area where the sealing material is disposed and the peripheral portion thereof is provided to the pressing means. In contact with the said Outside of the substrate placement region and its peripheral portion only Lumpur material is characterized by comprising pressed. In the method of manufacturing a liquid crystal device according to the present invention, the liquid crystal device is a light valve of a projection type liquid crystal device.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 11) This embodiment will be described with reference to FIG. FIG. 1 is a main process diagram of the liquid crystal display device. First, figure (a)
As described above, a sealing material 3 mixed with a gap control material 2 is screen-printed on a transparent substrate 1 on which polysilicon thin film transistors (TFTs) 5 are formed in a matrix as a means for controlling the electro-optical effect of the liquid crystal. The sealing material is not limited as long as it can bond a pair of substrates without deteriorating the liquid crystal, and examples thereof include an epoxy resin and an ultraviolet curing resin.

Next, as shown in FIG. 1B, the common electrode 6 is bonded to a counter substrate 7 formed on the entire surface. Next, as shown in FIG. 3C, only the sealing material portion is pressed by a crimping jig 4 having only the sealing material portion in a convex shape, so that the substrate 7 and the transparent substrate 1 are bonded to each other, and the gap between the substrates is reduced. A liquid crystal display device was obtained by holding only the seal portion and sealing the liquid crystal.

In this embodiment as described above, only the sealing material is pressed to hold the gap between the substrates with only the sealing portion, which results in poor alignment of the liquid crystal caused by the gap control material and the gap control material. The gap non-uniformity of the liquid crystal display device due to the variation in the distribution can be eliminated, and a display having a uniform, high contrast ratio and no roughness can be obtained. In addition, pixel defects caused by the gap control material were greatly reduced.

(Embodiment 12) This embodiment will be described with reference to FIG. FIG. 3 is a main process diagram of the liquid crystal display device. First, As shown in FIG. 1A, a polysilicon thin film transistor (TFT) is used as a means for controlling the electro-optic effect of a liquid crystal.
A sealing material 3 mixed with a gap control material 2 is screen-printed on a transparent substrate 1 having a matrix 5 formed thereon. Next, as shown in FIG. 2B, the counter substrate 7 having the common electrode formed on the entire surface is bonded to the transparent substrate 1. Next, as shown in FIG. 4C, a spacer 8 formed by cutting paper into a seal shape is placed on the opposing substrate 6, and only the sealing material portion is pressed by the crimping jig 4 to separate the opposing substrate 7 and the transparent substrate 1 from each other. Glue it,
The gap between the substrates is held only by the seal portion.

The spacer 8 is not limited to paper, but may be anything as long as it has an appropriate thickness and can absorb the thickness unevenness of the opposing substrate, for example, rubber, plastic, leather, metal and the like.

Next, a liquid crystal was charged and divided by a dicing method to obtain a liquid crystal display device.

In this embodiment as described above, only the sealing material is pressed and the gap between the substrates is held only by the sealing portion, so that there is no roughness having a uniform and high contrast ratio as in the first embodiment. Display was obtained and pixel defects were greatly reduced.

(Example 13) A projection type display device was produced using the liquid crystal display device produced in Example 2. FIG. 4 shows the configuration of the optical system. Incident light from a halogen lamp 1 with an elliptical spherical mirror is condensed by a lens 2 and made incident on a dichroic mirror 3 to be separated into red (R), green (G), and blue (B) components. The separated components are made to enter the R, G, and B liquid crystal display devices 4 via the mirror 5 and synthesized again by the dichroic mirror 3 to obtain a projected image by the projection lens.

In this embodiment as described above, the use of the liquid crystal display device in which the gap between the substrates is held only by the seal portion makes it possible to eliminate pixel defects, poor alignment and the like caused by the gap control material. As a result, a projection image having a high contrast ratio and having no roughness was obtained.

[0015]

As described above, according to the present invention, only the arrangement region of the sealing material mixed with the gap control material and the outside of the substrate at the peripheral portion thereof are in contact with the pressing means, and the arrangement region of the sealing material and the periphery thereof are provided. By pressing only the outside of the substrate, the pair of substrates can be pressed while suppressing the influence on the central portion (display portion) of the substrate, so that the cell thickness can be made uniform. Disconnection and wiring short-circuit can be prevented. In addition, for forming a plurality of liquid crystal devices, dicing is performed on a plurality of display devices after pressing only a peripheral portion of a sealing material of a substrate to be a plurality of liquid crystal devices. No image display device is obtained.

Further, since the gap control material is not sprayed, the process can be simplified, and destruction of the thin film transistor and short circuit of the wiring can be prevented.

Further, in a liquid crystal display device having an organic film such as a color filter layer, the gap control material does not bite into the organic film and the gap control can be performed only by the gap control material in the seal material. It has the feature that gap control becomes easy.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are main process diagrams of a liquid crystal display device.

FIGS. 2A, 2B, and 2C are main process diagrams of a conventional liquid crystal display device.

FIGS. 3A, 3B, and 3C are main process diagrams of a liquid crystal display device.

FIG. 4 is an optical system configuration diagram of a projection display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Gap control material 5 ... Seal material 4 ... Crimping tool 5 ... Polysilicon thin film transistor (TFT) 6 ... Common electrode 7 ······································································································································································· .Mirror 14 Projection lens

Claims (2)

(57) [Claims] 1. A method of manufacturing a liquid crystal device having a liquid crystal sandwiched between a pair of substrates, wherein a step of applying a sealing material mixed with a gap control material on a first substrate which is one of the substrates of the liquid crystal device. A step of disposing a plurality of second substrates, each serving as the other substrate of the liquid crystal device, on the first substrate to face the first substrate via the sealing material, respectively; A step of pressing the first and second substrates; and a step of dicing the first substrate corresponding to the plurality of second substrates to divide the liquid crystal device into a plurality of liquid crystal devices. The substrate on one side of the arranged first and second substrates is arranged such that the outside of the substrate only in the area where the sealing material is disposed and the periphery thereof is in contact with the pressing means, and only the area where the sealing material is disposed and the periphery thereof. The above group A method for manufacturing a liquid crystal device, wherein the outside of a plate is pressed. 2. The method for manufacturing a liquid crystal device according to claim 1, wherein said liquid crystal device is a light valve of a projection type liquid crystal device.