JPH06347805A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE:To suppress the generation of uneven color and uneven display by preventing the nonuniformity of the gap in the peripheral part of a pixel region (a). CONSTITUTION:The surface of the pixel region (a) having color filters 4 formed on a first glass substrate 6 is covered with a mask 8 and large-diameter spacers 1 having a large diameter corresponding to the gap of a non-pixel region (b) are sprayed [Fig. (a)]. The surface of the non-pixel region (b) of the first plass substrate 6 is covered with a mask 9 and small-diameter spacers 3 having a diameter corresponding to the gap of the non-pixel region (b) are sprayed [Fig. (b)]. This substrate is adhered to a second plass substrate 7 via a sealing material 5 into which bar-shaped spacers 3 having a diameter corresponding to the gap of the non-pixel region (b) are incorporated. Liquid crystals 10 are injected into the gap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid crystal display device, and more particularly, to a technique for equalizing a cell gap formed between a pixel electrode substrate and a common electrode substrate to prevent color unevenness. .

[0002]

2. Description of the Related Art A liquid crystal display device applies a voltage to the liquid crystal filled between two electrode substrates by the electrodes of the electrode substrates to control the rotation of polarized light passing through the liquid crystal, thereby displaying characters and figures. Therefore, if uniformity in the gap between the substrates cannot be ensured, problems such as display unevenness and color unevenness occur. Therefore, it is extremely important to bond both electrode substrates with a uniform gap in a liquid crystal display device. Conventionally, a spherical spacer having a diameter corresponding to the cell gap of a pixel region is dispersed on the surface of one electrode substrate formed by forming a transparent electrode on a glass substrate, and then this substrate and the other electrode substrate are non-pixelated. The electrodes are pasted together with a sealing material mixed with a rod-shaped spacer having a diameter corresponding to the cell gap of the region, thereby holding the gap between both electrode substrates.

FIG. 4 is a part of a sectional view of the liquid crystal cell thus formed. As shown in the figure, a first glass substrate 6 on which a color filter 4 and a common electrode (not shown) are formed, and a second glass substrate 7 on which thin film transistors and pixel electrodes (neither are shown) are formed. Is bonded by a sealing material 5, and the gap between both substrates is filled with the liquid crystal 10. However, between the two substrates, a spherical spacer 2 having a diameter corresponding to the gap of the pixel region a in the pixel region a is formed. Bar-shaped spacers 3 that are arranged and have a diameter corresponding to the gap of the non-pixel region b are arranged at the substrate adhesion portion of the non-pixel region b, and the gap between the substrates is held by these.

In addition, a large-diameter spherical spacer corresponding to the cell gap is dispersed on one of the substrates, then bonded to the other substrate to form an empty cell, and a liquid crystal containing a small-diameter spherical spacer is mixed therein. A method has also been proposed in which a small-diameter spacer is spread over a sparse portion of the large-diameter spacer by injection, and the cell gap is regulated by complementing the small-diameter spacer and the large-diameter spacer (Japanese Patent Laid-Open No. 1-2222).
No. 22).

[0005]

In the conventional example shown in FIG. 4, spacers having the same diameter are arranged in the pixel region and the non-pixel region, but the gap between the two glass substrates is 6 to 8 μm.
The thickness of the color filter is 1 to
Since it reaches 3 μm, when a spacer having the same diameter as that of the pixel region is arranged in the non-pixel region as described above, as shown in FIG. turn into. Because of that,
It is not possible to maintain a predetermined gap even in the peripheral portion of the pixel region, resulting in uneven display and uneven color.

Further, a method of injecting a liquid crystal containing a small-diameter spacer (Japanese Patent Laid-Open No. 1-222222)
Since the diameter of the large-diameter spacer is set according to the gap of the pixel region, it is unavoidable to narrow the gap in the non-pixel region described above, and even in the peripheral portion of the pixel region where color unevenness occurs. Even though the small-diameter spacers could be spread over the entire area, the lack of gap there was not solved, and the problem of color unevenness could not be solved.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a pixel region is formed in the central portion and a non-pixel region is provided in the peripheral portion. ,
Covering the pixel area portion with a mask and spraying a first spherical spacer; and spraying a second spherical spacer having a diameter smaller than that of the first spherical spacer on at least the pixel area portion; There is provided a method of manufacturing a liquid crystal display device, which comprises the steps of: adhering the substrate and the second substrate which forms a pair with the substrate through a minute gap; and injecting liquid crystal into the minute gap. Alternatively, among the above steps, the step of spraying the second spherical spacers having a small diameter may be omitted,
Alternatively, the second spherical spacer may be mixed in the injected liquid crystal.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1A to 1D are process cross-sectional views for explaining a method of manufacturing a liquid crystal display device according to a first embodiment of the present invention. In carrying out the present invention, a common electrode substrate having a color filter 4 and a common electrode (not shown) formed on a first glass substrate 6, and a thin film transistor and a pixel electrode (both of which are provided on a second glass substrate 7). And a pixel electrode substrate (not shown) are prepared. Then, before assembling into a liquid crystal panel, an alignment film is applied on both substrates and an alignment treatment is performed by rubbing.

In assembling the panel, first, referring to FIG.
(A), the pixel area a of the common electrode substrate (first glass substrate 6) is covered with a pixel area mask 8 made of stainless steel, and a large spherical spherical spacer 1 made of glass having a diameter of 7.0 μm is formed. Sprinkle on. In the spraying step, the spacers 1 are pressure-fed by nitrogen gas to dispose the spacers only on the non-pixel regions b of the glass substrate 6.

Next, as shown in FIG. 1 (b), the non-pixel region b of the first glass substrate 6 is covered with a non-pixel region mask 9 made of stainless steel, and made of glass having a diameter of 5.0 μm. Scatter the small diameter spherical spacers 2. Also in this spraying step, the spacers 2 are pressure-fed with nitrogen gas, and the small-diameter spherical spacers 2 are arranged only on the first pixel regions a.

Next, as shown in FIG. 1 (c), a rod-shaped spacer 3 made of glass and having a diameter of 7.0 μm is mixed on the second glass substrate 7 having been subjected to the orientation treatment by a printing method. Applying the sealing material 5 made of epoxy resin, the first and second
The glass substrates 6 and 7 are bonded together. Then, the liquid crystal 10 is injected by the impregnation method and the injection hole is sealed to complete the liquid crystal cell.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2 (a) to 2 (c). In this embodiment, the process of FIG. 2A is similar to the process of the first embodiment shown in FIG. 1A, and the process of the first glass substrate 6 is performed by this process. The large-diameter spherical spacer 1 is arranged only on the non-pixel region b. Next, as shown in FIG. 2B, the small-diameter spherical spacers 2 are scattered without using a mask. As a result, only the small diameter spherical spacers 2 are arranged on the pixel area a, and the large diameter spherical spacers 1 and the small diameter spherical spacers 2 are mixed on the non-pixel area. After that, as shown in FIG. 2C, the first and second glass substrates 6 and 7 are adhered to each other through the sealing material 5 in which the rod-shaped spacer 3 is mixed, and the liquid crystal 10 is injected, and then the liquid crystal is injected. The hole is sealed to complete the manufacturing process according to this embodiment.

Next, a third embodiment of the present invention will be described with reference to FIGS. 3 (a) to 3 (c). In this embodiment, the process of FIG. 3A is similar to the process of the first embodiment shown in FIG. 1A, and the process of the first glass substrate 6 is performed by this process. The large-diameter spherical spacer 1 is arranged only on the non-pixel region b. After that, as shown in FIG. 3B, the first and second glass substrates 6 and 7 are bonded via the sealing material 5 in which the rod-shaped spacer 3 is mixed, and subsequently,
As shown in FIG. 3C, the liquid crystal 10 to which the small-diameter spherical spacers 2 with a diameter of 5.0 μm are added is injected, and the liquid crystal injection hole is sealed to complete the manufacturing process according to the present embodiment.

The preferred embodiment has been described above.
The present invention is not limited to these examples, and various modifications can be made within the scope of the present invention described in the claims. For example, each spacer can be made of resin, and the spraying method can also be such that the small-diameter spherical spacers are sprayed and then the large-diameter spherical spacers are sprayed. Further, the present invention can be applied not only to the active matrix type color liquid crystal display device but also to other liquid crystal display devices such as a simple matrix type.

[0015]

As described above, according to the method of manufacturing a liquid crystal display device of the present invention, it is possible to dispose only small-diameter spacers in pixel regions and large-diameter spacers in non-pixel regions. Therefore, the gap between the two glass substrates can be kept constant by compensating for the difference in film thickness between the pixel region and the non-pixel region. Therefore, according to the present invention, it is possible to prevent display unevenness and color unevenness in the peripheral portion of the pixel region, which are caused by the narrowing of the gap in the non-pixel region, and to provide a liquid crystal display device having excellent display quality. Can be provided.

[Brief description of drawings]

FIG. 1 is a process sectional view for explaining a manufacturing method according to a first embodiment of the present invention.

FIG. 2 is a process sectional view for explaining a manufacturing method according to a second embodiment of the present invention.

FIG. 3 is a process sectional view for explaining a manufacturing method according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a liquid crystal display device manufactured by a conventional example.

[Explanation of symbols]

 1 Large-diameter spherical spacer 2 Small-diameter spherical spacer 3 Rod-shaped spacer 4 Color filter 5 Sealing material 6 First glass substrate 7 Second glass substrate 8 Pixel region mask 9 Non-pixel region mask 10 Liquid crystal a Pixel region b Non-pixel region

Claims (3)

[Claims] 1. A step of spraying a first spherical spacer on a first substrate in which a pixel region is formed in a central portion and a non-pixel region is provided in a peripheral portion, by covering the pixel region portion with a mask. , A step of covering the non-pixel region portion with a mask and spraying a second spherical spacer having a diameter smaller than that of the first spherical spacer; and a step of finely dividing the first substrate and the second substrate paired therewith. A method for manufacturing a liquid crystal display device, comprising: a step of adhering through a gap; and a step of injecting liquid crystal into the minute gap. 2. A step of spraying a first spherical spacer on a first substrate in which a pixel region is formed in a central portion and a non-pixel region is provided in a peripheral portion, by covering the pixel region portion with a mask. Spreading a second spherical spacer having a smaller diameter than the first spherical spacer over the first substrate,
A method of manufacturing a liquid crystal display device, comprising: adhering the first substrate and a second substrate paired with the first substrate via a minute gap; and injecting liquid crystal into the minute gap. 3. A step of covering the pixel area portion with a mask and spraying a first spherical spacer on a first substrate having a pixel area formed in the central portion and a non-pixel area provided in the peripheral portion, A step of adhering the first substrate and a second substrate paired with the first substrate through a minute gap, and adding a second spherical spacer having a diameter smaller than that of the first spherical spacer into the minute gap. And a step of injecting the prepared liquid crystal.