JPH02210329A - lcd display panel - Google Patents

Abstract

PURPOSE:To equalize a gap between an upper and a lower electrodes and to contrive the improvement of a display quality by prescribing the gap between the upper and the lower electrodes with the thickness of an island-like spacer formed on the upper substrate or the lower substrate or both of them. CONSTITUTION:An active element part 14 and an oriented film 15 are formed on the lower substrate 12 in the same way as a picture element electrode 13. On the upper substrate 11, a counter electrode 18 and an oriented film 19 are formed, and the upper substrate 11 and the lower substrate 12 are adhered with an epoxy resin by pinching an island-like spacer 16 like a sandwich. Since photopolymer is used as the material of the island-like spacer 16, thickness can be controlled easily, the manufacturing process becomes easy, and the uniformity of a gap between the substrates can be contrived. In such a manner, the display characteristic is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display panel, and in particular to a method for defining a gap between upper and lower substrates of a liquid crystal display panel, shortening the response time of a liquid crystal display device, and improving controllability. 1-This invention relates to a liquid crystal display panel using island-shaped spacers suitable for improving last and gradation characteristics.

[Conventional technology]

In the conventional structure of a liquid crystal display panel, a spacer material made of glass fine particles or glass fibers is dispersed inside the liquid crystal layer to define the gap between the substrates of the liquid crystal display panel. That is, as shown in FIG. 3, a sealing material in which glass fine particles are dispersed as a spacer material is printed on the periphery of the upper substrate 31 on which the striped electrodes 34 and the alignment film 35 are formed, and then the lower substrate 3
2, a spacer material 33 of glass particles is dispersed therein. after that,
The upper substrate 31 is placed on the lower substrate 32, the upper and lower substrates 3.1.32 are bonded together by applying pressure, a liquid crystal material is injected inside to form a liquid crystal layer, and the pores are sealed with epoxy resin to form a liquid crystal display panel. was making.

In addition, as an example of improving this, JP-A-62-1988
As shown in Publication No. 25, striped protrusions are formed on the surfaces of the upper and lower substrates, and when the upper and lower substrates are stacked, the intersecting parts of the striped protrusions fill the gap between the upper and lower substrates. It was supposed to be regulated. That is, as shown in FIG. 4, striped ITO electrodes 4 are formed on upper and lower substrates 41 and 42 on which striped convex portions 43 are formed, respectively.
After forming the upper and lower substrates 41.4 and performing orientation treatment on the upper and lower substrates 41.42, a sealing material is applied to one substrate surface, and the upper and lower substrates 41.4 are aligned.
2 were stacked on top of each other and bonded together under pressure, and a liquid crystal display panel was then produced in the same manner as in the past.

[Problem to be solved by the invention]

In a structure in which glass fine particles are dispersed as a spacer material as in the above-mentioned prior art, if the diameter of the glass fine particles is set to 4 μm or less, the manufacturing method becomes expensive. In addition, when the gap between the upper and lower substrates is set to 1 to 3μ, static electricity generated on the substrate tends to cause uneven distribution of the spacer material with a gap of 1 to 3μ or overlap between spacer materials, resulting in uneven gap between the upper and lower substrates. There were other problems.

In addition, in a structure in which striped protrusions are formed on the substrate, the striped protrusions are formed on the substrate by etching the substrate itself, making it difficult to control the length of the gap between the upper and lower substrates, resulting in uneven contrast and gradation. In addition, since no consideration was given to encapsulating the liquid crystal, and the area of the striped protrusions between the substrates is large, the striped protrusions act as a barrier and prevent the liquid crystal from filling. There was a problem that it became difficult to inject.

The first object of the present invention is to solve the above-mentioned problems of the conventional technology, and by equalizing the gap between the upper and lower substrates, it is possible to eliminate unevenness in contrast and gradation, and to improve display quality. Our objective is to provide liquid crystal display panels.

The second purpose is to make it easier to control the size of the gap between the substrates, to shorten the response time by making the gap smaller than before, and to make it easier to encapsulate the liquid crystal by reducing the spacer area between the substrates. Our goal is to provide a liquid crystal display panel that can

[Means to solve the problem]

The above purpose is to fill the gap between the upper and lower substrates with an active element formed on the lower substrate that does not allow light to pass through the upper substrate, the lower substrate, or both, or a wiring connection portion between the active element and the pixel, or a portion corresponding to the wiring. This is achieved by setting the thickness of the island-shaped spacer formed in the thickness of the island.

[For production]

The above-mentioned island spacer defines the width of the gap between the upper and lower substrates. This makes the gap between the upper and lower substrates uniform and eliminates unevenness in contrast and gradation, improving the display quality. Further, by using island-shaped spacers, the size of the gap between the upper and lower electrodes can be easily controlled, and the gap between the electrodes can be made smaller. This makes it possible to increase the response speed of the liquid crystal display panel. In addition, the island spacer occupies a small proportion between the upper and lower substrates, which makes it easier to encapsulate the liquid crystal. Furthermore, since the island spacer is formed on the active element that does not transmit light in the lower substrate,
The island spacer does not interfere with display, and the thickness of the island spacer can be small. Also, if you make the island spacer a little smaller.

It is less likely to protrude from the top of the active element, making alignment easier.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS. 1, 2, and 5.

FIG. 1 is a schematic sectional view showing an embodiment of the liquid crystal display panel of the present invention, and FIG. 2 is a schematic sectional view showing the manufacturing method of FIG. 1 in order of steps.

In FIG. 1, 11 is an upper substrate, 12 is a lower substrate, and 13 is an upper substrate.
A pixel electrode is formed on the lower substrate 12, 14 is an active element portion, and 15 is an alignment film, which, like the pixel electrode 13, is formed on the lower substrate 12.

16 is an island-shaped spacer formed on the alignment film 15, and 17 is a liquid crystal. A counter electrode 18 and an alignment film 19 are provided on the upper substrate 11.
As shown in the figure, an upper substrate 11 and a lower substrate 12 are bonded together with an epoxy resin with island-shaped spacers 16 sandwiched therebetween.

In its manufacturing method, first, as shown in FIG. 2(a), a pixel electrode 13, an active element portion 14, and an alignment film 15 are formed on a lower substrate 12 by a conventional method as shown.

Next, as shown in FIG. 2(b), a photopolymer sheet 20 is bonded onto the alignment film 15 of the lower substrate 12 as shown.

Next, as shown in FIG. 2(c), an exposure mask created so that the island-like spacers 16 are formed is prepared, and the photopolymer sheet 20 is exposed to close contact and developed to form the island-like spacers 1.
After patterning 6, it is post-baked and hardened.

Next, as shown in FIG. 2(d), the surfaces of the upper substrate 11 and the lower substrate 12 on which the counter electrode 18 and the alignment film 19 have been formed are subjected to alignment treatment, and epoxy resin is applied as a sealant to the surface of one of the substrates. is applied to the specified size frame using the screen printing method,
After that, the upper and lower substrates 11 and 12 are overlapped, and the upper and lower substrates 11 and 12 are
The epoxy resin is cured by heat treatment while applying pressure until the alignment film 19 and the island-shaped spacer 16 of the lower substrate 12 come into contact with each other, and the upper and lower substrates 11 and 12 are bonded together. Next, as in the conventional method, liquid crystal 17 is injected and the holes are sealed with epoxy resin, thereby manufacturing the liquid crystal display panel shown in FIG.

According to this example, since a photopolymer is used as the island-shaped spacer material, the thickness can be easily controlled, the manufacturing process is simplified, and the uniformity of the gap between the substrates can be measured, which improves the display characteristics. There is an effect. Further, as shown in FIG. 1, the thickness S of the island-shaped spacer 16 can be easily calculated using the following formula.

S = D −a −p −d ・・・・・・・
...(1) or S=L+p-d...
(2) Here, D: Thickness of the gap between the upper and lower substrates a; Thickness of the counter electrode p1 Thickness of the alignment film d; Sum of the thicknesses of the active element part, pixel electrode, and alignment film L; It can be expressed in terms of thickness. As shown in equations (1) and (2), the thickness S of the island spacer 16 can be reduced by d, resulting in cost reduction.

Furthermore, since the thickness of the photopolymer allows the gap between the upper and lower electrodes to be reduced, the response speed can be increased, allowing application to liquid crystal display panels using ferroelectric liquid crystal. Further, there is an effect that the spacer does not interfere much with liquid crystal filling. Furthermore, since there is no obstruction to the display section by spacers, there is an effect that a liquid crystal display panel with excellent optical properties can be manufactured.

Furthermore, as another embodiment of the present invention, as shown in FIG. A method of forming an island-like spacer 3o at a wiring connection part or a part corresponding to a wiring, and also forming an island-like spacer 30 at the same position as above on both the upper and lower substrates, as shown in FIG. It may be a method.

〔Effect of the invention〕

According to the present invention described above, the gap between the upper and lower electrodes can be defined by the thickness of the island-like spacer formed on the upper substrate, the lower substrate, or both, so that the gap between the upper and lower electrodes becomes uniform, thereby preventing unevenness in contrast and gradation. This improves display quality, makes it easier to control the size of the gap between the upper and lower electrodes, and makes the gap smaller, increasing response speed. It is now possible to manufacture flat-screen display panels, and since the spacer occupies a smaller area between the upper and lower substrates than before, it is easier to encapsulate the liquid crystal, and the spacer can be placed in the active element part of the substrate where light does not pass through. Because of this, the display part is not obstructed, a liquid crystal display panel with excellent optical properties can be manufactured, and the number of manufacturing steps can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the liquid crystal display panel of the present invention, FIG. 2 is a schematic cross-sectional view showing the manufacturing method of FIG. 1 in order of steps, and FIG. 4 is a sectional view of a conventional liquid crystal display panel, and FIG. 5 is a schematic sectional view showing another embodiment of the present invention. 11... Upper substrate, 12... Lower substrate, 13.23...
・Pixel electrode, 14.24...Active element section, 15
゜19.29...Alignment film, 16,30...Island spacer, 17...Liquid crystal, 18.28...Counter electrode, 2
0...Photopolymer sheet. （组） （し） ? 3-Ganadena 24-・Akukoi Ding the 3rd highest? 8-・Counter electrode: zq---Kenkien 3θ・-・Shimajo Smarte

Claims (1)

[Claims] 1. In a liquid crystal display panel in which a spacer is interposed between opposing upper and lower substrates, and a liquid crystal is sealed in a gap formed by bonding the peripheral parts of the upper and lower substrates with a sealing material, the gap between the upper and lower substrates is Thickness of an active element formed on the upper substrate, the lower substrate, or the lower substrate that does not transmit light, or a wiring connection portion between the active element and the pixel, or an island-like spacer formed in a portion corresponding to the wiring. A liquid crystal display panel characterized in that it has a configuration in which settings can be made in different ways.