JPH02162324A - Color liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent the overlap of colors and color slurring according to visual angles by constituting a substrate on a color filter disposition side of a plastic film or thin glass sheet having <=0.5mm thickness and providing color filters on the outer side of the substrate. CONSTITUTION:A transparent conductive film 2 consisting of ITO and an oriented film 3 are formed on the inner side of a glass substrate 1. A transparent conductive film 12 consisting of the ITO and an oriented film 13 are formed on the inner side of a plastic film substrate 11. The color filters 5 are respectively formed on the outer sides thereof. A liquid crystal 4 is crimped between the two substrates 1 and 11 and a low-temp. sealant which can join the substrates 1, 11 at <=100 deg.C is preferably used for joining the two substrates to prevent the generation of strains by a difference in the thermal expansion and contraction of the two substrates 1, 11 at the time of joining. Even if the color film 5 is formed on the outer side of the substrate 11, the thickness of the substrate 11 is as thin as about 10mum and, therefore, the problems, such as the generation of a parallax by the thickness of the substrate 11 and the overlap of colors, do not arise.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a color liquid crystal display element.

[Conventional technology]

In recent years, color filters consisting of the three primary colors of red, green, and blue have been used to display liquid crystal displays in computer terminals, etc.
2. Description of the Related Art Color displays on liquid crystal TV devices and the like are being implemented.

An example of the configuration of a conventional color liquid crystal display element applied to this type of device is shown in cross-section in FIG. 21 in Figure 2
, 31 are glass substrates, and on the inner surface of the glass substrate 21, a transparent conductive film 22 made of ITO and an alignment film 23 are provided. On the other hand, I
A transparent conductive film 32 made of TO is provided, a color filter 25 is provided thereon, and an M-edge protective film 26 and an alignment film 33 are further provided thereon. Side board 2
A liquid crystal 24 is sandwiched between 1 and 31. Note that conductive microdust adheres to the protective film 26 during device manufacturing, and this causes the color filter 25 and the transparent conductive film 2 to adhere to each other.
2 is provided to prevent electrical short-circuiting and pixel defects in that part (Japanese Patent Laid-Open No. 62-25
5917).

[Problem to be solved by the invention]

However, the above conventional technology has the following problems.

In the conventional color liquid crystal display element, the color filter 25 is formed inside the substrate 31 (on the side in contact with the liquid crystal 24) as described above. This is for the following reasons. That is, in the conventional color liquid crystal display element, the substrate 3
Since a glass plate with a thickness of 0.8 to 1.1 mm is usually used for 1, the outside of the substrate 31 (the side not in contact with the liquid crystal 24)
If a color filter is installed on the screen, when a fine color pattern is formed, colors may overlap due to parallax when viewed from an oblique angle, or misalignment with the liquid crystal pixels may occur, making it impossible to obtain a clear image. . Therefore, the color filter had to be formed inside the substrate 31. However, if the color filter is formed inside the substrate 31, the problem of pixel defects as described above will occur, so it is necessary to provide the protective film 26 to prevent this. This is undesirable because it increases the number of manufacturing steps and increases the cost of 1~.

The present invention has been made in order to solve the problems of the prior art, and provides a high-quality color liquid crystal display element that can prevent color overlap and color misalignment that would otherwise occur due to viewing angles, without increasing the number of manufacturing steps. The purpose is to

[Means to solve the problem]

In order to achieve the second object, according to the present invention, a liquid crystal is sandwiched between at least two substrates having transparent conductive films,
Furthermore, in a color liquid crystal display element provided with a color filter, at least the substrate on the side where the color filter is provided is a plastic film or has a thickness of 0.
A color liquid crystal display element is provided, which is made of a glass thin plate of 5 mm or less and is characterized in that the color filter is disposed on the side of the substrate not in contact with the liquid crystal layer.

[Effect]

By configuring the substrate on the side where the color filter is installed with a plastic film or a glass substrate with a thickness of 0.5 mm or less, there is no overlap in color depending on the viewing angle even if the color filter is placed on the outside of the substrate (on the side not in contact with the liquid crystal). , colors will no longer be blurred and you will be able to obtain clearer images. Therefore, it is not necessary to form a protective layer as in the conventional method, so that a high quality color liquid crystal display element can be provided with fewer manufacturing steps.

〔Example〕

The present invention will be explained in more detail below with reference to Examples.

FIG. 1 is a sectional view showing the structure of a color liquid crystal display element according to an embodiment of the present invention. In Fig. 1, 1 is a glass substrate, 1
1 is a plastic film substrate.

A transparent conductive film 2 made of ITO and an alignment film 3 are formed on the inside of the substrate 1, a transparent conductive film 12 and an alignment film 13 made of 11゛0 are formed on the inside of the plastic film substrate 11, and a color filter is formed on the outside thereof. 5 are formed respectively. A liquid crystal 4 is sandwiched between both substrates 1 and 11.

2, instead of the plastic film substrate 1, a thin glass plate having a thickness of 0.5 mm or less can also be used. Note that in consideration of substrate damage, cell gap control, etc., a plastic film is more preferably used than a glass thin plate. This is because when a plastic film is used, when the liquid crystal is sandwiched between two substrates, the surface tension of the liquid crystal acts, and the flexibility of the plastic film makes it easy to control the cell gap. This is because there is less damage caused by handling.

In the present invention, materials such as polyester, polyethersulfone, polycarbonate, polyimide, polymethyl methacrylate, etc. can be used as the plastic film 11 for the substrate.

On the other hand, although a glass plate is used as the substrate 1 in the above example, a plastic film similar to the substrate 11 may be used instead of the glass plate. In addition, in this case, TP
When considering high-capacity display liquid crystal driving using active matrix elements such as TFI' and MIM, it is possible to arrange TFI' and MIM on a plastic film due to fine wiring and film formation temperature during element formation. This will be a little more difficult than installing the second glass plate.

Further, for bonding the glass substrate 1 and the plastic film substrate 11, it is preferable to use a sealing agent that can be bonded at low temperatures (below 00°C). By using a sealant that can be bonded at low humidity, the surrounding substrates 1 and 11 can be bonded at low humidity.
The generation of distortion due to differences in thermal expansion and contraction can be prevented. Examples of such sealants include low-temperature curing epoxy resins,
In the color liquid crystal display element having the dual structure of ``ultraviolet curing resin and hot melt'', even if the color filter 5 is formed on the outside of the plastic substrate 11, the thickness of the plastic film substrate 11 is as thin as about 100 μm, so the thickness of the substrate is There are no problems such as parallax or overlapping colors. In addition, since the color filter 5 can be formed on the outside of the plastic film substrate 11, the color filter 5 does not come into contact with the liquid crystal 4, so there is no deterioration of the color filter 5 due to the liquid crystal 4, no generation of microdust due to the color filter 5, and no color change. It has good reproducibility, eliminates pixel defects caused by microdust, and can be expected to improve display quality and yield.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and changes are possible. For example, a color filter is placed on a plastic film, this color filter is coated with resin to give it smoothness, and a polarizing plate is attached to it.
A color liquid crystal display element whose cell gap can be more easily controlled can also be provided.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the substrate on the side where the color filter is disposed is composed of a plastic film or a thin glass plate having a thickness of 0.5 mm or less, and
Since the color filter is arranged on the outside of this substrate (on the side not in contact with the liquid crystal), the following effects can be obtained.

■The visibility of color display colors can be improved, and color overlap and color blurring due to viewing angles can be prevented.

■Production steps are reduced because there is no need to form a protective film.

■ Eliminates deterioration of color filters caused by liquid crystals.

■Using a plastic film for the substrate makes it easier to control the cell gap over a large area (surface polishing may be required for glass substrates).

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a color liquid crystal display element according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the structure of a conventional color liquid crystal display element. Glass substrates 2, 12... Transparent electrosensitive films 3, 13... Alignment film 4 - Liquid crystal 5 - Color filter 1 Plastic film substrate Patent applicant Rico Co., Ltd.

Claims (1)

[Claims] (1) In a color liquid crystal display element in which a liquid crystal is sandwiched between at least two substrates having transparent conductive films and further provided with a color filter, at least the substrate on the side where the color filter is provided is a plastic film or thick 1. A color liquid crystal display element comprising a thin glass plate of 0.5 mm or less in size, the color filter being disposed on the side of the substrate not in contact with the liquid crystal layer.