JPH02287429A - Color liquid crystal display element - Google Patents

Abstract

PURPOSE:To obtain the color liquid crystal display element of a high-grade display while eliminating the leakage of light from a peripheral edge region by forming a light shielding film to a substrate surface region exclusive of a picture element region. CONSTITUTION:The light shielding film 19 is formed to the substrate surface region exclusive of the picture element region. Namely, the light shielding film 19 is formed between individual color filters 5 and on the entire part of the image plane region inclusive of the periphery. The film 19 consists of a metallic thin film consisting of chromium or org. resin film dyed with a black dye. The film is formed by vapor deposition over the entire surface prior to the formation the color filters and is then patterned to prescribed shapes by a photolithographic technique in the case of the metallic thin film. Since the light shielding film is formed even to the peripheral edge part exclusive of the picture element region, the leakage of the light from the peripheral edge part is prevented and the high-display grade is obtd.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to, for example, a display liquid crystal cell in which a liquid crystal is sandwiched between two transparent substrates, and a color liquid crystal display in which chromatic dispersion compensating members made of optically anisotropic bodies are stacked. It is related to the element.

[Prior art]

In recent years, in order to respond to the diversification of information, liquid crystal display elements have been increasing in density and screen size, as well as color display, and various methods have been proposed so far. One of these is the so-called chromatic dispersion-compensated color liquid crystal display element, which combines a chromatic dispersion-compensated super-twist nematic black-and-white display system with fine color filters for the three primary colors of red, green, and blue. .

FIG. 5 is a schematic cross-sectional view of an already proposed color dispersion-compensated color liquid crystal display element, and FIG. 6 is a schematic plan view thereof.

This color liquid crystal display element has a structure in which a display liquid crystal cell A and a chromatic dispersion compensation type liquid crystal cell B are stacked,
According to the display liquid crystal cell A, a liquid crystal layer 3 is sandwiched between two transparent substrates 1.2 made of glass, translucent resin, etc., and a spacer is provided between the two substrates 1.2. A sealant 4 is interposed. Fine color filters 5 are formed on the inner surface of one transparent substrate 2 in a desired pixel arrangement, and a light shielding film 6 is formed in a matrix between the individual filters 5 (pixels). This filter 5 is made of gelatin or the like, and is dyed with any one of the primary colors of red (R), green (G), and blue (B), and each filter 5R15G, 5B corresponding to that color is coated with a film thickness of 2.0 to 2.0. Arrange as shown in FIG. 6 at 3.0 μm. Further, the light shielding film 6 is formed by vacuum depositing a metal such as chromium.

When the color filter 5 is formed, unevenness is formed on the surface of the transparent substrate 2. Therefore, a flattening film 7 is formed to reduce the unevenness and flatten the plate surface.

Next, a transparent electrode 8 is formed in a predetermined shape on the layer 7, and an alignment film 9 is further formed on the electrode 8 to determine the alignment of the liquid crystal molecules.

Furthermore, a transparent electrode 10 and an alignment film 11 are also provided on the transparent substrate l.
are sequentially stacked.

According to the liquid crystal cell B for chromatic dispersion compensation, two transparent substrates 12
, 13, consists of a sealing agent 14 interposed between the substrates 12 and 13 and serving as a spacer, and a liquid crystal layer 15 sandwiched between the substrates 12 and 13; An alignment film 6 for determining the alignment of liquid crystal molecules is formed on the substrate.

Moreover, the optical path difference Δn d (Δn: birefringence of liquid crystal, d: thickness of liquid crystal layer) is optimized for each liquid crystal layer 3, 15 so that optical compensation is complete, and - boat fishing Δn-d to display liquid crystal cell and chromatic dispersion compensation liquid crystal cell B
Δn - d are approximately equal.

Furthermore, a polarizing plate 17.18 is formed on one transparent substrate 2.12 of each liquid crystal cell ^, B.

[Problem that the invention seeks to solve]

However, in the color liquid crystal display element having the above configuration, the pixel area where the color filter 5 is formed corresponds to the peripheral area of the area where the color filter 5 is not formed, that is, the effective screen peripheral area where screen display is possible. The thickness of the liquid crystal layer in each part is the film thickness of the color filter 5 (2,0~
3.011 m), and this caused the following problems in terms of optical compensation.

That is, the optical path difference Δn=d is determined so that the optical compensation is complete in the pixel area, and as a result, the optical compensation in the effective screen peripheral area becomes incomplete, and light leaks from the peripheral area, resulting in poor display quality. There was a problem in that the value decreased significantly.

The present invention was devised in order to eliminate the drawbacks of the prior art as described above, and an object of the present invention is to provide a color liquid crystal display element with high quality display.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has a liquid crystal sandwiched between two transparent substrates to form a screen of a predetermined shape, and a large number of color filters serving as pixels are placed on the inner surface of the substrates, and are interposed between the filters. A color liquid crystal display element comprising a display liquid crystal cell on which a light shielding film, a transparent electrode, and an alignment film are formed, and in which a pixel region surrounded by a color filter is formed inside the screen of the predetermined shape, except for the pixel region. A light shielding film is formed on the surface area of the substrate.

[Effect]

According to the color liquid crystal display element having the above configuration, light does not leak from the peripheral part of the pixel area, and the display area is significantly reduced. <Improve.

〔Example〕

The present invention will be explained in detail below using a chromatic dispersion compensated color liquid crystal display element as an example.

FIGS. 1 and 2 show an embodiment of the color liquid crystal display element of the present invention, and are a schematic cross-sectional view and a schematic plan view, respectively.

Note that the same parts as those of the color liquid crystal display elements in FIGS. 5 and 6 are given the same reference numerals.

This example has a structure in which a display liquid crystal cell A and a chromatic dispersion compensation liquid crystal cell B are stacked, and the formation area of the light shielding film is larger than that of the preceding color liquid crystal display elements shown in FIGS. 5 and 6. It is characterized by the fact that it expands.

The display liquid crystal cell A includes a liquid crystal layer 3, two transparent substrates 1.2 made of glass, translucent resin, etc. that sandwich the core layer 3,
It consists of a sealant 4 (for example, an epoxy resin mixed with glass fiber is used) that has the role of a spacer. Then, on the inner surface of the transparent substrate 2, a fine color filter 5 colored in one of the primary colors of red (R), green (G), and blue (B) by a gelatin dyeing method is coated with a film thickness of 2.0 to 2. ．．
Each filter 5 is formed in a stripe shape with a thickness of 5 μm, and each filter 5 is formed as an individual pixel. The area surrounded by the filters arranged at the periphery of the color filter 5 becomes a pixel area.

A light shielding layer 9 is formed between the individual color filters 5, and this film 19 is also formed around the pixel area M, so that the light shielding film 1 is formed over the entire screen area.
9 is formed. This film 19 is made of a metal thin film such as chromium or an organic resin dyed with a black dye.
After evaporating the entire surface by 2,000 people, it is patterned into a predetermined shape using photolithography. - If the above film thickness is used for boat fishing, the light transmittance will be 12 or less, providing a sufficiently large light shielding effect.

Next, a flattening film 7 is formed on the color filter 5 in order to reduce the unevenness of the filter and flatten the plate surface. This film 7 is formed by applying, for example, acrylic resin by a printing method or the like.

A transparent electrode 8 is formed on the flattening film 7 to apply an electric field to the liquid crystal N3. This electrode 8 is made of indium oxide doped with tin oxide, and is patterned into a predetermined shape with a film thickness of 500 to 2000 mm using photolithography.

Furthermore, an alignment film 9 is formed on the transparent electrode 8 to determine the arrangement of liquid crystal molecules. This film 9 is, for example, manufactured by Yasan Kagaku Co., Ltd.
It is made of E-4110J polyimide resin, and is formed by applying this resin to a thickness of 80 to 1000 coats and rubbing in a predetermined direction.

The transparent electrode 10 and alignment film 11 are sequentially laminated on the inner surface of the transparent substrate 1 in the same manner as described above.

Liquid crystal N used in display liquid crystal cell 8 with such a configuration
In No. 3, a dextrorotatory optically active substance is added to the nematic liquid crystal having a positive dielectric constant anisotropy in order to define the twist direction. For example, 1.5% by weight of CB-15 manufactured by BDH is added. Further, the optical path difference Δnd of this liquid crystal layer 3 is set to 0.85.

The liquid crystal cell B for chromatic dispersion compensation is the same as the previous color liquid crystal display element shown in FIG.

Regarding the positional relationship between the liquid crystal cell A for display and the liquid crystal cell B for chromatic dispersion compensation, the long axis direction of liquid crystal molecules arranged on the inner surface of the substrate 2 of the liquid crystal cell A and the substrate 12 of the liquid crystal cell B for chromatic dispersion compensation are determined. Both liquid crystal cells ^, B are stacked so that the long axes of the liquid crystal molecules arranged on the inner surface of the cell are perpendicular to each other.

In addition, the polarized light Fi, 17 is a polarization axis that forms a predetermined angle (for example, -45 to +45'') with the long axis direction of liquid crystal molecules arranged on the inner surface of the substrate 2 to the display liquid crystal cell. The other polarizing plate 18 has a polarization axis that makes a predetermined angle (for example, -45 to +45°) with respect to the long axis direction of the liquid crystal molecules arranged on the inner surface of the substrate 12 of the liquid crystal cell B for chromatic dispersion compensation. has.

In this way, when the chromatic dispersion-compensated color liquid crystal display element with the above configuration was turned on and visually observed, it was found that light leakage from the periphery of the pixel area was completely prevented, and as a result, the contrast was improved and the screen became very easy to view. It was confirmed that the display quality was significantly improved.

FIGS. 3 and 4 show color liquid crystal display elements of other embodiments, and are a schematic cross-sectional view and a schematic plan view, respectively. still,
The same parts as those of the color liquid crystal display elements in FIGS. 1 and 2 and FIGS. 5 and 6 are given the same reference numerals.

In this example, chromatic dispersion compensation using an optically anisotropic body is performed using a uniaxially stretched polymer film instead of liquid crystal cell B.

This chromatic dispersion compensating polymer film 2o is made of polycarbonate, polyvinyl alcohol, etc.
Can be pasted on top of 2. When pasting this film 2o, the angle between the long axis direction of the liquid crystal molecules arranged on the inner surface of the transparent substrate 12 and the stretching axis direction of the film 2o is set to 10.
The temperature is set within the range of ~20°C, and the optical path difference nd of this polymer film 20 is set to 0.60. Furthermore, the optical path difference between the display liquid crystal panel and the eye
Set -d to 0.85.

Further, polarizing plates 21 and 22 are pasted on the transparent substrate 2 and the polymeric film 20, respectively, and the polarizing plates 21 are aligned in the longitudinal direction of the liquid crystal molecules arranged on the inner surface of the substrate 2 of the display liquid crystal cell A. The other polarizing plate 22 has a polarizing axis forming a predetermined angle (for example, 40 to 50''), and the other polarizing plate 22 is a polymer film 2.
It has a polarization axis that makes a predetermined angle (for example, 40 to 5 degrees) with the direction of the stretching axis of zero.

When the color liquid crystal display element was turned on and visually observed, it was confirmed that the screen had a high contrast and was very easy to see, and the display quality was significantly improved.

〔Effect of the invention〕

As is clear from the above embodiments, according to the color liquid crystal display element of the present invention, a light shielding film is formed on the surface area of the transparent substrate other than the pixel area, for example, up to the periphery of the screen, so that light from the periphery is Leakage could be prevented and high display quality could be obtained.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be applied to other types of color liquid crystal display elements, such as reflective liquid crystal display elements, without departing from the gist of the present invention.

[Brief explanation of drawings]

1 and 2 are a schematic cross-sectional view and a schematic plan view, respectively, of a chromatic dispersion-compensated color liquid crystal display element according to the present invention, and FIGS. 3 and 4 respectively show other embodiments of the present invention. 1 is a schematic cross-sectional view and a schematic plan view of a chromatic dispersion-compensated color liquid crystal display element. 5 and 6 are a schematic cross-sectional view and a schematic plan view, respectively, of a conventional chromatic dispersion-compensated color liquid crystal display element. A... Liquid crystal cell for display B... Liquid crystal cell for chromatic dispersion compensation 1, 2.12.13... Transparent substrate 3.15... Liquid crystal layer 5... Color filter 6.19... Light shielding film 20 ... Polymer film patent applicant (633) Kyocera Corporation representative Kinju Anjo

Claims (3)

[Claims] (1) A liquid crystal is sandwiched between two transparent substrates to form a screen with a predetermined shape, and on the inner surface of the substrates there are many color filters that become pixels, a light shielding film interposed between the filters, transparent electrodes, and alignment. In a color liquid crystal display element comprising a display liquid crystal cell on which a film is formed, and in which a pixel region surrounded by the color filter is formed inside the screen having a predetermined shape, a light shielding film is provided on a substrate surface region other than the pixel region. A color liquid crystal display element characterized by: (2) The color liquid crystal display element according to claim 1, wherein a light shielding film is formed in a substrate surface area around the pixel area. (3) The color liquid crystal display element according to claim (1), further comprising a chromatic dispersion compensating member made of an optically anisotropic material formed on the display liquid crystal cell.