JPH01191826A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To make a defect inconspicuous even if the defect exists to some extent by providing a light diffusion layer, a microlens or a lenticular lens of a picture element dimension, and a black matrix, on the inner surface of a front glass substrate, on the outer surface, and between each lens, respectively. CONSTITUTION:A liquid crystal 24 is inserted and held by a back glass substrate 21 and a front glass substrate 28, a polarizing plate 20 is stuck to the outer surface of the substrate 21, and an active matrix layer 22 and an oriented film 23 are provided on the inner surface. Also, a light diffusion layer 27 is stuck to the inner surface of the front glass substrate 28, a color filter and a transparent electrode 26 are formed thereon, and an oriented film 25 is formed thereon. On the other hand, a polarizing plate 29 is stuck to the outer surface of the substrate 28, a microlens or a lenticular lens 30 is formed thereon, and the mesh-like black matrix stripe 31 of a picture element size is formed between the lenses. Even if a defective part exists on the layer 22, information of a defective picture element part is generated, based on picture element information of the periphery by the action of the light diffusion layer 27 and the microlens 31, and conspicuous normally lighting or turn-off does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an active matrix liquid crystal display device for displaying images.

<Prior art> An active matrix liquid crystal display device has 20 scanning lines.
Even if it exceeds 0 lines, the contrast ratio is 15=1 or more,
It is a display device that has rapidly advanced over the past 10 years as a high-performance liquid crystal display device capable of full-color display. However, the creation of thin film transistors (TPT) and nonlinear elements (diode rings, MIM diodes, etc.) used as active matrix elements involves many film formation, masking, and etching processes, and therefore it is impossible to produce a defect-free liquid crystal display as is. It is actually difficult to create and commercialize the device. Therefore, manufacturers are working to reduce defects by using redundant circuits and reducing the number of masks. However, it is considered impossible to completely eliminate defects.

Therefore, it is thought that it is possible to commercialize the product for use in image display as long as even if there is a certain degree of defect, it is easily recognized as a defect by the human eye.

FIG. 2 is an explanatory diagram of a conventional liquid crystal display device.

The liquid crystal display panel has a polarizing plate on the outer surface of the rear glass substrate.
, an active matrix layer ■ consisting of TFT and transparent electrodes on the inner surface, a liquid crystal alignment film ■ on top of it, an alignment film ■ sandwiching the liquid crystal layer ■, and a transparent electrode and a color filter below it ■.
It consists of a front glass substrate (2) as a base material, and a polarizing plate (2) on its outer surface.

Furthermore, the irradiation light [phase] from the back side of the panel illumination is shown.

<Problems to be Solved by the Invention> In such a display device, if a pixel in the active matrix has a defect, only that pixel is constantly lit or not lit, making it noticeable as a point defect.

As the screen size increases and the number of display pixels increases, the number of defects occurring in the active matrix also increases. As a result, the yield of non-defective active matrix liquid crystal display devices has been extremely low.

An object of the present invention is to provide a liquid crystal panel that conventionally could not be commercialized unless it had almost zero defects, but can be commercialized by making the defects less conspicuous even if there are some defects.

Concrete Means for Solving the Problems> The liquid crystal display device of the present invention provides a light diffusion layer on the inner surface of the front glass substrate of the liquid crystal panel, and further includes a microlens with a large pixel size or a lenticular lens on the outer surface of the glass substrate. This is a liquid crystal display device in which a black matrix is installed between each lens.

<Function> According to the present invention, even if there is a point defect in the active matrix, the display of the point defective pixel can be interpolated with light from surrounding pixels due to the presence of the light diffusion layer, so that the display screen is not constantly lit or Defects that are noticeable to the human eye, such as lights being turned off, cannot be displayed.

On the other hand, the presence of this light diffusion layer makes the image unclear, but since a microlens or lenticular lens and a black matrix are provided at a distance of 0.5 to 10 mm, equivalent to the thickness of the glass, from the light diffusion layer, the brightness and It can add contrast.

<Example> An embodiment of the present invention will be described based on FIG.

In the figure, the liquid crystal [phase] is sandwiched between a rear glass substrate 0 and a front glass substrate [phase]. A polarizing plate [phase] for polarizing the irradiated light 0 from the rear surface is pasted on the outer surface of the rear glass substrate (2). On the other hand, its inner surface contains TPT, MIN diodes, their wiring, and transparent pixel electrodes (ITO).
There is an active matrix layer made of (or Snow), and an alignment film (for example, polyimide, SiO□ oblique evaporation, etc.) formed thereon. In addition, a light diffusing layer 0 (for example, 1 to 2 thin glass plates made into a frosted glass shape by polishing or etching) on the inner surface of the front glass substrate [phase],
Attach glass beads (covered with fixed glass beads).

Further, a color filter and a transparent electrode (ITO, Snow) are formed on the light diffusion layer O, and an alignment film [phase] is formed thereon. On the other hand, a polarizing plate 0 is pasted on the outer surface of the front glass substrate [phase], and a microlens or lenticular lens [phase] (for example, a glass plate made into a lens shape by etching, etc., or a plastic injection film) is placed on top of it. A mesh-like black stripe (metal such as chrome, black ink, or black resin) is formed between each lens in a pixel size.

As shown in the enlarged explanatory diagram of FIG. 3, even if there is a defective part 0 in the active matrix layer @, due to the action of the light diffusion layer O and microlens [phase] corresponding to the defective part,
The information [phase] of the defective pixel area is created based on the surrounding pixel information, and the light does not turn on or off noticeably. Furthermore, since there is a black matrix [phase], the contrast is not impaired.

<Effects of the Invention> According to the present invention, defective pixel information can be interpolated based on surrounding pixel information using a light diffusion layer and a microlens or a lenticular lens, thereby making it difficult to recognize the display of a defective pixel as a defect. can.

In addition, microlenses or lenticular lenses and blank matrices compensate for the brightness and sharpness (contrast ratio) of the image quality degraded by the light diffusion layer.
The present invention provides a liquid crystal display device having a structure that can be used as a commercial product even if there are some point defects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of a liquid crystal display device of the present invention, and FIG. 2 is an explanatory diagram showing an embodiment of a conventional liquid crystal display device. FIG. 3 is an explanatory diagram showing the display effect of the liquid crystal display device of the present invention. @@: Polarizing plate ■ = Rear glass substrate @ Near active matrix layer 0 [phase]: Alignment film @: Liquid crystal IS: Color filter O: Light diffusion layer @: Front glass substrate [phase]: Microlens ■ Nibrax drive 0: Light irradiated from the back O: Defect portion Patent application Hitotoppan Printing Co., Ltd. Representative Kazuo Suzuki Figure 1 Figure 2

Claims (1)

[Claims] 1) In a liquid crystal display device in which liquid crystal is sealed in the opposing inner surfaces of two transparent glass substrates, a light diffusion layer is provided on the inner surface of the front glass substrate, and a light diffusion layer with a large pixel size is provided on the outer surface of the glass substrate. A liquid crystal display device characterized in that a microlens or lenticular lens and a black matrix are installed between each lens.