JPH073522B2 - Liquid crystal display - Google Patents

Description

TECHNICAL FIELD The present invention relates to an active matrix type liquid crystal display device for image display.

<Prior Art> An active matrix liquid crystal display device has 200 scanning lines.
It is a display device that has advanced rapidly over the last 10 years as a high-performance liquid crystal display device that has a contrast ratio of 15: 1 or more even if it exceeds the number of books and is capable of full-color display. However, fabrication of thin film transistors (TFTs) and non-linear elements (diode rings, MIM diodes, etc.) used as active matrix elements involves many film forming, masking and etching processes. Therefore, as it is, it is practically difficult to produce a defect-free liquid crystal display element and commercialize it. Therefore, manufacturers are moving toward reducing defects such as reducing the number of redundant circuits and masks. However, complete defect-free is considered impossible.

Therefore, if it is difficult for human eyes to recognize it as a defect even if it has a certain amount of defect, it is considered possible to commercialize it for image display.

FIG. 2 is an explanatory diagram of a conventional liquid crystal display device. A liquid crystal display panel has a polarizing plate on the outer surface of a rear glass substrate, an active matrix layer consisting of a TFT and a transparent electrode on the inner surface, an alignment film of liquid crystal on it, an alignment film sandwiching the liquid crystal layer, and a transparent electrode below it. A color filter, a front glass substrate as a base material, and a polarizing plate on the outer surface thereof. Furthermore, the irradiation light from the back surface of the panel illumination is shown.

<Problems to be Solved by the Invention> In such a display device, if a pixel having an active matrix has a defect, only that pixel is constantly lit or non-lit, and is conspicuous as a point defect.

As the screen size increases and the number of display pixels increases, the number of defects generated in the active matrix increases accordingly. As a result, the yield of non-defective active matrix liquid crystal display devices is extremely poor.

It is an object of the present invention to provide a liquid crystal panel that can be made into a product by making it inconspicuous even if it has a certain degree of defects, which has not been a product as a product unless the defects were almost zero.

<Specific Means for Solving the Problem> A liquid crystal display device of the present invention is provided with a light diffusion layer on the inner surface of a front glass substrate of a liquid crystal panel, and a microlens having a 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 the respective lenses.

<Effects> According to the present invention, even if there is a point defect in the active matrix, the display of the point defect pixel can be interpolated by the light from the surrounding pixels due to the presence of the light diffusion layer, so that the display surface is always lit or Defects that are noticeable to humans, such as lights off, do not appear.

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 location 0.5 to 10 mm away from the light diffusion layer for the thickness of the glass, the brightness and contrast are improved. Can be supplemented.

<Example> An example of the present invention will be described with reference to FIG.

In the figure, the liquid crystal is sandwiched between a rear glass substrate and a front glass substrate. On the outer surface of the rear glass substrate, a polarizing plate for polarizing the irradiation light from the rear surface is attached. On the other hand, the inner surface has an active matrix layer consisting of a TFT or MIN diode and its wiring and a transparent pixel electrode (ITO or SnO ₂ ), on which an alignment film (eg polyimide, SiO ₂ oblique vapor deposition, etc.) is formed. is there.
In addition, a light diffusion layer (for example, 1 to
A thin glass plate of 2 mm is ground or etched into frosted glass, or glass beads are laid and fixed) to be glued.

Further, a color filter and a transparent electrode (ITO, SnO ₂ ) are formed on the light diffusion layer, and an alignment film is formed thereon. On the other hand, a polarizing plate is attached to the outer surface of the front glass substrate, and a microlens or a lenticular lens (for example, a glass plate formed into a lens shape by etching or the like, or a plastic injection-molded into a lens shape is formed on the polarizing plate. Object) is formed, and a mesh-shaped black stripe (metal such as chrome or black ink or black resin) having a pixel size is further formed between each lens.

As shown in the enlarged explanatory view of FIG. 3, even if there is a defective portion in the active matrix layer, the action of the light diffusing layer and the microlens corresponding to the defective portion causes the defective pixel based on the surrounding pixel information. Produces information about the club and does not turn on or turn off the light. Further, since there is a black matrix, the contrast is not impaired.

<Effects of the Invention> According to the present invention, the defective pixel information can be interpolated based on the surrounding pixel information by the light diffusion layer and the microlens or the lenticular lens to make it difficult to recognize the display of the defective pixel as a defect. it can. Also, a micro lens,
Alternatively, the Renchu Killer lens and the black matrix compensate for the brightness and sharpness (contrast ratio) of the image quality deteriorated in the light diffusion layer, and even if there are some point defects,
The present invention provides a liquid crystal display device having a structure that can be used as a product.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a liquid crystal display device of the present invention, and FIG. 2 is an explanatory view 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: Active matrix layer: Alignment film: Liquid crystal: Color filter: Light diffusion layer: Front glass substrate: Microlens: Black stripe: Back irradiation light: Defective area

Claims (1)

[Claims] 1. A liquid crystal display device in which liquid crystal is sealed between two transparent glass substrates facing each other, and a light diffusing layer is provided on the inner surface of the front glass substrate, and the pixel is formed on the outer surface of the glass substrates. A liquid crystal display device characterized in that a microlens or a lenticular lens having a large size and a black matrix are installed between the respective lenses.