Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2000-03-23
2001-08-07
Sikes, William L. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S124000, C430S005000
Reexamination Certificate
active
06271904
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method of making liquid crystal display (LCD), and more specifically, to a method of forming a LCD with a wide viewing angle.
BACKGROUND OF THE INVENTION
Recently, personal data assistant (PDA) and notebook are remarkably progressing. The demanded requirements of the displays for portable use are light weight and low power consumption. Thin film transistor-liquid crystal display (TFT-LCD) can meet the above requirements and is known as the display required for the high pixel density and quality. In general, the TFT-LCD includes a bottom plate formed with thin film transistors and pixel electrodes and a top plate formed with color filters. The liquid crystal is filled between the top plate and the bottom plate. In each unit pixel, a capacitor is provided which is formed by virtue of the TFT serving as the switching element of the unit pixel. When the data voltage is applied to the TFT, the arrangement of the liquid crystal molecules is change, thereby changing the optical properties and displaying the image.
In general, the viewing angle and the color performance are very important issues for the design of the LCD. A color filter (CF) plate is used in the LCD to show the colored portion of the screen. One of the trends for the LCD technology is to improve the viewing angle of the LCD. However, the viewing angle and contrast ratio of LCD are still insufficiently applied to products having large screen. One of an article relating to a vertical-alignment-mode LCD can be seen in SID'
97
DIGEST p845~p848, proposed by K. Ohmuro, S. Kataoka, T. Sasaki and Y. Koike. In the reference, the VA-LCD(vertically aligned LCD) has been implemented by optimizing a vertically aligned mode with a domain-divided structure and an optical compensator. This vertical-alignment-mode LCD has a wide viewing angle over 70°, a fast response (<25 ms), and a high contrast ratio of over 300. However, it still suffers some drawbacks. For example, the formation of the two-domain structure needs the mask rubbing process, which is complicated and expensive. The rubbing process also produces ESD (Electrostatic Discharge) problem and particles. In addition, the mask rubbing will lead to a result of image sticking.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a LCD with wide viewing angle.
Another object of the present invention is to provide bump structures in a LCD, thereby providing the pre-titled angle of the liquid crystal molecules.
The present invention includes a pair of light polarizers consisting of a polarizer and an analyzer. A pair of transparent substrate are formed between the pair of light polarizers. A compensator is formed on the analyzer. Bump structures are formed above the substrate. The liquid crystal molecules have larger pre-titled angle that are formed on the bump structure having predetermined lending directions. The bump structures are formed on at least one of the pair of substrate to provide pre-titled angle for liquid crystal molecules filled between the pair of glass substrate, wherein the bump structure includes inclined surfaces. The heights of the two ends of the bump structure are different. Orientation layers are formed over the pair of glass substrate and over the bump structures.
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patent: 5786878 (1998-07-01), Kim
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“Ridge and Fringe-Fidel Multi-Domain Homeotropic LCD”, by Lien et al., SID SYM, vol. 29, pp. 1123, 1998.
“A Super-High-Image-Quality Multi-Domain Vertical Alignment LCD by New Rubbing-Less Technology”, by Takeda et al., SID SYM, vol. 29, pp. 1077, 1998.
Duong Tai V.
Industrial Technology Research Institute
McDermott & Will & Emery
Sikes William L.
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