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PSA LCD panel

Inactive Publication Date: 2008-02-14
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]The object the present invention is to provide a PSA (polymer stabilized alignment) technology for constructing an LCD panel. By designing the pixel electrode, the transistor, the crystal capacitor and the storage capacitor within each pixel unit of the LCD panel, the pattern of the pixel unit can be divided into eight domains instead of four domains. Once, the pattern is thus arranged, the wide viewing and color washout phenomenon is greatly improved.

Problems solved by technology

The production method is relatively complicated and results in the higher manufacturing cost.
Moreover, since the protrusions formed on the substrate may hinder passage of light therethrough and the increased quantity thereof consequently reduces the number of the slits, which, in turn, lowers the brightness in the display panel of the LCD device.
However, it is in the trend to produce the LCD panel in a larger dimension, the aforesaid design is unable to solve the color-shift in the changing view angle and reduce the color washout phenomenon.

Method used

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Experimental program
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Effect test

first embodiment

[0052]The pixel unit 40 generally has the structure similar to the first embodiment, and has first and second pixel electrodes 411, 421 separated from each other. Referring to FIG. 5, each of the first and second pixel electrodes 411, 421 has a pattern scattered from a center in such a manner to form four domains. Each of the four domains of a respective one of the first and second pixel electrodes 411, 421 includes a plurality of parallel ribs extending in the predetermined inclined direction.

[0053]In the above embodiment, the first crystal capacitor Clc1 is formed by the first pixel electrode 411, the crystal layer 440 and the first common electrode 412, wherein the first common electrode 412 is formed on the upper substrate 400. The first storage capacitor Cst1 is formed by a first capacitor electrode 413, the first dielectric layer 460 and the second common electrode 414. The first storage capacitor Cst1 is coupled to the first crystal capacitor Clc1 in parallel while the second...

second embodiment

[0057]In the second embodiment, since the first and second storage capacitors Cst1 and Cst2 have different voltage levels, when the pixel unit 40 is under the operation, the first pixel electrode 411 and the second pixel electrode 421 may receive the voltage levels different from each other so as to result in two electric fields with differing strength. Thus, the orientation of the crystal molecules at the different domains differs from each other under the influence of the different electric fields.

[0058]Each of the first and second pixel electrodes 411, 421 has a pattern scattered from a center in such a manner to form four domains. The increased domains of the pattern in each of the first and second pixel electrodes 411, 421 from four to eight domains magnificently lower the color-shift in the changing view angle and the washout phenomenon, which, in turn, provides a better display ability.

[0059]In addition, by applying two different voltage levels Vcom2, Vcom3 respectively on th...

third embodiment

[0068]Therefore, in the third embodiment, the pixel unit 50 includes two subpixels SP, each of the subpixels is formed by a transistor, a crystal capacitor and a storage capacitor separated from one another.

[0069]It is noted that the pixel unit 50 of the PSA LCD panel has first and second pixel electrodes 511, 521 separated from each other. Referring to FIG. 7, each of the first and second pixel electrodes 511, 521 has a pattern scattered from a center in such a manner to form four domains. Each of the four domains of a respective one of the first and second pixel electrodes 511, 521 includes a plurality of parallel ribs extending in the predetermined inclined direction.

[0070]In each pixel unit, the first and second transistors 510, 520 are adapted to be switched on in response to the scan signal so as to permit the voltage signal to be transmitted from the data line 502 to the first and second pixel electrodes 511, 521, thereby driving the respective display domains. At this time, ...

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Abstract

A PSA LCD panel includes a plurality of pixel units. Each of the pixel units includes a first pixel electrode and a second pixel electrode separated from the first pixel electrode. Each of the first and second pixel electrodes has a pattern scattered from a center in such a manner to form four domains.

Description

BACKGROUND OF THE INVENTION[0001](1) Field of the Invention[0002]The present invention relates to an LCD panel, and more specifically to a PSA (polymer stabilized alignment) LCD panel.[0003](2) Description of the Prior Art[0004]Due to rapid development in the display technology, an LCD (liquid crystal display) device is generally preferred to when compared to the conventional CRT-type display device due to its compact size and quick response time in addition to its lower power consumption and low radiation. Therefore, the LCD device is in great demand in the market and is widely used in many electronic devices, such as calculators, PDAs, notebook computers, digital cameras and mobile phones.[0005]Due to market competition, the LCD manufacturers have devoted a tremendous effort in the research to improve the ability of the LCD device and simultaneously lower the cost. Therefore, the demand for the LCD device is increasing. Presently, the research is emphasized in the field how to wid...

Claims

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Application Information

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IPC IPC(8): G02F1/1343
CPCG02F1/133707G02F2001/13775G02F1/134336G02F1/13775
Inventor CHAN, TE-WEICHEN, YA-CHIEHCHIU, CHUNG-YISU, TING-WEIHUANG, YI-PAICHANG, TING-JUISU, JENN-JIA
Owner AU OPTRONICS CORP