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Multi-domain vertical alignment liquid crystal display

a liquid crystal display and multi-domain technology, applied in the field of multi-domain vertical alignment lcd (mva lcd), can solve the problems of increasing manufacturing cost and complexity

Inactive Publication Date: 2006-03-16
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a multi-domain vertical alignment liquid crystal display (MVA LCD) that achieves a wide viewing angle and simplifies the manufacturing process. The invention achieves a multi-domain effect by simply forming slits in the pixel electrode of one substrate. High, medium, and low voltages are created, and inclined electric fields are produced. The liquid crystal molecules are aligned at different tilt angles, and several domains are formed. The invention simplifies the manufacturing process by using a single substrate for the main slit and the common electrode, and eliminating the need for additional processing steps. The technical effects of the invention are a wider viewing angle and improved image quality.

Problems solved by technology

They also need additional processing steps for the upper and lower substrates, which increases the cost and complexity of manufacturing.

Method used

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  • Multi-domain vertical alignment liquid crystal display

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Experimental program
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first embodiment

[0014] Referring to both FIG. 2 and FIG. 3, FIG. 2 shows a top view of one pixel unit for the multi-domain vertical alignment liquid crystal display (MVA LCD) according to the present invention. FIG. 3 shows the cross section of FIG. 2 along the M line as indicated in FIG. 2. In FIG. 3, the MVA LCD includes a substrate 11a, a substrate 11b, a common electrode 12b, a pixel electrode 25, a vertical alignment film 14a, a vertical alignment film 14b, and a liquid crystal material between the substrate 11a and 11b. The liquid crystal material is a negative type, such that the liquid crystal molecules are inclined to be substantially perpendicular, i.e, at the angle of about 85-90 degree, to the direction of the electric field. In FIG. 2, one pixel of the MVA LCD at least includes a data line 21, a gate line 22, a source 23, a drain 24, and a pixel electrode 25. The pixel electrode 25 has a main slit 26 of longshape, two main electrodes 28 of long shape, and four grating electrodes. The m...

second embodiment

[0016]FIG. 4 shows a top view of one pixel unit for the MVA LCD according to the present invention. One pixel of the MVA LCD at least includes a data line 21, a gate line 22, a source 23, a drain 24, and a pixel electrode 45. The pixel electrode 45 has two main slits 46 of long shape, four main electrodes 48 of long shape, and four grating electrodes. The pixel electrode 45 is divided into four domains by the main slit 46. The grating electrodes are on the two sides of the main electrode 48. The grating electrode consists of a plurality of slender sub-slits 47 and a plurality of slender sub-electrodes 49. The sub-slits 47 alternate with the sub-electrodes 49.

[0017] When a voltage is applied across the pixel electrode 45 and the common electrode, the main electrode 48 and the common electrode have a higher absolute voltage difference than the grating electrode and the common electrode. The main slit 46 and the common electrode have the lowest absolute voltage difference. The electric...

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Abstract

A multi-domain vertical alignment liquid crystal display (MVA LCD) has a plurality of pixel electrodes for defining a plurality of pixel units. The pixel units are disposed in matrix arrangement, and each of them has a first electrode, a second electrode, and a third electrode. When a voltage is applied to said pixel electrode, the first electrode and the common electrode have a higher absolute voltage difference than the second electrode and the common electrode. The third electrode and the common electrode have the lowest absolute voltage difference.

Description

[0001] This application claims the benefit of Taiwan application Serial No. 092113143, filed May 14, 2003. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates in general to a liquid crystal display (LCD), and in particular, to a multi-domain vertical alignment LCD (MVA LCD). [0004] 2. Description of the Related Art [0005] The multi-domain vertical alignment liquid crystal display (MVA LCD) has a wide viewing angle, compared to the traditional LCD. FIG. 1 is a cross section of the traditional MVA LCD when no voltage is applied. An electrode 12a is formed on a substrate 11a. A bump 13a, composed of insulating material, is formed on the electrode 12a. The bump 13a and the electrode 12a are covered by a vertical alignment film 14a. Furthermore, an electrode 12b is formed below a substrate 11b. Also, a bump 13b of the insulating material is formed below the electrode 12b. The bump 13b and the electrode 12b are covered by a vertical alignment film 14b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L29/04G02F1/139G02F1/1333G02F1/1337G02F1/1343G02F1/1368
CPCG02F1/134336G02F1/133707
Inventor WU, YANG-ENTAI, SHIH-PENGWU, MING-CHOU
Owner AU OPTRONICS CORP