US 6,549,257 B2Granted

Structure of a multi-domain wide viewing angle liquid crystal display

AssigneeIndustrial Technology Research Institute

InventorHong-Da Liu

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Abstract

A multi-domain wide viewing angle liquid crystal display (LCD) has a plurality of superimposed spacing wall-bump structures formed on a pair of parallel substrates. Each superimposed spacing wall-bump (SSWB) structure includes a surrounding wall-bump structure formed around a pixel area on a first substrate and a central wall-bump structure formed in a central portion of the pixel area on a second substrate. Wall-bumps of many different shapes can be used for the central wall-bump structure. The superimposed spacing wall-bump structure provides pre-tilted angles for liquid crystal molecules and results in orderly alignment of liquid crystal molecules when an external voltage is applied. By means of the fringe field effect to tilt liquid crystal molecules, a multi-domain LCD cell can be established after a voltage is applied. The manufacturing method for the SSWB needs neither rubbing process nor polymer stabilized ultraviolet curing process. The multi-domain wide viewing angle LCD provides fast response speed for its application and higher transmittance than conventional multi-domain wide-viewing angle LCDs.

Claims4

Dependent claims

A method for fabricating a superimposed spacing wall-bump structure disposed on two substrates of a multi-domain wide viewing angle liquid crystal display, comprising the steps of:

(a) preparing first and second substrates, said first substrate having a pixel electrode layer formed thereon and said second substrate having a common electrode layer formed thereon;
(b) manufacturing a first plurality of surrounding wall-bump structures on said pixel electrode layer and a second plurality of central wall-bump structures on said common electrode layer, each of said surrounding wall-bump structures being formed around a pixel area on said pixel electrode layer and a corresponding central wall-bump being formed in a central portion of said pixel area;
(c) applying a layer of alignment film on said first plurality of surrounding wall-bump structures and on said second plurality of central wall-bump structures respectively;
(d) dispensing conductive epoxy to establish electrical conduction for said first and second substrates;
and
(e) aligning and pressing said first and second substrates together;
wherein each surrounding wall-bump structure superimposes the corresponding central wall-bump structure to form a cell gap.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/880,228Filed 12 Jun 2001 · division
Priority: 22 May 2000
Published: US 2001/0043301 A122 Nov 2001
Granted: 15 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G02F 1/133707
Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers: structures for producing distorted electric fields, e.g.…
G02F 1/1393
Based on orientation effects in which the liquid crystal remains transparent: the birefringence of the liquid crystal being electrically…
G02F 1/13373
Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers: disclination line; Reverse tilt
G02F 1/133765
Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers: without a surface treatment