|Publication number||US20050046775 A1|
|Application number||US 10/883,422|
|Publication date||Mar 3, 2005|
|Filing date||Jun 30, 2004|
|Priority date||Aug 26, 2003|
|Also published as||CN1591142A, CN100359396C, US7535534, US20070296902|
|Publication number||10883422, 883422, US 2005/0046775 A1, US 2005/046775 A1, US 20050046775 A1, US 20050046775A1, US 2005046775 A1, US 2005046775A1, US-A1-20050046775, US-A1-2005046775, US2005/0046775A1, US2005/046775A1, US20050046775 A1, US20050046775A1, US2005046775 A1, US2005046775A1|
|Inventors||Kyung Ha Lee, Hyang Yul Kim, Jong Yob Jeon, Chi Wook An|
|Original Assignee||Kyung Ha Lee, Hyang Yul Kim, Jong Yob Jeon, Chi Wook An|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (12), Classifications (8), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the invention
The present invention relates to a fringe field switching (hereinafter, simply referred to as “FFS”) mode liquid crystal display, and more particularly to an FFS mode liquid crystal display capable of improving driving mura and luminance non-uniformity.
2. Description of the Prior Art
A method for fabricating an ultra-FFS mode liquid crystal display may be described as follows, with reference to
As shown in
Also, as shown in
Owing to such a construction, when liquid crystal molecules are twisted by an electric field, upper liquid crystal molecules (a color filter substrate) and lower liquid crystal molecules (an array substrate) are twisted in opposite directions from each other, thereby compensating for chromatic shift toward a bluish color or a yellowish color, which is caused by dielectric anisotropy of the liquid crystal.
According to the conventional FFS mode liquid crystal display fabricated the above-mentioned method, since an overlapped region between electrodes is very wide, layers such as an insulation layer may be deteriorated due to long-period electrical operations, which results in inferior afterimages.
In order to correct such a disadvantage, various shapes and structures of electrodes have been studied and proposed.
However, according to conventional FFS pixels, a pixel wedge for the FFS pixels is not located in the black matrix but located in the real transmission region.
As a result, such a relationship between the pixel wedge and the black matrix causes transmittance reduction and luminance non-uniformity due to an alternation operation between them, so that the characteristics of manufactured goods are deteriorated.
Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide an FFS (Fringe Field Switching) mode liquid crystal display which can improve operating mura, luminance non-uniformity, etc., which have been problematic in the conventional FFS mode liquid crystal display, by establishing a new conception of mutual factors between a black matrix and a pixel electrode provided in an FFS design structure.
In order to accomplish this object, there is provided an FFS (Fringe Field Switching) mode liquid crystal display comprising: a lower substrate and an upper substrate; a gate line formed on the lower substrate; a data line crossing perpendicular to the gate line; a first ITO electrode formed in a region defined by the gate line and the data line; a second ITO electrode of a comb-teeth pattern formed on the lower substrate while being overlapped on the first ITO electrode; and a black matrix formed on the upper substrate, wherein, a wedge portion of the second ITO electrode is formed at a position spaced by a predetermined interval to the inside from an edge section of the black matrix.
The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description and drawings, the same reference numerals are used to designate the same or similar components, and so repetition of the description on the same or similar components will be omitted.
As shown in
In addition, as shown in
Meanwhile, according to other embodiments of the present invention, as shown in
As described above, according to the FFS mode liquid crystal display of the present invention, the location and the shape of the wedge portion is changed, so as to improve distortion of the liquid crystal which is caused by an electric field interference between the black matrix and the wedge portion. That is, the wedge portion of the second ITO electrode having a comb-teeth pattern is located within a region of the conductive black matrix, thereby improving the polarization efficiency of the liquid crystal, mura, luminance non-uniformity and afterimages (that is, unstableness of the liquid crystal according to an unstable operation) generated in a gray region of the wedge portion.
Although a preferred embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
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|International Classification||G02F1/13357, G02F1/1335, G02F1/1368, G02F1/1343|
|Cooperative Classification||G02F1/134363, G02F1/133512|
|Jun 30, 2004||AS||Assignment|
Owner name: BOE HYDIS TECHNOLOGY CO., LTD., KOREA, REPUBLIC OF
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LEE, KYUNG HA;KIM, HYANG YUL;JEON, JONG YOB;AND OTHERS;REEL/FRAME:015547/0815
Effective date: 20040601