Bibliographic Details
| Title: |
Multi-domain liquid crystal display |
| Document Number: |
20080106658 |
| Publication Date: |
May 8, 2008 |
| Appl. No: |
11/979040 |
| Application Filed: |
October 30, 2007 |
| Abstract: |
A multi-domain liquid crystal display includes a plurality of picture elements arranged in an array of rows and columns and controlled by a line inversion drive scheme. Each picture element has a pixel electrode and at least one control electrode insulated from each other. All the control electrodes in the same row or the same column of picture elements are connected to the same signal source to provide a voltage difference between the control electrodes and the pixel electrodes in the same row or the same column of picture elements to produce fringe fields. |
| Inventors: |
Wang, Wen-Chun (Tai Chung City, TW); Tsai, Wan-Jen (Lung Ching Hsiang, TW); Yu, Min-Chang (Tai Chung City, TW); Lee, Chian-Chang (Tai Chung City, TW) |
| Claim: |
1. A multi-domain liquid crystal display, comprising: a plurality of picture elements arranged in an array of rows and columns and controlled by a line inversion drive scheme, each of which has a pixel electrode and at least one control electrode insulated from each other, wherein all the control electrodes in the same row or the same column of picture elements are connected to the same signal source to provide a voltage difference between the control electrodes and the pixel electrodes in the same row or the same column of picture elements to produce fringe fields. |
| Claim: |
2. The multi-domain liquid crystal display as claimed in claim 1, wherein the signal source supplies a voltage signal to the control electrodes in the same row or the same column of picture elements, and the polarity of the voltage signal varies according to the polarity of the pixel electrodes in the same row or the same column of picture elements. |
| Claim: |
3. The multi-domain liquid crystal display as claimed in claim 1, wherein each picture element comprises a common electrode, the voltage on the control electrodes is set as larger than the voltage on the pixel electrodes in the same row or the same column of picture elements when the voltage on the pixel electrodes is larger than the voltage on the common electrode, and the voltage on the control electrodes is set as smaller than the voltage on the pixel electrodes in the same row or the same column of picture elements when the voltage on the pixel electrode is smaller than the voltage on the common electrode. |
| Claim: |
4. The multi-domain liquid crystal display as claimed in claim 1, wherein the signal source is a gate driver IC. |
| Claim: |
5. The multi-domain liquid crystal display as claimed in claim 1, further comprising a plurality of switching devices each connected between the control electrode and the signal source. |
| Claim: |
6. The multi-domain liquid crystal display as claimed in claim 1, wherein the signal source is an independent voltage source irrelevant to the drive scheme of a thin film transistor. |
| Claim: |
7. The multi-domain liquid crystal display as claimed in claim 1, wherein the signal source is provided in the non-active display area of the multi-domain liquid crystal display. |
| Claim: |
8. The multi-domain liquid crystal display as claimed in claim 1, wherein each control electrode includes a field-induced part and a connection part, and each pixel electrode is provided with at least one opening at a position overlapping the field-induced part. |
| Claim: |
9. The multi-domain liquid crystal display as claimed in claim 8, wherein the field-induced part of the control electrode and the opening have a circular shape or a polygonal shape, and the area of the field-induced part is larger than that of the opening. |
| Claim: |
10. The multi-domain liquid crystal display as claimed in claim 1, wherein each picture element is provided with at least one slit that divides each picture element into a plurality of sub picture elements. |
| Claim: |
11. The multi-domain liquid crystal display as claimed in claim 1, wherein each picture element further comprises an auxiliary electrode that at least partially surrounds the pixel electrode and is connected to a signal source that is different to the signal source to which the control electrode is connected. |
| Claim: |
12. A multi-domain liquid crystal display, comprising: a first and a second substrates facing to each other; a liquid crystal layer interposed between the first and the second substrates; a common electrode provided on one side of the first substrate facing the second substrate; a plurality of control electrodes formed on one side of the second substrate facing the first substrate; a dielectric layer formed on the second substrate and covering the control electrodes; and a plurality of pixel electrodes arranged in a form of an array of rows and columns on the dielectric layer, wherein two immediately adjacent rows of pixel electrodes have polarities opposite to each other, or two immediately adjacent columns of pixel electrodes have polarities opposite to each other under the same frame of an inversion drive scheme; wherein all the control electrodes positioned overlapping the same row or the same column of pixel electrodes are connected to the same signal source that supplies a voltage signal whose polarity varies according to the polarity of the pixel electrodes in the same row or the same column. |
| Claim: |
13. The multi-domain liquid crystal display as claimed in claim 12, wherein the voltage on the control electrodes is set as larger than the voltage on the pixel electrodes in the same row or the same column when the voltage on the pixel electrodes is larger than the voltage on the common electrode, and the voltage on the control electrodes is set as smaller than the voltage on the pixel electrodes in the same row or the same column when the voltage on the pixel electrode is smaller than the voltage on the common electrode. |
| Claim: |
14. The multi-domain liquid crystal display as claimed in claim 12, wherein the signal source is a gate driver IC. |
| Claim: |
15. The multi-domain liquid crystal display as claimed in claim 12, further comprising a plurality of switching devices each connected between the control electrode and the signal source. |
| Claim: |
16. The multi-domain liquid crystal display as claimed in claim 12, wherein the signal source is an independent voltage source irrelevant to the drive scheme of a thin film transistor. |
| Claim: |
17. The multi-domain liquid crystal display as claimed in claim 12, wherein the signal source is provided in the non-active display area of the multi-domain liquid crystal display. |
| Claim: |
18. The multi-domain liquid crystal display as claimed in claim 12, wherein the control electrodes are formed from a Metal 1 layer or a Metal 2 layer. |
| Claim: |
19. The multi-domain liquid crystal display as claimed in claim 12, further comprising a plurality of auxiliary electrodes connected a signal source to which the common electrode is connected, and each auxiliary electrode at least partially surrounding the pixel electrode. |
| Claim: |
20. The multi-domain liquid crystal display as claimed in claim 12, wherein each pixel electrode is provided with at least one slit that divides each pixel electrode into a plurality of sections. |
| Current U.S. Class: |
349/37 |
| Current International Class: |
02 |
| Accession Number: |
edspap.20080106658 |
| Database: |
USPTO Patent Applications |
