Liquid crystal display

• US 20060231838A1
• Filed: 04/12/2006
• Published: 10/19/2006
• Est. Priority Date: 04/13/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Dong-Gyu
• Granted Patent: US 7,796,104 B2
• Time in Patent Office: Days
• US Class Current: 257/59
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 1/136277 formed on a semiconductor substrate, e.g. of silicon
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/13 combined with thin-film or thick-film passive components

Abstract

A liquid crystal display includes an array of pixels. Each pixel is divided into a first sub-pixel and a second sub-pixel, and different data voltages are separately applied to (or evolved at) the two sub-pixels, thereby enhancing the lateral side visibility. Each sub-pixel includes a sub-pixel electrode (connected to the drain electrode of a sub-pixel'"'"'s switching element) overlapped with the sub-pixel'"'"'s storage electrode. A first predetermined voltage is applied to the first sub-pixel and second predetermined voltage is applied the second sub-pixel, and thus the first sub-pixel electrode may receive a voltage lower than the voltage of the second sub-pixel electrode. The first sub-pixel electrode may be larger in area than the second sub-pixel electrode. The overlapping area between the first drain electrode and the storage electrode of a first sub-pixel may be larger than the overlapping area between the drain electrode and the storage electrode of a second sub-pixel. Thus the kickback voltage of the first sub-pixel may be substantially the same as the kickback voltage of the second sub-pixel.

Claims

1. A liquid crystal display comprising:

a plurality of pixels arranged in the form of a matrix, each pixel having first and second sub-pixels, wherein each subpixel includes;

a sub-pixel electrode;

a storage electrode;

a gate electrode of a switch;

a source electrode of the switch; and

a drain electrode of the switch connected to the sub-pixel electrode,

wherein a first predetermined voltage is applied to the first sub-pixel electrode, a and second predetermined voltage is applied to the second sub-pixel electrode.

2. The liquid crystal display of claim 1, wherein the first predetermined voltage lower than the second predetermined voltage.

3. The liquid crystal display of claim 1, wherein the first and second drain electrodes overlap the first and second storage electrodes, and the overlapping area between the first drain electrode and the first storage electrode is larger than the overlapping area between the second drain electrode and the second storage electrode.

4. The liquid crystal display of claim 1, further comprising first and second gate lines for transmitting gate signals to the first and second gate electrodes, respectively, and a data line for transmitting data voltages to the first and second source electrodes, respectively.

5. The liquid crystal display of claim 4, wherein the timing of the gate signals applied to the first and second gate lines are different from each other.

6. The liquid crystal display of claim 1, further comprising a gate line for transmitting gate signals to the first and second gate electrodes, and first and second data lines for transmitting data voltages to first and second source electrodes.

7. The liquid crystal display of claim 1, further comprising a gate line for transmitting gate signals to the first and second gate electrodes, and a data line for transmitting data voltages to first and second source electrodes.

8. The liquid crystal display of claim 7, wherein the first and second storage electrodes overlap with the first and second drain electrodes, respectively, and are physically and electrically separated from each other.

9. The liquid crystal display of claim 1, wherein the data voltages applied to the first and second sub-pixel electrodes are different in magnitude from each other.

10. The liquid crystal display of claim 1, wherein the first switch is a first thin film transistor and the second switch is a second thin film transistor, and wherein the channel width to channel length ratio of the first thin film transistor is greater than the channel width to channel length ratio of the second thin film transistor.

11. The liquid crystal display of claim 1, wherein the first sub-pixel electrode is larger in area than the second sub-pixel electrode.

12. A liquid crystal display comprising:

a plurality of pixels arranged in the form of a matrix, wherein each pixel has a first sub-pixel and a second sub-pixel;

a first gate line connected to the first sub-pixel; and

a data line perpendicular to the first gate line and connected to the first sub-pixel,

wherein the second sub-pixel is connected to at least one of the first gate line and the first data line.

13. The liquid crystal display of claim 12, wherein the kickback voltage of the first sub-pixel is substantially the same as the kickback voltage of the second sub-pixel;

and

wherein a predetermined voltage is applied to the first sub-pixel, and the first sub-pixel receives a voltage greater than the voltage received by the second sub-pixel.

14. The liquid crystal display of claim 12, further comprising a second gate line connected to the second sub-pixel, wherein the second sub-pixel is connected to the first data line.

15. The liquid crystal display of claim 14, wherein the first sub-pixel comprises:

a first switching element connected to the first gate line and to the first data line;

a first liquid crystal capacitor connected to the first switching element and to a first storage capacitor;

and wherein the second sub-pixel comprises;

a second switching element connected to the second gate line and to the first data line;

a second liquid crystal capacitor connected to the second switching element and having a capacitance smaller than the capacitance of the first liquid crystal capacitor;

and a second storage capacitor connected to the second switching element having a capacitance smaller than the capacitance of the first storage capacitor.

16. The liquid crystal display of claim 12, further comprising a second data line connected to the second sub-pixel, wherein the second sub-pixel is connected to the first gate line.

17. The liquid crystal display of claim 16, wherein the first sub-pixel comprises:

a first switching element connected to the first gate line and to the first data line;

a first liquid crystal capacitor connected to the first switching element; and

a first storage capacitor connected to the first switching element; and

the second sub-pixel comprises;

a second switching element connected to the first gate line and to the second data line;

a second liquid crystal capacitor connected to the second switching element having a capacitance smaller than the capacitance of the first liquid crystal capacitor;

and a second storage capacitor connected to the second switching element having a capacitance smaller than the capacitance of the first storage capacitor.

18. A liquid crystal display comprising:

a array of pixels arranged in the form of a matrix, wherein each pixel has a first sub-pixel and a second sub-pixel;

a plurality of first gate lines, one of the first gate lines being connected to one of the first sub-pixels; and

a plurality of first data lines, perpendicular to the first gate lines, one of the first data lines being connected to one of the first sub-pixels,

wherein each of the first sub-pixels comprises;

a first switching element connected to the first gate line and to the first data line;

a first liquid crystal capacitor connected to the first switching element; and

to a first storage capacitor; and

the each of second sub-pixels comprises;

a second switching element connected to at least one of the first gate line and the first data line;

a second liquid crystal capacitor connected to the second switching element having a capacitance smaller than the capacitance of the first liquid crystal capacitor;

and a second storage capacitor connected to the second switching element having a capacitance smaller than the capacitance of the first storage capacitor.

19. The liquid crystal display of claim 18, wherein a predetermined voltage is applied to the first sub-pixel, and the first sub-pixel receives a voltage greater than the voltage received by the second sub-pixel.

20. The liquid crystal display of claim 18, further comprising a plurality of second gate lines, one of the second gate lines being connected to one of the second switching elements, wherein the one of the second switching elements is connected to one of the first data lines.

21. The liquid crystal display of claim 18, further comprising a plurality of second data lines, one of the second data lines being connected to one of the second switching element, wherein the one of the second switching elements is connected to one of the first gate lines.