Liquid crystal panel and driver device thereof

• US 7,701,539 B2
• Filed: 04/02/2007
• Issued: 04/20/2010
• Est. Priority Date: 12/05/2006
• Status: Active Grant

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Shih, Po-Sheng, Pan, Hsuan-Lin
• Primary Examiner(s): Le, Uyen-Chau N
• Assistant Examiner(s): Chu, Chris H
• Application Number:
  US11/695,109
• Publication Number:
  US 20080129912A1
• Time in Patent Office: 1,114 Days
• Field of Search: None
• US Class Current: 349/139
• CPC Class Codes: G02F 1/13312 Circuits comprising photodetectors for purposes other than feedback
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line

Abstract

The invention provides a liquid crystal display panel, comprising a plurality of scan lines fabricated along a first axis, a plurality of data lines fabricated along a second axis, a first pixel and a second pixel. Each of the first and second pixels is surrounded by two adjacent scan lines and two adjacent data lines. The first pixel comprises a first thin film transistor (TFT). The second pixel comprises a second and a third TFT. The gates of the second and third TFT are electrically connected to the two adjacent scan lines surrounding the second pixel, respectively. The third TFT further comprises a source electrically connected to a photo-sensor, and a drain electrically connected to an access line fabricated along the second axis. One end of the access line is electrically connected to a signal processor via a switch.

Claims

1. A liquid crystal display panel, comprising:

a plurality of scan lines, fabricated along a first axis;

a plurality of data lines, fabricated along a second axis, perpendicular to the scan lines and transmitting data into the liquid crystal panel;

an access line, fabricated along the second axis;

a first pixel and a second pixel, each surrounded by two adjacent scan lines and two adjacent data lines, wherein the second pixel comprises a photo sensor coupled to the access line; and

a fan-out line and a switch,

wherein the fan-out line couples the access line to the switch, the switch controls a electrically connection between the fan-out line and a signal processor, and the access line is floating when the switch is turned off.

2. The liquid crystal display panel as claimed in claim 1, wherein the first pixel further comprises:

a first thin film transistor having a gate electrically connected to one of the two adjacent scan lines, a source electrically connected to one of the two adjacent data lines, and a drain electrically connected to a first pixel electrode.

3. The liquid crystal display panel as claimed in claim 2, wherein the second pixel comprises:

a second thin film transistor and a third thin film transistor,

wherein gates of the second and third thin film transistors are electrically connected to the two adjacent scan lines surrounding the second pixel, respectively,

wherein the second thin film transistor further has a source electrically connected to one of the two adjacent data lines surrounding the second pixel, and has a drain electrically connected to a second pixel electrode,

wherein the third thin film transistor further has a source electrically connected to the photo-sensor, and has a drain electrically connected to the access line.

4. The liquid crystal display panel as claimed in claim 3, wherein the photo-sensor is implemented by a fourth thin film transistor having a gate and a source both electrically connected to a bias voltage line, and a drain electrically connected to the source of the third thin film transistor.

5. The liquid crystal display panel as claimed in claim 4, wherein the bias voltage line is biased in a constant voltage level.

6. The liquid crystal display panel as claimed in claim 3, wherein the switch is turned on when the third thin film transistor is turned on.

7. The liquid crystal display panel as claimed in claim 3, wherein the scan line connected to the gate of the third thin film transistor is connected to the gate of one of the first thin film transistors.

8. The liquid crystal display panel as claimed in claim 7, wherein the switch is turned on when the third thin film transistor and the first thin film transistor that is connected with the third thin film transistor are turned on.

9. The liquid crystal display panel as claimed in claim 1, wherein the switch is implemented via metal oxide semiconductor.

10. The liquid crystal display panel as claimed in claim 1, wherein an on-resistance of the switch is greater than resistance of the access line and the fan-out line.

11. A liquid crystal display panel, comprising:

a plurality of scan lines fabricated along a first axis;

a plurality of data lines fabricated along a second axis;

an access line, fabricated along the second axis;

a first pixel, surrounded by two adjacent scan lines and two adjacent data lines;

a second pixel, surrounded by two adjacent scan lines and two adjacent data lines, and comprising a photo sensor coupled to the access line; and

a fan-out line and a switch,

wherein the fan-out line couples the access line to the switch, and the switch controls a electrically connection between the fan-out line and a signal processor, and the access line is floating when the switch is turned off.

12. The liquid crystal display panel as claimed in claim 11, wherein the first pixel comprises a first thin film transistor.

13. The liquid crystal display panel as claimed in claim 12, wherein the first thin film transistor comprises a gate electrically connected to one of the two adjacent scan lines surrounding the first pixel, and a source electrically connected to one of the two adjacent data lines surrounding the first pixel.

14. The liquid crystal display panel as claimed in claim 13, wherein the first thin film transistor further comprises a drain electrically connected to a first pixel electrode.

15. The liquid crystal display panel as claimed in claim 11, wherein the second pixel comprises a second thin film transistor and a third thin film transistor.

16. The liquid crystal display panel as claimed in claim 15, wherein the gates of the second and third thin film transistor are electrically connected to the two adjacent scan lines surrounding the second pixel, respectively.

17. The liquid crystal display panel as claimed in claim 16, wherein the second thin film transistor further comprises a source electrically connected to one of the two adjacent data lines surrounding the second pixel, and a drain electrically connected to a second pixel electrode.

18. The liquid crystal display panel as claimed in claim 17, wherein the third thin film transistor further comprises a source electrically connected to the photo-sensor, and a drain electrically connected to the access line.

19. The liquid crystal display panel as claimed in claim 18, wherein the switch is turned on when the third thin film transistor is turned on.

20. The liquid crystal display panel as claimed in claim 11, wherein an on-resistance of the switch is greater than resistance of the access line and the fan-out line.