Liquid crystal display panel with auxiliary line disposed between boundary data line and pixel electrode and driving method thereof

• US 8,035,588 B2
• Filed: 03/02/2007
• Issued: 10/11/2011
• Est. Priority Date: 03/03/2004
• Status: Active Grant

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Pan, Hsuan-Lin, Shih, Po-Sheng
• Primary Examiner(s): Nguyen; Chanh
• Assistant Examiner(s): Park; Sanghyuk
• Application Number:
  US11/681,753
• Publication Number:
  US 20070146278A1
• Time in Patent Office: 1,684 Days
• Field of Search: 345 87-108, 349/37, 349/39, 349/73, 349/84
• US Class Current: 345/87
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2310/0232 Special driving of display border areas
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

A liquid crystal display panel and its driving method are provided. The liquid crystal display panel includes: a plurality of scanning lines and data lines; a pixel matrix having a plurality of pixels which are formed in the intersections of the scanning lines and the data lines; and each of the pixels having: a pixel electrode; a control electrode; a first thin film transistor having a gate electrode connected to the scanning line, a first electrode connected to the data line and a second electrode connected to the pixel electrode; a second thin film transistor having a gate electrode connected to another adjacent scanning line, a first electrode connected to another adjacent data line and a second electrode connected to the control electrode; and wherein one of the two most outside data lines of the pixel matrix is called a boundary data line, and an auxiliary line is disposed between the boundary data line and the pixel electrode adjacent to the boundary data line.

Claims

1. A liquid crystal display panel, comprising:

a plurality of scanning lines;

a plurality of data lines for transmitting data signals;

a pixel matrix having a plurality of pixels which are formed in the intersections of said scanning lines and said data lines, and said pixel comprising;

a pixel electrode;

a control electrode;

a first thin film transistor having a gate electrode connected to said scanning line, a first electrode connected to said data line and a second electrode connected to said pixel electrode;

a second thin film transistor having a gate electrode connected to another adjacent said scanning line, a first electrode connected to another adjacent said data line and a second electrode connected to said control electrode; and

wherein one of the two most outside said data lines of said pixel matrix is called a boundary data line, and an auxiliary line is disposed between said boundary data line and said pixel electrode adjacent to said boundary data line, one of the terminals of said boundary data line is directly electrically connected to another said data line not being adjacent to said boundary data line without through other electronic element, and said boundary data line, said adjacent pixel electrode and said auxiliary line are all located in a same first or last pixel column, and said auxiliary line is a straight line passing through all the pixels of the same first or last pixel column and has no direct connection with any voltage as well as with a liquid crystal capacitor of each of said pixels.

2. The liquid crystal display panel of claim 1, wherein the polarity of said boundary data line is opposing to that of its adjacent said data line.

3. The liquid crystal display panel of claim 1, wherein said auxiliary line is located between said boundary data line and said control electrode adjacent to it.

4. The liquid crystal display panel of claim 3, wherein said auxiliary line and its adjacent said pixel electrode constitute the two electrodes of a first capacitor.

5. The liquid crystal display panel of claim 4, wherein said auxiliary line and its adjacent said control electrode constitute the two electrodes of a second capacitor.

6. The liquid crystal display panel of claim 5, wherein said auxiliary line and said boundary data line constitute the two electrodes of a third capacitor.

7. The liquid crystal display panel of claim 6, wherein there is a interval between said auxiliary line and said boundary data line to make the value of said third capacitor is smaller than that of said first capacitor or said second capacitor.

8. The liquid crystal display panel of claim 7, wherein said interval is substantially equal to the width of each of said pixels.

9. The liquid crystal display panel of claim 1, wherein the area between said auxiliary line and the other one of said two most outside said data lines is a display area of said liquid crystal display panel.

10. The liquid crystal display panel of claim 9, wherein said thin film transistor connected to said boundary data line is located outside or inside said display area.

11. The liquid crystal display panel of claim 1, wherein said boundary data line is located outside the display area of said liquid crystal display panel, and there is a minimum interval between said auxiliary and said boundary data lines which are parallel with each other, and said minimum interval is substantially equal to a width of each of said pixels.

12. A liquid crystal display panel, comprising:

a pixel matrix having n pixel columns and m pixel rows;

a plurality of pixels which are formed in the intersections of n+1 data lines and m+1 scanning lines of said pixel matrix, wherein said pixel comprises;

at least two thin film transistors and a pixel electrode, and said pixel is controlled through the signals respectively provided by two adjacent said data lines of said pixel; and

wherein the first said data line or the n+1th said data line of said pixel matrix is called a boundary data line, and an auxiliary line is disposed between its adjacent said pixel electrode and said boundary data line, one of the terminals of said boundary data line is directly electrically connected to another said data line not being adjacent to said boundary data line without through other electronic element, and said boundary data line, said adjacent pixel electrode and said auxiliary line are all located in a same first or last pixel column, and said auxiliary line is a straight line passing through all the pixels of the same first or last pixel column and has no direct connection with any voltage as well as with a liquid crystal capacitor of each of said pixels.

13. The liquid crystal display panel of claim 12, wherein the polarity of said boundary data line is opposing to that of its adjacent said data line.

14. The liquid crystal display panel of claim 12, wherein the connecting point of said boundary data line and said another said data line is located outside said pixel matrix.

15. The liquid crystal display panel of claim 12, further comprises a driver for providing n data signals corresponding to said data lines except for the first said data line, wherein said first said data line is said boundary data line.

16. The liquid crystal display panel of claim 12, further comprises a driver for providing n data signals corresponding to said data lines except for the n+1th said data line, wherein said n+1th said data line is said boundary data line.

17. The liquid crystal display panel of claim 12, wherein said first data line and said n+1th said data line are respectively the two most outside said data lines of said pixel matrix, and the area between said auxiliary line and the other one of said two most outside said data lines is a display area of said liquid crystal display panel.

18. The liquid crystal display panel of claim 17, wherein said thin film transistor which is connected to said boundary data line is located outside or inside said display area.

19. The liquid crystal display panel of claim 12, wherein there is an interval between said auxiliary line and its adjacent said data line, and said interval is substantially equal to the width of other said pixel column.

20. The liquid crystal display panel of claim 12, wherein said auxiliary line and its adjacent said pixel electrode constitute the two electrodes of a first capacitor.

21. The liquid crystal display panel of claim 20, wherein said auxiliary line and said boundary data line constitute the two electrodes of a second capacitor.

22. The liquid crystal display panel of claim 21, wherein there is a interval between said auxiliary line and said boundary data line to make the value of said second capacitor is smaller than that of said first capacitor.

23. The liquid crystal display panel of claim 12, wherein said pixel further comprises an another electrode connected to one of said two thin film transistors, and said auxiliary line is disposed between said another electrode and said boundary data line.

24. The liquid crystal display panel of claim 23, wherein said auxiliary line and its adjacent said control electrode constitute the two electrodes of a third capacitor.

25. The liquid crystal display panel of claim 12, wherein said boundary data line is located outside the display area of said liquid crystal display panel, and there is a minimum interval between said auxiliary and said boundary data lines which are parallel with each other, and said minimum interval is substantially equal to a width of each of said pixels.

26. A driving method for a liquid crystal display panel, wherein said liquid crystal display panel comprises:

a pixel matrix having n pixel columns and m pixel rows;

a plurality of pixels which are formed in the intersections of n+1 data lines and m+1 scanning lines of said pixel matrix, wherein said pixel is respectively coupled to its two adjacent data lines and two adjacent scanning lines, one of the two most outside said data lines of said pixel matrix is called a boundary data line, and an auxiliary line is disposed between its adjacent said pixel electrode and said boundary data line, said boundary data line, said adjacent pixel electrode and said auxiliary line are all located in a same first or last pixel column, said auxiliary line is a straight line passing through all the pixels of the same first or last pixel column and has no direct connection with any voltage as well as with a liquid crystal capacitor of each of said pixels, and said method comprises the steps of;

providing n data line signals respectively for said n+1 data lines, wherein said boundary data line and its non-adjacent said data line together share one of said n data line signals, wherein said auxiliary line and its adjacent said pixel electrode constitute a first capacitor; and

controlling said pixel through the data signals of said two adjacent data lines and the scanning signals of said two adjacent scanning lines for said pixel.

27. The driving method for a liquid crystal display panel of claim 26, the polarity of said boundary data line is opposing to that of its adjacent said data line.

28. The driving method for a liquid crystal display panel of claim 26, wherein said pixel further comprises at least two thin film transistors respectively coupled to said two adjacent scanning lines and a control electrode coupled to one of said two thin film transistors.

29. The driving method for a liquid crystal display panel of claim 28, wherein said auxiliary line and said control electrode constitute the two electrodes of a second capacitor.

30. The driving method for a liquid crystal display panel of claim 29, wherein said auxiliary line and said boundary data line constitute the two electrodes of a third capacitor.

31. The driving method for a liquid crystal display panel of claim 30, wherein the value of said third capacitor is smaller than that of said first capacitor or said second capacitor.

32. The driving method for a liquid crystal display panel of claim 26, wherein said boundary data line is located outside the display area of said liquid crystal display panel, and there is a minimum interval between said auxiliary and said boundary data lines which are parallel with each other, and said minimum interval is substantially equal to a width of each of said pixels.