Liquid crystal display backplane layouts and addressing for non-standard subpixel arrangements

• US 20040246404A1
• Filed: 06/06/2003
• Published: 12/09/2004
• Est. Priority Date: 06/06/2003
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Credelle, Thomas Lloyd, Elliott, Candice Hellen Brown, Han, Seok Jin, Schlegel, Matthew Osborne
• Granted Patent: US 7,397,455 B2
• Time in Patent Office: Days
• US Class Current: 349/88
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

Liquid crystal display backplane layouts and addressing for non-standard subpixel arrangements are disclosed. A liquid crystal display comprises a panel and a plurality of transistors. The panel substantially comprises a subpixel repeating group having an even number of subpixels in a first direction. Each thin film transistor connects one subpixel to a row and a column line at an intersection in one of a group of quadrants. The group comprises a first quadrant, a second quadrant, a third quadrant and a fourth quadrant, wherein the thin film transistors are formed in a backplane structure adjacent to intersections of the row and column lines. The thin film transistors are also substantially formed in more than one quadrant in the backplane structure.

Claims

1. A liquid crystal display comprising:

a panel substantially comprising a subpixel repeating group having an even number of subpixels in a first direction; and

a plurality of thin film transistors, each thin film transistor connecting one subpixel to a row and a column line at an intersection in one of a group of quadrants, the group comprising a first quadrant, a second quadrant, a third quadrant and a fourth quadrant, wherein the thin film transistors are formed in a backplane structure adjacent to intersections of the row and column lines, the thin film transistors are substantially formed in more than one quadrant in the backplane structure.

2. The liquid crystal display of claim 1, wherein the panel has a dot inversion scheme driving the subpixels.

3. The liquid crystal display of claim 2, wherein the dot inversion scheme is 1×

1 dot inversion scheme.

4. The liquid crystal display of claim 2, wherein the dot inversion scheme is 1×

2 dot inversion scheme.

5. The liquid crystal display of claim 2, wherein substantially every two incidences of a same colored subpixels along the first direction have a different polarity.

6. The liquid crystal display of claim 5, wherein the first direction is a row direction.

7. The liquid crystal display of claim 5, wherein the first direction is a column direction.

8. The liquid crystal display of claim 2, wherein the panel has at least a first region and a second region of subpixels such that each thin film transistor associated with subpixels in the first region is formed at substantially in a first numbered quadrant, each thin film transistor associated with subpixels in the second region is formed at substantially in a second numbered quadrant, and the first numbered quadrant is different from the second numbered quadrant.

9. The liquid crystal display of claim 1, wherein the subpixel repeating group substantially comprises the pattern:

10. The liquid crystal display of claim 1, wherein the subpixel repeating group substantially comprises the pattern:

11. The liquid crystal display of claim 1, wherein the subpixel repeating group substantially comprises the pattern:

12. A method for performing dot inversion of a liquid crystal display, the display comprising a panel substantially comprising a subpixel repeating group having an even number of subpixel in a first direction, the method comprising:

choosing a subpixel repeating group having an even number of subpixels in a first direction;

choosing a dot inversion scheme to drive the subpixels; and

placing thin film transistors in a backplane such that the transistors are substantially formed in different quadrants of the subpixels across the panel.

13. The method of claim 12, wherein placing thin film transistors reduces any image degradation due to parasitic capacitances at the subpixel.

14. The method of claim 12, wherein the dot inversion scheme is 1×

1 dot inversion scheme.

15. The method of claim 12, wherein said dot inversion scheme is 1×

2 dot inversion scheme.

16. The method of claim 12, wherein the subpixel repeating group substantially comprises the pattern:

17. The method of claim 12 wherein said subpixel repeating group substantially comprises the pattern:

18. The method of claim 12 wherein said subpixel repeating group substantially comprises the pattern:

19. A liquid crystal display comprising:

a panel substantially comprising a plurality of subpixel repeating groups, each group comprising a four subpixel group, each subpixel having an associated thin film transistor with a gate, source, and drain, and wherein the gate of each thin film transistor is connected to a row line such that same colored subpixels in the group are staggered across each row of the group with opposite polarity.

20. The liquid crystal display of claim 19, further comprising:

a least two adjacent subpixel repeating groups, and

a row line that connects to transistors of the adjacent subpixel repeating groups such that same colored subpixels in a same row having alternating polarity.