Pixel structure

• US 10,163,412 B2
• Filed: 04/29/2015
• Issued: 12/25/2018
• Est. Priority Date: 11/19/2014
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lin, Hung-Che, Tsao, Cheng-Han, Ho, Sheng-Ju, Wu, Shang-Jie
• Primary Examiner(s): Briggs, Nathanael R
• Assistant Examiner(s): Quash, Anthony G
• Application Number:
  US14/700,127
• Publication Number:
  US 20160140915A1
• Time in Patent Office: 1,336 Days
• Field of Search: None
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A pixel structure is provided. The pixel structure includes a scan line and a data line, an active device, a pixel electrode, and a common electrode. The active device is electrically connected to the scan line and the data line. The pixel electrode is electrically connected to the active device. The common electrode is disposed to overlap with the pixel electrode. The common electrode is coupled to the pixel electrode to form a first storage capacitor and a second storage capacitor. The first storage capacitor and the second storage capacitor commonly use the pixel electrode as an upper electrode.

Claims

1. A pixel structure, comprising:

a scan line and a data line;

an active device, electrically connected to the scan line and the data line;

a pixel electrode, electrically connected to the active device; and

a common electrode, disposed to overlap with the pixel electrode, wherein the common electrode comprises a first lower electrode and a second lower electrode being separated from each other, the first lower electrode is coupled to the pixel electrode to form a first storage capacitor, and the second lower electrode is coupled to the pixel electrode to form a second storage capacitor, wherein the first storage capacitor and the second storage capacitor commonly use the pixel electrode as an upper electrode, wherein

the first lower electrode comprises;

a first main portion, disposed along a direction of the scan line; and

at least one first branch portion, connected to the first main portion and disposed along a direction of the data line, wherein the at least one first branch portion is located between the pixel electrode and the data line, and

the second lower electrode comprises;

a second main portion, disposed along the direction of the scan line, wherein the first main portion and the second main portion are electrically connected to a common voltage; and

at least one second branch portion, connected to the second main portion and disposed along the direction of the data line, wherein the at least one second branch portion is located between the pixel electrode and the data line, and the at least one second branch portion is structurally separated from the at least one first branch portion,

wherein the pixel electrode has a first edge and a second edge opposite to each other and a third edge and a fourth edge opposite to each other, the first main portion is disposed to overlap with the first edge, the second main portion is disposed to overlap with the second edge, the at least one first branch portion is disposed to overlap with the third edge and the fourth edge, and the at least one second branch portion is disposed to overlap with the third edge and the fourth edge.

2. The pixel structure of claim 1, wherein the first main portion and the second main portion cross over the data line to partially overlap with the data line.

3. The pixel structure of claim 1, wherein a gap is provided between the data line and the at least one first branch portion and between the data line and the at least one second branch portion, and the gap is less than 2.5 μ

m.

4. The pixel structure of claim 1, wherein the at least one first branch portion and the at least one second branch portion partially overlap with the data line.

5. The pixel structure of claim 1, wherein

the first main portion is coupled to the pixel electrode and the at least one first branch portion is coupled to the pixel electrode so as to form the first storage capacitor, and the first storage capacitor has a first capacitance Ca,

the second main portion is coupled to the pixel electrode and the at least one second branch portion is coupled to the pixel electrode so as to form the second storage capacitor, and the second storage capacitor has a second capacitance Cb, wherein Ca/2<

Cb.

6. The pixel structure of claim 1, wherein the first main portion and the second main portion are structurally connected together to be commonly and electrically connected to the common voltage.

7. The pixel structure of claim 1, wherein the first main portion is electrically connected to a first pad, the second main portion is electrically connected to a second pad, and the first pad and the second pad are electrically connected to the common voltage.

8. A pixel structure, comprising:

a scan line and a data line;

an active device, electrically connected to the scan line and the data line;

a pixel electrode, electrically connected to the active device; and

a common electrode, overlapped with the pixel electrode and comprising a first lower electrode and a second lower electrode , wherein

the first lower electrode is coupled to the pixel electrode to form a first storage capacitor, and the first lower electrode comprises a first main portion and at least one first branch portion connected to the first main portion, and

the second lower electrode is coupled to the pixel electrode to form a second storage capacitor, and the second lower electrode comprises a second man portion and at least one second branch portion connected to the second main portion , wherein the at least one first branch portion and the at least one second branch portion are structurally separately from one another, and the first main portion and the second main portion are electrically connected to a common voltage,

wherein the pixel electrode has a first edge and a second edge opposite to each other and a third edge and a fourth edge opposite to each other, the first main portion is disposed to overlap with the first edge, the second main portion is disposed to overlap with the second edge, the at least one first branch portion is disposed to overlap with the third edge and the fourth edge, and the at least one second branch portion is disposed to overlap with the third edge and the fourth edge.

9. The pixel structure of claim 8, wherein the first main portion is disposed along a direction of the scan line, and the at least one first branch portion is disposed along a direction of the data line, wherein the at least one first branch portion is located between the pixel electrode and the data line.

10. The pixel structure of claim 9, wherein the second main portion is disposed along the direction of the scan line, and the at least one second branch portion is disposed along the direction of the data line, wherein the at least one second branch portion is located between the pixel electrode and the data line.

11. The pixel structure of claim 8, wherein the first main portion and the second main portion cross over the data line to partially overlap with the data line.

12. The pixel structure of claim 8, wherein a gap is provided between the data line and the at least one first branch portion and between the data line and the at least one second branch portion, and the gap is less than 2.5 μ

m.

13. The pixel structure of claim 8, wherein the at least one first branch portion and the at least one second branch portion partially overlap with the data line.

14. The pixel structure of claim 8, wherein

the first main portion is coupled to the pixel electrode and the at least one first branch portion is coupled to the pixel electrode so as to form the first storage capacitor, and the first storage capacitor has a first capacitance Ca,

the second main portion is coupled to the pixel electrode and the at least one second branch portion is coupled to the pixel electrode so as to form the second storage capacitor, and the second storage capacitor has a second capacitance Cb, wherein Ca/2<

Cb.

15. The pixel structure of claim 8, wherein the first main portion and the second main portion are structurally connected together to be commonly and electrically connected to the common voltage.