Display device including compensation capacitors with different capacitance values

Patent metadata

Field	Value
Publication number	US-9599848-B2
Application number	US-201414301489-A
Country	US
Kind code	B2
Filing date	Jun 11, 2014
Priority date	Oct 30, 2009
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

An exemplary display device providing touch function includes scanning lines and data lines thereby defining lots of sub-pixel units. Each sub-pixel unit includes a pixel electrode, a storage capacitor, a compensation capacitor connected between the pixel electrode and a corresponding scanning line. In each pixel unit defined by n number adjacent sub-pixel units, both of a ratio of capacitance values between the storage capacitors formed in the corresponding sub-pixel units and a ratio of capacitance values between the corresponding compensation capacitors are respectively substantially equal to a ratio of areas between the corresponding pixel electrodes.

First claim

What is claimed is:

1. A display device, comprising:
a plurality of parallel scanning lines;
a plurality of parallel data lines intersecting with the scanning lines thereby defining a plurality of sub-pixel units, each sub-pixel unit comprising:
a pixel electrode;
a storage capacitor electrode, the storage capacitor electrode, the pixel electrode and an insulating layer sandwiched therebetween forming a storage capacitor; and
a compensation capacitor connected between the pixel electrode and a corresponding scanning line;

wherein a pixel unit comprises a plurality of sub-pixel units, and the plurality of sub-pixel units comprise a first sub-pixel unit and a second sub-pixel unit, an area of the pixel electrode of the second sub-pixel unit is smaller than an area of the pixel electrode of the first sub-pixel unit, and a capacitance value of the storage capacitor of the second sub-pixel unit is smaller than a capacitance value of the storage capacitor of the first sub-pixel unit, and a capacitance value of the compensation capacitor of the second sub-pixel unit is smaller than a capacitance value of the compensation capacitor of the first sub-pixel unit.

2. The display device of claim 1 , wherein each sub-pixel unit further comprises a thin film transistor, and the thin film transistor comprises a gate electrode, a first electrode and a second electrode, which are connected to a corresponding scanning line, a corresponding data line and a corresponding pixel electrode, respectively.

3. The display device of claim 2 , wherein each compensation capacitor is formed by a corresponding gate electrode, the second electrode facing towards the gate electrode, and an insulating layer sandwiched between the gate electrode and the second electrode.

4. The display device of claim 1 , wherein the number N of sub-pixel units of each pixel unit are connected to the same scanning line.

5. The display device of claim 4 , further comprising a color filter layer, wherein the number N of sub-pixel units correspond to a red color unit, a green color unit and a blue color unit of the color filter layer.

6. The display device of claim 1 , wherein for the at least one sub-pixel unit that comprises the pixel electrode having an area different from the area of the pixel electrode of at least one other sub-pixel unit, such at least one sub-pixel unit further comprises a detection element configured to generate a control signal when such at least one sub-pixel unit is touched.

7. The display device of claim 6 , wherein the detection element is located adjacent to the pixel electrode of such at least one sub-pixel unit.

8. The display device of claim 1 , wherein the storage capacitor electrode is formed by at least one extending portion extending from a corresponding scanning line.

9. The display device of claim 1 , further comprising a plurality of common lines arranged parallel to each other, wherein each common line is located between two adjacent scanning lines, and the storage capacitor electrode extends from a corresponding common line.

10. A display device, comprising:
a plurality of liquid crystal molecules;
a plurality of parallel scanning lines;
a plurality of parallel data lines intersecting with the scanning lines thereby defining a plurality of sub-pixel units, each sub-pixel unit comprising:
a pixel electrode;
a common electrode, the common electrode, the pixel electrode and the liquid crystal molecules sandwiched there between forming a liquid crystal capacitor;
a storage capacitor connected in parallel to the liquid crystal capacitor; and
a compensation capacitor connected between the pixel electrode and a corresponding scanning line;

wherein a pixel unit comprises a first sub-pixel unit and a second sub-pixel unit, an area of the pixel electrode of the second sub-pixel unit is smaller than an area of the pixel electrode of the first sub-pixel unit, and a capacitance value of the storage capacitor of the second sub-pixel unit is smaller than a capacitance value of the storage capacitor of the first sub-pixel unit, and a capacitance value of the compensation capacitor of the second sub-pixel unit is smaller than a capacitance value of the compensation capacitor of the first sub-pixel unit.

11. The display device of claim 10 , wherein each sub-pixel unit further comprises a thin film transistor, and the thin film transistor comprises a controlling electrode, a first electrode and a second electrode, which are connected to a corresponding scanning line, a corresponding data line and a corresponding pixel electrode, respectively.

12. The display device of claim 11 , wherein each compensation capacitor is formed by a corresponding controlling electrode, the second electrode facing towards the gate electrode and an insulating layer sandwiched each other.

13. The display device of claim 10 , wherein the N number sub-pixel units of each pixel unit are connected to the same scanning line.

14. The display device of claim 13 , wherein the N number sub-pixel units correspond to a red color unit, a green color unit and a blue color unit of a color filter layer applied to the display device.

15. The display device of claim 10 , wherein in each pixel unit, at least one sub-pixel unit comprises a detection element configured to generate a control signal when the at least one sub-pixel unit is touched.

16. The display device of claim 15 , wherein the detection element is located adjacent to the pixel electrode of the at least one sub-pixel unit.

17. The display device of claim 10 , wherein in each sub-pixel unit, a storage capacitor electrode of the storage capacitor extends from a corresponding scanning line, and cooperates with the pixel electrode facing towards the storage capacitor electrode and an insulating layer sandwiched between the pixel electrode and the storage capacitor electrode to form the storage capacitor.

18. The display device of claim 10 , further comprising a plurality of common lines arranged parallel to each other and each common line located between two adjacent scanning lines, wherein a storage capacitor electrode of each storage capacitor extends from a corresponding common line, and cooperates with a corresponding pixel electrode and an insulating layer sandwiched between the corresponding common line and the corresponding pixel electrode to form the storage capacitor.

19. A display device, comprising:
a plurality of pixel units each defined by a predetermined number N of adjacent sub-pixel units, at least one of the pixel units comprising a detection element configured to generate a control signal when the at least one pixel unit is touched, and each sub-pixel unit comprising:
a pixel electrode;
a storage capacitor; and
a compensation capacitor;

wherein in the at least one pixel unit having the detection element, the detection element is provided in a green color unit of the sub-pixel units and the size of the pixel electrode of the green color unit is correspondingly reduced, and a capacitance value of the storage capacitor of the green color unit is smaller than capacitance values of the storage capacitors of the other sub-pixel units of the predefined number N of the sub-pixel units, and a capacitance value of the compensation capacitor of the green color unit is smaller than capacitance values of the compensation capacitors of the other sub-pixel units.

Assignees

• Innolux Corp

Inventors

• Shih Po-Sheng
• Chen Po-Yang

Classifications

• G02F2001/134345

  Physics · mapped topic

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title