Display apparatus comprising a liquid crystal layer between a lower panel and an upper panel including a touch electrode

• US 10,282,043 B2
• Filed: 05/27/2016
• Issued: 05/07/2019
• Est. Priority Date: 01/30/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Tae Hwan, Park, Yong Chan, Hwang, Sang Soo, Park, Jin Woo
• Primary Examiner(s): Chang, Kent W
• Assistant Examiner(s): Brittingham, Nathaniel P
• Application Number:
  US15/167,816
• Publication Number:
  US 20160274704A1
• Time in Patent Office: 1,075 Days
• Field of Search: 345156-178
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

Disclosed is a display apparatus which facilitates to improve touch sensitivity by decreasing parasitic capacitance between a common electrode and gate/data lines, and decreasing delay on touch sensing and displaying driving, wherein the display apparatus may include a lower panel including a pixel electrode; an upper panel including the common electrode, wherein the common electrode together with the pixel electrode forms an electric field for displaying an image for a displaying driving mode, and the common electrode senses a capacitance change in accordance with a user'"'"'s touch for a touch sensing mode; and a liquid crystal layer of VA mode formed between the lower and upper panels, and changed in accordance with the electric field between the pixel and common electrodes.

Claims

1. A display apparatus comprising:

a lower panel including a pixel electrode in a pixel region defined by crossing gate and data lines;

an upper panel including;

a plurality of common electrodes, the plurality of common electrodes being separated from each other, the plurality of common electrodes together with the pixel electrode to form an electric field so as to display an image for a displaying driving mode, one or more of the plurality of common electrodes used to sense a capacitance change in accordance with a user'"'"'s touch for a touch sensing mode,

a light-shielding portion for preventing light leakage,

a first insulating layer on the plurality of common electrodes, the first insulating layer separating the plurality of common electrodes from each other,

a touch wiring in a region overlapped with the light-shielding portion, the touch wiring electrically connected to the one or more of the plurality of common electrodes through the first insulating layer, and

a second insulating layer on and in direct contact with both the first insulating layer and the touch wiring; and

a liquid crystal layer of vertical alignment (VA) mode disposed between the upper panel and the lower panel, wherein the liquid crystal layer is changed in accordance with the electric field formed between the pixel electrode and the plurality of common electrodes.

2. The display apparatus of claim 1, wherein the common electrodes include:

touch sensing electrodes in a column direction, for sensing the capacitance change in accordance with the user'"'"'s touch; and

touch driving electrodes in column and row directions, two or more of the touch driving electrodes positioned between two of the touch sensing electrodes, the touch driving electrodes supplied with a touch driving signal for sensing the user'"'"'s touch, and the touch sensing electrodes to sense the capacitance change.

3. The display apparatus of claim 2, wherein the touch wiring connects the two or more of the touch driving electrodes in the row direction over one of the touch sensing electrodes.

4. The display apparatus of claim 3, further comprising a touch driver for applying the touch driving signal to one of the touch driving electrodes, and sensing the capacitance change in accordance with the user'"'"'s touch from one of the touch sensing electrodes.

5. The display apparatus of claim 2, wherein the touch wiring connects the two or more of the touch driving electrodes arranged in a same row over another touch driving electrode in a different row.

6. The display apparatus of claim 5, further comprising a touch driver for applying the touch driving signal to the touch driving electrodes, and sensing the capacitance change from the touch sensing electrodes.

7. The display apparatus of claim 1, wherein the upper panel further includes:

a color filter disposed between the light-shielding portion and the common electrodes, the color filter for representing colors by filtering light being incident from the lower panel.

8. The display apparatus of claim 1, wherein the upper panel further includes:

a color filter disposed between the first insulating layer and the common electrodes, the color filter for representing colors by filtering light being incident from the lower panel, the touch wiring formed on the color filter, the touch wiring connected to the one or more of the common electrodes through the first insulating layer and through the color filter.

9. The display apparatus of claim 1, further comprising a timing controller for driving one frame by a time-division method so as to alternately drive the displaying driving mode for displaying the image and the touch sensing mode for sensing the user'"'"'s touch for one frame period.

10. The display apparatus of claim 1, wherein the plurality of common electrodes include touch sensing electrodes disposed in column and row directions, for sensing the capacitance change in accordance with the user'"'"'s touch, wherein the touch wiring is connected to one of the touch sensing electrodes over another touch sensing electrode.

11. A display apparatus comprising:

a lower panel including a pixel electrode in a pixel region defined by crossing gate and data lines;

an upper panel including;

a plurality of common electrodes together with the pixel electrode to form an electric field to display an image for a displaying driving mode, one or more of the plurality of common electrodes used to sense a capacitance change in accordance with a user'"'"'s touch for a touch sensing mode, the plurality of common electrodes being separated from each other,

a light-shielding portion for preventing light leakage, a touch wiring in a region overlapped with the light-shielding portion, the touch wiring electrically connected to the one or more of the plurality of common electrodes, and

an insulating layer disposed between the touch wiring and the plurality of common electrodes, the insulating layer in direct contact with the touch wiring; and

a liquid crystal layer of vertical alignment (VA) mode disposed between the upper panel and the lower panel, wherein the liquid crystal layer is changed in accordance with the electric field formed between the pixel electrode and the plurality of common electrodes,

wherein the touch wiring is connected to the one or more of the plurality of common electrodes through the insulating layer.

12. The display apparatus of claim 11, wherein one of the common electrodes and another one of the common electrodes are electrically connected to each other through the touch wiring.

13. The display apparatus of claim 11, wherein the upper panel further includes:

a color filter for representing colors by filtering light being incident from the lower panel, the color filter covering the light shielding portion,

wherein the touch wiring is in contact with the one or more of the common electrodes through the color filter.

14. The display apparatus of claim 11, wherein the common electrodes include:

touch sensing electrodes in a column direction, for sensing the capacitance change in accordance with the user'"'"'s touch; and

touch driving electrodes in column and row directions, two or more of the touch driving electrodes positioned between two of the touch sensing electrodes, the touch driving electrodes supplied with a touch driving signal for sensing the user'"'"'s touch, the touch sensing electrodes to sense the capacitance change.

15. The display apparatus of claim 14, wherein the touch wiring connects the two or more of the touch driving electrodes in the row direction over one of the touch sensing electrodes.

16. The display apparatus of claim 14, wherein the touch wiring connects the two or more of the touch driving electrodes arranged in a same row over another touch driving electrode in a different row.

17. The display apparatus of claim 11, wherein the plurality of common electrodes include touch sensing electrodes disposed in column and row directions, for sensing the capacitance change in accordance with the user'"'"'s touch, wherein the touch wiring is connected to one of the touch sensing electrodes over another touch sensing electrode.

18. The display apparatus of claim 11, further comprising a timing controller for driving one frame by a time-division method so as to alternately drive the displaying driving mode for displaying the image and the touch sensing mode for sensing the user'"'"'s touch for one frame period.

19. The display apparatus of claim 15, further comprising a touch driver sensing the capacitance change in accordance with the user'"'"'s touch from the common electrodes.