Display apparatus including touch electrode

• US 9,377,913 B2
• Filed: 12/24/2013
• Issued: 06/28/2016
• 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
• Assistant Examiner(s): BRITTINGHAM, NATHANIEL P
• Application Number:
  US14/140,240
• Publication Number:
  US 20140210774A1
• Time in Patent Office: 917 Days
• Field of Search: None
• US Class Current: 1/1
• 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 common electrode, wherein the common electrode together with the pixel electrode forms an electric field so as to display 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, the common electrode including;

two or more touch sensing electrodes formed by patterning the common electrode in a column direction, for sensing the capacitance change in accordance with the user'"'"'s touch, and

two or more touch driving electrodes formed by patterning the common electrode in the column direction and a row direction, each of the two or more touch driving electrodes positioned between two of the touch sensing electrodes and supplied with a touch driving signal for sensing the user'"'"'s touch; and

a liquid crystal layer of vertical alignment (VA) mode formed 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 common electrode,

wherein the upper panel further includes;

a light-shielding portion, formed on an upper substrate, for preventing light leakage, and

a touch wiring formed in the upper panel in a region overlapped with the light-shielding portion, the touch wiring connected between the two or more touch driving electrodes.

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

a color filter, formed on the light-shielding portion, for representing colors by filtering light being incident from the lower panel, the common electrode formed on the color filter; and

an insulating layer formed on the common electrode,

wherein the touch wiring is formed on the insulating layer.

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

a color filter, formed on the light-shielding portion, for representing colors by filtering light being incident from the lower panel; and

an insulating layer formed on the touch wiring, the common electrode formed on the insulating layer,

wherein the touch wiring is formed on the color filter.

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

a color filter, formed on the common electrode, for representing colors by filtering light being incident from the lower panel, the common electrode formed on the light shielding portion; and

an insulating layer formed on the color filter,

wherein the touch wiring is formed on the insulating layer.

5. 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 on a display panel and the touch sensing mode for sensing the user'"'"'s touch for one frame period.

6. The display apparatus of claim 1, wherein the touch wiring comprises a touch sensing line extending from one end of the column direction of a touch sensing electrode of the two or more touch sensing electrodes and a touch driving line extending in the column direction from one end of the row direction of the upper panel, the touch driving line for connecting the two or more touch driving electrodes in the row direction.

7. The display apparatus of claim 6, further comprising:

a touch driver, which is connected with the touch sensing line and the touch driving line, 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.

8. The display apparatus of claim 1, wherein the touch wiring comprises a touch sensing line extending from one end of the column direction of a touch sensing electrode of the touch sensing electrodes and a touch driving line extending from a touch driving electrode of the touch driving electrodes in the column direction, the touch driving line electrically connecting the two or more touch driving electrodes arranged in a same row, in the row direction at one end of the column direction of the upper panel.

9. The display apparatus of claim 8, further comprising:

a touch driver, connected with the touch sensing line and the touch driving line, for applying the touch driving signal to the touch driving electrode, and sensing the capacitance change from the touch sensing electrode.

10. 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 common electrode, the common electrode comprising;

two or more touch sensing electrodes formed by patterning the common electrode in a column direction, for sensing a capacitance change in accordance with a user'"'"'s touch for a touch sensing mode, and

two or more touch driving electrodes formed by patterning the common electrode in the column direction and a row direction, each of the two or more touch driving electrodes positioned between two of the touch sensing electrodes and supplied with a touch driving signal for sensing the user'"'"'s touch,

a light-shielding portion, formed on an upper substrate, for preventing light leakage, and

a touch wiring formed in the upper panel in a region overlapped with the light-shielding portion, the touch wiring connecting one of the touch driving electrodes or one of the touch sensing electrodes with a touch driver; and

a liquid crystal layer between the upper panel and the lower panel.

11. The display apparatus of claim 10, wherein

one of the touch sensing electrodes is formed between the touch driving electrodes.

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

13. The display apparatus of claim 10, wherein the upper panel further includes:

a color filter, formed on the light-shielding portion, for representing colors by filtering light being incident from the lower panel, the common electrode formed on the color filter; and

an insulating layer formed on the common electrode,

wherein the touch wiring is formed on the insulating layer.

14. The display apparatus of claim 10, wherein the upper panel further includes:

a color filter, formed on the light-shielding portion, for representing colors by filtering light being incident from the lower panel; and

an insulating layer formed on the touch wiring, the common electrode formed on the insulating layer,

wherein the touch wiring is formed on the color filter.

15. The display apparatus of claim 10, wherein the upper panel further includes:

a color filter, formed on the common electrode, for representing colors by filtering light being incident from the lower panel, the common electrode formed on the light shielding portion; and

an insulating layer formed on the color filter,

wherein the touch wiring is formed on the insulating layer.

16. The display apparatus of claim 10, wherein the common electrode and the pixel electrode form an electric field so as to display an image for a displaying driving mode, and

wherein the liquid crystal layer is chaged in accordance with the electric field formed between the pixel electrode and the common electrode.