Display device with integrated touch screen having dummy electrodes

• US 9,342,177 B2
• Filed: 12/23/2013
• Issued: 05/17/2016
• Est. Priority Date: 09/25/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Seo, Seong-Mo, Kim, Tae-Hwan
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): Ritchie, Darlene M
• Application Number:
  US14/138,334
• Publication Number:
  US 20150084912A1
• Time in Patent Office: 876 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A display device with an integrated touch screen includes a panel divided into a display area and a non-display area and including m (m is a natural number) driving electrodes, m signal lines and dummy electrodes; a display driver IC applying a common voltage or a touch scan signal to the m driving electrodes through the m signal lines; and a touch IC generating the touch scan signal and providing the touch scan signal to the display driver IC, wherein the m driving electrodes are disposed in the display area and the dummy electrodes are disposed in the non-display area, and wherein the dummy electrodes are adjacent to the driving electrodes in a peripheral region of the display area.

Claims

1. A display device with an integrated touch screen, comprising:

a panel divided into a display area and a non-display area and including m (m is a natural number) driving electrodes, m signal lines, a plurality of dummy electrodes, and a plurality of auxiliary lines, each of the dummy electrodes being connected to one of the auxiliary lines;

a display driver IC applying a common voltage or a touch scan signal to the m driving electrodes through the m signal lines; and

a touch IC generating the touch scan signal and providing the touch scan signal to the display driver IC,

wherein the m driving electrodes are disposed in the display area and the dummy electrodes are disposed in the non-display area, and wherein the dummy electrodes are adjacent to the driving electrodes in a peripheral region of the display area;

wherein, when the panel is driven in a touch driving mode, the display driver IC applies the touch scan signal to the m driving electrodes through the m signal lines and to the dummy electrodes through the auxiliary lines, and the touch IC receives touch sensing signals according to the touch scan signal from the m driving electrodes through the m signal lines and from the dummy electrodes through the auxiliary lines; and

wherein each of the dummy electrodes is connected to the display driver IC through a corresponding one of the auxiliary lines.

2. The device according to claim 1, wherein the number of the driving electrodes arranged along each side of the display area is equal to the number of the dummy electrodes that are adjacent to the side of the display area and symmetrical to the driving electrodes arranged along the side of the display area.

3. The device according to claim 1, wherein at least one of the dummy electrodes has a bar shape.

4. The device according to claim 1, where there are four dummy electrodes which are bar-shaped.

5. The device according to claim 1, wherein the display driver IC includes a multiplexer such that the m driving electrodes are divided into groups and the touch scan signal is applied to the divided groups.

6. The device according to claim 1, wherein the touch IC includes:

a touch scan signal generation unit generating the touch scan signal; and

a touch sensing unit receiving touch sensing signals according to the touch scan signal from the m driving electrodes and detecting a location of a touch input on the panel.

7. The device according to claim 1, wherein the display driver IC applies the common voltage to the m driving electrodes through the m signal lines when the panel is driven in a display driving mode.

8. The device according to claim 7, wherein the display driver IC includes:

a common voltage generation unit generating the common voltage;

a synchronizing signal generation unit generating synchronizing signals instructing the panel to be driven in the display driving mode or the touch driving mode; and

a switching unit connecting the common voltage generation unit and the m driving electrodes or connecting the touch IC and the m driving electrodes depending on the synchronizing signals.

9. A display device with an integrated touch screen, comprising:

a panel divided into a display area and a non-display area and including m (m is a natural number) driving electrodes, m signal lines, a plurality of dummy electrodes, and a plurality of auxiliary lines, each of the dummy electrodes being connected to one of the auxiliary lines;

a display driver IC applying a common voltage or a touch scan signal to the m driving electrodes through the m signal lines; and

a touch IC generating the touch scan signal and providing the touch scan signal to the display driver IC,

wherein the m driving electrodes are disposed in the display area and the dummy electrodes are disposed in the non-display area, and wherein the dummy electrodes are adjacent to the driving electrodes in a peripheral region of the display area;

wherein each one of the plurality of dummy electrodes is physically disconnected from every other dummy electrode;

wherein, when the panel is driven in a touch driving mode, the display driver IC applies the touch scan signal to the m driving electrodes through the m signal lines and to the dummy electrodes through the auxiliary lines, and the touch IC receives touch sensing signals according to the touch scan signal from the m driving electrodes through the m signal lines and from the dummy electrodes through the auxiliary lines; and

wherein each of the dummy electrodes is connected to the display driver IC through a corresponding one of the auxiliary lines.

10. The device according to claim 9, wherein the number of the driving electrodes arranged along each side of the display area is equal to the number of the dummy electrodes that are adjacent to the side of the display area and symmetrical to the driving electrodes arranged along the side of the display area.

11. The device according to claim 9, wherein at least one of the dummy electrodes has a bar shape.

12. The device according to claim 9, where there are four dummy electrodes which are bar-shaped.

13. The device according to claim 9, wherein the panel includes a multiplexer such that the m driving electrodes are divided into groups and the touch scan signal is applied to the divided groups.

14. The device according to claim 9, wherein the touch IC includes:

a touch scan signal generation unit generating the touch scan signal; and

a touch sensing unit receiving the touch sensing signals according to the touch scan signal from the m driving electrodes to detect the location of the touch input on the panel.

15. The device according to claim 9, wherein the touch IC is integrated into the non-display area of the panel.

16. A display device with an integrated touch screen, comprising:

a panel divided into a display area and a non-display area and including m (m is a natural number) driving electrodes, m signal lines, and a plurality of dummy electrodes, and a plurality of auxiliary lines, each of the dummy electrodes being connected to one of the auxiliary lines;

a display driver IC applying a common voltage or a touch scan signal to the m driving electrodes through the m signal lines; and

a touch IC generating the touch scan signal and providing the touch scan signal to the display driver IC,

wherein the m driving electrodes are disposed in the display area and the dummy electrodes are disposed only in the non-display area, and wherein the dummy electrodes are adjacent to the driving electrodes in a peripheral region of the display area to surround four sides of the display area;

wherein the number of the driving electrodes arranged along each of the four sides of the display area is equal to the number of the dummy electrodes that are adjacent to the four sides of the display area;

wherein, when the panel is driven in a touch driving mode, the display driver IC applies the touch scan signal to the m driving electrodes through the m signal lines and to the dummy electrodes through the auxiliary lines, and the touch IC receives touch sensing signals according to the touch scan signal from the m driving electrodes through the m signal lines and from the dummy electrodes through the auxiliary lines; and

wherein each of the dummy electrodes is connected to the display driver IC through a corresponding one of the auxiliary lines.