DISPLAY DEVICE WITH INTEGRATED TOUCH SCREEN

• US 20130147724A1
• Filed: 04/19/2012
• Published: 06/13/2013
• Est. Priority Date: 12/09/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: Buyeol Lee, Sangsoo Hwang, Taehwan Kim, Youngjoon Lee
• Inventors: HWANG, SangSoo, Lee, BuYeol, Kim, TaeHwan, Lee, YoungJoon, Seo, SeongMo
• Granted Patent: US 8,994,673 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A display device with an integrated touch screen according to an embodiment, includes a display panel including a touch screen provided in an active area of the display panel, and a display driver circuit provided in an inactive area of the display panel, the touch screen including a plurality of driving electrodes, each of the driving electrodes including a plurality of sub driving electrodes positioned in the active area of the display panel but electrically connected to each other in the inactive area of the display panel, the touch screen further including a plurality of sensing electrodes disposed between the sub driving electrodes and formed in the active area of the panel, and the display driver circuit configured to apply a common voltage to the driving electrodes and the sensing electrodes or a touch driving voltage to the driving electrodes according to a driving mode of the display panel.

Claims

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

a display panel including a touch screen provided in an active area of the display panel, and a display driver circuit provided in an inactive area of the display panel,

the touch screen including a plurality of driving electrodes, each of the driving electrodes including a plurality of sub driving electrodes positioned in the active area of the display panel but electrically connected to each other in the inactive area of the display panel,

the touch screen further including a plurality of sensing electrodes disposed between the sub driving electrodes and formed in the active area of the panel, and

the display driver circuit configured to apply a common voltage to the driving electrodes and the sensing electrodes or a touch driving voltage to the driving electrodes according to a driving mode of the display panel.

2. The display device of claim 1, further comprising:

a touch circuit configured to generate the touch driving voltage and apply the generated touch driving voltage to the display driver circuit, and to receive a touch sensing signal from the display driver circuit to detect a touch input to the touch screen.

3. The display device of claim 1, wherein the plurality of sub driving electrodes are electrically connected to each other inside the display driver circuit provided in the inactive area of the display panel.

4. The display device of claim 1, wherein the plurality of sub driving electrodes are electrically connected to each other outside the display driver circuit provided in the inactive area of the display panel.

5. The display device of claim 1, wherein the driving electrodes include:

a first driving electrode having a group of first sub driving electrodes extending in a first direction, each of the first sub driving electrodes electrically connected to a first connection line, and

a second driving electrode having a group of second sub driving electrodes extending in the first direction, each of the second sub driving electrodes electrically connected to a second connection line,

wherein all the first connection lines are connected to each other in the inactive display area excluding the active area, and all the second connection lines are connected to each other in the inactive area excluding the active area.

6. The display device of claim 5, wherein the display driver circuit further includes:

a synchronization signal generator configured to generate a synchronization signal, and

a plurality of switches corresponding respectively to the first and second connection lines, and simultaneously operating according to the synchronization signal.

7. The display device of claim 5, wherein the first and second connection lines extend to a portion of the display panel where the display driver circuit is disposed.

8. The display device of claim 5, wherein only one first connection line is electrically connected to each of the first sub driving electrodes, and

only one second connection line is electrically connected to each of the second sub-driving electrodes.

9. The display device of claim 8, wherein the first sub driving electrodes respectively correspond with the second sub driving electrodes, and

for each of the second sub driving electrodes, the first connection line originating from the corresponding first sub driving electrode passes through under the corresponding second sub driving electrode without contacting the corresponding second sub driving electrode.

10. The display device of claim 5, wherein each of the first sub driving electrodes is electrically connected to one first connection line through a first contact hole, and

each of the second sub driving electrodes is electrically connected to one second connection line through a second contact hole.

11. The display device of claim 5, wherein the sensing electrodes include:

a first sensing electrode extending in a second direction between two neighboring first sub driving electrodes among the group of first sub driving electrodes, and between two neighboring second sub driving electrodes among the group of second sub driving electrodes, and

a second sensing electrode extending in the second direction between two neighboring first sub driving electrodes among the group of first sub driving electrodes, and between two neighboring second sub driving electrodes among the group of second sub driving electrodes,

wherein the first and second sensing electrodes are substantially parallel to each other.

12. The display device of claim 11, wherein the first and second directions are substantially perpendicular to each other.

13. The display device of claim 1, wherein the display driver circuit includes a common voltage generator configured to generate the common voltage.

14. The display device of claim 13, wherein the display driver circuit further includes:

a synchronization signal generator configured to generate a first synchronization signal when the driving mode of the display panel is in a display mode, and to generate a second synchronization signal when the driving mode of the display panel is in a touch mode, and

a switching unit configured to apply the generated common voltage to the driving electrodes and the sensing electrodes when the first synchronization signal is received from the synchronization signal generator, and to apply the touch driving voltage to the driving electrodes when the second synchronization signal is received from the synchronization signal generator.

15. The display device of claim 1, wherein the plurality of sub driving electrodes are a plurality of block type common electrodes which are formed to respectively overlap with a plurality of unit pixel areas, and

each of the sensing electrodes is a block type common electrode which is formed to overlap with the plurality of unit pixel areas.

16. The display device of claim 1, wherein the plurality of sub driving electrodes are a plurality of block type common electrodes which are formed to respectively overlap with a plurality of unit pixel areas, and

each of the sensing electrodes is a block type common electrode which is formed to overlap with the plurality of unit pixel areas.

17. The display device of claim 1, wherein when the driving mode of the display panel is in a display mode, the display driver circuit applies the common voltage to the driving electrodes and the sensing electrodes functioning as a common electrode for displaying images.

18. The display device of claim 1, wherein when the driving mode of the display panel is in a touch mode, the display driver circuit applies the touch driving voltage to the driving electrodes for detecting a touch input to the touch screen.