TOUCH PANEL AND TOUCH PANEL INTEGRATED DISPLAY DEVICE

• US 20150242041A1
• Filed: 09/13/2013
• Published: 08/27/2015
• Est. Priority Date: 09/14/2012
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Sugita, Yasuhiro, Kida, Kazutoshi
• Granted Patent: US 9,690,418 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

An electrostatic capacitive touch panel having a large surface area includes (i) a driving electrode group (220) and a sensing electrode group (130) which are provided on a substrate (210), and (ii) a touch panel driving circuit (250) provided in a frame region adjacent to a touch panel region where the driving electrode group (220) and the sensing electrode group (130) are provided. The touch panel driving circuit (250) is made up of TFTs made of an oxide semiconductor having a wide band gap so that the touch panel driving circuit (250) has a small surface area. This allows the touch panel to have a narrow frame.

Claims

1. A touch panel comprising:

a substrate;

sensing electrodes and driving electrodes, each for detection of a touched position, provided on an identical surface or different surfaces of the substrate;

a touch panel driving circuit which drives the driving electrodes; and

a touched position detecting circuit which detects the touched position upon receipt of a detection output from the sensing electrodes,

the touch panel driving circuit being made up of TFTs made of an oxide semiconductor.

2. The touch panel as set forth in claim 1, wherein the touch panel driving circuit is provided in a frame region adjacent to a touch electrode region in which the sensing electrodes and the driving electrodes are provided.

3. The touch panel as set forth in claim 1, wherein the oxide semiconductor of which the touch panel driving circuit is made is an InGaZnO-based oxide semiconductor.

4. The touch panel as set forth in claim 2, wherein the sensing electrodes, the driving electrodes, and the touch panel driving circuit are provided on the identical surface of the substrate.

5. The touch panel as set forth in claim 1, wherein a color filter is provided on the substrate, the color filter being incorporated in a display device to allow the display device to carry out multicolor display.

6. The touch panel as set forth in claim 1, wherein the touch panel driving circuit is a sequential driving circuit which sequentially drives the driving electrodes.

7. The touch panel as set forth in claim 1, wherein the touch panel driving circuit is a parallel driving circuit which drives the driving electrodes in parallel.

8. The touch panel as set forth in claim 6, wherein the touch panel driving circuit carries out time-sharing driving in synchronization with a vertical synchronization signal of a display device to be integrated with the touch panel, the touch panel driving circuit driving the touch panel during a pause period of the vertical synchronization signal.

9. The touch panel as set forth in claim 6, wherein the touch panel driving circuit carries out time-sharing driving in synchronization with a horizontal synchronization signal of a display device to be integrated with the touch panel, the touch panel driving circuit driving the touch panel during a period other than an initial charging period during which a source line of each of sub pixels of the display device is charged.

10. The touch panel as set forth in claim 6, wherein the touch panel driving circuit carries out time-sharing driving in synchronization with a horizontal synchronization signal of a display device to be integrated with the touch panel, the touch panel driving circuit driving the touch panel during a period overlapping with an initial charging period during which (i) a source line of each of sub pixels of the display device is charged and (ii) radiant noise is present.

11. A touch panel integrated display device comprising:

the touch panel recited in claim 4,

the sensing electrodes, the driving electrodes, and the touch panel driving circuit, each for detection of the touched position, being provided on a surface of the substrate which surface is on a viewer side.

12. A touch panel integrated display device comprising:

the touch panel recited in claim 4,

the sensing electrodes, the driving electrodes, and the touch panel driving circuit, each for detection of the touched position, being provided on a surface of the substrate which surface is on a side opposite to a viewer side.

13. A touch panel integrated display device comprising:

the touch panel recited in claim 1,

the substrate being provided with (i) a color filter which allows the touch panel integrated display device to carry out multicolor display and (ii) a counter common electrode used to drive pixels of the touch panel integrated display device,

the touch panel driving circuit being provided on a TFT substrate of the touch panel integrated display device on which TFT substrate pixel driving electrodes are provided.

14. The touch panel integrated display device as set forth in claim 11, wherein the touch panel driving circuit is a sequential driving circuit which sequentially drives the driving electrodes.

15. The touch panel integrated display device as set forth in claim 11, wherein the touch panel driving circuit is a parallel driving circuit which drives the driving electrodes in parallel.

16. The touch panel integrated display device as set forth in claim 14, wherein the touch panel driving circuit carries out time-sharing driving in synchronization with a vertical synchronization signal of the touch panel integrated display device, the touch panel driving circuit driving the touch panel during a pause period of the vertical synchronization signal.

17. The touch panel integrated display device as set forth in claim 14, wherein the touch panel driving circuit carries out time-sharing driving in synchronization with a horizontal synchronization signal of the touch panel integrated display device, the touch panel driving circuit driving the touch panel during a period other than an initial charging period during which a source line of each of sub pixels of the touch panel integrated display device is charged.

18. The touch panel integrated display device as set forth in claim 14, wherein the touch panel driving circuit carries out time-sharing driving in synchronization with a horizontal synchronization signal of the touch panel integrated display device, the touch panel driving circuit driving the touch panel during a period overlapping with an initial charging period during which (i) a source line of each of sub pixels of the touch panel integrated display device is charged and (ii) radiant noise is present.

19. The touch panel integrated display device as set forth in claim 11, wherein the touch panel integrated display device is a liquid crystal display device.

20. The touch panel integrated display device as set forth in claim 11, wherein the touch panel integrated display device is an EL display device.