Display panel with touch detection function, drive circuit, and electronic unit

• US 10,540,031 B2
• Filed: 07/02/2018
• Issued: 01/21/2020
• Est. Priority Date: 04/13/2011
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Kida, Yoshitoshi, Noguchi, Koji, Mizuhashi, Hiroshi, Azumi, Kohei
• Primary Examiner(s): Boyd, Jonathan A
• Application Number:
  US16/025,368
• Publication Number:
  US 20180307360A1
• Time in Patent Office: 568 Days
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2217/96031 Combination of touch switch and LC display

Abstract

There are provided a display panel with a touch detection function, a drive circuit, and an electronic unit, which make it possible to realize many functions related to touch detection. The display panel includes: one or more display elements; one or more drive electrodes extending in one direction; an electrode drive section integrated into a chip, and applying a drive signal to the drive electrodes; and one or more touch detection electrodes extending in a direction intersecting the direction in which the drive electrodes extend.

Claims

1. A display panel with a touch detection function, the display panel comprising:

a TFT substrate;

a plurality of common electrodes on the TFT substrate;

an insulating layer on the common electrodes;

a plurality of pixel electrodes on the insulating layer;

a plurality of pixel signal lines each of which is coupled with the pixel electrodes;

a gate driver configured to drive gate electrodes of transistors for selecting the pixel electrodes;

a drive section including a drive electrode driver for a touch detection, a display drive section to supply a pixel signal to the pixel signal lines, and a power control section to control power supply to the drive electrode driver and the display drive section on the TFT substrate; and

a plurality of wires connecting the drive section to the common electrodes on the TFT substrate,

wherein

the drive section is configured to apply an AC drive signal for the touch detection to the common electrodes via the wires in a touch detection operation,

the common electrodes are connected via the wires to a chip on the TFT substrate, the chip being the drive section and in which the drive electrode driver, the display drive section, and the power control section are integrated,

the gate driver and the drive section are located on the TFT substrate along a periphery of a display area, and

the wires are located on the TFT substrate in a region between the gate driver and the display area, along the periphery of the display area.

2. The display panel according to claim 1, wherein the drive electrode driver applies the AC drive signal for the touch detection to the common electrodes, based on a display synchronization signal supplied from the display drive section.

3. The display panel according to claim 2, further comprising

a touch-detection control section controlling touch detection operation,

wherein the touch-detection control section generates a touch-detection synchronization signal based on the display synchronization signal, and

the drive electrode driver applies the AC drive signal for the touch detection to the common electrodes, based on the touch-detection synchronization signal.

4. The display panel according to claim 3, wherein the touch-detection control section is integrated together with the drive section.

5. The display panel according to claim 1, further comprising one or more touch detection electrodes intersecting with the one or more common electrodes,

wherein

a capacitance is formed between each of the common electrodes and each of the touch detection electrodes, and

a detection signal according to the AC drive signal applied to the common electrodes is outputted from the touch detection electrode.

6. The display panel according to claim 1, wherein the drive electrode driver performs scanning by sequentially selecting one or more electrodes to be driven out of the common electrodes, and applies the AC drive signal for the touch detection to the electrode to be driven.

7. The display panel according to claim 6, wherein the drive electrode driver has a plurality of scanning modes whose methods of sequentially selecting the electrode to be driven are different from each other.

8. A display panel with a touch detection function, the display panel comprising:

a TFT substrate;

a plurality of common electrodes on the TFT substrate;

a plurality of pixel electrodes on the common electrodes with an insulating layer therebetween;

a drive section including a drive electrode driver, a display control section, a power control section, and a display drive section driving the pixel electrodes;

a plurality of pixel signal lines each of which is coupled with the pixel electrodes;

a gate driver configured to drive gate electrodes of transistors for selecting the pixel electrodes on the TFT substrate; and

a plurality of wires connecting the drive section to the common electrodes on the TFT substrate,

wherein

the drive electrode driver is configured to apply an AC drive signal for the touch detection to the one or more common electrodes in a touch detection operation,

the display drive section is configured to generate a pixel signal based on a control pixel signal and a source drive control signal from the display control section, and to supply the pixel signal to the pixel signal line,

the power control section controls power supply to the drive electrode driver and the display drive section,

the common electrodes are connected via the wires to a chip on the TFT substrate, the chip being the drive section and in which the drive electrode driver, the display control section, the power control section, and the display drive section are integrated,

the gate driver and the drive section are located on the TFT substrate along a periphery of a display area,

the wires extend from the drive section in the periphery of the display area to the display area, and

the wires are located on the TFT substrate in a region between the gate driver and the display area, along the periphery of the display area.

9. The display panel according to claim 8, wherein the drive electrode driver applies the AC drive signal for the touch detection to the common electrodes, based on a display synchronization signal supplied from the display drive section.

10. The display panel according to claim 9, further comprising

a touch-detection control section controlling touch detection operation,

wherein the touch-detection control section generates a touch-detection synchronization signal based on the display synchronization signal, and

the drive electrode driver applies the AC drive signal for the touch detection to the common electrodes, based on the touch-detection synchronization signal.

11. The display panel according to claim 10, wherein the touch-detection control section is integrated together with the drive section.

12. The display panel according to claim 8, further comprising one or more touch detection electrodes intersecting with the one or more common electrodes,

wherein

a capacitance is formed between each of the common electrodes and each of the touch detection electrodes, and

a detection signal according to the AC drive signal applied to the common electrodes is outputted from the touch detection electrode.

13. The display panel according to claim 8, wherein the drive electrode driver performs scanning by sequentially selecting one or more electrodes to be driven out of the common electrodes, and applies the AC drive signal for the touch detection to the electrode to be driven.

14. The display panel according to claim 13, wherein the drive electrode driver has a plurality of scanning modes whose methods of sequentially selecting the electrode to be driven are different from each other.