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

• US 9,851,824 B2
• Filed: 03/15/2012
• Issued: 12/26/2017
• 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
• Application Number:
  US13/420,669
• Publication Number:
  US 20120262389A1
• Time in Patent Office: 2,112 Days
• Field of Search: 345174
• 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:

one or more display elements;

one or more common electrodes;

a drive section in which a drive electrode driver, a display control section, and a display drive section are integrated into a chip;

one or more touch detection electrodes intersecting with the one or more common electrodes;

one or more pixel signal lines each of which is coupled with the one or more display elements; and

at least one gate driver configured to drive gate electrodes of transistors for selecting the display elements,

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 gate driver and the drive section are located directly on a TFT substrate along a first periphery and a second periphery of a display area, respectively, the first periphery being orthogonal to the second periphery, the display area including the one or more display elements,

the drive electrode driver is connected to the one or more common electrodes via wires arranged only on the TFT substrate, and

the wires include wire portions that extend along the first periphery of the display area and are located in a region between the gate driver and 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, 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. The display panel according to claim 1, further comprising

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

wherein the power control section is integrated into the drive section together with the drive electrode driver.

9. A drive circuit comprising:

a drive section in which a drive electrode driver, a display control section, and a display drive section driving one or more display elements are integrated into a chip, the drive electrode driver being configured to apply an AC drive signal for the touch detection to one or more common electrodes that intersect with one or more touch detection electrodes; and

at least one gate driver configured to drive gate electrodes of transistors for selecting the display elements,

wherein

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 a pixel signal line that is coupled with the one or more display elements,

the gate driver and the drive section are located directly on a TFT substrate along a first periphery and a second periphery of a display area, respectively, the first periphery being orthogonal to the second periphery, the display area including the one or more display elements,

the drive electrode driver is connected to the one or more common electrodes via wires arranged only on the TFT substrate, and

the wires include wire portions that extend along the first periphery of the display area and are located in a region between the gate driver and the display area.

10. An electronic unit including a display panel with a touch detection function and a control section performing operation control using the display panel, the display panel comprising:

one or more display elements;

one or more common electrodes;

a drive section in which a drive electrode driver, a display control section, and a display drive section driving the display elements are integrated into a chip;

one or more touch detection electrodes intersecting with the one or more common electrodes;

one or more pixel signal lines each of which is coupled with the one or more display elements;

and

at least one gate driver configured to drive gate electrodes of transistors for selecting the display elements,

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 gate driver and the drive section are located directly on a TFT substrate along a first periphery and a second periphery of a display area, respectively, the first periphery being orthogonal to the second periphery, the display area including the one or more display elements,

the drive electrode driver is connected to the one or more common electrodes via wires arranged only on the TFT substrate, and

the wires include wire portions that extend along the first periphery of the display area and are located in a region between the gate driver and the display area.

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

one or more display elements;

one or more common electrodes;

a drive section in which a drive electrode driver, a display control section, and a display drive section driving the display elements are integrated into a chip;

one or more pixel signal lines each of which is coupled with the one or more display elements; and

at least one gate driver configured to drive gate electrodes of transistors for selecting the display elements,

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 gate driver and the drive section are located directly on a TFT substrate along a first periphery and a second periphery of a display area, respectively, the first periphery being orthogonal to the second periphery, the display area including the one or more display elements,

the drive electrode driver is connected to the one or more common electrodes via wires arranged only on the TFT substrate, and

the wires include wire portions that extend along the first periphery of the display area and are located in a region between the gate driver and the display area.

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

one or more display elements that are included in a display area having a first periphery and a second periphery, the first periphery being orthogonal to the second periphery;

one or more common electrodes;

a drive section in which a drive electrode driver, a display control section, and a display drive section driving the display elements are integrated into a chip;

one or more touch detection electrodes intersecting with the one or more common electrodes;

one or more pixel signal lines each of which is coupled with the one or more display elements; and

at least one gate driver configured to drive gate electrodes of transistors for selecting the display elements,

a display drive section driving the display elements,

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

the drive electrode driver is connected to the one or more common electrodes via wires arranged only on the TFT substrate, and

the wires include wire portions that extend along the first periphery of the display area and are located in a region between the gate driver and the display area.