Display apparatus, drive circuit, driving method and electronic apparatus

• US 9,946,387 B2
• Filed: 01/23/2017
• Issued: 04/17/2018
• Est. Priority Date: 10/12/2011
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Noguchi, Koji, Kida, Yoshitoshi, Azumi, Kohei
• Primary Examiner(s): CERULLO, LILIANA P
• Application Number:
  US15/412,594
• Publication Number:
  US 20170131815A1
• Time in Patent Office: 449 Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/0202 Addressing of scan or signal lines
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12

Abstract

A display apparatus includes: a display device; a touch detection device; and a driver unit driving the display device so as to sequentially display M horizontal lines in each of plural unit drive periods forming one frame period and driving the touch detection device in N touch detection periods provided in each unit drive period, in which N is lower than M.

Claims

1. A display device comprising:

scanning signal lines extending in a line direction and being arranged in a column direction which intersects the line direction;

pixel signal lines extending in the column direction and being arranged in the line direction;

switch elements, each of the switch elements being electrically coupled to one of the gate lines and one of the signal lines;

pixel electrodes arranged in a row-column configuration, each of the pixel electrodes being electrically coupled to one of the switch elements;

drive electrodes overlapping the pixel electrodes;

a driver unit configured to cause the scanning signal lines, the pixel signal lines, and the drive electrodes to display images and to detect a touch; and

a control unit configured to cause the driver unit to;

divide a frame in which a image is displayed by all of the pixel electrodes into a plurality of display periods; and

determine a touch period between the display periods in the frame, the touch detection period being a period in which the drive electrode are driven to detect a touch,

wherein the driver unit is configured to;

during the display period, apply a DC drive signal to all the drive electrodes, apply a scanning signal to the scanning signal line sequentially to activate the switch elements of a target of the display operation, and apply pixel signals to the pixel signal lines to supply the pixel signals to the pixel electrode through the switch elements respectively,

during the touch period, apply an AC driving signal to the drive electrode to be a target of the touch detection operation and not apply the scanning signal to all scanning signal lines to inactivate all the switch elements.

2. The display device according to claim 1,

wherein during the touch period, apply an AC driving signal to the drive electrode to be a target of the touch detection operation, apply a DC drive signal to the rest of the drive electrodes, and not apply the scanning signal to all scanning signal lines to inactivate all the switch elements.

3. The display device according to claim 1 wherein the AC drive signal has at least one pulse.

4. The display device according to claim 3,

wherein a number of the pulse during the touch detection period is less than a number of the gate signal during the display period next to the touch detection period.

5. The display device according to claim 3,

wherein a number of the pulse during the touch detection period is equal to a number of the gate signal during the display period next to the touch detection period.

6. The display device according to claim 3,

wherein a number of the pulse during the touch detection period is more than a number of the gate signal during the display period next to the touch detection period.

7. The display device according to claim 1, further comprising

a liquid crystal layer,

wherein the pixel electrodes are formed between the liquid crystal layer and the drive electrodes.

8. The display device according to claim 7, further comprising

touch detection electrodes above the drive electrodes,

capacitances are formed between the touch detection electrodes and the drive electrodes respectively.

9. The display device according to claim 8,

wherein the drive electrodes lengthen in one direction of the column direction and the line direction, the touch detection electrode lengthen in other direction.

10. The display device according to claim 1, further comprising

a liquid crystal layer,

wherein the pixel electrodes are arranged opposite to the drive electrodes so as to sandwich the liquid crystal layer.

11. The display device according to claim 10, further comprising touch detection electrodes above the drive electrodes,

capacitances are formed between the touch detection electrodes and the drive electrodes respectively.

12. The display device according to claim 11,

wherein the drive electrodes lengthen in one direction of the column direction and the line direction, the touch detection electrode lengthen in other direction.