Display apparatus, drive circuit, driving method and electronic apparatus with touch detection periods, sequential display and AC signal modifications

• US 9,141,222 B2
• Filed: 10/04/2012
• Issued: 09/22/2015
• 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:
  US13/645,179
• Publication Number:
  US 20130093722A1
• Time in Patent Office: 1,083 Days
• Field of Search: 345173-178, 178 1801- 1904
• US Class Current: 1/1
• 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 apparatus comprising:

a plurality of display devices configured to display images, wherein the plurality of display devices are pixels forming one display screen, the display devices having pixel electrodes;

a plurality of drive electrodes facing the pixel electrodes; and

a control unit connected to each display device and each drive electrode,

wherein the control unit drives the display devices and the drive electrodes to display the images and to make a touch detection;

each of a temporally continued plurality of frames includes plural unit drive periods, each unit drive period includes at least one touch detection period and at least two display periods, and the at least one touch detection period and the at least two display periods do not temporally overlap one another;

the control unit applies an AC drive signal to the drive electrode to be a target of the touch detection operation to make the touch detection in the touch detection period;

the control unit applies a DC drive signal to all of the drive electrodes and applies a pixel signal to the pixel electrode to be a target of the display operation to display the images in the display periods; and

N<

M, where the number of the touch detection periods in each unit drive period is N, and the number of the display periods in each unit drive period is M.

2. The display apparatus according to claim 1,

wherein the control unit drives the drive electrode before displaying each of N horizontal lines in M horizontal lines in each unit drive period.

3. The display apparatus according to claim 1,

further comprising touch detection electrodes,

wherein capacitance is formed between the touch detection electrodes and the drive electrodes, and the control unit applies the AC drive signal which makes a transition once or more in each touch detection period to the drive electrodes.

4. The display apparatus according to claim 3,

wherein the AC drive signal has one or plural pulses.

5. The display apparatus according to claim 4,

wherein a pulse width of the AC drive signal in one touch detection period is different from a pulse width of the AC drive signal in another touch detection period.

6. The display apparatus according to claim 4,

wherein a pulse position of the AC drive signal in one touch detection period is different from a pulse position of the AC drive signal in another touch detection period.

7. The display apparatus according to claim 3, further comprising:

a detection unit sampling a detection signal outputted from the touch detection electrodes at timings before and after respective transitions of the AC drive signal to detect a touch based on variations in sampling results in respective transitions.

8. The display apparatus according to claim 3,

wherein the control unit applies the AC drive signal in units of a given number of respective drive electrodes.

9. The display apparatus according to claim 8,

wherein the control unit applies the AC drive signal to the same drive electrodes over a given number of unit drive periods.

10. The display apparatus according to claim 3,

further comprising a liquid crystal layer,

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

11. The display apparatus according to claim 10,

wherein the control unit applies a display drive signal to the drive electrodes in periods other than the touch detection period.

12. The display apparatus according to claim 3,

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.

13. The display apparatus according to claim 1,

wherein the “

N”

is 1.

14. The display apparatus according to claim 1,

wherein a turn in which one horizontal line is display-driven in the unit drive period to which one horizontal line belongs in one frame period is different from a turn in which one horizontal line is display-driven in the unit drive period to which one horizontal line belongs in another frame period.

15. The display apparatus according to claim 1,

further comprising a plurality of touch detection electrodes facing the drive electrodes,

wherein the AC driving signal applied to the drive electrodes is transmitted to the touch detection electrodes through capacitance,

the touch detection electrodes output the touch detection signal based on the AC driving signal to make the touch detection based on the touch detection signal.

16. The display apparatus according to claim 15,

wherein in the touch detection period, the control unit applying the DC drive signal to the drive electrodes that are other than the target of the touch detection operation.

17. The display apparatus according to claim 16,

wherein the drive electrodes are strip-shaped, and

the touch detection electrodes are strip-shaped and extending in a direction crossing the direction that the drive electrodes extend.

18. A control unit for driving a plurality of display devices, which are pixels forming one display screen, the control unit comprising:

a control circuit connected to each display device and a plurality of drive electrodes, and configured to drive the display devices and the drive electrodes to display images and to make a touch detection, wherein each of a temporally-continued plurality of frames includes plural unit drive periods, each unit drive period includes at least one touch detection period and at least two display periods, and the at least one touch detection period and the at least two display periods do not temporally overlap one another, the control unit applies an AC drive signal to the drive electrode to be a target of the touch detection operation to make the touch detection in the touch detection period, and the control unit applies a DC drive signal to all of the drive electrodes and applies a pixel signal to the pixel electrode to be a target of the display operation to display the images in the display periods, and N<

M, where the number of the touch detection periods in each unit drive period is N, and the number of the display periods in each unit drive period is M.

19. A method for operating a display apparatus, the display apparatus including a plurality of display devices configured to display images, wherein the plurality of display devices are pixels forming one display screen, the display devices having pixel electrodes, a plurality of drive electrodes facing the pixel electrodes, and a control unit connected to each display device and each drive electrode wherein the control unit drives the display devices and the drive electrodes to display the images and to make a touch detection, wherein each of a temporally-continued plurality of frames includes plural unit drive periods, each unit drive period includes at least one touch detection period and at least two display periods, and the at least one touch detection period and the at least two display periods do not temporally overlap one another, the control unit applies an AC drive signal to the drive electrode to be a target of the touch detection operation to make the touch detection in the touch detection period, the control unit applies a DC drive signal to all of the drive electrodes and applies a pixel signal to the pixel electrode to be a target of the display operation to display the images in the display periods, and N<

M, where the number of the touch detection periods in each unit drive period is N, and the number of the display periods in each unit drive period is M, the method comprising;

driving the display devices with the control unit so that the display devices display the images in the display periods; and

driving the touch detection device with the control unit so that the touch detection device makes the touch detection in the touch detection period.

20. An electronic apparatus comprising:

a display apparatus; and

a control unit performing operation control using the display apparatus,

the display apparatus including a plurality of display devices configured to display images, wherein the plurality of display devices are pixels forming one display screen, the display devices having pixel electrodes, the display apparatus further including a plurality of drive electrodes facing the pixel electrodes,

wherein the control unit drives the display devices and the drive electrodes to display the images and to make a touch detection, each of a temporally continued plurality of frames includes plural unit drive periods, each unit drive period includes at least one touch detection period and at least two display periods, and the at least one touch detection period and the at least two display periods do not temporally overlap one another, the control unit applies an AC drive signal to the drive electrode to be a target of the touch detection operation to make the touch detection in the touch detection period, the control unit applies a DC drive signal to all of the drive electrodes and applies a pixel signal to the pixel electrode to be a target of the display operation to display the images in the display periods, and N<

M, where the number of the touch detection periods in each unit drive period is N, and the number of the display periods in each of the plurality of unit drive periods is M.