DISPLAY APPARATUS, DRIVE CIRCUIT, DRIVING METHOD AND ELECTRONIC APPARATUS

• US 20130093722A1
• Filed: 10/04/2012
• Published: 04/18/2013
• Est. Priority Date: 10/12/2011
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Noguchi, Koji, Kida, Yoshitoshi, Azumi, Kohei
• Granted Patent: US 9,141,222 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 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.

2. The display apparatus according to claim 1,

wherein the driver unit drives the touch detection device before displaying each of N horizontal lines in M horizontal lines in each unit drive period.

3. The display apparatus according to claim 1,

wherein the touch detection device has

drive electrodes, and

touch detection electrodes forming capacitance between the touch detection electrodes and the drive electrodes, and

the driver unit applies an 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 1,

wherein the “

N”

is 1.

9. 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.

10. The display apparatus according to claim 3,

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

11. The display apparatus according to claim 10,

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

12. The display apparatus according to claim 3,

wherein the display device includes

a liquid crystal layer, and

pixel electrodes 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.

13. The display apparatus according to claim 3,

wherein the display device includes

a liquid crystal layer, and

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

14. The display apparatus according to claim 12,

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

15. A drive circuit comprising:

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

16. A driving method comprising:

driving a display device so as to sequentially display M horizontal lines in each of plural unit drive periods forming one frame; and

driving a touch detection device in N touch detection periods provided in each unit drive period, in which N is lower than M.

17. An electronic apparatus comprising:

a display apparatus, and

a control unit performing operation control using the display apparatus,

wherein the display apparatus has

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.