Display device, display method, and electronic device

• US 9,495,922 B2
• Filed: 02/21/2013
• Issued: 11/15/2016
• Est. Priority Date: 03/15/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Hirabayashi, Yukiya, Shimizu, Koji, Ozawa, Yutaka
• Primary Examiner(s): Boyd, Jonathan
• Assistant Examiner(s): Azongha, Sardis F
• Application Number:
  US13/772,495
• Publication Number:
  US 20130241814A1
• Time in Patent Office: 1,363 Days
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

Disclosed herein is a display device including: a display section configured to have a plurality of scanning signal lines to which respective scanning signals are applied, the display section performing line-sequential scanning by repeating interruption and resumption of the line-sequential scanning on a basis of the plurality of scanning signals, and displaying an image; and a scanning section configured to generate the plurality of scanning signals such that transition times on a pulse termination side of the respective scanning signals are equal to each other.

Claims

1. A display device comprising:

a display section configured to have a plurality of scanning signal lines to which respective scanning signals are applied and to display an image on a basis of the scanning signals;

a sensor section configured to perform touch detection according to a touch detection period; and

a scanning section configured to generate the plurality of scanning signals, the scanning section having a shift register,

wherein the shift register has first transfer blocks and second transfer blocks, the first transfer blocks and the second transfer blocks being connected alternately in a scanning direction, the shift register being configured to perform a transfer operation according to a transfer signal that is synchronized with a clock signal;

each of the first transfer blocks has first transfer circuits in stages,

the second transfer blocks each have one or more second transfer circuits respectively in one or more stages, and

the second transfer blocks are respectively configured to delay the transfer signal from a preceding first transfer block to a next first transfer block in synchronism with a first pulse of the clock signal following an end of the touch detection period.

2. The display device according to claim 1, wherein the delay causes the display section to interrupt line-sequential scanning.

3. The display device according to claim 2,

wherein the display section performs the line-sequential scanning in each frame, and

a transfer operation in one frame and a transfer operation in another frame are delayed in respective different second transfer blocks.

4. The display device according to claim 1,

wherein the delay is performed by at least one of the second transfer circuits of a corresponding second transfer block.

5. The display device according to claim 1,

wherein the second transfer circuits have a same circuit configuration as the first transfer circuits.

6. An electronic device comprising:

a display device according to claim 5; and

a control section configured to perform operation control using the display device.

7. The display device according to claim 1,

wherein the second transfer blocks each have one second transfer circuit.

8. The display device according to claim 1, further comprising:

a control section configured to provide the delay by lengthening at least one of a clock pulse width and a clock pulse interval of the transfer signal.

9. The display device according to claim 1,

wherein

a clock pulse width and a clock pulse interval of the transfer signal are fixed.

10. The display device according to claim 1,

wherein

the scanning section has a load circuit connected to each of the second transfer circuits.

11. The display device according to claim 1,

wherein the scanning section further includes a first buffer circuit for generating the scanning signals on a basis of an output signal of each of the first transfer circuits.

12. The display device according to claim 11,

wherein

the scanning section further includes a second buffer circuit supplied with an output signal of each of the second transfer circuits.

13. The display device according to claim 1,

wherein the shift register is formed using transistors of a single conductivity type.

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

a touch panel,

wherein the touch panel detects an external adjacent object in a period of interruption of line-sequential scanning in the display section.

15. A display device comprising:

a display section configured to have a plurality of scanning signal lines to which respective scanning signals are applied and to display an image; and

a scanning section configured to generate the scanning signals,

wherein the scanning section includes

a shift register for performing transfer operation on a basis of a transfer clock, and

a control section configured to control the shift register by the transfer clock, allowing the scanning section to interrupt and resume generating the scanning signals, and

the control section is configured to be able to change amplitude of the transfer clock at least at a timing of a first transfer clock that is resumed after being interrupted.

16. The display device according to claim 15,

wherein the control section lengthens at least one of a clock pulse width and a clock pulse interval of the transfer clock, whereby the display section interrupts line-sequential scanning.

17. The display device according to claim 15,

wherein after lengthening clock pulse width of one or a plurality of clock pulses of the transfer clock, the control section returns the clock pulse width of the transfer clock to an original clock pulse width and increases amplitude of the transfer clock.

18. An electronic device comprising:

a display device according to claim 15; and

a control section configured to perform operation control using the display device.

19. A display method comprising:

generating a plurality of scanning signals by a scanning section, and applying the plurality of scanning signals to a plurality of scanning signal lines;

performing line-sequential scanning by a display section to display an image on a basis of the plurality of scanning signals;

performing, by a sensor section, touch detection according to a touch detection period,

wherein the scanning section has a shift resister, the shift register has first transfer blocks and second transfer blocks, the first transfer blocks and the second transfer blocks being connected alternately in a scanning direction, each of the first transfer blocks has first transfer circuits in stages, and the second transfer blocks each have one or more second transfer circuits respectively in one or more stages;

transferring, by the shift register, an input signal according to a transfer signal that is synchronized with a clock signal; and

delaying, by respective ones of the second transfer blocks, the transfer signal from a preceding first transfer block to a next first transfer block in synchronism with a first pulse of the clock signal following an end of the touch detection period.