Display device, driving method, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-10115346-B2
Application number	US-201515306658-A
Country	US
Kind code	B2
Filing date	Feb 10, 2015
Priority date	Apr 28, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A display device according to the disclosure includes: a display section having a plurality of unit pixels; and a driving section that, in a first drive mode, performs write driving and thereafter performs light emission driving in a plurality of light-emitting periods on each of the unit pixels. One of predetermined number of light-emitting periods out of the plurality of light-emitting periods other than a first light-emitting period is longer than the first light-emitting period, and another one of the predetermined number of light-emitting periods is shorter than the first light-emitting period.

First claim

The invention claimed is:

1. A display device comprising:
a display section having a plurality of unit pixels; and
a driving section that, in a first drive mode performed over a plurality of consecutive frame periods indicated by an image signal, performs write driving operations, each of which is performed in one frame period and is followed by an light emission driving operations, and thereafter performs light emission driving operations, each of which is performed within one frame period with no write operation, in a plurality of light-emitting periods on each of the unit pixels, wherein:
one of predetermined number of light-emitting periods out of the plurality of light-emitting periods other than a first light-emitting period is longer than the first light-emitting period, and
another one of the predetermined number of light-emitting periods is shorter than the first light-emitting period.

2. The display device according to claim 1 , wherein time intervals between start timings of adjacent ones of the light-emitting periods are equal to each other.

3. The display device according to claim 1 , wherein, of time intervals between start timings of adjacent ones of the light-emitting periods, one time interval is different from another time interval.

4. The display device according to claim 3 , wherein two non-light-emitting periods sandwiching each of the light-emitting periods have same length.

5. The display device according to claim 1 , wherein the driving section sets, on a basis of the image signal, a one light-emitting period within one frame period indicated by the image signal, and drives each of the unit pixels.

6. The display device according to claim 1 , wherein the driving section sets, on a basis of the image signal, two or more light-emitting periods within one frame period indicated by the image signal, and drives each of the unit pixels.

7. The display device according to claim 1 , wherein the driving section selects one from among a plurality of drive modes including the first drive mode and drives each of the unit pixels in the selected drive mode.

8. The display device according to claim 7 , wherein:
the plurality of drives include a second drive mode, and
in the second drive mode, the driving section performs the write driving operation and thereafter performs the light emission driving operation within one frame period on each of the unit pixels.

9. The display device according to claim 8 , wherein each of the light-emitting periods in the first drive mode is shorter than each of the light-emitting periods in the second drive mode.

10. The display device according to claim 8 , wherein:
the driving section writes a pixel voltage to each of the unit pixels upon the write driving operation, and
a luminance level indicated by the pixel voltage in the first drive mode is higher than a luminance level indicated by the pixel voltage in the second drive mode.

11. The display device according to claim 7 , wherein the driving section selects one from among the plurality of drive modes on a basis of a moving amount in an image to be displayed in the display section.

12. The display device according to claim 7 , wherein the driving section selects one from among the plurality of drive modes on a basis of content of an image to be displayed in the display section.

13. A display device comprising:
a display section having a plurality of unit pixels; and
a driving section that, in a first drive mode performed over a plurality of consecutive frame periods indicated by an image signal, performs write driving operations, each of which is performed in one frame period and is followed by an light emission driving operations, and thereafter performs light emission driving operations, each of which is performed in one frame period with no write operation, in a plurality of light-emitting periods on each of the unit pixels,
wherein, of time intervals between start timings of adjacent ones of the light-emitting periods, one time interval is different from another time interval.

14. The display device according to claim 13 , wherein two non-light-emitting periods sandwiching each of the light-emitting periods have same length.

15. The display device according to claim 13 , wherein one of predetermined number of light-emitting periods out of the plurality of light-emitting periods other than a first light-emitting period is longer than the first light-emitting period.

16. The display device according to claim 13 , wherein, of two adjacent ones of the light-emitting periods, a length of a later light-emitting period is equal to or more than a length of an earlier light-emitting period.

17. The display device according to claim 13 , wherein the first light-emitting period is longer than one of the predetermined number of light-emitting periods.

18. A driving method comprising:
preparing an image signal;
in a first drive mode performed over a plurality of consecutive frame periods indicated by the image signal, performing, based on the image signal, write driving operations, each of which is performed in one frame period and is followed by an light emission driving operations, and thereafter performing light emission driving operations, each of which is performed in one frame period with no write operation, in a plurality of light-emitting periods on each of unit pixels; and,
upon the light emission driving, setting one of predetermined number of light-emitting periods out of the plurality of light-emitting periods other than a first light-emitting period to be longer than the first light-emitting period, and setting another one of the predetermined number of light-emitting periods to be shorter than the first light-emitting period.

19. An electronic apparatus comprising:
a display device; and
a controller that controls operation of the display device,
the display device including
a display section having a plurality of unit pixels, and
a driving section that, in a first drive mode performed over a plurality of consecutive frame periods indicated by the image signal, performs write driving operations, each of which is performed in one frame period and is followed by an light emission driving operations, and thereafter performs light emission driving operations, each of which is performed in one frame period with no write operation, in a plurality of light-emitting periods on each of the unit pixels, wherein:

one of predetermined number of light-emitting periods out of the plurality of light-emitting periods other than a first light-emitting period is longer than the first light-emitting period, and
another one of the predetermined number of light-emitting periods is shorter than the first light-emitting period.

Assignees

• Joled Inc

Inventors

• Maeyama Koichi
• Isobe Teppei

Classifications

• G09G2310/0232

  Special driving of display border areas · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2340/0435

  Change or adaptation of the frame rate of the video stream · CPC title

• G09G3/30

  using electroluminescent panels · CPC title