Display unit, driving method and electronic apparatus

Patent metadata

Field	Value
Publication number	US-9299291-B2
Application number	US-201414541733-A
Country	US
Kind code	B2
Filing date	Nov 14, 2014
Priority date	Dec 27, 2013
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A display unit includes: a display section including a plurality of unit pixels; and a drive section configured to perform a first drive, a second drive, and a third drive on each of the unit pixels in this order, in which each of the first drive and the second drive includes an initialization drive, a writing drive of a pixel voltage, and a light emission drive based on the pixel voltage written by the writing drive, a part of a series of the initialization drive, the writing drive, and the light emission drive differs between the first drive and the second drive, and the third drive includes a light emission drive based on the pixel voltage written by the writing drive in the second drive.

First claim

What is claimed is:

1. A display unit comprising:
a display section including a plurality of unit pixels; and
a drive section configured to perform a first drive, a second drive, and a third drive on each of the unit pixels in this order,
wherein each of the first drive and the second drive includes an initialization drive, a writing drive of a pixel voltage, and a light emission drive based on the pixel voltage written by the writing drive,
a part of a series of the initialization drive, the writing drive, and the light emission drive differs between the first drive and the second drive, and
the third drive includes a light emission drive based on the pixel voltage written by the writing drive in the second drive.

2. The display unit according to claim 1 , wherein a period in which the initialization drive is performed in the second drive is shorter than a period in which the initialization drive is performed in the first drive.

3. The display unit according to claim 1 , wherein the drive section performs the light emission drive immediately after the writing drive in the first drive, and performs the light emission drive after a lapse of a predetermined time after the writing drive in the second drive.

4. The display unit according to claim 1 , wherein
each of the unit pixels includes
a display device,
a first transistor including a drain, a gate, and a source, the source connected to the display device,
a second transistor configured to set a gate voltage of the first transistor by being turned to an ON state, and
a capacitor device inserted between the gate and the source.

5. The display unit according to claim 4 , wherein
the drive section applies a first voltage to the drain of the first transistor while turning the second transistor to the ON state in the initialization drives in the first drive and the second drive, and
the third drive includes, before the light emission drive, a light emission preparation drive in which the first voltage is applied to the drain of the first transistor while turning the second transistor to an OFF state.

6. The display unit according to claim 4 , wherein
the drive section applies a second voltage to the drain of the first transistor while turning the second transistor to an OFF state in the light emission drive in the first drive, and
the drive section applies a third voltage lower than the second voltage to the drain of the first transistor while turning the second transistor to the OFF state in the light emission drives in the second drive and the third drive.

7. The display unit according to claim 1 , wherein
a period in which the light emission drive is performed in the second drive is longer than a period in which the light emission drive is performed in the first drive, and
a luminance level indicated by the pixel voltage in the second drive is lower than a luminance level indicated by the pixel voltage in the first drive.

8. The display unit according to claim 7 , wherein
a period in which the light emission drive is performed in the third drive is longer than the period in which the light emission drive is performed in the first drive, and
a luminance level indicated by the pixel voltage in the third drive is lower than the luminance level indicated by the pixel voltage in the first drive.

9. The display unit according to claim 1 , wherein the drive section performs the light emission drive a plurality of times in each of the second drive and the third drive.

10. The display unit according to claim 1 , further comprising a detection section configured to detect one or more of outside-light illuminance, temperature, and an average luminance level of a display image,
wherein the drive section determines a length of a period in which the light emission drive is performed, based on a detection result in the detection section in the third drive.

11. The display unit according to claim 1 , wherein
the drive section alternately performs a predetermined number of the third drives and a fourth drive after the second drive,
the fourth drive includes an initialization drive, a writing drive of a pixel voltage, and a light emission drive based on the pixel voltage written by the writing drive, and
a part of a series of the initialization drive, the writing drive, and the light emission drive differs between the first drive and the fourth drive.

12. The display unit according to claim 11 , wherein a display region of the display section is partitioned into a plurality of segment regions, and
the drive section determines, based on a motion amount in each of the segment regions, the predetermined number for the unit pixels belonging to the segment region.

13. The display unit according to claim 11 , wherein the drive section partitions, based on a motion amount in an entire display region of the display section, the display region of the display section into a plurality of segment regions, and circularly performs the fourth drive on the plurality of segment regions, the number of the segment regions corresponding to the motion amount.

14. The display unit according to claim 11 , wherein the drive section determines, based on the predetermined number and the pixel voltage, a length of a period in which the light emission drive is performed in the third drive and a length of a period in which the light emission drive is performed in the fourth drive.

15. The display unit according to claim 11 , wherein the drive section gradually decreases the pixel voltage in the fourth drive in every fourth drive or every plurality of fourth drives.

16. The display unit according to claim 11 , wherein the drive section determines the predetermined number for each of the unit pixels, based on contents displayed on the display section.

17. The display unit according to claim 11 , further comprising a gaze detection section configured to detect a user's gaze,
wherein the drive section determines the predetermined number for each of the unit pixels, based on a detection result by the gaze detection section.

18. The display unit according to claim 11 , wherein the drive section changes a position of an image display region in the display section in every fourth drive or every plurality of fourth drives.

19. The display unit according to claim 1 , wherein
the display section includes a plurality of display pixels and a plurality of scanning lines configured to transmit a scanning signal, and
each of the display pixels includes two or more unit pixels connected to scanning lines different from each other of the plurality of unit pixels.

20. The display unit according to claim 19 , wherein the two or more unit pixels include three basic-color pixels emitting light of basic colors different from one another.

21. The display unit according to claim 20 , wherein the drive section decreases a pixel voltage supplied to the basic-color pixel emitting light of a basic color with low visibility of the light of the basic colors in the second drive.

22. The display unit according to claim 20 , wherein the two or more unit pixels further include a non-basic-color pixel emitting color light other than the light of the basic colors.

23. The display unit according to claim 22 , wherein the drive section alternately performs a predetermined number of third drives and a fourth drive after the second drive,
the fourth drive includes an initialization drive, a writing drive of a pixel voltage, and a light emission drive based

Assignees

• Joled Inc

Inventors

• Maeyama Koichi
• Isobe Teppei
• Funatsu Yohei
• Miki Daisuke

Classifications

• G09G2320/103

  Detection of image changes, e.g. determination of an index representative of the image change · CPC title

• G09G2340/06

  Colour space transformation · CPC title

• G09G2320/046

  Dealing with screen burn-in prevention or compensation of the effects thereof · CPC title

• G09G3/3225

  using an active matrix · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title