Light emitting period setting method, driving method for display panel, driving method for backlight, light emitting period setting apparatus, semiconductor device, display panel and electronic apparatus

Patent metadata

Field	Value
Publication number	US-9626911-B2
Application number	US-201615355633-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	Feb 8, 2008
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

Disclosed herein is a light emitting period setting method for a display panel wherein the peak luminance level is varied through control of a total light emitting period length which is the sum total of period lengths of light emitting periods arranged in a one-field period, including a step of setting period lengths of N light emitting periods, which are arranged in a one-field period, in response to the total light emitting period length such that the period lengths of the light emitting periods continue to keep a fixed ratio thereamong, N being equal to or higher than 3.

First claim

What is claimed is:

1. A display device comprising a plurality of pixels, each of the plurality of pixels including:
a light emitting element;
a driving transistor;
a sampling transistor;
a switching transistor; and
a capacitor,
wherein the sampling transistor is configured to supply a data voltage from a data line to the capacitor,
wherein the driving transistor is configured to control a drive current according to the data voltage,
wherein the switching transistor is configured to switch an electrical connection between the driving transistor and the light emitting element according to a control signal supplied from a driving section,
wherein, when a total light emitting period length is less than a maximum value, the light emitting element is configured to emit N times in each one field period, where N is an integer equal to or higher than 3, and
wherein, when a total light emitting period length is a maximum value, the light emitting element is configured to emit only one time in each one field period.

2. The display device according to claim 1 , wherein the total light emitting period length is controllable according to a brightness of external light.

3. The display device according to claim 1 , wherein the total light emitting period length is controllable by changing a type of an image to be displayed from a still picture type image to a moving picture type image.

4. The display device according to claim 3 , wherein the display device can reduce a motion blur.

5. The display device according to claim 1 , wherein the total light emitting period length is controllable by adjusting a brightness of a screen image.

6. The display device according to claim 1 , wherein N is odd number.

7. The display device according to claim 1 , wherein N is even number.

8. A display device comprising a plurality of pixels, each of the plurality of pixels including:
a light emitting element;
a driving transistor;
a sampling transistor;
a switching transistor; and
a capacitor,
wherein the sampling transistor is configured to supply a data voltage from a data line to the capacitor,
wherein the driving transistor is configured to control a drive current according to the data voltage,
wherein the switching transistor is configured to switch an electrical connection between the driving transistor and the light emitting element according to a control signal supplied from a driving section,
wherein, when a total light emitting period length is less than a maximum value, the light emitting element is configured to emit during N light emitting periods in each one field period, where N is an integer equal to or higher than 3, and
wherein, when a total light emitting period length reaches a maximum value, the light emitting element is configured to emit during a single light emitting period in each one field period.

9. The display device according to claim 8 , wherein the N light emitting periods are merged into the single light emitting period when the total light emitting period length reaches a maximum value therefor.

10. The display device according to claim 8 , wherein the total light emitting period length is controllable according to a brightness of external light.

11. The display device according to claim 8 , wherein the total light emitting period length is controllable by changing a type of an image to be displayed from a still picture type image to a moving picture type image.

12. The display device according to claim 11 , wherein the display device can reduce a motion blur.

13. The display device according to claim 8 , wherein the total light emitting period length is controllable by adjusting a brightness of a screen image.

14. The display device according to claim 8 , wherein N is odd number.

15. The display device according to claim 8 , wherein N is even number.

Assignees

• Sony Corp

Inventors

• Hasegawa Hiroshi
• Isobe Teppei
• Abe Hironobu

Classifications

• G09G2320/0233

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

• G09G2320/0261

  in the context of movement of objects on the screen or movement of the observer relative to the screen · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title