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-9953578-B2
Application number	US-201715682964-A
Country	US
Kind code	B2
Filing date	Aug 22, 2017
Priority date	Feb 8, 2008
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

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 method for driving a display device including a plurality of pixels, the method comprising:
adjusting a brightness of the display device,
providing an image signal to one of the pixels through a sampling transistor, and
causing a light emitting element of said one of the pixels to emit light in accordance with the image signal during a determined light emitting period within one field period and the adjusted brightness,
wherein, when a total light emitting period length within said one field period is less than a maximum value, the light emitting element emits at least 4 times in each one field period, and
wherein, when a total light emitting period length is a maximum value, the light emitting element emits only one time in each one field period.

2. The method according to claim 1 , wherein said adjusting the brightness of the display device is based on a property selected from a group consisting of (i) a type of an image associated with the image signal, (ii) a brightness of external light, and (iii) a temperature of a display panel of the display device.

3. The method according to claim 2 , wherein said adjusting the brightness of the display device is based on the type of the image associated with the image signal.

4. The method according to claim 2 , wherein said adjusting the brightness of the display device is based on the brightness of external light.

5. The method according to claim 2 , wherein said adjusting the brightness of the display device is based on the temperature of the display panel of the display device.

6. A method for driving a display device including a plurality of pixels, the method comprising:
adjusting a brightness of the display device,
providing an image signal to one of the pixels through a sampling transistor, and
causing a light emitting element of said one of the pixels to emit light in accordance with the image signal during a determined light emitting period within one field period and the adjusted brightness,
wherein, when a total light emitting period length within said one field period is less than a maximum value, the light emitting element emits at least 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 emits only one time in each one field period.

7. The method according to claim 6 , wherein said adjusting the brightness of the display device is based on a property selected from a group consisting of (i) a type of an image associated with the image signal, (ii) a brightness of external light, and (iii) a temperature of a display panel of the display device.

8. The method according to claim 7 , wherein said adjusting the brightness of the display device is based on the type of the image associated with the image signal.

9. The method according to claim 7 , wherein said adjusting the brightness of the display device is based on the brightness of external light.

10. The method according to claim 7 , wherein said adjusting the brightness of the display device is based on the temperature of the display panel of the display device.

11. An apparatus for driving a display device including a plurality of pixels, the apparatus comprising:
driving circuitry configured to adjust a brightness of the display device, provide an image signal to one of the pixels through a sampling transistor, and cause a light emitting element of said one of the pixels to emit light in accordance with the image signal during a determined light emitting period within one field period and the adjusted brightness,
wherein, when a total light emitting period length within said one field period is less than a maximum value, the light emitting element emits at least 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 emits only one time in each one field period.

12. The apparatus according to claim 11 , wherein the driving circuitry is configured to adjust the brightness of the display device based on a property selected from a group consisting of (i) a type of an image associated with the image signal, (ii) a brightness of external light, and (iii) a temperature of a display panel of the display device.

13. The apparatus according to claim 12 , wherein the driving circuitry is configured to adjust the brightness of the display device based on the type of the image associated with the image signal.

14. The apparatus according to claim 12 , wherein the driving circuitry is configured to adjust the brightness of the display device based on the brightness of external light.

15. The apparatus according to claim 12 , wherein the driving circuitry is configured to adjust the brightness of the display device based on the temperature of the display panel of the display device.

Assignees

• Sony Corp

Inventors

• Hasegawa Hiroshi
• Isobe Teppei
• Abe Hironobu

Classifications

• G09G2320/064

  by time modulation of the brightness of the illumination source · CPC title

• G09G2320/0247

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

• G09G5/10

  Intensity circuits · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G2300/0842

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