VIDEO SIGNAL PROCESSING CIRCUIT, VIDEO SIGNAL PROCESSING METHOD, DISPLAY DEVICE, AND ELECTRONIC APPARATUS

• US 20120320274A1
• Filed: 04/30/2012
• Published: 12/20/2012
• Est. Priority Date: 06/14/2011
• Status: Active Grant

• Current Assignee: JOLED Inc.
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Funatsu, Yohei
• Granted Patent: US 8,896,758 B2
• Time in Patent Office: Days
• US Class Current: 348/687
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

A video signal processing circuit includes: a control unit that calculates a luminance integrated value on the basis of an input video signal and performs luminance control for the video signal on the basis of the calculated luminance integrated value, wherein the control unit calculates the luminance integrated value at a period shorter than time equivalent to one frame.

Claims

1. A video signal processing circuit comprising:

a control unit that calculates a luminance integrated value on the basis of an input video signal and performs luminance control for the video signal on the basis of the calculated luminance integrated value, wherein

the control unit calculates the luminance integrated value at a period shorter than time equivalent to one frame.

2. The video signal processing circuit according to claim 1, wherein the control unit controls amplitude of the video signal to be small when the luminance integrated value is larger than a control target value.

3. The video signal processing circuit according to claim 1, wherein the period shorter than the time equivalent to one frame is a unit of time equivalent to one line.

4. The video signal processing circuit according to claim 3, wherein the period shorter than the time equivalent to one frame is the time equivalent to one line.

5. The video signal processing circuit according to claim 3, wherein the period shorter than the time equivalent to one frame is time equivalent to plural lines.

6. The video signal processing circuit according to claim 1, wherein the period shorter than the time equivalent to one frame is a unit of time equivalent to one dot.

7. A video signal processing circuit comprising:

a first control system that calculates a luminance integrated value at a period of time equivalent to one frame and controls a video signal on the basis of the calculated luminance integrated value; and

a second control system that calculates a luminance integrated value at a period shorter than the time equivalent to one frame and controls the video signal on the basis of the calculated luminance integrated value.

8. The video signal processing circuit according to claim 7, wherein the first control system and the second control system control the video signal to be small when the luminance integrated value is larger than a control target value.

9. The video signal processing circuit according to claim 7, wherein the second control system calculates the luminance integrated value in a unit of time equivalent to one line.

10. The video signal processing circuit according to claim 9, wherein the second control system calculates the luminance integrated value at a period of time equivalent to one line.

11. The video signal processing circuit according to claim 9, wherein the second control system calculates the luminance integrated value at a period of time equivalent to plural lines.

12. The video signal processing circuit according to claim 7, wherein the second control system calculates the luminance integrated value in a unit of time equivalent to one dot.

13. The video signal processing circuit according to claim 7, wherein the second control system is provided at a post-stage of the first control system.

14. The video signal processing circuit according to claim 13, wherein a control target value of the second control system is set to a value higher than a control target value of the first control system.

15. A video signal processing method comprising, in calculating a luminance integrated value on the basis of an input video signal and performing luminance control for the video signal on the basis of the calculated luminance integrated value,

calculating the luminance integrated value at a period shorter than time equivalent to one frame.

16. A display device comprising:

a control unit that calculates, on the basis of an input video signal, a luminance integrated value at a period shorter than time equivalent to one frame and performs luminance control for the video signal on the basis of the calculated luminance integrated value.

17. An electronic apparatus comprising:

a display device including a control unit that calculates, on the basis of an input video signal, a luminance integrated value at a period shorter than time equivalent to one frame and performs luminance control for the video signal on the basis of the calculated luminance integrated value.