BACKLIGHT CONTROLLING APPARATUS, BACKLIGHT CONTROLLING METHOD AND PROGRAM

• US 20130234922A1
• Filed: 03/04/2013
• Published: 09/12/2013
• Est. Priority Date: 03/07/2012
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tatsumi, Eisaku
• Granted Patent: US 9,653,026 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A timing controller performs control to cause a backlight to emit light at first brightness for a first time in a period that original image data is displayed on a liquid crystal panel, and cause the backlight to emit light at second brightness darker than the first brightness for a second time longer than the first time in a period that intermediate image data generated based on the original image data is displayed on the liquid crystal panel.

Claims

1. A backlight controlling apparatus which controls a backlight used in a displaying apparatus for displaying image data, comprising:

a controlling unit configured to perform control to cause the backlight to emit light at first brightness for a first time in a period that original image data is displayed on the displaying apparatus, and cause the backlight to emit light at second brightness darker than the first brightness for a second time longer than the first time in a period that intermediate image data generated based on the original image data is displayed on the displaying apparatus.

2. The backlight controlling apparatus according to claim 1, wherein the controlling unit controls the backlight so that luminance of the original image data is approximately equal to luminance of the intermediate image data.

3. The backlight controlling apparatus according to claim 1, wherein the controlling unit controls the backlight so that luminance of the intermediate image data is more than a quarter of luminance of the original image data.

4. The backlight controlling apparatus according to claim 1, wherein the controlling unit controls the backlight so that luminance of the intermediate image data is twice as much as luminance of the original image data or less.

5. The backlight controlling apparatus according to claim 1, wherein the number of frames of the intermediate image data is one time to three times as many as the number of frames of the original image data.

6. The backlight controlling apparatus according to claim 1, wherein the controlling unit controls the backlight in a scanning manner.

7. The backlight controlling apparatus according to claim 1, wherein the controlling unit independently controls each block in the backlight of a direct-beneath type.

8. The backlight controlling apparatus according to claim 1, wherein the controlling unit simultaneously blinks a whole surface of the backlight.

9. The backlight controlling apparatus according to claim 1, wherein the controlling unit performs the control to cause the backlight to intermittently emit light at least either at a time when emitting light at the first brightness or at a time when emitting light at the second brightness.

10. The backlight controlling apparatus according to claim 1, further comprising a display controlling unit configured to display the original image data and the intermediate image data so that a gradation of the intermediate image data is lower than a gradation of the original image data,

wherein the controlling unit causes the backlight to emit light in an even light quantity.

11. A backlight controlling method which is performed by a backlight controlling apparatus which controls a backlight used in a displaying apparatus for displaying image data, comprising:

performing control to cause the backlight to emit light at first brightness for a first time in a period that original image data is displayed on the displaying apparatus, and cause the backlight to emit light at second brightness darker than the first brightness for a second time longer than the first time in a period that intermediate image data generated based on the original image data is displayed on the displaying apparatus.

12. A program for causing a computer to perform a backlight controlling method which is performed by a backlight controlling apparatus which controls a backlight used in a displaying apparatus for displaying image data,

wherein the program causes the computer to perform control to cause the backlight to emit light at first brightness for a first time in a period that original image data is displayed on the displaying apparatus, and causes the backlight to emit light at second brightness darker than the first brightness for a second time longer than the first time in a period that intermediate image data generated based on the original image data is displayed on the displaying apparatus.

13. A backlight controlling apparatus which controls a backlight used in a displaying apparatus for displaying image data, comprising:

a controlling unit configured to perform control to cause the backlight to emit light at first brightness for a first time and cause the backlight to emit light at second brightness darker than the first brightness for a second time longer than the first time, in a period that the image data of one frame is displayed on the displaying apparatus.

14. The backlight controlling apparatus according to claim 13, wherein luminance by the light emission at the first brightness in the first time is approximately equal to luminance by the light emission at the second brightness in the second time.

15. The backlight controlling apparatus according to claim 13, wherein luminance by the light emission at the second brightness in the second time is more than a quarter of luminance by the light emission at the first brightness in the first time.

16. The backlight controlling apparatus according to claim 13, wherein luminance by the light emission at the second brightness in the second time is twice as much as luminance by the light emission at the first brightness in the first time or less.

17. The backlight controlling apparatus according to claim 13, wherein the backlight is caused to emit light twice or more at the second brightness every time the backlight is caused to emit light once at the first brightness.

18. The backlight controlling apparatus according to claim 13, wherein the controlling unit controls the backlight in a scanning manner.

19. The backlight controlling apparatus according to claim 13, wherein the controlling unit independently controls each block in the backlight of a direct-beneath type.

20. The backlight controlling apparatus according to claim 13, wherein the controlling unit simultaneously blinks a whole surface of the backlight.

21. The backlight controlling apparatus according to claim 13, wherein the controlling unit performs the control to cause the backlight to intermittently emit light at least either at a time when emitting light at the first brightness or at a time when emitting light at the second brightness.

22. The backlight controlling apparatus according to claim 13, wherein the controlling unit controls to continuously change luminance at least either at a time when emitting light at the first brightness or at a time when emitting light at the second brightness.

23. A backlight controlling method which is performed by a backlight controlling apparatus which controls a backlight used in a displaying apparatus for displaying image data, comprising:

performing control to cause the backlight to emit light at first brightness for a first time and cause the backlight to emit light at second brightness darker than the first brightness for a second time longer than the first time, in a period that the image data of one frame is displayed on the displaying apparatus.

24. A program for causing a computer to perform a backlight controlling method which is performed by a backlight controlling apparatus which controls a backlight used in a displaying apparatus for displaying image data,

wherein the program causes the computer to perform control to cause the backlight to emit light at first brightness for a first time and cause the backlight to emit light at second brightness darker than the first brightness for a second time longer than the first time, in a period that the image data of one frame is displayed on the displaying apparatus.