DISPLAY DEVICE, A RECEIVING DEVICE AND A METHOD FOR DRIVING THE DISPLAY DEVICE

• US 20100002009A1
• Filed: 07/07/2006
• Published: 01/07/2010
• Est. Priority Date: 12/22/2005
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Takata, Yoshiki
• Application Number:
  US12/086,887
• Publication Number:
  US 20100002009A1
• Time in Patent Office: Days
• US Class Current: 345/589
• CPC Class Codes: G02F 1/133397 for suppressing after-image or image-sticking
• CPC Class Codes: G02F 1/133601 for spatial active dimming
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G09G 2310/0237 Switching ON and OFF the backlight within one frame
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• 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 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/106 Determination of movement vectors or equivalent parameters within the image
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

One embodiment of the device includes a display panel and a light source evenly placed behind the panel, wherein the light source includes light source blocks divided and arranged in a matrix, includes an image judging unit which divides one frame of a video input signal into frame blocks each corresponding to a size of each of the light source blocks and judging whether images of the frame blocks are moving or still, and a light source block driving unit which blinks the light source block corresponding to the frame block the image of which is judged as moving by the judging unit upon receiving optical responses from the cells while turning on all the time the light source block corresponding to the frame block the image of which is judged as still by the judging unit.

Claims

1. A display device comprising a display panel comprising display cells placed in the vicinity of intersections between a plurality of scanning lines and a plurality of signal lines which intersect with each other at a right angle, and a light source evenly placed behind the display panel,

wherein the light source comprises a plurality of light source blocks divided and arranged in a matrix, and

the display device further comprising:

an image judging unit arranged to divide one frame of a video input signal into a plurality of frame blocks each corresponding to a size of each of the light source blocks and judge whether respective images of the frame blocks are a moving image or a still image; and

a light source block driving unit arranged to blink the light source block corresponding to the frame block the image of which has been judged as a moving image by the image judging unit upon receipt of optical responses from the display cells while arranged to turn on all the time the light source block corresponding to the frame block the image of which has been judged as a still image by the image judging unit.

2. The display device according to claim 1, wherein the light source block driving unit is arranged to turn off the light source block corresponding to the frame block the image of which has been judged as a moving image until the optical responses from the display cells are sufficiently received, and turn on the light source block when the optical responses from the display cells are sufficiently received.

3. The display device according to claim 1, wherein the light source block in its blinking operation is arranged so that a turn-on time period of the light source block is shorter as the moving image moves faster.

4. The display device according to claim 1, wherein the light source block during the turn-on time period in its blinking operation is arranged so that a light amount of the light source block increases as the turn-on time period in its blinking operation is shorter.

5. A receiving device comprising the display device according to claim 1.

10. The display device according to claim 2, wherein the light source block in its blinking operation is arranged so that a turn-on time period of the light source block is shorter as the moving image moves faster.

11. The display device according to claim 2, wherein the light source block during the turn-on time period in its blinking operation is arranged so that a light amount of the light source block increases as the turn-on time period in its blinking operation is shorter.

12. The display device according to claim 2, wherein the light source block during the turn-on time period in its blinking operation is arranged so that a light amount of the light source block increases as the turn-on time period in its blinking operation is shorter.

13. A receiving device comprising the display device according to claim 2.

14. A receiving device comprising the display device according to claim 3.

15. A receiving device comprising the display device according to claim 4.

6. A method for driving a display device comprising a display panel comprising display cells placed in the vicinity of intersections between a plurality of scanning lines and a plurality of signal lines which intersect with each other at a right angle, and a light source evenly placed behind the display panel, the method comprising the steps of:

an image judging step of dividing one frame of a video input signal into a plurality of frame blocks each corresponding to a size of each of the light source blocks and judging whether respective images for the frame blocks are a moving image or a still image; and

a light source block driving step of blinking the light source block corresponding to the frame block the image of which has been judged as a moving image by the image judging unit upon receipt of optical responses from the display cells while arranged to turn on all the time the light source block corresponding to the frame block the image of which has been judged as a still image by the image judging unit.

7. The method for driving the display device according to claim 6, wherein the light source block driving unit is arranged to turn off the light source block corresponding to the frame block the image of which has been judged as a moving image until the optical responses from the display cells are sufficiently received, and turn on the light source block when the optical responses from the display cells are sufficiently received.

8. The method for driving the display device according to claim 6, wherein the light source block in its blinking operation is arranged so that a turn-on time period of the light source block is shorter as the moving image moves faster.

9. The method for driving the display device according to claim 6, wherein the light source block during the turn-on time period in its blinking operation is arranged so that a light amount of the light source block increases as the turn-on time period in its blinking operation is shorter.

16. The method for driving the display device according to claim 7, wherein the light source block in its blinking operation is arranged so that a turn-on time period of the light source block is shorter as the moving image moves faster.

17. The method for driving the display device according to claim 7, wherein the light source block during the turn-on time period in its blinking operation is arranged so that a light amount of the light source block increases as the turn-on time period in its blinking operation is shorter.

18. The method for driving the display device according to claim 8, wherein the light source block during the turn-on time period in its blinking operation is arranged so that a light amount of the light source block increases as the turn-on time period in its blinking operation is shorter.