Display device with luminance variation control unit

• US 8,531,383 B2
• Filed: 04/13/2010
• Issued: 09/10/2013
• Est. Priority Date: 04/17/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Toshima, Goki, Maruyama, Junichi, Hosogi, Koji, Owa, Misa, Ono, Kikuo
• Primary Examiner(s): JOHNSON, ALLISON WALTHALL
• Application Number:
  US12/759,068
• Publication Number:
  US 20100265405A1
• Time in Patent Office: 1,246 Days
• Field of Search: 345/82, 345/83, 345/102
• US Class Current: 345/102
• 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 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

Provided is a display device capable of producing an image of excellent quality with reduced flicker and little reduction in luminance, the display device including: a backlight having light sources such as LED devices arranged two-dimensionally, each of which may be individually modulated in luminance; a moving velocity detection unit VD1 (109) for detecting a moving velocity of an object in a video (for example, moving velocity of a foreground); and a luminance variation control unit (113) for automatically controlling luminance variations of the LED devices for each frame, in accordance with the moving velocity.

Claims

1. A display device for receiving input data of a video and displaying the video, comprising:

a display panel having a plurality of pixels arranged therein for displaying the video;

a backlight for irradiating the display panel, the backlight including a plurality of light sources and being controllable in luminance for each of the plurality of light sources;

a moving velocity detection unit for detecting a moving velocity of an object in the video;

a luminance variation control unit for controlling, for each of the plurality of light sources, a luminance variation of the light source in accordance with the moving velocity detected by the moving velocity detection unit;

an adjacent area irradiation computing unit for computing a luminance of a light source of at least one or all areas adjacent in upward, downward, rightward, leftward, and diagonal directions to a display area for displaying the object in the video, so that the at least one or all adjacent areas are irradiated in advance;

wherein the luminance variation control unit controls, as well as controlling the luminance variation of the light source in the display area in accordance with the moving velocity detected by the moving velocity detection unit, the luminances of the light sources in the adjacent areas in accordance with the luminance computed by the adjacent area irradiation computing unit; and

an object moving direction detection unit for detecting a moving direction of the object in the video;

wherein the adjacent area irradiation computing unit computes a luminance of a light source in an adjacent area that is a move destination of the object in the video, so that the adjacent area is irradiated in advance.

2. The display device according to claim 1, wherein the luminance variation control unit sets the luminance variation to a first value in a case where the moving velocity of the object in the video is high, and sets the luminance variation to a second value in a case where the moving velocity of the object in the video is low.

3. The display device according to claim 2, wherein the first value is larger than the second value.

4. The display device according to claim 3, further comprising a register capable of externally adjusting the first value and the second value.

5. The display device according to claim 4, wherein the second value is adjustable in smaller units as compared with the first value.