US 2010/0141674 A1 · DISPLAY DEVICE

Abstract

The disclosed invention provides a display device for performing a gradation display, using a plurality of subframes of image into which one frame of image is divided, and a display method that reduces dynamic false contour noises occurring when the image is displayed and is suitable for plasma display panels and the like. Dynamic false contour noise reduction is performed by detecting luminance on/off state change (carry up/carry down) in a region where a smooth tone level change occurs and interchanging the tone values of pixels in the region. The reduction processing is controlled, based on an amount of motion of an original image and a display load ratio, so that dynamic false contour noise reduction is performed favorably. By carrying out different ways of processing for each frame, noise reduction in the time domain is performed.

Claims13

Dependent claims

A display device for displaying a gradation by making up one frame of a plurality of subframes having different weights of luminance and combining luminances of the subframes, the display device comprising:

a motion amount detecting unit that detects an amount of motion of an input image to be displayed;
a luminance on/off state change detecting unit that detects a luminance on/off state change point of per-pixel lighting in at least a subframe having the largest weight of luminance among subframes in which contiguous pixels are lighted up;
and
a pixel value interchanging unit that interchanges the tone values of a plurality of pixels before and after the luminance on/off state change point detected by the luminance on/off state change detecting unit,
wherein the display device is configured such that a pixel value interchange range across pixels whose tone values are to be interchanged is controlled according to the amount of motion.

2 more elements

a display load ratio calculating unit that calculates a display load ration based on an input image signal;
a luminance on/off state change detecting unit that detects a luminance on/off state change point of per-pixel lighting in at least a subframe having the largest weight of luminance among subframes in which contiguous pixels are lighted up;
and
a pixel value interchanging unit that interchanges the tone values of a plurality of pixels before and after the luminance on/off state change point detected by the luminance on/off state change detecting unit,
wherein, the number of subframes targeted by the luminance on/off state change detecting unit for detection is controlled, based on the display load ratio calculated by the display load ratio calculating unit.

2 more elements

Dependencies are inferred from the claim text.

Display device

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Display device

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Abstract

Claims13