Image processing method, display device and driving method thereof

A driving method of a hold type display device for displaying light with a luminance corresponding to an inputted video signal in a display element for a predetermined period, comprising:

• time dividing the video signal for one frame period into a plurality of sub frames;
• distributing at least a part of luminance components of the video signal of a predetermined sub frame to the video signal of other sub frames of which luminance components are not saturated, wherein light with a luminance corresponding to the video signal of each sub frame to which the luminance components are distributed, is displayed by said display element for the period of each sub frame, and an integrated luminance in one entire frame period is kept constant, and a drive frequency is set higher than a frame frequency,
• wherein a response time is shorter than the sub frame period, or the response time is longer than the sub frame period, and overdrive processing is performed when the response time is longer than the sub frame period, and
• wherein in a case where a first response time at a time of decreasing a gradation value of the hold type display is faster than a second response time at a time of increasing the gradation value, a first luminance component distributed to a first sub frame just before the predetermined sub frame is not lower than a second luminance component distributed to a second sub frame just before the first sub frame, and in a case where the second response time is faster than the first response time, the first luminance component is not higher than the second luminance component.

A hold-type display device comprising:

• image processing means for outputting an inputted video signal as a gradation signal after subjecting the inputted video signal to an image processing;
• and
• display means for performing picture display with a luminance in accordance with the gradation signal outputted from said image processing means,
• said image processing means comprising:
• means for time-dividing a video signal for one frame into a plurality of sub frames;
• and
• means for specifying an order number of each time divided sub frame, the order number being assigned to each sub frame in one frame;
• and
• gradation conversion means for generating gradation signals for said each sub frame, so that at least a part of luminance components of the video signal of a predetermined sub frame is distributed to the video signal of other sub frames of which luminance components are not saturated, and an integrated luminance in one entire frame period is kept constant, and a drive frequency is set higher than a frame frequency,
• wherein the display device is configured so a response time is shorter than a sub frame period, or the response time is longer than the sub frame period, and overdrive processing is performed when the response time is longer than the sub frame period, and
• wherein in a case where a first response time at a time of decreasing a gradation value of the hold-type display is faster than a second response time at a time of increasing the gradation value, a first luminance component distributed to a first sub frame just before the predetermined sub frame is not lower than a second luminance component distributed to a second sub frame just before the first sub frame, and in a case where the second response time is faster than the first response time, the first luminance component is not higher than the second luminance component.

A hold-type display device comprising:

• gradation voltage generation means for generating a gradation voltage signal based on an inputted video signal and for outputting the gradation voltage signal;
• and
• display means for performing screen display with a luminance in accordance with said gradation voltage signal;
• means for time-dividing the video signal for one frame into a plurality of sub frames;
• means for specifying an order number of video signal of each time divided sub frame, the order number being assigned to each sub frame in one frame;
• and
• means for changing a reference value so as to enable said gradation voltage generation means to generate said gradation voltage signal, so that at least a part of luminance components of video signal of a predetermined sub frame is distributed to the video signal of other sub frames of which luminance components are not saturated, and an integrated luminance in one entire frame period is kept constant, and a drive frequency is set higher than a frame frequency,
• wherein the display device is configured so a response time is shorter than a sub frame period, or the response time is longer than the sub frame period, and overdrive processing is performed when the response time is longer than the sub frame period, and
• wherein in a case where a first response time at a time of decreasing a gradation value of the hold-type display is faster than a second response time at a time of increasing the gradation value, a first luminance component distributed to a first sub frame just before the predetermined sub frame is not lower than a second luminance component distributed to a second sub frame just before the first sub frame, and in a case where the second response time is faster than the first response time, the first luminance component is not higher than the second luminance component.