Method and apparatus for correcting the output signal for a blanking period
First Claim
1. A method for driving a liquid crystal display device which uses a liquid crystal as a pixel, said method comprising the steps of:
- (i) the step of displaying an image by supplying an output signal for an image display period to a the pixel of the liquid crystal display device so as to control luminance of the pixel, the output signal corresponding to a video signal indicative of an image to be displayed by the liquid crystal display device, the step (i) being performed repeatedly; and
(ii) the step, performed between the steps (i), of controlling blanking by supplying an output signal for a blanking period to the pixel so that luminance of the pixel does not exceed luminance of the pixel in at least one of the steps (i) between which the step (ii) is performed or so that luminance of the pixel becomes a luminance for dark display,in the step (ii), when a change from first luminance to second luminance is a predetermined one where the first and second luminances are luminances indicated by output signals for image display periods in the steps (i) before and after the step (ii), the output signal for a blanking period being corrected so that the output signal for a blanking period has luminance which is corrected in a same direction as a direction of the change from the first luminance to the second luminance, the direction being a direction in which the luminance increases or decreases compared with an output signal for a blanking period obtained in a case where the first luminance is identical with the second luminance.
1 Assignment
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Accused Products
Abstract
Based on each of video data repeatedly supplied to a pixel, a signal processing section generates video data (Dd) for an image display period to be supplied to the pixel and video data (Db) for a blanking period to be supplied to the pixel, and outputs the video data (Dd) and (Db) in a predetermined order. Further, when a gradation transition from a gradation indicated by previous video data (D(i,j,k−2)) supplied to the pixel to a gradation indicated by current video data (D(i,j,k)) supplied to the pixel indicates an increase in luminance, a generating circuit for a blanking period of the signal processing section outputs video data indicative of a gradation which is increased compared with a gradation indicated by gradation data for a blanking period in a steady state, the video data thus outputted being regarded as video data (Db(i,j,k−1)) for a blanking period. This allows for providing a display device capable of displaying moving images with high quality.
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Citations
27 Claims
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1. A method for driving a liquid crystal display device which uses a liquid crystal as a pixel, said method comprising the steps of:
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(i) the step of displaying an image by supplying an output signal for an image display period to a the pixel of the liquid crystal display device so as to control luminance of the pixel, the output signal corresponding to a video signal indicative of an image to be displayed by the liquid crystal display device, the step (i) being performed repeatedly; and (ii) the step, performed between the steps (i), of controlling blanking by supplying an output signal for a blanking period to the pixel so that luminance of the pixel does not exceed luminance of the pixel in at least one of the steps (i) between which the step (ii) is performed or so that luminance of the pixel becomes a luminance for dark display, in the step (ii), when a change from first luminance to second luminance is a predetermined one where the first and second luminances are luminances indicated by output signals for image display periods in the steps (i) before and after the step (ii), the output signal for a blanking period being corrected so that the output signal for a blanking period has luminance which is corrected in a same direction as a direction of the change from the first luminance to the second luminance, the direction being a direction in which the luminance increases or decreases compared with an output signal for a blanking period obtained in a case where the first luminance is identical with the second luminance.
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2. A method for driving a liquid crystal display device which uses a liquid crystal as a pixel, said method comprising the steps of:
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(i) the step of displaying an image by supplying an output signal for an image display period to the pixel of the liquid crystal display device so as to control luminance of the pixel, the output signal corresponding to a video signal indicative of an image to be displayed by the liquid crystal display device, the step (i) being performed repeatedly; and (ii) the step, performed between the steps (i), of controlling blanking by supplying an output signal for a blanking period to the pixel so that luminance of the pixel does not exceed luminance of the pixel in at least one of the steps (i) between which the step (ii) is performed or so that luminance of the pixel becomes a luminance for dark display, in the step (ii), when a change from first luminance to second luminance is a predetermined one where the first and second luminances are luminances indicated by output signals for image display periods in the steps (i) before and after the step (ii), the output signal for a blanking period being corrected in accordance with the first luminance and the second luminance.
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3. A method for driving a liquid crystal display device which uses a liquid crystal as a pixel, said method comprising the steps of:
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(i) generating (a) gradation data for an image display period which is to be supplied to the pixel of the liquid crystal display device and (b) gradation data for a blanking period which is to be supplied to the pixel and is indicative of a gradation not brighter than a gradation indicated by the gradation data for an image display period or of a gradation for dark display, the generating being repeatedly performed based on gradation data supplied as gradation data to the pixel; and (ii) outputting in an order the gradation data (a) and (b) generated in a corresponding step (i), the step (ii) being performed to correspond to each of the steps (i), said method further comprising the step of, when a gradation transition from a gradation indicated by previous gradation data supplied to the pixel to a gradation indicated by current gradation data supplied to the pixel is a predetermined one, outputting gradation data indicative of a gradation which is corrected in a same direction as a direction of the gradation transition, the direction being a direction in which the gradation increases or decreases compared with gradation data for a blanking period obtained in a case where a gradation indicated by the previous gradation data and a gradation indicated by the current gradation data are identical with each other, the gradation data thus outputted being regarded as gradation data for a blanking period to be supplied between gradation data for an image display period supplied in the step (i) based on the previous gradation data and gradation data for an image display period supplied in the step (i) based on the current gradation data.
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4. A method for driving a liquid crystal display device which uses a liquid crystal as a pixel, said method comprising the steps of:
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(i) generating (a) gradation data for an image display period which is to be supplied to the pixel of the liquid crystal display device and (b) gradation data for a blanking period which is to be supplied to the pixel and is indicative of a gradation not brighter than a gradation indicated by the gradation data for an image display period or of a gradation for dark display, the generating being repeatedly performed based on gradation data supplied as gradation data to the pixel; and (ii) outputting in an order the gradation data (a) and (b) generated in a corresponding step (i), the step (ii) being performed to correspond to each of the steps (i), said method further comprising the step of, when a gradation transition from a gradation indicated by previous gradation data supplied to the pixel to a gradation indicated by current gradation data supplied to the pixel is a predetermined one, correcting gradation data for a blanking period supplied between gradation data for an image display period supplied in the step (i) based on the previous gradation data and gradation data for an image display period supplied in the step (i) based on the current gradation data, the correcting being performed based on the previous gradation data and the current gradation data.
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5. A driving device for a liquid crystal display device which uses a liquid crystal as a pixel, the driving device (i) controlling, during each of repeated image display periods, luminance of the pixel of the liquid crystal display device by supplying to the pixel an output signal for an image display period which output signal varies depending on a video signal indicative of an image to be displayed, till a next image display period, by the liquid crystal display device, and (ii) controlling, during each blanking period between the image display periods, luminance of the pixel by supplying to the pixel an output signal for a blanking period, so that luminance of the pixel does not exceed luminance in at least one of the image display periods between which the blanking period exists or so that the luminance becomes a luminance for dark display,
said device comprising blanking controlling means for, when a change from first luminance to second luminance is a predetermined one where the first and second luminances are luminances indicated by output signals for image display periods supplied during the image display periods before and after the blanking period, correcting the output signal for a blanking period so that the output signal for a blanking period has luminance which is corrected in a same direction as a direction of the change from the first luminance to the second luminance, the direction being a direction in which the luminance increases or decreases compared with an output signal for a blanking period obtained in a case where the first luminance is identical with the second luminance.
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6. A driving device for a liquid crystal display device which uses a liquid crystal as a pixel, the driving device (i) controlling, during each of repeated image display periods, luminance of the pixel of the liquid crystal display device by supplying to the pixel an output signal for an image display period which output signal varies depending on a video signal indicative of an image to be displayed, till a next image display period, by the liquid crystal display device, and (ii) controlling, during each blanking period between the repeated image display periods, luminance of the pixel by supplying to the pixel an output signal for a blanking period, so that luminance of the pixel does not exceed luminance in at least one of the image display periods between which the blanking period exists or so that the luminance becomes a luminance for dark display,
said device comprising blanking controlling means for, when a change from first luminance to second luminance is a predetermined one where the first and second luminances are luminances indicated by output signals for image display periods supplied during the image display periods between which the blanking period exists, correcting the output signal for a blanking period, based on the first luminance and the second luminance.
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7. A driving device for a liquid crystal display device which uses a liquid crystal as a pixel, the driving device (i) generating (a) gradation data for an image display period which is to be supplied to the pixel of the liquid crystal display device and (b) gradation data for a blanking period which is to be supplied to the pixel and is indicative of a gradation not brighter than a gradation indicated by the gradation data for an image display period or of a gradation for dark display, the gradation data (a) and (b) being generated based on each of gradation data repeatedly supplied to the pixel, and (ii) outputting the gradation data (a) and (b) in an order,
said device comprising blanking controlling means for, when a gradation transition from a gradation indicated by previous gradation data supplied to the pixel to a gradation indicated by current gradation data supplied to the pixel is a predetermined one, outputting gradation data indicative of a gradation which is corrected in a same direction as a direction of the gradation transition, the direction being a direction in which the gradation increases or decreases compared with gradation data for a blanking period obtained in a case where a gradation indicated by the previous gradation data and a gradation indicated by the current gradation data are identical with each other, the gradation data thus outputted being regarded as gradation data for a blanking period to be supplied between gradation data for an image display period generated based on the previous gradation data and gradation data for an image display period generated based on the current gradation data.
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8. A driving device for a liquid crystal display device which uses a liquid crystal as a pixel, the driving device (i) generating (a) gradation data for an image display period which is to be supplied to the pixel of the liquid crystal display device and (b) gradation data for a blanking period which is to be supplied to the pixel and is indicative of a gradation not brighter than a gradation indicated by the gradation data for an image display period or of a gradation for dark display, the gradation data (a) and (b) being generated based on each of gradation data repeatedly supplied to the pixel, and (ii) outputting the gradation data (a) and (b) in an order,
said device comprising blanking controlling means for, when a gradation transition from a gradation indicated by previous gradation data supplied to the pixel to a gradation indicated by current gradation data supplied to the pixel is a predetermined one, correcting gradation data for a blanking period supplied between gradation data for an image display period generated based on the previous gradation data and gradation data for an image display period generated based on the current gradation data, the gradation data for a blanking period being corrected based on the previous gradation data and the current gradation data.
Specification