LIQUID CRYSTAL DISPLAY SYSTEM AND METHOD
First Claim
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1. A display system (1) for generating a picture in accordance with image information (10) derived from a video signal, comprising:
- A light modulation device (20) having a multitude of pixels (21) with variable transmission,An illumination device (30) for illuminating the light modulation device,A control circuit (40), for driving both the light modulation device and the illumination device,The light modulation device, when in operation, having at least one region in which a pixel PLregionmax, i exhibits the largest luminance in accordance with the image information (10) for said region,characterized in thatThe control circuit is arranged to distribute the image information over the light modulation device and the illumination device bySetting the transmission of pixel PLregionmax, i to its maximum,Setting the luminance LBL,i of the illumination device (30) behind said region in accordance with the luminance of pixel PLregionmax, i,Adjusting the transmission of the other pixels (21) in said region in accordance with the image information (10) and LBL,i.
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Abstract
A display system (1) for generating a picture in accordance with image information (10) derived from a video signal has a light modulation device (20), an illumination device (30) and a control circuit (40) for driving both devices. The algorithm implemented in the control circuit (40) distributes the image information (10) over the light modulation device (20) and the illumination device (30) in order to minimize the power consumption of the display system.
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Citations
7 Claims
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1. A display system (1) for generating a picture in accordance with image information (10) derived from a video signal, comprising:
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A light modulation device (20) having a multitude of pixels (21) with variable transmission, An illumination device (30) for illuminating the light modulation device, A control circuit (40), for driving both the light modulation device and the illumination device, The light modulation device, when in operation, having at least one region in which a pixel PLregionmax, i exhibits the largest luminance in accordance with the image information (10) for said region, characterized in that The control circuit is arranged to distribute the image information over the light modulation device and the illumination device by Setting the transmission of pixel PLregionmax, i to its maximum, Setting the luminance LBL,i of the illumination device (30) behind said region in accordance with the luminance of pixel PLregionmax, i, Adjusting the transmission of the other pixels (21) in said region in accordance with the image information (10) and LBL,i.
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2. A display system (1) for generating a picture in accordance with image information (10) derived from a video signal, comprising:
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A light modulation device (20) having a multitude of pixels (21) with variable transmission, An illumination device (30) for illuminating the light modulation device, A control circuit (40), for driving both the light modulation device and the illumination device, The light modulation device, when in operation, having at least one region in which a pixel PLregionmax, i exhibits a luminance Lpic, regionmax, i and having a pixel PLmax exhibiting the largest luminance Lpic, max of the display system (1) in accordance with the image information (10), characterized in that The control circuit is arranged to distribute the image information over the light modulation device and the illumination device by Selecting a parameter a from the range ½
<
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1 dependent on the luminance level(s) Lpic, regionmax, iSetting the luminance LBL,i of the illumination device (30) behind said at least one region according to the formula Adjusting the transmission of the other pixels (21) in said region in accordance with the image information (10) and LBL,i. - View Dependent Claims (3, 4)
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5. A method to minimize a power consumption of a display system (1) for generating a picture in accordance with image information (10) derived from a video signal, the display system comprising:
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A light modulation device (20) having a multitude of pixels (21) with variable transmission, An illumination device (30) for illuminating the light modulation device, A control circuit (40), for driving both the light modulation device and the illumination device, The method comprising the step of distributing the image information (10) over the light modulation device (20) and the illumination device (30) by; Dividing the light modulation device (20) in at least one region, Determining for each of the at least one regions a pixel PLregionmax, i exhibiting the largest luminance Lpic,regionmax, i, Setting the transmission of each pixel PLregionmax, i to its maximum, Setting the luminance LBL,i of the illumination device (30) behind each of said regions in accordance with Lpic,regionmax, i, Adjusting the transmission of the other pixels (21) in each of said regions in accordance with the image information (10) and LBL,i.
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6. A method to minimize a power consumption of a display system (1) for generating a picture in accordance with image information (10) derived from a video signal, the display system comprising:
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A light modulation device (20) having a multitude of pixels (21) with variable transmission, An illumination device (30) for illuminating the light modulation device, A control circuit (40), for driving both the light modulation device and the illumination device, The method comprising the step of distributing the image information (10) over the light modulation device (20) and the illumination device (30) by; Dividing the light modulation device (20) in at least one region, Determining for each of the at least one regions a pixel PLregionmax, i exhibiting the largest luminance Lpic,regionmax, i, Determining a pixel PLmax exhibiting the largest luminance Lpic, max of the display system (1) in accordance with the image information (10), Selecting a parameter a from the range ½
a≦
1 dependent on the luminance level(s) Lpic, regionmax, iSetting the luminance LBL,i of the illumination device (30) behind said at least one region according to the formula Adjusting the transmission of the other pixels (21) in said region in accordance with the image information (10) and LBL,i. - View Dependent Claims (7)
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Specification