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US 9,805,666 B2Granted
Liquid crystal display system and method
AssigneeKoninklijke Philips N.V.
InventorsJurgen Jean Louis Hoppenbrouwers, Martin Jacobus Johan Jak, Wilhelmus Henricus Maria Van Beek
Life of this patent
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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.
Claims31
A method for displaying image information in a display system comprising:
- determining, from the image information, a maximum pixel luminance in a region of a light modulation device, wherein a light source of an illumination device is configured to illuminate the region of the light modulation device;
- selecting a distribution factor based on a predetermined distribution factor function that is configured to select a given distribution factor for a plurality of pixel luminances below a predetermined maximum pixel luminance and is configured to select which one of a plurality of distribution factors larger than the given distribution factor corresponds to the maximum pixel luminance when the maximum pixel luminance is above the predetermined maximum pixel luminance;
- calculating a luminance of the light source by applying the selected distribution factor to the maximum pixel luminance and calculating a transmission of the light modulation device for a pixel corresponding to the maximum pixel luminance;
- and
- displaying the maximum pixel luminance at the pixel by configuring the light source of the illumination device to output said luminance of the light source and by configuring the light modulation device to implement the calculated transmission at the pixel.
2 more elements
A system for displaying image information comprising:
- a light modulation device including a pixel region;
- an illumination device including a light source that is configured to illuminate the pixel region of the light modulation device;
- and
- a control circuit configured to
- determine, from the image information, a maximum pixel luminance in the pixel region of the light modulation device,
- select a distribution factor based on a predetermined distribution factor function that is configured to select a given distribution factor for a plurality of pixel luminances below a predetermined maximum pixel luminance and is configured to select which one of a plurality of distribution factors larger than the given distribution factor corresponds to the maximum pixel luminance when the maximum pixel luminance is above the predetermined maximum pixel luminance,
- calculate a luminance of the light source by applying the selected distribution factor to the maximum pixel luminance and calculate a transmission of the light modulation device for a pixel corresponding to the maximum pixel luminance, and
- configure the light source of the illumination device to output said luminance of the light source and configure the light modulation device to implement the calculated transmission at the pixel such that the maximum pixel luminance is displayed at the pixel.
5 more elements
A method for displaying image information in a display system comprising:
- determining, from the image information, a maximum pixel luminance in a region of a light modulation device;
- selecting a distribution factor, which corresponds to the maximum pixel luminance, based on a predetermined distribution factor function that associates a plurality of distribution factors with a plurality of pixel luminances;
- calculating a luminance of a light source of an illumination device configured to illuminate the region of the light modulation device by applying the selected distribution factor to the maximum pixel luminance and calculating a transmission of the light modulation device for a pixel corresponding to the maximum pixel luminance, wherein the applying comprises applying the selected distribution factor as a power of a fraction of the maximum pixel luminance;
- and
- displaying the maximum pixel luminance at the pixel by configuring the light source of the illumination device to output said luminance of the light source and by configuring the light modulation device to implement the calculated transmission at the pixel.
2 more elements
A method for displaying image information in a display system comprising:
- determining, from the image information, a maximum pixel luminance in a region of a light modulation device, wherein a light source of an illumination device is configured to illuminate the region of the light modulation device;
- selecting a distribution factor, which corresponds to the maximum pixel luminance, based on a predetermined distribution factor function that associates a plurality of distribution factors with a plurality of pixel luminances, wherein a majority of distribution factor variances in said function occur only for a subrange of pixel luminances displayable by the light source;
- calculating a luminance of the light source by applying the selected distribution factor to the maximum pixel luminance and calculating a transmission of the light modulation device for a pixel corresponding to the maximum pixel luminance;
- and
- displaying the maximum pixel luminance at the pixel by configuring the light source of the illumination device to output said luminance of the light source and by configuring the light modulation device to implement the calculated transmission at the pixel.
2 more elements
A system for displaying image information comprising:
- a light modulation device including a pixel region;
- an illumination device including a light source that is configured to illuminate the pixel region of the light modulation device;
- and
- a control circuit configured to
- determine, from the image information, a maximum pixel luminance in the pixel region of the light modulation device,
- select a distribution factor, which corresponds to the maximum pixel luminance, based on a predetermined distribution factor function that associates a plurality of distribution factors with a plurality of pixel luminances,
- calculate a luminance of the light source by applying the selected distribution factor to the maximum pixel luminance and calculate a transmission of the light modulation device for a pixel corresponding to the maximum pixel luminance, wherein the applying comprises applying the selected distribution factor as a power of a fraction of the maximum pixel luminance, and
- configure the light source of the illumination device to output said luminance of the light source and configure the light modulation device to implement the calculated transmission at the pixel such that the maximum pixel luminance is displayed at the pixel.
5 more elements
A system for displaying image information comprising:
- a light modulation device including a pixel region;
- an illumination device including a light source that is configured to illuminate the pixel region of the light modulation device;
- and
- a control circuit configured to
- determine, from the image information, a maximum pixel luminance in the pixel region of the light modulation device,
- select a distribution factor, which corresponds to the maximum pixel luminance, based on a predetermined distribution factor function that associates a plurality of distribution factors with a plurality of pixel luminances, wherein a majority of distribution factor variances in said function occur only for a subrange of pixel luminances displayable by the light source,
- calculate a luminance of the light source by applying the selected distribution factor to the maximum pixel luminance and calculate a transmission of the light modulation device for a pixel corresponding to the maximum pixel luminance, and
- configure the light source of the illumination device to output said luminance of the light source and configure the light modulation device to implement the calculated transmission at the pixel such that the maximum pixel luminance is displayed at the pixel.
5 more elements
Dependencies are inferred from the claim text.