Liquid crystal display with area adaptive backlight
AssigneeSharp Laboratories of America, Inc.
InventorsFeng Li, Xiao-Fan Feng
Life of this patent
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Abstract
A backlight display has improved display characteristics. An image is displayed on the display which includes a liquid crystal material with a light valve. The display receives an image signal and modifies the light for a backlight array and a liquid crystal layer.
Claims16
A method for displaying an image on a liquid crystal display including a light valve and a backlight array of individually controllable lighting elements, where said display has a leakage value representing the intensity of light that passes through closed liquid crystal elements of said display, said method comprising:
- (a) receiving an image;
- (b) modifying said image to provide data to said light valve;
- (c) modifying said image to provide data to said backlight array;
- (d) wherein said data provided to said backlight array is based upon maintaining the following constraints:
- (i) the lighting element value is greater than a corresponding pixel value;
- (ii) the lighting element is decreased in value when less than the leakage value of the display;
- and
- (e) wherein said data to said backlight array is determined by a sequence of iteratively calculated values based on a crosstalk constraint, and such that:
- (i) the difference between each successive pair of iterated values is calculated;
- and
- (ii) iteration ends when the calculated said difference between a successive pair of iterated values is less than a threshold.
A method for displaying an image on a liquid crystal display including a light valve and a backlight array of individually controllable lighting elements comprising:
- (a) receiving an image;
- (b) modifying said image to provide data to said light valve;
- (c) modifying said image to provide data to said backlight array;
- (d) wherein said data provided to said backlight array is based upon maintaining the following constraint:
- (i) the lighting element value is based upon the substantial maximum of the image data for the corresponding portion of the image;
- (e) wherein said data provided to said light value corresponding to said lighting element is suitable to provide the desired illumination for said image;
- and
- (f) wherein said data to said backlight array is determined by a sequence of iteratively calculated values based on a crosstalk constraint, and such that:
- (i) the difference between each successive pair of iterated values is calculated;
- and
- (ii) iteration ends when the calculated said difference between a successive pair of iterated values is less than a threshold.
A method for displaying an image on a liquid crystal display including a light valve and a backlight array of individually controllable lighting elements comprising:
- (a) receiving an image;
- (b) modifying said image to provide data to said light valve;
- (c) modifying said image to provide data to said backlight array;
- (d) wherein said data provided to said backlight array is determined by a sequence of iteratively calculated values based on a crosstalk constraint, and such that:
- (i) the difference between each successive pair of iterated values is calculated;
- and
- (ii) iteration ends when the calculated said difference between a successive pair of iterated values is less than a threshold.
A method for displaying an image on a liquid crystal display including a light valve and a backlight array of individually controllable lighting elements comprising:
- (a) receiving an image;
- (b) modifying said image to provide data to said light valve;
- (c) modifying said image to provide data to said backlight array;
- (d) wherein said data provided to said backlight array is based upon a temporal filter and determined by a sequence of iteratively calculated values based on a crosstalk constraint, and such that:
- (i) the difference between each successive pair of iterated values is calculated;
- and (ii) iteration ends when the calculated said difference between a successive pair of iterated values is less than a threshold.
A method for displaying an image on a liquid crystal display including a light valve and a backlight array of individually controllable lighting elements comprising:
- (a) receiving an image;
- (b) modifying said image to provide data to said light valve;
- (c) modifying said image to provide data to said backlight array;
- (d) wherein said data provided to said backlight array is determined by a sequence of iteratively calculated values based on a crosstalk constraint, and such that:
- (i) the difference between each successive pair of iterated values is calculated;
- and
- (ii) iteration ends when the calculated said difference between a successive pair of iterated values is less than a threshold, said calculated pair of iterated values based upon a data structure denser than the individual backlight array elements.
Dependencies are inferred from the claim text.