Backlit display with improved dynamic range
First Claim
Patent Images
1. A backlit display, comprising:
- a backlight to output light at a controllable luminance level; and
a light valve to control, per pixel, transmittance of light from said backlight to create an image, wherein in each of a plurality of areas that constitute at least part of said image, luminance of said backlight is controllable in a first manner based upon a first determined brightness property value relating to brightness of said image to be displayed in said each area, and wherein control of said luminance of said backlight is switchable to control in a second manner, different from said control performed in the first manner, based upon a second determined brightness property value relating to brightness of said image to be displayed in said each area, the second brightness property being different from the first brightness property, wherein control in the first manner includes one of luminance attenuation and luminance increase and control in the second manner includes the other one of luminance attenuation and luminance increase.
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Abstract
A display is backlit by a source having spatially modulated luminance to attenuate illumination of dark areas of images and increase the dynamic range of the display.
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Citations
43 Claims
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1. A backlit display, comprising:
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a backlight to output light at a controllable luminance level; and a light valve to control, per pixel, transmittance of light from said backlight to create an image, wherein in each of a plurality of areas that constitute at least part of said image, luminance of said backlight is controllable in a first manner based upon a first determined brightness property value relating to brightness of said image to be displayed in said each area, and wherein control of said luminance of said backlight is switchable to control in a second manner, different from said control performed in the first manner, based upon a second determined brightness property value relating to brightness of said image to be displayed in said each area, the second brightness property being different from the first brightness property, wherein control in the first manner includes one of luminance attenuation and luminance increase and control in the second manner includes the other one of luminance attenuation and luminance increase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A display for displaying an image by controlling luminance per pixel, wherein in each of a plurality of areas that constitute at least part of said image,
said image to be displayed is controllable in a first manner based upon a first determined brightness property value regarding brightness of said image to be displayed in said each area, and control of said image to be displayed is switchable to control in a second manner, different from said control in the first manner, based upon with a second determined brightness property value regarding said brightness of said image to be displayed in said each area, the second brightness property being different from the first brightness property, wherein control in the first manner includes one of luminance attenuation and luminance increase and control in the second manner includes the other one of luminance attenuation and luminance increase.
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26. An image display method of controlling, per pixel, transmittance of light from a backlight to create an image, the method comprising:
controlling luminance of said backlight based upon a result of a judgment, performed for each of a plurality of areas that constitute said image, of whether luminance of said backlight is to be controlled by a first method or a second method, different from the first method, the first method controlling said luminance of said backlight based upon a determined first brightness property value regarding brightness of said image to be displayed in said each area, and the second method controlling said luminance of said backlight based upon a determined second brightness property value regarding brightness of said image to be displayed in said each area, the second brightness property being different from the first brightness property, wherein control in the first method includes one of luminance attenuation and luminance increase and control in the second method includes the other one of luminance attenuation and luminance increase. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. An image display method of controlling, per pixel, transmittance of light from a backlight in order to create an image, the method comprising:
controlling luminance of said backlight by changing between control by a first method and control by a second method, the first method controlling said luminance of said backlight based upon a determined first brightness property value regarding brightness of said image to be displayed, and the second method being different from the first method, wherein said backlight is usable to output light at a spatially modulatable luminance, wherein control in the first method includes one of luminance attenuation and luminance increase and control in the second method includes the other one of luminance attenuation and luminance increase. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43)
Specification