Backlit display with improved dynamic range
First Claim
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1. A method of increasing a dynamic range of a backlit display, said method comprising the step of varying a luminance of a light source illuminating a displayed pixel in response to an intensity value of said pixel.
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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
22 Claims
- 1. A method of increasing a dynamic range of a backlit display, said method comprising the step of varying a luminance of a light source illuminating a displayed pixel in response to an intensity value of said pixel.
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15. A method of increasing the dynamic range of a backlit display, said method comprising the steps of:
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(a) determining a luminance of a pixel of an image from a data value for said pixel;
(b) filtering said luminance;
(c) determining a maximum of said filtered luminance for a plurality of pixels illuminated by a light element of a backlight;
(d) determining a statistical value of said filtered luminance for a plurality of pixels illuminated said light element; and
(e) illuminating said light element according to a relationship of said maximum of said filtered luminance and said statistical value of said filtered luminance. - View Dependent Claims (16, 17, 18)
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19. A backlit display comprising:
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(a) a plurality of light source elements;
(b) a light valve arranged for locally modulated transmittance of light from said light source elements, said locally modulated transmittance being responsive to a data value of an image pixel; and
(c) a light source controller to modulate a luminance output of a light source element according to a relationship of said luminance output and said data value of said image pixel. - View Dependent Claims (20)
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- 21. A backlight for a display comprising a plurality of light sources, at least one light source being controllable to output light at a luminance level independent of a luminance level of light output by another of said light sources.
Specification