Optimal backlighting determination apparatus and method
First Claim
1. A method of calculating a first backlight driving level and a second backlight driving level, for a color display for displaying pictures with a color gamut spanned by a number of color primaries having a backlight, the method comprising the acts of:
- controlling the backlight to produce a first amount of light with a first backlight spectrum in accordance with the first backlight driving level and a second amount of light with a second backlight spectrum in accordance with the second backlight driving level;
outputting a first color primary light output and a second color primary light output by the color display having a first light transmission valve and a second light transmission valve plus a color filter combination formed from the first backlight spectrum and the second backlight spectrum, respectively, wherein a chromaticity of at least one of the color primaries depends on the first backlight driving level and the second backlight driving level;
determining an input picture color gamut of at least a part of a picture to be displayed;
scaling the determined input picture color gamut to form a scaled picture color gamut by changing valve drive levels of the first light transmission valve and the second light transmission valve, wherein a desired color is outside the scaled picture color gamut;
determining the first backlight driving level and the second backlight driving level for matching a color gamut realizable by the color display with the first backlight driving level and the second backlight driving level to the determined input picture color gamut; and
transforming the scaled picture color gamut to a converted picture color gamut by driving the backlight with the determined first backlight driving level and the determined second backlight driving level, wherein the desired color is inside the transformed picture color gamut.
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Accused Products
Abstract
To have an optimal use of a display for displaying particular, e.g. chromatically biased, image content, described is a method of calculating an optimal first and second backlight driving level, for a color display having a backlight which can be controlled to produce a first amount of light with a first spectrum in accordance with the first backlight driving level and a second amount of light with a second spectrum in accordance with the second backlight driving level, and the color display having a first and second light transmission valve plus color filter combination, arranged to create from the backlight spectra a respective first and second color primary light output, the chromaticity of at least one of the color primaries depending on the first and second backlight driving level, wherein the first and second backlight driving levels are determined so that a gamut of at least a part of a picture to be displayed is optimally covered by the gamut realizable by the display with the first and second backlight driving level.
20 Citations
12 Claims
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1. A method of calculating a first backlight driving level and a second backlight driving level, for a color display for displaying pictures with a color gamut spanned by a number of color primaries having a backlight, the method comprising the acts of:
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controlling the backlight to produce a first amount of light with a first backlight spectrum in accordance with the first backlight driving level and a second amount of light with a second backlight spectrum in accordance with the second backlight driving level; outputting a first color primary light output and a second color primary light output by the color display having a first light transmission valve and a second light transmission valve plus a color filter combination formed from the first backlight spectrum and the second backlight spectrum, respectively, wherein a chromaticity of at least one of the color primaries depends on the first backlight driving level and the second backlight driving level; determining an input picture color gamut of at least a part of a picture to be displayed; scaling the determined input picture color gamut to form a scaled picture color gamut by changing valve drive levels of the first light transmission valve and the second light transmission valve, wherein a desired color is outside the scaled picture color gamut; determining the first backlight driving level and the second backlight driving level for matching a color gamut realizable by the color display with the first backlight driving level and the second backlight driving level to the determined input picture color gamut; and transforming the scaled picture color gamut to a converted picture color gamut by driving the backlight with the determined first backlight driving level and the determined second backlight driving level, wherein the desired color is inside the transformed picture color gamut. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A backlight driving calculation unit for calculating a first backlight driving level and a second backlight driving level, for a color display for displaying pictures with a color gamut spanned by a number of color primaries having a backlight which can be controlled to produce a first amount of light with a first backlight spectrum in accordance with the first backlight driving level and a second amount of light with a second backlight spectrum in accordance with the second backlight driving level, and the color display having a first light transmission valve and a second light transmission valve plus a color filter combination configured to create from the first backlight spectrum and the second backlight spectrum a first color primary light output and a second color primary light output, respectively, wherein a chromaticity of at least one of the color primaries depends on the first backlight driving level and the second backlight driving level, the backlight driving calculation unit comprising:
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an input gamut determination unit configured to determine an input picture color gamut of at least a part of a picture to be displayed; and an optimization unit configured to; scale the determined input picture color gamut to form a scaled picture color gamut by changing valve drive levels of the first light transmission valve and the second light transmission valve, wherein a desired color is outside the scaled picture color gamut; determine the first backlight driving level and the second backlight driving level so that the input picture color gamut is matched by the gamut realizable by the color display with the first backlight driving level and the second backlight driving level; and transform the scaled picture color gamut to a converted picture color gamut by driving the backlight with the determined first backlight driving level and the determined second backlight driving level, wherein the desired color is inside the transformed picture color gamut. - View Dependent Claims (11, 12)
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Specification