Color Conversion Device Selective Gamut Mapping for Display Power
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Solution Overview
Problem
Conventional liquid crystal display devices reduce image saturation to conserve backlight power, leading to visual quality deterioration, especially for memory colors like human flesh and sky blue, as they reduce the saturation of all colors rather than selectively managing light allocation.
Innovation Solution
A color conversion device and method that processes input signals to maintain or adjust colors within a defined color gamut by generating in-defined-gamut data, ensuring that colors outside the gamut are converted to the gamut border or inside without changing hue, and allocating more light to the white sub-pixel for reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the saturation of all colors is reduced to increase light transmission to the white pixel, then power consumption is reduced, but visual quality deteriorates especially for memory colors
Solution Approach 1:
The patent applies local quality by selectively converting only out-of-gamut colors to in-gamut colors while leaving in-gamut colors unchanged. This selective approach allows the white pixel to receive more light transmission for power savings, while preserving the visual quality of colors that are already within the acceptable gamut range, particularly memory colors like flesh tones and sky blue that are sensitive to saturation changes.
2Manufacturing precision
If colors outside the defined color gamut are converted to in-gamut colors, then color accuracy is improved, but the saturation of all colors may be reduced
Solution Approach 1:
The patent implements local quality by applying color conversion only to pixels whose colors fall outside the defined color gamut, while leaving pixels with in-gamut colors unchanged. This selective conversion strategy ensures that color accuracy is improved for out-of-gamut colors without unnecessarily reducing the saturation of already-valid colors, thereby minimizing information loss.
3Use of energy by stationary object
If the transmission amount of light to the white pixel is increased, then power consumption is reduced, but the saturation and visual quality of the displayed image deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying local quality through selective color conversion. By converting only out-of-gamut colors to in-gamut colors, the system enables increased light transmission to the white pixel for power savings, while preserving the saturation and visual quality of in-gamut colors that would otherwise be degraded by universal saturation reduction.
Data Source
AI summary
According to an aspect, a color conversion device includes a signal processing unit and a signal output unit. When a color specified in a predetermined color space by color data based on input signals is a color outside a defined color gamut defined in the color space, the signal processing unit generates in-defined-gamut data, and when the color specified in the color space by the color data based on the input signals is a color on a border of or inside the defined color gamut, the signal processing unit does not convert the color data based on the input signals into color data of a color different from that specified by the color data based on the input signals, and generates in-defined-gamut data identical to the color data based on the input signals, and. The signal processing unit generates output signals based on the in-defined-gamut data.