RGBW Display Device Power Reduction via Color Conversion
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Solution Overview
Problem
Conventional liquid-crystal display devices that reduce both saturation and luminance of images to conserve power degrade display quality, necessitating a solution that reduces power consumption without compromising image quality.
Innovation Solution
A display device with a two-dimensional matrix of pixels including red, green, blue, and white sub-pixels, a signal processing unit for color conversion and light control, and a planar light-source device that emits white light, allowing for efficient light allocation and reduced power consumption while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If saturation and luminance reduction processing is performed on pixel data to reduce power consumption, then power consumption is reduced, but display quality is degraded
Solution Approach 1:
The display pixel is divided into four sub-pixels (R, G, B, W) that can be independently controlled. This segmentation allows selective activation of sub-pixels based on image content, enabling power reduction in non-essential sub-pixels while maintaining display quality in essential areas.
Solution Approach 2:
Different processing strategies are applied to different regions of the image based on local characteristics. The saturation-luminance reduction ratio is calculated according to each pixel's requirements, allowing quality preservation in critical areas while achieving power savings in less critical areas.
2Use of energy by moving object
If the transmission amount of light from backlight is allocated to pixel W based on RGB data, then luminance of backlight is reduced and power consumption is reduced, but image quality degradation occurs
Solution Approach 1:
The patent dynamically adjusts the saturation-luminance reduction ratio as a controllable parameter. By optimizing this ratio based on image characteristics and display requirements, the system achieves power consumption reduction while maintaining acceptable image quality through parameter optimization rather than fixed reduction.
Data Source
AI summary
According to an aspect, a display device includes: an image display panel; a color conversion device including a signal processing unit and a signal output unit; a planar light-source device; and a light-source-device control unit. The signal processing unit includes a color conversion circuit that converts an input signal in a reference color area into a converted input signal generated in a definition color area where a chromaticity point of at least one of a first color, a second color, and a third color is inside of a reference color area, and a four-color generation circuit that generates an output signal and a light-source-device control signal from the converted input signal. The signal output unit outputs the drive signal to each sub-pixel based on the output signal. The light-source-device control unit outputs a drive voltage for emitting white light on the planar light-source device based on the light-source-device control signal.