RGBW Display Backlight Control for Energy and Quality
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Solution Overview
Problem
RGBW LCD panels face issues with image quality due to higher power consumption and brightness inconsistencies, as they have lower power consumption but reduced light penetration, leading to darker single-colored images and overly bright white images, which shortens battery life in portable devices.
Innovation Solution
A method for controlling a display that transforms RGB data values into brightness values, adjusts them based on a human factor to maintain image quality, and dynamically adjusts backlight strength using a mapping ratio and threshold calculations to optimize energy use while preserving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If RGBW LCD panels are used to reduce power consumption, then energy efficiency is improved, but image quality deteriorates due to darker single-colored images and overly bright white images
Solution Approach 1:
The patent applies dynamic control by adjusting the backlight unit brightness based on the display content type. The controller determines whether to display in full-color mode or grayscale mode and dynamically adjusts the backlight brightness accordingly - reducing brightness for grayscale content and maintaining normal brightness for full-color content, thus resolving the image quality issue while preserving energy savings
Solution Approach 2:
The patent changes the backlight brightness parameter dynamically based on the display mode. When grayscale display is detected, the backlight brightness is reduced to a lower level; when full-color display is needed, the backlight brightness is maintained at normal level. This parameter adjustment resolves the contradiction between power consumption and image quality
2Illumination intensity
If white subpixels are introduced into RGBW LCD panels to increase light penetration rate, then energy efficiency is improved, but brightness consistency deteriorates causing darker single-colored images and overly bright white images
Solution Approach 1:
The patent implements a feedback mechanism where the controller detects the display content type (grayscale or full-color) and adjusts the backlight brightness accordingly. This feedback loop ensures that the white subpixels' high light penetration rate is utilized effectively for grayscale content while preventing excessive brightness in full-color content, thus maintaining brightness consistency
3Illumination intensity
If a multi-wavelength backlight module is used in wide colour gamut LCD panels to achieve desired brightness, then color gamut is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by using the multi-wavelength backlight module at reduced power for grayscale content display. Since grayscale content requires less color information, the full power of the multi-wavelength backlight is not needed, thus reducing power consumption while maintaining adequate brightness for the display requirements
Data Source
AI summary
A method for controlling a display is provided. An RGB video signal is transformed into an RGBW video signal based on a human factor. The display has a plurality of pixels configured to display images according to the RGBW video signal, where each of the pixels has a red subpixel, a green subpixel, a blue subpixel and a white subpixel. According to the method, when brightness of a backlight module of the display is reduced to decrease energy consumption of the display, quality of the images of the display observed by users is still maintained within an acceptable range.