RGBW Display Brightness Control Module for Contrast Management
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Solution Overview
Problem
Conventional RGBW liquid crystal display devices experience undesirable contrast effects due to the diminished brightness enhancement effect of white color elements on saturated colors, leading to dark appearance of colors like yellow, orange, and red when displayed with peak white or desaturated colors.
Innovation Solution
A processing module that determines a set of gray level signals for a liquid crystal display module, using a scale value control member, brightness control member, and scaler to adjust brightness based on requested brightness, baseline brightness, and hue-dependent factors, minimizing contrast effects by scaling down brightness when saturated and desaturated colors coexist.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white color elements are used in RGBW display devices to enhance brightness, then brightness of white and desaturated colors is improved, but contrast effects deteriorate when saturated colors are displayed simultaneously with peak white
Solution Approach 1:
The patent applies local quality by differentiating brightness enhancement treatment based on color saturation. White and desaturated color components receive full brightness enhancement from white color elements, while saturated color components have their brightness enhancement selectively reduced. This localized differentiation resolves the contrast problem by preventing saturated colors from appearing dark against bright white backgrounds, while preserving the brightness benefit for white and desaturated colors.
2Illumination intensity
If brightness enhancement is applied uniformly to all image components, then overall brightness is improved, but saturated colors appear dark when viewed with peak white
Solution Approach 1:
The patent changes the brightness enhancement parameter dynamically based on the saturation level of each image component. By adjusting the enhancement parameter according to saturation, the system maintains color accuracy for saturated colors while preserving brightness enhancement for white and desaturated colors. This parameter adaptation resolves the reliability issue without sacrificing overall brightness improvement.
3Use of energy by moving object
If white color elements are used to save energy in backlight modules, then energy consumption is reduced, but brightness enhancement effect diminishes for saturated colors
Solution Approach 1:
The patent applies partial brightness enhancement selectively to non-saturated color components while limiting or eliminating enhancement for saturated colors. This partial action approach maintains energy efficiency benefits of white color elements for the majority of image content (white and desaturated colors), while accepting reduced brightness enhancement for saturated colors to avoid energy waste and contrast problems. The energy-saving benefit is preserved for the predominant non-saturated content.
Data Source
AI summary
A module processes image data to provide gray level signals to be used for displaying an image. The module may include a scale value control member for determining a first scale value. The module may further include a brightness control member for determining a controlled brightness value using a requested brightness value, a brightness control parameter, and a baseline brightness value. The module may further include a modification member for determining a modified scale value using the first scale value and the controlled brightness value. The module may further include a scaler for generating the gray level signals using the image data and at least one of the modified scale value and a damped scale value, the damped scale value being determined using the modified scale value. The module may further include hardware circuitry for implementing at least one of the aforementioned components.