RGBW Display Brightness Control via Saturation Dimming
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Solution Overview
Problem
RGBW display panels exhibit lower brightness compared to RGB panels when displaying pure color images due to their lower aperture ratio, resulting in a darker display effect.
Innovation Solution
A method and device that adjust the backlight brightness of RGBW display panels by calculating and combining saturation and area dimming signals to control the duty ratio of the light emitting component, enhancing the brightness of pure color images through a controller and driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If RGBW technology is used to reduce power consumption, then energy efficiency is improved, but brightness of pure color images deteriorates
Solution Approach 1:
The patent applies local quality by implementing area dimming that divides the display into multiple zones with different brightness levels. Different regions of the screen can have different backlight intensities, allowing bright areas to maintain high luminance while dark areas consume less power, thus resolving the contradiction between overall power consumption and local brightness requirements.
Solution Approach 2:
The patent implements dynamic brightness adjustment by continuously analyzing image content and adapting backlight intensity in real-time. The system dynamically determines which areas need high brightness and which can be dimmed, creating a dynamic balance between power consumption and brightness performance based on actual display requirements.
2Use of energy by moving object
If area dimming is applied to reduce power consumption, then energy efficiency is improved, but uniformity of brightness distribution deteriorates
Solution Approach 1:
The patent resolves this contradiction by intentionally creating non-uniform brightness distribution through area dimming, where different regions have optimized brightness levels suited to their content requirements. This local optimization improves overall power efficiency while maintaining visual comfort through gradual transitions between zones.
Solution Approach 2:
The patent applies preliminary action by pre-processing the image to identify important regions and determine optimal brightness distribution before actual display. This advance planning ensures that brightness uniformity is maintained in critical areas while allowing power savings in less important regions.
3Illumination intensity
If saturation dimming is applied to enhance pure color brightness, then display quality is improved, but complexity of control increases
Solution Approach 1:
The patent resolves this contradiction by changing control parameters from simple on/off switching to multi-level dimming control based on saturation values. By adjusting the dimming level according to the saturation of displayed colors, the system enhances pure color brightness while using standardized signal processing techniques that keep implementation complexity manageable.
Solution Approach 2:
The patent implements feedback by continuously monitoring the saturation of displayed content and using this information to dynamically adjust backlight intensity. This closed-loop control automatically adapts to different image content, improving pure color brightness without requiring complex manual intervention or predetermined settings.
Data Source
AI summary
Disclosed are a method and a device for controlling brightness of a display device, and a liquid crystal display. In the method, a saturation signal and an area dimming signal of each of partitioned screens of the display panel are acquired, and a saturation dimming signal of each of partitioned screens of the display panel is calculated according to the saturation signal, for adjusting the backlight brightness.