Backlight Luminance Control Using Switchable Attenuation Profiles
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Solution Overview
Problem
Existing display technologies face a trade-off between reducing halo effects and maintaining optimal luminance, as adjusting light sources to minimize halo often compromises display brightness.
Innovation Solution
A circuit apparatus that includes a storage unit and a light source luminance determination circuit, which uses different attenuation factor distributions based on input image data to optimize light source luminance in various modes, balancing halo reduction and luminance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the luminance of light-emitting elements is reduced to minimize halo effects, then halo artifacts are reduced, but the luminance available for illuminating the display panel is compromised
Solution Approach 1:
The patent applies local quality by using multiple attenuation factor distributions corresponding to different regions or viewing conditions. Each distribution optimizes the trade-off between halo reduction and luminance maintenance for its specific context, allowing different parts of the display system to operate with different light attenuation characteristics based on local requirements
Solution Approach 2:
The patent implements dynamics by enabling switching between multiple attenuation factor distributions based on display mode or viewing conditions. This allows the system to dynamically adjust the attenuation characteristics to optimize both halo reduction and luminance maintenance for different operating scenarios, rather than using a fixed attenuation profile
2Object-affected harmful factors
If a fixed attenuation factor is used to reduce halo, then halo artifacts are minimized, but light adjustment cannot be optimized for different display contents or environments
Solution Approach 1:
The patent applies universality by providing multiple attenuation factor distributions that can serve different display modes and viewing conditions. This multi-functional approach allows the same light-emitting element to be optimized for different purposes (e.g., wide viewing angle mode versus high brightness mode) by selecting the appropriate attenuation distribution, making the system universally adaptable to various requirements
Data Source
AI summary
A circuit apparatus includes a storage unit and a light source luminance determination circuit. The storage unit stores a plurality of pieces of attenuation factor distribution information indicating an attenuation factor distribution of light with respect to a distance between a light source element and a pixel. The light source luminance determination circuit determines, by light adjustment processing based on input image data and the plurality of pieces of attenuation factor distribution information, light source luminance information indicating luminance of light emitted by each light source element of a plurality of light source elements. In a first mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and first attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information. In a second mode, the light source luminance determination circuit determines the light source luminance information based on the input image data and second attenuation factor distribution information in which the attenuation factor distribution is different from that in the first attenuation factor distribution information among the plurality of pieces of attenuation factor distribution information.