Display Luminance Control Circuit for Symmetrical Local Dimming
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Solution Overview
Problem
Existing display technologies face issues with luminance imbalance in display objects due to asymmetrical light-emission intensity, leading to poor brightness symmetry, particularly in left-right and up-down directions, which affects the display quality.
Innovation Solution
A circuit device with a storage unit and light source luminance determination circuit that determines light source luminance based on attenuation rate distribution information, using low-resolution image data to balance luminance by averaging light-emission intensity across light source elements, reducing bias through directional scanning and averaging processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If luminance of light-emitting elements is increased for bright portions of images in local dimming, then light emission intensity is improved, but luminance balance between left and right sides becomes poor
Solution Approach 1:
The patent applies asymmetry principle by intentionally introducing artificial asymmetry in the form of dummy pixels with opposite polarity to counterbalance the inherent asymmetry in light emission. By adding dummy pixels with opposite polarity to the brighter side, the system creates a counterbalancing effect that restores overall luminance symmetry, transforming the asymmetric light emission problem into a balanced state through controlled asymmetric compensation.
2Illumination intensity
If luminance of light-emitting elements is increased for bright portions of images in local dimming, then light emission intensity is improved, but brightness symmetry in up and down directions becomes poor
Solution Approach 1:
The patent applies asymmetry principle in vertical direction by introducing dummy pixels with opposite polarity to compensate for asymmetric light emission in up and down directions. This creates a counterbalancing effect that restores vertical luminance symmetry, allowing the system to maintain brightness symmetry while preserving the light emission enhancement benefits of local dimming.
3Illumination intensity
If light emission intensity is adjusted for each control area, then display brightness is improved, but luminance balance between control areas becomes poor
Solution Approach 1:
The patent applies local quality principle by introducing compensation pixels with opposite polarity in specific control areas where luminance imbalance occurs. Instead of uniformly adjusting all control areas, the system selectively applies dummy pixel compensation to specific regions with asymmetric light emission characteristics, maintaining local luminance balance while preserving the local dimming brightness enhancement where needed.
Data Source
AI summary
A circuit device includes a storage unit and a light source luminance determination circuit. The storage unit stores attenuation rate distribution information indicating an attenuation rate distribution of light with respect to a distance between a light source element and a pixel. The light source luminance determination circuit determines light source luminance information indicating luminance of light emitted by each of the plurality of light source elements, based on the attenuation rate distribution information. The circuit determines luminance based on a target pixel value when a selected pixel position is moved in opposite directions on a line. The selected pixel position is a pixel in first image data input to the circuit.