Backlight Luminance Circuit Using Position-Specific Lookup Tables
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Solution Overview
Problem
Existing display technologies fail to accurately account for differences in light diffusion patterns due to varying peripheral structures of light sources, leading to inaccurate luminance calculation at each pixel, which affects color correction.
Innovation Solution
A circuit device that includes a luminance information calculation circuit to determine accurate luminance values by using lookup tables that consider the position-specific attenuation rates of light source elements, allowing for precise luminance and color correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lookup table is used for all light source elements, then the device complexity is reduced, but the luminance calculation precision deteriorates due to individual differences in attenuation characteristics
Solution Approach 1:
The patent divides the single lookup table into multiple individual lookup tables, with each light source element having its own dedicated lookup table that stores attenuation rate distribution specific to that element. This segmentation allows precise representation of individual characteristics while maintaining manageable complexity through systematic organization.
Solution Approach 2:
Each light source element is assigned a unique lookup table that captures its specific attenuation characteristics. This local quality approach ensures that each element's individual properties are preserved and utilized in luminance calculations, improving overall precision without requiring a completely complex system.
2Measurement precision
If individual lookup tables are created for each light source element, then the luminance calculation precision is improved, but the device complexity increases due to multiple lookup tables
Solution Approach 1:
The luminance information calculation circuit is designed to handle multiple lookup tables through a unified processing mechanism. The circuit obtains attenuation rates from respective lookup tables and performs composite luminance calculations, demonstrating multi-functionality that manages individualized data without proportionally increasing complexity.
3Measurement precision
If attenuation rates are measured individually for each light source element, then the luminance information accuracy is improved, but the manufacturing time increases
Solution Approach 1:
The attenuation rate distributions for all light source elements are measured and stored in their respective lookup tables before the display device is put into service. This preliminary action captures individual characteristics in advance, allowing rapid luminance calculations during operation without time-consuming real-time measurements.
4Speed
If a single luminance model is used for all light source elements, then the processing speed is improved, but the luminance information accuracy deteriorates due to individual characteristics
Solution Approach 1:
The unified luminance model is segmented into multiple individual models, with each light source element having its own luminance calculation process that references its specific lookup table. This segmentation maintains calculation speed through efficient individual processing while improving accuracy by accounting for individual characteristics.
Data Source
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AI summary
A circuit device includes a storage unit configured to store a plurality of lookup tables, and a luminance information calculation circuit configured to calculate luminance information indicating a luminance of light reaching a target pixel of a display panel from a backlight. The first lookup table is associated with a first light source element provided at a first position, and indicates a first attenuation rate distribution of the first light source element. The second lookup table is associated with a second light source element provided at a second position, and indicates a second attenuation rate distribution of the second light source element. The luminance information calculation circuit obtains a first attenuation rate of light reaching the target pixel from the first light source element based on the first lookup table, obtains a second attenuation rate of light reaching the target pixel from the second light source element based on the second lookup table, and calculates the luminance information based on the first attenuation rate and the second attenuation rate.