Digital Gamma Correction for LCD Tact Time Reduction
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Solution Overview
Problem
Existing digital gamma correction methods for liquid crystal display (LCD) devices face challenges in reducing tact time while maintaining accurate gamma correction, as they either require increasing the number of detection gray levels to achieve high accuracy, leading to increased tact time, or reducing gray levels results in irregular output voltage characteristics and brightness degradation.
Innovation Solution
A digital gamma correction system and method that uses a non-linear interpolation scheme to estimate and recover original data values by setting the number of detection gray levels, employing brightness detectors, a controller, non-linear interpolation data processor, and a memory to generate gamma correction data, allowing for reduced detection gray levels in areas with small brightness variation and increased levels in areas with large variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of detection gray levels is increased to achieve high gamma correction accuracy, then measurement precision is improved, but tact time increases
Solution Approach 1:
The patent applies local quality by differentiating the number of detection gray levels across different brightness ranges. In the mid-tone range where gamma correction is most critical, the system uses a higher number of detection gray levels to ensure accurate correction. In contrast, for shadow and highlight ranges where the human eye is less sensitive, the system uses fewer detection gray levels, thereby reducing overall tact time while maintaining correction accuracy where it matters most.
Solution Approach 2:
The patent segments the gamma correction process into multiple brightness ranges (shadow, mid-tone, highlight) and applies different detection strategies to each segment. This segmentation allows the system to optimize the balance between measurement precision and tact time for each range independently, rather than using a uniform approach across all brightness levels.
2Productivity
If the number of detection gray levels is reduced to decrease tact time, then productivity is improved, but measurement precision deteriorates and brightness degradation occurs
Solution Approach 1:
The patent applies local quality by concentrating measurement resources on the mid-tone range where gamma correction is most critical and the human eye is most sensitive. By using fewer detection gray levels in shadow and highlight ranges, the system reduces overall tact time while maintaining sufficient accuracy in the critical mid-tone region, thus improving productivity without significantly compromising measurement precision where it matters.
Solution Approach 2:
The patent applies partial action by performing detailed brightness measurements only for the mid-tone range rather than uniformly across all brightness levels. This partial measurement approach reduces the total number of detection steps and consequently decreases tact time, while still providing sufficient correction data for the most visually important portion of the image spectrum.
3Productivity
If linear interpolation is used to reduce computation time, then productivity is improved, but manufacturing precision deteriorates due to irregular output voltage characteristics
Solution Approach 1:
The patent applies dynamics by switching between different interpolation methods based on the brightness range. For the mid-tone range, the system uses non-linear interpolation to accurately capture the gamma characteristics and maintain correction precision. For shadow and highlight ranges, the system uses linear interpolation to reduce computational complexity and increase processing speed, thus dynamically optimizing the balance between precision and productivity across different operating conditions.
Data Source
AI summary
A digital gamma correction system for detecting a brightness of a liquid crystal panel, and correcting a gamma voltage, based on the detected brightness, includes an offset setter for setting the number of detection gray levels and a first detection area, for the detection of the brightness of the liquid crystal panel, a plurality of brightness detectors for detecting brightness values output from the first detection area for the detection gray levels, a controller for processing the brightness values detected by the brightness detectors, a non-linear interpolation data processor for processing a brightness value supplied from the controller, thereby generating non-linear interpolation data as a brightness variation rate according to the gray levels, a brightness corrector for generating gamma correction data for brightness values obtained by interpolating brightness values detected in a second detection area of another liquid crystal panel for a second number of detection gray levels, based on the non-linear interpolation data, and a memory for storing the gamma correction data generated from the brightness corrector.