LCD Transmittance Correction via Aperture Ratio Adjustment
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in accurately displaying images at theoretical luminance corresponding to input grayscale values due to deviations in actual transmittance from theoretical transmittance, leading to insufficient luminance of picture elements.
Innovation Solution
An image processing device is introduced that includes a second panel data correction unit and a first panel data generation unit, which adjust the aperture ratios of pixels and picture elements based on input image data and luminance distribution data to align actual transmittance with theoretical transmittance, ensuring accurate luminance display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the aperture ratio of pixels and picture elements is controlled based on theoretical transmittance values, then the display system achieves simple control and theoretical luminance accuracy, but the actual transmittance deviates from theoretical transmittance causing luminance inaccuracies
Solution Approach 1:
The patent applies preliminary action by measuring and storing the actual transmittance characteristics of each pixel and picture element before normal operation. The image processing device creates lookup tables containing correction data that compensate for manufacturing variations, allowing the system to pre-correct aperture ratio control values based on these stored characteristics rather than relying solely on theoretical transmittance values.
Solution Approach 2:
The patent implements feedback by using measured actual transmittance values to generate correction data that is fed back into the aperture ratio control process. The image processing device continuously references the stored actual transmittance characteristics when calculating drive signals, ensuring that control decisions are based on real performance data rather than theoretical models.
2Measurement precision
If the actual transmittance is corrected for each pixel and picture element, then luminance accuracy improves, but the device complexity increases due to additional correction units and data processing
Solution Approach 1:
The patent reduces operational complexity by performing the complex measurement and correction data generation as a preliminary action during manufacturing or initial setup. The actual transmittance characteristics are measured and stored in lookup tables before normal display operation begins, so that during regular operation the system only needs to reference pre-computed correction data rather than performing complex real-time calculations.
Solution Approach 2:
The patent uses copying by creating lookup tables that store correction data for each pixel and picture element. Instead of performing complex individual corrections for every element during operation, the system copies reference correction data from the lookup tables and applies these pre-computed values to simplify the real-time control process while maintaining accuracy.
3Measurement precision
If lookup tables with correction data are generated and stored, then transmittance accuracy improves, but the memory requirements and data processing load increase
Solution Approach 1:
The patent applies local quality by generating and storing correction data specifically for each individual pixel and picture element based on its unique actual transmittance characteristics. Rather than using a single global correction factor, the system creates localized correction data tailored to each display element's specific performance, allowing for precise compensation of manufacturing variations while managing data volume through targeted rather than universal correction.
Data Source
AI summary
In an image processing device, for each of one or two or more picture elements among a plurality of picture elements, the one or two or more picture elements having an input grayscale value included in the input image data being equal to or less than a first predetermined value, the second panel data correction unit corrects the second aperture ratio of each of at least one pixel among the plurality of pixels, the at least one pixel facing the one or two or more picture elements, so that an actual transmittance gets closer to a theoretical transmittance, and the first panel data generation unit generates the first aperture ratio for each of the plurality of picture elements by dividing a normalized input grayscale value included in the input image data by a normalized luminance included in the panel luminance distribution data.