Display Panel Grayscale Correction for Pixel Unevenness
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Solution Overview
Problem
Higher-resolution display apparatuses are susceptible to variations in transistor and display element characteristics, leading to noticeable display unevenness and quality degradation.
Innovation Solution
A method and system for acquiring imaging data at multiple grayscales, generating correction data based on these data, and using a correction circuit to improve image quality, including addressing point defects in pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher-resolution display panels are used, then display definition is improved, but susceptibility to variation in transistor and display element characteristics increases
Solution Approach 1:
The patent applies preliminary action by measuring and storing correction data for each pixel before actual display operation. The system captures imaging data at multiple grayscales, calculates correction values to compensate for manufacturing variations, and stores these correction data in memory. When displaying images, the correction circuit automatically applies these pre-calculated corrections, eliminating the need for real-time adjustment and ensuring uniform display quality across high-resolution panels.
2Measurement precision
If the number of pixels is increased, then resolution is improved, but display unevenness becomes more noticeable
Solution Approach 1:
The patent implements local quality by applying individualized correction data to each pixel based on its specific characteristics. The system measures imaging data from each pixel at multiple grayscales and calculates unique correction values stored in correction data with address information. The correction circuit then applies these localized corrections pixel-by-pixel, allowing each element to be optimized independently rather than applying uniform correction across the entire display, thereby addressing manufacturing variations in high-resolution panels.
3Manufacturing precision
If correction data is generated for all pixels at multiple grayscales, then display quality is improved, but data processing complexity increases
Solution Approach 1:
The system performs the complex data processing work in advance by measuring and calculating correction data for all pixels at multiple grayscales before actual display operation. This preliminary action transfers the computational burden to the manufacturing/initialization phase, allowing the correction data to be stored in memory and applied automatically during normal operation without real-time processing complexity.
Solution Approach 2:
The patent uses copying by creating a digital correction data set that mirrors the physical pixel characteristics. Instead of physically adjusting each pixel or performing complex real-time calculations, the system creates a digital copy of the correction information in memory that can be rapidly accessed and applied by the correction circuit, simplifying the processing complexity during actual display operation.
Data Source
AI summary
A correction method of a display apparatus is provided. A method for evaluating display quality of a display apparatus is provided. The display apparatus includes a display panel, a correction circuit, and a memory. First, first imaging data including all pixels in the display apparatus is acquired in a state where an image with a first grayscale is displayed on the display apparatus. Then, second imaging data including all the pixels in the display apparatus is acquired in a state where an image with a second grayscale is displayed on the display apparatus. Next, correction data is generated based on the first imaging data and the second imaging data. After that, the correction data is output to the memory of the display apparatus. The correction circuit has a function of correcting image data based on the correction data stored in the memory to generate corrected image data and outputting the corrected image data to the display panel.