Display Panel Luminance Correction via Gray Level Lookup Table
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Solution Overview
Problem
Display panels often suffer from defects such as stains due to differences in exposure during the manufacturing process, leading to variations in luminance and parasitic capacitance, which cannot be fully corrected by existing repair methods.
Innovation Solution
A system and method that includes a signal supplier, luminance calculator, and correction data calculator to capture images at different reference gray levels, calculate luminance distribution data, and generate correction data to adjust the luminance of pixels, ensuring uniformity by setting a reference pixel and applying correction data to other pixels to match its luminance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple exposures are used in the manufacturing process, then thin-film patterns can be formed, but exposure differences cause luminance non-uniformity and defects
Solution Approach 1:
The patent applies preliminary action by measuring and storing correction data for each pixel before actual display operation. The system captures luminance values at multiple gray levels, calculates correction values, and stores them in a correction lookup table (LUT) in advance, so that luminance non-uniformity caused by manufacturing variations can be compensated during normal operation without affecting the manufacturing process itself.
Solution Approach 2:
The patent changes the parameter of gray level data by applying correction values from the LUT. The correction data calculator modifies the input gray level values for each pixel based on stored correction data, effectively adjusting the luminance output to compensate for manufacturing-induced non-uniformity without physically altering the display panel structure.
2Length of moving object
If the gap between display panel and backlight unit is reduced, then display thickness is decreased, but light diffusion path is reduced causing horizontal line defects
Solution Approach 1:
The patent replaces the mechanical/optical solution of increasing the gap between display panel and backlight unit with a digital correction system. Instead of physically increasing the light diffusion path, the system uses software-based luminance correction to compensate for the reduced light diffusion effect, thereby maintaining uniform display quality while keeping the display thin.
3Ease of repair
If repair processes are applied to defective display panels, then some defects can be corrected, but certain stains and luminance non-uniformity cannot be fully corrected
Solution Approach 1:
The patent enables the display system to self-correct luminance non-uniformity and stain defects through automated measurement and correction. The system independently captures luminance data, calculates correction values, stores them in an LUT, and applies corrections during operation without requiring external repair intervention, thereby achieving complete correction of defects that traditional repair methods cannot address.
4Illumination intensity
If correction data is calculated for all pixels, then luminance uniformity is improved, but processing time and complexity increase
Solution Approach 1:
The patent performs correction data calculation in advance during the manufacturing or setup phase, storing the results in a correction LUT. This preliminary action eliminates the need for real-time calculation during display operation, significantly reducing processing time while maintaining comprehensive correction for all pixels.
Solution Approach 2:
The patent uses a correction LUT that stores pre-calculated correction values for each pixel. Instead of performing complex calculations for every pixel during operation, the system simply retrieves and applies the stored correction values, dramatically reducing processing complexity and time while maintaining accurate luminance correction.
Data Source
AI summary
A system for correcting defects on a display panel includes: a signal supplier configured to supply a test signal corresponding to each of a first reference gray level, a second reference gray level, and a third reference gray level to the display panel; a luminance calculator configured to capture an image for each reference gray level displayed on the display panel in response to the test signal and to calculate luminance distribution data of the display panel for each reference gray level; and a correction data calculator configured to calculate correction data based on the luminance distribution data for each reference gray level, wherein the first, second, and third reference gray levels have different gray values, the third reference gray level corresponds to a maximum gray value of gray data input to the display panel, and the correction data increases the maximum gray value of the input gray data.