Display Panel Controller Dynamic Luminance Correction
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Solution Overview
Problem
Display panel deterioration leads to image quality degradation, as pixels exhibit varying luminance due to degradation, causing issues like image sticking and uneven brightness across the screen.
Innovation Solution
A display device with a panel controller that accumulates correction image signals to generate degradation data, using lookup tables to determine correction values based on reference data, adjusting image signals to target luminance levels to compensate for pixel degradation, thereby maintaining consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image signals are corrected using fixed reference luminance values, then initial display uniformity is achieved, but display quality degrades over time due to pixel deterioration
Solution Approach 1:
The patent implements dynamic reference luminance values that automatically adjust based on detected pixel degradation levels. Instead of using fixed reference values, the system continuously monitors pixel luminance and updates reference values to compensate for aging effects, thereby maintaining display uniformity throughout the product lifecycle.
Solution Approach 2:
The display device performs self-diagnosis and self-correction by detecting its own pixel degradation and automatically adjusting correction values. The system uses built-in sensors and processing circuits to monitor display quality and apply real-time corrections without external intervention, enabling the device to maintain optimal performance autonomously.
2Illumination intensity
If correction values are increased to compensate for pixel degradation, then luminance uniformity improves, but correction errors increase causing image sticking
Solution Approach 1:
The patent applies different correction values to different regions and pixels based on their individual degradation characteristics. Rather than using a uniform correction approach, the system analyzes degradation patterns across the display and tailors correction parameters locally, preventing over-correction in less degraded areas and adequate correction in more degraded regions.
Solution Approach 2:
The system implements a feedback mechanism where correction results are continuously monitored and used to refine subsequent corrections. By detecting the actual luminance output after correction and comparing it with target values, the system adjusts correction parameters to minimize image sticking while maintaining luminance uniformity, creating a closed-loop control system.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels for displaying an image, and a panel controller configured to receive image signals and convert the image signals into correction image signals. The panel controller includes a first circuit to accumulate the correction image signals each frame period and generate degradation data based on the accumulated correction image signals, and a second circuit configured to determine reference data from the degradation data and generate the correction image signals by correcting the image signals to have a target luminance that is changed based on the reference data.