Display Device Optical Compensation for Luminance Uniformity
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Solution Overview
Problem
Display devices experience non-uniform luminance due to degradation of driving transistors and light emitting elements over time, leading to inconsistent image quality.
Innovation Solution
A display device that senses current through pixels, generates sensing data to compensate for degradation by using look-up tables and optical compensation to adjust pixel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the display device operates for a long duration, then productivity is maintained, but the driving transistor and light emitting element degrade, causing non-uniform luminance
Solution Approach 1:
The patent performs preliminary sensing of pixel characteristics at multiple time points (initial sensing during fabrication, intermediate sensing after shipping, and continuous sensing during operation). By detecting degradation trends early and establishing compensation data in advance, the system can proactively adjust display parameters to maintain uniform luminance throughout the device's operational lifecycle, preventing non-uniformity rather than reacting to it after it occurs.
Solution Approach 2:
The patent implements a feedback mechanism where sensing data from multiple time points is used to generate compensation data that feeds back into the display driving process. The timing controller uses degradation sensing data to calculate compensation values that are applied to subsequent display operations, creating a closed-loop system that continuously corrects for aging effects and maintains luminance uniformity over time.
2Reliability
If sensing data is collected at multiple time points to compensate for degradation, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the compensation process into distinct functional modules: initial sensing during fabrication, intermediate sensing after shipping, continuous sensing during operation, and separate processing for anomalous pixels versus normal pixels. This segmentation allows each component to handle specific tasks independently, making the overall complex system more manageable and maintainable while achieving comprehensive degradation compensation.
Solution Approach 2:
The patent applies different compensation strategies to different pixel types based on their characteristics. Anomalous pixels (those with significant degradation) receive specialized compensation using degradation sensing data and substitution data, while normal pixels use standard compensation. This localized approach ensures that compensation resources are allocated efficiently where needed most, reducing unnecessary complexity in areas that don't require intensive compensation.
Data Source
AI summary
A display device includes: a pixel component including pixels; and a timing controller which controls the pixel component. The timing controller includes: a first look-up table which stores initial sensing data generated by sensing characteristics of the pixels at a first time point, and stores degradation sensing data generated by sensing characteristics of the pixels at a second time point; a second look-up table which stores initial sensing data of an anomalous pixel having a value difference equal to or greater than an initial threshold value from initial sensing data of peripheral pixels, and stores degradation sensing data of the anomalous pixel; an optical look-up table which stores optical data, based on which optical compensation of the pixels is performed; and an optical compensator which updates the optical data with reference to the first and second look-up tables to compensate for degradation of the anomalous pixel.