Pixel Compensation Timing for Stable Display Luminance
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Solution Overview
Problem
Display devices experience deviations in electrical characteristics of driving transistors due to process deviations and deterioration, leading to sub-optimal image display and visual recognition issues.
Innovation Solution
A display device with a pixel unit and a compensator that detects and compensates for transistor characteristics, using a timing controller to convert image signals into compensation data, adjusting luminance through re-write periods to maintain consistent luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time sensing using an external compensation circuit is performed, then electrical characteristic deviation of driving transistors is compensated, but visual recognition phenomenon of sensing horizontal lines occurs
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different pixel regions. Compensation image data is selectively applied to pixel rows affected by sensing operations while leaving other regions unchanged. This localized approach compensates for electrical characteristic deviations in sensed pixels without creating visible artifacts in the entire display, thereby resolving the contradiction between accurate detection and visual quality.
2Adaptability or versatility
If frame frequency is changed, then rendering time flexibility is improved, but luminance decrease due to sensing period becomes more significant
Solution Approach 1:
The patent implements preliminary action by generating and storing compensation image data in advance during blank periods before the actual sensing operation. This pre-prepared compensation data is then applied after sensing to restore luminance, allowing the system to adapt to varying frame frequencies without compromising display brightness during sensing operations.
Solution Approach 2:
The system uses feedback by detecting the actual frame frequency and rendering time, then dynamically adjusting the timing and amount of compensation image data applied. This closed-loop approach ensures that luminance compensation is optimized for each frame frequency, maintaining consistent display quality while preserving the adaptability to different frame rates.
3Illumination intensity
If compensation image data is output during blank period, then luminance compensation is achieved, but timing synchronization becomes more complex
Solution Approach 1:
The patent employs periodic action by utilizing the existing blank period rhythm in the display refresh cycle for compensation operations. Compensation image data is generated and applied periodically during these natural blank intervals, synchronizing with the display's inherent timing structure. This approach achieves effective luminance compensation without adding complex timing mechanisms, as it leverages the periodic nature of display refresh operations.
Data Source
AI summary
A display device includes a pixel unit that includes a plurality of pixels, a compensator configured to receive sensing data from the pixel unit in a sensing period and that detects and compensates for a characteristic of the pixels, and a timing controller configured to convert an image signal received from an outside into image data.