Sub-Pixel Sensing Control for Display Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face luminance deviations due to variations in the characteristics of sub-pixels, such as threshold voltage and electron mobility, which are not uniform across the panel, leading to image quality issues.
Innovation Solution
A display device and driving method that senses the characteristics of a switching transistor by applying different voltages in separate sensing periods and compensates the data voltage based on the sensed differences, using a gate driver, data driver, and driving controller to adjust image data accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels are manufactured with identical structures, then manufacturing complexity is reduced, but luminance uniformity deteriorates due to characteristic variations
Solution Approach 1:
The patent applies local quality by sensing the specific characteristics of each sub-pixel's switching transistor and using this localized information to adjust the data voltage individually. This allows each sub-pixel to receive customized compensation based on its actual threshold voltage and mobility variations, thereby achieving uniform luminance while maintaining identical manufacturing processes.
Solution Approach 2:
The patent changes the data voltage parameter dynamically based on sensed sub-pixel characteristics. By adjusting the data voltage according to the specific threshold voltage and mobility of each sub-pixel's transistor, the system compensates for manufacturing variations and achieves uniform luminance output across all sub-pixels.
2Manufacturing precision
If sensing is performed to compensate for sub-pixel variations, then luminance uniformity is improved, but sensing data distortion occurs
Solution Approach 1:
The patent implements feedback by sensing the actual characteristics of each sub-pixel's switching transistor and using this information to adjust the data voltage. The sensing process measures the threshold voltage and mobility, and the system feeds back this information to compensate for variations, thereby improving luminance uniformity while maintaining sensing data accuracy through proper signal conditioning.
Solution Approach 2:
The patent introduces an intermediary sensing mechanism that measures the characteristics of the switching transistor without directly disturbing the main signal path. By using a separate sensing process that measures threshold voltage and mobility indirectly, the system obtains accurate compensation data without introducing distortion into the primary display signal.
3Manufacturing precision
If data voltage is adjusted based on sensed characteristics, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling each sub-pixel to sense its own switching transistor characteristics and receive self-adjusted data voltage compensation. This distributed sensing and compensation approach improves image quality while minimizing the need for complex external control systems, as each sub-pixel autonomously measures and compensates for its own variations.
Solution Approach 2:
The patent segments the compensation process by handling each sub-pixel's characteristics independently through separate sensing and adjustment operations. This segmentation allows the system to manage complexity through modular processing, where each sub-pixel is compensated individually based on its sensed characteristics, rather than requiring a monolithic complex control system.
Data Source
AI summary
A display device includes a display panel including a first sub-pixel, a gate driver that provides a sensing control signal having a first voltage applied to the first sub-pixel in a first sensing period and a sensing control signal having a second voltage different from the first voltage applied to the first sub-pixel in a second sensing period, a data driver that receives a first sensing voltage from the first sub-pixel through a sensing line in the first sensing period and a second sensing voltage from the first sub-pixel through the sensing line in the second sensing period and a driving controller that controls the data driver and the gate driver and senses a characteristic of the first sub-pixel based on the first sensing voltage and the second sensing voltage.