Display Panel Compensation Modes for OLED Brightness Uniformity
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Solution Overview
Problem
Display devices, particularly OLEDs, face image quality degradation due to brightness non-uniformity caused by deviations in threshold voltage and mobility of driving transistors, which worsen when driving frequency changes, leading to compensation errors.
Innovation Solution
A display device and method that differentiate compensation modes based on driving frequency variations, using real-time sensing for entire panel compensation when frequencies are below a reference value and temperature-based compensation for areas above this value, switching between modes to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time sensing process is used for entire panel compensation, then compensation accuracy is improved, but processing time increases and cannot keep up with high driving frequencies
Solution Approach 1:
The patent divides the display panel into multiple regions (first region and second region) and applies different compensation methods to each region. The first region uses real-time sensing for high accuracy compensation, while the second region uses temperature-based compensation for faster processing. This segmentation resolves the contradiction by allowing accurate compensation where needed while maintaining overall speed through selective application of compensation methods.
Solution Approach 2:
The patent applies real-time sensing compensation only to a partial region (first region) of the display panel rather than the entire panel. This partial action provides sufficient compensation accuracy for the most critical areas while reducing overall processing time and computational load, thereby resolving the time-accuracy tradeoff.
2Productivity
If temperature-based compensation is used for partial area, then processing speed is improved, but compensation accuracy deteriorates
Solution Approach 1:
The patent applies different compensation qualities to different regions: high-accuracy real-time sensing compensation for the first region and faster temperature-based compensation for the second region. This local differentiation of compensation quality resolves the contradiction by providing high accuracy where most needed while maintaining overall processing speed through faster compensation in other regions.
Solution Approach 2:
The patent applies temperature-based compensation only to a partial region (second region) of the display panel. This partial application of lower-accuracy compensation method maintains processing speed while the real-time sensing on the first region provides sufficient overall accuracy, resolving the speed-accuracy tradeoff.
3Speed
If driving frequency is increased to improve refresh rate, then image quality improves, but compensation errors increase due to insufficient time for real-time sensing
Solution Approach 1:
The patent segments the compensation approach by region, allowing the display to maintain high refresh rates while providing accurate compensation in the first region through real-time sensing and acceptable compensation in the second region through temperature-based methods. This enables high-speed operation without sacrificing critical compensation accuracy.
Solution Approach 2:
The patent changes the compensation parameter from real-time sensing to temperature-based compensation for the second region, enabling faster processing that keeps up with high driving frequencies while maintaining sufficient accuracy through the dual-region approach.
4Manufacturing precision
If real-time sensing is performed for entire panel, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the compensation system into two distinct pathways: real-time sensing for the first region and temperature-based compensation for the second region. This segmentation reduces overall system complexity by avoiding the need to implement real-time sensing across the entire panel while maintaining high image quality in the most critical display areas.
Data Source
AI summary
A display device includes a display panel comprising subpixels, data lines, and driving transistors, a data driving circuit configured to convert image data into data voltages and apply the data voltages to the data lines, and a timing the controller configured to control the data driving circuit and switch between a first compensation mode and a second compensation mode responsive to a driving frequency variation of the display device during exceeding a reference value, wherein, in the first compensation mode, the data voltages of the driving transistors in an entire area of the display panel are compensated through a real-time sensing process of characteristic values of the driving transistors during a blank period, and in the second compensation mode, the data voltages of the driving transistors in at least a partial area of the display panel are compensated according to a temperature value of the display panel.