Micro-LED Display Temperature Compensation via Distributed Sensing
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Solution Overview
Problem
Electronic displays, particularly micro-LED displays, experience color artifacts due to temperature variations, which can disrupt the viewing experience and are costly to address by replacing entire displays.
Innovation Solution
The implementation of temperature sensors distributed across the display to measure temperature data, which is then used to apply both analog and digital corrections to compensate for temperature-related issues, such as micro-LED external quantum efficiency mismatch and driving current variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are distributed across the display to measure temperature data, then temperature measurement precision is improved, but device complexity increases
Solution Approach 1:
The display panel is segmented into multiple temperature zones with distributed temperature sensors placed at different locations (e.g., corners and center) to measure local temperatures independently. This segmentation enables precise temperature measurement across different display regions without requiring a single complex sensing system.
Solution Approach 2:
Temperature sensors act as intermediary elements between the display panel and the control system. These sensors measure local temperatures and provide data to the controller, which then applies compensation algorithms to correct color artifacts. The sensors serve as mediators that enable indirect temperature compensation without requiring direct intervention in the display pixel operation.
2Reliability
If analog and digital corrections are applied to compensate for temperature variations, then display quality is improved, but processing complexity increases
Solution Approach 1:
Temperature compensation data is pre-calculated and stored in lookup tables during manufacturing or system initialization. When temperature variations occur, the controller simply retrieves pre-computed compensation values from these tables based on measured temperature, rather than performing complex real-time calculations. This preliminary action significantly reduces processing complexity during operation.
Solution Approach 2:
The system implements a feedback loop where temperature sensors continuously monitor display panel temperature, the controller compares measured temperatures against reference values, and automatically applies compensation corrections to pixel driving signals. This closed-loop feedback mechanism maintains display quality dynamically without requiring complex manual intervention or prediction algorithms.
Data Source
AI summary
To reduce image artifacts induced by temperature variations associated with display pixels of an electronic display, processing circuitry may process temperature sensing data to obtain an average temperature and a temperature distribution of the electronic display. Based on the processed temperature data, the processing circuit may adjust a reference voltage applied to the display pixels to compensate for the average temperate. To further correct for the image artifacts, the processing circuitry may transform image data to luminance domain. Based on the processed temperature data, the processing may adjust luminance vales of the image data to compensate for the temperature distribution.