Micro-LED Panel Self-Monitoring Using Coverglass Light Sensing
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Solution Overview
Problem
Micro-LED display panels degrade over time, leading to decreased light output intensity, spatial variation in light output, shifts in color balance, and changes in polarization, which are not effectively monitored post-factory calibration.
Innovation Solution
A self-monitoring system is integrated into the micro-LED display panel, comprising light sensors and a coverglass with an anti-reflective coating that directs emitted light towards the sensors for analysis, allowing continuous monitoring of light attributes such as color, polarization, and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external photodiodes and photodetectors are used for monitoring light output during factory calibration, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the monitoring function with existing display components by using the coverglass as both a protective element and an optical element for light extraction. The anti-reflective coating on the coverglass serves dual purposes: reducing unwanted reflections for display quality and enabling light extraction for monitoring. This integration eliminates the need for separate external monitoring devices while maintaining measurement capability.
Solution Approach 2:
The coverglass is designed to perform multiple functions simultaneously: it serves as the protective top layer of the display, provides anti-reflective properties for display optimization, and acts as a light extraction interface for monitoring purposes. The anti-reflective coating similarly serves both display performance enhancement and monitoring light extraction functions.
2Reliability
If on-board monitoring is implemented to continue monitoring light output during operation, then reliability is improved through life-cycle maintenance, but device complexity increases
Solution Approach 1:
The monitoring system is merged with the display structure by utilizing the coverglass and anti-reflective coating as integral components for both display function and monitoring function. This approach allows continuous monitoring during operation without adding separate complex monitoring hardware, thereby improving reliability through life-cycle monitoring while minimizing increases in device complexity.
3Measurement precision
If light sensors are integrated around the periphery of the micro-LED array, then measurement capability is improved for continuous monitoring, but manufacturing precision requirements increase
Solution Approach 1:
The monitoring system is segmented into distinct functional zones: the micro-LED array occupies the central display area, while light sensors are positioned in the peripheral regions. This spatial segmentation allows sensors to be placed in areas that do not interfere with the active display pixels, enabling continuous monitoring while maintaining reasonable manufacturing precision requirements for sensor positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous tracking of micro-LED health status, enabling adjustments to maintain consistent light output and color balance by compensating for degradation, thereby extending the display's lifespan and improving user experience.
Implementation Method 1
a coverglass disposed adjacent to the array, the coverglass configured to transmit a first portion of emitted light and to reflect a second portion of the emitted light toward the light sensors
Implementation Method 2
A self-monitoring system is integrated into the micro-LED display panel, comprising light sensors and a coverglass with an anti-reflective coating that directs emitted light towards the sensors for analysis
Data Source
AI summary
A self-monitoring system for a micro-LED display panel can track a health status of the micro-LED emitters over the life cycle of the display. The self-monitoring system can include, for example, light sensors and a coverglass treated with an anti-reflective coating that directs light emitted by the micro-LED array toward the light sensors. Light captured by the light sensors can then be analyzed to determine the current value of light attributes such as color, polarization, and intensity, and to compare the current values of the light attributes with their previous values to monitor changes over time.