MicroLED Avionics Display Dithering Fault Detection
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Solution Overview
Problem
Current safety monitors are ineffective in detecting faults in microLED avionics displays, such as flipping or freezing, due to their small size and monolithic design, which differs from liquid crystal displays.
Innovation Solution
A system and method that dithers pixel locations or clusters to monitor display status, detecting expected dithering to ensure functionality and monitoring brightness levels to detect failures, using a comparator and grayscale registers to analyze pixel values between frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional row/column driver monitors or LED/photodiode pairs are used for display monitoring, then liquid crystal display faults can be detected, but microLED display faults cannot be detected due to size and design differences
Solution Approach 1:
The patent changes the monitoring parameter from optical reflection detection (used in LCDs with LED/photodiode pairs) to dithering pattern detection. By introducing temporal variations in pixel brightness patterns and detecting these patterns electronically, the system adapts to microLED's small size and monolithic design while maintaining fault detection capability
Solution Approach 2:
The patent replaces the optical-mechanical detection system (LED/photodiode pairs requiring light reflection and physical corner access) with an electronic detection system that monitors dithering patterns through electrical signal analysis. This substitution enables monitoring of microLED displays where physical optical components cannot be integrated
2Reliability
If display monitoring is implemented using corner-based LED/photodiode pairs, then LCD safety can be ensured, but the method is not operative for microLED displays
Solution Approach 1:
The patent merges the monitoring function with the display driver electronics by implementing dithering pattern generation and detection within the existing display control circuitry. This integration eliminates the need for separate corner-mounted optical components and makes the monitoring system manufacturable with microLED displays
Solution Approach 2:
The patent extracts the monitoring function from the physical display structure (removing the need for corner-mounted optical components) and implements it as a software/firmware-based dithering detection algorithm that operates independently of the display's physical layout or size
3Reliability
If dithering is applied to pixel locations for monitoring, then display functionality can be detected, but additional monitoring complexity is introduced
Solution Approach 1:
The patent implements self-service monitoring where the display system monitors itself by generating dithering patterns and detecting its own operational status. The same display hardware that outputs the image also generates the dithering signal and detects whether the display is correctly showing it, eliminating the need for separate external monitoring equipment
Data Source
AI summary
A system and method for monitoring the status of a pixelated display defines one or more pixel locations or clusters of pixels to be dithered. A monitor determines if the specified pixels or clusters of pixels demonstrate dithering. Detection of the expected dithering indicates a functional display while failure to detect the dithering indicates a failed display. Brightness levels are monitored to detect a failure in brightness leveling. Brightness is monitored at the same locations.