Video Output Supervisor for Safety-Critical Display Verification
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Solution Overview
Problem
Existing safety-related display systems face increased complexity and cost due to the need for external optical sensors to verify the proper display of safety-critical data, which complicates manufacturing, maintenance, and operation.
Innovation Solution
A video output supervisor is introduced, which includes a test region indicator to verify the validity of commanded outputs to specific areas of a display, and measures other display and frame parameters to supervise safety-critical data, enhancing supervision confidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external optical sensors are used to verify the proper display of safety-critical data, then the reliability of safety-related display is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The display system performs self-verification by monitoring its own output signals internally without requiring external optical sensors. The supervisor circuit integrates within the display controller to automatically detect and report display errors, eliminating the need for separate verification components.
Solution Approach 2:
The supervision functionality is merged with the existing display controller circuitry rather than being implemented as a separate external system. This integration combines the display generation and verification functions into a single unified component, reducing overall system complexity.
2Measurement precision
If external optical sensors are used to monitor display indicators, then the verification accuracy is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces external optical sensing hardware with electronic signal monitoring within the digital display controller. Instead of using optical sensors to physically detect display output, the system electronically compares commanded display data with actual display output signals, achieving verification through electrical rather than optical means.
Solution Approach 2:
The supervisor circuit creates and compares a copy of the commanded display data with the actual display output. This digital copying and comparison approach provides accurate verification without requiring physical optical sensing of the display elements.
3Difficulty of detecting and measuring
If external optical sensors are used for display supervision, then the detection capability is improved, but the ease of operation and maintenance deteriorates
Solution Approach 1:
The display system automatically performs error detection and reporting without requiring external monitoring equipment or complex operational procedures. The supervisor circuit continuously monitors display output and automatically generates error signals when discrepancies are detected, simplifying operation and maintenance.
Data Source
AI summary
A video output supervisor includes a test region indicator for verifying that the commanded output to specific areas of a display is valid. Areas reserved displaying safety-critical data in the data frame to be displayed can be supervised for the presence and status of display indicators of the safety-critical data. The confidence of the supervision can be increased by measuring other display and frame parameters in conjunction with supervising the indicators of the safety-critical data.