Display System Integrity Data Position Verification
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Solution Overview
Problem
Display systems, particularly in safety-critical applications like automotive rear camera systems, can malfunction due to processing system failures, leading to frozen images that do not accurately reflect the original data, posing safety risks.
Innovation Solution
A display system that includes a processing circuit to insert integrity data into pixel data, which changes position within the data, allowing a further processing circuit to verify its position and detect malfunctions, generating a warning signal if issues are detected, and displaying a warning message on the graphic display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the processing system stores pixel data to the frame buffer without verification, then the operation speed is maintained, but the reliability of the display system deteriorates due to potential malfunctions and frozen images
Solution Approach 1:
The patent applies preliminary action by inserting integrity data into the pixel data before storing it to the frame buffer. The processing circuit modifies the pixel data by embedding integrity information (such as checksums or error detection codes) at specific positions before the data is written to memory. This allows the display system to detect malfunctions proactively rather than reactively, improving reliability without requiring complex verification hardware during the display operation.
Solution Approach 2:
The patent uses an intermediary approach by introducing integrity data as a mediator between the pixel data and the frame buffer. This integrity data acts as a verification layer that can be checked by the display circuit without interfering with the normal pixel rendering process. The intermediary integrity data enables error detection while maintaining the simplicity of the original display pipeline.
2Reliability
If the processing circuit inserts integrity data into pixel data, then the data integrity is improved, but the processing time and complexity increase
Solution Approach 1:
The patent applies partial action by inserting integrity data at selective positions within the pixel data rather than processing every single pixel. The integrity data is embedded at specific intervals or key positions that are sufficient for error detection without requiring complete processing of all pixel data. This selective approach maintains data integrity while minimizing the additional processing time required.
3Difficulty of detecting and measuring
If the display system uses a simple frame buffer without verification, then the device complexity is low, but the detection capability of malfunctions deteriorates
Solution Approach 1:
The patent applies merging by combining the integrity verification function with the existing frame buffer and display circuitry. The integrity data is integrated into the same memory structure and processing pipeline as the pixel data, allowing verification to occur using the existing hardware resources. This merging approach enables malfunction detection without requiring separate verification hardware, thus avoiding significant increases in device complexity.
Data Source
AI summary
A display system comprises a processing circuit configured to receive image data from a video source, and generate a current image frame by generating pixel data as a function of the image data and storing the pixel data to a frame buffer. A graphic video driver is configured to display the image frame by reading the pixel data from the frame buffer and generating drive signals for the graphic display as a function of the pixel data read. The processing circuit also is configured to insert integrity data into the pixel data of the current image frame, wherein the position of the integrity data within the pixel data changes. The display system comprises a further processing circuit configured to read the pixel data from the frame buffer and verify whether the position of the integrity data within the pixel data changes.