Display Control Circuit Self-Check Using Still-Image Error Codes
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Solution Overview
Problem
Existing display control systems lack an efficient method to check whether each circuit block is operating correctly without increasing circuit scale or processing complexity.
Innovation Solution
A display control system that includes a processing device outputting an expected error detection code for a specific still image, and a circuit device with an error check circuit to calculate and compare the error detection code value with the expected value, allowing for error detection using a known still image displayed during system startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic error checking is performed on each circuit block, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the still image serve multiple functions: it is both the displayed content and the test object for error detection. The same image data is used for normal display and for generating error detection codes, eliminating the need for separate test circuits or test images.
Solution Approach 2:
The system performs self-diagnosis by automatically generating and comparing error detection codes for the displayed still image. The error detection circuit within the system checks its own operation by processing the same image data that is being displayed, enabling autonomous error detection without external intervention.
2Reliability
If dynamic error checking is performed on each circuit block, then reliability is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing error detection during the display of a still image, which occurs naturally during system operation or startup. The error detection is integrated into the normal display process, so no additional processing steps or separate testing procedures are required.
3Measurement precision
If error detection code comparison is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the error detection function with the existing display control circuitry. The error detection circuit shares resources with the normal display processing, combining multiple functions into a unified system rather than adding separate dedicated test equipment.
Data Source
AI summary
A display control system includes: a processing device; and a circuit device configured to perform display control on a display device under control of the processing device. The processing device outputs an expected value of an error detection code of a specific still image in a predetermined frame of a video displayed on the display device, and the circuit device includes an error check circuit that receives image data of the video from the processing device, calculates an error detection code value of the specific still image in the predetermined frame, and checks an error by comparing the error detection code value with the expected value.