Vehicle Dashboard Signal Verification for EMI-Resistant Icon Display
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Solution Overview
Problem
High-speed video signals transmitted to vehicle dashboards are prone to interference due to electromagnetic environments, leading to incorrect icon display on liquid crystal panels, which can affect driver judgment and safety.
Innovation Solution
A microprocessor (MCU) is added to the instrument panel to detect interference in high-speed serial signals, comparing check values to ensure accurate display of icons by sending a normal image signal when interference is detected, and restoring the correct image using a locally stored image or exception prompt when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed video signal is transmitted from vehicle host to liquid crystal display, then display speed and real-time performance are improved, but signal reliability deteriorates due to electromagnetic interference
Solution Approach 1:
The patent implements a feedback mechanism by transmitting check values along with video data and comparing them at the receiving end. The MCU calculates a check value from the received video data and compares it with the transmitted check value to detect transmission errors caused by electromagnetic interference, enabling real-time verification and correction of signal integrity issues.
Solution Approach 2:
The patent introduces an intermediary verification mechanism using check values (CRC or sum checks) that act as mediators between the transmitted video signal and the display output. This intermediary layer allows the system to detect and correct errors without requiring retransmission, maintaining high-speed operation while improving reliability.
2Measurement precision
If check value verification is implemented to detect signal interference, then display accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and transmitting check values together with the video data before display rendering. This allows the verification process to occur in parallel with display operations, minimizing additional processing time while ensuring display accuracy through preemptive error detection.
3Device complexity
If simple error detection is used, then device complexity is reduced, but error detection capability deteriorates
Solution Approach 1:
The patent employs parameter changes by using different types of check value calculations (CRC checks or sum checks) that can be selected based on the required detection capability. These mathematical transformations of the video data create compact verification parameters that provide robust error detection without requiring complex hardware or software implementations.
Data Source
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AI summary
This application discloses a signal sending method. When a user triggers an event of a first icon, a system on chip SOC of a vehicle host generates a high-speed serial signal and sends the high-speed serial signal to an instrument panel, the high-speed serial signal is used to transmit a window image corresponding to the first icon, and the instrument panel includes a deserializer, a microprocessor MCU, and a display, and the method includes: The MCU receives a first image signal sent by the deserializer, where the first image signal is obtained after the high-speed serial signal is parsed. The MCU obtains a first check value based on the first image signal. When detecting that the first check value is different from a second check value corresponding to the first icon, the MCU sends a second image signal to the display. The method disclosed in this application may be applied to an intelligent vehicle, an autonomous vehicle, an electric vehicle, or a new energy vehicle. When it is detected that the first image signal is subject to interference, the second image signal is sent, so that a normal window image including the first icon is displayed on the display, to improve driving safety of a driver.