Electronic Device Impedance Calibration for Stable Video Transmission
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Solution Overview
Problem
High-resolution video transmission between source and display devices is often distorted due to impedance mismatching in printed circuit boards (PCBs) and external influences on cables, leading to signal degradation.
Innovation Solution
An electronic device and display system that includes a wired communication interface and a controller capable of transmitting test signals to calibrate impedance and signal characteristics, ensuring stable signal transmission by adjusting transmission and reception parameters based on error check information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-speed signals are transmitted through conductive line patterns and cables for high-resolution video, then video quality and resolution are improved, but signal distortion occurs due to impedance mismatching
Solution Approach 1:
The patent applies preliminary action by performing impedance calibration before actual high-resolution video transmission. The system transmits test signals and measures impedance characteristics in advance, then adjusts impedance values to match design specifications before transmitting the actual video signal, preventing signal distortion before it occurs
Solution Approach 2:
The patent implements feedback by transmitting test signals through the cable and PCB, measuring the actual impedance values, comparing them with design values, and using this measurement information to adjust and correct the impedance. This closed-loop feedback mechanism ensures that impedance mismatching is detected and corrected to maintain signal integrity
2Reliability
If impedance calibration is performed by transmitting test signals and measuring impedance values, then signal transmission stability is improved, but additional time and processing are required
Solution Approach 1:
The impedance calibration is performed as a preliminary step before actual video transmission, so that when high-resolution video is transmitted, the impedance is already optimized. This preliminary calibration prevents signal distortion during the main operation, making the time investment worthwhile for ensuring transmission stability
Solution Approach 2:
The patent changes impedance parameters by adjusting impedance values based on measured deviations from design specifications. The system modifies electrical parameters (impedance values) of the PCB trace or cable to match the required characteristic impedance, thereby optimizing signal transmission characteristics
Data Source
AI summary
An electronic device is provided. The electronic device may include a wired communication interface connected to a display device through a cable, and a controller that transmits a test signal, which includes specified data, to the display device through the wired communication interface and receives error check information regarding the test signal from the display device through the wired communication interface. The controller may sequentially change transmission characteristic values of the test signal within a specified range to transmit a plurality of test signals, and perform calibration for changing a transmission characteristic of a signal to be transmitted to the display device based on the error check information regarding the plurality of test signals.