Display Interface Bias Control for Common-Mode Voltage Balance
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Solution Overview
Problem
Existing display device interface systems face challenges in maintaining reliable communication due to fluctuations in common mode voltage, leading to synchronization failures between the transmitter and receiver, which affect data signal transmission and image quality.
Innovation Solution
An interface system that includes a receiver, a transmitter, bias circuits for adjusting common mode voltage, and a balance voltage detector using comparators to detect and compensate for voltage imbalances, ensuring periodic compensation of common mode voltage to maintain stable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AC coupling capacitor is connected to transmission line to minimize DC component, then common mode voltage matching is improved, but communication reliability deteriorates due to common mode voltage fluctuations
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects common mode voltage fluctuations and transmits balance control signals back to the transmitter. The transmitter adjusts its common mode voltage based on these feedback signals, creating a closed-loop control system that continuously maintains voltage matching despite fluctuations, thereby resolving the contradiction between initial voltage matching and ongoing communication reliability
Solution Approach 2:
The patent dynamically changes the common mode voltage parameter at the transmitter side in response to detected fluctuations. By adjusting the common mode voltage level based on feedback from the receiver, the system adapts to changing conditions and maintains reliable communication, overcoming the limitation of static AC coupling capacitor approaches
2Reliability
If common mode voltage is adjusted to maintain communication, then synchronization is improved, but system complexity increases due to additional control circuits
Solution Approach 1:
The patent makes the receiver serve multiple functions: it not only receives data signals but also detects common mode voltage fluctuations and generates balance control signals. This multi-functionality reduces the need for separate dedicated control circuits at the receiver side, thereby improving synchronization while minimizing the increase in overall system complexity
Solution Approach 2:
The system implements self-service through automatic common mode voltage adjustment. The receiver autonomously detects voltage imbalances and sends correction signals to the transmitter, which then self-adjusts its voltage output. This automated process eliminates the need for manual intervention or complex external control systems, achieving reliable synchronization with manageable system complexity
Data Source
AI summary
An interface system including: a receiver; a transmitter configured to transmit a signal including a common mode voltage to the receiver through transmission lines; and a plurality of bias circuits configured to adjust the common mode voltage of the signal, wherein the bias circuits are configured to receive a bias control bit to generate a biased common mode voltage.