Display Driving Device Noise Reduction Circuit for Signal Integrity
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Solution Overview
Problem
External noise affecting the common voltage in display devices can cause deviations in input data levels, leading to failure in clock, image, and control data recovery by the source driver, resulting in image failure.
Innovation Solution
Incorporating a noise reduction circuit that detects lock fails, generates a common voltage with a fixed level, and supplies it to the node between terminating resistors, minimizing the influence of external noise on the common voltage and maintaining stable input data levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminating resistors are used for impedance matching on data wires, then signal transmission quality is improved, but the system becomes sensitive to external noise affecting common voltage
Solution Approach 1:
A noise reduction circuit is introduced as an intermediary component between the data wires and the source driver. This circuit detects lock fails caused by external noise and generates a common voltage to counteract the noise effect, thereby protecting the signal transmission system without removing the terminating resistors
Solution Approach 2:
The noise reduction circuit implements a feedback mechanism by continuously monitoring the lock status of the source driver and detecting lock fails. When external noise causes a lock fail, the circuit generates a common voltage in response, creating a closed-loop system that automatically compensates for noise interference
2Reliability
If common voltage level changes due to external noise, then input data level deviation occurs, but adding noise reduction circuitry increases system complexity
Solution Approach 1:
The noise reduction circuit serves as a dedicated intermediary component that isolates the complex noise compensation function from the main data transmission path. By placing this circuit at the receiver end (source driver), it handles noise mitigation without affecting the transmitter side, thus improving reliability with minimal impact on overall system complexity
Solution Approach 2:
The source driver's noise reduction circuit performs self-diagnosis by detecting lock fails and self-correction by generating the appropriate common voltage. This self-service capability allows the system to maintain high reliability without requiring additional external control systems or increasing operational complexity
Data Source
AI summary
The present disclosure discloses a display driving device insensitive to external noise. The display driving device may include first and second data wires configured to connect a transmitter of a timing controller and a receiver of a source driver, first and second terminating resistors configured to connect the first and second data wires, and a noise reduction circuit configured to detect a lock fail, generate a common voltage when detecting the lock fail, and provide the common voltage to a node between the first and second terminating resistors. The display driving device can prevent an image failure by minimizing the influence of external noise.