Display Signal Strength Feedback for RF Noise Interference
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Solution Overview
Problem
RF noise from mobile phones can interfere with the data signal transmission between a timing controller and a source driving circuit in display devices, causing the display to malfunction by preventing correct latching of the data signal.
Innovation Solution
A display driving device with a timing controller and a source driver that detects interference events and adjusts the signal strength of the data signal based on feedback from the source driver, using a clock data recovery circuit to determine interference and output a feedback signal to the timing controller, thereby increasing the signal strength to prevent phase changes due to RF noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal strength of the data signal is increased to prevent RF noise interference, then the reliability of data transmission is improved, but the energy consumption and potential for electromagnetic interference increases
Solution Approach 1:
The patent implements dynamic signal strength adjustment where the timing controller modifies the data signal strength based on real-time feedback from the source driver about RF noise interference conditions. This dynamic adaptation allows the system to use higher signal strength only when necessary, resolving the contradiction between reliability and energy consumption.
Solution Approach 2:
The source driver detects RF noise interference and sends feedback information to the timing controller, which then adjusts the data signal strength accordingly. This feedback mechanism enables the system to maintain optimal signal strength for reliable transmission while avoiding unnecessary energy consumption when interference is absent.
2Reliability
If the signal strength of the data signal is continuously increased to ensure correct latching, then the reliability is improved, but the electromagnetic interference generated by the display driving device increases
Solution Approach 1:
Instead of continuously increasing signal strength, the patent uses dynamic adjustment based on detected interference conditions. The signal strength is increased only when RF noise interference is detected, thereby maintaining latching reliability while minimizing electromagnetic interference generation.
Solution Approach 2:
The patent changes the signal strength parameter dynamically based on interference detection results. By adjusting this parameter only when necessary, the system ensures correct latching while reducing overall electromagnetic interference compared to continuous high signal strength operation.
3Reliability
If the timing controller adjusts the data signal strength in response to interference detection, then the reliability under interference conditions is improved, but the device complexity increases
Solution Approach 1:
The patent uses a feedback mechanism where the source driver detects interference and communicates this to the timing controller, which then adjusts signal strength. This feedback-based approach improves reliability under interference while keeping the control logic relatively simple and modular.
Solution Approach 2:
The source driver performs self-detection of interference conditions and automatically triggers the appropriate response by signaling the timing controller. This self-service capability reduces the need for complex external monitoring systems while improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents display malfunctions due to RF noise interference, ensuring correct image display and facilitating the passing of electromagnetic interference and safety tests by only increasing signal strength during interference events.
Implementation Method 1
the source driver includes a clock data recovery circuit which receives a data signal and performs a phase-locking operation on the data signal. The source driver determines whether an interference event occurs based on a result of locking the data signal by the clock data recovery circuit.
Data Source
AI summary
A display driving device and an anti-interference method thereof are provided. A timing controller outputs a data signal. A source driver detects an interference event according to the data signal, and outputs a feedback signal to the timing controller in response to the detection result of the interference event. The timing controller adjusts the signal strength of the data signal according to the feedback signal.