Timing Controller Data Inversion for EMI Reduction
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Solution Overview
Problem
Existing image display devices experience high electromagnetic interference (EMI) and increased power consumption due to excessive data transitions during high-frequency video data transmission, particularly when using two-port transmission schemes for reducing EMI.
Innovation Solution
The apparatus and method generate a data inversion signal using transmitted and next data signals, inverting the signal when its logic state is maintained for at least two times, to minimize data transitions by selectively inverting data signals based on the data inversion signal, thereby reducing unnecessary data transitions in the timing controller and data driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-frequency video data is transmitted to satisfy user demand for high-quality video, then video quality and transmission speed are improved, but electromagnetic interference (EMI) increases
Solution Approach 1:
The patent applies dynamics by making the data transmission system adaptable through real-time detection of data transition patterns. The timing controller dynamically adjusts transmission parameters based on the actual video data being transmitted, switching between different transmission modes (single-port or two-port) depending on the detected transition frequency, thereby optimizing the balance between transmission speed and EMI reduction
Solution Approach 2:
The patent changes key parameters of the data transmission system, specifically the transmission frequency and the number of transmission lines used. By detecting the number of data transitions and adjusting the transmission mode accordingly, the system varies these parameters to minimize EMI while maintaining high-quality video transmission
2Object-affected harmful factors
If the number of data transitions is reduced according to data modulation scheme, then electromagnetic interference (EMI) is reduced, but data transmission quality may deteriorate
Solution Approach 1:
The patent implements feedback by having the timing controller detect the actual number of data transitions in the transmitted video data. This detected information is fed back to the control system, which then adjusts the transmission mode (single-port or two-port) based on the detected transition frequency, ensuring that data transmission quality is maintained while minimizing EMI
Solution Approach 2:
The system dynamically adapts its transmission strategy based on real-time detection of data transition patterns. The timing controller switches between different transmission modes depending on the detected transition frequency, ensuring optimal balance between EMI reduction and data transmission quality maintenance
3Object-affected harmful factors
If two-port transmission scheme is used to reduce transmission frequency, then electromagnetic interference (EMI) is reduced, but the number of data transitions remains high
Solution Approach 1:
The patent applies dynamics by making the data transmission system adaptable through real-time detection of data transition patterns. The timing controller dynamically adjusts transmission parameters based on the actual video data being transmitted, switching between different transmission modes (single-port or two-port) depending on the detected transition frequency, thereby optimizing the balance between transmission speed and EMI reduction
Solution Approach 2:
The patent changes key parameters of the data transmission system, specifically the transmission frequency and the number of transmission lines used. By detecting the number of data transitions and adjusting the transmission mode accordingly, the system varies these parameters to minimize EMI while maintaining high-quality video transmission
Data Source
AI summary
An apparatus for transmitting data of an image display device includes an image display part equipped with sub-pixels formed between gate lines and data lines, a data driver for driving the data lines of the image display part, a gate driver for driving the gate lines of the image display part, and a timing controller for controlling operations of the data driver and the gate driver, generating a data inversion signal using an transmitted data signal and the next data signal, switching the data inversion signal when the data inversion signal has a logic state successively maintained at least two times, and transmitting one of the next data signal and the inverted next data signal depending on the data inversion signal.