Timing Controller Data Rates With SSC for LCD EMI and Wavy Lines
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Solution Overview
Problem
Conventional point-to-point timing controllers experience high electromagnetic interference (EMI) peaks and line luminance deviations due to single data rate transmission, leading to wavy issues in liquid crystal display (LCD) panels, especially with higher resolution panels where thin-film transistors are not fully charged.
Innovation Solution
The method involves applying multiple modulated data rates using spread-spectrum clocking (SSC) to transmit image data from a timing controller to source drivers, where each frame uses a unique modulated data rate, reducing EMI peaks and improving line luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single data rate is used to transmit frame data, then the transmission system is simple, but high electromagnetic interference (EMI) peaks occur
Solution Approach 1:
The patent applies dynamics by transitioning from a static single data rate to dynamic multiple data rates. The system selectively switches between different data rates (first, second, and third data rates) based on transmission requirements, making the data transmission rate variable rather than fixed. This dynamic adjustment reduces EMI peaks while maintaining transmission simplicity.
Solution Approach 2:
The patent changes the parameter of data rate from a single fixed value to multiple variable values. By using different data rates for different frames or transmission conditions, the system effectively reduces EMI peaks. The parameter change involves selecting among predetermined first, second, and third data rates based on transmission needs.
2Object-generated harmful factors
If spread spectrum techniques are used to reduce EMI peak, then some EMI reduction is achieved, but the effect is insufficient for severe EMI cases
Solution Approach 1:
The patent enhances EMI reduction by changing the data rate parameter dynamically among multiple predetermined rates (first, second, and third data rates). This goes beyond conventional spread spectrum by actively switching data rates based on transmission conditions, providing more effective EMI suppression for severe cases while maintaining transmission reliability.
3Manufacturing precision
If higher resolution LCD panel is used, then display quality is improved, but thin-film transistors are not fully charged causing line luminance deviation and wavy issues
Solution Approach 1:
The patent applies periodic action by using different data rates for different frames in a periodic manner. This frame-by-frame variation in transmission rate allows sufficient charging time for thin-film transistors while maintaining high resolution display quality, preventing line luminance deviation and wavy issues through rhythmic transmission patterns.
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
This approach effectively reduces EMI peaks and mitigates line luminance deviations, enhancing data quality and reducing wavy issues in LCD panels by using discrete data rate settings and SSC to manage data transmission.
Implementation Method 1
the plurality of modulated data rates are generated by performing spread-spectrum clocking (SSC) upon the plurality of data rates, respectively
Data Source
AI summary
The present invention provides a method for transmitting data from a timing controller to a source driver, wherein the method includes the steps of: applying a plurality of data rates to a discrete data rate setting; and transmitting image data of a plurality of frames by using a plurality of modulated data rates, respectively; wherein the plurality of modulated data rates are generated by performing spread-spectrum clocking (SSC) upon the plurality of data rates, respectively; and for each of the frames, its corresponding image data is transmitting by using only one of the modulated data rates.