Timing Scrambling Circuit for LCD EMI Reduction
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Solution Overview
Problem
Existing timing scrambling methods in liquid crystal displays are ineffective in reducing electromagnetic interference (EMI) due to the similarity in patterns of data signals generated by random number generators, which limits the effectiveness of scrambling codes in dispersing electromagnetic interference across the spectrum.
Innovation Solution
A timing scrambling method and device that adjusts a selecting signal according to a clock signal to select different random number generating units for generating timing scrambling signals in each clock period, adding a time factor to the scrambling process and reducing the similarity in data patterns, thereby decreasing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a single random number generator is used to generate timing scrambling signals, then the device complexity is reduced, but the electromagnetic interference reduction effectiveness deteriorates due to similar data patterns
Solution Approach 1:
The patent divides the single random number generator into multiple independent random number generators (first, second, third, and fourth random number generators). Each generator produces a separate timing scrambling signal, ensuring that even when input data remains constant, the scrambled output patterns vary significantly across different transmission channels, thereby effectively dispersing electromagnetic interference without requiring complex external control mechanisms.
Solution Approach 2:
The patent introduces dynamic switching between different random number generators based on clock signals. The selecting unit switches between generators in each clock period, making the scrambling system adaptive and time-varying. This dynamic approach ensures that the timing scrambling signal changes over time even for constant input data, enhancing the dispersal of electromagnetic interference across the spectrum.
2Object-generated harmful factors
If the same random number generator is used for all source drivers, then the implementation is simplified, but the scattering of electromagnetic interference across spectrum becomes ineffective
Solution Approach 1:
The patent assigns different random number generators to different source drivers (first random number generator to first source driver, second to second source driver, etc.). This segmentation ensures that each source driver uses a unique scrambling sequence, causing the electromagnetic interference from different channels to be dispersed across different frequency spectra, thereby reducing the peak interference level overall.
Solution Approach 2:
The patent applies different timing scrambling signals to different transmission channels based on local requirements. Each source driver receives a customized scrambling signal from its dedicated random number generator, tailored to its specific transmission needs. This local customization ensures optimal interference dispersal for each channel while maintaining overall system simplicity.
Data Source
AI summary
A timing scrambling method, for a timing control device corresponding to a plurality of source driving devices, includes adjusting a selecting signal according to a clock signal; selecting one of a plurality of scrambling generating units according to the selecting signal to generate a timing scrambling signal; and generating scrambling data for the plurality of source driving devices according to the timing scrambling signal.