Display Driving Device Dynamic Seed Scrambling for EMI Reduction
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Solution Overview
Problem
Existing display devices suffer from incomplete reduction of electromagnetic interference (EMI) due to the use of fixed seed values in converting transmission data into code sequences, resulting in non-random patterns and reduced EMI reduction effects.
Innovation Solution
Implementing a display driving device that uses a linear feedback shift register (LFSR) to scramble transmission data into a pseudo-random-binary sequence (PRBS), which is then transmitted and descrambled by the source driver, with the ability to change the seed value for enhanced randomness and EMI reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed seed value is used to convert transmission data into a code sequence, then the EMI reduction effect is achieved, but the generated code sequence is not completely random and the EMI reduction effect is halved
Solution Approach 1:
The patent applies dynamics by making the seed value changeable rather than fixed. The timing controller changes the seed value of the LFSR in a scramble reset operation, transforming the static seed into a dynamic parameter that varies over time. This ensures that the code sequence generated for EMI reduction is completely random and not repetitive, resolving the contradiction between achieving EMI reduction and maintaining complete randomness.
2Object-affected harmful factors
If a linear feedback shift register with changing seed value is used to generate PRBS, then complete randomness and EMI reduction are improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by making the LFSR-based scrambling mechanism serve multiple functions: it generates random code sequences for EMI reduction, enables high-speed data communication, and provides communication state restoration capability. The same scrambling mechanism with changing seed values handles all these functions, avoiding the need for separate complex systems for each function and thus not significantly increasing overall device complexity.
Data Source
AI summary
The present disclosure discloses a display driving device and a display device including the same, which allow transmission data to be converted into a completely random code sequence. The display device may scramble transmission data into a pseudo-random binary sequence (PRBS) using a linear feedback shift register (LFSR), and may change a seed value of the LFSR every time the scrambling is performed.