Scrambler Timing Controller for Display EMI Reduction
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Solution Overview
Problem
The data link between the timing controller and the source driver in LCD devices is prone to electromagnetic interference (EMI), affecting applications such as Wireless Wide Area Network (WWAN) and Bluetooth, due to the lack of effective interference mitigation.
Innovation Solution
Incorporating a display driving circuit with a timing controller and a source driving unit that utilize scramblers and descramblers with distinct random numbers to generate and decode source driving data, maximizing data transmission randomness and minimizing EMI risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct data transmission is used between timing controller and source driver, then device complexity is reduced, but electromagnetic interference affects sensitive applications
Solution Approach 1:
The patent introduces scramblers and descramblers as intermediary devices in the data transmission path. The scrambler converts original data into scrambled data before transmission, and the descrambler restores it at the receiving end. This intermediary scrambling process acts as a mediator that reduces electromagnetic interference while maintaining data integrity, resolving the contradiction between simple transmission structure and EMI protection.
Solution Approach 2:
The patent changes the parameter of data representation by applying scrambling algorithms that transform the original data sequence into a different parameter form (scrambled data). This parameter transformation reduces the electromagnetic characteristics of the transmitted signal, thereby reducing EMI while maintaining the same functional data transmission capability.
2Object-affected harmful factors
If scramblers and descramblers are added to reduce EMI, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The scrambler and descrambler are introduced as intermediary elements that perform simple bit-level operations. While they add components to the system, their function is straightforward and can be implemented efficiently in integrated circuits, making the complexity increase manageable while achieving significant EMI reduction.
Solution Approach 2:
The patent replaces complex physical shielding or filtering mechanisms with electronic scrambling operations. Instead of using physical barriers or complex analog filtering circuits to reduce EMI, the solution uses digital signal processing techniques (scrambling) that can be implemented with simpler electronic logic circuits, thereby reducing overall system complexity compared to alternative EMI mitigation approaches.
Data Source
AI summary
A timing controller is provided. The timing controller includes a timing control circuit, a first scrambler and a second scrambler. The timing control circuit provides first source driving data and second source driving data. The first scrambler scrambles the first source driving data according to a first random number to generate first scrambled data. The second scrambler scrambles the second driving source data according to a second random number to generate second scrambled data. The second random number is different from the first random number.