Data Driving IC Load Signal Converter for EMI Reduction
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Solution Overview
Problem
Display devices, particularly LCDs, face issues with electromagnetic interference (EMI) due to increased operating frequencies, which affect their performance and longevity.
Innovation Solution
The implementation of a data driving integrated circuit (IC) system that generates data voltages with a load signal converter, utilizing a pseudo random binary sequence (PRBS) generator and transistors to create a second load signal with varying falling times, reducing electromagnetic interference by synchronizing data voltage applications across multiple ICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data voltages are applied simultaneously to multiple data lines in LCDs with increased operating frequencies, then productivity and response speed are improved, but electromagnetic interference increases
Solution Approach 1:
The patent applies periodic action by using a pseudo-random binary sequence (PRBS) generator to create load signals with varying falling times. Instead of simultaneous voltage application, the system periodically adjusts the falling times of load signals across different data lines according to a pseudo-random pattern, reducing electromagnetic interference while maintaining high operating frequencies
Solution Approach 2:
The patent implements dynamics by making the falling times of load signals variable rather than fixed. The load signal converter dynamically adjusts the falling times based on the PRBS generator output, allowing the system to adapt signal timing to minimize EMI while preserving high-speed operation capabilities
2Ease of operation
If load signals with identical falling times are used in multiple data driving ICs, then ease of operation is improved, but electromagnetic interference increases
Solution Approach 1:
The patent applies local quality by making each data driving IC generate its own unique load signal characteristics through local PRBS generators. Each IC has different falling times for its load signals, creating local variations that reduce overall EMI while maintaining ease of operation through automated pseudo-random sequence generation
Solution Approach 2:
The system dynamically varies the falling times of load signals in each data driving IC using PRBS generators. This dynamic timing variation prevents simultaneous switching across all ICs, reducing EMI while the automated nature of PRBS generation maintains operational simplicity
Data Source
AI summary
An apparatus for driving a display device includes a plurality of data driving integrated circuits which generates data voltages and a signal controller which inputs a first load signal to a data driving integrated circuit of the plurality of data driving integrated circuits to control the data driving integrated circuit. Each data driving integrated circuit of the plurality of data driving integrated circuits includes a load signal converter which generates a second load signal having a falling time which is different than a falling time of the first load signal.