Display Drive Signal Spectrum Spread Control
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Solution Overview
Problem
Current methods to improve electromagnetic interference in display products by spreading the spectrum of clock and drive signals can result in abnormal display pictures if the spread spectrum exceeds expected values, causing the source drive module to fail in receiving data.
Innovation Solution
A drive method for display devices that detects the spread spectrum of drive signals and outputs a clock signal with a preset spread spectrum ratio only if the spectrum is not already spread, ensuring the spectrum is appropriately distributed to reduce electromagnetic interference while maintaining a normal display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spread spectrum is applied to both clock signal and drive signal to improve electromagnetic interference, then electromagnetic interference is reduced, but actual spread spectrum exceeds expected value causing source drive module to fail receiving data
Solution Approach 1:
The patent applies spread spectrum selectively to different signals with different quality requirements. The drive signal receives spread spectrum processing to reduce electromagnetic interference, while the clock signal's spread spectrum is controlled or disabled to maintain timing precision. This local differentiation of signal processing quality resolves the contradiction between electromagnetic interference reduction and data reception reliability.
Solution Approach 2:
The patent dynamically adjusts the spread spectrum ratio parameter for different signal types. By setting appropriate spread spectrum ratios for drive signals while limiting or disabling them for clock signals, the system optimizes electromagnetic interference reduction while preventing excessive spread that would cause data reception failures.
2Object-affected harmful factors
If spread spectrum ratio is increased to further reduce electromagnetic interference, then electromagnetic interference is reduced, but display picture becomes abnormal
Solution Approach 1:
The patent optimizes the spread spectrum ratio parameter to achieve the minimum effective value needed for electromagnetic interference reduction. By carefully controlling this parameter rather than using high values, the system reduces electromagnetic interference while avoiding excessive spread that would degrade display picture quality.
Data Source
AI summary
A display device, a drive method therefor, and a drive system therefor are provided by embodiments of the present application. The drive method includes: detecting whether a spectrum of a drive signal is spread when the drive signal is received, and the drive signal is configured to drive the display panel; outputting a clock signal output from the control module to the source drive module if the spectrum of the drive signal is spread; performing spectrum spread on the clock signal according to a preset spread spectrum ratio if the spectrum of the drive signal is not spread; and outputting the clock signal with the spread spectrum to the source drive module.