Dual-Clock Spectrum Spreading With Opposite-Phase Modulation
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Solution Overview
Problem
Current methods for spreading spectrum in LCD panels fail to effectively disperse the energy of clock signals, leading to inadequate electromagnetic interference (EMI) control due to identical energy concentration positions of spread clock signals, which limits data transmission quality.
Innovation Solution
A method that involves acquiring modulation signals opposite in phase for adjacent clock signals, using these signals to control independent voltage controlled oscillators for spectrum spreading, thereby increasing the spread spectrum range while maintaining signal distortion, thus controlling electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same modulation signal is used for spectrum spreading two clock signals, then the implementation is simple, but the energy concentration positions of the spread clock signals remain the same, failing to achieve wide dispersion
Solution Approach 1:
The patent applies asymmetry by using opposite-phase modulation signals for the two clock signals. Specifically, the first modulation signal modulates the first clock signal while the second modulation signal (opposite in phase) modulates the second clock signal, creating asymmetric spectrum spreading patterns that disperse energy concentration positions effectively
Solution Approach 2:
The patent implements inversion by generating the second modulation signal as the inverse (opposite phase) of the first modulation signal. This inversion causes the two spread clock signals to have energy concentrated at different positions, achieving wide dispersion while maintaining implementation simplicity
2Object-generated harmful factors
If the clock signals are spread too widely to disperse energy, then EMI requirements may be met, but data transmission quality deteriorates due to excessive spectrum spreading
Solution Approach 1:
The patent applies parameter changes by carefully controlling the modulation frequency and phase characteristics. The opposite-phase modulation signals are designed with specific frequency ranges that achieve sufficient energy dispersion for EMI compliance while maintaining the spectral characteristics necessary for reliable data transmission
3Manufacturing precision
If larger size, higher resolution, and higher frame rate LCD panels are used, then display quality improves, but the amount of displaying data increases, requiring more complex spectrum spreading
Solution Approach 1:
The patent applies segmentation by dividing the clock signal into two separate spread clock signals, each modulated by opposite-phase modulation signals. This segmentation approach handles the increased data requirements of high-resolution, high-frame-rate displays while keeping each individual modulation path relatively simple
Solution Approach 2:
The patent uses parameter changes in the modulation signals (frequency, phase) to adapt the spectrum spreading to the increased data rates required by larger, higher-resolution displays, maintaining manageable complexity through controlled parameter variation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively increases the spread spectrum range of clock signals, reducing electromagnetic interference while ensuring normal data transmission and meeting EMI specifications.
Implementation Method 1
acquiring a modulation signal corresponding to a clock signal, when the clock signal is detected; and spectrum spreading the clock signal according to the modulation signal, wherein the modulation signals respectively corresponding to two adjacent clock signals are opposite in phase
Data Source
AI summary
Disclosed is a method for spreading spectrum, which includes: acquiring a modulation signal corresponding to a clock signal, when the clock signal is detected; and spectrum spreading the clock signal according to the modulation signal, wherein the modulation signals respectively corresponding to two adjacent clock signals are opposite in phase. The present disclosure further provides a chip, a display panel, and a computer readable storage medium. The present disclosure solves the technical problem of poor spread spectrum effect on dual clock signals.