Display Device Noise Compensation via Phase Shift Synthesis
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Solution Overview
Problem
Existing display devices face challenges with signal distortion and electromagnetic interference (EMI) noise, particularly at higher frequencies, due to delays in phase cancellation methods.
Innovation Solution
A display device that implements a compensation signal generator to produce a noise compensation signal with zero delay by synthesizing target signals, including a detection unit to detect phase shift signals and an inversion unit to generate phase inversion signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a phase cancellation method is used to compensate for electromagnetic interference noise, then noise reduction is improved, but signal delay occurs between the target signal and phase inversion signal, reducing cancellation effectiveness especially in high frequency domains
Solution Approach 1:
The patent applies preliminary action by synthesizing multiple target signals in advance to extract the phase shift signal before noise compensation is needed. This pre-extraction eliminates delay during the actual compensation process, as the phase shift signal is already prepared and synchronized with the noise signal when cancellation is performed.
Solution Approach 2:
The patent uses copying by creating a phase shift signal that replicates the characteristics of the noise signal through synthesis of multiple target signals. This copied signal structure maintains the same frequency and phase relationships as the original noise, enabling effective cancellation without introducing delay.
2Measurement precision
If resolution of the display device is increased, then image quality is improved, but higher frequencies and more signals are required, resulting in signal distortion and electromagnetic interference noise
Solution Approach 1:
The patent converts the harmful electromagnetic interference signals into a beneficial solution by synthesizing multiple target signals to extract their phase shift characteristics. The phase shift signal, derived from the same high-frequency signals causing interference, is then inverted and added back to cancel the noise, transforming the harmful EMI into a useful cancellation mechanism that enables higher resolution operation.
Data Source
AI summary
A display device includes a display panel including pixels which display images; a display panel driving circuit which outputs a drive signal for driving the display panel; and a compensation signal generator which senses a noise signal generated by the display panel or the display panel driving circuit and generates a noise compensation signal corresponding to the noise signal. The compensation signal generator includes: a detection unit which detects a phase shift signal generated by synthesizing target signals; and an inversion unit which generates a phase inversion signal by inverting a phase of the phase shift signal.