Display Harmonic Noise Inspection Using Signal Preprocessing
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Solution Overview
Problem
Harmonic noise signals in display devices exhibit large waveform changes and irregular frequency bands, leading to unreliable inspection results for evaluating driving characteristics and lifespan.
Innovation Solution
A harmonic noise inspection device with an inspection control circuit, frequency signal detector, signal modulation circuit, and signal processing circuit to preprocess noise signals by removing and interpolating data, generating preprocessed noise signal data for accurate analysis of driving characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If harmonic noise signals are directly analyzed without preprocessing, then the inspection process is simple, but the analysis reliability is low due to large waveform changes and irregular frequency bands
Solution Approach 1:
The patent applies preliminary action by implementing a preprocessing step before noise signal analysis. The preprocessing circuit performs smoothing and interpolation operations on the harmonic noise signals to remove irregularities and waveform variations. This preliminary treatment ensures that the subsequent analysis operates on cleaned data, significantly improving analysis reliability without requiring complex analysis algorithms.
Solution Approach 2:
The patent introduces a preprocessing circuit as an intermediary between the noise signal source and the analysis unit. This intermediary component processes the raw noise signals by smoothing and interpolating them, transforming the irregular signals into reliable data. The preprocessing circuit acts as a mediator that bridges the gap between raw signal acquisition and reliable analysis, resolving the contradiction between simplicity and reliability.
2Measurement precision
If noise signal data is smoothed and preprocessed by removing and interpolating data, then analysis accuracy is improved, but the processing time and complexity increase
Solution Approach 1:
The patent applies parameter changes by modifying the noise signal data through smoothing and interpolation operations. The preprocessing circuit adjusts the signal parameters (amplitude, frequency) by removing outliers and interpolating missing data points. This parameter transformation converts inaccurate raw signals into precise measurement data, achieving high analysis accuracy while maintaining efficient processing through deterministic algorithms.
3Reliability
If preprocessing operations are performed on noise signals, then the quality of noise signal data is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the inspection device into distinct functional modules: a noise signal acquisition unit, a preprocessing circuit, and an analysis unit. The preprocessing circuit is further segmented into specific functional blocks for smoothing and interpolation operations. This modular segmentation allows each component to perform its function independently, improving noise signal data quality while keeping the overall device complexity manageable through clear functional separation.
Data Source
AI summary
In a harmonic noise inspection device for display devices, the inspection device includes an inspection control circuit configured to control image display driving of a display device during a noise inspection period, a frequency signal detector configured to detect harmonic noise signals generated from at least one of a display panel, a display circuit board, a display driver circuit, or a touch driver circuit of the display device, a signal modulation circuit configured to perform analog-digital modulation on the harmonic noise signals to generate noise signal data on the harmonic noise signals, and a signal processing circuit configured to analyze changes in amplitude of the harmonic noise signals through the noise signal data, to perform a preprocessing process of selectively removing and interpolating the noise signal data based on analysis results, and to use the preprocessed noise signal data to analyze driving characteristics of the display device.