Signal Controller ESD Noise Detection and Masking
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Solution Overview
Problem
Display devices, especially thinner ones with touch screen panels, are vulnerable to electrostatic discharge (ESD) noise, which can cause damage and distort data, leading to temporary failures like horizontal lines on the screen.
Innovation Solution
A display device with a signal controller that detects ESD noise using the main clock signal, masks or replaces distorted image signals with previous frame data, preventing abnormal data output and minimizing ESD noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display device is made thinner to achieve a slimmer design, then the aesthetic appearance and portability are improved, but the device becomes more vulnerable to ESD noise which causes data distortion and display failures
Solution Approach 1:
The signal controller proactively monitors the main clock signal for ESD noise before the distorted image signal can cause display failures. By detecting waveform fluctuations in advance and preparing to mask or replace affected data, the system prevents ESD noise from propagating to the display output, thus maintaining reliability despite the thinner design
2Reliability
If ESD noise is detected and the output signal is masked or replaced with previous frame data, then data distortion and horizontal line failures are prevented, but the processing complexity and response time increase
Solution Approach 1:
The signal controller acts as an intermediary between the data driver and display panel. It monitors the main clock signal for ESD noise and intervenes by masking output signals or replacing distorted image data with previous frame data. This intermediary function protects the display system from ESD noise without requiring fundamental changes to the display device architecture
Solution Approach 2:
When ESD noise distorts the current frame image signal, the signal controller copies data from the previous frame to replace the corrupted data. This copying mechanism provides a simple way to restore display normality without complex error correction algorithms, maintaining reliability while minimizing processing complexity
3Measurement precision
If the signal controller continuously monitors the main clock signal for ESD noise, then detection accuracy is improved, but the energy consumption and processing overhead increase
Solution Approach 1:
The signal controller uses the existing main clock signal as the monitoring reference, skipping the need for separate dedicated monitoring circuits. By leveraging the already-present clock signal and detecting ESD noise through waveform fluctuation analysis, the system achieves accurate detection while minimizing additional energy consumption and processing overhead
Data Source
AI summary
A display device including pixels; a data driver configured to apply a data signal to data lines connected to the pixels; and a signal controller configured to receive an image signal, a data enable signal, and a main clock signal, and to transmit an image data signal and an output signal that instructs transmitting of the data signal to the data driver. The signal controller is configured to detect electrostatic discharge (ESD) noise using the main clock signal and to mask the output signal when the image signal is distorted as a result of the ESD noise.