Data Driver Black Voltage Generation for Abnormal State Protection
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Solution Overview
Problem
Display panels in devices like LED, QDD, and LCD can enter abnormal operation states due to increased temperature and deteriorating driving stability, leading to potential display issues.
Innovation Solution
A data driver that generates a voltage for displaying black when in an abnormal operation state, using a multiplexer and latch to output a black voltage based on an internal lock signal, thereby minimizing abnormal phenomena and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the data driver continues normal operation in abnormal state, then productivity is maintained, but reliability deteriorates due to temperature increase and driving instability
Solution Approach 1:
The data driver autonomously detects abnormal states through the lock signal monitoring circuit and automatically switches to black voltage output without external intervention. The system serves itself by detecting its own abnormal conditions and correcting them, eliminating the need for external control during fault conditions.
Solution Approach 2:
The system uses the lock signal as a feedback mechanism to monitor the synchronization between data signals and clock signals. When the lock signal indicates abnormality (loss of synchronization), the system receives feedback and automatically switches to black voltage output, creating a closed-loop control system that maintains reliability.
2Reliability
If the data driver outputs black voltage in abnormal state, then reliability is improved by preventing panel damage, but productivity decreases due to display interruption
Solution Approach 1:
The system takes preliminary protective action by switching to black voltage output before actual panel damage can occur. By detecting abnormal states early through lock signal monitoring and preemptively switching to black voltage, the system prevents harmful effects from developing further.
Solution Approach 2:
The system provides beforehand cushioning by preparing the black voltage output path in advance through the multiplexer circuit. When abnormality is detected, the system can immediately switch to the pre-prepared black voltage mode, cushioning against potential panel damage without delay.
3Device complexity
If the data driver uses external control for abnormal state handling, then device complexity is reduced, but ease of operation worsens due to additional control signals needed
Solution Approach 1:
The data driver incorporates autonomous abnormal state handling capabilities directly within the driver circuitry. The lock signal monitoring circuit and multiplexer are integrated into the data driver itself, enabling it to detect and respond to abnormalities without requiring external control systems, thereby improving ease of operation.
Data Source
AI summary
A display device includes a timing controller, a data driver controlled by the timing controller, and a display panel configured to display an image by the data driver. When a data signal is applied in an abnormal state, the data driver generates a voltage for display of black by itself, and supplies the voltage to the display panel.