LCD Voltage Sampling Circuit for Liquid Crystal Polarization Prevention
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Solution Overview
Problem
Liquid crystal molecules in LCD panels can become polarized due to prolonged application of data voltages with the same polarity, leading to reduced deflection speed and amplitude, and this polarization can persist even after circuit abnormalities are resolved, especially in high-temperature environments.
Innovation Solution
An apparatus and method that includes a voltage sampling circuit and a data processing circuit to monitor and compare data and common voltages, determining if liquid crystal molecules are deflected abnormally and issuing restart or shutdown signals to the main control circuit to prevent polarization, by ensuring polarity reversal and controlling the common voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data voltages with the same polarity are applied to the pixel electrode for a long time, then the liquid crystal molecules may be polarized causing reduced deflection speed and amplitude, but continuously reversing the polarity of data voltages increases the complexity of the voltage control system
Solution Approach 1:
The patent implements a feedback mechanism by sampling the data voltage and common voltage, comparing their differences, and detecting whether liquid crystal molecules are deflected abnormally. This feedback loop enables the system to automatically adjust and restart when polarization is detected, resolving the contradiction by maintaining reliability through intelligent monitoring rather than complex continuous polarity reversal control
Solution Approach 2:
The system performs self-diagnosis by sampling and comparing voltages to detect liquid crystal polarization automatically. The restart function is self-triggered when abnormal deflection is detected, eliminating the need for external intervention or complex continuous polarity management, thus maintaining reliability without increasing system complexity
2Reliability
If the main control circuit is restarted frequently to resolve liquid crystal polarization, then the liquid crystal molecules can return to normal state, but the productivity and response time of the display device are reduced
Solution Approach 1:
The system performs preliminary detection by continuously sampling data voltage and common voltage and comparing their differences before liquid crystal polarization becomes severe. This early detection allows for timely restart actions, minimizing the impact on productivity while ensuring reliability by addressing the issue before it causes significant performance degradation
3Reliability
If the common voltage supply is stopped to prevent liquid crystal polarization, then the polarization effect is eliminated, but the display function is interrupted and productivity is reduced
Solution Approach 1:
The patent implements periodic sampling of data voltage and common voltage at specific time instants (first time instant and second time instant) with opposite polarities. This periodic detection approach allows the system to monitor for polarization conditions without continuously interrupting the common voltage supply, thus preventing polarization while maintaining display operation and productivity
Solution Approach 2:
The feedback mechanism enables the system to stop common voltage supply only when polarization is actually detected through voltage comparison, rather than continuously stopping it. This conditional response maintains productivity by keeping the display operational while providing reliability by eliminating polarization when detected
Data Source
AI summary
The present disclosure provides an apparatus and method for controlling a display module, and a display device. The apparatus for controlling the display module includes a voltage sampling circuit and a data processing circuit. The voltage sampling circuit may acquire a data voltage and a common voltage and transmit the acquired data voltage and common voltage to the data processing circuit. The data processing circuit may determine, based on the data voltage and the common voltage, whether liquid crystal molecules are deflected abnormally, and control a main control circuit to restart if the liquid crystal molecules are deflected abnormally.