Voltage Supply Circuit Anomaly Detection for Liquid Crystal Panels
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Solution Overview
Problem
Existing liquid crystal devices face anomalous display issues due to inadequate voltage application, particularly the burn-in phenomenon caused by shifts in common voltage, which has not been effectively detected by existing techniques.
Innovation Solution
A voltage supply circuit that includes a common voltage generation circuit, an input terminal for detecting the voltage of the common electrode, and determination circuits to assess whether the detected voltage is within normal ranges, allowing for the identification of anomalies in both the liquid-crystal panel and the common voltage generation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing anomaly detection techniques are used to detect scan signals and data signals, then anomalous display caused by signal issues can be detected, but burn-in phenomenon caused by common voltage shifting cannot be detected
Solution Approach 1:
The anomaly detection function is segmented into multiple independent determination circuits: a first determination circuit for detecting anomalies in the liquid-crystal panel, and a second determination circuit for detecting anomalies in the common voltage generation circuit. This segmentation allows each circuit to specialize in detecting specific types of anomalies, thereby expanding overall detection coverage while maintaining reliable detection capabilities.
Solution Approach 2:
The voltage supply circuit is designed with multi-functionality by integrating both panel anomaly detection and common voltage anomaly detection capabilities. The circuit can detect both traditional scan/data signal anomalies and the previously undetectable burn-in phenomenon caused by common voltage shifting, making the detection system universally applicable to multiple failure modes.
2Use of energy by moving object
If the liquid-crystal panel is driven with inadequate voltage, then power consumption is reduced, but anomalous display and burn-in phenomenon occur
Solution Approach 1:
The voltage supply circuit incorporates feedback mechanisms through determination circuits that continuously monitor the common voltage and detection voltage. When an anomaly is detected (indicating inadequate voltage that could cause burn-in), the system can respond by adjusting the voltage supply to maintain proper display quality and prevent damage, thus resolving the contradiction between power consumption and reliability.
Solution Approach 2:
The determination circuits perform anomaly detection before burn-in damage occurs. By detecting shifts in common voltage that precede actual burn-in phenomena, the system can take preventive action to maintain adequate voltage levels, cushioning against the harmful effects of voltage inadequacy before they manifest as permanent damage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately detects anomalies in the liquid-crystal panel and common voltage generation circuit, preventing burn-in and ensuring proper display quality by determining if the detection voltage falls within specified reference voltage ranges.
Implementation Method 1
The common voltage generation circuit is configured to generate the common voltage based on a result of comparison between a voltage obtained by voltage-dividing the common voltage at a predetermined voltage dividing ratio and a constant voltage
Implementation Method 2
a third determination circuit that determines that the detection voltage is normal if a voltage obtained by voltage-dividing the detection voltage input to the input terminal at the predetermined voltage dividing ratio is less than or equal to the third reference voltage and greater than or equal to the fourth reference voltage
Data Source
AI summary
A voltage supply circuit that supplies a voltage to a liquid-crystal panel (10) including a common electrode (30) common to a plurality of pixels is provided with a common voltage generation circuit (310) that generates a common voltage (VCOM) to be supplied to the common electrode 30, an output terminal (320) from which the common voltage (VCOM) is output to the liquid-crystal panel (10), an input terminal (360) to which a voltage of the common electrode (30) detected in the liquid-crystal panel (10) is input as a detection voltage (VCOM_IN), and a first determination circuit (353) that determines whether or not the detection voltage (VCOM_IN) input to the input terminal (360) is normal.