Integrated LCD Temperature Sensing via Seebeck Effect
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Solution Overview
Problem
Current liquid crystal display (LCD) manufacturing processes face challenges with external temperature detection limitations, leading to inadequate detection precision and increased production costs due to short circuits and potential panel burning, which can result in quality risks and yield decreases.
Innovation Solution
A temperature sensing system integrated within the LCD panel, comprising a sensing unit with two different metal conductors and a calculation and control unit, utilizes the Seebeck effect to generate a voltage difference that is amplified and converted into a digital signal to accurately detect temperature changes, enabling self-protection against overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external temperature detection components are used, then the detection coverage is limited to specific positions, but the detection precision is insufficient for arbitrary positions inside the entire liquid crystal display panel
Solution Approach 1:
The temperature sensing function is segmented and distributed to multiple sensing units across different regions of the LCD panel. Each sensing unit independently monitors temperature at its specific location, enabling both high precision at each point and broad coverage across the entire panel through the collective action of multiple segmented sensing elements.
Solution Approach 2:
The temperature detection capability is extended from external single-point measurement to internal multi-point measurement by integrating sensing units within the panel structure. This dimensional transition from external to internal placement enables comprehensive temperature monitoring across the entire panel area with high precision at each sensing location.
2Ease of manufacture
If high integration manufacture process is conducted to reduce production cost, then the production cost decreases, but the risk of short circuit and panel burning increases
Solution Approach 1:
Temperature sensing units are integrated into the LCD panel during the manufacturing process before the panel is assembled and deployed. This preliminary integration allows for early detection of short circuit conditions and temperature anomalies, enabling preventive actions to be taken before failures occur, thereby maintaining reliability while preserving the cost benefits of high integration manufacturing.
Solution Approach 2:
The sensing units continuously monitor temperature conditions within the LCD panel and provide feedback signals when abnormal temperature rises or short circuit conditions are detected. This feedback mechanism enables real-time monitoring and early warning, allowing for immediate corrective actions to prevent panel burning while maintaining the cost-effectiveness of integrated manufacturing processes.
3Measurement precision
If external temperature detection is used, then the detection setup is simple, but the detection precision and response speed to internal temperature changes are insufficient
Solution Approach 1:
The temperature sensing units are merged with the existing LCD panel structure and manufacturing processes. The sensing units utilize the same fabrication techniques and materials already employed in LCD production, integrating temperature detection functionality directly into the panel without requiring separate external detection systems. This merging approach achieves high detection precision while minimizing additional system complexity.
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
This solution allows for precise temperature monitoring inside the LCD panel, preventing overheating and burning, thereby enhancing production yield and reducing costs by detecting short circuits effectively.
Implementation Method 1
utilizes the Seebeck effect to generate a voltage difference
Data Source
AI summary
The present invention provides a temperature sensing system integrated in a liquid crystal display panel and a liquid crystal display panel. The temperature sensing system includes a sensing unit (11), located in a display region (1) of the liquid crystal display panel, and a calculation and control unit (12), located outside the display region (1); the sensing unit (11) includes a first metal conductor (A) and a second metal conductor (B) located in the display region (1), and as a short circuit point exists between the two, a voltage difference generates between the two, and the voltage difference is converted into a digital signal with an analog to digital converter (122) after it is amplified by an operational amplifier (121), and finally, the micro controller unit (123) processes the digital signal to obtain a temperature in the liquid crystal display panel and to determine whether the protect temperature is reached.