Thin-Film Semiconductor Temperature Sensor for LCD Noise Reduction
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Solution Overview
Problem
Existing temperature measurement methods for liquid crystal displays, both external and internal, face challenges in accurately measuring the temperature of the liquid crystal layer due to noise issues and varying semiconductor materials, leading to inaccurate temperature sensing and control.
Innovation Solution
A thin-film semiconductor device with a temperature sensor and a current-voltage converter on the same substrate, where the temperature-dependent current from the sensor is converted to a voltage by the converter, utilizing regions with temperature-independent characteristics to achieve accurate temperature monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a temperature sensor is placed outside the liquid crystal display, then the device complexity is reduced, but the measurement precision deteriorates because the temperature of the liquid crystal part cannot be correctly identified
Solution Approach 1:
The patent merges the temperature sensor with the liquid crystal display by forming the sensor on the same substrate as the liquid crystal layer. This integration allows direct measurement of the liquid crystal temperature while maintaining a compact structure. The temperature sensor and liquid crystal are fabricated together using the same substrate, eliminating the need for separate external sensors and achieving both low device complexity and high measurement precision.
2Object-affected harmful factors
If a current source is formed on the same substrate as the temperature sensor, then noise from external apparatus is eliminated, but temperature sensing becomes difficult because the current change cancels the temperature change
Solution Approach 1:
The patent applies local quality by creating different functional regions on the substrate: a temperature sensor region that is highly sensitive to temperature changes and a constant current source region that provides stable current. The temperature sensor is designed with specific structural characteristics (such as thin-film diode or transistor configurations) that allow it to detect temperature while the constant current source is designed to provide stable excitation current. This local differentiation enables simultaneous achievement of low noise and accurate temperature sensing.
3Ease of manufacture
If thin-film semiconductors are used to form the temperature sensor, then manufacturing ease is improved, but measurement precision deteriorates because the pn junction part cannot be satisfactorily formed
Solution Approach 1:
The patent applies parameter changes by optimizing the fabrication parameters and structural characteristics of the thin-film semiconductor temperature sensor. This includes adjusting the thickness of the thin-film layer, modifying the doping concentration, optimizing the gate voltage, and tuning other electrical parameters to achieve the desired temperature sensitivity and measurement precision while maintaining the ease of manufacture advantage of thin-film technology.
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 configuration allows for precise temperature monitoring and control, enabling satisfactory image reproduction across a wide temperature range by adjusting driving voltage and light source methods, thereby improving the accuracy and reliability of temperature sensing in liquid crystal displays.
Implementation Method 1
a temperature sensor made of a thin-film semiconductor and sensing a temperature as current
Implementation Method 2
a current-voltage converter made of a thin-film semiconductor and having temperature dependence in which its current-voltage characteristic is different from that of the temperature sensor
Data Source
AI summary
A thin-film semiconductor device comprises a temperature sensor formed of a thin-film semiconductor and sensing a temperature as current, and a current-voltage converter formed of a thin-film semiconductor and having temperature dependence in which its current-voltage characteristic is different from that of the temperature sensor. A temperature sensed by the temperature sensor is converted to a voltage by the current-voltage converter.