Reflective LCD Pixel Temperature Sensor Integration
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Solution Overview
Problem
Conventional liquid crystal display apparatuses face challenges in accurately measuring pixel temperature due to the placement of temperature sensors, which are often separated from the pixels by a glass cover and a heatsink, resulting in a temperature error of -5° C. to +5° C.
Innovation Solution
A reflective liquid crystal display apparatus with a temperature sensor integrated into one or more regions among the pixel regions, using a dummy pixel with a temperature sensor formed in its circuit unit to accurately detect pixel temperature, allowing for real-time and precise temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature sensor is disposed away from the pixel (on the heatsink side), then the pixel can be covered with glass and heatsink for protection and heat dissipation, but the temperature measurement accuracy deteriorates with an error of -5°C to +5°C
Solution Approach 1:
The temperature sensor is merged with the pixel structure by being formed within the pixel circuit unit, specifically utilizing the space between the source electrode and drain electrode. This integration allows the sensor to be in direct thermal contact with the pixel while the pixel remains covered with glass and heatsink for protection and heat dissipation, thereby maintaining both pixel reliability and temperature measurement accuracy.
2Measurement precision
If the temperature sensor is integrated into the pixel structure, then the temperature measurement accuracy improves, but the pixel structure complexity increases
Solution Approach 1:
The pixel circuit unit is designed to serve multiple functions: it contains the switching transistors for pixel operation, the liquid crystal display element for image display, and the temperature sensor for thermal detection. By making the pixel circuit unit multi-functional, the temperature sensor is integrated without requiring additional separate structures, thus improving measurement accuracy while minimizing increases in device complexity.
Solution Approach 2:
The pixel circuit unit's existing structural space (between source and drain electrodes) is utilized to house the temperature sensor. This self-service approach allows the pixel structure to accommodate the sensor using its own internal space rather than requiring external additions, thereby reducing the overall complexity increase.
Data Source
AI summary
According to one embodiment, a reflective liquid crystal display apparatus includes a plurality of pixels and a temperature sensor. Further, the temperature sensor included in the reflective liquid crystal display apparatus is formed in one or more regions among a plurality of pixel regions partitioned into rows and columns. The reflective liquid crystal display apparatus can thereby measure the temperature of the pixels more accurately at real time compared with the case of using a temperature sensor attached onto a heatsink.