LCD Temperature Estimation Using Single Sensor and Stored Correlation
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in accurately detecting temperature variations across different areas of the liquid crystal panel, leading to inefficiencies in temperature control, as using a similar number of temperature sensors as areas increases costs without significantly improving accuracy.
Innovation Solution
A liquid crystal display device employing a single temperature sensor and a controller with stored temperature relation information, using relation formulas and coefficients to estimate temperatures across multiple areas, with processes differentiated based on steady-state and transient periods, and incorporating a backlight unit and circuit boards to enhance temperature correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the same number of temperature sensors as areas are used, then the temperature detection accuracy of each area is improved, but the cost of the liquid crystal display device is increased
Solution Approach 1:
The liquid crystal panel is divided into multiple areas (first area near light source, second area away from light source), and different temperature estimation methods are applied to each area based on their thermal characteristics. This segmentation allows accurate temperature monitoring of each area using a single temperature sensor placed in the first area.
Solution Approach 2:
A temperature estimation unit acts as an intermediary that uses stored temperature relation information (correlation data between temperature sensor output and actual panel temperatures) to estimate the temperatures of both areas. This intermediary processing enables accurate temperature estimation without requiring physical temperature sensors in each area.
2Quantity of substance
If a single temperature sensor is used, then the cost is reduced, but the ability to detect temperature variations across different areas is insufficient
Solution Approach 1:
Temperature relation information is stored in advance in the storage unit, representing the correlation between the temperature sensor output and the actual temperatures of different panel areas under various conditions. This preliminary preparation of correlation data enables accurate temperature estimation when only a single temperature sensor is used.
Solution Approach 2:
The system changes the parameter representation from direct physical measurement (multiple sensors) to calculated estimation based on stored correlation parameters. The temperature estimation unit uses the stored temperature relation information to calculate and estimate temperatures of different areas, transforming the approach from direct measurement to parameter-based estimation.
3Measurement precision
If multiple temperature sensors are deployed to capture temperature variations, then the temperature control accuracy is improved, but the device complexity is increased
Solution Approach 1:
The single temperature sensor placed in the first area serves multiple functions: it directly measures the temperature of the first area (near the light source) and indirectly provides data for estimating the temperature of the second area (away from the light source) through the stored temperature relation information. This multi-functionality eliminates the need for multiple sensors while maintaining temperature control accuracy.
Solution Approach 2:
The temperature estimation unit continuously estimates temperatures of both areas based on the temperature sensor output and stored relation information, enabling feedback control for gray-scale correction. This feedback mechanism ensures accurate temperature control without requiring complex multi-sensor arrangements.
Data Source
AI summary
On a liquid crystal panel, plural areas whose number is larger than that of temperature sensors are defined. In a memory, temperature relation information representing a relation between an output value of a temperature sensor and a temperature of each of the plural areas is stored. A controller acquires the output value of the temperature sensor and estimates, based on the temperature relation information and the acquired output value, the temperature of each of the plural areas. According to this configuration, the temperature of each of the plural areas defined on the liquid crystal panel can be obtained with a small number of temperature sensors.