Ambient Temperature Estimation Using Dual Sensor Correlation
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Solution Overview
Problem
Conventional display devices face challenges in accurately detecting ambient temperature due to heat generated by the device itself, leading to inaccuracies in gamma characteristics and gradation representation, especially when temperature compensation is required without the practicality of placing temperature sensors in heat-influenced positions.
Innovation Solution
The implementation of two or more temperature sensors in different positions within the display device, along with specification and estimation means to determine ambient temperature based on their correlation, allowing for accurate estimation even in thermally transition states without the need for sensors not influenced by device heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is disposed inside the display panel to measure the display panel temperature, then the measurement precision is improved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent introduces an intermediary approach by using temperature sensors positioned outside the display panel (on the backlight unit or surrounding structures) to indirectly measure the display panel temperature. The control unit then calculates the display panel temperature by adding a predetermined temperature difference value to the measured outside temperature, thus avoiding direct sensor placement inside the panel while maintaining measurement accuracy
Solution Approach 2:
The patent creates a thermal model that copies the relationship between outside temperature and display panel temperature. By measuring the outside temperature and applying a predetermined temperature difference (established during calibration), the system replicates the effect of direct internal measurement without the complexity of internal sensor installation
2Ease of manufacture
If a temperature sensor is disposed outside the display panel to avoid heat influence, then the ease of manufacture is improved, but the measurement precision deteriorates due to inability to accurately detect ambient temperature
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the outside temperature and uses it to calculate and adjust the display panel temperature in real-time. This feedback loop ensures that even though the sensor is outside the panel, the system maintains accurate temperature compensation by continuously updating the temperature value based on the measured outside temperature and the predetermined temperature difference
Solution Approach 2:
The patent changes the measurement parameter from direct display panel temperature to outside temperature plus predetermined temperature difference. This parameter transformation allows the system to use easily accessible outside temperature measurements while still achieving accurate display panel temperature compensation through the added temperature difference value
3Ease of operation
If temperature compensation is performed using outside temperature, then the ease of operation is improved, but the manufacturing precision deteriorates due to gamma characteristics variation
Solution Approach 1:
The patent performs preliminary calibration during the manufacturing process to establish the predetermined temperature difference value specific to each display panel. This preliminary action stores the relationship between outside temperature and actual display panel temperature in advance, allowing the system to achieve precise gamma characteristics compensation during operation without complex real-time adjustments
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 method enables precise ambient temperature estimation, ensuring accurate gamma characteristics and gradation representation in both stable and transition states, without the need for additional, heat-uninfluenced sensor placements, thus improving temperature compensation and color reproducibility.
Implementation Method 1
two or more temperature sensors disposed in different positions
Implementation Method 2
specification means configured to specify correlation information indicating a correlation between temperatures detected by the temperature sensors
Data Source
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AI summary
There are provided a display device which can accurately estimate an ambient temperature around the display device, a computer program, a recording medium, and a method for estimating an ambient temperature. A panel temperature sensor 10 and a switch board temperature sensor 20 are disposed in different positions of a display device 100. A control unit 30 specifies correlation information indicating the correlation between a first temperature difference ΔTp between a temperature Tp detected by the panel temperature sensor 10 and an ambient temperature Te, and a second temperature difference ΔTs between a temperature Ts detected by the switch board temperature sensor 20 and the ambient temperature Te. The control unit 30 estimates the ambient temperature Te on the basis of the specified correlation information and the temperatures Tp and Ts detected by the panel temperature sensor 10 and the switch board temperature sensor 20.