Ambient Temperature Correction Using Display Driver Power Monitoring
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Solution Overview
Problem
Temperature sensors in electronic devices often provide inaccurate ambient temperature measurements due to the proximity of heat-generating components, which complicates thermal insulation and affects measurement accuracy, especially in compact devices.
Innovation Solution
The method involves measuring or estimating the power consumption of heat-generating components like the display driver and processor core to determine a correction factor for the ambient temperature measurement, allowing for accurate temperature correction within a predefined error tolerance by using established heating models and lookup tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal insulation is employed to isolate the temperature sensor from heat generating components, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the temperature sensor from the hot environment by placing it in a thermally isolated location within the device housing, away from heat-generating components. This physical separation allows the sensor to measure ambient temperature without direct thermal interference, improving measurement precision while avoiding complex insulation structures.
Solution Approach 2:
The patent introduces thermal insulation material as an intermediary between the temperature sensor and heat-generating components. This mediator blocks heat transfer paths, allowing the sensor to accurately measure ambient temperature while the device maintains its compact form factor without requiring complex thermal management structures.
2Device complexity
If the temperature sensor is placed close to heat generating components, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The temperature sensor is extracted from the thermal influence zone of heat-generating components by positioning it in a thermally isolated region of the device housing. This extraction maintains simple device architecture while ensuring the sensor measures true ambient temperature without being heated by internal components.
Solution Approach 2:
The patent applies local thermal isolation by creating a specific thermally isolated region within the device housing where the temperature sensor is positioned. This localized approach provides the necessary thermal protection without requiring insulation throughout the entire device, maintaining manufacturing simplicity while achieving accurate measurements.
3Measurement precision
If thermal insulation is added to isolate the temperature sensor, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The temperature sensor is positioned in a pre-designed thermally isolated region of the device housing, eliminating the need for complex post-assembly insulation installation. This extraction approach simplifies manufacturing by integrating thermal isolation into the housing design rather than adding separate insulation components.
Solution Approach 2:
The patent implements localized thermal isolation using simple insulation materials placed in specific regions around the temperature sensor. This approach provides effective thermal protection while maintaining ease of manufacture, as the insulation can be easily integrated into the housing structure during standard manufacturing processes.
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 approach effectively corrects ambient temperature measurements to within ±1° C. of the actual temperature, improving accuracy and reducing manufacturing complexity by accounting for the impact of internal heat sources.
Implementation Method 1
An ambient temperature of an environment is measured by a temperature sensor of the electronic device
Implementation Method 2
Measurements made by the temperature sensor can be affected by heat from the heat generating electronic components
Data Source
AI summary
This application is directed to a method for correct temperature measurement. An electronic device includes a temperature sensor that measures an ambient temperature of an environment and a display that is driven by a display driver. The electronic device determines a brightness setting of the display, estimates a display driver current based on the brightness setting, estimates a driver efficiency of the display driver based on the display driver current, and combines a predetermined display driver voltage, the display driver current, and the driver efficiency to determine a power consumption of the display driver. An ambient temperature correction is determined in accordance with the determined power consumption of the display driver, and the measured ambient temperature is thereby corrected using the ambient temperature correction. In some implementations, a power consumption of a distinct heat-generating electronic component is also monitored for adjusting the ambient temperature correction.