Smart Thermostat Brightness Lock Using Radar and Ambient Light Sensors
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Solution Overview
Problem
Existing smart thermostats face challenges in dynamically adjusting display brightness due to shadows cast by users, leading to suboptimal viewing conditions and user discomfort, as current methods either filter transient changes in ambient light levels or fix brightness levels based on user interaction, resulting in inconsistent display brightness.
Innovation Solution
A smart thermostat system that uses an ambient light sensor and radar sensor to determine the proximity of a user, initiating a brightness lock mode that adjusts display brightness based on ambient light levels and user interaction, ensuring optimal visibility by maintaining a minimum brightness level when the user is near.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display brightness is dynamically adjusted based on ambient light levels, then the display adaptability to different lighting conditions is improved, but the display brightness becomes inconsistent and suboptimal when users are present due to shadows cast by users
Solution Approach 1:
The radar sensor detects user approach in advance before the user interacts with the thermostat. When a user is detected within the threshold distance, the system proactively locks the brightness at a predetermined level, preventing the ambient light sensor from making inappropriate brightness adjustments due to shadows or transient lighting changes.
Solution Approach 2:
The system continuously monitors both ambient light levels and user presence via radar sensor. This dual feedback mechanism allows the system to distinguish between actual environmental lighting changes and shadows caused by user presence, thereby making intelligent brightness adjustments that maintain consistency during user interactions.
2Reliability
If the display brightness is fixed based on user interaction, then the display brightness consistency is improved, but the energy consumption increases and the adaptability to different ambient lighting conditions deteriorates
Solution Approach 1:
The system employs periodic brightness adjustments based on ambient light changes only when no user is detected in proximity. When a user is present, the brightness lock is temporarily suspended, allowing the display to return to adaptive brightness control. This periodic switching between locked and adaptive modes optimizes energy consumption while maintaining brightness consistency during user interactions.
3Ease of operation
If the brightness lock mode is activated based on radar detection, then the user comfort is improved, but the device complexity increases due to additional sensors and control logic
Solution Approach 1:
The radar sensor serves multiple functions: it detects user presence for brightness lock activation, measures distance to determine appropriate brightness levels, and can potentially be used for other smart thermostat features. This multi-functionality justifies the addition of the radar sensor by maximizing its utility across different operational contexts.
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
The system provides consistent and user-friendly display brightness adjustment, minimizing shadows' impact and enhancing user comfort by maintaining adequate visibility during interactions.
Implementation Method 1
measuring, using the ambient light sensor, a plurality of ambient light level values of an environment surrounding the smart thermostat
Implementation Method 2
acquiring, from the radar sensor, radar data indicative of motion in the environment surrounding the smart thermostat
Data Source
AI summary
Features described herein pertain to smart thermostats, and more particularly, an intelligent brightness lock for smart thermostats. A smart thermostat can include a display, an ambient light sensor, and a radar sensor. Using the ambient light sensor, ambient light level values of an environment surrounding the smart thermostat can be measured. Radar data can be received from the radar sensor, and based on the radar data, a determination can be made that a distance between a person and the smart thermostat is less than a predetermined distance. In response, a brightness lock mode is started which causes content to be displayed on the display at a second brightness level that is equal to or greater than a first brightness level.