TOF Sensing Module with Shared IR Light Source for Space Saving
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Solution Overview
Problem
The independent disposition of proximity light sensors and TOF sensors in electronic devices occupies significant space and increases design complexity.
Innovation Solution
A TOF sensing module that multiplexes infrared light sources to provide both TOF and proximity light functions, reducing the number of light sources and integrating control mechanisms to minimize device size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If proximity light sensor and TOF sensor are independently disposed, then both functions can be implemented, but device space is occupied and design complexity increases
Solution Approach 1:
The patent merges the proximity light sensor and TOF sensor into a single integrated sensing module. The light source assembly emits infrared light that serves both proximity detection and TOF measurement functions simultaneously, eliminating the need for separate independent sensor dispositions and reducing overall device complexity
Solution Approach 2:
The integrated sensing module implements multi-functionality where a single light source assembly and sensor system perform multiple functions: proximity detection for screen-off control and TOF measurement for 3D imaging and depth detection. This universal design reduces the number of components while maintaining both functional capabilities
2Adaptability or versatility
If multiple light sources are used for proximity and TOF functions, then both functions can be implemented, but hardware cost increases
Solution Approach 1:
The light source assembly is designed to serve dual purposes: providing infrared light for proximity detection and for TOF measurement. By making the light source universal rather than having separate dedicated light sources for each function, the patent reduces the total quantity of light source components required
Solution Approach 2:
The patent combines the light source requirements for both proximity and TOF functions into a single integrated light source assembly, reducing component quantity and hardware cost while maintaining the capability to perform both functions
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 solution allows for simultaneous implementation of TOF and proximity light functions while reducing hardware costs and saving space within the electronic device.
Implementation Method 1
a light source, configured to emit first infrared light and second infrared light to a target object
Implementation Method 2
the TOF sensor is widely used in three-dimensional (3D) imaging technology. A working principle of the TOF sensor is to continuously emit infrared light to the object. After the infrared light is reflected back to the sensor by the object, the sensor can calculate a distance between the sensor and the object based on a time difference between emission and reception
Implementation Method 3
After the infrared light is reflected back to the sensor by the object, the sensor can calculate a distance between the sensor and the object based on a time difference between emission and reception
Data Source
AI summary
Embodiments of this application provide a TOF sensing module and an electronic device. The TOF sensing module includes: a light source, configured to provide first infrared light and second infrared light for a target object; and a drive control unit, connected to a control end of the light source, and configured to drive, when the electronic device uses a TOF function, the light source to provide the first infrared light for the target object and when the electronic device uses a proximity light function, the light source to provide the second infrared light for the target object. Through timing control, infrared light is provided for a TOF sensor and the proximity light sensor respectively through the light source, so that a quantity of light sources in a conventional proximity light sensor is reduced. This is conducive to reducing a quantity of used devices, saving internal space of the electronic device.