Shared Light Source Circuit for TOF and Proximity Sensing
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Solution Overview
Problem
Existing terminals require a large number of components for object recognition and proximity detection functions, which hinders integration.
Innovation Solution
A light source circuit that integrates a TOF drive module and an optical proximity drive module to drive a single light source module, with switch modules and sampling control modules to control light emission, reducing the number of components needed for both functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate light source modules are used for TOF object recognition and optical proximity detection, then each function can be independently optimized, but the device complexity and component quantity increase
Solution Approach 1:
The patent merges the TOF light source module and optical proximity light source module into a single integrated light source module. The control circuit selectively activates different driving modes (TOF mode or optical proximity mode) based on the required function, thereby reducing component quantity while maintaining functional independence through software/control-based separation.
Solution Approach 2:
The integrated light source module is designed to perform multiple functions: it can operate as a TOF light source for object recognition and as an optical proximity light source for proximity detection. The control circuit enables the same physical module to serve different purposes by adjusting driving parameters and selection signals.
2Measurement precision
If the light source emits high intensity for TOF depth detection, then measurement precision improves, but eye safety and energy consumption worsen
Solution Approach 1:
The system applies partial action by using different light intensities for different functions. For optical proximity detection, a lower intensity suffices and is used to reduce eye safety concerns and energy consumption. For TOF depth detection, higher intensity is temporarily applied only when needed for accurate depth measurement, optimizing the balance between precision and safety.
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
Improves integration of terminals by sharing a single light source module for both object recognition and proximity detection, while ensuring safe and stable light emission levels.
Implementation Method 1
a light source module 102, a TOF drive module 104 and an optical proximity drive module 106, where a first end of the light source module 102 is connected to a first voltage end, an output end of the TOF drive module 104 is connected to a second end of the light source module 102, to drive the light source module 102 to emit light
Data Source
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AI summary
This application discloses a light source circuit and a terminal, and pertains to the field of circuit technologies. The light source circuit includes a light source module, a TOF drive module, and an optical proximity drive module. A first end of the light source module is connected to a first voltage end. An output end of the TOF drive module is connected to a second end of the light source module, to drive the light source module to emit light. An output end of the optical proximity drive module is connected to the second end of the light source module, to drive the light source module to emit light. At most one of the TOF drive module and the optical proximity drive module drives the light source module to emit light. In the light source circuit, the light source module may serve as a TOF light source for implementing an object recognition function, and may serve as an optical proximity light source for implementing a proximity detection function, to reduce components used when the terminal implements the object recognition function and the proximity detection function, so as to help improve integration of the terminal.