Laser driving system and method and three-dimensional sensing system

Abstract

The invention discloses a laser driving system and method and a three-dimensional sensing system. The laser driving system comprises a change-over switch, a dToF power supply module, an iToF power supply module, a pulse generation module, a laser and a transistor, the power input end of the selector switch is connected with a first power signal; the input end of the dToF power supply module is electrically connected with the first output end of the change-over switch; the input end of the iToF power supply module is electrically connected with the second output end of the change-over switch; the first pole of the laser is electrically connected with the output end of the dToF power supply module and is electrically connected with the output end of the iToF power supply module; the grid electrode of the transistor is electrically connected with the pulse signal output end of the pulse generation module; the first pole of the transistor is electrically connected with the second pole of the laser; the second electrode of the transistor is connected with a second power signal. According to the invention, the requirement of scene switching in practical application can be met.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of laser driving, and in particular to a laser driving system and method, and a three-dimensional sensing system. Background technique [0002] Time of Flight (ToF) technology obtains information such as the position and shape of objects by measuring the time delay between emitted and received infrared light, so it is widely used in 3D image acquisition and 3D sensing and other fields. [0003] There are two kinds of time-of-flight technologies, namely, indirect time of flight (Indirect Time of Flight, iToF) and direct time of flight (Direct Time of Flight, dToF), both of which modulate infrared light emission in different ways. Usually, iToF and dToF require different driving circuits for different application scenarios. The existing laser driving circuits are all driving circuits for iToF or dToF mode, and their driving mode is single, which cannot meet the needs of far and near scen...

AI Technical Summary

Problems solved by technology

The existing laser driving circuits are all driving circuits for iToF or dToF mode alone, and their driving mode is single, which cannot meet the needs of far and near scene switching in practical applications.

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