Laser projection modules and methods for detecting fracture thereof, depth cameras and electronic devices

An electronic device, comprising:

• a laser projection module comprising:
• a laser emitter, configured to emit laser light;
• an optical assembly, wherein the laser light passes through the optical assembly to form a laser pattern, wherein the optical assembly comprises:
• a collimating element, configured to collimate the laser light;
• and a diffractive element, configured to diffract the laser light collimated by the collimating element to form the laser pattern, wherein the diffractive element is provided with a transparent conductive film, a plurality of conductive electrodes is disposed on the transparent conductive film, and the plurality of conductive electrodes is configured to output an electrical signal after being energized;
• an image collector, configured to collect the laser pattern projected by the laser projection module into a target space;
• and
• a processor, configured to obtain the electrical signal, to determine whether the electrical signal is within a preset range, and to determine fracture of the diffractive element in response to the electrical signal being not within the preset range, and to process the laser pattern to obtain a depth image;
• wherein the diffractive element comprises a diffractive incident surface and a diffractive exit surface which are opposed, and the transparent conductive film is disposed on the diffractive incident surface or on the diffractive exit surface;
• wherein the plurality of conductive electrodes comprises a plurality of first diffraction conductive electrodes arranged in parallel, a plurality of second diffraction conductive electrodes arranged in parallel, and a plurality of bridging diffraction conductive electrodes;
• wherein each of the plurality of first diffraction conductive electrodes is continuous without interruption;
• wherein each of the plurality of second diffraction conductive electrodes is interrupted with the plurality of first diffraction conductive electrodes at crisscross points, and insulated from the plurality of first diffraction conductive electrodes;
• wherein each of the plurality of bridging diffraction conductive electrodes is coupled to a corresponding and interrupted second diffraction conductive electrode at breakpoints;
• wherein a diffraction insulator is provided at a crisscross position between the bridging diffraction conductive electrode and the first diffraction conductive electrode;
• and
• wherein both ends of each of the plurality of first diffraction conductive electrodes are coupled to the processor to form a conductive loop, and both ends of each of the plurality of second diffraction conductive electrodes are coupled to the processor to form a conductive loop.

A method for detecting a fracture of a laser projection module, wherein the laser projection module comprises a laser emitter, a collimating element and a diffractive element, the laser emitter is configured to emit laser light, the collimating element is configured to collimate the laser light, the diffractive element is configured to diffract the laser light collimated by the collimating element to form a laser pattern;

• a transparent conductive film is formed on the diffractive element, and a plurality of conductive electrodes is disposed on the transparent conductive film, and the plurality of conductive electrodes is configured to output an electrical signal after being energized;
• wherein the diffractive element comprises a diffractive incident surface and a diffractive exit surface which are opposed, and the transparent conductive film is disposed on the diffractive incident surface or on the diffractive exit surface;
• wherein the plurality of conductive electrodes comprises a plurality of first diffraction conductive electrodes arranged in parallel, a plurality of second diffraction conductive electrodes arranged in parallel, and a plurality of bridging diffraction conductive electrodes,
• each of the plurality of first diffraction conductive electrodes is continuous without interruption,
• each of the plurality of second diffraction conductive electrodes is interrupted with the plurality of first diffraction conductive electrodes at crisscross points, and insulated from the plurality of first diffraction conductive electrodes;
• each of the plurality of bridging diffraction conductive electrodes is coupled to a corresponding and interrupted second diffraction conductive electrode at breakpoints;
• a diffraction insulator is provided at a crisscross position between the bridging diffraction conductive electrode and the first diffraction conductive electrode;
• and
• both ends of each of the plurality of first diffraction conductive electrodes are coupled to a processor to form a conductive loop, and both ends of each of the plurality of second diffraction conductive electrodes are coupled to the processor to form a conductive loop,
• the method comprises:
• obtaining a plurality of electrical signal outputs by the conductive electrodes after being energized;
• determining whether each of the plurality of electrical signals is within a preset range;
• and
• determining the fracture of the diffractive element in response to at least one of the plurality of electrical signals being not within the preset range;
• wherein in response to two or more of the plurality of electrical signals being not within the preset range, determining whether the conductive electrodes corresponding to the two or more of the plurality of electrical signals are crisscrossed;
• wherein in response to that the conductive electrodes corresponding to the two or more of the plurality of electrical signals are crisscrossed, determining a position of the fracture based on the conductive electrodes corresponding to the two or more of the plurality of electrical signals.