System and method for controlling laser projector, laser projector assembly and terminal

Patent metadata

Field	Value
Publication number	US-11522338-B2
Application number	US-201916688462-A
Country	US
Kind code	B2
Filing date	Nov 19, 2019
Priority date	Apr 28, 2018
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

Disclosed in embodiments of the present disclosure is a system for controlling a laser projector, a laser projector assembly, a terminal, a method for controlling a laser projector, a method for controlling a laser light output, a device for controlling a laser light output and a computer readable storage medium. The system includes a first drive circuit coupled to the laser projector. The first drive circuit is configured to output an electrical signal to drive the laser projector to project laser light and to turn off the laser projector when a duration of outputting the electrical signal is greater than or equal to a preset threshold.

First claim

What is claimed is:

1. A system for controlling a laser projector, comprising:
a first drive circuit, coupled to the laser projector and configured to output an electrical signal to drive the laser projector to project laser light, and to turn off the laser projector when a duration of outputting the electrical signal is greater than or equal to a preset threshold;
an application processor, coupled to the first drive circuit; and
a watchdog timer, coupled to the application processor and the first drive circuit respectively, and configured to receive a predetermined signal from the application processor and to turn off the first drive circuit when the predetermined signal is not received by the watchdog timer within a preset time period;
wherein the first drive circuit is configured to send a timeout signal to the application processor when the duration is greater than or equal to the preset threshold; and
wherein the application processor is configured to stop sending the predetermined signal to the watchdog timer in response to receiving the timeout signal.

2. The system of claim 1 , wherein the first drive circuit is configured to stop outputting the electrical signal when the duration is greater than or equal to the preset threshold.

3. The system of claim 1 , further comprising:
a microprocessor, coupled to the first drive circuit, and
a watchdog timer, coupled to the microprocessor and the first drive circuit respectively, and configured to receive a predetermined signal from the microprocessor, and to turn off the first drive circuit when the predetermined signal is not received by the watchdog timer within a preset time period;
wherein the first drive circuit is configured to send a timeout signal to the microprocessor when the duration is greater than or equal to the preset threshold; and
wherein the microprocessor is configured to stop sending the predetermined signal to the watchdog timer in response to receiving the timeout signal.

4. The system of claim 1 , further comprising:
a second drive circuit, coupled to the first drive circuit and configured to supply power for the first drive circuit.

5. The system of claim 1 , further comprising:
a control circuit, coupled to the first drive circuit and the laser projector respectively, the control circuit comprising a resistance element, a detection element and a switch element, wherein the detection element is coupled in series with the resistance element and the first drive circuit and configured to detect a current flowing through the resistance element, and the switch element is configured to be switched off to turn off the laser projector when the current is greater than a predetermined current value.

6. The system of claim 1 , wherein the watchdog timer is further configured to send a reset signal for restarting the application processor when the predetermined signal is not received within the preset time period.

7. A laser projector assembly, comprising:
a laser projector;
a first drive circuit, coupled to the laser projector, and configured to output an electrical signal to drive the laser projector to project laser light, and to turn off the laser projector when a duration of outputting the electrical signal is greater than or equal to a preset threshold;
an application processor, coupled to the first drive circuit, and
a watchdog timer, coupled to the application processor and the first drive circuit respectively, and configured to receive a predetermined signal from the application processor and to turn off the first drive circuit when the predetermined signal is not received by the watchdog timer within a preset time period;
wherein the first drive circuit is configured to send a timeout signal to the application processor when the duration is greater than or equal to the preset threshold; and
wherein the application processor is configured to stop sending the predetermined signal to the watchdog timer in response to receiving the timeout signal.

8. The laser projector assembly of claim 7 , wherein the first drive circuit is configured to stop outputting the electrical signal when the duration is greater than or equal to the preset threshold.

9. The laser projector assembly of claim 7 , further comprising:
a second drive circuit, coupled to the first drive circuit and configured to supply power for the first drive circuit.

10. The laser projector assembly of claim 7 , further comprising:
a control circuit, coupled to the first drive circuit and the laser projector respectively, the control circuit comprising a resistance element, a detection element and a switch element, wherein the detection element is configured to detect a current flowing through the resistance element, and the switch element is configured to be switched off to turn off the laser projector when the current is greater than a predetermined current value.

11. A method for controlling a laser projector, the laser projector being coupled to a first drive circuit, and the method comprising:
outputting, by the first drive circuit, an electrical signal to drive the laser projector to project laser light;
turning off the laser projector when a duration of outputting the electrical signal is greater than or equal to a preset threshold;
receiving a predetermined signal from an application processor;
turning off the first drive circuit when the predetermined signal is not received within a preset time period;
sending, by the first drive circuit, a timeout signal to the application processor when the duration is greater than or equal to the preset threshold; and
stopping sending, by the application processor, the predetermined signal to a watchdog timer when the timeout signal is received by the application processor.

12. The method of claim 11 , wherein turning off the laser projector when the duration of outputting the electrical signal is greater than or equal to the preset threshold comprises:
stopping outputting the electrical signal when the duration is greater than or equal to the preset threshold.

13. The method of claim 11 , further comprising:
receiving a predetermined signal from a microprocessor;
turning off the first drive circuit when the predetermined signal is not received within a preset time period;
sending, by the first drive circuit, a timeout signal to the microprocessor when the duration is greater than or equal to the preset threshold; and
stopping sending, by the microprocessor, the predetermined signal to a watchdog timer when the timeout signal is received by the microprocessor.

14. The method of claim 11 , further comprising:
detecting a current flowing through the first drive circuit; and
controlling to turn off the laser projector when the current is greater than a predetermined current value.

15. The method of claim 11 , further comprising:
sending a reset signal for restarting the application processor when the predetermined signal is not received within the preset time period.

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Lyu Xiangnan
• Bai Jian
• Chen Biao
• Guo Ziqing
• Tan Guohui
• Zhou Haitao

Classifications

• H01S5/0428 Primary

  for applying pulses to the laser · CPC title

• G06F1/04

  Generating or distributing clock signals or signals derived directly therefrom · CPC title

• G06V40/16

  Human faces, e.g. facial parts, sketches or expressions · CPC title

• G01B11/25

  by projecting a pattern, e.g. {one or more lines,} moiré fringes on the object (G01B11/255 takes precedence {; image analysis for depth or shape recovery G06T7/50}) · CPC title

• G06F1/1686 Primary

  the I/O peripheral being an integrated camera · CPC title