Display device and electronic apparatus with 3D camera module

1. An imaging device, comprising:

at least one edge-emitting laser disposed at a backlight side of a display, wherein the at least one edge-emitting laser is configured for emitting laser light;

a beam splitting device disposed between the edge-emitting laser and the display, wherein the beam splitting device is configured for splitting the laser light emitted by the edge-emitting laser into split laser light comprising multiple randomly distributed laser beams;

an imaging module disposed at the backlight side of the display, wherein the imaging module is configured for receiving laser light reflected from the split laser light by an object that re-penetrates the display from a light-emerging side of the display, and obtaining a depth image of the object based on the reflected laser light; and

a driver circuit coupled to the edge-emitting laser and the imaging module, wherein the driver circuit is configured for:

controlling the edge-emitting laser and the imaging module to turn on or off,

increasing an optical power of the edge-emitting laser by increasing a drive current to enable the split laser light to penetrate the display from the backlight side of the display to reach the object, and to enable the laser light reflected by the object to re-penetrate the display again after being reflected by the object;

determining a pulse width amount to reduce pulse width of the edge-emitting laser to keep total pulse energy of the edge-emitting laser within a safety limit and substantially unchanged from the increased drive current; and

reducing the pulse width of the edge-emitting laser by the determined pulse width amount.

2. The imaging device of claim 1 , wherein, the imaging module is configured for obtaining a depth image of a surface of the object based on a spot pattern of the received laser light reflected by the object, the spot pattern corresponding to at least some of the randomly distributed laser beams.

3. The imaging device of claim 1 , further comprising an optical lens disposed between the beam splitting device and the display, wherein the optical lens is configured for aligning the emitted laser light.

4. The imaging device of claim 1 , wherein the imaging module is configured for obtaining a depth image of a surface of the object based on a time delay or phase shift of the received laser light reflected by the object.

5. The imaging device of claim 1 , further comprising a diffuser disposed between the beam splitting device and the display, wherein the diffuser is configured for diffusing the split laser light into a floodlight beam onto the display.

6. The imaging device of claim 1 , wherein the beam splitting device comprises a diffractive optics element.

7. The imaging device of claim 1 , further comprising a processing module, wherein:

the 3D camera module further comprises a 2D imaging module;

the 2D imaging module is configured for capturing a 2D image of the object; and

the processing module is configured for obtaining a 3D image of the object based on the depth image and the 2D image.

8. The imaging device of claim 1 , wherein an area of the display where the laser light penetrates or re-penetrates is a display area.

9. The imaging device of claim 1 , wherein the beam splitting device comprises a nanophotonic chip or a coded structured light photomask.

10. A display device, comprising a display and a 3D camera module, wherein:

the 3D camera module comprises a depth camera module disposed at a backlight side of the display;

the depth camera module comprises an edge-emitting laser, an imaging module, a driver circuit coupled to the edge-emitting laser and the imaging module, and a beam splitting device disposed between the edge-emitting laser and the display;

the edge-emitting laser is configured for emitting laser light, for the emitted laser light to penetrate the display to reach an object to be imaged;

the beam splitting device is configured for splitting the laser light emitted by the edge-emitting laser into split laser light comprising multiple randomly distributed laser beams;

the imaging module is configured for receiving laser light reflected from the split laser light by the object to be imaged that penetrates the display, and obtaining a depth image of the object to be imaged based on the reflected laser light; and

the driver circuit is configured for:

controlling the edge-emitting laser and the imaging module to turn on or off,

increasing an optical power of the edge-emitting laser by increasing a drive current to enable the split laser light to penetrate the display from the backlight side of the display to reach the object, and to enable the laser light reflected by the object to re-penetrate the display again after being reflected by the object;

determining a pulse width amount to reduce pulse width of the edge-emitting laser to keep total pulse energy of the edge-emitting laser within a safety limit and substantially unchanged from the increased drive current; and

reducing the pulse width of the edge-emitting laser by the determined pulse width amount.

11. The display device of claim 10 , wherein, the imaging module is a first imaging module;

the first imaging module is configured for obtaining a depth image of a surface of the object to be imaged based on a spot pattern of the received laser light reflected by the object to be imaged.

12. The display device of claim 11 , further comprising an optical lens disposed between the beam splitting device and the display, wherein the optical lens is configured for aligning the emitted laser light.

13. The display device of claim 10 , wherein the imaging module is a second imaging module;

the second imaging module is configured for obtaining a depth image of a surface of the object to be imaged based on a time delay or phase shift of the received laser light reflected by the object to be imaged.

14. The display device of claim 13 , further comprising a diffuser disposed between the beam splitting device and the display, wherein the diffuser is configured for diffusing the split laser light into a floodlight beam onto the display.

15. The display device of claim 10 , wherein, the beam splitting device is a diffractive optics element.

16. The display device of claim 10 , wherein:

the depth camera module comprises a processing module; the 3D camera module further comprises a 2D imaging module;

the 2D imaging module is configured for capturing a 2D image of the object to be imaged; and

the processing module is configured for obtaining a 3D image of the object to be imaged based on the depth image and the 2D image.

17. The display device of claim 10 , wherein, an area of the display corresponding to the edge-emitting laser is a display area or a non-display area.

18. The imaging device of claim 10 , wherein the beam splitting device is a nanophotonic chip or a coded structured light photomask.