Irradiation device and method for using the same

1. An irradiation device, comprising:

a light source, which is a light source with an adjustable light emitting wavelength, configured to emit visible light for a first time period and to emit ultraviolet light for a second time period;

an optical switch element comprising:

a light shielding part which is a liquid crystal display panel; and

a control circuit, which is a liquid crystal display control circuit, communicatively connected to an image recognition module and the light shielding part, respectively, and is configured to control the light shielding part to partly shield light emitted by the light source according to a contour of a target area such that a contour of an irradiation area formed by a part of the light emitted by the light source which is not shielded by the light shielding part matches with the contour of the target area, by controlling a part of an area of the liquid crystal display panel to be displayed transparently and other parts of the area to be displayed in black according to the contour of the target area, wherein the transparently displayed area matches with the target area; and

an image recognition module communicatively connected to the optical switch element and comprising:

a first image acquisition module configured to acquire a first image comprising the target area in the second time period and acquire a second image comprising the irradiation area and the target area in the first time period; and

an image processing module configured to recognize the target area from the first image, determine and recognize the contour of the target area, and provide the contour of the target area to the optical switch element, and further configured to recognize the irradiation area and the target area from the second image, determine the contour of the irradiation area, and compare a position of the contour of the target area with a position of the contour of the irradiation area to determine whether they correspond to each other, and if not, adjust the optical switch element to control the contour of the irradiation area to match with the contour of the target area according to the position of the contour of the target area and the position of the contour of the irradiation area,

wherein the light source and the target area are located on different sides of the light shielding part.

2. The irradiation device according to claim 1 , wherein a maximum light shielding area of the light shielding part corresponds to a maximum light emitting surface of the light source.

3. The irradiation device according to claim 1 , wherein the light shielding part is a display panel, which comprises a pixel array substrate and a photorefractive crystal layer.

4. The irradiation device according to claim 1 , further comprising: a beam expansion and collimation mechanism disposed between the light source and the light shielding part and configured to convert linear light emitted by the light source into surface light.

5. The irradiation device according to claim 1 , wherein the first image acquisition module is located on a central light path of the light source, and the first image acquisition module is located away from an emitting light path of the light source when light is emitted by the light source.

6. The irradiation device according to claim 1 , further comprising:

a second image acquisition module configured to acquire a third image comprising the irradiation area,

wherein the first image acquisition module is further configured to acquire a fourth image currently comprising the target area; and

wherein the image processing module is configured to recognize the irradiation area from the third image, determine a contour of the irradiation area, recognize the target area from the fourth image, determine a contour of the target area, compare the contour of the target area with the contour of the irradiation area to determine whether they correspond to each other, and if not, adjust the optical switch element to control the contour of the irradiation area to match with the contour of the target area according to the contour of the target area and the contour of the irradiation area.

7. The irradiation device according to claim 6 , wherein the second image acquisition module comprises:

a first camera; and

a first optical filter disposed on an external light incident side of the first camera,

wherein the first camera is configured to capture the third image through the first optical filter.

8. The irradiation device according to claim 7 , wherein the first image acquisition module comprises a second camera, and the first camera and the second camera are located on two sides of a central light path of the light source, respectively, and have their shooting angles to be mirror symmetrical with respect to the central light path of the light source.

9. A method for using the irradiation device according to claim 1 , comprising:

recognizing, by the image recognition module, the contour of the target area and providing the contour of the target area to the optical switch element; and

controlling, by the optical switch element, the light source, so that the contour of the irradiation area of the light source matches with the contour of the target area.

10. The method according to claim 9 , wherein controlling, by the optical switch element, the light source, so that the contour of the irradiation area of the light source matches with the contour of the target area comprises:

controlling a part of an area of a liquid crystal display panel to be displayed transparently and other parts of the area of the liquid crystal display panel to be displayed in black, wherein the transparently displayed area corresponds to an area within the contour of the target area.

11. The method according to claim 9 , wherein recognizing, by the image recognition module, the contour of the target area and providing the contour of the target area to the optical switch element comprises:

acquiring, by a first image acquisition module, a first image comprising the target area; and

recognizing, by an image processing module, the target area from the first image, determining the contour of the target area and providing the contour of the target area to the optical switch element.

12. The method according to claim 11 , wherein after controlling, by the optical switch element, the light source, so that the contour of the irradiation area of the light source matches with the contour of the target area, the method further comprises:

emitting, by the light source, visible light;

acquiring, by the first image acquisition module, a second image comprising the irradiation area and the target area, and

recognizing, by the image processing module, the irradiation area from the second image, determining the contour of the irradiation area, recognizing the target area, determining the contour of the target area, and comparing a position of the contour of the target area with a position of the contour of the irradiation area to determine whether they correspond to each other, and if not, adjusting the optical switch element to control the contour of the irradiation area to match with the contour of the target area according to the position of the contour of the target area and the position of the contour of the irradiation area.

13. The method according to claim 11 , wherein after controlling, by the optical switch element, the light source, so that the contour of the irradiation area of the light source matches with the contour of the target area, the method further comprises:

acquiring, by a second image acquisition module, a third image comprising the irradiation area;

acquiring, by the first image acquisition module, a fourth image currently comprising the target area; and

recognizing, by the image processing module, the irradiation area from the third image, determining the contour of the irradiation area, recognizing the target area from the fourth image, determining the contour of the target area, comparing the contour of the target area with the contour of the irradiation area to determine whether they match with each other, and if not, adjusting the optical switch element to control the contour of the irradiation area to match with the contour of the target area.