WO2018176613A1

WO2018176613A1 - Infrared projection system

Info

Publication number: WO2018176613A1
Application number: PCT/CN2017/085730
Authority: WO
Inventors: 高志强; 杨伟樑; 赵远; 宁曼莹
Original assignee: 广景视睿科技（深圳）有限公司
Priority date: 2017-03-30
Filing date: 2017-05-24
Publication date: 2018-10-04
Also published as: CN106990651A

Abstract

An infrared projection system, comprising: a projection module for generating interactive images and infrared light; a camera module (600) for chronologically acquiring the interactive images and infrared light projected by the projection module; and a projection area (700) for projecting the interactive images and infrared light. The projection module comprises: an LED light source unit (300); an infrared light source unit (200); a light combining unit (100) for combining the light emitted by the LED light source unit (300) and the infrared light source unit (200); an image display unit (400) for generating projection images; and a lens (500) for receiving the images which come from the image display unit (400) and reflected by the light combining unit (100). The light combining unit (100) comprises a prism group and a lens group for transmitting and reflecting the light emitted by the LED light source unit (300) and the infrared light source unit (200) and then allowing the light to be incident into the image display unit (400) for convergence. By combining the light of the LED light source and the infrared light source, the present invention achieves human-machine interactive operations, without providing an external infrared device.

Description

Infrared projection system

Technical field

The invention relates to the field of projection display technology and human-computer interaction, and in particular to an infrared projection system.

Background technique

Most of the current miniature projection optomes use DLP technology from Texas Instruments, and their main image and light control devices are generally referred to as DMD light modulators. It is a micro-mirror array with extremely high reflectivity. It needs to be combined with the illumination optics and projection optics to convert the commonly used RGB three primary colors into a projection image that is easy for us to see. A commonly used method of combining an illumination optical system and a projection optical system is to use a total internal reflection element having a lens surface.

At present, the common human-computer interaction implementation scheme is to use an ordinary incandescent light source projector to project an image, an infrared light source to illuminate the screen, and an infrared camera to capture the screen infrared image, thereby capturing the user's finger movement on the screen. To achieve human-computer interaction. However, the whole system is too complicated in this way, and the infrared light source needs to be debugged during use, and the correction is repeated, and the brightness of the incandescent light source is far from satisfactory.

Combining the above combination of the infrared light source and the projection light source, the projection device and the camera device are integrated into one body, which not only simplifies the system, but also makes the operation brightness simple and enables the projection brightness to meet certain requirements.

Summary of the invention

The object of the present invention is to provide a projection system that integrates a projection picture and infrared light and a projection device and an imaging device as a module according to the deficiencies of the prior art, which simplifies the structural composition of the interactive system and makes the operation easier. .

To achieve the above object, the present invention provides the following technical solutions:

An infrared projection system comprising: an image system for generating an interactive image and an infrared light projection; a camera module for sequentially acquiring an interactive image and infrared light projected by the projection module; and a projection for projecting the interactive image and the infrared light a region; wherein the projection module comprises: an LED light source unit; an infrared light source unit; a light combining unit for combining the light source emitted by the LED light source unit and the infrared light source unit; and an image display unit for generating a projected image; a lens for receiving an image reflected by the image display unit via the light combining unit; wherein the light combining unit includes a light source for transmitting and reflecting the light source emitted by the LED light source unit and the infrared light source unit and incident on the image display unit Prism group and lens group.

Claims

Preferably, the infrared light source unit and the LED light source unit are respectively located on different sides of the light combining unit, and the light of the LED light source unit reaches the image display unit through the reflection of the lens group and the transmission of the prism group, and the infrared light source The infrared light of the unit sequentially transmits the lens group and the prism group to the image display unit.

Preferably, a gap is provided between the prism group and the lens group, and faces close to each other are flat.

Preferably, said set of prisms comprises one or more prisms.

Preferably, the lens group comprises one or more lenses.

Preferably, the lens group comprises a plurality of lenses, and the plurality of lenses may or may not be glued together.

Preferably, the projection module and the camera module are a module, and a filter unit is disposed in front of the exiting optical path of the lens, and the filter unit is configured to completely transmit visible light and infrared light and reflect 50 % of infrared light, the camera module is located in the light-emitting direction of the infrared light reflected by the filter unit.

Preferably, the filter unit is provided with a wave plate for improving the utilization of infrared light, and the wave plate is located in front of the exit light path of the filter unit and perpendicular to the central axis of the lens.

Preferably, the filter unit is configured as a filter assembly, and the filter assembly is located in front of the exit light path of the lens and is at 45 degrees to the light exit surface of the lens; the wave plate is configured as a first wave plate, the first A wave plate is located in front of the exiting light path of the filter assembly, perpendicular to the central axis of the lens.

Preferably, the filter unit is configured as a filter prism assembly, and the filter prism assembly comprises two right angle prisms, and the bonding surface of the filter prism assembly is located in front of the exit light path of the lens and Forming a 45 degree with the lens exit surface; wherein the wave plate is disposed as a second wave plate, the second wave plate is located in front of the exiting optical path of the filter prism assembly, and is glued to the filter prism assembly near the projection area One side, perpendicular to the center axis of the lens.

The invention has the beneficial effects that the interactive projection is realized by the projection module and the camera module, wherein the projection module and the camera module are integrated into one module through the filter element, thereby simplifying the system, and the LED is integrated by the optical path of the light combining system. The light source and the infrared light source are combined to realize the non-peripheral infrared device to realize the human-computer interaction operation, and the operation of repeatedly correcting the infrared light is eliminated.

DRAWINGS

1 is a schematic structural view of an infrared projection system according to an embodiment of the present invention;

2 is a schematic structural view of a first scheme of a light combining unit according to an embodiment of the present invention;

3 is a schematic structural view of a second scheme of a light combining unit according to an embodiment of the present invention;