Image projection device and AR display equipment

Abstract

The invention provides an image projection device and AR display equipment, and belongs to the technical field of augmented reality imaging. The image projection device includes an image source and alens assembly. The lens assembly tightly fits with the image source, refractive index difference of an interface when light enters a lens can be reduced, the transmittance of the upper surface of thelens can be enhanced, light efficiency can be increased, and the generation of stray light and ghost images can be inhibited. The advantages of the image projection device and AR display equipment areas follows: first, as the image source and the lens fit with each other or have no gaps, an optical system can be more compact in structure, smaller in volume, lighter in weight and comfortable in wearing; second, large numerical apertures can be realized by increasing image refractive indexes and using relatively small aperture angles, the deflection angles of marginal rays can be decreased, anddesign difficulties can be reduced; third, the refractive index difference at the interface of the lens can be decreased, the transmittance of the marginal rays can be enhanced, the ghost images canbe reduced, and brightness can be increased; and fourth, compact element arrangement, convenient installation and adjusting and high system intensity can be realized.

Description

technical field [0001] The present invention relates to the technical field of augmented reality imaging, and in particular, relates to an image projection device and an AR display device. Background technique [0002] AR (Augmented Reality, Augmented Reality) is also known as mixed reality. Its principle is to apply virtual information to the real world through computer technology. The real environment and virtual objects are superimposed on the same picture or space in real time. [0003] Currently, people can interact with the real world through wearable devices, such as AR glasses or AR helmets. Such as figure 1 A schematic structural diagram of an AR display device in an existing AR glasses or an AR helmet is shown, as shown in figure 1 As shown, the existing AR display device optical system includes an image source 11, a beam splitter 3, a curved half mirror 4 and a lens 12 located above the beam splitter 3, the image source 11 is arranged on the upper part of the op...

AI Technical Summary

Problems solved by technology

[0005] 1. There is a gap between the image source and the lens and the gap is too large, resulting in a large optical system structure size;

[0006] 2. There is air between the image source and the lens, the refractive index is low, the numerical aperture is difficult to increase, the limit resolution of the system is limited, and the design is difficult;

[0007] 3. Due to the large difference in refractive index between the air and the lens interface, the reflectivity of this surface is high, which is easy to cause ghost images and other stray light to the subsequent system;

[0008] 4. The distribution of components is scattered, which makes assembly and adjustment difficult and easy to damage

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