Reflection spectrum imaging system for near-to-eye display

Abstract

The invention discloses a reflection spectrum imaging system for near-to-eye display in the technical field of optics, which is formed by combining an image projection unit (100) and an optical lens (200) with a reflection spectrum imaging function, and the image projection unit (100) is an image source projection optical system containing red (R) / green (G) / blue (G) and other monochromatic narrow-band spectrum characteristics, the optical lens (200) is provided with an optical reflection surface matched with the image projection unit (100) and is plated with an optical film (201) with a narrow-band spectrum reflection imaging function, and image light output by the image projection unit (100) can be directly projected to the inner surface of the optical lens (200), and reflected to the retina of the human eye by the optical thin film (201) to be imaged and form an amplified virtual image in front of the human eye, so that the aim of near-to-eye display is fulfilled. The LED display screen has the advantages of being good in human eye adaptability, high in imaging quality, high in display definition, excellent in perspective performance, capable of being designed to be light, thin and small, and easy to achieve industrial large-scale production.

Description

technical field [0001] The invention belongs to the field of optical technology, in particular to a reflection spectrum imaging system for near-eye display. Background technique [0002] Since Ivan Sutherland published the paper "Ultimate Display" (Ultimate Display) in 1965, virtual reality (VR) technology has been continuously improved from concept to theory and has promoted its application in military, aerospace, audio-visual entertainment, education, industrial design, medicine and other fields. The application of its existence, multi-perception, and interactivity has been loved and recognized by more and more people, and the demand from all walks of life is growing day by day. With the development and progress of science and technology such as computer technology, electronic information technology, and simulation technology, virtual reality (VR) technology, augmented reality (AR) technology, and mixed reality (MR) technology are competing to develop, and the application ...

AI Technical Summary

Problems solved by technology

In order to achieve the best effect of near-eye display devices, people have researched and developed many structural forms of near-eye display optical systems and optical lenses, which have been applied to related products, but so far the following common problems still exist in the existing technology: imaging The structure of the display system and lens is complicated, the adaptability to the human eye is not strong, and a vision correction device is required separately, the efficiency of light energy utilization is low, the quality of imaging display is difficult to meet the design requirements, the user experience is not good, and the processing technology is complex and large-scale manufacturing Difficulty, high manufacturing costs, etc., have hindered the large-scale manufacturing and market promotion of related technologies and products, making it difficult for them to be quickly popularized and applied

[0004] Early near-eye display imaging optical systems and lenses are mainly composed of multi-piece structures. Although this type of structure can achieve the effect of near-eye display, due to the relatively complex structure of the optical lens, thick optical thickness and heavy weight, it is not compatible with the human eye. The adaptability is poor, and the physiological reactions such as dizziness and nausea will appear when worn for a long time, and it will be gradually replaced by the new structure

In order to solve the above problems and realize the thinning of the near-eye display system, people have researched and developed a variety of structural forms of near-eye display optical systems and lenses. According to published related patents and information reports, the new near-eye display imaging system and optical lenses are mainly Design and develop around optical waveguide technology (including geometric optical waveguide, diffractive optical waveguide, holographic optical waveguide, etc.), free-form surface prism technology, free-form surface micro-nano optical superstructure surface technology, etc. Some of the patented technologies have been commercialized and sold. It has been pushed to the market and promoted the development and progress of near-eye display technology, but the above-mentioned existing technologies still have various deficiencies that make it difficult to meet the requirements of related technology development

Taking the representative optical waveguide imaging display technology as an example, the optical waveguide lens is considered to be the key development direction of the future AR near-eye display technology due to its light and thin shape structure and high light transmittance, such as the geometric optical waveguide of Israel Lumus Arrays, "Waveguide Components and Near-Eye Display Devices" (Application No. 201910212609.8) of China Huawei Technologies Co., Ltd., etc., diffractive optical waveguides such as the optical waveguide patent of Microsoft's HoloLens (US9372347), and the optical waveguide patent (US2018 / 0052277) published by Magic Leap ) and so on are surface relief grating waveguides based on lithography technology and holographic optical waveguides based on holographic technology. Their technical paths mainly revolve around planar optical waveguides to deal with the optical problems of near-eye display systems. Coupled in, and then allocated to the fan-shaped extended exit pupil area, and finally coupled out to the human eye by the square out-coupling area. Although the near-eye display optical system and optical lenses of the optical waveguide structure have a better thinning effect, there are still the following shortcomings: Due to the loss of light energy in the process of coupling in and out of the waveguide and transmission, the light energy utilization rate of the imaging display is low, and the diffraction dispersion effect that is difficult to eliminate in the diffractive optical waveguide causes the image to produce "rainbow" phenomenon and halo, and the optical waveguide lens is general It is difficult to manufacture curved lenses suitable for human eyes due to the parallel plate structure, and the complex processing technology of optical waveguide lenses leads to high yield and low cost. Obvious shortcomings such as thinning, prism dispersion effect, and poor adaptability to human eyes; the new technology of free-form surface micro-nano optical superstructure surface, such as the patent applied by the University of Rochester (ROCHESTER) "for virtual and augmented reality near-eye Free-form nanostructured surface of display" (patent application number 201680028406, authorized announcement number CN107771297B, authorized announcement date 2021.04.06) mainly uses combiners, secondary mirrors, and free-form nanostructured waveguides, as stated in the claims The 28 claims are all about the supergrating structure defined by the surface of the nanostructure, that is, cells with multiple superatoms and different aspect ratios. Its essence is to use the technical principle of reflective gratings. Lighter and thinner lenses, but the processing technology and process involved are more complicated, and the super grating on the surface of the nanostructure needs to be carefully protected, otherwise the fine nanostructure on the surface is not only easy to be scratched, but also slightly stained with dirt will affect the imaging display Effect, technology maturity still needs time

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