WO2016155622A1

WO2016155622A1 - Virtual image display system

Info

Publication number: WO2016155622A1
Application number: PCT/CN2016/077826
Authority: WO
Inventors: 郭滨刚; 赵九阳; 徐和平
Original assignee: 深圳市光科全息技术有限公司
Priority date: 2015-03-31
Filing date: 2016-03-30
Publication date: 2016-10-06
Also published as: CN104765155A; JP2018514000A; CN104765155B

Abstract

Disclosed is a virtual image display system comprising an apparatus, a light transmitting screen (2) and an image source (1) provided in the apparatus. The image source (1) is configured to generate a color light and transmit the color light to the light transmitting screen (2). The light transmitting screen (2) comprises a transparent substrate and an optical thin film (3) provided on a surface of the transparent substrate. The optical thin film (3) has a high reflectivity with respect to the color light generated by the image source (1) and first ambient light in ambient light having an identical wavelength as the color light, and has a high transmittance with respect to second ambient light. The second ambient light is the ambient light excluding the wavelength of the first ambient light. The virtual image display system addresses the technical problem in which a clear simulated hologram stereoscopic image is difficult to be provided for a viewer on a present projection reflection spectra vision system, wherein the clear simulated hologram stereoscopic image has a high contrast ratio, is realistic and integrated into an environment, and enables the viewer to see a vivid, clear and colorful virtual image in the air having a high contrast ratio and high image brightness.

Description

Virtual image display system

Technical field

The invention relates to a virtual image display system.

Background technique

Traditional projection is to directly image the image on an opaque or transparent screen plane, which is a 2D planar image without stereo or holographic viewing. Although some of the projection reflection type phantom imaging systems for large stage, such as the patents CN 1294517 C, CN1166210A, CN1035777A, the reflection screens of the image light used for the reflection projection system are not prepared to specifically correspond to the image. An optical film layer having wavelength-selective reflection characteristics that emits light at a specific wavelength of a source of three colors, so that an image imaged by a reflection image observed by an observer is poor (low brightness and contrast, low color saturation), and cannot be realistic, clear, and Colourful, high-contrast, high-intensity, high-fidelity color images make it difficult to see realistic stereo and holographic images.

The prior art generally uses a reflective film system having broad-spectrum reflection characteristics, and the light reflection is directed to a light wave having a wide range of continuous wavelengths including most of the visible light range (420 nm to 750 nm). This will cause the ambient light and the image light to be totally reflected without any difference, which will result in the deterioration of the final image display quality of the image light itself due to the incorporation of a large amount of ambient light, making it difficult for the viewer to see clear, high contrast, and true. Sense and immersive holographic stereo image incorporating the sense of environment.

Summary of the invention

In order to solve the technical problem that the existing projection reflection type phantom imaging system is difficult for the viewer to see clear high contrast, realistic and immersive holographic stereoscopic images, the present invention provides a virtual image display system. .

Technical solution of the invention:

A virtual image display system is characterized in that it comprises: a body, a light-transmissive screen, and an image source disposed in the body;

The image source is used to generate color image light and send it to a light-transmissive screen;

The transparent screen comprises a transparent substrate and an optical film disposed on a surface of the transparent substrate, wherein the optical film has high color image light generated by the image source and first ambient light having the same wavelength as the color image light in the ambient light. The reflectance has a high transmittance for the second ambient light, and the second ambient light is ambient light that does not conform to the wavelength condition of the first ambient light.

The color image light generated by the image source is a mixture of one or more of a first light having a wavelength of 605 to 680 nm, a second light having a wavelength of 500 to 565 nm, and a third light having a wavelength of 420 to 490 nm.

The optical film includes a reflective layer having a high reflectance for the first ambient light having the same wavelength as the color image light in the color image light and the ambient light, and a high transmittance for the second ambient light.

The optical film further includes a lens layer coated on the reflective layer, the lens layer being a thin film optical lens or a thin film optical lens array for modulating color image light or ambient light Change the characteristics of the divergence or convergence of light in its optical path.

The thin film optical lens is a Fresnel lens, and the thin film optical lens array is a Fresnel lens array.

The material of the transparent substrate is transparent glass, transparent ceramic or inorganic dielectric material or transparent organic compound; the transparent substrate has a thickness of 0.01 mm to 500 mm.

The above transparent ceramic or inorganic dielectric material comprises transparent alumina, sintered white corundum, magnesium oxide, cerium oxide, cerium oxide, cerium oxide-zirconia, gallium arsenide, zinc sulfide, zinc selenide, magnesium fluoride or calcium fluoride. .

The above transparent organic materials include PMMA, PC, PS, PET, PETG, transparent ABS, transparent PP, transparent PA, SAN, MS, MBS, PES, JD series optical resins, CR-39, TPX, HEMA, F4, F3, EFP , PVF, PVDF, EP, PF, UP, cellulose acetate, nitrocellulose or EVA;

The PES is polyethersulfone; the J.D series optical resin is a copolymerized derivative of PES; SAN is a styrene/acrylonitrile copolymer, TPX is polymethyl-1-pentene, and BS is 25% dibutyl Alkene/75% styrene copolymer, CR-39 is bisallyl diglycol carbonate polymer, and HEMA is hydroxyethyl methacrylate.

The reflective layer is a combination of a metal plating layer having a thickness of 5 nm to 1000 nm, a nano metal particle coating layer having a particle diameter of 5 nm to 500 nm, or a plating layer of a dielectric material having a thickness of 5 nm to 1000 nm.

The material of the metal plating layer is a mixture of one or more of aluminum, silver, gold, copper, chromium, platinum and rhodium; the material of the dielectric material plating layer is silicon monoxide, magnesium fluoride, silicon dioxide, A mixture of one or more of aluminum oxide, sintered white corundum, magnesium oxide, cerium oxide, cerium oxide, cerium oxide-zirconium dioxide, gallium arsenide, zinc sulfide, zinc selenide, and calcium fluoride.

The advantages of the invention:

The invention can make the observer see the virtual image which is vivid, clear, colorful, high contrast, high image brightness and imaged in the air, and the image can be effectively integrated with the environment, so that the viewer does not use any stereo glasses. Auxiliary, the naked eye can observe the image display with stereo and holographic feeling.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention;

2 is a schematic view showing the transmission of ambient light through a transparent screen;

3 is a schematic view showing the working principle of a reflective layer of an optical film;

4 is a schematic view showing the working principle of a lens layer of an optical film;

Figure 4a is a schematic diagram of convergence; Figure 4b is a schematic diagram of divergence;

The reference numerals are: 1-image source, 2-transparent screen, 3-optical film, 4-space virtual imaging.

detailed description

As shown in FIG. 1 , a schematic structural diagram of a virtual image display system includes a computer control system, a video signal interface, a body, a light-transmissive screen 2, and an image source 1 disposed in the body; and a computer control system through a video signal interface Connect to image source 1. The image source 1 is used to generate color image light and is sent to the light-transmissive screen; the surface of the light-transmitting screen 2 is provided with an optical film 3, and the optical film 3 is used for color image light generated by the image source. And the first ambient light having the same wavelength as the color image light in the ambient light has a high reflectance, and has a high transmittance for the second ambient light different from the wavelength of the color image light, and the second ambient light is not in conformity with the first environment Ambient light in the condition of light. As shown in Fig. 2, most of the natural ambient light of the continuous spectrum is transmitted.

The image source 1 includes a color image formed by three-color specific wavelengths: red (605-680 nm), green (500-565 nm), and blue (420-490 nm); one or more image sources have the above-mentioned specific wavelength characteristics. The color image is illuminated and outputted to the set optical path;

The optical film includes a reflective layer having a high reflectivity for the first ambient light having the same wavelength as the color image light in the color image light and the ambient light, and a high transmittance for the second ambient light.

In order to be able to adjust the distance of spatial virtual imaging, the optical film further comprises a lens layer coated on the reflective layer, the lens layer comprising a transparent substrate and a thin film optical lens or thin film optical lens array disposed on the transparent substrate, a thin film optical lens or Thin film optical lens arrays are used to modulate color image light or ambient light to alter the divergence or convergence of its optical path. For example, when the thin film optical lens is a Fresnel lens, the thin film optical lens array is a Fresnel lens array.

The material of the transparent screen is transparent glass, transparent ceramic, transparent organic compound or polymer or single crystal; the thickness of the transparent screen is 0.01 mm to 500 mm.

The color image light generated by the image source is a mixture of one or more of red light having a wavelength of 605 to 680 nm, green light having a wavelength of 500 to 565 nm, and blue light having a wavelength of 420 to 490 nm.

The film layer is used for reflecting color image light formed by mixing a specific wavelength, such as red (605-680 nm), green (500-565 nm), and blue (420-490 nm), from an image source; and the thin film optical lens or film An optical lens array, such as a Fresnel lens or a Fresnel lens array, which can modulate imaging or ambient light to alter the divergence or convergence characteristics of its optical path. The image light emitted by the image source is a color image light formed by a specific wavelength, such as red (605-680 nm), green (500-565 nm), blue (420-490 nm), single or mixed. The image light emitted by the image source is composed of specific wavelengths such as red (605-680 nm), green (500-565 nm), and blue (420-490 nm). Or mixing and emitting the formed color image light. The light-transmissive screen is a hard or flexible substrate made of a material transparent to visible light, and has a thickness of 0.01 mm to 500 mm. The material is transparent glass and transparent ceramics (such as transparent alumina, sintered white corundum, magnesium oxide, cerium oxide, and oxidation). Oxide transparent ceramics such as yttrium, yttria-zirconia, or non-oxide transparent ceramics such as gallium arsenide, zinc sulfide, zinc selenide, magnesium fluoride, calcium fluoride, etc., transparent organic compounds or polymers or Transparent materials such as crystal, among which transparent organic materials mainly include: PMMA, PC, PS, PET, PETG, transparent ABS, transparent PP, transparent PA, SAN (also known as AS), (also known as K resin), MS, MBS, PES, JD series, CR-39, TPX, HEMA, F4, F3, EFP, PVF, PVDF, EP, PF, UP, cellulose acetate, nitrocellulose and EVA. Among them, PES is polyethersulfone, JD series optical resin is a copolymerized derivative of PES, SAN is styrene/acrylonitrile copolymer, TPX is polymethyl-1-pentene, and BS is 25% butadiene/75% benzene. Ethylene copolymer, CR-39 is bisallyl diglycol carbonate polymer, and HEMA is hydroxyethyl methacrylate. Among these transparent organic substances, PC, PMMA, PS, PET, PETG, AS, BS, MS, MBS, transparent ABS, transparent PP, and transparent PA are most commonly used.

The reflective layer comprises: a metal plating layer having a thickness of 5 nm to 1000 nm of at least one layer, or a coating of a nano metal particle having a particle diameter of 5 nm to 500 nm (materials such as aluminum, silver, gold, copper, chromium, platinum, rhodium, etc.). Or a dielectric material plating layer (material such as silicon monoxide, magnesium fluoride, silicon dioxide, aluminum oxide, etc.) having a thickness of 5 nm to 1000 nm. The thickness of each layer of the dielectric material coating is proportional to the wavelength of the reflected light.

For example, a single metal coating can achieve high reflectivity of light over a wide spectral range; a composite of metal particle coating and dielectric material coating can achieve high reflectivity of light over a range of wavelengths; a single nano metal particle coating utilizes surface plasma light waves The resonance effect can achieve scattering and refraction of light for a specific wavelength; a multilayer composite dielectric film coating can achieve high reflectivity for light of a specific wavelength;

An example of a reflective film structure of a specific wavelength: a multilayer reflective film structure consists of at least three films, each of which is formed by coating of nano metal ions of different size forms, and can generate a strong scattering effect on light waves in a specific wavelength range > A high reflectivity film characteristic with a specific wavelength selectivity of more than 45% reflectivity.

An example of a reflective film structure of a specific wavelength: a multilayer reflective film structure is formed by alternately vapor-depositing two materials of high and low refractive index, and the thickness of each film is one quarter of a certain wavelength. Under this condition, the reflected light vectors on the faces of the superimposed layers are in the same direction of vibration. The combined amplitude of the emitted light at that particular wavelength will increase as the number of layers of the film increases, eventually resulting in a high reflectivity effect for that particular wavelength of light, and the theoretical reflectance can approach 100%. As shown in Figure 3.

Thin Film Lens: The thin film lens may be an array structure formed by a single Fresnel lens or a plurality of Fresnel lenses, or an array structure formed by a plurality of liquid crystal lenses. The thin film optical lens system can modulate imaging or ambient light to alter the diverging or converging characteristics of its optical path. Thereby, the virtual image imaging size and the modulation of the imaging depth of field can be realized, as shown in FIG. 4, wherein FIG. 4a is a convergence diagram; FIG. 4b is a divergence diagram.

The working principle of the invention:

The light-transmissive screen is disposed in the transmission light path of the image-emitting light, and the surface of the light-transmissive screen is prepared with a film having various optical functions, and the optical film 3 is composed of a plurality of films with different functions for respectively modulating and transmitting in the optical path. The transmission characteristics of the color image light and the ambient light, after the optical film 3 modulates the transmitted light in the optical path, the three-color image light of the specific wavelength emitted by the image source 1 is reflected or reflected by the optical film according to the set optical path. Partially to the viewer's eye, the ambient light with continuous spectral characteristics is transmitted in the optical path, and the ambient light of the remaining wavelengths can be smoothly transmitted through the preparation of the optical film having the selected wavelength reflection characteristic except for the specific wavelength range. The light-transmissive screen enables an observer located in front of the light-transmissive screen to observe a virtual image of a clear color in the air at a certain distance behind the light-transmitting screen. The virtual image of the space is not displayed on the light-transmissive screen or Other physical carriers are displayed on the surface, but are displayed in the air and integrated with the background environment, so The eyes of the image having a stereoscopic video display certain features or holographic image; light transmissive screen may be flexibly bendable plastic screen or a rigid glass screen.

Claims

A virtual image display system, comprising: a body, a light-transmissive screen, and an image source disposed in the body;

The image source is used to generate color image light and send it to a light-transmissive screen;

The transparent screen comprises a transparent substrate and an optical film disposed on a surface of the transparent substrate, wherein the optical film has high color image light generated by the image source and first ambient light having the same wavelength as the color image light in the ambient light. The reflectance has a high transmittance for the second ambient light, and the second ambient light is ambient light that does not conform to the wavelength condition of the first ambient light.
The virtual image display system according to claim 1, wherein the color image light generated by the image source is a first light having a wavelength of 605 to 680 nm, a second light having a wavelength of 500 to 565 nm, and a wavelength of 420 to 420. A mixture of one or more of the third light at 490 nm.
The virtual image display system according to claim 1 or 2, wherein the optical film comprises a reflective layer, and the reflective layer is a first environment having the same wavelength as the color image light and the ambient light and the color image light. Light has a high reflectivity and a high transmittance for the second ambient light.
The virtual image display system according to claim 3, wherein the optical film further comprises a lens layer coated on the reflective layer, the lens layer being a thin film optical lens or a thin film optical lens array, the thin film optical Lens or thin film optical lens arrays are used to modulate color image or ambient light to alter the divergence or convergence of light in its optical path.
The virtual image display system according to claim 4, wherein the thin film optical lens is a Fresnel lens, and the thin film optical lens array is a Fresnel lens array.
The virtual image display system according to claim 5, wherein the transparent substrate is made of transparent glass, transparent ceramic or inorganic dielectric material or transparent organic compound; and the transparent substrate has a thickness of 0.01 mm to 500 mm.
The virtual image display system according to claim 6, wherein the transparent ceramic or inorganic dielectric material comprises transparent alumina, sintered white corundum, magnesium oxide, cerium oxide, cerium oxide, cerium oxide-zirconium dioxide, arsenic. Gallium, zinc sulfide, zinc selenide, magnesium fluoride or calcium fluoride.
The virtual image display system according to claim 7, wherein the transparent organic compound comprises PMMA, PC, PS, PET, PETG, transparent ABS, transparent PP, transparent PA, SAN, MS, MBS, PES, JD. a combination of one or more of a series of optical resins, CR-39, TPX, HEMA, F4, F3, EFP, PVF, PVDF, EP, PF, UP, cellulose acetate, and nitrocellulose or EVA;

The PES is polyethersulfone; the JD series optical resin is a copolymerized derivative of PES; SAN is a styrene/acrylonitrile copolymer, TPX is polymethyl-1-pentene, and BS is 25% butadiene/ 75% styrene copolymer, CR-39 is bisallyl diglycol carbonate polymer, and HEMA is hydroxyethyl methacrylate.
The virtual image display system according to claim 8, wherein the reflective layer is a metal plating layer having a thickness of 5 nm to 1000 nm, or a nano metal particle coating layer having a particle diameter of 5 nm to 500 nm, or a thickness of 5 nm to 1000 nm. A combination of one or more layers of a dielectric material coating.
The virtual image display system according to claim 9, wherein the material of the metal plating layer is a mixture of one or more of aluminum, silver, gold, copper, chromium, platinum and rhodium; and the dielectric The material of the material coating is silicon monoxide, magnesium fluoride, silicon dioxide, aluminum oxide, sintered white corundum, magnesium oxide, cerium oxide, cerium oxide, cerium oxide-zirconia, gallium arsenide, zinc sulfide, selenium. A mixture of one or more of zinc and calcium fluoride.