Recently, the U.S. patent and Trademark Office issued a patent application from apple, which relates to future HMD equipment, including dispersion compensation structure and methods for optical reflection equipment with holographic optical elements, which have the ability to reflect projection images and allow users to experience high-quality AR images.
The hologram can be realized in the optical medium of the holographic optical element. Wave separation may occur at different frequencies for light passing through some dispersion boundaries. For different frequencies, the dispersion relation between the refractive index of one medium and that of another can be used to compensate the dispersion of light in optical devices.
The dispersion compensation technique based on dispersion relation can be used to determine the hologram which can compensate the dispersion effect of some dispersion boundary. The resulting holographic optical element (HOE) may be substantially similar to that in an optical device or a specific operating environment (E.G., in the case of a projection optical device, in the case of an edge coupling, or in a fluid medium such as air or water).
Apple further pointed out that HMD usually uses near eye optics to create “virtual” images. In the past, HMD faced various technical limitations, which reduced image quality and increased weight and size.
In the past, equipment usually included conventional optics to reflect, refract or diffract light, but the design tended to be cumbersome. In addition, the conventional mirror and grating structure is also very limited.
For example, a regular mirror has a reflection axis that must coincide with the surface normal. The reflection axis of the traditional mirror may lead to the poor orientation or performance of the mirror. Moreover, the conventional grating structure usually includes a plurality of reflection axes which are concave with the incident angle or wavelength.
Therefore, the device for reflecting light in Apple’s patent may include the following features: it reflects light around a reflecting axis not limited to the surface normal, and for a given incident angle, its reflecting angle is constant at multiple wavelengths. The embodiment of the device may have a substantially constant reflection axis (for example, the change of the reflection axis angle of the reflection axis is less than 1.0 degrees) over the entire range of the incidence angle of the incident light of a given wavelength.
In Apple’s patent Figure 1, we can see the illustration of HMD 100, which can realize the principle contained here. The HMD may include glasses or headwear, wherein the near eye display (NED) 105 may be pasted in front of the user’s eyes.
The ned may include a diffractive element portion disposed within a lens assembly of the HMD or combined with a lens assembly of the HMD. In some examples, the diffractive element part is a holographic optical element (HOE), which may include a deflector 110.
Apple further pointed out that the deflector is a reflection device, which can include grating medium, volume hologram or other grating structures.
The deflector may include an additional layer, such as a glass cover or a glass substrate. The additional layer can be used to protect the grating medium from the pollution and damage of moisture, oxygen and reactive chemicals. The additional layer can also have a refractive index that matches the grating medium.
Apple patent Figure 7 is a side view of an illustrative input prism and an illustrative polarizer with a grating whose deflection axis changes with the size of the grating. Fig. 12 is a side view of an illustrative input prism of different regions with different dispersion characteristics.
The Apple patent application 20200117003, issued by the U.S. Patent Office, was filed in the fourth quarter of 2019. Given that this is a patent application, it is not known when this product will be launched.
One of the key engineers behind the patent is Dr. vikrant bhakta, who is engaged in some projects at Apple, including optical imaging, projection display, lighting engineering, structured light lighting for 3D sensing and super-resolution, AR and VR head mounted displays, computational imaging, radiance and photometric modeling and analysis, Fourier optics, imaging and non imaging optical system design, etc.
As an emerging industry, the global holographic AR market has great growth potential, attracting a lot of investment and making a great contribution to the industry growth. Technology giants including apple, Google and Facebook are investing heavily in the technology to develop solutions for businesses and consumer groups. Over the years, the holographic augmented reality market has been widely used in game, media and marketing applications. Its application in different industries such as advertising, entertainment, education and retail is expanding, and it is expected to promote demand in the forecast period.
At present, the AR industry is in the starting stage of the market. At this stage, the consumer market of augmented reality technology is opened, and it is gradually implemented in the form of advertising service products and hardware products. There are more and more participants. The industry is characterized by exploring application fields and mining profit models. The market has been gradually integrated, some manufacturers insist on exploring business models, AR hardware products and AR derivatives are constantly enriched, and the industry has been paid more and more attention by the capital market.
At present, AR application is mainly used in entertainment, advertising, education and other industries. Its hardware environment is relatively mature, which is very beneficial to the development of software and content in these fields. In the long run, this application will also appear in the field of social network and communication, although these applications are still limited by hardware technology.
In the past few centuries, the mainstream visual display media has experienced an extraordinary transformation from paper (Book) to large screen (TV / computer) and small screen (Smartphone). Although the quality of visual display media is constantly improving, it is still far from the ultimate goal – the perfect combination of virtual and reality, which has never been approached by human beings in holographic AR technology. Therefore, the motivation to achieve the ultimate goal of visual display media will promote the continuous efforts in this field, and will ensure that once the market conditions are mature, it will be widely accepted and adopted.
WIMI Hologram Cloud (NASDAQ:WIMI) builds a real-time modeling system of multi angle photographing, which can scan all-dimensional images of the collected objects and synthesize them into three-dimensional models in real time. Six degree matrix optical field system: multi light sources are used synthetically to construct the imaging field of holographic virtual image. Binocular parallax intelligent enhancement system: in the acquisition process, the object track is dynamically tracked and the light is adjusted to maintain the balance value of binocular disparity. Multi image dynamic fusion system: a multi-dimensional image wide-angle acquisition technology in narrow space is applied to the cloud vision miniaturized holographic stack. High speed holographic image processing algorithm: the image information is processed at a high speed, and the rendering effect is guaranteed. The processing speed is up to 10Gb / s. Stealth polyester optical imaging film: the key component of holographic imaging, making the holographic image perfect imaging display. Holographic virtual character voice reconstruction technology: using human skeleton dynamic capture, image real-time rendering, speech recognition technology, voice simulation technology to present virtual human. Holographic cloud platform: an interactive platform covering the whole country for image acquisition and restoration, with data storage, image restoration and holographic social attributes.
Through the combination of the above systems, WIMI Hologram Cloud (NASDAQ:WIMI) has built a complete 5g holographic communication application platform to support various online terminals and personal equipment applications, while expanding various mainstream 5g holographic applications such as holographic social communication, holographic family interaction, holographic star interaction, holographic online education, holographic online conference, etc. Due to the change of 5g communication network bandwidth, high-end holographic applications are gradually applied to social media, communication, navigation, home applications and other application scenarios. The plan of WIMI Hologram Cloud (NASDAQ:WIMI) is to provide holographic cloud platform services through 5g communication network.
At present, AR + is mainly used in industrial manufacturing and maintenance, medical treatment, military affairs, television broadcasting, entertainment and games, education, digital cultural heritage and historic site restoration, tourism exhibition, municipal construction and other fields. AR + will be an important model for future industrial development.
WIMI Hologram Cloud (NASDAQ:WIMI)’s business application scenarios are mainly concentrated in five professional fields, such as home entertainment, optical theater, performance system, commercial publishing system and advertising display system. In terms of technology development, product maturity and application scenario richness, the future market space of AR holography industry has greater potential and more explosive power.
According to the report released by digi capital, the revenue scale of AR holographic market is expected to reach 120 billion US dollars in 2020, about four times of that of virtual reality market (the revenue scale of virtual reality market in 2020 is about 30 billion US dollars). AR holographic technology is the common goal of human science and technology development, and holographic technology is the development vision of IT industry. AR holography is the technological development goal of social, communication, entertainment, education and other industries.
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