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A virtual retinal display (VRD), also known as a retinal scan display (RSD) or retinal projector (RP), is a display technology that draws a raster display (like a television) directly onto the retina of the eye.
In the past similar systems have been made by projecting a defocused image directly in front of the user's eye on a small "screen", normally in the form of large glasses. The user focused their eyes on the background, where the screen appeared to be floating. The disadvantage of these systems was the limited area covered by the "screen", the high weight of the small televisions used to project the display, and the fact that the image would appear focused only if the user was focusing at a particular "depth". Limited brightness made them useful only in indoor settings as well.[ citation needed ]
Only recently a number of developments have made a true VRD system practical. In particular the development of high-brightness LEDs have made the displays bright enough to be used during the day, and adaptive optics have allowed systems to dynamically correct for irregularities in the eye (although this is not always needed). The result is a high-resolution screenless display with excellent color gamut and brightness, far better than the best television technologies.
The VRD was invented by Kazuo Yoshinaka of Nippon Electric Co. in 1986. [1] Later work at the University of Washington in the Human Interface Technology Lab resulted in a similar system in 1991. [2] Most of the research into VRDs to date has been in combination with various virtual reality systems. In this role VRDs have the potential advantage of being much smaller than existing television-based systems. They share some of the same disadvantages however, requiring some sort of optics to send the image into the eye, typically similar to the sunglasses system used with previous technologies. It also can be used as part of a wearable computer system. [3]
A Washington-based startup, MicroVision, Inc., has sought to commercialize VRD. Founded in 1993, MicroVision's early development work was financed by US government defense contracts and resulted in the prototype head-mounted display called Nomad. [4] [5]
In 2018, Intel announced Vaunt, a set of smart glasses that are designed to appear like conventional glasses, which use retinal projection via a vertical-cavity surface-emitting laser and holographic grating. [6] Intel gave up on this project, [7] and sold the technology to North. [8]
In the same year, QD Laser, a Japanese laser maker spun off from Fujitsu, developed the first commercialized true VRD RETISSA Display. In the following year, the firm started to sell the successor VRD RETISSA Display II, which featured a higher resolution equivalent to 720p. [9]
In 2023 Sony produced a compact camera with an integrated Retissa Neoviewer retinal projection device, for release in the US. The resolution of the retinal display only (not the camera) is claimed by the manufacturers to be nominally equivalent to 720P. [10]
Although "not a medical device" it is hoped that the retinal projection viewer may be of particular value to some visually impaired users, and the adaptation was heavily subsidised by Sony. Because of the novel user experience, and limited availability, potential buyers were strongly encouraged to participate in "touch-and-try" events to see if the technology is useful to their particular circumstances before committing to a purchase. [11]
A wearable computer, also known as a body-borne computer, is a computing device worn on the body. The definition of 'wearable computer' may be narrow or broad, extending to smartphones or even ordinary wristwatches.
Augmented reality (AR) is an interactive experience that combines the real world and computer-generated content. The content can span multiple sensory modalities, including visual, auditory, haptic, somatosensory and olfactory. AR can be defined as a system that incorporates three basic features: a combination of real and virtual worlds, real-time interaction, and accurate 3D registration of virtual and real objects. The overlaid sensory information can be constructive, or destructive. This experience is seamlessly interwoven with the physical world such that it is perceived as an immersive aspect of the real environment. In this way, augmented reality alters one's ongoing perception of a real-world environment, whereas virtual reality completely replaces the user's real-world environment with a simulated one.
Night vision is the ability to see in low-light conditions, either naturally with scotopic vision or through a night-vision device. Night vision requires both sufficient spectral range and sufficient intensity range. Humans have poor night vision compared to many animals such as cats, dogs, foxes and rabbits, in part because the human eye lacks a tapetum lucidum, tissue behind the retina that reflects light back through the retina thus increasing the light available to the photoreceptors.
Stereoscopy is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision. The word stereoscopy derives from Greek στερεός (stereos) 'firm, solid', and σκοπέω (skopeō) 'to look, to see'. Any stereoscopic image is called a stereogram. Originally, stereogram referred to a pair of stereo images which could be viewed using a stereoscope.
A head-up display, or heads-up display, also known as a HUD or head-up guidance system (HGS), is any transparent display that presents data without requiring users to look away from their usual viewpoints. The origin of the name stems from a pilot being able to view information with the head positioned "up" and looking forward, instead of angled down looking at lower instruments. A HUD also has the advantage that the pilot's eyes do not need to refocus to view the outside after looking at the optically nearer instruments.
Liquid crystal on silicon is a miniaturized reflective active-matrix liquid-crystal display or "microdisplay" using a liquid crystal layer on top of a silicon backplane. It is also referred to as a spatial light modulator. LCoS was initially developed for projection televisions but is now used for wavelength selective switching, structured illumination, near-eye displays and optical pulse shaping. By way of comparison, some LCD projectors use transmissive LCD, allowing light to pass through the liquid crystal.
A cave automatic virtual environment is an immersive virtual reality environment where projectors are directed to between three and six of the walls of a room-sized cube. The name is also a reference to the allegory of the Cave in Plato's Republic in which a philosopher contemplates perception, reality, and illusion.
A head-mounted display (HMD) is a display device, worn on the head or as part of a helmet, that has a small display optic in front of one or each eye. An HMD has many uses including gaming, aviation, engineering, and medicine. Virtual reality headsets are HMDs combined with IMUs. There is also an optical head-mounted display (OHMD), which is a wearable display that can reflect projected images and allows a user to see through it.
Anaglyph 3D is the stereoscopic 3D effect achieved by means of encoding each eye's image using filters of different colors, typically red and cyan. Anaglyph 3D images contain two differently filtered colored images, one for each eye. When viewed through the "color-coded" "anaglyph glasses", each of the two images reaches the eye it's intended for, revealing an integrated stereoscopic image. The visual cortex of the brain fuses this into the perception of a three-dimensional scene or composition.
Fulldome refers to immersive dome-based video display environments. The dome, horizontal or tilted, is filled with real-time (interactive) or pre-rendered (linear) computer animations, live capture images, or composited environments.
Screenless video is any system for transmitting visual information from a video source without the use of a screen. Screenless computing systems can be divided into three groups: Visual Image, Retinal Direct, and Synaptic Interface.
Display motion blur, also called HDTV blur and LCD motion blur, refers to several visual artifacts that are frequently found on modern consumer high-definition television sets and flat panel displays for computers.
Vuzix is an American multinational technology company headquartered in Rochester, New York and founded by Paul Travers in 1997. Vuzix is a supplier of wearable virtual reality and augmented reality display technology. Vuzix manufactures and sells computer display devices and software. Vuzix head-mounted displays are marketed towards mobile and immersive augmented reality applications, such as 3D gaming, manufacturing training, and military tactical equipment. On January 5, 2015, Intel acquired 30% of Vuzix's stock for $24.8 million.
Recon Instruments was a Canadian technology company that produced smartglasses and wearable displays marketed by the company as "heads-up displays" for sports. Recon's products delivered live activity metrics, GPS maps, and notifications directly to the user's eye. Recon's first heads-up display offering was released commercially in October 2010, roughly a year and a half before Google introduced Google Glass.
An optical head-mounted display (OHMD) is a wearable device that has the capability of reflecting projected images as well as allowing the user to see through it. In some cases, this may qualify as augmented reality (AR) technology. OHMD technology has existed since 1997 in various forms, but despite a number of attempts from industry, has yet to have had major commercial success.
Smartglasses or smart glasses are eye or head-worn wearable computers that offer useful capabilities to the user. Many smartglasses include displays that add information alongside or to what the wearer sees. Alternatively, smartglasses are sometimes defined as glasses that are able to change their optical properties, such as smart sunglasses that are programmed to change tint by electronic means. Alternatively, smartglasses are sometimes defined as glasses that include headphone functionality.
A virtual reality headset is a head-mounted device that provides virtual reality for the wearer. VR headsets are widely used with VR video games but they are also used in other applications, including simulators and trainers. VR headsets typically include a stereoscopic display, stereo sound, and sensors like accelerometers and gyroscopes for tracking the pose of the user's head to match the orientation of the virtual camera with the user's eye positions in the real world.
The Sony Xperia XZs is an Android smartphone manufactured and marketed by Sony. Part of the Xperia X series, the device was announced to the public along with the Xperia XZ Premium at the annual Mobile World Congress last February 2017.
The Sony Xperia XZ1 is an Android smartphone manufactured and marketed by Sony. Part of the Xperia X series, the device was announced to the public along with the Xperia XZ1 Compact at the annual IFA 2017 on August 31, 2017. It is the direct successor to the Sony Xperia XZ according to Sony, and is the latest flagship after the Xperia XZ Premium.
Ray-Ban Stories are smartglasses created as a collaboration between Meta Platforms and EssilorLuxottica. The product includes two cameras, open-ear speakers, a microphone, and touchpad, all built into the frame. The glasses, announced in August 2020 and released on September 9, 2021, had a controversial reception stemming from mistrust over Facebook’s privacy controls. The small size of the recording indicator light has also led to controversy post-release. Ray-Ban Stories are the latest in a line of smartglasses released by major companies including Snap Inc and Google and are designed as one component of Facebook’s plans for a metaverse. Unlike smart glasses previously created by other companies, the Ray-Ban Stories do not include any HUD or AR head-mounted display.
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