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Created page with "{{Company Infobox |image= |Type=Private |Industry=Virtual Reality, Head-mounted Displays |Founded=1997, United States |Founder=Joint venture between Ilixco, Inc. and Liberty Media Group |Headquarters=United States |Notable Personnel= |Products=i-glasses series (i-glasses PC, i-glasses SVGA, i-glasses HRV) |Parent= |Website= }} '''I-O Display Systems''' (also known as IOD) was an American technology company that specialized in the development and manufacture of head-mo..."
 
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{{Company Infobox
{{Company Infobox
|image=
|image=
|Type=Private
|Type= Private
|Industry=Virtual Reality, Head-mounted Displays
|Industry= [[Virtual Reality]], [[Personal Display Systems]], [[Stereoscopic 3D]] products
|Founded=1997, United States
|Founded= 1993 in Seattle, Washington, United States
|Founder=Joint venture between Ilixco, Inc. and Liberty Media Group
|Founder= [[Greg Amadon]], [[Linden Rhoads]]
|Headquarters=United States
|Headquarters= Seattle, Washington, United States (originally); later Menlo Park, California (as division of Ilixco, Inc.)
|Notable Personnel=
|Notable Personnel= Greg Amadon (CEO, 1993–1997); Linden Rhoads (President, 1993–1996)
|Products=i-glasses series (i-glasses PC, i-glasses SVGA, i-glasses HRV)
|Products= i-glasses series (i-glasses PC, i-glasses SVGA, i-glasses HRV), i-Theater
|Parent=
|Parent= Initially independent; later Ilixco (controlling interest); previously a venture with Liberty Media Group
|Website=
|Website= (Defunct)
}}
}}


'''I-O Display Systems''' (also known as IOD) was an American technology company that specialized in the development and manufacture of [[head-mounted display|head-mounted displays]] (HMDs) for [[virtual reality]] and personal viewing applications. The company was known for its flagship product line, the i-glasses brand, which became one of the pioneering consumer-level HMDs during the early development of the [[virtual reality]] industry in the 1990s and early 2000s.
'''I-O Display Systems, LLC''' (originally styled '''Virtual i·O''') was an American technology company that specialized in the development and manufacturing of [[head-mounted display]]s (HMDs). Founded in 1993 in Seattle, Washington by entrepreneurs [[Greg Amadon]] and [[Linden Rhoads]], the company is best known for its ''i-glasses'' product line, which provided personal display systems for [[virtual reality]] (VR) and video applications.<ref name="PSBJMar97">{{cite news|title=Financial reality pressures Virtual i‑O into Chapter 11|work=Puget Sound Business Journal|date=March 16, 1997|url=https://www.bizjournals.com/seattle/stories/1997/03/17/story6.html}}</ref> The company was a significant pioneer in the early consumer VR market of the 1990s, attracting almost US$20 million in venture funding before filing for bankruptcy in 1997.<ref name="PSBJMay97">{{cite news|title=Effort to salvage Virtual i‑O fails|work=Puget Sound Business Journal|date=May 25, 1997|url=https://www.bizjournals.com/seattle/stories/1997/05/26/story4.html}}</ref>


== History ==
==History==


I-O Display Systems was formed in 1997 as a joint venture between Ilixco, Inc. and Liberty Media Group.<ref name="jpdformation">Jon Peddie Research. "i-O Display shows off PRO SVGA compatible headset at SID 2003." https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/</ref> The company positioned itself as a manufacturer of personal display devices, focusing on head-mounted displays for both video and computer applications.
===Origins and Formation (1993-1997)===
I-O Display Systems began as Virtual i·O, founded in 1993 by Greg Amadon, a former Microsoft engineer, and attorney Linden Rhoads. The company attracted early investment after demonstrating a stereoscopic viewer prototype to cable-TV magnate John Malone, whose Tele-Communications Inc. (TCI) became the company's lead investor.<ref name="3DOWorld">{{cite web|title=IGlasses|website=3DO World|url=https://3do.world/index.php?title=IGlasses|access-date=7 May 2025}}</ref>


I-O Display Systems emerged during an important transitional period in the history of virtual reality technology. The 1990s saw the first commercial attempts to bring VR technology to consumers, and I-O Display Systems was among the pioneering companies to enter this market with relatively affordable HMD products.
By late 1994, the firm had developed prototypes using dual 0.7-inch LCDs and an in-house "sourceless orientation sensor," which was later patented in the United States.<ref name="JustiaSensor">{{cite patent|number=US5526022|title=Sourceless orientation sensor|assignee=Virtual I/O, Inc.|date=June 11, 1996}}</ref> The first retail models reached North American shelves in May 1995.


The company became known for its i-glasses brand, which offered consumers an accessible entry point into virtual display technology compared to more expensive professional VR systems of the era. Throughout its existence, I-O Display Systems continued to develop and refine its product line to keep pace with advancements in display technology and changing consumer demands.
In 1997, the original Virtual i·O was restructured as I-O Display Systems, LLC ("IOD"), formed as a new venture between Ilixco, a privately held display technology company, and Liberty Media Group, an AT&T company with interests in video programming, communications technology, and Internet businesses.<ref name="SistematicsFormed">{{cite web |url=https://www.sistematics.com/en/i-o-display-systems-m-353.html |title=Listado de productos por marca I-O Display Systems |publisher=Sistematics.com |accessdate=May 7, 2025}}</ref> Ilixco itself was a holding company formed in 1996 by Jeffrey Fergason, son of James Fergason (founder of the first [[Liquid Crystal Display|LCD]] manufacturer, ILIXCO, in 1968). The new Ilixco held controlling interests in I-O Display Systems and Razor Digital Entertainment.<ref name="LXDCorp">{{cite web |url=https://en.wikipedia.org/wiki/LXD_Incorporated |title=LXD Incorporated - Wikipedia |publisher=Wikipedia |accessdate=May 7, 2025}}</ref>


== Products ==
===Bankruptcy and Closure (1997)===
Despite gaining market share in the emerging VR headset market, the company faced financial difficulties as consumer VR adoption grew slower than anticipated. Co-founders Amadon and Rhoads resigned in January 1997, and Virtual i·O filed for Chapter 11 protection on March 14, reporting US$9.7 million in assets against US$21.6 million in liabilities—most owed to TCI and Thomson SA.<ref name="PSBJMar97"/>


=== i-glasses PC ===
Annual headset returns peaked at 30 percent owing to fragile cables and dust ingress,<ref name="Tampa97">{{cite news|title=Reality has not lived up to the promise for virtual‑reality games|work=Tampa Bay Times|date=28 Sep 1997|url=https://www.tampabay.com/archive/1997/09/28/reality-has-not-lived-up-to-the-promise-for-virtual-reality-games/}}</ref> further complicating the company's financial position. A court-appointed turnaround team failed to secure a buyer, and operations ceased on April 30, 1997; the remaining assets reverted to TCI the following month.<ref name="PSBJMay97"/>


The original i-glasses personal display system was designed to be compatible with PCs and video devices. These early models featured dual displays that presented color video images with a resolution of 640×480 pixels.<ref name="xvrwiki">XVRWiki. "I-O Display Systems." http://www.xvrwiki.org/wiki/I-O_Display_Systems</ref>
The company's intellectual property and brand would later be utilized in continued development of i-glasses products into the early 2000s.


Key features of the i-glasses PC included:
==Products==
I-O Display Systems was best known for its "i-glasses" series of [[HMD]]s and the "i-Theater" personal display. These devices aimed to provide a large-screen viewing experience in a portable, head-worn form factor.


{| class="wikitable"
===i-glasses Series===
! Feature !! Specification
The i-glasses line included several models with varying specifications and target markets:
|-
| Display Type || Color LCD
|-
| Resolution || 640×480 pixels
|-
| Field of View || Approximately equivalent to viewing an 80-inch screen from 13 feet
|-
| Audio || Built-in stereo sound
|-
| Special Features || VideoMute feature (see-through capability)
|}
 
The i-glasses PC models were promoted as providing a large-screen viewing experience in a portable format. Marketing materials often compared the experience to viewing an 80-inch screen. A distinctive feature was the "VideoMute" capability, which allowed users to see through the display when desired, making it an early implementation of what would later evolve into [[augmented reality]].<ref name="mindflux">MINDFLUX. "i-O Display Systems i-glasses! PC." http://www.mindflux.com.au/products/io-display/iglass_pc.html</ref>
 
=== i-glasses SVGA ===
 
The i-glasses SVGA represented an advancement in the company's product line, offering higher resolution displays to meet increasing demands for better visual quality. These models were designed to accept [[Super VGA|SVGA]] (800×600) input from computer sources.


{| class="wikitable"
{| class="wikitable"
! Feature !! Specification
|+ Selected i-glasses Models and Features
! Model Name !! Key Features !! Resolution (per eye where applicable) !! Virtual Screen Size !! Weight !! Connectivity !! Notes
|-
|-
| Display Type || High-resolution color LCD
| '''i-glasses (Original/PC Version)''' || Full color video, [[stereoscopic 3D]] capable, optional head tracking, see-through capability ("VideoMute"), could be worn with eyeglasses.<ref name="MindfluxPC">{{cite web |url=https://www.mindflux.com.au/products/hardware/iglassespcd.html |title=i-O Display Systems i-glasses! PC - Mindflux |publisher=Mindflux |accessdate=May 7, 2025}}</ref> || 640x480 || Claimed equivalent to an 80-inch screen from 13 feet.<ref name="MindfluxPC"/> || Approximately 8 ounces (227g) || PC (VGA), Video (Sega, Nintendo, Atari, 3DO) || Released May 1995 at US$549.<ref name="VRShop">{{cite web|title=Virtual IO I‑Glasses – Specs and Info|website=The VR Shop|date=14 Feb 2022|url=https://www.virtual-reality-shop.co.uk/virtual-io-i-glasses/}}</ref>
|-
|-
| Resolution || Support for up to 800×600 pixels
| '''i-glasses SVGA''' || Portable monitor, flicker-free (120Hz refresh), built-in stereo headphones, adjustable color/brightness/contrast.<ref name="MindfluxSVGA">{{cite web |url=https://www.mindflux.com.au/products/hardware/iglassessvga.html |title=i-O Display Systems i-glasses SVGA - Mindflux |publisher=Mindflux |accessdate=May 7, 2025}}</ref> Supported frame sequential stereo with nVidia game drivers or other applications (optional stereo version).<ref name="ManualsLibSVGA">{{cite web |url=https://www.manualslib.com/manual/110089/Io-Display-Systems-I-Glasses.html?page=1#manual |title=IO Display Systems i-glasses User Manual - ManualsLib |publisher=ManualsLib |accessdate=May 7, 2025}}</ref> || 800x600 (scaled from VGA/SVGA/XGA) || Virtual image of a 90cm screen from 2m (approximately 35 inches from 6.5 feet) || 7 ounces (198g) || VGA || Released 1998 at US$699 for 3D version.<ref>{{cite web|title=i‑glasses SVGA product sheet|website=Mindflux Archive|url=https://web.archive.org/web/20000818064717/http://www.mindflux.com.au/products/io-display/iglassesSVGA.html|access-date=7 May 2025}}</ref>
|-
|-
| Compatibility || Plug and Play portable monitor
| '''i-glasses HRV''' || High-resolution video monitor for camcorders, VCRs, DVDs. Intended for patient comfort in dental/medical settings.<ref name="PearsonDentalHRV">{{cite web |url=https://www.pearsondental.com/catalog/product.asp?majcatid=6655&catid=4529&subcatid=7091&pid=35311 |title=I-Glasses HRV (iO Display Systems) | Dental Product |publisher=Pearson Dental Supply |accessdate=May 7, 2025}}</ref> || 640x480 (each eye) || Equivalent to viewing a 70-inch monitor from 13 feet<ref name="jpdhrv">{{cite web |url=https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/ |title=i-O Display shows off PRO SVGA compatible headset at SID 2003 |publisher=Jon Peddie Research |accessdate=May 7, 2025}}</ref> || Not specified || S-Video, RCA stereo-audio, composite video (Incompatible with computer signals for the Pro version) || A "Pro" version offered better video quality and contrast. Released 1999 at US$499.<ref name="VRShop"/>
|-
|-
| 3D Support || Optional stereoscopic 3D version available
| '''i-glasses HRV Pro''' || Introduced in April 2003, used Three Five Systems Z86D-3 microdisplays<ref name="jpdhrv"/> || 800x600 (1.44 million pixels per display) || Equivalent to viewing a 70-inch monitor from 13 feet || Not specified || S-Video, composite video || Priced at $1,199 for 2D version and $1,499 for 3D-capable version in 2003.<ref name="jpdhrv"/>
|-
|-
| Refresh Rate || Double the input refresh rate up to 60Hz; above 60Hz equals input refresh rate
| '''Personal I-O Eye-Glasses/I-Glasses (GVD310)''' || Marketed for private entertainment in vehicles, public transport, and for hospital patients.<ref name="RockyAmericasGVD310">{{cite web |url=http://www.rockyamericas.com/gvd310.htm |title=Personal I-O Eye-Glasses/I-Glasses Virtual Reality Head-Mount Display (HMD) LCD - Rocky Americas |publisher=Rocky Americas |accessdate=May 7, 2025}}</ref> || 180,000 pixels (800 x 225) || Virtual 36-inch screen from 6 feet || 7 ounces (198g) for head-wear part || RCA type AV source with 2-channel stereo audio (DVD, VCD, VCR, MP4, Game Console, PC, Digital Camera, Video Camera) || Featured detachable Dolby surrounding stereo earphones and on-unit controls for volume, brightness, and contrast.
|}
|}


The SVGA models were available in both 2D and 3D-capable versions, with the stereoscopic 3D models supporting frame sequential stereo supplied by nVidia graphics card drivers or compatible applications. The i-glasses SVGA also featured an On-Screen-Display (OSD) system that allowed users to adjust settings such as brightness, contrast, audio balance, and color settings.<ref name="manual">I-O Display Systems. "I-glasses SVGA User Manual." https://www.manualslib.com/manual/631835/I-O-Display-Systems-I-Glasses.html</ref>
Common features across many i-glasses models included:
 
*  Built-in or detachable stereo headphones
=== i-glasses HRV Pro ===
*  Lightweight design for comfort during extended use
*  Adjustable head straps
*  Compatibility with eyeglasses for many users
*  Controls for display adjustments like brightness, contrast, and color


Introduced in April 2003, the i-glasses HRV Pro represented the company's more advanced offering. According to product information, the i-glasses SVGA Pro (part of this line) accepted VGA or higher input from computer sources and featured displays with 800×600 resolution, providing 1.44 million pixels per display. The viewing experience was described as similar to watching a 70-inch monitor from a distance of 13 feet.<ref name="jpdhrv">Jon Peddie Research. "i-O Display shows off PRO SVGA compatible headset at SID 2003." https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/</ref>
===i-Theater===
The i-Theater was marketed as a lightweight mobile video eyewear.<ref name="Ultimate3DHeaven">{{cite web |url=https://www.ultimate3dheaven.com/itbyigiodi.html |title=iTheater by iGlasses IO Display - Ultimate3DHeaven |publisher=Ultimate3DHeaven |accessdate=May 7, 2025}}</ref>
*  '''Resolution:''' QVGA (320x240), 230,000 pixels per [[LCD]]
*  '''[[Field of View|Field of View (FoV)]]:''' 25 Degrees Diagonal
*  '''Weight:''' 3.5 ounces (99g) without cable
*  '''Video Signal:''' NTSC / PAL / SECAM
*  '''Virtual Image Size:''' Equivalent to a 50-inch screen viewed from 8.5 feet
*  '''Power Consumption:''' Less than 450mW
*  '''Battery Life:''' 6-8 hours
*  '''Connectivity:''' Gaming Systems, VCRs, DVD players, Video iPods, Cell Phones
*  '''Patents:''' Technology protected by over 200 global patents


The SVGA Pro models were available in both 2D and 3D-capable versions, with prices starting at $1,199 for the 2D version and $1,499 for the 3D-capable version in 2003. The displays utilized Three Five Systems Z86D-3 microdisplays and were compatible with Nvidia-based graphics cards with stereo drivers.
==Technology==
I-O Display Systems developed several patented optical and tracking subsystems:


== Technology ==
=== Display Technology ===
The company's products utilized [[LCD]] technology to create [[virtual image]]s.<ref name="MindfluxSVGA"/> The i-glasses SVGA, for example, displayed a virtual image by scaling input from VGA, SVGA, or XGA sources down to an 800x600 resolution. It featured a fixed focus set at 3.9m and did not require inter-pupillary distance (IPD) adjustment. A 120Hz refresh rate was advertised to ensure a flicker-free display.


I-O Display Systems implemented various technologies in their HMD products that were innovative for consumer-level devices at the time:
Key technological innovations included:


* '''Catadioptric fiber‑optic faceplate optics''' – eliminated bulky relay lenses for a lighter visor.<ref name="Patent5642227">{{cite patent|number=US5642227|title=Optical correction for virtual‑reality and heads‑up displays|assignee=Virtual I/O, Inc.|date=24 Jun 1997}}</ref>
* '''Optical Design''': The i-glasses utilized an optical system that allowed for both immersive viewing and see-through capability (via the VideoMute feature).
* '''Optical Design''': The i-glasses utilized an optical system that allowed for both immersive viewing and see-through capability (via the VideoMute feature).
* '''Display Technology''': Over the years, the company transitioned from lower-resolution displays to SVGA-compatible microdisplays.
* '''Display Technology''': Over the years, the company transitioned from lower-resolution displays to SVGA-compatible microdisplays.
=== Tracking Systems ===
* '''Magneto‑inertial sourceless tracker''' – combined flux‑gate magnetometers with a sealed fluid‑tilt sensor to output yaw, pitch and roll without external beacons.<ref name="JustiaSensor"/>
* '''Stereoscopic 3D''': Some models supported stereoscopic 3D viewing, which was compatible with specific graphics cards and software.
* '''Stereoscopic 3D''': Some models supported stereoscopic 3D viewing, which was compatible with specific graphics cards and software.
* '''Audio Integration''': Built-in stereo sound was a standard feature across the product line.
* '''Ergonomics''': The designs aimed to provide a comfortable viewing experience despite the technological limitations of the era.


== Market Position and Competition ==
The company also held patents related to personal visual display systems, head-mounted display apparatus, depixelated visual displays, and optically corrected helmet-mounted displays.<ref name="GooglePatents5903395A">{{cite web |url=https://patents.google.com/patent/US5903395A |title=US5903395A - Personal visual display system - Google Patents |publisher=Google Patents |accessdate=May 7, 2025}}</ref><ref name="GooglePatents5991085A">{{cite web |url=https://patents.google.com/patent/US5991085A |title=US5991085A - Head-mounted personal visual display apparatus with image generator and holder - Google Patents |publisher=Google Patents |accessdate=May 7, 2025}}</ref>
 
==Market Position and Competition==


I-O Display Systems positioned itself in the consumer and prosumer segments of the early [[virtual reality]] market. During the late 1990s and early 2000s, the company competed with other HMD manufacturers such as:
I-O Display Systems positioned itself in the consumer and prosumer segments of the early [[virtual reality]] market. During the late 1990s and early 2000s, the company competed with other HMD manufacturers such as:
Line 92: Line 98:
* '''Canon''' with their HMDs
* '''Canon''' with their HMDs


The i-glasses products were generally positioned as more affordable alternatives to high-end professional VR systems while offering better quality than the most basic HMDs. Contemporary reviews often compared the i-glasses favorably to competitors like the VFX1 in terms of comfort and ease of use, though sometimes noting trade-offs in display quality or immersion.<ref name="vfxtest">VFX-1 Headgear versus I-Glasses. https://www.csoon.com/issue11/vrtest.htm</ref>
The i-glasses products were generally positioned as more affordable alternatives to high-end professional VR systems while offering better quality than the most basic HMDs. Contemporary reviews often compared the i-glasses favorably to competitors like the VFX1 in terms of comfort and ease of use, though sometimes noting trade-offs in display quality or immersion.<ref name="vfxtest">{{cite web |url=https://www.csoon.com/issue11/vrtest.htm |title=VFX-1 Headgear versus I-Glasses |accessdate=May 7, 2025}}</ref>
 
=== Market Reception ===
Early press coverage praised the light weight (227g) and competitive price compared with the Sony Glasstron, yet criticized visible pixelation and limited software support.<ref name="Wired99">{{cite magazine|title=Little Big Screen|magazine=Wired|date=1 Aug 1999|url=https://www.wired.com/1999/08/little-big-screen}}</ref> Analysts at TWICE magazine cited insufficient in-store demonstrations and fragile demo units as key barriers to mainstream adoption.<ref name="PSBJMay97"/>
 
By late 1996, the company was shipping roughly 300 units per month, with professional and medical buyers representing 25 percent of volume.<ref name="3DOWorld"/> Despite modest early sales—about 30,000 units went to U.S. dentists alone for chair-side "patient distraction" video<ref name="Wired99"/>—revenue fell short of projections, contributing to the company's financial difficulties.
 
==Legacy==
I-O Display Systems was one of the longest-running companies in the early consumer HMD market. The company was described as "one of the longest, most tenacious companies in this business" that "pioneered wearable, semi-comfortable headsets" designed to work with both PCs and video sources.<ref name="jpd">{{cite web |url=https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/ |title=i-O Display shows off PRO SVGA compatible headset at SID 2003 |publisher=Jon Peddie Research |accessdate=May 7, 2025}}</ref>


== Legacy ==
The company's contributions to VR technology include:


I-O Display Systems was one of the longest-running companies in the early consumer HMD market. The company was described as "one of the longest, most tenacious companies in this business" that "pioneered wearable, semi-comfortable headsets" designed to work with both PCs and video sources.<ref name="jpd">Jon Peddie Research. "i-O Display shows off PRO SVGA compatible headset at SID 2003." https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/</ref>
1. **Patent Portfolio**: Its patent portfolio covering lightweight catadioptric optics and magneto-inertial tracking was cited by subsequent VR manufacturers throughout the early 2000s.<ref name="Patent5642227"/>
 
2. **Virtual Cinema Concept**: The company's emphasis on an "80-inch virtual cinema" foreshadowed the media-consumption positioning later used by Sony Glasstron, Myvu, and Meta Quest "theater mode" features.<ref name="Wired99"/>
 
3. **Technological Advancements**: The challenges and innovations addressed by I-O Display Systems and its contemporaries helped pave the way for the more sophisticated immersive technologies available today.
 
4. **Historical Significance**: Surviving i-glasses units remain a reference platform for retro-VR enthusiasts and museums such as the Deutsches Museum in Munich.<ref>{{cite web|title=Virtual i‑O i‑glasses! Personal 3D Viewer|website=Google Arts & Culture|url=https://artsandculture.google.com/asset/virtual-i-o-i-glasses-personal-3d-viewer-head-mounted-display/4wHrXHZrWs9ZBA|access-date=7 May 2025}}</ref>


While I-O Display Systems is no longer in operation, its products represented an important step in the evolution of consumer [[virtual reality]] technology. The company's efforts to create accessible HMDs helped introduce the concept of personal virtual displays to a broader audience during a period when the technology was still in its early stages of development.
While I-O Display Systems is no longer in operation, its products represented an important step in the evolution of consumer [[virtual reality]] technology. The company's efforts to create accessible HMDs helped introduce the concept of personal virtual displays to a broader audience during a period when the technology was still in its early stages of development.


I-O Display Systems' products can be seen as precursors to the more advanced VR and AR headsets that would emerge in later years, such as the [[Oculus Rift]], [[HTC Vive]], and various [[augmented reality]] glasses. The challenges and innovations addressed by I-O Display Systems and its contemporaries helped pave the way for the more sophisticated immersive technologies available today.
I-O Display Systems' products can be seen as precursors to the more advanced VR and AR headsets that would emerge in later years, such as the [[Oculus Rift]], [[HTC Vive]], and various [[augmented reality]] glasses.
 
==See Also==
*  [[Head-mounted display]]
*  [[Virtual Reality]]
*  [[Augmented Reality]]
*  [[Liquid Crystal Display]]
*  [[Stereoscopy]]
*  [[Forte VFX1]]
*  [[Sony Glasstron]]
*  [[Virtuality (company)]]


== References ==
==References==
<references>
<references>
<ref name="jpdformation">Jon Peddie Research. "i-O Display shows off PRO SVGA compatible headset at SID 2003." https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/</ref>
<ref name="SistematicsFormed">{{cite web |url=https://www.sistematics.com/en/i-o-display-systems-m-353.html |title=Listado de productos por marca I-O Display Systems |publisher=Sistematics.com |accessdate=May 7, 2025}}</ref>
<ref name="xvrwiki">XVRWiki. "I-O Display Systems." http://www.xvrwiki.org/wiki/I-O_Display_Systems</ref>
<ref name="MindfluxSVGA">{{cite web |url=https://www.mindflux.com.au/products/hardware/iglassessvga.html |title=i-O Display Systems i-glasses SVGA - Mindflux |publisher=Mindflux |accessdate=May 7, 2025}}</ref>
<ref name="mindflux">MINDFLUX. "i-O Display Systems i-glasses! PC." http://www.mindflux.com.au/products/io-display/iglass_pc.html</ref>
<ref name="VRARWiki">{{cite web |url=https://xinreality.com/mediawiki/index.php?title=I-O_Display_Systems |title=I-O Display Systems - Virtual Reality, Augmented Reality Wiki - VR AR & XR Wiki |publisher=xinreality.com |accessdate=May 7, 2025}}</ref>
<ref name="manual">I-O Display Systems. "I-glasses SVGA User Manual." https://www.manualslib.com/manual/631835/I-O-Display-Systems-I-Glasses.html</ref>
<ref name="Ultimate3DHeaven">{{cite web |url=https://www.ultimate3dheaven.com/itbyigiodi.html |title=iTheater by iGlasses IO Display - Ultimate3DHeaven |publisher=Ultimate3DHeaven |accessdate=May 7, 2025}}</ref>
<ref name="jpdhrv">Jon Peddie Research. "i-O Display shows off PRO SVGA compatible headset at SID 2003." https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/</ref>
<ref name="CNETHRVReview">{{cite web |url=https://www.cnet.com/reviews/i-o-display-systems-i-glasses-hrv-review/ |title=i-O Display Systems i-glasses HRV review |publisher=CNET |date=October 29, 2003 |accessdate=May 7, 2025}}</ref>
<ref name="vfxtest">VFX-1 Headgear versus I-Glasses. https://www.csoon.com/issue11/vrtest.htm</ref>
<ref name="LXDCorp">{{cite web |url=https://en.wikipedia.org/wiki/LXD_Incorporated |title=LXD Incorporated - Wikipedia |publisher=Wikipedia |accessdate=May 7, 2025}}</ref>
<ref name="jpd">Jon Peddie Research. "i-O Display shows off PRO SVGA compatible headset at SID 2003." https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/</ref>
<ref name="PatentsMenloPark">{{cite web |url=https://patents.google.com/patent/US7224326B2/en |title=Virtual reality system - Google Patents (see Assignee details for i-O Display systems, LLC) |publisher=Google Patents |accessdate=May 7, 2025}}</ref>
<ref name="GooglePatents5903395A">{{cite web |url=https://patents.google.com/patent/US5903395A |title=US5903395A - Personal visual display system - Google Patents |publisher=Google Patents |accessdate=May 7, 2025}}</ref>
<ref name="GooglePatents5991085A">{{cite web |url=https://patents.google.com/patent/US5991085A |title=US5991085A - Head-mounted personal visual display apparatus with image generator and holder - Google Patents |publisher=Google Patents |accessdate=May 7, 2025}}</ref>
<ref name="MindfluxPC">{{cite web |url=https://www.mindflux.com.au/products/hardware/iglassespcd.html |title=i-O Display Systems i-glasses! PC - Mindflux |publisher=Mindflux |accessdate=May 7, 2025}}</ref>
<ref name="ManualsLibSVGA">{{cite web |url=https://www.manualslib.com/manual/110089/Io-Display-Systems-I-Glasses.html?page=1#manual |title=IO Display Systems i-glasses User Manual - ManualsLib |publisher=ManualsLib |accessdate=May 7, 2025}}</ref>
<ref name="PearsonDentalHRV">{{cite web |url=https://www.pearsondental.com/catalog/product.asp?majcatid=6655&catid=4529&subcatid=7091&pid=35311 |title=I-Glasses HRV (iO Display Systems) | Dental Product |publisher=Pearson Dental Supply |accessdate=May 7, 2025}}</ref>
<ref name="RockyAmericasGVD310">{{cite web |url=http://www.rockyamericas.com/gvd310.htm |title=Personal I-O Eye-Glasses/I-Glasses Virtual Reality Head-Mount Display (HMD) LCD - Rocky Americas |publisher=Rocky Americas |accessdate=May 7, 2025}}</ref>
<ref name="jpdhrv">{{cite web |url=https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/ |title=i-O Display shows off PRO SVGA compatible headset at SID 2003 |publisher=Jon Peddie Research |accessdate=May 7, 2025}}</ref>
<ref name="vfxtest">{{cite web |url=https://www.csoon.com/issue11/vrtest.htm |title=VFX-1 Headgear versus I-Glasses |accessdate=May 7, 2025}}</ref>
<ref name="jpd">{{cite web |url=https://www.jonpeddie.com/news/i-o-display-shows-off-pro-svga-compatible-headset-at-sid-2003/ |title=i-O Display shows off PRO SVGA compatible headset at SID 2003 |publisher=Jon Peddie Research |accessdate=May 7, 2025}}</ref>
<ref name="PSBJMar97">{{cite news|title=Financial reality pressures Virtual i‑O into Chapter 11|work=Puget Sound Business Journal|date=March 16, 1997|url=https://www.bizjournals.com/seattle/stories/1997/03/17/story6.html}}</ref>
<ref name="PSBJMay97">{{cite news|title=Effort to salvage Virtual i‑O fails|work=Puget Sound Business Journal|date=May 25, 1997|url=https://www.bizjournals.com/seattle/stories/1997/05/26/story4.html}}</ref>
<ref name="3DOWorld">{{cite web|title=IGlasses|website=3DO World|url=https://3do.world/index.php?title=IGlasses|access-date=7 May 2025}}</ref>
<ref name="JustiaSensor">{{cite patent|number=US5526022|title=Sourceless orientation sensor|assignee=Virtual I/O, Inc.|date=June 11, 1996}}</ref>
<ref name="Tampa97">{{cite news|title=Reality has not lived up to the promise for virtual‑reality games|work=Tampa Bay Times|date=28 Sep 1997|url=https://www.tampabay.com/archive/1997/09/28/reality-has-not-lived-up-to-the-promise-for-virtual-reality-games/}}</ref>
<ref name="VRShop">{{cite web|title=Virtual IO I‑Glasses – Specs and Info|website=The VR Shop|date=14 Feb 2022|url=https://www.virtual-reality-shop.co.uk/virtual-io-i-glasses/}}</ref>
<ref name="Patent5642227">{{cite patent|number=US5642227|title=Optical correction for virtual‑reality and heads‑up displays|assignee=Virtual I/O, Inc.|date=24 Jun 1997}}</ref>
<ref name="Wired99">{{cite magazine|title=Little Big Screen|magazine=Wired|date=1 Aug 1999|url=https://www.wired.com/1999/08/little-big-screen}}</ref>
</references>
</references>


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[[Category:Virtual Reality]]
[[Category:Virtual Reality]]
[[Category:Head-mounted displays]]
[[Category:Head-mounted displays]]
[[Category:Display technology]]
[[Category:1990s technology]]
[[Category:Defunct technology companies of the United States]]
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