Retinal Display:
Virtual Retinal Display (VRD), a screenless display technology allowing the image directly to be projected on to the retina. In VRD, no real image is produced. It just beams the image to our eye balls directly. The user will feel that the display is floating in the space in front of him. Retinal Scan Display and Retinal Projector are some common popular names of it. Compared to other displays, it uses narrow band color, coherent light and allows short transient light emission. The VRD was initially invented by Kazuo Yoshinaka in 1986.Later work at the Human Interface Technology Lab at University of Washington had brought out a VRD system in 1991.Now VRD is under more research.
VRD uses a photon source generating a coherent beam of light. Laser Diode like coherent source will help the VRD to give a diffraction limited spot on retina. The light beam from the photon source is intensity modulated. Intensity Modulation of light beam is done generally to match the intensity of the image. Now the modulated beam undergoes beam scanning. Beam Scanning allows keeping image pixels properly on the retina. In the beam scanner both raster mode and vector mode scanning takes place. After the scanning process, the optical beam projection to the retina takes place. When the coplanar property between the entrance pupil of the user and the exit pupil of VRD is achieved, a spot like beam will be focused to the eye. The spot focused through the eye will draw an image on the retina. Drive electronics will allow synchronization of scanner, modulator and coming video signal. Through synchronization a stable image will be formed. Its said that more compact VRDs will be available with the MEMS technology.
Bionic lenses use components like electric circuit with red light-emitting diodes, a sensor and a micro size silicon chip for visual display. Controlling the display intensity and all functions by voice is the major feature. Infrared rays help transfer of information within the lenses. Many research and developments are taking place with these lenses.
Synaptic Interface:
Synaptic Interfaces does not use light at all and the visual image is directly given to the brain. The technology is in the advancement mode and it is now been tested on humans too. This is useful for security system, effective communication, education, business, planning and broadcast. Success was achieved in sampling video signals from eyes of horseshoe crab through their nerves. Also, the video signals from electronic cameras into the creatures' brains were also sent successfully.
Brain-computer Interfaces allows direct communication between the brain and the external device. Brain Machine Interface, Mind Machine Interface, Direct Neural Interface and Synthetic Telepathy Interface are some common names by which they are known. Can you guys imagine a computer been controlled using our mind? Then this imagination is coming to a reality through synaptic interfaces. Recently Duke University reported that by connecting the brains of two mice over the Internet, the mices were able to cooperate and perform tasks. In 2013 Harvard University reported that they established a link between the brains of rat and human.
In 2013, MIT reported that they have implanted false memory into the brain of a mouse. Now much research is taking place related to this. The advancement in the technology will make the future world in such a condition that even a blind person can drive vehicles.
Screenless Display Advantages & Disadvantages
The products belonging to this emerging technology bring out many advantages compared to the existing products with the old technology. While taking the images into consideration, the present screenless displays have the ability to present 3D images, far point images and an image with higher resolution one. Good brightness and contrast and large angle of view are the other essential advantages. With the increasing use of the screenless products, we can expect a decrease in the cost also in the coming future. Lower power consumption, light weight, and providing better privacy are some essential advantages achieved in all the smart screenless display products. The screenless displays will boost up the field of entertainment at a great stage.
Disadvantages faced now are basically the higher cost and limited availability of the screenless display products. Most of the technologies required for the outward of screenless display are in development stage only. Many problems related to eye sight can arise since the products require close interaction with the eye.
Futurescope of Screenless Display
Screenless Displays is on the way of progress. Technological experts are taking great efforts in researching the topic day by day, so we all can expect a great revolution in the field of displays. Many IT companies and the best labs in the world are trying to bring out many products. The coming era will surely be a virtual world more than our expectation. In 2001, Microsoft Company has started their project on Interactive Table. Many innovations are coming out in the near future related to this. Google is researching more on screenless tablet computers and smartphones, eventhough they have proposed a system based on the concept of virtual image. Also, Google is developing a compact video camera which uses this new advancing technology.
Its said that the electronic beam lithography will surely help the future screenless display. So many labs are under research to bring out more advancement. For Artificial Retinal Displays, the technology of microvision must be enhanced. Microvision technology can bring out many exciting screenless display products. So, the technology is under research and development for the better future of screenless display. Companies are working out to bring more screenless mobiles, TV’s, cameras and laptops for the coming generation. Intelligent Glasses that can translate foreign text while reading is a current innovative product brought out by Japan. The product will allow the wearer manipulating virtual images in their field of view. More advancement is taking place with the product, so that the size, weight and battery life can be improved. Adobe Systems are working to bring out more innovations. Its said that by 2020, the world will become a virtual one and more exciting.
ARTICLE REFERENCE: MEPITS
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