A new device could make upcoming microLED displays easier to engineer and visible light communications systems, like LiFi LED, faster.
As IEEE Fellow Kei May Lau sees it, the problem with conventional LEDs, which are current controlled devices, is that turning them on and off rapidly to control brightness or using them for Li-Fi takes careful engineering and a bunch of circuitry.
“Most IC designers would rather work with voltage control device, but LEDs are current controlled devices,” says Lau. The combination of an LED’s high current and low voltage requirements makes designing drivers for them troublesome.
So she and her students invented a device, the HEMT-LED, that makes it much easier. The HEMT-LED, which is a bit like a light emitting transistor, lets you switch light emission on and off and control brightness with voltage signals.
The HEMT-LED, which is made from gallium nitride, integrates a high-electron mobility transistor (HEMT) and an LED so tightly that they merge into a single device.
Source Read More IEEESpectrum
“Smart paint” containing fluorescent and phosphorescent pigments could extend the possibilities of proposed LiFi networks, report a team led by K S Narayan at the Jawaharlal Nehru Centre for Advanced Scientific Research in Bengaluru, India. The researchers analysed the effect of nearby luminescent surfaces on the noise characteristics of visible light communication system (VLC) signals, and found that secondary emission could limit bandwidth locally by overwhelming receivers. The residual glow from phosphors could even be modulated to transmit a signal after the primary LED source has been turned off.
LiFi uses visible and near-visible light to connect electronic devices in much the same way as now nearly ubiquitous WiFi. Like its more familiar counterpart, LiFi technology is expected to play a role in connecting devices within the incipient internet of things. Unlike microwaves, however, visible-light signals cannot pass through walls, meaning that LiFi networks are, in principle, less vulnerable to eavesdropping from outside.
Know more visit http://physicsworld.com/
A inventor from Germany has claimed a major breakthrough in revolutionising how we access the internet.
Harald Haas is the man behind LIFI – a technology which allows internet data to be sent and received via LED lights.
His company, Pure LIFI, has recently released a USB dongle device that enables laptops and tablets to be connected to the burgeoning technology.
“I think it’s not a question of if, it’s a question of when,” Haas told Euronews. “LIFI is a necessity and it will come.
“This is dongle is a real breakthrough that allows us to engage larger scale projects. The pilots we have equipping a number of office environments but now we can equip a full floor of a hotel or an airport.”
How does it work?
Signals are sent via the light stream – at frequencies the human eye cannot detect – to sensors on your device and vice-versa.
But, how does the internet get into the light source?
Haas says there are two solutions and both involve sending data signals down the same cable as the light’s power source.
Who is Harold Hass Know more
The article is originally published at Euro News Read More
Wireless Fidelity (Wi-Fi) and Light Fidelity Li-Fi technologies are more demanding in recent time. There are huge business opportunities available to help new players enter the market and to collaborate with big companies to provide various products and services. Particularly for Li-Fi technology, the new start-up market is coming up with advanced products, services and solutions in the market and is expected to double in the next 5 to 7 years. In this space, cooperation and mergers and acquisition laws are expected to continue.
To understand the networking environment, the report Wi-Fi and Li-Fi markets is underlined. The report speaks about the mode, products, services, components, circles and regions deployed for both Li-Fi and Wi-Fi. In the direction of adoption of main stakeholders in the next 5-7 years, information about major trends, drivers, investments, vertical player initiatives and government initiatives can be found. Furthermore, this report gives details of the major challenges that will affect market growth.
As per research report, the Wi-Fi and Li-Fi markets are estimated to witness a CAGR of 15.0% and 61.3%, respectively during the forecast period 2016–2022.
Read more: http://www.digitaljournal.com/pr/3573190#ixzz4zN1KOMhh
This press release was orginally distributed by SBWire
Lighting systems manufacturer Lucibel announced that it has completed its first deployment of ‘LiFi by Lucibel’ in a hospital environment, installing the service in the cardiology department of the Stell clinic in the town of Rueil-Malmaison (Ile de France region). The company said that Li-Fi Internet connectivity is particularly suited to areas within hospitals where the use of Wi-Fi is not recommended or forbidden, due to the risk of interference with medical equipment. The service also offers the additional benefit of providing hospital staff with a secure connection to access patient data.
Source – Telecom Paper
What if every light bulb in the world could also transmit data? At TEDGlobal, Harald Haas demonstrates, for the first time, a device that could do exactly that. By flickering the light from a single LED, a change too quick for the human eye to detect, he can transmit far more data than a cellular tower — and do it in a way that’s more efficient, secure and widespread.
Who is Harold Haas?
Harald Haas is the pioneer behind a new technology that can communicate as well as illuminate
Read more about him Click here
Watch his Video below which is on Ted Talk . Article Excerpt from Ted Talk
LiFi is not the replacement of WiFi technology. It can be considered as incredible companion of the WiFi technology. It operates between 380 nm to 780 nm optical range. LiFi is used to exchange data incredibly rapidly and securely at much lower power level compare to WiFi.
Below is the internet architecture diagram flow
What is the Difference between LiFi vs WiFi, here are some basic and common differences between the two technologies
Below table shows your a comparision
||LiFi transmits data using light with the help of LED bulbs.
||WiFi transmits data using radio waves with the help of WiFi router.
||Do not have any intereference issues similar to radio frequency waves.
||Will have intereference issues from nearby access points(routers)
||Present IrDA compliant devices
||WLAN 802.11a/b/g/n/ac/ad standard compliant devices
||Used in airlines, undersea explorations, operation theaters in the hospitals, office and home premises for data transfer and internet browsing
||Used for internet browsing with the help of wifi kiosks or wifi hotspots
||Interference is less, can pass through salty sea water, works in densy region
||Interference is more, can not pass through sea water, works in less densy region
||In LiFi, light is blocked by the walls and hence will provide more secure data transfer
||In WiFi, RF signal can not be blocked by the walls and hence need to employ techniques to achieve secure data transfer.
|Data transfer speed
||About 1 Gbps
||WLAN-11n offers 150Mbps, About 1-2 Gbps can be achieved using WiGig/Giga-IR
|Frequency of operation
||10 thousand times frequency spectrum of the radio
||2.4GHz, 4.9GHz and 5GHz
||Works in high dense environment
||Works in less dense environment due to interference related issues
||About 10 meters
||About 32 meters (WLAN 802.11b/11g), vary based on transmit power and antenna type
||Lamp driver, LED bulb(lamp) and photo detector will make up complete LiFi system.
||requires routers to be installed, subscriber devices(laptops,PDAs,desktops) are referred as stations
Light Fidelity (Li-Fi ) is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas and is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
It is wireless and uses visible light communication or infra-red and near ultraviolet (instead of radio frequency waves) spectrum, part of optical wireless communications technology, which carries much more information, and has been proposed as a solution to the RF-bandwidth limitations.
What is Li-Fi in UAE
Source – Wikipedia