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.
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Imagine if the LED bulbs in your house could transmit high-speed data without WiFi or broadband. Or an LED-lit movie billboard that can relay high-quality promotional videos and songs to your smartphone as you pass by in a crowded mall? Well, these scenarios are not out of any sci-fi thriller — the government of India is already testing technology that can enable this and other features.
In a recent pilot project, the ministry of electronics and IT successfully tested a technology called LiFi (Light Fidelity), which uses LED bulbs and light spectrum to transmit data at speeds as high as 10 GB per second over a 1-km radius.
The pilot project was conducted in association with Indian Institute of Technology Madras at its campus along with lighting company Philips a few months ago. While the pilot was staged in a closed environment, ERNET now plans to test it in open spaces in partnership with Indian Institute of Science, Bengaluru.
What is LiFi
Oledcomm Corporation redefines the standards of connectivity and internet access with MyLiFi®. Winner of two CES Innovation Awards 2018 in the Tech for a Better World and Smart Cities categories, MyLiFi® is a LED lamp Lifi technology that revolutionizes internet by offering an ultra-fast, secure and radiowave-free connection.
LiFi (“Light Fidelity”) is a new technology that allows mobile devices (and other connected objects) to connect to each other by using LED lights. LiFi transmits data by modulating the light signals from an LED light bulb. Of course, this process is invisible to the human eye. Light signals are received and converted into data by a dongle connected to the device.
This revolutionary technology, created in 2005 by a team including Suat Topsu, President of Oledcomm, had been used for B2B purposes such as helping blind people navigate public transport systems, transmitting medical information in hospitals, and measuring travel times in supermarket aisles. But now LiFi technology is moving into homes and offices as a revolutionary new form of connectivity that is ultra-fast, secure, and that works without any radio waves.
Benjamin Azoulay, CEO of Oledcomm, says,”just as clean energies are displacing fossil fuels and propelling us towards a world of responsible innovation, light is now replacing radio waves to provide a safe, a people- and eco-friendly internet connection. MyLiFi® marks the start of a new era in connectivity. It’s the sense of history!”
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Li-Fi is the abbreviation of light fidelity and was expressed by Harald Hass who was a German physicist. In Li-Fi the information is transferred through light signals instead of radio waves and mostly Wi-Fi plays an efficient role for wireless information coverage within the buildings whereas by using Li-Fi we can provide the excel density data coverage in a particular area without any radio interference issue.
It furnishes well bandwidth, assurance than Wi-Fi and excels speed. In the coming generation, this technology will be used for transmitting data or information to smartphones, laptops etc. through the light in a room.Li-Fi or Light Fidelity refers to 5G Visible Light Communication systems using light-emitting diodes as a medium to high-speed communication in a similar manner as Wi-Fi.
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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