Category Archives: LEDS

Connect with a New Type of Li-Fi

Many of us are stuck with slow Wi-Fi, and eagerly waiting for light-based communications to be commercialized, as Li-Fi promises to be more than 100 times faster than the Wi-Fi connections we use today. As advertised so far, most Li-Fi systems depend on the LED bulb to transmit data using visible light. However, this implies limitations on the technology being applied to systems working outside the lab. Therefore, researchers are now using a different type of Li-Fi using infrared light instead. Read more [...]

OLED Lighting in the Auto Industry

In recent years, a number of industries have started using Organic Light-Emitting Diodes (OLEDs) in diverse ways. The automotive industry, in particular, has seen a huge potential in OLEDs. For instance, very soon Audi will be coming up with OLED taillights. At present Audi has presented prototypes of the taillights. At the LOPEC Congress, Audi provides advanced insights into the needs of the automotive industry that the deployment of OLEDs will require to meet, and the future of automotive lighting. So Read more [...]

What is a QLED?

Recently, Samsung has announced their new TV technology using QLEDs to counter the OLED TVs that LG and others have put on the market. QLED stands for Quantum dot LED, and though Samsung has been using the concept of quantum dots in its TVs for quite some years now, they claim they will be bringing out several flavors of the QLED technology. According to Samsung, QLEDs are transmissive, as LCDs are, and light goes through several layers to create an image on the surface of the screen. The company Read more [...]

Multicolored LEDs Create Secondary Colors

Any student of physics knows mixing two primary color light sources produces a secondary color. For instance, mixing the primary colors red and green creates the secondary color yellow. There are three primary colors—Red, Blue, and Green. This process is easily seen in tricolor and RGB LEDs. There is a disadvantage in this method. As two primary colors are necessary for generating a secondary color, two LEDs must remain turned on at the same time. Therefore, generating a secondary color means Read more [...]

Dual Function LEDs & Multifunctional Displays

At the University of Illinois at Urbana-Champaign, researchers have made dual-function nanorod LEDs that could double as multifunctional displays. The researchers are also working with Dow Electronic Materials in Marlborough, Massachusetts. The LEDs are made of tiny nanorods arrayed in a thin film. They could enable new interactive functions and multitasking devices. The researchers report their advances in the February issue of the journal Science. According to Moonsub Shim, Professor of materials Read more [...]

Controlling RGB LEDs via the Raspberry Pi

Digital gates are great for switching LEDs on or off. Micro-controllers are even better and so are single board computers. That is because they contain several gates to control the LEDs. To top it all, you can program single board computers such as the RBPi or Raspberry Pi to control several LEDs individually to run at different on/off cycles. Additionally, multiple color LEDs are available, such as RGB LEDs, with which you can generate any combination of the basic red, green and blue colors. Although Read more [...]

Quadriplegics Can Control Exoskeletons with Their Brain

Artificial limbs help people who have lost a part of their arms or legs to regain partial functionality of their extremities. However, for those who have lost control of a major part of their bodies and thus rendered quadriplegic, artificial limbs are not of much use. For addressing such and other whole-body disabilities, exoskeletons are showing great promise. Scientists working at the Technische Universitat Berlin and Korea University are creating such lower-limb exoskeletons. The control system Read more [...]

LED Light Guides Equal OLED Performance

The visual impact of OLED panels is hard to resist. Their luminosity is seductively stylish and sleek. Fashion-forward lighting designers prefer the eerily-even silky glow of the OLEDs, even though these are more expensive, have a short lifetime and can be damaged more easily than other light emitting panels. Now GLT or Global Lighting Technologies, with their edge-lit LED-based light guide technology, is about to turn the tables on OLEDs. The latest product from GLT, a 4x4 inch LED-based light Read more [...]

LED myths and truths

People tend to make up myths about things not understood properly. For example, we have been using incandescent bulbs for over 100 years now, and some think they offer the best illumination possible. Studies related to energy consumption and investigations into the spectral light distribution have debunked this myth about incandescent lamps being superior. People are readily moving over to fluorescent types and lately, to LED types for meeting their illumination requirements. However, the fear of Read more [...]

Why is Li-Fi better than Wi-Fi?

Imagine wandering through an art gallery with your PDA. As you reach an interesting canvas, your PDA starts downloading information about the painting. When you move to another, your PDA displays content relative to the current piece of art. This is called content fencing – tailoring information to specific locations so that users receive information relevant to their current location. Content fencing is impossible to achieve with Wi-Fi – radio waves have a far greater spreading power. However, Read more [...]