Tag Archives: cellphone

Now Screen movies using your phone….!!

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A new mini projector prototype could see mobile phone users hosting impromptu movie screenings on makeshift screens such as white towels or walls… without killing the battery. Unlike conventional projectors the prototype doesn’t need an additional illumination system. Instead it relies on a lens system to project images produced by an OLED onto a wall or other flat surface.

Operating without an extra light source offers the dual benefits of reduced size and energy requirements. The prototype is 2.5 cm long, has a diameter of 1.8 cm and needs very little energy. This means the projector could be easily integrated into a mobile phone or PDA without overtaxing the devices’ battery.

Currently the prototype’s OLED display produces a monochrome image with a brightness of 10,000 candelas per square meter, and color images about half that level. By way of comparison, a computer monitor generates about 150-300 candelas per square meter.

The lenses used in the prototype are made of glass, but the development team is working on an optical system that uses plastic lenses. This is because plastic lenses can be embossed, so they can be produced in larger quantities more simply and cheaply than glass lenses.

The mini projector was developed by research scientists at the Fraunhofer Institute for Applied Optics and Precision Engineering IOF in Jena in cooperation with their partners in the EU project HYPOLED.

Source: Fraunhofer Institute

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Pocket Cellphone Charger

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Product: Fuel-cell recharger

Cost: Initially between $100 and $200; cartridges will cost between $1 and $3.

Company: Lilliputian Systems

Solid-oxide fuel cells can generate electricity using a range of readily available fuels. But because they run very hot–often above 1,000 ºC–they typically require insulation that makes them bulky. A new version employs an insulation technique that keeps the finished device as small as a pack of playing cards. The gadget, which could help keep electronic devices humming on long flights or hikes, runs on cheap butane cartridges; one cartridge packs enough power to recharge a smart phone 20 times. Swap out the cartridge, and it’s ready for 20 more charges. The device is scheduled to go on sale next year.

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Source

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Dyson Human Energy Harvesting Bracelet

Dyson Energy Bracelet is a gadget that uses Seebeck effect to harness energy and power your mobile phones for a few precious minutes more, when you desperately need it. Lemme explain a bit: The thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa. This typically includes three separately identified effects, the Seebeck effect, the Peltier effect, and the Thomson effect. This is coz three different guys discovered it around the same time, however Peltier–Seebeck and Thomson effects are reversible and Joule heating is not.

The designers explain:

Thanks to the Seebeck effect, the temperature difference between the surface which touch the skin and the other which is in the ambient air allows to produce electricity that is stocked in a battery. When the user needs to recharge a mobile device, he plugs it into the Dyson Energy through a micro-USB port (universal connector imposed to constructors in 2012) and can have some additional minutes in use.

Firstly, we have tested the Peltier element in its most common use: i.e. the creation of heat and coldness on the same component (Seebeck effect), and we have noticed that there was electricity production. We have met an engineer who allowed us to evolve on our project while explaining us that there was not possible to plug the elements serially. Therefore, we chose to work with only one element. As a result of many calculations, we have validated this technology payoff regarding our concept. For instance, some hours are sufficient to power its cellphone for a dozen minutes of communication.

Designers: Mathieu Servais, Camille Lefer, Clément Faydi & Mickaël Denié

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