Mini beamer in a cellphone or PDA

June 2, 2009
Model of the mini beamer: the OLED display can be seen to the right at the back. The lens system projects the image onto a wall. © Fraunhofer IOF

( -- Looking at photos on a cellphone display can be somewhat arduous. A new mini beamer will make it easier. The beamer is so small that it can be integrated in a cellphone or a PDA. As it does not need an extra light source it also conserves the battery.

A summer barbecue by the lake - as the sausages sizzle on the grill some of the party would like to watch the soccer on TV. Today, a choice has to be made whether to stay by the lake or watch the match on a big public screen or the TV set at home. In future, barbecue enthusiasts and football fans will be able to enjoy both at the same time. Cellphone TV is coming closer and with an innovative mini beamer it will be possible to create a public viewing event on a small scale - for example on a white bathing towel by the side of a lake.

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. Unlike conventional beamers it does not need an additional illumination system. Because the beamer can operate without an extra light source it offers a number of advantages: Firstly, it takes up little space. The prototype is 2.5 centimeters long, has a diameter of 1.8 centimeters and can be easily integrated in a cellphone or a PDA. Secondly, the device needs very little energy and therefore does not overtax the battery.

“The key component of the projector is an organic display, or OLED, developed by our colleagues at the Fraunhofer Institute for Photonic Microsystems IPMS in Dresden,” says Dr. Stefan Riehemann, group manager at the IOF. Currently the OLED display produces a monochrome image with a brightness of 10,000 candelas per square meter; for color images the brightness is about half that level. By way of comparison, a computer monitor generates about 150-300 candelas per square meter. A lens system projects the image produced by the OLED onto a wall or other flat surface. The lenses are made of glass but the research scientists are already developing an optical system which uses plastic lenses. As plastic lenses can be embossed, they can be produced in larger quantities more simply and cheaply than glass lenses.

At the Laser World of Photonics trade show from June 15 to 18 in Munich, the researchers are exhibiting a monochrome prototype.

Provided by Fraunhofer-Gesellschaft (news : web)

Explore further: Samsung SDI Develops Largest Ever Active-Matrix OLED Display

Related Stories

Samsung SDI Develops Largest Ever Active-Matrix OLED Display

May 20, 2004

May 20, 2004 (SEOUL) -- Samsung SDI Co, Ltd of Korea, a flat-panel display affiliate of the Samsung Group, said on May 18 it has developed the world's largest active-matrix (AM) organic light-emitting diode (OLED) display ...

Measuring in 3-D

April 16, 2008

Today, complex optical free-form geometries are used primarily in car headlamps and in optics for cameras and digital projectors. These optical components are expensive to manufacture and to test. At Hannover-Messe on April ...

Recommended for you

Toyota promises better mileage and ride with Prius hybrid

October 13, 2015

Toyota Motor Corp. released details for its fourth-generation Prius on Tuesday, promising that improvements in the battery, engine, wind resistance and weight mean better mileage for the world's top-selling hybrid car.

Facebook to test mobile app shopping tab

October 12, 2015

Facebook said Monday that it will begin testing a shopping tab for its mobile app as it works to ramp up advertising and online commerce offerings.


Adjust slider to filter visible comments by rank

Display comments: newest first

not rated yet Jun 02, 2009
Interesting, but hard to believe that it would be more visible, or have the power to cover a larger area, than, say, the screen on a typical smart phone.
1 / 5 (1) Jun 03, 2009
According to the HYPOLED website, the expected target, or viewing screen is only 12.4cmX9.3cm with a brightness of 100cd/m2 with the device drawing 100mw.

The active display area of the device is only about 44.25mm/2

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.