Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Powerful Mini-LEDs for Thin Touchscreens

19.09.2011
Osram Opto Semiconductors has developed an infrared light-emitting diode (IRED) for use in very thin optical touchscreens. Called the SFH 4053, the small new lamps are housed in a frame surrounding a display.

The lamps create a veritable web of light that overlays the display. If a user touches the screen, the motion interferes with the light grid at that particular location, enabling the system to recognize that it is being touched. The new system takes up only 0.45 millimeters of the frame’s height and can be easily incorporated into a tablet PC. Despite its small size, the diode is powerful enough to light up a laptop display, for example.


An optical touchscreen’s components are mounted in a frame known as a “bezel,” which surrounds the display and is between 0.5 and one millimeter thick. Rows of IREDs and detectors located opposite to each other create an invisible, infrared grid. If a user taps the display, his or her finger will interrupt the light ray and the signal to the corresponding receptors will cease.

Larger displays, such as those used in notebook and all-in-one (AiO) computers are flooded with infrared light from two corners. Camera sensors located next to the IREDs only receive a signal if a finger reflects the light emitted on the display. Although this method requires few components, it does need IREDs with a very high radiant flux. The stronger an infrared LED is, the larger a touchscreen can be made with the same number of components.

Osram Opto Semiconductors is a division of the Siemens subsidiary Osram. For the new IRED, the company uses a small chip LED housing that measures only 0.5 x 1 millimeter, making it one of the thinnest on the market. The LED emits light at a wavelength of 850 nanometers, which is invisible to the human eye but can be easily detected by infrared receptors and camera sensors.

Due to the use of highly efficient thin-film chip technology, the IRED needs little electricity to emit lots of light and therefore helps to prolong the intervals between battery-charging for portable devices. The lamp has a radiant flux of 35 mW during continuous operation with a current of 70 mA. The output can be several times higher in pulse mode.

Dr. Norbert Aschenbrenner | Siemens InnovationNews
Further information:
http://www.siemens.com/innovationnews

Further reports about: LED Mini-LEDs Opto Osram Semiconductor Thin Clients Touchscreens

More articles from Power and Electrical Engineering:

nachricht Electrical fields drive nano-machines a 100,000 times faster than previous methods
19.01.2018 | Technische Universität München

nachricht ISFH-CalTeC is “designated test centre” for the confirmation of solar cell world records
16.01.2018 | Institut für Solarenergieforschung GmbH

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Artificial agent designs quantum experiments

On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.

We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Let the good tubes roll

19.01.2018 | Materials Sciences

How cancer metastasis happens: Researchers reveal a key mechanism

19.01.2018 | Health and Medicine

Meteoritic stardust unlocks timing of supernova dust formation

19.01.2018 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>