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 Silicon solar cell of ISFH yields 25% efficiency with passivating POLO contacts
08.12.2016 | Institut für Solarenergieforschung GmbH

nachricht Robot on demand: Mobile machining of aircraft components with high precision
06.12.2016 | Fraunhofer IFAM

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: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>