Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Powerful Mini-LEDs for Thin Touchscreens

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:

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

More articles from Power and Electrical Engineering:

nachricht 'Super yeast' has the power to improve economics of biofuels
18.10.2016 | University of Wisconsin-Madison

nachricht Engineers reveal fabrication process for revolutionary transparent sensors
14.10.2016 | University of Wisconsin-Madison

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: New 3-D wiring technique brings scalable quantum computers closer to reality

Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.

"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...

Im Focus: Scientists develop a semiconductor nanocomposite material that moves in response to light

In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.

A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...

Im Focus: Diamonds aren't forever: Sandia, Harvard team create first quantum computer bridge

By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.

"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...

Im Focus: New Products - Highlights of COMPAMED 2016

COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.

In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...

Im Focus: Ultra-thin ferroelectric material for next-generation electronics

'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.

Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...

All Focus news of the innovation-report >>>



Event News

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

14.10.2016 | Event News

Agricultural Trade Developments and Potentials in Central Asia and the South Caucasus

14.10.2016 | Event News

World Health Summit – Day Three: A Call to Action

12.10.2016 | Event News

Latest News

Seeking balanced networks: how neurons adjust their proteins during homeostatic scaling.

24.10.2016 | Life Sciences

Resolving the mystery of preeclampsia

21.10.2016 | Health and Medicine

Stanford researchers create new special-purpose computer that may someday save us billions

21.10.2016 | Information Technology

More VideoLinks >>>