Cell Phone with Built-in Projector

Mar 24, 2005
Cell Phone with Built-in Projector

Siemens researchers have developed a cell phone featuring a built-in projector system. A laboratory model was presented at CeBIT 2005 in Hanover. The system makes it possible to project a complete keypad or display onto a surface. With a special pen, users can write on the virtual keypad and operate the phone’s functions.

At first glance, the mobile phone looks exactly like a conventional cell phone. On the side of the housing there is a swivel bracket that holds the projector unit. The light source is a tiny semiconductor laser that emits monochrome light to project a real-time image of the display. Depending on the position of the bracket, the image can be projected onto a surface in front of the phone or onto a wall. The projector system can even be used to give presentations and slide shows for small groups.

The pen for writing and telephoning is kept in the side of the bracket and features a built-in microphone and speaker. The signals are transmitted via Bluetooth. A distance sensor recognizes when a user is holding the pen to his or her ear and automatically reduces the volume. To write with the virtual keypad, the user simply “types” with the pen on the projected image. Sophisticated sensor technology recognizes the pen’s position in real time.

To obtain this measurement, the researchers from Siemens Communications use a combination of ultrasound and infrared. The pen point continuously sends infrared flashes to a sensor in the phone's housing, and these flashes form the basis for the starting point of the measurements. The pen point simultaneously emits ultrasound signals that are registered at two locations in the housing. A software then determines the exact position of the pen based on the time difference between the two signals.

The demonstration model isn’t a fully functional cell phone yet. At CeBIT, a laptop was used to handle the telephone functions. It hasn’t yet been decided whether Siemens will further develop this technology and launch a mobile phone equipped with this system on the market.

Explore further: US official: Auto safety agency under review

add to favorites email to friend print save as pdf

Related Stories

Bending the light with a tiny chip

Mar 10, 2014

(Phys.org) —Imagine that you are in a meeting with coworkers or at a gathering of friends. You pull out your cell phone to show a presentation or a video on YouTube. But you don't use the tiny screen; your ...

Lawmaker reveals scale of US mobile data requests

Dec 09, 2013

US mobile carriers provided some one million records to law enforcement in 2012 related to warrants, wiretaps, location data and "cell-tower dumps," documents released by a US senator showed.

Recommended for you

US official: Auto safety agency under review

6 hours ago

Transportation officials are reviewing the "safety culture" of the U.S. agency that oversees auto recalls, a senior Obama administration official said Friday. The National Highway Traffic Safety Administration has been criticized ...

Out-of-patience investors sell off Amazon

6 hours ago

Amazon has long acted like an ideal customer on its own website: a freewheeling big spender with no worries about balancing a checkbook. Investors confident in founder and CEO Jeff Bezos' invest-and-expand ...

Ebola.com domain sold for big payout

6 hours ago

The owners of the website Ebola.com have scored a big payday with the outbreak of the epidemic, selling the domain for more than $200,000 in cash and stock.

Hacker gets prison for cyberattack stealing $9.4M

10 hours ago

An Estonian man who pleaded guilty to orchestrating a 2008 cyberattack on a credit card processing company that enabled hackers to steal $9.4 million has been sentenced to 11 years in prison by a federal judge in Atlanta.

Magic Leap moves beyond older lines of VR

11 hours ago

Two messages from Magic Leap: Most of us know that a world with dragons and unicorns, elves and fairies is just a better world. The other message: Technology can be mindboggingly awesome. When the two ...

User comments : 0