Chair for Computer Aided Medical Procedures & Augmented Reality
Lehrstuhl für Informatikanwendungen in der Medizin & Augmented Reality

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Development of a multitouch sensor for LCD displays


Multitouch has drawn attention since the introduction of Apple's IPhone which was the first mobile device equipped with a multitouch screen. In comparison to common touch screens a multitouch screen is able of sensing more than one single touch point which makes gestures as the famous zoom function in IPhone's picture viewer possible.

There are several kinds of multitouch solutions on the market whereas every technologiy has it's own advantages and drawbacks.

Following some pros and cons of existing systems:

pro: very small and suitable for embedded devices
con: no recognition of gloved hands or objects made of plastic

pro: very high camera resolution
con: high construction depth

Microsoft's Thinsight:
pro: small construction depth
pro: optical system
con: very small resolution because of dedicated IR transmitter and receiver

Jeff Han's LED multitouch:
pro: higher resolution as Thinsight because of bidirectional use of LEDs
con: in original version not independant from the ambient light

This diploma thesis tries to combine good properties of the technologies mentioned above. The aim is a large optical sensor array which is placed behind a LCD display and which uses LEDs bidirectionally as Jeff Han's LED multitouch but without the disadvantage of being not ambient light independent.

Base of this work is a new developed version of a LED multitouch input device (picture on the right) which will be extended and further developed to meet the requirements.

Title: Development of a multitouch sensor for LCD displays
Abstract: In cooperation with Lumin, the leading manufacturer of back-projection displays, we offer the opportunity to develop, build and evaluate new concepts for multi-touch screens.
Student: Thomas Pototschnig
Director: Prof. Gudrun Klinker
Supervisor: Florian Echtler
Type: DA/MA/BA
Status: finished
Start: 2008/11/15
Finish: 2009/05/15

Edit | Attach | Refresh | Diffs | More | Revision r1.9 - 27 May 2010 - 09:52 - FlorianEchtler