Low cost optical multi-touch tables: projected versus LCD optical

Abstract

Based on our experience, in this paper we present the main aspects of two different approaches to implement low cost multi-touch tables: projection based and LCD based. The former uses a video projector to build a feedback image on the surface of a multi-touch table and the latter uses an LCD display for the same purpose. We discuss the main advantages and disadvantages we have faced during our design and building experiences

Keywords

• multi-touch tables
• surface
• tactile
• interaction
• optical systems
• projector
• lcd
• interface