Electronic Components Datasheet Search |
|
SFH4258 Datasheet(PDF) 1 Page - OSRAM GmbH |
|
SFH4258 Datasheet(HTML) 1 Page - OSRAM GmbH |
1 / 14 page August 13, 2010 page 1 of 14 Emitters and Detectors for Infrared (IR) Touchscreens Application note 1. Introduction Touchscreens as a popular user interface are more and more common. Applications span from public information systems to customer self-service terminals. Thus, as a logical step, more and more devices today feature this kind of user interface, e.g. bank automatic teller machines (ATMs), personal digital assistants (PDAs), mobile phones and PC displays. The widespread popularity is actively supported by standard computer based operating systems, like e.g. Windows® 7. The rapid development of CMOS imaging sensors and the development of high power infrared (IR) emitters in slim packages have led to a series of new optical touchscreen technologies. Many of them contain proprietary technology and solutions. Tab. 1 presents a general overview of different technologies and their features. This paper will give an overview on IR-based touchscreen technologies with a special focus on infrared emitting diodes (IREDs) and photodetectors to be used in such applications. It shall help touchscreen designers to select suitable IR components for their system and provide some general optoelectronic guidelines. Traditionally, IR touchscreens have faced three criticisms: Size, cost, and ambient light sensitivity. The first two concerns stem from traditional matrix-based systems. However, new technology and slim packages enable a significant decrease in bezel height combined with a decrease in cost. Camera- based systems go even further by reducing significantly the number of parts at the cost of added computing and software Feature Resistive Capacitive Surface acoustic wave IR matrix- based IR camera- based IR projector- based In-cell optical Clarity of image quality - o + ++ ++ ++ ++ Resolution + + o - ++ ++ ++ Cost effective for larger screens - - - - ++ ++ + Resistance to vandalism - - + + + ++ o Stable calibration - + + ++ ++ ++ ++ Easy to manufacture + o o + + + + Retrofit possibility ++ o - ++ ++ - - Any object can create a touch o - o ++ ++ ++ - Touch accuracy o + + o ++ ++ + Multitouch capability - + o + + + + Ambient light insensitivity + + + - o - - Sealable, resistance to dust + + - + ++ + o Main market s m m m/l m/l l s Table 1: Summary of touchscreen technologies and their features. (++: excellent, +: good, o: ok, -: does not perform well/does not have this function, screen size: s: small (2” – 10”), m: medium (12” – 30”), l: large (>32”)) |
Similar Part No. - SFH4258 |
|
Similar Description - SFH4258 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |