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Multi touch
Multi-touch technology allows for multiple touch points on a touch screen. Early versions from the 1980s supported two fingers, while modern technology can support up to 20 fingers. Multi-touch was introduced on the iPhone in 2007 and later used in other Apple products like the MacBook. It works using frustrated total internal reflection, where infrared light and cameras detect touch points. Advantages include low cost and support for high-resolution graphics. Applications include personal computers, tablets, phones, and advanced gaming.
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Multi touch
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- 2. • A touchscreen is a display which can detect the presence and location of a touch within the display area. • One point of contact at a time.
- 3. • Multi-touch technologyis an advanced human-computer interaction technique that recognises multiple touch points and also includes the hardware devices that implement it. • which allow users to compute without conventional input devices .
- 4. • Multi-touch technologydates back to 1982, when the University of Toronto developed the first finger pressure multi-touch. • In 1984 Bell Labs engineered a multi-touch screen that could manipulate images with more than one hand. • In1991 Wellner published a paper on his multi- touch “Digital Desk”, which supported multi- finger and pinching motions. History of Multi Touch…
- 5. In 2007 Microsoftintroduced Microsoft Surface. Intel Core 2 Duo processor, Windows Vista, and 2 GB of RAM.
- 7. • PP isa company founded by New York University consulting research scientist Jefferson Y. Han that creates wall displays and tables. • It can accommodate up to 20 fingers.
- 8. In 2007 theyintroduced the iPhone, marking the first time multi-touch technology was used on a phone. Later on this technology was introduced in iPod touch, MacBook Air, and MacBook Pro.
- 9. MacBook Pro iPhone Touch iPodtouch MacBook Air
- 10. IR rays obtainedon a camera
- 11. F T IR F R U S T R A T E D T O T A L I N T E R N A L R E F L E C T I O N • Total internal reflection is an optical phenomenon that occurs when a ray of light strikes a medium boundary at an angle larger than the critical angle with respect to the normal to the surface. • The critical angle is the angle of incidence above which total internal reflection occurs. • The critical angle is given by: n2= Refractive index of the less dense medium. n1= Refractive index of the denser medium.
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- 13. (a) IR viewof a touch(b)Pixel positions located on screen Frustrated Total Internal Reflection
- 14. Acrylic with led’sat its edges
- 15. IR led’s AcrylicCamera Projector Computer
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- 17. ADVANTAGES • Low costfactor. • Support high-resolution graphics. • Larger shared-display systems. • It acquires true touch image information at high spatial and temporal resolutions.
- 18. APPLICATION • Personal computers,Laptops ,Tabletops , Graphics Tablets . • It supports both LCD and CRT monitors . • Telephones ,Watches ,PDAs, Mobile phones. • Advanced multi touch Gaming with high graphics support. • Governmental, office and business purposes.
- 19. • Multi-touch technologyis an advanced human-computer interaction technique, which allow users to compute without conventional input devices .
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