Wednesday, December 9, 2009

Technology notes for a multi-touch device.



Screen Resolution

iPhone 320x480
new iPod 640x480
Wacom Cintiq 12WX 1600x1200

Touch resolution
Can be smaller than screen resolution

Newspaper-like UI
Magazines 133-150 lpi 200 dpi
Newspapers 85 lpi 150-200 dpi
High-quality book 200 lpi

Programming interfaces
Multitouch for Java
Qt 4.6 (Low-level and/or gesture events; not mature; LGPL)

Operating System support
Windows CE
Embedded Linux
Qt Embedded


Common technologies
E-paper (low resolution & refresh rate, no backlight needed)
OLED (expensive)
LCD (backlight needed)

Gesture support/pressure-sensing
Gesture support: need 2 points of contact
Pressure sensing: not needed

Overall suggestion of technology
LCD, capacitive touchscreen, Qt Embedded for software

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