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Touch Screen

Overview

Touch screens are often used as an alternative—or in addition to—more traditional human-machine interface technologies, such as a membrane switch or keyboard. The use of a touch screen allows the keypad to be reconfigured as desired to suit the application. Because of their intuitive nature, touch screens are often used in applications where the user cannot be trained to interface with the device. Kiosks and point of sale devices exemplify these applications. Also read: Touch Feedback for Touch Screens

Touch Screen
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COMPARISON CHART
Attribute
4-Wire Resistive
Digital
Matrix
5-Wire
Resistive
Surface Wave
COST:
Touch Panel
Low Cost
Low Cost
Good, all sizes. Especially for sizes 10.4" or smaller
Moderate
COST:
Touch Controller
Low Cost
Low Cost
Moderate
Moderate
Size
Recommendation
Best for 10.4" and smaller
Good for all sizes
Good for 6.4", 8.4" and 10.4". Very good for 12.1" and higher
Good for all sizes if this high-end technology required
Scratch and Damage Resistance
Good, hard-coated
Good, hard-coated
Very Good. Hard coated and not affected by deep surface scratches
Excellent. Pure glass surface not affected by scratches
Calibration Stability
Fair, best 10.4" or smaller, required periodically
Good, calibration required at set-up and periodically, but less frequently than 4-wire
Excellent, no calibration required; drift-free
Excellent. No calibration required; drift-free

Life

Good 1 million + touches
Good, 1 million + touches. Best for instrumentation and most industrial automation
Very Good. 35 million + touches. Best for retail POS and industrial automation
Very Good. 50 million + touches. Best for unattended POI

SPECIFICATIONS AND SELECTION GUIDE
Touch screen: analog resistive
Provided Sizes: 3.8" - 20.1"
Optical
Film – anti-glare/polish, anti-reflective
Light Transmission – 80% standard; 85% VLT available
Electrical
Insulation Impedance – 20M ohm or >@ DC 25V
Operation Voltage – DC 5V (Max 5.5V, 3.3V available after customization)
Linearity – 98.5% (bias less than 1.5%)
Chattering Time – 10msec or less mechanical
Mechanical
Input Method – finger, pen or gloved hand
Touch Activation Force – 125 Grams
Surface Hardness – scrape hardness 4H of ASTM D3365 and 3H JIS K5400
Supported Operating Systems
MS-DOS, Windows 95/98, Windows XP, Windows CE, ME/2000NT, MAC, Linux, Unix
Sensor Thickness (Film on Glass)
1.40 +/-0.21mm – available
2.13 +/-0.21mm – available
3.35 +/-0.21mm – developing
*Custom thicknesses available
Reliability
Operation Temperature – -20ºC, -60ºC, <50% relative humidity dew condensation
Storage Temperature – -40ºC, -70ºC, <50% relative humidity dew condensation
Humidity – 50ºC at 90% relative humidity or lower for 240 hours, no dew condensation
Touch Durability – 35 million touches in a single location*
Pen Hitting Durability – 6 million*
Pen Sliding Durability – 500,000 strokes*
*350 gram force NEMA 4, 12 and IP 65 capable
Durability / Reliability
Chemical Resistance: ASTM F 1598-95 – 6% HC1, 40% H2SO4, 10% NaOH,
gasoline, acetone
ASTM D 1308-87 – beer, tea, coffee, cola, ink, bleach
Warranty: 2-year standard warranty. Long term warranty available.

 


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