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SURFACE ACOUSTIC WAVE (SAW)

 

How it Works
Specifications 

TYPES OF SAW


STANDARD SAW


TEMPERED SAW


PROTECTED SAW

Surface Wave Technology is the optical standard of touch. Its pure glass construction provides superior optical performance and makes it the most scratch-resistant technology available. It's nearly impossible to physically "wear out" this touchscreen. is widely used in kiosk, gaming, and office automation applications and is available for both flat LCD panel and CRT Monitors.

SAW Touchscreen Benefits :

  • Surface wave (also known as surface acoustic wave, or SAW) technology.
  • Pure-glass touchscreens for superior image clarity, resolution, and light transmission.
  • Durable, scratch-resistant glass surface—continues to work if scratched.
  • Stable "drift-free" operation—for touch response that's always accurate.
  • Finger, gloved hand, and soft stylus activation.
  • Fast touch response.
  • Sensitive touch response—recognizes location and amount of pressure applied.
  • Dirt and splash sealed capability.
  • Custom size for OEM available.

Applications

  • Point-of-information kiosks
  • Computer-based training
  • Electronic catalogs
  • Multimedia marketing
  • Public pay phones
  • Vending and ticket sales
  • Banking/financial transactions
  • Industrial control rooms
  • Gaming, lottery, and amusement

 Available Size

LCD flat display: from 6.4" – 23.1"
CRT display: in spherical and flat display from 15"-21”

 


How SAW Touchscreen Works
 

Surface-Wave touch technologies have a glass overlay with transmitting and receiving piezoelectric transducers for both the X and Y axes. The touchscreen controller sends a electrical signal to the transmitting transducer, which converts the signal into ultrasonic waves within the glass. These waves are directed across the front surface of the touchscreen by an array of reflectors. Reflectors on the opposite side gather and direct the waves to the receiving transducer, which reconverts them into an electrical signal—a digital map of the touchscreen surface.

When you touch the screen, you absorb a portion of the wave traveling across it. The received signal is then compared to the stored digital map, the change recognized, and a coordinate calculated. This process happens independently for both the X and Y axes. By measuring the amount of the signal that is absorbed, a Z-axis is also determined. The digitized coordinates are transmitted to the computer for processing.
 

 


Surface Acoustic wave (SAW) Touchscreen Specifications  
 

Mechanical 

Construction:                           Glass panel with transducers attached to the front surface of the glass.

Positional Accuracy:                Standard deviation of error is less than 0.080 in (2.03 mm). Equates to less than ±1% error on most displays.

Touch point Density:                More than 100,000 touchpoints/in² (15,500 touchpoints/cm²).

Touch Activation Force:           Typically less than 3 ounces (85 grams).

Expected Life Performance:      No known wear-out mechanism, as there are no layers, coatings, or moving parts. SAW technology has been operationally tested to more than 50 million touches in one location without failure, using a stylus similar to a finger (Unlimited touch life).

Sealing:                                   Unit can be sealed to protect against splashed liquids, dirt, and dust.

Surface Durability:                   Surface durability is that of glass, Mohs' hardness rating of 7.

Touch Resolution:                 4096x4096, size independent.

Optical

Light Transmission:                  up to 92%.

Environmental:                        Operating: -20°C to 50°C;           Storage: -40°C to 71°C.

Operating Relative Humidity:    90% RH at 40°C, no condensing.

Chemical Resistance:               The active area of the touch screen is resistant to all chemicals that do not affect glass.

Altitude Operating:                   10,000 feet.

Storage/transport:                    50,000 feet.

Electrostatic Protection:           Meets Level 4 (15 kV air/8 kV contact discharges).

Fire Retardation:                      Meets the requirements of UL 94HB.   


For Tempered SAW only

 1. Construction: Pure 6mm-thickness heat strengthened glass with transducers attached
to the beveled edge of the glass.
 
 2. Break Resistance
Meets UL-1950 Steel Ball Drop Test
A 1-pound steel ball drops from height of 130 cm onto the center of the
Glass without breaking.
 



For Protected SAW only

 1. Construction
Pure 6mm-thickness heat strengthened glass with transducers attached
On the edge of the glass surface.
The reflectors and transducers are sealed inside the ABS plastic frame.

 2. Break Resistance
Meets UL-1950 Steel Ball Drop Test
 
 3. Dustproof
The ABS plastic frame around the panel prevents dust and dirt from
accumulating on the reflectors and transducers.
 
 4. Waterproof
Special glue is applied to the gap between the ABS plastic frame and
glass substrate to prevent water infiltration.
 
 Test Method: Set the touch screen horizontally, and pour water on the
panel surface without overflow over the ABS plastic frame. The panel
surface is soaked in water for 1 hour. The panel is in normal condition
after water poured out and dried.

 

 

 

 
 


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