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What are 5 types of Touch Screen Technology? Which type is best for you?

May 16, 2022

Latest company news about What are 5 types of Touch Screen Technology? Which type is best for you?

We will interact with a touch screen constantly throughout the daily life. They are used in cell phones, ATM’s, kiosks, ticket vending machines, manufacturing plants and more. All of these use touch panels to enable the user to interact with a computer or device without the use of a keyboard or mouse. But did you know there are several uniquely different types of Touch Screens? The five most common types of touch screen are: Projected Capacitive (P-Cap), Resistive, Surface Capacitive touch, SAW (Surface Acoustic Wave), and IR (Infrared).

 

Projected Capacitive Touch Screen

 

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Projected Capacitive (P-Cap) is similar to Surface Capacitive, but it offers two primary advantages. First, in addition to a bare finger, it can also be activated with surgical gloves or thin cotton gloves. Secondly, P-Cap enables multi-touch activation (simultaneous input from two or more fingers). A projected capacitive touch screen is composed of a sheet of glass with embedded transparent electrode films and an IC chip. This creates a three dimensional electrostatic field. When a finger comes into contact with the screen, the ratios of the electrical currents change and the computer is able to detect the touch points. 

Advantages:

  • Excellent image clarity
  • More resistant to scratching than resistive
  • Resistant to surface contaminants and liquids (dust, oil, grease, moisture)
  • Multi-touch (two or more touch points)

Disadvantages:

  • Sensitive to EMI/RFI
  • Must be activated via exposed finger, or thin surgical or cotton gloves

 

Resistive Touch Screen

 

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Resistive Touch is the most widely touch technology in use today. A resistive touch screen monitor is composed of a glass panel and a film screen, each covered with a thin metallic layer, separated by a narrow gap. When a user touches the screen, the two metallic layers make contact, resulting in electrical flow. The point of contact is detected by this change in voltage.

Advantages:

  • Can activate with virtually any object (finger, stylus, gloved hand, pen, etc.)
  • Has tactile feel
  • Lowest cost touch technology
  • Low power consumption
  • Resistant to surface contaminants and liquids (dust, oil, grease, moisture)

Disadvantages:

  • Lower image clarity compared to other touch technologies
  • Outer polyester film is vulnerable to damage from scratching, poking and sharp object

 

Surface Capacitive Touch Screen

 

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In a surface capacitive touch screen monitor, a transparent electrode layer is placed on top of a glass panel. This is then covered by a protective cover. When an exposed finger touches the monitor screen, it reacts to the static electrical capacity of the human body. Some of the electrical charge transfers from the screen to the user. This decrease in capacitance is detected by sensors located at the four corners of the screen, allowing the controller to determine the touch point. Surface capacitive touch screens can only be activated by the touch of human skin or a stylus holding an electrical charge.

Advantages:

  • Better image clarity than Resistive Touch
  • Durable screen
  • Excellent resistance to surface contaminants and liquids (dust, oil, grease, water droplets)
  • High scratch resistance

Disadvantages:

  • Requires bare finger or capacitive stylus for activation
  • Sensitivity to EMI/RFI

 

SAW (Surface Acoustic Wave) Touch

 

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SAW (Surface Acoustic Wave) touch screen monitors utilize a series of piezoelectric transducers and receivers. These are positioned along the sides of the monitor’s glass plate to create an invisible grid of ultrasonic waves on the surface. When the panel is touched, a portion of the wave is absorbed. This allows the receiving transducer to locate the touch point and send this data to the computer. SAW monitors can be activated by a finger, gloved hand, or soft-tip stylus. SAW monitors offer easy use and high visibility.

Advantages:

  • Excellent image clarity
  • Even better scratch resistance than surface or projected capacitive
  • High “touch-life”

Disadvantages:

  • Will not activate with hard items (pen, credit card, or fingernail)
  • Water droplets remaining on the surface of the screen can cause false triggering
  • Solid contaminants on the screen can create non-touch areas until they are removed

 

IR (Infrared) Touch Screen

 

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IR (Infrared) type touch screen monitors do not overlay the display with an additional screen or screen sandwich. Instead, infrared monitors use IR emitters and receivers to create an invisible grid of light beams across the screen. This ensures the best possible image quality. When an object interrupts the invisible infrared light beam, the sensors are able to locate the touch point. The X and Y coordinates are then sent to the controller.

Advantages:

  • Highest image clarity and light transmission of all touch technologies
  • Unlimited “touch-life”
  • Impervious to surface scratches
  • Multi-touch (two or more touch points)
  • Palm Rejection Capability

Disadvantages:

  • Accidental activation may occur because the infrared beams are actually above the glass surface
  • Dust, oil, or grease buildup on screen or frame could impede light beam causing malfunction
  • Buildup of snow and pooling of water (such as rain) can cause false triggering
  • May be sensitive to direct high ambient light interference
  • Higher cost
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