Capacitive Touch Screen

Capacitive Touch ScreenEven if you have never heard of capacitive touch screens, you have been using them ever since you picked up your first smartphone or tablet.

Capacitive touch screens are made of single or multiple layers of material that are coated with a conductor such as Indium Tin Oxide. A protective cover seals the assembly off from the environment.

When another electrical conductor, like a bare fingertip or a stylus, touches the surface, an electric circuit is completed at that location. Sensors embedded in the glass then detect the location of the flow of current, which is then registered as a touch event.

This is different from the way that resistive touch technology works, where physical pressure is involved.

Capacitive touch technology can be divided into:

  • Surface Capacitive – This is a simpler form of capacitive touch screen, with only one side of the insulator coated with transparent conducting material and electrodes placed at the four corners of the screen. When a conductor touches the screen, different quantities of current will flow from the electrodes to the conductor. The location can be calculated based on the ratio of these currents.
  • Projected Capacitive – A projected capacitive touch (PCT) screen is a solid state device that has two types of electrodes, called X and Y electrodes, in separate layers running in mutually perpendicular directions. When the conductor touches the screen, the electrical field between the X and Y electrodes change and sensors can instantly pinpoint the location.

Pros of Capacitive Touch Screens

  • Can support multi touch gestures like flick, pinch and swipe
  • Are durable and robust; up to a point
  • Last longer because there are no moving parts
  • Are sensitive and even a light touch can register an input
  • Are highly responsive

The Baanto ShadowSense Advantage

If you have ever tried to use the touch screen of your phone when it is wet, or when wearing gloves, you will know the limitations of capacitive screens. Apart from being unable to perform in such situations, capacitive touch screens also have other issues.

Baanto ShadowSense touch screens are designed to overcome these issues.

Cons of Capacitive Touch Screens ShadowSense Benefits
Might not be able to work with non conductors of electricity like gloved fingers Screens work with non conductors like gloved fingers or paintbrushes
Affected by high humidity, dust and viscous fluids as they interfere with conductivity Screens work even when covered with water, ketchup, grease or foreign objects like mud
Affected by “ghosting” due to build up of static electricity, causing the screen to lock up or malfunction The screen will not “ghost”
Are costly to fabricate because of two ITO screens, and do not scale economically Screens can scale up cost effectively to sizes of 267’’ without any compromise in performance
May be affected by electrical noise and susceptible to scratches Screens cannot be scratched, even by a coin or a credit card and is not affected by electrical interference
Will not work if the screen is cut or smashed as the ITO layer will be affected Touch function is independent of the glass and screen will keep on working even if it is broken

Ready to leverage ShadowSense?

Baanto offers unparalleled touch technology through ShadowSense. Our technology outperforms other touch technologies while yielding cost savings.

Get Started Today


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