ShadowSense vs Capacitive Touch | Baanto
Even 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:
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.
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.
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Last Update : Mar 04, 2022 7:09 AM
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