How does a capacitive touchscreen work?
Capacitive touchscreens are made of a thin layer of conductive material, such as copper or indium tin oxide (ITO), printed on the underside of the display’s insulating outer layer. When a finger touches the screen, a small amount of charge is attracted to the point of contact, which effectively becomes a functioning capacitor. The resulting change in the electrostatic field is then measured to pinpoint where the contact occurred.
Types of capacitive touchscreens
There are two key types of capacitive touchscreen technology – projected and surface. Surface capacitance is the more basic of the two technologies, where only one side of the insulator is coated with a conductive layer. In contrast, projected capacitance utilizes a matrix of rows and columns of conductive material on one or two layers. This grid pattern enables excellent accuracy and multi-touch capabilities.
Advantages and disadvantages of capacitive touch screen
looks sharper and brighter
Capacitive touch screens use glass substrates, which have higher transparency than the plastic films used in resistive touch screens. Additionally, optical bonding and glass surface treatments give CTPs good image quality and contrast.
Better human-machine experience
Because capacitive touchscreens register touches through body currents, they require less operating pressure than resistive touchpanel glass. It supports touch gestures and multi-touch, which makes it a better user touch experience.
Due to the extremely high hardness (>9H) of the cover glass used on the front, it is very durable for touches that can exceed 10 million touches. It also resists scratches and is easy to clean, making it mainstream for resistive touch panels.
size and appearance
Capacitive touch screens can be made in extra-large sizes (100 inches), and the cover can be decorated with different colors, shapes, and holes, providing users with flexible designs.
The capacitive touch screen manufacturing process is relatively more expensive and the cost can be high.
Immunity to on-screen objects/contaminants
Capacitive touchscreens require special design and use of special controllers for special applications, such as touching with gloves, or environments with water or salt water. The cost may be higher.
The cover may break. To keep glass fragments from flying, filming or optical bonding is required during the manufacturing process, making it more expensive.
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