1. What is capacitive touch?
According to Oxford University, capacitance is defined as "in relation to touchscreens, which work by sensing when something electrically conductive, such as a fingertip, comes into contact with the screen.
The human body continuously sends electrochemical pulses throughout the body. When the muscle moves, it responds to the electrical current flowing through the body. Capacitive touch sensors require an electrical signal to activate. Since the body is fully charged, the button is activated with a single touch of the fingertip.
2. Touchscreen Terminology
Effective area:
The area on the touch screen where touches can be accurately detected. It is usually smaller than the viewing area.
Viewing area:
The clear and viewable area on the touchscreen. The viewing area should be the same or slightly larger than the display frame opening.
External Dimensions:
The external dimensions of the touchscreen (L x W). Silver busbars and traces are routed through the touchscreen between external dimensions and viewing areas.
Activation Force:
The force required to push the layers of the touchscreen together to register a touch.
Anisotropic Conductive Film:
A thin-film-type conductive adhesive with uniformly dispersed conductive particles that enables vertical (Z-direction) electrical connections and insulation between terminals in the X and Y directions. It is often used to glue FPC tails to circuits, such as touch screen circuits. Heat and pressure (via a heat press) are used to bond the adhesive in place.
Busbars or Electrodes:
Silver ink circuits along the edges of the touchscreen layers that distribute electricity (power). They electrically connect the ITO sensing area to the rear of the touchscreen.
Flexible Printed Circuit (FPC):
A circuit made from a Kapton™ (or polyimide) substrate with etched copper elements such as traces, connection terminations, and pads on 1 or both sides. FPC tails offer higher durability and insulation than printed PET tails. Therefore, they are often used to connect touchscreens to electronic hardware.
ITO:
Indium tin oxide. A transparent conductive coating is applied to the inner surface of the touchscreen layer.
Spacer Dots:
Use small dots of clear insulating/dielectric ink to separate the conductive layers until the layers are pressed together by a finger or stylus.
Touchscreens are commonly used in various industries. Partner with WIWO TOUCH Technology to develop your custom touchscreen solution.
Name:Yeeanl Zhang
Tel:0086-596-2607595
Email:sales09@wiwotouch.com