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How does projected capacitive touch technology work - JFCVision


Published by JFCVision November 19,2019

Touch technology has become commonplace in human-computer interaction and is undoubtedly one of the most authoritative technologies in the digital age. Much depends on the outstanding performance of the projected capacitive touch screen


The demand for this technology continues to grow, and since we can all use projected capacitive touch screens on weekdays or leisure time, it's helpful to know how projected capacitive touch screens work.



projected capacitive touch screen



What is projected capacitive touch technology?


Today, most touch screens rely on the principle of projected capacitance. Essentially, this is the ability of the touch screen to carry a charge, and when a finger or a suitable conductive pen or object approaches, the charge is released or altered in some way.


Projected capacitive touch screens are typically made from a matrix of conductive elements on the front and back of the glass. These elements are made of a conductive material arranged in the X layer and the Y layer (with an insulating layer between them).


The conductive matrix is connected to a suitably designed touch controller that injects charge into the matrix and then monitors changes in the individual elements of the matrix. When the finger (or stylus) is close to the front of the touch screen, the capacitance field generated in the matrix behind the front glass changes slightly. The touch controller firmware should then be sufficiently complex and sensitive enough to detect these changes, identify the most variable matrix regions or elements, and "triangulating" the touch locations within the X and Y layers.

The controller then sends the data to the host in XY coordinates, which is almost the same as moving the cursor on the display with the mouse (that is, projected capacitive touch sensing).


There are two types of projected capacitive touch sensing: self-capacitance and mutual capacitance. Both have advantages and limitations, but the advantages of mutual capacitive touch sensing have made it the most widely used touch technology in the world.



cover lens  for projected capacitive touch screen



JFCVision's mission is to provide the best projected capacitive touch screen solutions for challenging environments, such as outdoor touch advertising machines, self-service kiosks, self-service POS, and interactive digital signage. Contact us:


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