Surface Capacitive versus Projected Capacitive

Views : 1797
Update time : 2018-07-05 14:50:27

What exactly is a surface capacitive touch screen?  

Surface Capacitive versus Projected Capacitive


A surface capacitive touch screen monitor consists of a touch glass overlay that has a transparent electrode layer that is placed on top of the glass itself and is then protected by a protective cover.  How does the touch function then work exactly?  The touch glass itself reacts to the static electrical transmitted from the human body to the fingertip that touches the capacitive touch glass.  The electrical charge from the touch glass transfers from the touch glass to the user and the decrease in capacitance is detected by sensors that are located from the corners of the screen.  Through this method, the controller is allowed to determine the touch point.  With Surface Capacitive touch screen monitors, the activation points can only be activated through the touch of human skin or a stylus that holds an electrical charge.  With surface capacitive touch, the screen is much more durable, has high scratch resistance and has great resistance against surface contaminants, like dust, grease, water or any other liquid residue.
 

What makes a projected capacitive touchscreen monitor different from surface capacitive?  


A projected capacitive is very similar to a surface capacitive, but has some added features that make the touch technology a bit more unique.  A projected capacitive touch has the ability to enable multi-touch that can be applicable to certain touch applications.  Since this touch glass has multi-touch capabilities, the touch function works a bit differently.  The touch glass is embedded with transparent electrode films with an IC chip that creates a three dimensional electrostatic field.  When a finger touches the screen, the electrical currents change and the computer is able to detect the touch points to determine the location touched.  Projected Capacitive touch screens are clearer than surface capacitive touch glasses, so there is excellent image clarity.  This type of touch glass is more scratch resistant than that of surface capacitive touch glass and has the multi-touch capability.  Some downsides would include sensitivity to EMI (Electromagnetic Interference) or RFI (Radio Frequency Interference) and activation can only be done with a bare finger or with thin gloves on.

This is basically how each type of touch glass functions and features that are associated.
Related News
Read More >>
4 Main Applications of AUO Displays 4 Main Applications of AUO Displays
Nov .26.2022
AUO general displays provide ultra high resolutions, sunlight readability, and long product life. Applications include ATMs, POS, kiosks, industrial computers, security monitors, entertainment machines, medical equipment, factory automation, inflight entertainment, and marine displays. AUO also provide customized designs and integrated touch solutions to enhance clients' competitive advantages.
3 Advantages of INNOLUX LCD Panels 3 Advantages of INNOLUX LCD Panels
Nov .15.2022
INNOLUX Optoelectronics provides advanced display integration solutions with innovative and differentiated technologies, including 2K, 4K ultra-high resolution, 3D naked eye, IGZO, LTPS, AMOLED, OLED, and touch solutions.
AUO, BOE and INNOLUX, Which IPS Screen is Best? AUO, BOE and INNOLUX, Which IPS Screen is Best?
Oct .25.2022
IPS screen is a technology based on TFT, and its essence is TFT screen. IPS solves the problem of viewing angle by making the apparent length of the molecule the same in all directions. AUO, BOE and INNOLUX, Which IPS Screen is Best?
Application of INNOLUX in Intelligent Medicine Application of INNOLUX in Intelligent Medicine
Oct .18.2022
INNOLUX offers a full range of smart medical solutions with the most complete medical display modules ranging from 15" to 58", including 15" XGA, 19" SXGA, 23.6" FHD and 23.8" FHD, all with 5:4 and 16:9 screen ratios, bringing wider applications for ultrasound diagnostics.