Projected capacitive Touch screen

Projected capacitive touch screen

Obeytec Projected capacitive touch screen (PCAP touch screen or PCT touch screen) technology is a variant of capacitive touch technology but where sensitivity to touch, accuracy, resolution, and speed of touch have been greatly improved by the use of a simple form of “Artificial Intelligence”. This intelligent processing enables finger sensing to be projected, accurately and reliably, through very thick glass and even double glasses.

Obeytec some new model PCAP touch screens are composed of thousands of discrete keys, but most PCAP touch screens are made of a matrix of rows and columns of conductive material, layered on sheets of glass. This can be done either by etching a single conductive layer to form a grid pattern of electrodes or by etching two separate, perpendicular layers of conductive material with parallel lines or tracks to form a grid. In some designs, the voltage applied to this grid creates a uniform electrostatic field, which can be measured. When a conductive object, such as a finger, comes into contact with a PCAP panel, it distorts the local electrostatic field at that point. This is measurable as a change in capacitance. If a finger bridges the gap between two of the “tracks”, the charge field is further interrupted and detected by the controller. The capacitance can be changed and measured at every individual point on the grid. This system can accurately track touches.

Due to the top layer of a PCAP touch sensor being glass, it is sturdier than less-expensive resistive touch technology. Unlike traditional capacitive touch technology, a PCAP system can sense a passive stylus or gloved finger. However, moisture on the surface of the panel, high humidity, or collected dust can interfere with performance. These environmental factors, however, are not a problem with ‘fine wire’ based touchscreens because wire based touchscreens have a much lower ‘parasitic’ capacitance, and there is a greater distance between neighboring conductors.

TechnologyPCAP touch screen/PCT touch screen (Projected Capacitive touch screens)
Size Available Sizes from 7″ to 86″
Number of TouchesMulti Touch (5-20 Points)
Input MethodsFinger
Passive stylus
Light Transmittance≥85% ± 3%
Overall Thickness3.4mm
Cover Glass Thickness2.8mm tempered glass
Surface TreatmentAnti-Glare Option
Anti-Fingerprint Option
Anti-Bacterial Option
Privacy Filters Option
Colored Borders Option
Printed Icons Option
Customizable SerivceBonding LCD
DurabilityOver 50 million touches in one location
Positional Accuracy± 2.0mm
InterfaceUSB, I2C, Serial/Com
Report Rate>100 Hz
Operating SystemWindows XP
Windows 7
Windows 8
Windows 10
UtilitiesMultiple lcd/led monitor
Various touch modes Touch zones
Operating Temperature0°C to 60°C
Humidity95% (Non Condensing)
Safety ApprovalsCE FCC
Warranty1-year limited warranty
NoteActual technical specifications are dependent on multiple design variables including touch IC and screen size. Values above are for reference only.
Projected capacitive Touch screen Specifications
Model No.Glass OD(mm) Glass VA(mm)Sensor OD(mm)Sensor AA(mm)ICApplicationinterfaceThickness
OB070P00-3K-C00182.3*122155.2*87.1168.92*103.93156.2*88.09ILI2511Controller on CableUSB3
OB080P00-3K-C00214*137177.6*100.2189.64*116.09178.6*101.2ILI2511Controller on CableUSB3
OB084P00-3M-C00223*179171.4*128.8181.15*140.8172.4*129.8ILI2511Controller on CableUSB3
OB101P00-3K-C00251.3*174217.96*136.6227.5*149216.3*163.5ILI2511Controller on CableUSB3
Projected capacitive touch screen summary list
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Projected capacitive Touch screens Drawing Download