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International 2020 Elektronik 39 Optoelectronics ful signal and dazzles the photodiodes receiving the signal Since the touchscreen is mounted behind the front panel the display lies relatively deep in the housing making the edge areas difficult to read when viewed at an oblique angle Anew approach in the now familiar technology avoids these disadvantages offering a modern operating concept at the same time Infrared laser with reflection The technology known as zForce places the transmitter and receiver side by side in a striped enclosure that only needs to be mounted on one side of the display It does not evaluate the interruption of a light curtain but reflection of the emitted light by an object within sight Recognition of multifinger functions and gestures is done by the builtin controller This technology offers several advantages over PCAP touchscreens operation does not have to be carried out with a conductive object and it is insensitive to electromagnetic fields and bright ambient light System integration and Applications With infrared touchscreens the sensor is connected to the housing but not necessarily glued to the display Figure 3 shows a crosssection through the construction The display surface is located behind the front panel touch sensor and protective glass far inside the device To view the entire contents of the display the user must stand in a straight line in front of the device There are several options for integrating the zForce sensor It can be mounted either flush with the housing or on the outside of the housing Figure 4 Deposits such as dust and water above the display cannot impair its function The display moves closer to the front of the device For notebook users there are ready made strips that can be upgraded to a touchscreen notebook zForce technology is ideal for use in harsh indoor and outdoor environments where other touch principles fail It can also be used to retrofit existing systems The wide temperature range makes it easy to use in industrial environments It can be operated with any object that reflects light including protective gloves credit cards and pens Operation is no problem even with wet or dirty hands or long fingernails The touch sensor is mounted outside the display so this can be protected from environmental conditions without regard to the touch screen The touch sensor is insensitive to electromagnetic interference so it can be used in commercial vehicles agricultural equipment and machines with large electric drives The functional principle allows the display surface to be shielded against eavesdropping and not to be disturbed by radiation in a sensitive environment Of course the protection also works inwards the display opening as an entrance gate for electrical interference signals can be sealed As a smart sensor e g on a worktop made of wood or stone the sensor can also operate without a display The costs scale well with the size of the screen since in contrast to the IR touchscreen only one dimension has to be covered Even this is not a must with a selective touch area for example the onscreen menu of a large screen in a lower corner can be operated without the touch sensor having to cover the entire width of the screen Configuration as proximity sensor Depending on orientation of the laser zForce can be used as a touchscreen light barrier or proximity sensor Figure 5 shows the differences With alignment rotated by 90° the Figure 1 Functional principle of the infrared touchscreen Figure 2 Functional principle of the zForce touchscreen Figure 3 Crosssection of an infrared touchscreen system Figure 4 Crosssection through a zForce touchscreen system image HY-Line Computer Components image HY-Line Computer Components image HY-Line Computer Components