Why is there touch response randomly on my TD2220/TD2421 even nobody touches the screen?

These models are optical touch monitors which use two CMOS cameras (optical sensors) placed in the corners at the top of the screen as well as three reflectors (light strips).

These cameras are used to look across the entire touch surface for touch events.

When an object touches the screen, it blocks some of the light being received by the sensors in the cameras.

The location of the touch is then calculated by using the information from both cameras and the mathematical principles of triangulation.




Performance may be affected by direct sunlight or reflections from wet or shiny surfaces.

That’s why it’s observed to receive touch signal randomly while exposed to sunlight.


Please avoid exposing the monitor to direct sunlight or glare reflection as mentioned in the user guide as below.


dernières modifications: mai 2024

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