Densitron has introduced a series of multi-touch PCTs (projected capacitive touchscreens) that require a very slight touch to function. The PCTs detect multiple stimuli and up to 10 simultaneous touch inputs. They also enable gestures such as zooming in, zooming out and rotation. They are manufactured using an all-glass construction and are less likely to suffer from the Newton rings phenomenon, claims the company. The multi-touch sensors operate between -20 and 70°C, and are compatible with the company's TFT displays. Complete display and touch modules are produced by using the optical bonding technology. This technique affixes a touch sensor directly onto a flat panel display to eliminate the air gap present in between and to reduce reflectance to 0.2%. This increases the contrast ratio significantly, and enables sunlight readability without backlight modification. The optical bonding process also enables the display modules to be ruggedised. To address electrical interference between a display bezel and the edge of a capacitive sensor, the company offers controllers that tune SW parameters to optimise sensor, controller and display combination. The controllers provide touch input data in I2C or USB format.
