The so-called “proximity sensing device” is a non-contact type sensing device that does not touch to detect the proximity of the object. Can be divided into capacitive proximity sensor, inductive proximity sensor, Hall effect proximity sensor and light sensor. As for the light proximity sensing device we use the light source for the polymer light-emitting diode (PLED), this device is organic light-emitting diodes and organic light sensor (Photodiode) component characteristics of the application, by organic light two The polar body generates an optical signal that is reflected by the measured object and is received by the organic photodetector to determine the movement of the object by detecting the intensity of the photocurrent.
In particular, the use of (PLED) organic components to produce light proximity sensor, can reduce the production costs, and to achieve the characteristics of flexibility. Mainly for the light detector to receive objects reflected back to the optical signal, designed to active pixel sensing mode read circuit, the so-called active pixels are no need for external circuit with the direct read circuit and sensing device integrated layout On a single wafer.”