Patent ID: 7429726

Claim:
A system for displaying and capturing images, comprising: a display unit providing a first light according to a scan signal and a data signal, wherein the data signal is transmitted to the display unit through a data line; and a detection module capturing a second light and comprising: a photo detection unit detecting intensity of the second light; a transformation unit coupled to the photo detection unit at a first point and transforming the light intensity into a voltage signal, wherein the transformation unit comprises: a P-type transistor comprising a gate couple to the first point, a source receiving the high voltage level, and a drain outputting the voltage signal; and an N-type transistor comprising a gate coupled to the first point, a source receiving the low voltage level, and a drain coupled to the drain of the P-type transistor; and a switch unit comprising a transistor which comprises a gate receiving a selection signal, a source outputting the voltage signal through the data line according to the selection signal, and a drain coupled to the drain of the P-type transistor.