**5.2 Passive/active sensor pixel**

The pixel circuit architecture of the sensor array can be either passive or active [17]. The passive pixel is depicted in **Figure 13** and is comprised by the photoelement, a capacitor, and a select TFT. The main difference of the active pixel is that it requires an extra TFT acting as a local amplifier. For high-resolution applications, the active pixel is not recommended, since its footprint is larger than the footprint of passive pixels.
