Electroluminescent display having a drive transistor controlled by a light sensitive device and a light blocking structure to prevent cross talk

An active matrix display device has pixels each with a light-sensitive device for optical feedback functions. Each pixel has a light blocking structure formed from the thin film layers of the display substrate in the proximity of the light-sensitive device and substantially at the level of an input surface of the light sensitive device. This structure prevents the passage of light (g) to the light sensitive device from a substantially lateral direction.