A matrix array display device has an array of pixels on a substrate which each have a display element, such as an electroluminescent display element. An associated control circuit including a storage capacitor and a light sensing element are connected thereto for regulating charge stored on the capacitor...http://www.google.de/patents/US6738031?utm_source=gb-gplus-sharePatent US6738031 - Matrix array display devices with light sensing elements and associated storage capacitors
