Light sensor on a surface of a light guide for use in displays

Abstract

A light guide for a display device is disposed as a light-collecting film in front of or behind a display device and which detects the ambient light and the light from an illumination device incident on the display device. The illumination device is controlled by means of a light sensor disposed on a lateral surface of the light-collecting film. Because the light sensor is disposed on a lateral surface of the light-collecting film, the sensor does not disturb the beam path of the light incident on the display device. The sensor output is used to control the illumination device, which produces uniform illumination of the display device, so that its brightness matches the ambient brightness, while taking into account, by means of a correction factor, the number of display elements which are connected in an optically transparent manner.

Dependencies are inferred from the claim text.