An apparatus and method for encoding and decoding additional information into a stream of digitized samples in an integral manner. A set of infrared, IR, or near infrared, NIR, light sources, is arranged such that an amount of the light emitted from the light source incidents on an eye of the driver or operator. Two sets of geared wheels are aligned and rotatably mounted to opposite sides of the drive shaft and the driven shaft. The active device disposed within the pixel region is electrically connected to the scan line and the data line.