Patent ID: 8478346

Claim:
A mobile phone comprising: a plurality of optical sensors; a plurality of display elements; a pixel circuit portion where a plurality of pixels and a plurality of transistors are arranged, wherein each of the plurality of pixels includes one of the plurality of optical sensors and one of the plurality of display elements; an optical sensor control circuit connected to an optical sensor driver circuit, wherein the optical sensor driver circuit is configured to drive the plurality of optical sensors and read a signal from each of the plurality of optical sensors; a display portion control circuit connected to a display element driver circuit, wherein the display element driver circuit is configured to drive the plurality of display elements; a gradient detection portion which is configured to output a signal in accordance with a gradient of the mobile phone from a viewpoint; and an arithmetic circuit which is configured to perform a display in the pixel circuit portion by switching an image signal output to the display portion control circuit with the signal from the gradient detection portion.