Organic light emitting diode display having photodiodes

A display, comprising:

• an array of pixels including at least first and second pixels;
• a protective glass layer overlapping the array of pixels;
• a substrate on which the array of pixels is located;
• and
• a visible light sensor located behind the array of pixels and configured to detect ambient light that passes between the first and second pixels, wherein the array of pixels includes thin film transistors that are interposed between the protective glass layer and the visible light sensor.

A display, comprising:

• an array of pixels including at least first and second pixels;
• a layer of glass overlapping the array of pixels;
• and
• an ambient light sensor that is overlapped by the array of pixels, wherein array of pixels includes thin film transistors that are interposed between the layer of glass and the ambient light sensor and wherein the ambient light sensor is configured to detect light that passes between the first and second pixels.