A display is disclosed that comprises an array of display pixels, in which light sensing pixels are interspersed with the display pixels substantially across the area of the display. At least one color display sub-pixel is arranged to be switched off when the corresponding color light sensor pixel closest to that display sub-pixel is detecting light to generate an image. A portable electronic device is disclosed which comprises the display. The display is then operable to capture an image from the light sensing pixels, so that for example it can then operate as one or more of a digital mirror, scanner, biometric lock or touch panel. When a user looks at the display for a video call, the captured image of the user appears to look directly the other party.