Patent ID: 9256089
Filing Date: 2016-02-09
CPC Classification: G02F,G06F

Claim Text:
1. A display device comprising: a backlight unit comprising at least a light sensor, a first light source modulated at a first frequency and associated with a first region of a display, a second light source modulated at a second frequency and associated with a second region of the display, and a third light source modulated at a third frequency and associated with a third region of the display; the display configured to receive light from the first light source, the second light source, and the third light source and to form an image for viewing by projecting the light from the first light source out of the first region of the display, projecting the light from the second light source out of the second region of the display, and projecting the light from the third light source out of the third region of the display; and the light sensor of the backlight unit configured to receive reflected light from the image formed by the display when an object is near the display and determine whether the reflected light originated from the first region, the second region, or the third region of the display by demodulating the reflected light and comparing a frequency of the reflected light to the first frequency, the second frequency, and the third frequency, the backlight unit configured to detect a position of the object relative to the display based on whether the reflected light originated from the first region, the second region, or the third region of the display, the third region of the display comprising a middle region of the display.