Patent ID: 9547389
Date: 2017-01-17
CPC Classifications: G02F,G06F

Claim:
1. A position detecting system, comprising: a display panel including a plurality of pixels; a backlight unit including a first light emitting unit and a second light emitting unit; a data driving unit configured to apply a first data voltage and a second data voltage to the plurality of pixels of the display panel, wherein the display panel is configured to display an image based on the first data voltage during a first frame and the display panel is further configured to display patterns based on the second data voltage during a second frame; and a position detecting sensor configured to capture an image of the patterns displayed by the display panel during the second frame, wherein the first light emitting unit is turned on and the second light emitting unit is turned off during the first frame, and the image is displayed on the display panel during the first frame using the first light emitting unit, wherein the second light emitting unit is configured to supply either visible light or invisible light to the display panel, and wherein the first light emitting unit is turned off and the second light emitting unit is turned on during the second frame, and the patterns are displayed on the display panel during the second frame by changing grays of the plurality of pixels using only the visible light or the invisible light of the second light emitting unit.