| CPC H04N 13/32 (2018.05) [H04N 13/354 (2018.05)] | 11 Claims |

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1. A display device, comprising:
a light source;
a grid structure, disposed above the light source and capable to move left and right relative to the light source; and
a photo interrupter;
wherein when the grid structure does not block the photo interrupter, the light source receives a first signal, and when the grid structure blocks the photo interrupter, the light source receives a second signal.
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