How to increase brightness of projector

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Avijit Palit
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I have made a smartphone projector. But is has low brightness.
How to increase brightness of projector...
Help please
 
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The dimness is due to the amount of light the phone's screen produces being spread over a wider area.
You need a phone with a brighter screen, a smaller projection area, or a different means of projection: i.e. point a camera at the phone and project the camera image.
 
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Plz give a explanation...