The picture can be changed with a permanent magnet

 The picture can be changed with a permanent magnet. I have pairs of 3 color boxes, such as 3 screen colors, these boxes are enlarged to create large and small colored dots. then use a magnetic spiral screw behind each cell to screw the thread to create pressure to create large and small colored dots, then use the magnetic field to converge and set the suction to screw the magnet screw as 2 deflection magnets rotating suction.Use electromagnets to create a varying magnetic field to converge at all positions to adjust the threaded screw magnets into pictures. The different poles to suck 2 poles of the screwed magnet. so strong enough to screw the thread and also let the screws around the magnet not screw.

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