They decided to get a 13″ LCD 4K monochrome display. 3840 x 2160 pixels – more than 8 Megapixels – and a density of 330 pixel/inch (1 pixel is 76 micron). There is no backlight, and it connects to a computer HDMI port through an adaptor board. It was bought from Duobond Displays Shenzhen.
The picture is displayed on the screen and the light shines through, exposing the photo paper.
I removed the dust from the projector, get the 3 chemicals and black and white paper. I spent a bit of time to make the cave lightproof, but after all it is not very complicated.
After the first test, I was happy to see that the LCD is perfectly able to block the light with black pixels and let enough light to pass through with white pixels. Making on the paper respectively white and black pixels.
Pixels are visible on both prints and are about the same size. However, the LCD leaves tiny vertical lines.
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