You can run the tool online at: https://diegolrs.itch.io/lcd-pixel-simulator
Liquid crystal displays (LCDs) are comprised of tiny elements of color called pixels. Each pixel consist of three subpixels colored red (R) , green (G), and blue(B).
(RGB Color model representation)
All the colors displayed in a screen are combinations of differents amounts of R, G, and B values, like color space CMYK that are made with that following combination:
(CMYK Color model representation)
Ciano - RGB(0, 255, 255)
Magenta - RGB(255, 0, 255)
Yellow - RGB(255, 255, 0)
Key - RGB(0, 0, 0)