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A stardard industry LCD display is composed of several parts. Polarizer film and color filters produce and image by masking the light from a source positioned behind the LCD itself, the so called backlight.

Many resin 3D printers today use an LCD display to actively mask an UV source, used as backlight, by selectively turning on / shutting off pixels. I read that the fact that a UV source is used compromises the lifetime of the display, since UV light slowly damages the display, shortning its life to circa 500 hours of operation

Normally the UV backlight used in 3D printing has a wavelength of 405 nm. Will it work with shorter wavelength? Proving of course that a resin which reacts to shorter wavelengths is available. I saw resins available for 385 nm, but what about using even shorter wavelengths?

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  • \$\begingroup\$ what is unclear? The LCD display is used as an active mask for 3D printing. A UV light source is used instead of standard LED backlight. The source normally has a wavelength of 405 nm. Will it work with shorter wavelengths? \$\endgroup\$
    – Francesco
    Commented Oct 22, 2020 at 18:37
  • \$\begingroup\$ "what is the bandwidth of the backlight that can be used" is it unclear maybe? \$\endgroup\$
    – Francesco
    Commented Oct 22, 2020 at 18:45
  • \$\begingroup\$ it asked that, now just modified the question to make it more readable \$\endgroup\$
    – Francesco
    Commented Oct 22, 2020 at 18:48
  • \$\begingroup\$ Absorption will increase as you lower wavelength, requiring higher power and further accelerating damage to the LCD. \$\endgroup\$
    – user1850479
    Commented Oct 22, 2020 at 18:59
  • \$\begingroup\$ I know this. But how big portion of the UV light will actually be transmitted? And how much will.be absorbed? \$\endgroup\$
    – Francesco
    Commented Oct 22, 2020 at 19:02

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