How-to-DIY-a-Flat-Screen-Projector

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SUMMARY

This discussion focuses on creating a DIY flat-screen projector using an LCD screen from a flat panel monitor, a Fresnel lens, translucent fine grain paper, and an LED light source. The setup aims for rear projection, where the image is projected from underneath the paper. Key advice includes placing the Fresnel lens between the LCD and the paper to ensure the image is focused correctly, rather than the light source. Understanding the focal distance of the Fresnel lens is crucial for achieving a clear image.

PREREQUISITES
  • Understanding of LCD screen operation and image projection
  • Knowledge of Fresnel lens properties and focal distance
  • Familiarity with LED light source specifications
  • Basic skills in assembling optical components
NEXT STEPS
  • Research the specific focal distances of various Fresnel lenses
  • Learn about the optimal positioning of LCD screens for projection
  • Explore different types of LED light sources suitable for projection
  • Investigate additional materials for enhancing image clarity on translucent surfaces
USEFUL FOR

This discussion is beneficial for DIY enthusiasts, hobbyists in optics, and individuals interested in low-cost projection solutions for home or educational purposes.

jearl
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Hi,
I'm trying to create a projection on a flat surface by using an LCD screen extracted from a flat panel monitor, a sheet of translucent fine grain paper, a Fresnel lens and an LED light source. The purpose is to project a focused image on the paper for display proposes.

The idea is to have the image projected from underneath the paper or rear projection. I'm wondering if anyone here would know if the light from the source passing through a Fresnel lens then through the LCD will produce a clear image on the paper. At first I thought that this might fall in the category of lens effects but I'm not sure. I've attached a descriptive image of the proposed set up.

I know this may seem impractical but, this setup would keep my cost down for the project.

Thank you for your help.
 

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Science news on Phys.org
You probably want to put the Fresnel lens between the LCD and the paper. You don't want to focus the light source, but the image of the LCD. If you know the focal distance of the lens, you can easily figure out what distances you need.
 

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