I'm an electrical engineer tinkering with a tiny display that has an LED back light. It looks like a little square and it quickly cycles through red, green, blue light to produce the final display. I wanted to do some experiments to improve the brightness so I first researched how to design LED backlights but then I thought maybe I can just make a tiny light projector? And that might be easier to put together on the bench myself.
I'm concerned about a few things. The LEDs will be physically close but can't all be at the center of the collimating lens. I don't want any hotpsots just a clean block of light like the original LED backlight which is why I thought of the diffuser. So maybe this is a bad idea? And of course I worry about all the things I don't know :)
Does this approach seem reasonable? Does the LED placement matter as much as I think it might? I'm thinking I can just look up collimating lenses at Edmunds but is there anything special I have to think about for the LED output pattern and lens combo?