Re: Mixing LED colours...
Hi IanP,
Thanks for your reply.
I did an experiment with 0805 SMD LED's (not the smallest, but good enough) and although the colour mixed for 90% of the diffuser, there are indeed component colours around the edge.
Guess its RGB's after all. Although I used scrap plastic as a diffuser, which is only 'slightly' diffuse (cheap polypropelene).
So, I've decided to use the RGB's in an array (only 40x40mm) and to make it as thin as possible, what diffuser would I need? I opened up my LCD module, and looked at the backlight. Its a 16x2 character with 5x2 LED's. The diffuser film is very thin, and bendy white plastic, it looks completely opaque but lets light through and is an
excellent diffuser.
I've got 'some' plastics here and I've tested them, but their either not diffuse enough, or are too 'coarse' and do not make a smooth light. Tried:
CD case.
Safety goggles plastic.
Plastic milk bottle plastic
clear plastic with paper on one side/both sides.
White Baking paper - great diffuser, but doesn't let much light trough, and its rough.
Again, I cannot find any of these types of backlights for sale in the UK. Unless I buy another backlighted LCD, but that costs £££.
I'm pretty sure I could knock up a white plastic light box, with the LEDs glued in, but the diffuser is a problem. Some 'milky-white' plastic would be great.
Any *cheap* solutions would be very welcome. I'm completely stumped on this one.
BuriedCode.