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 [ 2 posts ] 
 Adding a backlight to an LCD 
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Joined: Sat Aug 03, 2013 11:02 pm
Posts: 43
can i do that if it doesnt have one
http://www.jameco.com/webapp/wcs/stores ... _618003_-1

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Wed Nov 13, 2013 1:00 pm

Joined: Tue Dec 11, 2012 8:03 am
Posts: 282
Location: California
If they don't come with one, they usually don't have room between the PCB and the glass to put one. There's no gap to slide one in. If they do have a backlight though, they are not reflective but instead transflective, and they don't do well without the backlight. The backlight takes quite a bit of current, so if you want a low-power set-up to make batteries last a long time, you probably don't want a backlight.

Note the selection guide on page 2 of the data sheet link at that page. The reflective type cannot be backlit; but as long as you have decent ambient light, you don't need backlighting. These intelligent character LCDs are driven with a much better duty cycle than what you might have seen on a graphing calculator for example. The contrast on these is much better than the graphing calculator, and in fact the supertwist one you referenced with the dark blue letters on a background that's silver with a slight light-green shade to it is a beautiful-looking display. I was fooling around with a half-dozen different sizes and brands of intelligent character LCDs last week for a work project, and was impressed again by what a nice display that is, definitely nicer than the one on my workbench computer in the first two pictures at http://wilsonminesco.com/6502primer/displays.html.

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Wed Nov 13, 2013 8:34 pm WWW
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