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Topic: Sparkfun LCD, ok without backlight, or in sunlight? (Read 3 times) previous topic - next topic

Loudhvx

Hi all,
I have the Sparkfun 16x2 white-on-black LCD and it works ok, but must always use the backlight. It's also no great on sunny days.

I'm looking for a purely reflective type LCD, or at least one that will work great in sunlight. It would be nice to save on battery power by not using a backlight.

My question are: Does the Sparkfun black-on-green, 16x2, LCD work more like a reflective type (more than the white-on-black one)?  Can I use it with no backlight?  And is it easily readable in bright sunlight?

Or does anyone know of a good, reflective LCD display that is serial-enabled for Arduino?

Thanks in advance.

dhenry

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Can I use it with no backlight?  And is it easily readable in bright sunlight?


You can experiment since you already have one. Generally, the positive types (lights going through the pixels, like white-on-blue) don't work without backlight. The negatives (reflective. lights got blocked by the pixels) work without backlight.

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Or does anyone know of a good, reflective LCD display that is serial-enabled for Arduino?


Parralex (?) has them. and I am sure New Heaven has them too. However, they are generally quite expensive and it makes more sense (and more fun) to program an avr that functions like a serializer.


Loudhvx


Quote
Can I use it with no backlight?  And is it easily readable in bright sunlight?


You can experiment since you already have one. Generally, the positive types (lights going through the pixels, like white-on-blue) don't work without backlight. The negatives (reflective. lights got blocked by the pixels) work without backlight.


I don't have the black-on-green.  I only have the white-on-black, which is basically not readable at all without backlight.  I am asking if the black-on-green will work with little to no backlight.  From what you are saying, it will, thanks.


Quote
Or does anyone know of a good, reflective LCD display that is serial-enabled for Arduino?


Parralex (?) has them. and I am sure New Heaven has them too. However, they are generally quite expensive and it makes more sense (and more fun) to program an avr that functions like a serializer.


The ones at parallax look to be very similar to the Sparkfun models, and basically about the same price.

The ones at New Haven also look similar, and maybe slightly cheaper. However, it looks like they are mostly (if not all) RS232 as opposed to TTL. I assume they can run on TTL signal voltages (in RS232 data format). I have an RS232 output algorithm for VFD's, but it would be nice to simply plug and play using the serial library for fast/dirty projects, without re-inventing the wheel. 

Does anyone know whether one brand or the other works better with no backlight and/or in direct sunlight?

liudr

I don't know if your white-on-black is similar to my white-on-blue but for my case, I had to keep back light on all the time indoors. But if I turned off the back light, I can see outdoors. I had to readjust the contrast a bit though.

Loudhvx


I don't know if your white-on-black is similar to my white-on-blue but for my case, I had to keep back light on all the time indoors. But if I turned off the back light, I can see outdoors. I had to readjust the contrast a bit though.
Thanks. I haven't messed with the contrast outdoors with the backlight off. I'll give that a try.



Also, a friend of mine said he flipped the polarizing screen on some LCD's to get the negative LCD image. Has anyone tried that on these LCD displays?  Will it turn my white-on-black into a black-on-white LCD?  It looks like it will come apart easily with a few metal tabs.

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