[chbot] Blue HD44780 LCDs

[Andrew Errington]

Here are my suggestions:

Perhaps you have an "inverted" display?  Coloured dots on a black
background?

Blue light tends to be perceived darker than other light.

Your LCD contrast setting is too dark.

HTH,

Andrew

On Sunday, 9 August 2015, Robin Gilks <robin at gilks.org> wrote:

> Greetings all
>
> I've only ever used green and yellow HD44780 style character mode LCDs and
> they have had a backlight (which draws a LOT of current) but been
> perfectly readable without the backlight being on.
>
> I'm now playing with a blue one and the backlight has to be on to read it
> - is this normal for blue LCDs ?
>
> I haven't checked the current yet (rebuilding alpha hardware into beta
> stage prototype) but I'm guessing its quite low since modern blue LEDs
> seem to be very efficient.
>
> Cheers
>
> --
> Robin Gilks
>
>
>
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