Custom characters will be necessary for your situation, though.  Try to make a B
with only four lines:

####
####
#   #
####

You could use alternate characters:
####
#___#
#^^^#
####

But it doesn't look all that great.

Using custom characters allows you to make the middle of the B a bit better,
etc.  You can only have 8 user defined characters at once though.  The eight
custom characters SEETRON uses to create their big character displays are shown
in column 128 of the character code chart on page 6 of the following manual:
http://www.seetron.com/pdf/bpp423.pdf

These allow very crude, but readable, large characters on four line displays.

-Adam

Andre Abelian wrote:
>
> I think I can answer to me own question.
> creating big letters or any symbol is not thing to do with
> custom characters. let say we want to create a letter A.
>
> 00*00
> 0*0*0
> *****
> *000*
>
> this is 4 by whatever display all we need to do is to decide
> how wide are they going to be then  based on that we can put together
> with proper symbols that are available. Now in order to display a big letter
> A we need to create big letters and numbers and save them then
> when the command received to display big letters we need to compare each
> incoming
> letter and match it with proper letters and spacing. this is how I think it
> works
> I am going to try it.I know it is going to work but is this the only way of
> doing it?
> is there any better way?
>
> Andre Abelian
>
> > But I thought you could only have eight special characters.  If you
> > display some, then change them and display some more, does the
> > display keep the original ones or are they changed?  I have used
> > special characters for doing  bargraphs, but I only used seven I
> > think.
> >
>
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