--===============0030825582== Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by pch.mit.edu id mA73tVS5028009 =20 Hi: =20 Sorry for posting similar stupid questions on LCD display. =20 I also found Adam's 3 digit direct display program online before. It w= as pretty good. =20 My application will require a LCD about 2 by 1 inch. The Lumex and Var= itronix 3 digits' LCDs are a little too small. Thus I prefer to go with a= 3.5 or 4 digit LCD and block some areas by graphic overlays. =20 I noticed Jinx used a 4 digit LCD. This LCD has two commons and Jinx t= ied them together and it works. However, Adam said for 2 to 4 commons, us= ually multiplexing is required (if I understand it right)=20 =20 http://www.ubasics.com/driving_static_lcds =20 I am a little confused. Can I use a similar program Adam wrote to run = 3 digits on a 4 digit LCD?=20 =20 Another question is: Since these LCD does not have backlight. I did so= me research and thought that I can use a transflective LCD with some litt= le surface mount LEDs at the back of the LCD as backlight. These LEDs sho= uld have a very wide viewing angle, very small lumen. Correct me if I'm w= rong. =20 =20 =20 =20 =20 =20 =20 > Date: Thu, 6 Nov 2008 12:08:35 -0500> From: stienman@gmail.com> To: pic= list@mit.edu> Subject: Re: [PIC] Some questions regarding LCD display> > = I have two articles on driving static LCDs you might find useful:> > The = first drives a 3 digit display directly with a PIC:> http://www.ubasics.c= om/driving_static_lcds> Very low power, very low cost. Includes source co= de near the end.> Goes through what a static and multiplexed display is a= nd the driving> methods for a static display. You should only need a stat= ic display> for 3-4 digits.> > The second article is Jinx's solutions:> h= ttp://www.ubasics.com/Jinxs_static_LCD_drive_solution> Only schematics. O= ne uses an LCD driver IC (another common part> ICM7211, but not the AY pa= rt you mention). The other drives the LCD> with a few 74 series logic dev= ices run from the PIC. You might email> Jinx directly (he's on this list)= to see if he can contribute code for> either of these solutions.> > Good= luck!> > -Adam> > 2008/11/6 gardenyu :> >> > Hi> >> > I'm building a 3 digit LCD displ= ay trying to use a Microchip's AY0438 controller. I read the C18 compiler= library and found there are some pretty good library functions for Hitac= hi HD44780 LCD controller. This is weird to me. Why do they write library= functions for a driver which is not even their own product? I also notic= ed there are a lot samples everywhere for driving the Hitachi chip, and v= ery few on AY0438 driver. It turns out for a starter, it is much easier t= o use a much more expensive chip (80 pin for Hitachi) to realize a very s= imple function.> >> > I bet the difference is that the Hitachi chip suppo= rts many more characters, and people think it's "too easy" to drive AY043= 8, thus they don't bother.> > I'm very interested in getting a sample cod= e written using C18 compiler about driving just a few digits LCD using an= y control chip, if someone may share it. Thanks a lot.> > _______________= _________________________________________ _________> > =D0=C2=B0=E6=CA=D6=BB=FAMSN=A3=AC=D0=C2=B9=A6=C4=DC=A3=AC=D0= =C2=CC=E5=D1=E9=A3=A1=C2=FA=D7=E3=C4=FA=B5=C4=B6=E0=B2=CA=D0=E8=C7=F3=A3=A1= > > http://mobile.msn.com.cn> > --> > http://www.piclist.com PIC/SX FAQ &= list archive> > View/change your membership options at> > http://mailman= .mit.edu/mailman/listinfo/piclist> >> >> > > > -- > Please rate and vote = for my contest entry:> http://mypic32.com/web/guest/profiles?profileID=3D= 50331>=20 _________________________________________________________________ MSN =D6=D0=CE=C4=CD=F8=A3=AC=D7=EE=D0=C2=CA=B1=C9=D0=C9=FA=BB=EE=D7=CA=D1= =B6=A3=AC=B0=D7=C1=EC=BE=DB=BC=AF=C3=C5=BB=A7=A1=A3 http://cn.msn.com --===============0030825582== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: 7bit -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --===============0030825582==--