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PICList Thread
'Recommendations on LCD controller chips'
2010\07\21@015023 by Michael Wirth

picon face
Folks,

I'm putting together a DRO (Digital Read Out) display for a small
vertical mill that I have in my shop (a Clausing 8520).

The good news is that I have a Hitachi LM215B 480x128 monochrome LCD
panel in a ruggedized case that I got at a great price :-)

The bad news is that the recommended Hitachi LCD timing controller
chip, e.g., a HD61830, is obsolete and no longer available.

Solution?

1. Use an 18F PIC to generate the 1 MHz stream of 4-bit nibbles to
constantly refresh the display at 1/64 duty cycle -- timing is a bit
stressful for this chip.

2. Epson has an LCD controller part that looks like it will more than
suffice, the S1D13700, and is now available (Digikey, about $10)

Any recommendations for other LCD controllers for this primitive LCD
panel?  Requirements include:
a. on-chip frame buffer for at least 480x128x1
b. compatible with driving the LM215B (which requires four 1 MHz
single-bit streams for the four quadrants of the display, multiplexed
as a stream of 4-bit nibbles)
c. any scan converter functions in the controller, e.g., line
generation, text generation, shape generation, etc., are a plus
d. integration with open-source 2D graphics libraries for the PIC or
similar processors would be wonderful :-)

Comments? Recommendations?

TIA,

Mike
Palo Alto, CA

2010\07\21@053134 by Alan B Pearce

face picon face
> Solution?
>
> 1. Use an 18F PIC to generate the 1 MHz stream of 4-bit nibbles to
> constantly refresh the display at 1/64 duty cycle -- timing is a bit
> stressful for this chip.

Look at the new PIC24 Graphics chips? The PIC24FJxxxDAyyy series chips
have USB and a GPU designed for driving graphics displays. I haven't
looked closely at them, so don't know if they drive glass directly or
expect an intermediate controller.
--
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