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Saturday, January 19, 2013

Hitachi LCD Driver Low res Monochrome, up and going again

Here's a very well written and detailed, how he did it. On getting an old Monochrome LCD up and going again....

Don

Low res monochrome Hitachi LCD driver

Hitachi HD61830 HD61200 FPGA

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4 replies to this topic

#1 alex

Posted 17 January 2013 - 11:52 PM

A friend of mine found a junked Hitachi LCD and gave it to me to see if I could get it going. The LCD is an older type, monochrome low resolution. I couldn't find a datasheet for it or pinouts so I went old school and tracked down datasheets for the chips on board and did some reverse engineering of the schematic using a continuity meter. A very good datasheet resource is the "Hitachi LCD Controller Driver LSI Data Book" which is a compendium of a large number of Hitachi LCD controller chips.

 
 
According to the datasheet, the large chips on board are six HD61200 column shifters (IC3,4,5 and IC 6,7,8) and two HD61203 row shifters (IC 1,2). The unpopulated footprint is is a little weird with some missing pin traces (the one trace gaps on the short edge of the chip) and one less pin on one side of the chip compared to the other side. This footprint matched exactly the footprint of the HD61830 controller chip. The last unpopulated footprint of IC12 should be a SRAM chip for the IC11 controller.
 
The LCD has one 20 pin set of connections that just go to the unpopulated IC11 controller chip. It also has a 10 pin edge connector that connects to the outputs of the IC11 controller and the inputs of the row/column shifters. It appears the PCB was designed to work in both a smart mode (with controller) and a dumb mode (no controller) hence the two different connector options.
 
Because the controller chip was missing, I realized immediately that this LCD could not be driven in a static mode, where you just write data to the LCD internal memory and you can leave it alone to display that data. Instead this LCD would be more like a VGA display where you must constantly send data to it to refresh the picture.

Read More...
http://forum.gadgetfactory.net/index.php?/topic/1502-low-res-monochrome-hitachi-lcd-driver/


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