128x64 LCD module
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Author:  Yin-Yang [ Sun Aug 07, 2005 14:52 ]
Post subject:  128x64 LCD module


I am a terribly newbie here. I am here to learn graphic LCD as part of my hobby. Recently I have bought the 128x64 LCD module and I have tried to use one today. I understood that a datasheet states that a typical 4.5 voltage should be applied to the LCD module. So I test it in order to see it works by applying ground and 4.5V to Vss and Vdd respecively. Unfortunately I could not see anything from the 128x64 LCD display. I use KS0108 driver.

Have I missed out anything or need to add extra components in order to make it work?

Can you please kindly advise me how to bring my 128x64 LCD module alive?


Author:  Yin-Yang [ Sun Aug 07, 2005 15:02 ]
Post subject: 

Here is a datasheet -

I don't fully understood with electronic stuff atm as I am quite new in electronic and microcontroller.


Author:  Yin-Yang [ Sun Aug 07, 2005 16:13 ]
Post subject: 

So far I have done:

Vdd = 5V
Vss = 0V

Vee = ??

Vo = ?? (Should I connect to with a variable resistor 10k??)

DB0-DB7 - connect to uC chip's port
R/W - connect to uC chip's port
D/I - connect to uC chip's port
E - connect to uC chip's port
CS1 and CS2 - connect to uC chip's port
RES - connect to uC chip's port
A - connect 8ohm resistor
K - connect to ground

I am still not sure about Vee and Vo.

Yin Yang

Author:  vitovitez [ Mon Aug 08, 2005 11:25 ]
Post subject: 

I have some problems reading the datasheet (something about chinese character). But... Vee must be the voltage needed for contrast, and must be variable between Vdd-19 and Vdd+0,3. I think you need some negative voltage supply.

Author:  One~Zero [ Sun Sep 04, 2005 12:22 ]
Post subject: 

Your -VEE is the voltage needed to drive the LCD, and the VO is your contrast adjustment. According to your data sheet, you should have about -13.5vdc (specs say between -8 to -19) for your -VEE. You would connect your potentiometer for your contrast so that one pin goes to -VEE, center pin to VO, other pin to VDD.

Author:  jacab45 [ Tue Feb 12, 2008 11:40 ]
Post subject:  Re:

Hey, have you ever tried ? It is a free Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes, triacs, and other semiconductors.
Hope you will get what you want.
Good luck!

Author:  Barbara58 [ Tue Jan 03, 2012 8:02 ]
Post subject:  Re: 128x64 LCD module


I have been learning to use 128x64 LCD module with AT89C51 and I have been using FastLCD for converting bmp into a table of bytes.

I have use the table in my codes and tried to compile it. I get the result - auto segment too large.

How to put all bytes in my codes in order to display picture on my 128x64 LCD module.

I don't understand it. What is the problem?

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