Thanks for each reply. I got this lcd from one of my friends. He told me that he couldn't use the device and If I can find an info about it I wanna use this graphic lcd. I can use character type lcd devices but I have never used a graphic lcd before. So I wanna learn something about it.

By the way, I found some info about a similar lcd (DG-12864-11) which uses the same controller.(www.datavision.com.tw)And it has also same number of connection pin. but I am not sure whether pin definitions are same or not. What do you think?

'http://www.datavision.com.tw/english/index.html' /products/LCM-DG/DG12864-11

DG-12864-11 
。128 x 64dots 
。 STN Reflective/EL/LED Backlight 
。 1/64 Duty,	 

　
MECHANICAL DATA
Item	Dimension	Unit
Module Size	78.0(W) x 70.0(H) x 10.5(T)	mm
View Area	62.0(W) x 44.0(H)	mm
Dot Size 	0.4 x 0.56 	mm
Dot Pitch	0.44 x 0.6	mm

ABSOLUTELY MAXIMUM RATINGS
Item	Symbol	Standard Value	Unit
		Min	Typ.	Max.	
Supply Voltage for Logic	VDD- VSS 	0	--	7.0	V
Supply Voltage for LCD Drive	VDD- VEE	0	--	10.0	V
Input Voltage	VI	VSS	--	VDD	V

PIN FUNCTIONS
Pin No.	Symbol	Level	Function
1	/CSA	--	Clip Selection 
2	/CSB	--	Clip Selection 
3	Vss	--	GND
4	VDD	--	Power Supply For Logic
5	Vo	--	Power Supply For LCD Drive
6	D/I	H/L	H :DATA Input L:Instruction Code Input 
7	R/W	H/L	H:Data Read L:Data Write
8	E	H,H-L	Enable Signal
9~16	DB0~DB7	H/L	Data Bus Line
17	RST	L	Reset
18	VEE	--	Negative Voltage Output(-5V)
19	NC	--	No Connection
20	NC	--	No Connection