The display was used in a weight scale.
What does each pin means? Where I need to connect it on my Arduino Uno? How do I display text on it (code)?
Why do you want to know? 
Paul__B:
Why do you want to know?
Because of:
Where I need to connect it on my Arduino Uno? How do I display text on it (code)?
One of those scale taken apart hobbyists.
Yes, I gathered that. 
Why it has anything to do with Arduino, is another matter entirely.
You can do incredible things with Arduinos, might even produce some output on such a device, if you know enough about this "thing". 
Paul__B:
Why do you want to know?
Because I want to display stuff on it, and I have no idea what every pin means, besides the GND and +5v, and there is no information about this lcd display in the internet.
the LCD has too many pins compared to the connector cable at the left side.
Most likely there is a driver chip on the board, either on the back side or under the LCD.
The LCD could be of matrix kind or segmented. There might be a model number on the backside of the LCD.
Unless someone has seen the exact same LCD, nobody can help you with so little information.
Most likely meanings of the connector pins:
K3, K1 buttons
+9, : supply pin for the LCD
W : write/read signal
CS : chip select
DA : serial data of some kind
..
TI : touch interrupt? maybe for the buttons, or maybe some clock input
not of great help, isn't it?
Unfortunately, the driver chip will be a COB - a large black splodge on the board with no descriptive information whatsoever.
And the display is not a matrix, it has a number of fields, not all of which will be numeric but most likely fixed various text "annunciators". It would be useful to see it operating in the original unit.
Did it actually run from 9 V? Is that a "9" or a partially concealed "S"?
"TI" may be the trigger to turn the unit on. Maybe not as this board is only half of the electronics.
I doubt it will get anywhere at all, but yuvix should show the other part.
Yes I do needed to add more info (which I did now), but I don't have much of it.
Hope it helps
I suggest you search for "segment lcd" on AliExpress, ebay, amazon...
These displays are cheap in general, so its not worth searching for info on a device retrieved from whatever equipment, with hidden controller.
But for hobby use, a matrix lcd might be more interesting.
I don't really need a display, just wanted to learn how to work with them...