General Method to Identify Pins?

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the subject says all.  i'm total noob way.  have several small displays don't know pin , hook what.  think if @ least knew how figure out each pin is, start.

this image pretty representative example of of displays like.

actually no. of them have 16 pins if backlight led on same connector or 14 pins 2 backlight led pens @ short end of right side. i'm not familiar 12 pin lcd displays. there pin numbers or other markings part number?
where did them ? did buy them on ebay ? have vendor link ?


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