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I have an arduino with mega 2560 and a 3.5" TFT LCD. I hardly try to find a code for it since I don't know how to write one. but all of the sources are written for arduino uno. can anyone give me a link please?

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First you need to know which chip the screen is based on. Then you need to know what interface it uses. Then you need to google for that library. The fact that you're on a mega is irrelevant. – Majenko Aug 17 at 12:06

Most alpha / numeric LCDs mounted on its own PCB...

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...use an Hitachi style LCD interface. Of which the Arduino library can be found here.

Color LCD screens...

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...(like in computer monitors) usually use an LVDS type of interface. These normally need highly specialized hardware to drive them. It is unlikely an Arduino can be made to drive these types of color LCDs.

There are highly specialized color LCD screens...

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...which are self contained computers able to talk to much less power processors such as an Arduino over a simple interface such as SPI. As these are highly specialized, your only resource as to how to use them is the specific manufacture. Also, it is unlikely you will be able to do much more then geometric shapes and still images with such devices.

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