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I have a LG mobile phone LCD (model:KG 285). How could I interface with this LCD with an AVR microcontroller? Also, why are there articles on websites showing only interfacing of Nokia LCD?

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How could I interface with this LCD with an AVR microcontroller?

Mobile phone manufacturers do not usually release information about the hardware they use. The first step would be looking if it has a controller on-board. Without a controller board you can't use the LCD, an Arduino can't handle being a controller. If it has a controller you have to update your post with pictures of the screen then we can help you a bit more.

Also, why are there articles on websites showing only interfacing of Nokia LCD?

Nokia LCD's are easy to interface with, they're cheap and really good quality that's why they're popular that means there are more websites showing how to use them. As a beginner it is a good idea to use popular things, people can then help more.

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How to interface this lcd with a avr microcontroller?

You can't.

Why there is articles on websites showing only interfacing of nokia lcd?

Because Nokia LCDs are simple to interface to a microcontroller. Colour CSTN screens (a form of TFT) are considerably harder to interface - they require a dedicated controller chip and lots of memory. The screen may have its own controller chip built in, or it may not. Since mobile phone companies seldom (if ever) release technical details on the components their devices use, it is almost impossible to know what the screen is or how you can work with it.

Also, why would you bother spending the time and effort to try (and probably fail) to get an unknown screen working with a low-powered MCU like the Atmel when you can get similar screens on eBay for like $5 which are known to work with the Arduino and there is even software available for it?

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    The why part is understandable, someone beginning with electronics does not always understand the complexity of certain tasks, finding a nice screen and wanting to use it is nothing special. Also, negative attitude towards someone who is interested in electronics is something I'd try to avoid. – Avamander Sep 2 '15 at 13:00

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