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I have seen cases where TFT module contains flash or SD card on module. What is the need of flash in LCD?

In simplest way, we connect RS,RD/WR,CS,RESET pins and 7/8/16/24 bits data pins of controller to LCD. So, why this memory provision is there on board.

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Images take up a lot of space. Putting them in some kind of external storage allows you to use a system controller with less program memory since you're not wasting this valuable space on images. Additionally, the images can be easily changed without any need to recompile.

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    \$\begingroup\$ In addition, such displays typically have their own microcontroller on board with graphics code burned into flash. This simplifies the coding on your processor. If you want to draw a circle, you would send a command with the center, radius, color, etc. instead of having to compute which pixels make up the circle and set them directly. \$\endgroup\$ – DoxyLover Jun 9 '15 at 18:11

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