You need a driver board to run it. SSD1963 based ones are popular and are often included on the screen, especially the 7" ones on eBay.
Arduinos cannot drive a display directly. Small TFT screens often include the driver chip on them in the form of a Chip On Glass (CoG). That can't be done with the larger screens due to the sheer amount of memory needed to store the frame buffer. So an external chip has to be used, or a microcontroller with built in TFT interface.
Majenko
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