I don't know which generation of your flat panel is, because you didn't say the model of your Apple flat panel, so I'll quote you the prices of all screens in these generations. The current price is as follows:
IPAD generation: external screen: original product1around 40 yuan, and assembled product around 80 yuan.
Interior screen: 250 yuan or so.
The second generation of IPAD: external screen: original product 120 yuan or so, and assembled product/70 yuan or so.
Interior screen: 250 yuan or so.
The third generation IPAD: external screen: original product 120 yuan or so, and assembled product/70 yuan or so.
Interior screen: 250 yuan or so.
The fourth generation IPAD: external screen: original product 120 yuan or so, and assembled product/70 yuan or so.
Interior screen: 250 yuan or so.
The fifth generation IPAD: external screen: the original product is about 180 yuan, and the assembled product is about 140 yuan.
Internal screen: 400+ yuan
Finally, if the screen of your tablet computer is not damaged by external force and the color of the screen is abnormal, it may be that the motherboard is out of order and needs to be checked and confirmed by a professional maintenance department.