What happens to 7-segment display when the value of input combination is greater than 9?

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Best Answer:

灶君: Possibly this (from wikipedia )
https://en.wikipedia.org/wiki/Seven-segm…

see more
https://en.wikipedia.org/wiki/Seven-segm…

But original 7 segments displays – YOU chose how to light each segment…
so the 0 – 9 and other combinations were sent to your decode circuit… and you chose how to display data.. even as far as going to all letters of the alphabet..

Other answer:

灶君:
If the display has a 4-bit binary input rather than a pin for each segment, It depends on how the display is programmed. Some of them might display hexadecimal characters.
Me2:
The ancient 744511, for example, blanks the display when values greater than 9dec (1001bin) are input.
Chris P:
It depends on the design of the specific controller;

some will display hexadecimal digits (A-F)
some will blank the display
some will show other symbols (for example '-')
others will show random patterns

Read the datasheet for the specific display and driver you're using.

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