There are several things wrong.
The 7447 CAN not work on 15 Volts, as it is TTL that is only allowed to work on 4.75 to 5.25 Volts.
Also there are no current limitting resistors for the display.
You think the display is not updated, but it is VERY fast updated (50 Hz), so fast you wont see it.
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by Jeff Child