What type of 4-digit digital LED display module is this?

[daisizhou]

Hallo everyone

I found an interesting electronic tool on the Internet, please watch the video




I was lucky enough to find its schematic diagram, but when I read the circuit schematic diagram, I found that U7 is a display module, but it does not have a standard specific chip model.
It looks like a 4-digit digital tube integrated module. I have never seen such a module.
If anyone knows it please tell me, thanks

[PCB.Wiz]

Your title says 8 digit but your question is about 4 digit ? 
You may want to edit the title.

4 Digit LED modules are quite common in Asia, this link shows many choices for '4 places' from 0.26" to 0.8" with 0.56" the most common,

https://www.lcsc.com/products/LED-Segment-Displays_532.html

[daisizhou]

Thanks. I fixed the error.

Please see the picture, this is 4 LED display modules that can display 8-bit digital tubes.
But in the schematic diagram, please see U7, its pin definition is different from the common digital tube.
I don't know why this is

And I didn't find any LED module in the schematic diagram. It seems that U7 is an interface or display module integration, and U7 does not show the specific model.

[floobydust]

This is the closest I could find, but no part number. "Youngsun"
Or Lite-On LTC-4727 same pinout

[daisizhou]

Thanks .It really looks like