The screen of the 9.7" LCD connected to the M1 Mac Mini looks vertically stretched.

I've been using a 9.7" LCD panel with M1 Mac Mini since recently. However, the display ratio is not normal. That is, it stretches in the vertical direction. For example, a circle shape looks like an ellipse in the vertical direction. The phenomenon is the same even when the resolution is changed variously.

However, I had previously used an Intel Mac Mini (2014) with the same 9.7" LCD panel, and there was no problem.

Has the control information of the display driver changed since Intel changed to M1?

The LCD control board information of the 9.7" LCD Panel I am using is as follows.

Driver board kit : LTN097XL01 (China)

If you know a solution, please help me.

thank you