Waveshare TouchDisplay doesn't work with the LP

Today i bought my first Lp and i am verry happy with it but it wont work with my Waveshare 10“ TouchDisplay. The Display just shows „No Signa“ and then turns into sleepmode. I have tried with an other monitore and with this one it worked. The problem ist that i want to use it with the TouchDisplay.

I hope someone can help me thx.