What is the legislative ruling on a person who reads from the noble mushaf for taraweeh prayer in Ramadhan, or the night prayer outside of Ramadhan or the eclipse prayer, whilst a person is standing for the prayer and he has the mushaf with him and he reads the long chapters, which he was not able to memorise?

And when he prostrates he places the mushaf on the ground or a table which is close to him and when he stands he takes the mushaf with his hand and recites, and he does this until he has finished his prayer?

Is this also allows in the obligatory prayers?

Benefit us, May Allah benefit you.