The as-fabricated encapsulated photodetectors at the neutral mechanical plane are supposed to perform stably during the bending process no matter how large the strain of the outside surface is. Meanwhile, they show an ultra-stable performance with almost unvaried photoresponse properties after 10 000 bending cycles or a bending duration of 1000 h with a radius of curvature of 5 mm. Furthermore, they can work as long-term stable rollable photodetectors.