Abstract: Methods and structures of a three-dimensional memory device are disclosed. In an example, the disclosed method comprises forming a plurality of dielectric stacks stacked on one another over a substrate to create a multiple-stack staircase structure. Each one of the plurality of dielectric stacks comprises a plurality of dielectric pairs arranged along a direction perpendicular to a top surface of the substrate. The method further comprises forming a filling structure that surrounds the multiple-stack staircase structure, forming a semiconductor channel extending through the multiple-staircase structure, wherein the semiconductor channel comprises unaligned sidewall surfaces, and forming a supporting pillar extending through at least one of the multiple-staircase structure and the filling structure, wherein the supporting pillar comprises aligned sidewall surfaces.

Abstract: A self-powered portable electronic device includes a main body, a cover slidably assembled on the main body, a sliding part secured on the cover, and a power generating device. The power generating device includes a rack secured on the sliding part, a power generating module assembled on the main body, and a gear engaging the rack and assembled on the power generating module. The cover slides the rack relative to the main body, and the gear is rotated by the rack and drives the power generating module to generate operating power.

Abstract: An exemplary electronic device includes a lower housing having a mounting panel, a first camera module mounted to the mounting panel, a sliding member mounted to the lower housing, a second camera module mounted to the sliding member, and two hinge assemblies fixed to the sliding member. The first camera module is configured to be covered by the sliding member. The second camera module is configured to be covered by the mounting panel. The hinge assemblies are configured to make the sliding member slidable relative to the lower housing to expose the first camera module and the second camera module out from the sliding member and the mounting panel, respectively, and enable the sliding member rotatably relative to the lower housing.

Abstract: A self-powered portable electronic device includes a main body, a cover slidably assembled on the main body, a sliding part secured on the cover, and a power generating device. The power generating device includes a rack secured on the sliding part, a power generating module assembled on the main body, and a gear engaging the rack and assembled on the power generating module. The cover slides the rack relative to the main body, and the gear is rotated by the rack and drives the power generating module to generate operating power.

Abstract: An exemplary electronic device includes a lower housing having a mounting panel, a first camera module mounted to the mounting panel, a sliding member mounted to the lower housing, a second camera module mounted to the sliding member, and two hinge assemblies fixed to the sliding member. The first camera module is configured to be covered by the sliding member. The second camera module is configured to be covered by the mounting panel. The hinge assemblies are configured to make the sliding member slidable relative to the lower housing to expose the first camera module and the second camera module out from the sliding member and the mounting panel, respectively, and enable the sliding member rotatably relative to the lower housing.