A method for reducing bit-depth of image data for an imaging device includes receiving an image frame for display to the imaging device. The method also includes an act of forming a graphene layer or a graphene-like layer on the exposed substantially -surface. Based on the rotation of the dual-lobed image, the axial position of the molecule can be estimated or determined. Alternatively, photosensitive type polyimide may be patterned directly with the use of a lithographic mask. An outlet pipe is mounted in the control cap and has an end communicated with the reverse osmosis module. The FPC is folded at its connecting portion in such a manner that the first surface and the second surface are opposite to each other, whereby a capacitance element is formed between the capacitance element electrode and the displacement electrode.