Abstract: A fabrication method of a selective emitter solar cell, including: forming a selective emitter solar cell base having a buried grid electrode; forming an anti-reflection layer on the emitter surface of the solar cell base; forming a bus-bar on the anti-reflection layer; and connecting the buried grid electrode with the bus-bar in the traversing direction underneath through the anti-reflection layer. Accordingly, the invention provides a selective emitter solar cell. With the method of the invention, emitters and bus-bars are made separately, the width of the emitters can be reduced according to actual needs, the area that is unnecessarily taken may be reduced, the effective area for a solar cell panel to receive sunlight may be increased. The invention improves conversion efficiency of a selective emitter solar cell panel from 16.5% to 18% or more.

Abstract: The present invention concerns an optic projecting technique for a projecting system comprising a housing and a projector unit, the projecting system comprises a housing and a projector unit, wherein the housing is provided with a display screen and a plurality of optic elements in the housing; the system is characterized in that: the projector unit is placed on the back of the housing in favor of detachment and displacement; when the projector unit projects optic images into the housing, the images from the projector are reflected by the optic elements and projected to the rear side of the display screen; when the projector unit is placed outside of the housing, it directly projects the optic images to the display screen at a suitable distance away, thus a dual projecting system for rear projection and front projection can be is formed.