| 摘要 |
Display apparatus including an annular frame defining a central region, at least one set of indications arranged on the frame around the central region, at least one projection arranged proximate, in correspondence with or in alignment with one set of indications, and a rotation mechanism coupled to a connection point on each projection to rotate the projection such that the connection point is rotated in a loop around the central region. The rotation mechanism determines a quantity to be displayed and control rotation of the projection(s) based thereon. The projections can extend inward from rotatable rings (and not outward from a common, central point or area) so that the central region defined by the frame may be open. When multiple rings are used in connection with the same set of indications, the projections on the rings are different in form, size, color and/or shape.
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