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The diagram shows the mirror system and the synchronized engine that displays light from the high speed video projector. Spinning mirror systems are used to build interactive 3D graphics and autostereoscopic visuals visible to multiple simultaneous viewers, since a different view can be perceived by each viewer depending on the angle of vision.
The Museum of Illusions refers to this type of mirror as an "antigravity mirror" because as it rotates once around the line-of-sight axis, the reflected image rotates twice, appearing upside-down when the joint is horizontal. Another type of non-reversing mirror can be made by making the mirror concave (curved inward like a bowl).
The technology goes back to 1973 with Harvey C. Nathanson's (inventor of MEMS c. 1965) use of millions of microscopically small moving mirrors to create a video display of the type now found in digital projectors. [1] The project at Texas Instrument's began as the deformable mirror device in 1977 using micromechanical analog light modulators.
Operated through a small lever, the mirror can direct the light at right angles into a viewing piece when actuated "up" or free the light from the telescope to pass into the CCD camera when it is flipped "down". [3] There are instances when a flip prism as an alternative to the flip mirror.
Flip-dot displays and LED display boards may be used instead of split-flap displays in most applications. Their output can be changed by reprogramming instead of replacement of physical parts but they suffer from lower readability. They also can refresh more quickly, as a split-flap display often must cycle through many states.
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A point-of-sale display (POS display) is a specialised form of sales promotion that is found near, on, or next to a checkout counter (the "point of sale"). They are intended to draw the customers' attention to products, which may be new products, or on special offer, and are also used to promote special events, e.g. seasonal or holiday-time sales.
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