Abstract: Images are presented to an observer using a controllable light delivery medium having a display region. The light delivery medium is controlled in such a way as to enable the observer to perceive any of more than one image based on the motion state of the observer's eye and without relying on any change in the operation of the controller or the medium as the basis for triggering the perception of the more than one image.

Abstract: A shaft angle transducer uses a rectangular prism to refract a light beam in proportion to the angular displacement of a shaft and then measures the refraction with a pair of light sensors. A fixed light source projects a light beam through a cylindrical lens and the prism to produce a patch of light on the fixed light sensors. An aperture shapes and sizes the light patch to nearly match the dimensions of one of the light sensors. The prism rotates with the shaft and refracts the light beam in proportion to the rotation angle. As the patch translates across the surface of the light sensors, more light impinges on one light sensor and correspondingly less light impinges on the other light sensor. The difference between the signals produced by the two light sensors produces an output signal that approximates the angular displacement of the shaft from a null position.

Abstract: Information in binary form is stored in a planar array or mosaic of light-polarizing cells, wherein each cell may have two distinct orientations of the axis of polarization. For example, binary "1" may be denoted by setting the axis of polarization in any cell to the vertical, and binary "0" by setting the axis to horizontal. Binary data so stored are invisible to the naked eye, but will become visible as a pattern of light and dark spots when viewed through a second polarizer. A unique property of light-polarizing mosaics is that when two such mosaics are laid one atop the other in precise registration, the resulting visible pattern of light and dark spots portrays the modulo-two sum (also known as the "exclusive or" product) of the two sets of binary information stored therein.

Abstract: A modulated array of lights for the creation of momentarily perceptible visual images when scanned asynchronously by the human eye during characteristic saccadic eye movements between points of eye fixation is described in the disclosure. The array and modulation style are chosen to provide an image that matches the span of the human eye/brain combination for recognition of tachistroscopically presented lines of text, other symbols, and pictoral images, and to achieve an illusory effect wherein the momentary image appears dissociated from the array of lights and appears superimposed on the scene of eye fixation just prior to initiating the saccadic movement. A preferred embodiment using light emitting diodes and large scale integrated logic circuitry is described for generation of words, phrases up to 32 characters long, and simple pictures.