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10283 results about "Lightness" patented technology

In colorimetry and color theory, lightness, also known as value or tone, is a representation of variation in the perception of a color or color space's brightness. It is one of the color appearance parameters of any color appearance model.

Apparatuses, methods, and computer programs for displaying information on vehicles

InactiveUS6850209B2Flexible and effective and profitable usageCathode-ray tube indicatorsOptical signallingInformation controlMobile vehicle
A system for publicly displaying messages includes elements carried by an automotive vehicle. In some embodiments the vehicle carries a publicly visible electronic display; a sensor for sensing the brightness of light in the vicinity of the display; and illumination varying circuitry for varying the brightness of light generated by the display in response to brightness detected by the sensor. In some embodiments the vehicles carries a publicly visible display formed by ganging together a plurality of displays, each having at least 640×480 pixels; and video drive circuitry for causing images to be shown on the ganged display with different portions of individual images being shown on each of the individual displays. In some embodiments the vehicle has an automotive electrical system and carries a publicly visible high-bright display, capable of providing over 1000 NITS illumination and having 640 by 480 or greater pixel resolution; and video drive circuitry causing images to be shown on the display. In some embodiments the vehicle carries a publicly visible electronic display and a computer. The computer has video drive circuitry for causing images to be shown on the display, a memory device capable of storing representations of animated display images represented in vector-based form; and programming for enabling the computer to generate animated images from the vector-based animation representations. In some embodiments the vehicle receives commands and/or information controlling what it is to display via a wireless transceiver.

Electronic apparatus with backlighting device

InactiveUS6891525B2Suppressing excessive power consumptionMaintaining necessary brightnessCordless telephonesPower managementOperation modeBrightness perception

Planar light source device having polarization separator formed of two sheets with mating triangular prisms and different indices of refraction

The purpose of the invention is to provide a light guide of a variety of forms having a uniform distribution of brightness in the plane and a planer light source device for a liquid crystal display device which uses such light guide. The light guide comprises a first surface which is a surface to which a natural polarization light is incident and a second surface other than the first surface which is an exit surface of a specific polarization light into which, said natural polarization light is modulated, wherein;said light guide has an interface of two materials of different indices of refraction oriented at an angle of thetaB+/-alpha degrees relative to the primary propagation direction of said incident light, said thetaB being an angle satisfying Brewster's condition, more than two orientations of said interface exist in a single light guide, and the difference between the indices of refraction of the two materials of different indices of refraction is between 0.001 and 1.0. thetaB is typically about 45 degrees. The light guide comprises a first transparent member having a plurality of upwardly convex right angle isosceles triangles on a first surface thereof and a first index of refraction and a second transparent member having a plurality of downwardly convex right angle isosceles triangles on a second surface thereof and a second index of refraction, and said first surface and said second surface contact each other.

Illumination systems utilizing highly reflective light emitting diodes and light recycling to enhance brightness

An illumination system that has an output luminance (brightness) LO that is greater than the intrinsic output luminance (brightness) LI of the light emitting diodes used within the system. The system utilizes one or more light emitting diodes having highly reflective surfaces and recycles a portion of the light generated by the light emitting diodes back to the light emitting diodes in order to enhance the effective luminance. The illumination system includes a light-reflecting cavity and one or more highly reflective light emitting diodes having total surface area AS mounted inside the cavity, either on the interior surfaces of the cavity or within the cavity volume. The cavity has a light output aperture of area AO. The light emitting diodes have reflectivity RS. The exposed inside surfaces of the light-reflecting cavity have reflectivity RC. In order to achieve enhanced brightness, it is required that the area of the light output aperture AO be less than the total area AS of the light emitting diodes. It is preferred that reflectivity RC and reflectivity RS each be at least 50%, more preferably 75% and most preferably 90%. Illumination systems with enhanced luminance resulting from light recycling may be used in projection displays, flat-panel displays, avionics displays, automotive lighting, residential lighting, commercial lighting and industrial lighting applications.
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