Abstract:
A resonant microcavity display (20) having microcavity with a substrate (25), a phosphor active region (50) and front and rear reflectors (30 and 60). The front and rear reflectors may be spaced to create either a standing or treaveling eledtromagnetic wave to enhance the efificenty of the light transmission.
Abstract:
A high intensity lamp is provided based on an open discharge between a cathode grid anode and a collector. A phosphor layer on the collector is excited by an electron beam to produce light or ultraviolet radiation to produce light.
Abstract:
A field emission cathode for use in flat panel displays comprises a layer of conductive material and a layer of amorphic diamond film, functioning as a low effective work-function material, deposited over the conductive material to form emission sites. The emission sites each contain at least two sub-regions having differing electron affinities. The cathode may be used to form a computer screen or a fluorescent light source.
Abstract:
A flat panel display of a field emission type having a triode (three terminal) structure and useful as a device for displaying visual information is disclosed. The display includes a plurality of corresponding light-emitting anodes and field-emission cathodes, each of the anodes emitting light in response to emission from each of the corresponding cathodes, each of the cathodes including a layer of low work function material having a relatively flat emission surface which includes a plurality of distributed localized electron emission sites and a grid assembly positioned between the corresponding anodes and cathodes to thereby control emission levels to the anodes from the corresponding cathodes. In the preferred embodiment of the invention, the layer of low work function material is amorphic diamond film. The grid assembly includes a conductive layer deposited between the plurality of anodes and cathodes and over interstices between the cathodes, the conductive layer having apertures therein, the cathodes aligned with, and of the same size as, the apertures.
Abstract:
A xerographic printing system is constructed using a field emission device 120 as a modulated light source. Alternatively, a lens 122 may be disposed between the field emission device 120 and the photoreceptor drum surface 106. The field emission device 120 may project a single pixel row, or may project multiple pixel rows which provide gray scale capability. The field emission device 120 may also provide color print capability.
Abstract:
A lighting device emits light by releasing electrons to an anode from a Joule-heated cathode and causes the electrons to collide against a phosphor on the anode side. A method of driving the lighting device repeats, at a predetermined lighting cycle, a heating period (t.sub.h) in which the cathode is heated by conduction, a lighting period (t.sub.on) in which the cathode is caused only to release electrons without conduction so that light is emitted, and a dummy period (t.sub.d) in which no conduction or emission of light occurs at the cathode. To variably adjust the lighting period (t.sub.on), adjustments are absorbed by the dummy period (td) to maintain the heating period (t.sub.h) constant at all times. With respect to the timing control of each period, the lighting period (t.sub.on) is controlled at a timing independent of the heating period (t.sub.h), whereas the heating period (t.sub.h) is controlled at a timing dependent on the lighting period (t.sub.on). This is preferred to facilitate the timing control of the lighting period (t.sub.on).
Abstract:
A voltage is selectively applied between two electrodes (emitter and gate) disposed at a short distance to create an intense electric field between the electrodes. Electrons emitted by the field emission are accelerated by the intense electric field and collide against a fluorescent layer so that light can be emitted from portions of the fluorescent layer. With a recording head of the above construction, an electrostatic latent image is formed on a photosensitive drum.
Abstract:
A display having as a light source thereof an electron tube. The electron tube has disposed in an evacuated envelope thereof a plurality of cathode means, each one thereof adapted to emit electrons in response to a control signal. A plurality of sets of at least one cathodoluminescent stripe is disposed within the envelope. Each one of said sets is associated with a corresponding one of the cathode means and adapted to emit light with a predetermined one of a set of primary colors in response to electrons emitted by the corresponding cathode means striking such stripe. An anode for collecting electrons emitted by said cathode is also disposed within the evacuated envelope.
Abstract:
In a cathode ray tube for a light source, a fluorescent surface adapted to emit light having one of three colors, red, green and blue is formed on the inner surface of a face plate which is provided at one end of a vacuum envelope, and an electron gun is disposed at the opposite end of the vacuum envelope in such a manner as to confront the fluorescent surface, at least the face plate being made of a glass material containing rare earth oxides Nd.sub.2 O.sub.3 and Pr.sub.2 O.sub.3, so that satisfactory color light and contrast are obtained even under the sun light.
Abstract:
A fluorescent signal level indicator includes two parallel rows of anode electrodes coated with a layer of fluorescent material to emit light when energized in response to an input analog signal exceeding a corresponding one of graduated reference potentials. A cathode electrode is provided for emitting electrons toward the anodes and a grid electrode is mounted between the cathode and anode electrodes for controlling the amount of electrons passing therethrough.