Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 5666129 | Electrical display elements for displaying multiple different conditions A pair of electrical display elements, LEDs, is driven by a three-state buffer driver circuit. The LEDs have associated current-limiting resistors. The driver circuit applies different selected voltage levels at different selected predetermined frequencie... | 09/09/1997 |
| 5567937 | Night vision device wavelength test pattern A night vision device test arrangement for determination of spectral sensitivity field of view and other operating characteristics of night vision devices. The test arrangement includes a controllable array of radiant energy emitters such as narrow-band l... | 10/22/1996 |
| 5482472 | Electrical signal generator interface with three-dimensional electrical pathway and transparent heart and method of visually simulating cardiac waveforms in three dimensions A three-dimensional apparatus is disclosed that provides a view of the electrical pathway of the heart as it pertains to a corresponding electrocardiogram tracing on an external heart monitoring device. Also provided is a method of simulating propagation ... | 01/09/1996 |
| 5450301 | Large scale display using leds A large scale display is made of several panels, each holding several display elements defined by LEDs. Preferably, each panel is arranged so that it can directly replace, both mechanically and electrically, a panel having incandescent bulbs as display el... | 09/12/1995 |
| 5426446 | Display device LED pairs each consisting of two LEDs are arranged in a matrix form to constitute a LED module. Receiving an external clock signal, a timing control circuit generates common signals that set on-periods of drive currents for the LEDs. Each display drive ci... | 06/20/1995 |
| 5410328 | Replaceable intelligent pixel module for large-scale LED displays The apparatus is a detachable LED module which is used to display a pixel on a display. The LED module includes a rear wall and side walls. A plurality of LEDs along with a processor with input and output capabilities are contained within the LED module. ... | 04/25/1995 |
| 5359345 | Shuttered and cycled light emitting diode display and method of producing the same A high resolution, full color display is provided having a liquid crystal pixel selectably addressable during a predetermined time period, a set of at least one red, one green and one blue color light source adjacent the liquid crystal pixel for emitting ... | 10/25/1994 |
| 5278542 | Multicolor display system A multicolor display system comprised of a matrix of light-emitting diodes (LEDs). Each display dot or pixel is comprised of one red LED and one green LED. The display data is stored in a selected one or more discrete locations of a random access memory a... | 01/11/1994 |
| 5194854 | Multicolor logic device A logic device simultaneously indicates on a single multicolor optical output a first logical function and a second diverse logical function of its inputs. The multicolor optical output of the logic device is illuminated in accordance with the first logic... | 03/16/1993 |
| 5184114 | Solid state color display system and light emitting diode pixels therefor Wide color range display systems comprising integrated, phase modulated light from three light emitting diode (LED) pixels. Each pixel comprises a large number of LED chips arranged compactly to provide a discrete element light source of sufficient output... | 02/02/1993 |
| 5164715 | Color display device A color display device comprises a blue color emitting light source consisting of a blue color emitting fluorescent lamp or a white color emitting fluorescent lamp attached with a blue color filter, and a liquid crystal panel for controlling the transmiss... | 11/17/1992 |
| 5134387 | Multicolor display system A multicolor display system comprised of a matrix of light-emitting diodes (LEDs). Each display dot or pixel is comprised of one red LED and one green LED. The display data is stored in a selected one or more discrete locations of a random access memory a... | 07/28/1992 |
| 5122733 | Variable color digital multimeter A multimeter with variable color digital display indicates measured values in a digital format and in a variable color. The multimeter includes a color control circuit for controlling the color of the digital display in accordance with the measurement qua... | 06/16/1992 |
| 5084698 | Illuminated pointer instrument In an indicator instrument, at least one light-emitting diode (8, 9) which lights up in different colors depending on the manner in which it is controlled is provided in a light guide (5). In this way, the pointer instrument can be illuminated in simple f... | 01/28/1992 |
| 5003298 | Variable color digital display for emphasizing position of decimal point A variable color digital display includes a scanner for interrogating an exhibited string of digits to determine the position of a decimal point. Color control accordingly illuminates all digits that precede the decimal point in a first color and all digi... | 03/26/1991 |
| 4967373 | Multi-colored dot display device A multi-colored dot matrix display device and its controller which has a microprocessor and address buffers, data buffers and video memory planes. Each video memory plane has an associated address buffer and an associated data buffer. A graph control data... | 10/30/1990 |
| 4934773 | Miniature video display system A miniature full-page video display which mounts at least one row of light-emitting elements such as LEDs, a magnifying lens, and a vibrating mirror in a light-tight box having an opening through which the mirror may be viewed. The LEDs are selectively il... | 06/19/1990 |
| 4870325 | Ornamental light display apparatus An improved decorative lighting display using LEDs, CMOS integrated circuits and high current MOS transistors. This display provides for an extremely large configuration of LEDs to be driven at low average power and at the same time allows the user to sel... | 09/26/1989 |
| 4851824 | Light emitting diode display panel Each of many two-color light emitting diode elements which make up a display panel includes two light emitting diode chips emitting light of different colors. These elements are so arranged in the panel that chips emitting light of the same color are adja... | 07/25/1989 |
| 4810937 | Multicolor optical device A multicolor optical device having at least three optically stable states includes a plurality of pairs of associated light sensors and light sources for emitting light of respectively different colors when activated. Each light source is divided by an op... | 03/07/1989 |
| 4791415 | Digial driving type color display device A digital color display device comprising a display (12) wherein display elements for displaying respective pixels of three colors are disposed as a matrix and are shifted by 1 pixel or 1.5 pixel in every row, and a driving circuit (13a, 13b) for successi... | 12/13/1988 |
| 4782336 | Two dimensional visual display A two-dimensional visual display comprises one or more groups of one dimensional display components 12 (FIG. 2), each component being formed by spaced individually energizable display elements 11, conveniently l.e.d. groups, attached to a multiconductor c... | 11/01/1988 |
| 4771274 | Variable color digital display device A variable color display device simultaneously indicates values of first digital data in digital format and values of second digital data in variable color.... | 09/13/1988 |
| 4755807 | Colored device for data display A device for the display of data, comprising on the one hand a matrix of luminous dots (11a, 11b, . . . 11n) each of which is constituted by at least one pair of light-emitting diodes arranged in anti-parallel with the color of the light emitted by one di... | 07/05/1988 |
| 4754202 | Multicolor comparison display A multicolor display is disclosed including a plurality of multicolor display areas arranged in rows and columns for simultaneously displaying two display patterns in a comparative fashion. The two patterns are displayed such that portions that appear onl... | 06/28/1988 |
| 4692612 | Switch position detector and indicator with multicolor light emitter A switching device includes a contact movable between two positions, to selectively open and close an electrical path, and a multicolor light emitting diode for indicating different positions of the contact by respectively different colors. The multicolor... | 09/08/1987 |
| 4662737 | Developing color display device of copying machine A developing color display device of a copying machine including a control circuit for outputting a signal corresponding to the developing color in a development cell, light emitting bodies of three primary colors (red, blue and green) that are selectivel... | 05/05/1987 |
| 4580133 | Display device A display device for providing assistance in phonation training or the like has a microphone, comparators, latch circuits, and LED's. When a teacher produces reference sounds, his voice spectrum is displayed on a screen by red LED's, for example, and is c... | 04/01/1986 |
| 4491974 | Receiver having a light emitting display as frequency and tuning indicator A receiver having a light emitting display device indicating the frequency to which the receiver is tuned and the presence or absence of a received signal by the use of visually distinct display modes. In one embodiment, a first color indicates no receive... | 01/01/1985 |
| 4491863 | Color display apparatus A color display device having a display surface constituted by a number of picture elements in which each picture element is made up of one red light emitting elements, two green light emitting elements and one blue light emitting element, to improve the ... | 01/01/1985 |
| 4476465 | Magneto-optic display generator A magneto-optic display generator for disposition in a light beam to provide a projectible, directly viewable, or sensible display image. Two separately driven magneto-optic display chips are positioned between a polarizer and an adjustable polarization a... | 10/09/1984 |
| 4472708 | Front-lighted magneto-optic display A magneto-optic display capable of viewing from available front incident light. The display consists of a polarizing sheet, a blank optical bias magneto-optic chip, a structured magneto-optic chip containing the display to be viewed and a reflective surfa... | 09/18/1984 |
| 4420711 | Circuit arrangement for different color light emission A circuit arrangement for different color light emission, comprises first series circuit of a first light-emitting element having a given color, a diode, and a resistor; and a second series circuit of a second light-emitting element having another color a... | 12/13/1983 |
| 4298869 | Light-emitting diode display A plurality of light-emitting diodes are connected in series to elevate the working voltage. A plurality of said series connection are connected in parallel to maintain display even upon a disconnection accident. The total number of light-emitting diodes ... | 11/03/1981 |
| 4271408 | Colored-light emitting display A plurality of cellular concave mirror surfaces are formed on a plate-like reflector unit, and a plurality of light-emitting diodes are disposed on these cellular concave mirror surfaces to jointly form a colored light source. Connection wirings to be con... | 06/02/1981 |
| 4236178 | Electron microscope with brightness/contrast indicator A series of LED elements is included in a scanning electron microscope in order to indicate the brightness and the contrast of a video signal to be recorded. The brightness is indicated by the position of an illuminating LED element, and the contrast is i... | 11/25/1980 |
| 4086514 | Variable color display device A variable color display device comprising a plurality of display areas arranged in a pattern. Each display area includes a plurality of light emitting areas for emitting light signals of respectively different colors. Each light emitting area has a plura... | 04/25/1978 |
