Plural Crts Patents (Class 348/778)
  • Patent number: 7816909
    Abstract: Methods of characterizing a mechanical stress level in a stressed layer of a transistor and a mechanical stress characterizing test structure are disclosed. In one embodiment, the test structure includes a first test transistor including a first stress level; and at least one second test transistor having a substantially different second stress level. A testing circuit can then be used to characterize the mechanical stress level by comparing performance of the first test transistor and the at least one second test transistor. The type of test structure depends on the integration scheme used. In one embodiment, at least one second test transistor is provided with a substantially neutral stress level and/or an opposite stress level from the first stress level. The substantially neutral stress level may be provided by either rotating the transistor, removing the stressed layer causing the stress level or de-stressing the stressed layer causing the stress layer.
    Type: Grant
    Filed: July 29, 2008
    Date of Patent: October 19, 2010
    Assignees: International Business Machines Corporation, Chartered Semiconductor Manufacturing Ltd
    Inventors: Victor Chan, Khee Yong Lim
  • Patent number: 7339625
    Abstract: A method and a device for soft edge blending of projected display images (16a, 16b) is provided. The method combines optical and electrical soft edge blending in an blending area (26) by using electrical blending in one fraction (146a, 146b) of the blending area (26a, 26b) of two or more overlapping images and using optical blending in another fraction (144a, 144b) of the blending area (26a, 26b). The method according to the present invention overcomes problems with manufacturing, alignment and adjustment of optical masks (148a, 148b) used in optical blending and the difficulties with electrically blending black images. The blending method can also be used in systems providing switching from soft edge blending to hard edge matching.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: March 4, 2008
    Assignee: Barco N.V.
    Inventors: Geert Matthys, Bart Maximus, Glenn Devos
  • Patent number: 7312835
    Abstract: In a projection type display apparatus including a blue CRT display apparatus with low luminous efficiency and low luminous efficiency, the present invention seeks to improve contrast while suppressing the fall in brightness for red, green, and blue color as a whole. In the projection type display apparatus, the images of three colors outputted from three monochrome CRT display apparatuses 10R, 10G, 10B which respectively output monochromatic video signals of red, green, and blue color, are respectively projected on a screen unit 14 via a reflecting mirror 12 so as to synthesize a image of three colors and generate a color image. The brightness of the green CRT display apparatus which outputs the green image having the highest luminous efficiency is increased, while maintaining the brightness of the blue CRT display apparatus 10B. Further, a light absorption means for tinting to reduce the increased green brightness is provided to balance the whole brightness of red, green, and blue.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: December 25, 2007
    Assignee: Sony Corporation
    Inventor: Seiji Kawaberi
  • Patent number: 7268837
    Abstract: A method and system that objectively measures the convergence and focus of a 2 or 3 spatial light modulator (SLM) projection display. The system uses five (5) CCD cameras and a frame grabber to store red, green, and blue (R-G-B) data from selected pixels located in the corners and center of the projector's field-of-view. The horizontal and vertical locations for the R-G-B pixels at each of the five locations is determined and the delta (?) displacement of the green and blue pixels, relative to the reference red pixel, is calculated and used to converge the image. The optical focus of the system is also determined using a Fast Fourier Transform (FFT). The FFT is performed on this same data and a power spectrum summation beyond the first mimima is determined. The focus is then adjusted to maximize this value.
    Type: Grant
    Filed: April 1, 2005
    Date of Patent: September 11, 2007
    Assignee: Texas Instruments Incorporated
    Inventor: Randall Melton
  • Patent number: 7224411
    Abstract: Apparatus and techniques for enhancing characteristics of electronic projection systems are detailed. Included among the techniques are both superimposition of sub-images and tiling of superimposed images, the combination of which can be advantageous in improving resolution of projected images. Pre-modulators and polarizing beam splitters also may be used as parts of the innovative systems.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: May 29, 2007
    Assignee: Imax Corporation
    Inventors: Michael A. Gibbon, Samuel Z. Zhou, Graham H. Moss, Dermot J. Quinn, Steven Wilding, Brian Eckersley, Sean Adkins, Sergei G. Anikitchev, Steven Read
  • Patent number: 7215362
    Abstract: The method for automatically calibrating a multi-projector system with at least two projectors, a digital camera and a control unit for controlling the projectors and the camera is performed according to the following steps: production, capture and image-filtering of strip patterns, finding the largest projection surface possible, and calculation of warp fields and image-warping.
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: May 8, 2007
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung e.V.
    Inventor: Stefan Klose
  • Patent number: 7176986
    Abstract: A projection television including a CRT assembly projecting image beams and a reflecting mirror reflecting the image beams. The projection television has a support casing having support frames provided on both sides thereof below the reflecting mirror, receiving and supporting the CRT assembly, and a lower frame coupled to the bottom of each support frame, supporting the support frame. With this configuration, the present invention provides a projection television having a support casing whose weight is reduced, thereby facilitating transportation thereof and reducing the cost of production and transportation, etc., and further being unlikely to be deformed or deteriorated because of changes in temperature and humidity.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: February 13, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sung-soo Jung
  • Patent number: 7011416
    Abstract: A projection television having a CRT assembly projecting image beams and front and rear casings, respectively provided in a front and a back of the CRT assembly, and further having a pair of CRT brackets provided between the front and rear casings, to support the CRT assembly. The CRT bracket is made of a conductive metallic material, thereby reducing deformation and deterioration because of changes in temperature and humidity, discharging heat generated from the CRT assembly, and blocking EMI.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: March 14, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Nam-Il Cho, Sung-ki Min, Young-tai Kim, Soon-woo Lim, Hyung-sik Jang, Soon-haeng Heo
  • Patent number: 6995810
    Abstract: A method and system that objectively measures the convergence and focus of a 2 or 3 spatial light modulator (SLM) projection display. The system uses five (5) CCD cameras and a frame grabber to store red, green, and blue (R-G-B) data from selected pixels located in the corners and center of the projector's field-of-view. The horizontal and vertical locations for the R-G-B pixels at each of the five locations is determined and the delta (?) displacement of the green and blue pixels, relative to the reference red pixel, is calculated and used to converge the image. The optical focus of the system is also determined using a Fast Fourier Transform (FFT). The FFT is performed on this same data and a power spectrum summation beyond the first mimima is determined. The focus is then adjusted to maximize this value.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: February 7, 2006
    Assignee: Texas Instruments Incorporated
    Inventor: Randall Melton
  • Patent number: 6967632
    Abstract: A multi-monitor is provided with a first display device having a display screen and a second display device having a display screen smaller than the display screen of the first display device, and a supporting mechanism which is mountable on an outside portion of the first display device, and supports the second display device rotatably about a first axis and a second axis intersecting the first axis. The first second display device is driven in accordance with the same operation system as the first display device.
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: November 22, 2005
    Assignee: Kyocera Corporation
    Inventors: Takashi Minami, Yasushi Matsumura, Akio Nishino
  • Patent number: 6822699
    Abstract: A main picture is displayed in monochrome in a main picture display area by emission of a first phosphor layer formed of a white emission phosphor. A second phosphor layer formed of a phosphor different from the first phosphor layer is provided in a region different from the first phosphor layer. Icons are displayed in the icon display area in a color different from the main picture by emission of the second phosphor layer.
    Type: Grant
    Filed: February 8, 2001
    Date of Patent: November 23, 2004
    Assignee: Sony Corporation
    Inventor: Koichi Furui
  • Patent number: 6806872
    Abstract: It cannot be ensured that display setting changes are made at once in a system in which the number of display settings for a display processing apparatus is extremely large, an application is running under an operating system and display setting register change time is unpredictable from the application due to another task, or an internal configuration is incapable of immediately reflecting access from a host CPU to a display setting register. According to the present invention, outputs of a plurality of first display setting registers mapped into an address space for temporarily holding display setting data generated and outputted by a host CPU under control of a write control signal are connected to inputs of a plurality of second display setting registers holding display setting parameters referenced by display output module.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: October 19, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiteru Mino, Masayuki Masumoto
  • Patent number: 6803971
    Abstract: Two of four light sources have canceling characteristics with respect to color nonuniformity, and the other two light sources have canceling characteristics with respect to color nonuniformity. A light emission stop detector detects that each of the light sources stops emitting light by blowing its value for example, and feeds, if a certain light source stops emitting light, information indicating that the light source stops emitting light to an energization controller. The energization controller stops, when it receives the information indicating that a certain light source stops emitting light, the energization to a light source paired with the certain light source and puts out the light source.
    Type: Grant
    Filed: September 17, 2001
    Date of Patent: October 12, 2004
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Hideki Yamamoto, Yoshihiro Sasaki, Hiroki Koba
  • Patent number: 6755535
    Abstract: A projection television set having an enclosure housing a screen, an optical unit and a mirror, wherein the optical unit and mirror are capable of projecting an image onto the screen. The enclosure is preferably constructed from hollow plastic extruded panels. In addition, the enclosure preferably includes a duct extending upwardly from a lower portion of the enclosure to exhaust heat radiating from components housed therein to the exterior of the enclosure toward the top of the enclosure.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: June 29, 2004
    Assignee: Mitsubishi Digital Electronics America, Inc.
    Inventor: Masayoshi Shinobu
  • Publication number: 20030137610
    Abstract: A color reproduction system includes a color conversion unit for displaying a color image on a multi-primary-color display. The color conversion unit includes a maximum brightness signal calculating unit for calculating signals corresponding to three color reproduction area corners as the corners of a plane that constitute a color reproduction area surface of the display. The three color reproduction area corners surround the vectors of input tristimulus values. The maximum brightness signal calculating unit calculates a weighting factor obtained when the input tristimulus values are expressed as a linear sum of the tristimulus values of the color reproduction area corner vectors. The color conversion unit includes a color image signal calculating unit for calculating a color image signal used to display the input tristimulus values, on the basis of the signals corresponding to the color reproduction area corners and the weighting factor.
    Type: Application
    Filed: February 24, 2003
    Publication date: July 24, 2003
    Applicant: OLYMPUS OPTICAL CO., LTD.
    Inventor: Kenro Ohsawa
  • Patent number: 6570623
    Abstract: A multi-projector video wall system employs a blending frame to blend the overlapping portions of two adjacent images I1 and I2. The blending frame is preferably located a distance Dframe from the aperture of the projector and has an optimal half frame width Wf from the axis of the lens of the projector. A camera-based feedback loop can be employed to fine-tune the optical blending by digitally altering the image source.
    Type: Grant
    Filed: April 24, 2000
    Date of Patent: May 27, 2003
    Assignee: Princeton University
    Inventors: Kai Li, YuQun Chen, Timothy Housel
  • Patent number: 6565214
    Abstract: A projection television set having an enclosure housing a screen, an optical unit and a mirror, wherein the optical unit and mirror are capable of projecting an image onto the screen. The enclosure is preferably constructed from hollow plastic extruded panels. In addition, the enclosure preferably includes a duct extending upwardly from a lower portion of the enclosure to exhaust heat radiating from components housed therein to the exterior of the enclosure toward the top of the enclosure.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: May 20, 2003
    Assignee: Mitsubishi Digital Electronics America, Inc.
    Inventor: Masayoshi Shinobu
  • Patent number: 6545718
    Abstract: A control portion detects a level of video signals for each color when video signals are inputted from a frame memory to DSP circuits. Next, the control portion calculates an appropriate correction coefficient of each color to be used in modulation control of brightness, for every unit pixel or unit pixel array among a plurality of correction coefficients stored in its own memory in advance based on the detected signal level. The control portion instructs the DSP circuits to perform modulation of brightness by using the determined correction coefficient.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: April 8, 2003
    Assignee: Sony Corporation
    Inventors: Satoru Nakanishi, Yasunobu Kato, Masamichi Okada
  • Patent number: 6501517
    Abstract: An optical system in a projection television receiver includes: a screen for simultaneously displaying R (Red), G (Green) and B (Blue) images thereon; and a light source part comprising R, G and B cathode ray tubes. The R and B cathode ray tubes project the R and B images on the screen via a reflecting mirror, whereas the G cathode ray tube is set together with the R and B cathode ray tubes in a delta type array and projects the G image directly on the screen.
    Type: Grant
    Filed: July 24, 2000
    Date of Patent: December 31, 2002
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jae-Young Choi
  • Publication number: 20020122141
    Abstract: Disclosed is a video signal processing system for outputting video signals for driving monitors during one period of clock signal. The system includes: a clock signal (CLK) supply part for outputting CLK for transmitting video signal; a monitor controller for outputting memory access signal (MA) by the period of CLK; a memory buffer for outputting data signal according to MA; latch circuits for latching data signal, dividing into multiple data during one period of CLK and outputting the latched data to the monitors; an inverter inverting CLK; a delay circuit delaying inverted CLK; and a flip-flop circuit for outputting in flip-flop after receiving delayed CLK and inputting into the latch circuits.
    Type: Application
    Filed: August 6, 2001
    Publication date: September 5, 2002
    Inventor: Eun Seog Lee
  • Publication number: 20020113909
    Abstract: Systems and methods for changing the visual appearance of an interior space using computer-controlled devices. The computer-controlled devices include a number of video display screens arranged about the interior space to display a series of video images. Several speakers are placed proximate to each video display screen to project ambient sounds associated with the video images being displayed on the video display devices. Several scent generators dispense a scent associated with at least one video image displayed on the video display screens. A central processing unit controls and coordinates the operation of each of the computer-controlled devices to present a multimedia presentation that alters the appearance of the interior space.
    Type: Application
    Filed: February 21, 2002
    Publication date: August 22, 2002
    Inventor: Jeffrey Sherwood
  • Patent number: 6384876
    Abstract: A video projector is arranged with three color CRTs vertically aligned with respect to a forwardly located projection surface. The projection surface is in a room having opposite side walls on either side of said projection surface. The video projector is positioned closely adjacent either of said side walls, thus leaving the ceiling and floor areas of the room unobstructed. The arrangement facilitates non intrusive use of a video projector in a home environment.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: May 7, 2002
    Assignee: Zenith Electronics Corporation
    Inventor: Tom L. Sorensen
  • Patent number: 6377306
    Abstract: A display for producing a seamless composite image from at least two discrete images. The display includes one or more projectors for projecting each of the discrete images separately onto a screen such that at least one of the discrete images overlaps at least one other of the discrete images by more than 25 percent. The amount of overlap that is required to reduce the seams of the composite image to an acceptable level over a predetermined viewing angle depends on a number of factors including the field-of-view and aperture size of the projectors, the screen gain profile, etc. For rear-projection screens and some front projection screens, an overlap of more than 25 percent is acceptable.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: April 23, 2002
    Assignee: Honeywell International Inc.
    Inventors: Michael J. Johnson, Matthew B. Dubin
  • Patent number: 6377317
    Abstract: A rear-projection television set in which two different dynamic focusing waveforms are used. The first dynamic focusing waveform is used only to focus an electron beam in a CRT generating the blue component of the picture being displayed. The second dynamic focusing waveform is used to focus the electron beam in the CRTs generating the red and green components of the picture being displayed. In this way, the resulting picture is better focused without flare or blue edging and displays better color uniformity over the entirety of the television screen.
    Type: Grant
    Filed: April 8, 1999
    Date of Patent: April 23, 2002
    Assignees: Sony Corporation, Sony Electronics, Inc.
    Inventors: Hirohide Kiga, Thomas A. Marflak, David S. Arnold
  • Patent number: 6377319
    Abstract: A projection television set having a screen and three projection units each capable of projecting a monochromatic image onto the screen. The projection units each having a cathode ray tube (CRT) optically coupled to a projection lens, which includes both a C-lens and a compound lens. A spacer preferably having three optical passageways is coupled to and between the CRTs and projection lenses. Each CRT is coupled to the spacer via a holder having a housing adapted to capture the CRT and two mounting brackets, each preferably adapted to distribute a spring load to at least two points on the housing.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: April 23, 2002
    Inventor: Masayoshi Shinobu
  • Patent number: 6369864
    Abstract: A projection television set having a screen and three projection units each capable of projecting a monochromatic image onto the screen. The projection units each having a cathode ray tube (CRT) optically coupled to a projection lens, which includes both a C-lens and a compound lens. A spacer preferably having three optical passageways is coupled to and between the CRTs and projection lenses such that three coolant chambers are formed. Preferably, the spacer includes fluid passageways that interconnect the coolant chambers. The spacer also include coolant fill ports and reservoirs, zero pressure gum tanks seated in the reservoirs, and a plurality of heat exchanging ribs.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: April 9, 2002
    Assignee: Mitsubishi Digital Electronics
    Inventor: Masayoshi Shinobu
  • Patent number: 6342929
    Abstract: The projection image display apparatus includes a plurality of image generating sources for generating three primary colors, including red, green, blue image light, respectively, and a projection lens containing a plurality of lens elements provided in correspondence with each of said image generating sources for enlarging/projecting images displayed by the image generating sources onto a screen.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: January 29, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Kazunari Nakagawa, Tomoharu Nakiri, Naoyuki Ogura, Chihiro Egawa
  • Patent number: 5877823
    Abstract: A projection television device includes a projection cathode-ray tube for red (1a), a projection cathode-ray tube for green (1b) and a projection cathode-ray tube for blue (1c) which are provided with phosphor layers (5a, 5b and 5c), respectively, each having a thickness which varies continuously so that it may be thick at the center portion and may be thinner at the peripheral portion. Having the above configuration, the projection television device makes it possible to suppress the loss in resolution and luminance at the peripheral portion of the image projected on the screen, thereby ensuring uniform resolution and luminance of the image. Thus, it becomes possible to enhance the quality of the image produced on the screen.
    Type: Grant
    Filed: February 8, 1996
    Date of Patent: March 2, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hiroshi Sasaki
  • Patent number: 5559564
    Abstract: A cathode ray tube apparatus for a projection TV system which improves the color purity of the luminescence in the cathode ray tube, reduces the chromatic aberration by the projection lens, enables the same type of projection lens to be mounted for all of the green, red and blue CRT apparatuses, and enables manufacturing costs to be slashed by such a common use of components. A light-absorbing agent is incorporated into the panel glass so that the transmittance having the light of wavelengths other than the main wavelength of the spectrum of luminescence of the phosphor of the CRT apparatus, is reduced below the transmittance of the light of the main wavelength. By incorporating this agent into the panel glass of a green CRT apparatus the average value of the transmittance of the light of the wavelength in the range of 500 nm to 560 nm becomes higher than the transmittance of the light of the wavelengths outside this range.
    Type: Grant
    Filed: July 7, 1994
    Date of Patent: September 24, 1996
    Assignee: Sony Corporation
    Inventor: Tsuneharu Nomura
  • Patent number: 5534949
    Abstract: A two-channel field sequential display system utilizes both simultaneous and sequential color display methods to display full color images in a way that is less complex, smaller in size and less costly than prior art additive color systems, while exhibiting higher light output and fewer temporal visual effects than prior art single-channel field sequential color display systems. The two-channel field sequential display system displays two of three primary colors that make up the image simultaneously during a portion of a display frame and displays the third primary color sequentially during a subsequent part of the display frame. The two-channel field sequential color display concept may be applied to any projection system which combines individual monochrome projector outputs to form an image on a screen or to any display technique that is capable of superimposing two images.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: July 9, 1996
    Assignee: Hughes Aircraft Company
    Inventor: Peter C. Baron
  • Patent number: 5473391
    Abstract: A projection-type image display apparatus, in which a correction raster shape correction circuit is supplied with a sawtoothed-shaped voltage changing in level in accordance with a static convergence regulation voltage for correcting respective raster shapes displayed on the respective picture planes of a plurality of cathode-ray tubes, so that the convergence is not displaced at the peripheral portions of the picture screen at the time of regulating the static convergence.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: December 5, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Masahiro Usui
  • Patent number: 5418579
    Abstract: A multiplanar image display system having a plurality of display units disposed to expose, by transmission through and reflection by transparent panels, displayed images to a viewing end of an image chamber. The images overlap along a common viewing axis to create an illusion of a three-dimensional display. The transparent panels and a primary display unit are disposed along, and secondary display units are displaced from, the viewing axis. The transparent panels and the display units are angled to each other and to the viewing axis. The display units are adjustably mounted; and the distances separating the overlapping images, and thereby the amount of parallax, are controllable as a function of the distances between the display units and their associated reflecting transparent panels.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: May 23, 1995
    Inventors: Kenneth A. Jamieson, John S. Jamieson
  • Patent number: 5373347
    Abstract: A photographic printer that uses a plurality of small CRTs to print wide format images. Within the printer, the CRTs are positioned horizontally adjacent one another but vertically displaced so that image segments displayed by adjacent CRTs either abut or overlap one another. The printer decomposes each line of the image into horizontal image segments, buffers the image segments to compensate for the vertical displacement, and displays the image segments on the CRTs such that they are exposed horizontally aligned with one another on the photographic media. The printer stitches the image at the seams between adjacent segments to reduce the discontinuities in the horizontal image rows.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: December 13, 1994
    Assignee: Metrum, Inc.
    Inventors: Kerry L. Shaklee, Donna M. Bodeau, Jo A. Frank, Gary L. Brackett
  • Patent number: 5367380
    Abstract: In the velocity modulation apparatus for a three-tube projection television, an effective velocity modulation can be implemented under due consideration of humans eye's relative visibility characteristics with respect to the three primary colors of R, G and B, and the velocity modulation apparatus includes a VM signal extracting circuit 1 for extracting a velocity modulation (VM) signal from the luminance signal; a plurality of driving circuits 3 to 5 having three different gains at ratios of 0. 3:0. 59:0. 11; and a red color VM coil 7, a green color VM coil 8 and a blue color VM coil 9 provided for three corresponding Braun tubes, respectively and driven by the driving circuits 3 to 5, respectively.
    Type: Grant
    Filed: October 20, 1992
    Date of Patent: November 22, 1994
    Assignee: Sony Corporation
    Inventor: Tsuyoshi Hirano
  • Patent number: 5337093
    Abstract: In a projection television system having display elements displaying images of respective colors, a screen on which a color image is formed by magnifying and synthesizing the images of the respective colors, projection lenses for magnifying the images on the respective display elements and projecting them onto the screen thereby to form the color image, with the optical axis of the projection lens for a first color being disposed at a right angle to the screen and the optical axes of the projection lenses for second and third colors being disposed at an angle with respect to the optical axis of the projection lens for the first color, color imbalance is reduced. This is achieved by disposing the projection lenses for the second and third colors so that their optical axes are incident on a point different from the point at which the optical axis of the projection lens for the first color is incident.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: August 9, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toshihide Kaneko, Eiichi Toide
  • Patent number: 5298984
    Abstract: A cathode ray tube device employed in a projection apparatus for projecting an image on a screen. The cathode ray tube device includes a supporting frame mounted on a rim of a front panel section of the cathode ray tube, a lens plate in the form of a frame having a center aperture, and having a projection lens system attached to it, and a positioning supporting member detachably mounted on a mounting base plate of the projection apparatus and adapted for positioning the supporting frame and the lens plate with respect to the mounting base plate for detachably supporting the supporting frame and the lens plate by the mounting base plate.
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: March 29, 1994
    Assignee: Sony Corporation
    Inventor: Kiyoshi Numata
  • Patent number: 5293224
    Abstract: A quality of blue light projected on a screen is detected. A ratio of the detected quantity of the light to a whole quantity is calculated. The calculated ratio is compared with a reference ratio, and a deviation of the calculated ratio from the reference ratio is corrected so as to provide a white balance.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: March 8, 1994
    Assignee: Pioneer Electronic Corporation
    Inventor: Kohsuke Ajima