Patents by Inventor Siebe T. De Zwart
Siebe T. De Zwart has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20120062991Abstract: An autostereoscopic display device has both a barrier arrangement and a lens arrangement. A plurality of views are provided to different lateral viewing directions. At least a portion of the field of view has autostereoscopic output, and the portion having autostereoscopic output has no repetition of individual 2D views and comprises at least three individual 2D views. This means there is no reversal of the stereo views (“pseudo stereo views”) at viewing cone boundaries as there are no viewing cone boundaries.Type: ApplicationFiled: May 7, 2010Publication date: March 15, 2012Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Marcellinus Petrus Carolus Mich Krijn, Siebe T. De Zwart, Fetze Pulman, Lieven R.R. Desmet, Oscar Henricus Willemsen
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Patent number: 8134590Abstract: In a stereoscopic display apparatus having optical directory elements such as lenticular elements (4) extending parallel to each other and being slanted at an angle to one of the rows and columns of picture elements the appearance of so called dark bands is prevented by certain combinations of the slant angle and the lens pitch.Type: GrantFiled: April 20, 2006Date of Patent: March 13, 2012Assignee: Koninklijke Philips Electronics N.V.Inventors: Siebe T. De Zwart, Willem L. Ijzerman, Tim Dekker
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Publication number: 20110280018Abstract: A beam direction controlling device (22; 30; 45; 60; 80), for controlling a direction of a light-beam emitted by a light-source (21) and passing through the beam direction controlling device (22; 30; 45; 60; 80).Type: ApplicationFiled: October 2, 2009Publication date: November 17, 2011Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Michel C. J. M. Vissenberg, Fetze Pijlman, Marcellinus P. C. M. Krijn, Siebe T. De Zwart, Willem L. Ijzerman
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Patent number: 7876397Abstract: A backlight (5) for a 3D display device, the backlight (5) comprising a planar light guide (7) through which light is guided transversely by internal reflection. The light guide (7) is provided with a plurality of grooves (8), which are configured to direct light propagating within the light guide (7), out of a face (7f) of the light guide (7) so as to form a plurality of line light sources.Type: GrantFiled: September 23, 2004Date of Patent: January 25, 2011Assignee: Koninklijke Philips Electronics N.V.Inventors: Marcellinus P. C. M. Krijn, Willem L. Ijzerman, Siebe T. De Zwart, Hugo J. Cornelissen
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Publication number: 20080204872Abstract: An 2D/3D autostereoscopic display apparatus comprising a display device (301) is configured to display an image. The display device (301) comprises a plurality of pixels (304, 305). The pixels comprise at least a first group of pixels configured to emit light having a first state of polarization and at least a second group of pixels configured to emit light having a second state of polarization. The apparatus further comprises lenticular means comprising an array of birefringent lenticular elements (307, 317) configured to direct the light output of at least one of said groups of pixels such that the respecttive light (314, 315) output of said groups of pixels is emitted in mutually different directions so as to enable a stereoscopic perception of the displayed image. 2D and 3D areas can be displayed simultaneously. Switchable birefringent lenticutar elements provide a switchable 2D/3D display.Type: ApplicationFiled: July 12, 2006Publication date: August 28, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Willem L. Ijzerman, Siebe T. De Zwart
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Publication number: 20080204550Abstract: In a stereoscopic display apparatus having optical directory elements such as lenticular elements (4) extending parallel to each other and being slanted at an angle to one of the rows and columns of picture elements the appearance of so called dark bands is prevented by certain combinations of the slant angle and the lens pitch.Type: ApplicationFiled: April 20, 2006Publication date: August 28, 2008Applicant: Koninklijke Philips Electronics, N.V.Inventors: Siebe T. De Zwart, Willem L. Ijzerman, Tim Dekker
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Patent number: 6525483Abstract: A display device has row (5) and column (6) electrodes and a movable element (3) and means (17) for supplying voltages to the electrodes. The means supply, in operation, such voltages to the electrodes that use is made of the memory effect of the movable element. More in particular, the electrodes are, in operation, supplied with “on”, “off” and “hold” voltages. Simultaneous application of “on” voltages turns a pixel on, simultaneous application of “off” voltages turns a pixel off. Application of a “hold” voltage on either of the electrodes preserves the state of the pixel.Type: GrantFiled: August 22, 2000Date of Patent: February 25, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Gerardus G. P. Van Gorkom, Siebe T. De Zwart
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Patent number: 6522081Abstract: Plasma display panel in which the fluorescent layer, a dielectric layer having a high relative dielectric constant, is provided between the electrodes and the phosphor(s). This improve the efficacy of the device and lowers minimum sustain voltage and firing voltages.Type: GrantFiled: August 2, 2000Date of Patent: February 18, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Gerrit Oversluizen, Siebe T. De Zwart, Sybrandus Van Heusden
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Patent number: 6414445Abstract: Plasma display panel in which the fluorescent layer comprises non-saturating green phosphor(s). This improves the efficacy of UV-light generation and allows the use of higher sustain voltages, leading to further improvement of the efficacy and luminance. The display panel may include driver means for sustaining a generated plasma with a sustain voltage whose peak to peak voltage is at least 400V. This can be combined with existing red and blue phosphor to obtain a desired color.Type: GrantFiled: February 22, 2001Date of Patent: July 2, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Sybrandus Van Heusden, Gerrit Oversluizen, Siebe T. De Zwart
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Patent number: 6388644Abstract: In a plasma display or a field emission display, sub-pixels having extra (non-saturating) phosphors are applied to enhance the efficacy. Depending on the luminance and color of a pixel to be displayed, driving of the most efficient combination of sub-pixels is performed.Type: GrantFiled: February 22, 2000Date of Patent: May 14, 2002Assignee: U.S. Philips CorporationInventors: Siebe T. De Zwart, Sijbrandus Van Heusden, Gerrit Oversluizen
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Publication number: 20020014846Abstract: Plasma display panel in which the fluorescent layer comprises non-saturating green phosphor(s). This improves the efficacy of UV-light generation and allows the use of higher sustain voltages, leading to further improvement of the efficacy and luminance.Type: ApplicationFiled: February 22, 2001Publication date: February 7, 2002Applicant: U.S. PHILIPS CORPORATIONInventors: Sybrandus Van Heusden, Gerrit Oversluizen, Siebe T. De Zwart
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Patent number: 6222324Abstract: Plasma display panel in which the fluorescent layer comprises non-saturating green phosphor(s). This improves the efficacy of UV-light generation and allows the use of higher sustain voltages, leading to further improvement of the efficacy and luminance. The display panel may include drive means for sustaining a generated plasma with a sustain voltage whose peak-to-peak voltage is a least 400 V. This can be combined with existing red and blue phosphor to obtain a desired color.Type: GrantFiled: October 18, 1999Date of Patent: April 24, 2001Assignee: U.S. Philips CorporationInventors: Sybrandus Van Heusden, Gerrit Oversluizen, Siebe T. De Zwart
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Patent number: 6188178Abstract: Picture display device having a vacuum envelope with a face plate whose inner side is provided with a luminescent screen having a repetitive pattern of triplets of red, green and blue-luminescing phosphor elements, a rear plate at a short distance therefrom and in the space therebetween a plurality of electron emitters and juxtaposed, electron ducts cooperating therewith and having walls of substantially electrically insulating material having a secondary emission coefficient suitable for electron transport for transporting, through vacuum, produced electrons in the form of electron currents. Means are provided for withdrawing each electron current at predetermined locations from its duct and for directing this current towards a desired location on the luminescent screen for producing a picture composed of pixels.Type: GrantFiled: April 10, 1995Date of Patent: February 13, 2001Assignee: U.S. Philips CorporationInventors: Gerardus G. P. Van Gorkom, Petrus H. F. Trompenaars, Siebe T. De Zwart, Nicolaas Lambert
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Patent number: 5994828Abstract: Thin-panel picture display device having a luminescent screen and a large emitting plane electron source, such as a large number of juxtaposed electron propagation ducts operating by means of wall interaction of electrons. By means of an addressing system, electrons extracted from ducts are directed towards desired locations on the luminescent screen. The addressing system comprises a preselection system and a fine-selection system with an intermediate spacer plate of insulating material provided with apertures for passing electrons arranged in between. To provide the possibility of applying large voltage differences across the thickness of the spacer plate, the walls of the apertures are at least partly coated with a coating of a low .delta. material having a low secondary emission coefficient (.delta..sub.max .ltoreq.3.5), particularly Si.sub.3 N.sub.4, AlN, Cr.sub.2 O.sub.3 or Y.sub.2 O.sub.3.Type: GrantFiled: February 9, 1998Date of Patent: November 30, 1999Assignee: U.S. Philips CorporationInventors: Siebe T. De Zwart, Gerardus G. P. Van Gorkom, Theunis S. Baller
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Patent number: 5986627Abstract: Flat-panel type picture display device having a luminescent screen and a large number of electron propagation ducts operating by means of electron wall interaction. Electrons are withdrawn from the ducts by means of an addressing system, whereafter these electrons are directed towards desired locations on the luminescent screen. An apertured spacer plate of electrically insulating material for passing electrons is arranged between the addressing system and the screen. To enable large voltage differences to be applied across the dimension of thickness of the spacer plate, the spacer plate is provided with a high-ohmic layer, or with a pattern of a low-ohmic material, or with an equalization layer at one side and with a low-ohmic layer at the other side, and at least the walls of the apertures are preferably coated with a material having a low secondary emission.Type: GrantFiled: June 4, 1993Date of Patent: November 16, 1999Assignee: U.S. Philips CorporationInventors: Siebe T. De Zwart, Gerardus G. P. van Gorkom, Nicolaas Lambert, Petrus H. F. Trompenaars, Bernardus H. W. Hendriks, Gerardus A. H. M. Vrijssen
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Patent number: 5986399Abstract: In, for example a field emission display, the invention provides the possibility of combining a plurality of sub-substrates that are attached to a larger rear wall, because notably different modes of multiplexing provide a wider positioning tolerance of a sub-substrate with respect to the front plate. Moreover, the different multiplexing techniques lead to a smaller number of connections, even if no use is made of a rear wall supporting of sub-substrates. A plurality of multiplexing techniques provides the possibility of activating a substantially equally large number of pixels of different colours during parts of an image period, so that there is substantially no colour flicker.Type: GrantFiled: February 24, 1998Date of Patent: November 16, 1999Assignee: U.S. Philips CorporationInventors: Gerardus Van Veen, Remko Horne, Dirk W. Harberts, Siebe T. De Zwart
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Patent number: 5982086Abstract: A picture display device has a vacuum envelope and is provided with a face plate whose inner side supports a luminescent screen, a rear wall situated at a short distance therefrom, and the space in-between accommodating a plurality of electron sources, which cooperate with a plurality of electron transport duct including dielectric walls fro transporting, through vacuum, the produced electrons towards positions at a small distance from the luminescent screen. The display device further includes means for reducing the effects of undesired charge transfer of the duct walls, which are provided to improve the start-up and/or steady state electron transport conditions. Specifically, the outer sides of the duct rear walls are provided with a conductor to which an initiation potential is applied, which is equal to or higher than the potential applied for producing the electron transport field.Type: GrantFiled: October 27, 1997Date of Patent: November 9, 1999Assignee: U.S. Philips CorporationInventors: Nicolaas Lambert, Gerardus G. P. Van Gorkom, Petrus H. F. Trompenaars, Siebe T. De Zwart
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Patent number: 5966109Abstract: A picture display device having a flat vacuum envelope which is provided with a transparent face plate with a luminescent screen and with a rear wall, which display device has an electron supply section with an electron source for emitting electron currents in a direction parallel to the face plate, and an active selection electrode section with first, preselection, electrodes and second, fine-selection, electrodes, located closer to the screen, for directing each electron current towards desired pixels on the luminescent screen. The fine-selection electrodes are divided into groups and corresponding fine-selection electrodes of at least two groups are interconnected in a series or parallel arrangement in such a way that the technology of providing these electrodes is as simple as possible and/or the possible fine-selection electrode patterns are such that the number of required selection drivers can be reduced considerably.Type: GrantFiled: December 6, 1996Date of Patent: October 12, 1999Assignee: U.S. Philips CorporationInventors: Siebe T. De Zwart, Nicolaas Lambert, Gerardus G. P. Van Gorkom, Petrus H. F. Trompenaars
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Patent number: 5959397Abstract: A picture display device has a vacuum envelope and is provided with a face plate whose inner side supports a luminescent screen, a rear wall situated at a short distance therefrom, and the space in-between accommodating a plurality of electron sources, which cooperate with a plurality of electron transport ducts including dielectric walls for transporting, through vacuum, the produced electrons towards positions at a small distance from the luminescent screen. The display device further includes means for reducing the effects of undesired charge transfer of the duct walls, which are provided to improve the start-up and/or steady state electron transport conditions. Specifically, the outer sides of the duct rear walls are provided with a conductor to which an initiation potential is applied, which is equal to or higher than the potential applied for producing the electron transport field.Type: GrantFiled: March 10, 1997Date of Patent: September 28, 1999Assignee: U.S. Philips CorporationInventors: Nicolaas Lambert, Gerardus G. P. Van Gorkom, Petrus H. F. Trompenaars, Siebe T. De Zwart
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Patent number: 5903094Abstract: Flat-panel type picture display device having a luminescent screen and a large number of electron propagation ducts operating by means of electron wall interaction. Electrons are withdrawn from the ducts by means of an addressing system, whereafter these electrons are directed towards desired locations on the luminescent screen. An apertured spacer plate of electrically insulating material for passing electrons is arranged between the addressing system and the screen. To enable large voltage differences to be applied across the dimension of thickness of the spacer plate, the spacer plate is provided with a high-ohmic layer, or with a pattern of a low-ohmic material, or with an equalization layer at one side and with a low-ohmic layer at the other side, and at least the walls of the apertures are preferably coated with a material having a low secondary emission.Type: GrantFiled: March 13, 1997Date of Patent: May 11, 1999Assignee: U.S. Philips CorporationInventors: Gerardus G. P. Van Gorkom, Petrus H. F. Trompenaars, Gerardus A. H. M. Vrijssen, Siebe T. De Zwart, Bernardus H. W. Hendriks, Nicolaas Lambert