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公开(公告)号：DE69317017T2
公开(公告)日：1998-09-24
申请号：DE69317017
申请日：1993-06-21
Applicant: IBM
Inventor： LOWE ANTHONY CYRIL , PIETRZAK CHRISTOPHER C
Abstract: An input device for a visual display comprises a light source (210) and a scanner (260) for angularly scanning a light beam from the light source (210) across a plane (40). A photodetector (230) detects interruption of the beam by an article positioned in the plane. The scanner (260) comprises a shutter having a linear array of addressable, electrically actuable shutter elements. Each element is operable to transmit or block light from the light source (210) under the control of a corresponding electrical signal. Because the light beam is scanned by a shutter rather than a mechanical scanner, the device is advantageously more reliable than conventional electromechanical optical input devices.
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公开(公告)号：CA2043175A1
公开(公告)日：1992-02-04
申请号：CA2043175
申请日：1991-05-24
Applicant: IBM
Inventor： BEETESON JOHN S , PIETRZAK CHRISTOPHER C
Abstract: A display system for displaying a visual image in response to a video signal comprising a liquid crystal display panel divided into a plurality of addressable, variable brightness sections, address means for generating a section address corresponding to a section in response to a timing signal, driver means for varying the brightness of the section in response to the brightness signal derived from the video signal, characterized in that the display system further comprises a memory for storing a predetermined correction signal corresponding to the section, and control means coupled to the driver means for varying the brightness signal to reduce brightness non-uniformities in the displayed image in response to the video signal and the correction signal in combination. The control means preferably includes a summing circuit for adding the correction signal to the video signal to produce a summed signal for determining the brightness signal. In another preferred embodiment the control means includes a voltage control circuit for varying the amplitude of the brightness signal in response to the correction signal.
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Patent Agency Ranking
公开(公告)号：DE69317017D1
公开(公告)日：1998-03-26
申请号：DE69317017
申请日：1993-06-21
Applicant: IBM
Inventor： LOWE ANTHONY CYRIL , PIETRZAK CHRISTOPHER C
Abstract: An input device for a visual display comprises a light source (210) and a scanner (260) for angularly scanning a light beam from the light source (210) across a plane (40). A photodetector (230) detects interruption of the beam by an article positioned in the plane. The scanner (260) comprises a shutter having a linear array of addressable, electrically actuable shutter elements. Each element is operable to transmit or block light from the light source (210) under the control of a corresponding electrical signal. Because the light beam is scanned by a shutter rather than a mechanical scanner, the device is advantageously more reliable than conventional electromechanical optical input devices.
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公开(公告)号：DE69012110T2
公开(公告)日：1995-03-30
申请号：DE69012110
申请日：1990-06-11
Applicant: IBM
Inventor： BEETESON JOHN S , PIETRZAK CHRISTOPHER C
Abstract: A display system for displaying a visual image in response to a video signal (10,34), comprising; a liquid crystal display panel (1) divided into a plurality of addressable, variable brightness sections (5); address means (6) for generating a section address corresponding to a section in response to a timing signal (11); driver means (7,8) for varying the brightness of the section in response to a brightness signal (14,15) derived from the video signal (10,34); characterised in that the display system further comprises: a memory (36) for storing a predetermined correction signal (35) corresponding to the section; and control means (31) coupled to the driver means (7,8) for varying the brightness signal (14,15) to reduce brightness non-uniformities in the displayed image in response to the video signal (34) and the correction signal (35) in combination. The control means preferably includes a summing circuit for adding the correction signal to the video signal to produce a summed signal for determining the brightness signal. In another preferred embodiment the control means includes a voltage control circuit for varying the amplitude of the brightness signal in response to the correction signal.
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公开(公告)号：DE69012110D1
公开(公告)日：1994-10-06
申请号：DE69012110
申请日：1990-06-11
Applicant: IBM
Inventor： BEETESON JOHN S , PIETRZAK CHRISTOPHER C
Abstract: A display system for displaying a visual image in response to a video signal (10,34), comprising; a liquid crystal display panel (1) divided into a plurality of addressable, variable brightness sections (5); address means (6) for generating a section address corresponding to a section in response to a timing signal (11); driver means (7,8) for varying the brightness of the section in response to a brightness signal (14,15) derived from the video signal (10,34); characterised in that the display system further comprises: a memory (36) for storing a predetermined correction signal (35) corresponding to the section; and control means (31) coupled to the driver means (7,8) for varying the brightness signal (14,15) to reduce brightness non-uniformities in the displayed image in response to the video signal (34) and the correction signal (35) in combination. The control means preferably includes a summing circuit for adding the correction signal to the video signal to produce a summed signal for determining the brightness signal. In another preferred embodiment the control means includes a voltage control circuit for varying the amplitude of the brightness signal in response to the correction signal.
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公开(公告)号：GB2268324A
公开(公告)日：1994-01-05
申请号：GB9213912
申请日：1992-06-30
Applicant: IBM
Inventor： PIETRZAK CHRISTOPHER C
Abstract: A field emission display comprises a screen (10) divided into a plurality of pixels. Each pixel has a plurality of subpixels (130,140,150) of different phosphor efficacies. A matrix of field emission cathodes (80) is directed towards corresponding pixels of the screen (10). Each cathode has a plurality of arrays (81,82,83) of field emissive tips directed towards corresponding subpixels (130,140,150). The arrays of each cathode (80) comprise different densities of field emission tips to compensate for the differences in the phosphor efficacies of the corresponding subpixels (130,140,150). This advantageously permits tracking between the primary colour components of a gray scale displayed image to be maintained used the same algorithm to translate into voltages for driving the arrays. Therefore, the Colour Point or White Point of the display can be maintained between extremes of gray scale using the same algorithm. Because the separate algorithms are not required for translating the video signals into gate voltages, the row driver circuitry can be greatly simplified.
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公开(公告)号：GB2268263A
公开(公告)日：1994-01-05
申请号：GB9213913
申请日：1992-06-30
Applicant: IBM
Inventor： LOWE ANTHONY CYRIL , PIETRZAK CHRISTOPHER C
Abstract: An input device for a visual display comprises a light source (210) and a scanner (260) for angularly scanning a light beam from the light source (210) across a plane (40). A photodetector (230) detects interruption of the beam by an article positioned in the plane. The scanner (260) comprises a shutter having a linear array of addressable, electrically actuable shutter elements. Each element is operable to transmit or block light from the light source (210) under the control of a corresponding electrical signal. Because the light beam is scanned by a shutter rather than a mechanical scanner, the device is advantageously more reliable than conventional electromechanical optical input devices.
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