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公开(公告)号：DE69521268T2
公开(公告)日：2001-11-08
申请号：DE69521268
申请日：1995-10-26
Applicant: IBM
Inventor： KNOW ANDREW , BEETESON JOHN S
Abstract: A touch sensor input for a computer display is disclosed in which a conductive coating on the front surface of the display screen is used to determine the position of an object, such as a user's finger, touching the screen. Sensors at the edge of the conductive coating detect changes in the level of ambient field pickup when the user's finger touches the display screen. The conductive coating may optionally be divided into blocks with separate connections to each block, or may have a resistivity profile so as to allow full X and Y co-ordinate determination of the position of the finger. Also, optionally, a stylus generating an electromagnetic field when in contact with the display may be used in place of the finger.
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公开(公告)号：DE69301128D1
公开(公告)日：1996-02-08
申请号：DE69301128
申请日：1993-04-29
Applicant: IBM
Inventor： SAWDON DAVID , BEETESON JOHN S , BEANLANDS PETER , SMITH KENNETH G
Abstract: An electrical appliance comprises a power supply cable (70) having a first conductor (200) surrounded by a second conductor (210) for supplying electrical power to the appliance from a domestic electricity mains supply, and a connector (490) connected to cable for detachably connecting the conductors of the cable to first and second voltage signals of the electricity mains supply. In operation, the second conductor (210) is connected to the lower of the voltage signals. The second conductor (210) thus acts as a shield in opposition to electric fields radiating from the cable. The shield improves in efficiency as the lower mains voltage signal approaches Ground potential.
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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：DE69402615D1
公开(公告)日：1997-05-22
申请号：DE69402615
申请日：1994-02-03
Applicant: IBM
Inventor： JACKSON FREDERICK S , LEAVER DAVID , KNOX ANDREW RAMSEY , BEETESON JOHN S
Abstract: A cathode ray tube display having reduced electric field emissions comprising a cathode ray tube 100, an element 200 for detecting modulations in the final anode voltage of the CRT, the signal not being directly dependent on the deflection driving means 115. A matching network 205 provides phase and gain correction to the signal from element 200, amplification means 210 receives the signal from network 205 and an emission means 215 radiates a cancelling electric field dependent on the modulations detected by said element 200.
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Patent Agency Ranking
公开(公告)号：DE69301128T2
公开(公告)日：1996-07-04
申请号：DE69301128
申请日：1993-04-29
Applicant: IBM
Inventor： SAWDON DAVID , BEETESON JOHN S , BEANLANDS PETER , SMITH KENNETH G
Abstract: An electrical appliance comprises a power supply cable (70) having a first conductor (200) surrounded by a second conductor (210) for supplying electrical power to the appliance from a domestic electricity mains supply, and a connector (490) connected to cable for detachably connecting the conductors of the cable to first and second voltage signals of the electricity mains supply. In operation, the second conductor (210) is connected to the lower of the voltage signals. The second conductor (210) thus acts as a shield in opposition to electric fields radiating from the cable. The shield improves in efficiency as the lower mains voltage signal approaches Ground potential.
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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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公开(公告)号：CA1184316A
公开(公告)日：1985-03-19
申请号：CA384830
申请日：1981-08-28
Applicant: IBM
Inventor： BEETESON JOHN S , HOLLOWAY BRIAN L , JARZEBOWSKI KRZYSTOF T
Abstract: A colour cathode ray tube display apparatus is provided with compensation for errors due to interfering magnetic fields in which a deflection yoke causes the electron beams to raster scan across the tube, a convergence assembly on the neck of the CRT adjusting the beam convergence. Errors in the waveforms supplied to the radial convergence assembly are due to high frequency magnetic field coupling between the yoke and the convergence assembly via the internal magnetic structure (7) of the CRT. A compensating coil (11) placed adjacent the affected convergence coil unit (12, 16) supplies compensating current through resistor (20) to the amplifier (15) driving that convergence coil unit, thus avoiding a fringe on the left-hand side of the screen. Alternatively, compensating current can be derived from the line flyback pulse or the logic signal initiating line flyback.
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公开(公告)号：FI112721B
公开(公告)日：2003-12-31
申请号：FI942813
申请日：1994-06-14
Applicant: IBM
Inventor： JACKSON FREDERICK S , LEAVER DAVID , KNOX ANDREW RAMSAY , BEETESON JOHN S
Abstract: A cathode ray tube display having reduced electric field emissions comprising a cathode ray tube 100, an element 200 for detecting modulations in the final anode voltage of the CRT, the signal not being directly dependent on the deflection driving means 115. A matching network 205 provides phase and gain correction to the signal from element 200, amplification means 210 receives the signal from network 205 and an emission means 215 radiates a cancelling electric field dependent on the modulations detected by said element 200.
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公开(公告)号：DE69521268D1
公开(公告)日：2001-07-19
申请号：DE69521268
申请日：1995-10-26
Applicant: IBM
Inventor： KNOW ANDREW , BEETESON JOHN S
Abstract: A touch sensor input for a computer display is disclosed in which a conductive coating on the front surface of the display screen is used to determine the position of an object, such as a user's finger, touching the screen. Sensors at the edge of the conductive coating detect changes in the level of ambient field pickup when the user's finger touches the display screen. The conductive coating may optionally be divided into blocks with separate connections to each block, or may have a resistivity profile so as to allow full X and Y co-ordinate determination of the position of the finger. Also, optionally, a stylus generating an electromagnetic field when in contact with the display may be used in place of the finger.
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