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公开(公告)号：DE69015438D1
公开(公告)日：1995-02-09
申请号：DE69015438
申请日：1990-05-14
Applicant: IBM
Abstract: A CRT heater circuit for a CRT display is described, the circuit comprising control means (4) for dynamically varying a voltage (Vh) across the cathode heater in response to variations in the beam current density (I) within the CRT. In this way the optimum voltage across the heater coils is maintained, thus preventing "cathode stripping" at times of peak beam currents, and optimising the CRT's working lifetime.
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公开(公告)号：GB2294135A
公开(公告)日：1996-04-17
申请号：GB9420712
申请日：1994-10-14
Applicant: IBM
Inventor： KNOX ANDREW RAMSAY , EAGLE DAVID JOHN , HUGGINS MARK WAYNE , MADINE ANTHONY
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公开(公告)号：DE69310277D1
公开(公告)日：1997-06-05
申请号：DE69310277
申请日：1993-06-30
Applicant: IBM
Inventor： GIBBS TERENCE KEITH , LUCK GRAHAM , EAGLE DAVID JOHN , MORRISH ANDREW JOHN , FINDLAY VALERIE
Abstract: An elapsed time recording device includes a counter (130) for incrementally advancing a count value from an initial value towards and beyond a threshold in response to successive clock pulses of a clock signal. Control logic (140) enables the counter (130) to incrementally advance the count value in response to a first input (pin 3) and a second input (pin 1) being at or near a first voltage level, and holds the count value in response to the first input (pin 3) being at or near a second voltage level and the second input (pin 1) being at or near the first voltage level. Setting logic (210) sets the count value to a value beyond the threshold in response to the first input (pin 3) and the second input (pin 1) being at or near the second voltage level when the count value is between the initial value and the threshold. Because the device consists essentially of electronic circuit elements, it can be implemented in the form of an application specific integrated circuit package suitable for high volume manufacture at relatively low cost. The device is therefore favourable for use in mass produced electrical appliances. Because the count value is immediately advanced beyond the threshold in response to removal of the second input voltage, advance of the count value towards the threshold cannot be prevented or delayed by tampering with pin connections of the device.
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公开(公告)号：DE69015438T2
公开(公告)日：1995-07-13
申请号：DE69015438
申请日：1990-05-14
Applicant: IBM
Abstract: A CRT heater circuit for a CRT display is described, the circuit comprising control means (4) for dynamically varying a voltage (Vh) across the cathode heater in response to variations in the beam current density (I) within the CRT. In this way the optimum voltage across the heater coils is maintained, thus preventing "cathode stripping" at times of peak beam currents, and optimising the CRT's working lifetime.
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公开(公告)号：GB2273425A
公开(公告)日：1994-06-15
申请号：GB9225835
申请日：1992-12-10
Applicant: IBM
Inventor： EAGLE DAVID JOHN , TAYLOR SIMON DAVID
IPC: H04N5/59
Abstract: A cathode ray tube display comprises a cathode ray display tube 80 having a cathode for emitting an electron beam and a control electrode 61 for controlling the intensity of the electron beam. A video amplifier 30 is connected to the cathode for modulating the electron beam as a function of an input video signal to generate a picture on the screen of the cathode ray display tube. A brightness control circuit 70 varies a voltage on the control electrode 61 to vary the brightness of the picture. A contrast control circuit 60 varies the gain of the video amplifier 30 to vary the contrast of the picture. A beam current limit circuit 50 has a first output TH1 connected to the contrast control circuit 60 for reducing the gain of the video amplifier 30 in response to the electron beam current exceeding a first threshold and a second output TH2 connected to the brightness control circuit 70 for reducing the voltage applied to control electrode in response to the beam current exceeding a second threshold greater than the first threshold. The second threshold prevents excessive beam currents from damaging the EHT generator when the voltage applied to the accelerating electrode of the cathode ray tube is incorrectly adjusted.
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Patent Agency Ranking
公开(公告)号：GB2302489A
公开(公告)日：1997-01-15
申请号：GB9512126
申请日：1995-06-15
Applicant: IBM
Abstract: Display drive means 90-150 generates a picture on the display screen 160 in response to picture information R, G, B, H, V from a video source 20 releasably connectable to the display apparatus. User control means 60 adjusts the picture generated by the display drive means 90-150 in response to a manual input. Selection means 90, 170 may select one of a plurality of sets of control data for communication to the video source 20 in response to a configuration code input via the user control means 60.
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公开(公告)号：GB2269030A
公开(公告)日：1994-01-26
申请号：GB9215896
申请日：1992-07-25
Applicant: IBM
Inventor： GIBBS TERENCE KEITH , LUCK GRAHAM , EAGLE DAVID JOHN , MORRISH ANDREW JOHN , FINDLAY VALERIE MCCLAREN
Abstract: An elapsed time recording device includes a counter (130) for incrementally advancing a count value from an initial value towards and beyond a threshold in response to successive clock pulses of a clock signal. Control logic (140) enables the counter (130) to incrementally advance the count value in response to a first input (pin 3) and a second input (pin 1) being at or near a first voltage level, and holds the count value in response to the first input (pin 3) being at or near a second voltage level and the second input (pin 1) being at or near the first voltage level. Setting logic (210) sets the count value to a value beyond the threshold in response to the first input (pin 3) and the second input (pin 1) being at or near the second voltage level when the count value is between the initial value and the threshold.
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公开(公告)号：GB2262692A
公开(公告)日：1993-06-23
申请号：GB9126997
申请日：1991-12-19
Applicant: IBM
Inventor： MORRISH ANDREW JOHN , EAGLE DAVID JOHN
Abstract: Cathode ray tube display apparatus comprises a cathode ray tube display screen (10) for displaying successive frames of a non-interlaced video image in response to excitation by at least one raster-scanned electron beam. A line timebase circuit (40) sequentially addresses the or each electron beam to successive pixels on the screen in a line of a raster in response to a line timebase sync signal. A frame timebase (50) circuit sequentially addresses the or each electron beam to successive lines of the raster in response to a frame timebase sync signal. The frame timebase circuit (50) comprises means for offseting successive frames of the video image in a direction transverse of the lines of the raster by a distance less than the spacing of adjacent lines of the raster. Gaps between adjacent pixels on successive lines of the raster are made invisible to the viewer because the persistence of a viewers eye effectively integrates the image content of successive frames. Also, because the successive frames have the same image content, there is no low frequency component in the image spectrum below the frame timebase frequency. Therefore, the displayed image is free from objectionable flicker.
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公开(公告)号：GB2264587A
公开(公告)日：1993-09-01
申请号：GB9203771
申请日：1992-02-21
Applicant: IBM
Inventor： GIBBS TERENCE KEITH , LUCK GRAHAM , EAGLE DAVID JOHN , BATEMAN ANTHONY JOHN , LANHAM TONY ERIC
Abstract: In a cathode ray display tube the front of the display screen (20) is shielded from the electric fields generated by the electromagnetic deflection coils (40) by an electrically conductive extension (60') of the usually provided exterior conductive coating 60 on the tube funnel, the extension coating (60') being disposed between the deflection coils (40) and the cathode ray tube envelope (10). Preferably a frustoconical insulating insert 90 electrically insulates the deflection coils from the coating extension 60'. Alternatively, Fig. 3 (not shown), the coating 60 is effectively extended by a conductive coating (62), on the inner face of a flexible plastics frustoconical insert (61), in electrical contact with and secured to the coating 60.
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公开(公告)号：GB2232044A
公开(公告)日：1990-11-28
申请号：GB8911656
申请日：1989-05-20
Applicant: IBM
Abstract: A CRT heater circuit for a CRT display is described, the circuit comprising control means (4) for dynamically varying a voltage (Vh) across the cathode heater in response to variations in the beam current density (I) within the CRT. In this way the optimum voltage across the heater coils is maintained, thus preventing "cathode stripping" at times of peak beam currents, and optimising the CRT's working lifetime.
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