Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7352409 | Blue stretch circuit and level detection circuit A blue stretch circuit of this invention has a first voltage detection circuit and a second voltage detection circuit, each of which detects that an amount of each of the first and the second color difference signals are within a predetermined range, a blue stretch ... | 04/01/2008 |
| RE39962 | Method and apparatus for controlling power consumption in a tilt correcting coil A method for controlling the power consumption in a tilt correcting coil is disclosed. The power consumption is corrected Controlling power consumption in the tilt correcting coil for correcting to correct the tilt of the images of on the cathode ray tube. If W... | 12/25/2007 |
| 7235935 | Passive compensation of focus tracking utilizing winding and capacitor A video display apparatus includes a cathode ray tube and a high voltage transformer. The high voltage transformer incorporates a high voltage winding for producing an anode voltage in the cathode ray tube. The high voltage winding has a tap which provides a focus v... | 06/26/2007 |
| 7170239 | Circuit and method for reducing east-west geometry mismatch between the top and bottom of a raster display The present disclosure describes a technique for reducing east-west geometry mismatch between the top and bottom of a raster display. This is accomplished by generating a horizontal correction signal that does not have any discontinuities. Since there are no discont... | 01/30/2007 |
| 7102302 | Waveform generator for controlling an electron beam in a cathode ray tube A parabola generator for providing dynamic correction includes a capacitor source of a parabolic input signal at a frequency related to a horizontal deflection frequency coupled to a first terminal of the capacitor. A diode switch is coupled to a voltage at a refere... | 09/05/2006 |
| 7034817 | Method and device of alignment of a video image with an edge of a display screen The aligning a video image with an edge of a display screen, the video image being displayed by a scanning of lines of the display screen by at least one electron beam modulated by a modulation signal, including, for each scanned line of the screen, storing successi... | 04/25/2006 |
| 6798155 | Color image display device A color image display device has an auxiliary means for compensating brightness simply and inexpensively by using an electron gun of a cathode ray tube. Brightness uniformity is improved in the image display device having a flat-type color cathode ray tube with a gl... | 09/28/2004 |
| 6700337 | Apparatus for generating dynamic focus signal An apparatus for generating a dynamic focus signal appropriate for a flat-type CDT, or flat-screen CRT has a first multiplier for receiving a horizontal sawtooth wave and outputting the square component of the wave; a second multiplier for receiving a ver... | 03/02/2004 |
| 6664747 | Dynamic focus regulation circuit of display apparatus A horizontal dynamic focus regulation circuit, which induces a horizontal dynamic focus waveform voltage by a horizontal deflection circuit generating a different frequency according to a display mode of a display apparatus, comprising a microcomputer out... | 12/16/2003 |
| 6580232 | Dynamic focus voltage amplitude controller A dynamic focus voltage generator includes a source of a flyback input signal at a horizontal deflection frequency. A double integrator is responsive to the input signal for generating a parabolic periodic signal. An amplitude detector is responsive to th... | 06/17/2003 |
| 6559609 | Raster center control circuit for CRT-type display device A raster center control circuit for a CRT-type display device that automatically determines a correct horizontal center position of a raster, regardless of a horizontal sync frequency input from a video card. The raster center control circuit includes a h... | 05/06/2003 |
| 6548968 | Electrode assembly and dynamic focus electron gun utilizing the same An electrode assembly includes at least first and second electrodes for forming one or more dynamic quadrupole lenses to emit electron beams and an electron gun using the same. A first parabolic waveform signal having voltages decreasing from the center t... | 04/15/2003 |
| 6504324 | Color-cathode-ray-tube electron gun and color cathode-ray tube A color-cathode-ray-tube electron gun of the present invention comprises a three-divided first focus electrode and a second focus electrode set so as to oppose the first focus electrode: wherein a parabolic-waveform voltage synchronizing with horizontal s... | 01/07/2003 |
| 6489735 | Generating a non-linear waveform In a waveform generator, a repetitive non-linear waveform is generated by varying the number supplied to a pulse reduction circuit during the repetition period. Consequently, the pulse reduction circuit supplies a number of desired output pulses, which nu... | 12/03/2002 |
| 6459219 | Horizontal deflection circuit with dynamic S-correction A simple and cheap dynamic S-correction circuit compensates the higher order errors like the so-called moustache effect and the inner linearity distortion. This is achieved in a known way by connecting an additional proper tuned S-capacitor in parallel wi... | 10/01/2002 |
| 6404147 | Display apparatus monitoring a threshold level for controlling a dynamic focusing circuit A display apparatus including a CRT provided with an electron gun having a focusing electrode which is applied with a dynamic focusing voltage for focusing electrons drawn from a cathode of the CRT is disclosed. The display apparatus includes a dynamic fo... | 06/11/2002 |
| 6351086 | Display correction waveform generator for multiple scanning A method for generating display correction waveforms for a CRT display comprises the steps of selecting one of a plurality of trace portions for forming part of a correction waveform, the trace portions having different average values. Completing each of ... | 02/26/2002 |
| 6278246 | Dynamic focus voltage amplitude controller and high frequency compensation A video imaging apparatus includes a cathode-ray tube including a focus electrode. A source of a first parabolic signal at a frequency related to a deflection frequency, selected from a plurality of frequencies, has an amplitude determined in accordance w... | 08/21/2001 |
| 6215259 | Apparatus for compensating for corner focus and brightness in cathode ray tube An apparatus for compensating for corner focus and brightness in a CRT improves compensation efficiency for corner focus and brightness regardless of the dimensions of the CRT and minimizes the manufacturing cost and power consumption. The apparatus for c... | 04/10/2001 |
| 6151082 | Horizontal focus controlling apparatus for cathode-ray tube The present invention relates to a horizontal focus controlling apparatus which compensates for a distortion generated on a screen of a computer or a TV set. The apparatus includes select signal generating means for dividing the period of a sawtooth signa... | 11/21/2000 |
| 6141627 | Method and apparatus for controlling power consumption in a tilt correcting coil A method for controlling the power consumption in a tilt correcting coil is disclosed. The power consumption is corrected in the tilt correcting coil for correcting the tilt of the images of the cathode ray tube. If a microcomputer judges that the mode is... | 10/31/2000 |
| 6023133 | Parabolic signal generator A parabolic signal generator (100) for use in a cathode ray tube (CRT) display circuit, comprising: programmable delay means (110) for receiving a CRT horizontal flyback signal and for producing a trigger signal which is delayed relative to the horizontal... | 02/08/2000 |
| 5977726 | CRT system using electrostatic quadruple lens A CRT system is provided, preventing the resolution on a phosphor screen from degrading due to the characteristic or performance variation and/or deviation of an electron gun. The electron gun has cathodes for emitting R, G, and B electron beams. First an... | 11/02/1999 |
| 5977728 | Circuit for controlling a horizontal focus signal in a monitor A circuit for controlling a horizontal focus signal improves picture quality, which has horizontal and vertical focus signal generating sections for generating parabola-shaped horizontal and vertical focus signals according to horizontal and vertical defl... | 11/02/1999 |
| 5661376 | Switching clamp A circuit in accordance with an inventive arrangement comprises: a signal generator for a correction signal having a substantially parabolic shape at a scanning rate of the video display; a waveform clipper coupled to the signal generator for the correcti... | 08/26/1997 |
| 5576774 | Convergence adjusting apparatus capable of independently performing convergence adjustment on one adjustment point without affecting the convergence of the remaining adjustment points In a convergence adjusting apparatus, there are generated waveform signals for adjustment, each level of which becomes zero at a plurality of adjustment points on a display except for one adjustment point. The levels of the waveform signals for adjustment... | 11/19/1996 |
| 5473224 | Convergence correction apparatus A convergence correction apparatus comprises: a scanning waveform generating section (6) for generating a scanning waveform in synchronization with a sync signal for scanning an electron beam in a cathode ray tube (8); an amplitude control section (7) for... | 12/05/1995 |
| 5218275 | Beam landing location error correction arrangement A horizontal rate parabolic voltage generator is responsive to a reset pulse at the horizontal rate for generating a horizontal rate parabolic voltage that includes a pulse in the vicinity of horizontal retrace. The parabolic voltage is coupled to an auxi... | 06/08/1993 |
| 5173644 | Convergence correction apparatus A convergence correction apparatus comprising a core for producing a bias magnetic field. The core has first, second, third and fourth coils provided thereon. The first and second coils are wound to produce a magnetic field in a direction opposite to the ... | 12/22/1992 |
| 4988926 | Color cathode ray tube system with reduced spot growth A color cathode ray tube system comprising three coplanar electron guns and one deflection unit. A dynamically controlled element driving the outer electron beams away from each other is arranged at the input side of the deflection unit. The underconverge... | 01/29/1991 |
