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7595490 |
Charged particle beam emitting device and method for operating a charged particle beam emitting device
A method for operating a charged particle beam emitting device and, in particular, an electron beam emitting device including a cold field emitter is provided. The method includes the steps of...
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7544951 |
Electron gun assembly
A device which employs an electron beam, for performing a desired function, includes an electron gun for generating the electron beam. The electron gun includes a barrel shaped rotatable structure...
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7286175 |
Bias control circuitry for cathode ray tube beam currents
Bias control circuitry and method for use in controlling one or more cathode ray tube (CRT) beam currents.
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6970203 |
Automatic cut-off system
The automatic cut-off system includes a video data processing circuit, a cut-off control circuit, a drive circuit, and a level control section. The video data processing circuit adds a cut-off...
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6937287 |
Video processing apparatus and method
In order to reduce the total capacity of a ROM used for adjustment of the black level and the white level of a digitized luminance signal for a television receiver, for example, a comparator...
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6888575 |
Digital cut-off control loop for TV using speeding and blanking circuits
An improved digital cut-off control loop for black level adjustment in a video processor for controlling RGB output signals. The improved circuit advantageously provides a higher resolution of the...
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6703802 |
Saturation suppression of CRT output amplifiers
The invention provides a circuit for controlling a cathode ray tube. The circuit comprises a source of input color signals (U in (R), U in (G), U in (B)) for the primary colors of the cathode ray...
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6686710 |
Circuit and method for regulating current using autobias
A circuit for regulating a signal, such as a cathode current. The circuit has an input stage for inputting a signal and for producing a sense signal based thereon. The circuit may input timing...
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6674253 |
Scan velocity modulation technique
A video signal is split into a first signal and a second signal. The first signal includes low amplitude/high frequency components of the video signal, which can be properly amplified by a video...
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6633142 |
Cathode ray tube with low dynamic correction voltage
A cathode ray tube is provided having an electron gun equipped with a main lens having a function of controlling a shape of an electron beam spot which is deflected to the peripheral portion of a...
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6580233 |
Cathode ray tube and intensity controlling method
Disclosed is a cathode ray tube and a intensity controlling method achieving a reduced amount of factors for correcting intensity prepared and capable of performing proper intensity control so that...
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6563276 |
CRT display apparatus
A CRT display apparatus capable of displaying images in high contrast and high brightness without causing noises and halftone-reproduction degradation within dark areas is disclosed. The apparatus...
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6545717 |
Display system having selectable automatic CRT cutoff stabilization or AKB with CRT feedback current simulation
A display system ( 10 ) which includes a CRT feedback current simulating circuit ( 20 ) to simulate the cathode feedback current directly from the from the red, green and blue output biases of the...
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6528958 |
Display device and cathode ray tube
The invention relates to a display device comprising a cathode ray tube including an electron source and an electron beam guidance cavity having an entrance aperture and an exit aperture for...
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6512340 |
Temperature sensor with current mode output for thermal protection for a cathode ray tube (CRT) driver
One embodiment of the present invention includes a temperature sensor with current mode output utilized within a cathode ray tube (CRT)-based display system for providing thermal protection to a...
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6512339 |
CRT display device
In a CRT display device including a CRT (MM tube) having brightness higher than that in the background-art CRT, it is an object of the present invention to improve contrast and prevent conspicuous...
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6495978 |
CRT display device and cutoff adjustment method
A cutoff adjustment method of a CRT using a Hi-Gm tube is proposed as well as a problem that luminance of a display screen is changed by a fluctuation of a Gm voltage to be applied to a Gm...
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6456019 |
Real time measurement of leakage current in high voltage electron guns
A method and a apparatus are provided for operating an E-beam system including an E-beam source for generating an E-beam directed along a column axis and an electrode aligned with the column axis...
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6388403 |
Process and device for color adjustment of a color monitor
A process for color adjustment of a color monitor including a cathode-ray tube and a brightness adjustment module includes providing a nominal brightness signal downstream of a white level...
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6369527 |
Vertical blanking circuit and bias clamp boost supply
A vertical blanking amplifier and bias clamp boost supply in accordance with the present invention uses the amplified vertical blanking signal to generate the boosted high voltage needed for...
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6329770 |
Control of emission in a video display
Unintentional emissions are controlled responsive to the spectral content of the display signal. A video display apparatus comprises a cathode ray tube for video image display. A processor controls...
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6313878 |
Method and structure for providing an automatic hardware-implemented screen-saver function to a display product
A hardware-implemented screen-saver prevents burn-in of an image displayed on a screen of a display product by automatically reducing the video gain, and therefore the contrast, of the image when...
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6288690 |
Video control circuit for a video display device
A video control circuit controls the gains for red(R), green(G), and blue(B) color video signals inputted to a monitor, the brightness and contrast of a video display on the monitor, and the bias...
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6285401 |
Apparatus for suppressing overshoots in kinescope beam current measurement pulses
Display apparatus includes a kinescope cathode current sensor (18) coupled to a load (200) for developing a beam current measurement pulse during a beam current measurement interval. Overshoots in...
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6262543 |
Oscilloscope intensity regulation apparatus
An oscilloscope intensity regulation apparatus is disclosed. The oscilloscope displays wave-forms with the regulated intensity in spite of various wave-form repetition rates or sweep ranges. The...
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6259216 |
Cathode ray tube
A cathode ray tube is described having at least one electron gun including a cathode, a control grid, and a focusing unit, and a strip made of electrically conductive material applied to the...
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6226037 |
AKB interface circuit for kine driver IC
An AKB interface apparatus in a display system (10), includes a video signal processing IC (12) having outputs coupled via respective kinescope driver ICs (18,20,22) to respective kinescope...
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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...
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6211629 |
Cut-off level setting
The cut-off level (Vcod) of a drive signal (Vd) of a cathode ray tube (3) is (Ib1, Ib2) occurring at these two levels (Vd1, Vd2).
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6208094 |
Multiplexed video interface system
A multiplexed video amplifier circuit includes a video preamplifier and a bias/brightness circuit the output of both being coupled to a switch. The video preamplifier provides a video signal, the...
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6204882 |
γ matching of a video processor by means of three measured currents
Recent circuit concepts inject measurement lines, for cutoff and drive control of the cathode current, into each color channel during the vertical frame blanking period. Owing to the physically...
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6137245 |
Circuit for generating control grid voltage for cathode ray tube
A control grid voltage generating circuit comprises a high voltage source, a low voltage source and an amplifier biased by the high/low voltage sources. The high voltage source is coupled to the...
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6069660 |
Automatic black level stabilizing apparatus
An apparatus for automatically stabilizing the black level of a displayed picture when (1) an automatic black level stabilizing function is OFF, (2) black level error occurs between at an ON state...
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6040664 |
Circuit for limiting the beam current of a cathode ray tube
In a television receiver, a higher beam current is enabled and a brighter image is provided, without adversely effecting the life of the cathode ray tube or endangering the high-tension...
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5994841 |
Circuit for biasing display device by compensating for a varying leakage current
A circuit apparatus and method is disclosed for determining the actual beam current of a display device having at least one cathode and that actual beam current is used to both correctly bias a...
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5892337 |
Black level setting
In a method of black level and gain control setting, including the steps of applying (42) at least two mutually differing control values (Vd1, Vd2) in a first predetermined ratio, and controlling...
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5828190 |
G1 High frequency drive for color cathode ray tubes
The frequency roll-off experienced by video signals applied to the three cathodes of a color cathode ray tube, due to the capacitance between the cathodes and the common control grid, is...
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5793166 |
Image display device comprising a cathode ray tube
An image display device (1) which includes a cathode ray tube is provided with a cathode system (2) for the emission of a plurality of electron beams (3) whereby a phosphor screen (4) is scanned in...
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5731959 |
Resistor-printed board built in a flyback transformer for a video display appliance
A resistor-printed board built in a flyback transformer for a video display appliance with a reduced size as well as the resistance error of the printed resistors. A focus volume and a screen...
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5726540 |
Transient enhancement circuit for CRT amplifier
A transient improvement circuit is disclosed for cathode ray tube (CRT) amplifiers with automatic kinescope bias feedback circuits. An NPN transistor and a PNP transistor are provided, each having...
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5714842 |
Automatic cutoff control for a DC coupled CRT video drive
The present invention, generally speaking, provides for automatic cutoff control in a DC coupled CRT video drive using a low DC supply voltage and circuitry that is lower in power consumption than...
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5712538 |
CRT display device comprising a filter in the cathode modulator
A phosphor screen in a display device is scanned by separate electron beams in order to generate images of different frequency content in one color in substantially the same part of the phosphor...
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5705891 |
Power supply for reducing the power consumption of digital oscilloscope
In a digital oscilloscope for indicating an input signal waveform on a display, all or part of the circuits which constitute the oscilloscope are de-energized in accordance with at least one of an...
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5686801 |
Cathode current detecting method and detecting circuit capable of correctly detecting cathode current by clamping leak current at 0 V
A cathode current detecting method wherein both a highlight detection pulse used to detect a white component and a cutoff detection pulse used to detect a black component are input to a signal...
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5682087 |
Cathode current stabilization
A CRT compensation system (10) is disclosed which utilizes a cathode stabilizer circuit (16) to correct a cathode current I k which deviates from an ideal transfer function. The cathode stabilizer...
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5583578 |
Projection-type video display apparatus capable of correcting an asymmetrical brightness distribution
The gain of a variable gain amplifier for amplifying a video signal is changed in accordance with a brightness correction control signal that is output from a waveform ROM. The shape of the output...
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5550443 |
Automatic beam current control circuit for multimode monitor and method thereof
An automatic beam current control circuit for a multimode monitor provides a high voltage circuit for regulating its output voltage according to a video signal being applied to a cathode ray tube,...
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5525794 |
Electronic gain control for photomultiplier used in gamma camera
An electronic gain control is disclosed for the photomultipliers of a gamma camera which assures that all photomultipliers in the camera have uniform gain for any given ganuna event. A specific...
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5488417 |
Automatic kinescope bias control system
A controllable current source in an AKB circuit applies a measurement current to a kinescope driver amplifier during selected lines of the vertical interval of a video input signal to induce a beam...
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5463288 |
Bus controlled electrode voltage for a cathode ray tube
A screen grid voltage or a focus voltage for a cathode ray tube is controlled via a digital-to-analog converter. The voltage variation range of the screen grid or focus voltage that can be obtained...
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