Abstract: A projector includes a first corrector that performs first correction that corrects distortion of an image on first image information to generate first corrected image information, a second corrector that performs second correction that corrects distortion of an image on second image information to generate second corrected image information, a combiner that combines the first corrected image information and the second corrected image information with each other to generate combined image information, and a projection section that projects an image according to the combined image information. The second correction differs from the first correction.

Abstract: The invention relates to the art of communications and particularly to a video signal transmission method, apparatus, system and terminal, where the method includes: separating a current raw digital video signal acquired by a video camera core into a luminance signal and a chrominance signal; converting the luminance signal and the chrominance signal into an analog video signal; transmitting the analog video signal to a master control chip board through an electrically-conductive slip ring; and converting the analog video signal back into the current raw digital video signal in the master control chip board. With the video signal transmission method, apparatus, system and terminal according to embodiments of the invention, the integrity of the transmitted video signal can be improved to thereby guarantee the quality of the video signal.

Abstract: A switching-type vertical deflection output circuit comprises: an output-stage circuit constituted of first and second diodes and first and second switching elements, a smoothing circuit, a vertical deflection coil, a reference vertical sawtooth voltage generation unit, a voltage conversion unit of a vertical deflection current, an error voltage generation unit which obtains an error voltage between the reference vertical sawtooth voltage and the conversion voltage of the voltage conversion unit, a drive unit, and a pump-up circuit which pumps up a power-supply voltage to be supplied to the output-stage circuit during the flyback period. The vertical deflection waveform is stabilized by applying a pump-up pulse of the pump-up circuit to the feedback input terminal through an impedance circuit.

Abstract: A projection display comprises three cathode ray tubes each having a deflection yoke and convergence yoke and each tube generating a raster for projection. One of the three cathode ray tubes has the convergence yoke coupled for current flow in a direction opposite to that of the other two convergence yokes. An amplifier is respectively coupled to each convergence yoke for convergence correction of each raster. A convergence circuit supplies correction signal values that are coupled to each respective amplifier such that convergence correction by the other two convergence yokes is responsive to a difference between the correction signal value coupled to the one convergence yoke and the correction signal values coupled to the other two convergence yokes.

Abstract: A control signal for controlling a correction circuit for at least one electron beam that scans a screen line by line, the amplitude of which varies along each line according to a curve of a first type determined by line parameters, each of the line parameters varying, from one line to another, according to a curve of the first type determined by column parameters.

Abstract: 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 glass panel having a high wedge ratio and a low transmissibility. The color image display includes a panel housing a screen on an inner face thereof, a funnel engaged with the panel; an electron gun engaged with a neck portion of the funnel for emitting electron beams toward the screen, a deflection device for displaying an image by deflecting the electron beams emitted from the electron gun in horizontal and vertical directions with respect to the screen, and a cathode ray tube including a shadow mask aligned from the screen at a predetermined distance.

Abstract: The difference between the time responses of phosphor elements of a plasma display panel (17) shall be reduced by signal processing means without a need of a motion estimator.

Abstract: 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 scanning is applied to the second focus electrode; of the three-divided focus electrodes, a built-in resistor electrically connecting the central electrode and the both outside electrodes is provided; a voltage on which a first voltage component having a waveform similar to serration and synchronizing with horizontal scanning, and a second voltage component having a parabolic waveform convex in the direction opposite to the parabolic waveform and synchronizing with horizontal scanning are superimposed is applied to the central electrode, and a voltage obtained by passing the voltage on which the first voltage component and second voltage component are superimposed through the built-in resistor is applied to the both outside electrodes.

Abstract: 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 number varies in time corresponding to the varying number. For example, when a lower number is inputted to the pulse reduction circuit during a sub-period of the repetition period, a corresponding lower number of output pulses will be generated. Consequently, a lower number of increment values will be summed or integrated during this sub-period and the waveform changes less steeply.

Abstract: A color cathode ray tube has quadrupole elements which increase and decrease the distance between the electron beams as a function of the deflection. Two co-operating elements have their windings connected in series with each other to minimize dissipation in the driving circuits. One driving circuit provides a common current which flows through both quadrupole elements, while another driving circuit provides a difference current to a node between the quadrupole elements.

Abstract: A display device capable of removing a defocused beam spot on the focusing screen by obtaining the fluctuation of a focusing voltage following the fluctuation of a high-tension voltage. There is applied a DC voltage of a predetermined high-tension voltage. Also, there is supplied a dynamic focus (DF) correction waveform such as a parabolic waveform voltage or the like matched with horizontal and vertical deflections or the like, for dynamically controlling the focusing in accordance with the shape of the tubular surface of a cathode-ray tube or the like. Further, there is supplied a peak focus (PF) correction waveform voltage corresponding to the fluctuation of the high-tension voltage. The DF correction waveform and the PF correction waveform are added by an adder. An added signal from the adder is amplified by an amplifier to 600 to 800 Vp-p, for example.

Abstract: The invention and method enable the astigmatism correction at each crossing point of a cross hatch pattern, thereby making high-resolution display possible. An appropriate voltage or current for controlling the magnetic field adjusting coils are generated from the correction data stored in a memory. The voltage or current generated are then applied to two poles, four poles or six poles during scanning of the screen.

Abstract: 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 focusing circuit for producing the dynamic focusing voltage by superimposing, on a dc voltage supplied from outside, an ac voltage which has a waveform varying in synchronization with horizontal and vertical deflections of an electron beam flowing to a fluorescent screen on the anode. The display apparatus further includes a compensator for lowering the dc voltage supplied to the dynamic focusing circuit by a predetermined value while a brightness signal indicative of brightness of a screen of the CRT exceeds a threshold value.

Abstract: A focus compensation apparatus and method for a monitor system are provided. The focus compensation apparatus includes a parabolic signal generation circuit for generating a parabolic signal in synchronization with a horizontal flyback pulse, the waveform of the parabolic signal varying in response to first and second control signals. A video signal focus compensator adjusts the gain of an input video signal such that the gain increases from the center of the monitor screen toward the edge of the monitor screen in response to the parabolic signal. The focus compensator outputs a gain-adjusted video signal as a focus-compensated video signal. According to the focus compensation apparatus, the gain of an input video signal is adjusted using a parabolic signal, the level of which increases from the center of a monitor screen toward the edge of the monitor screen, thereby preventing a picture from being out of focus and blurred at the edge of the monitor screen.

Abstract: A circuit for correction of deflection errors in a television set, in which a correction current having alternate forward-sweep and flyback periods is supplied to a correction coil for an error parameter. An amplitude of the correction current is reduced during a time window which corresponds to the flyback period and in which no visible picture is displayed.

Abstract: The invention relates to a method and a device for reducing an electric field produced by display devices equipped with cathode ray tubes, in their surroundings. According to the invention, a part of a spectrum (ff), caused by a picture content, the level of which is separately adjusted, is discriminated from an interference voltage frequency spectrum (fs), produced by the display terminal and caused by deflection signals (fv, fh). Spurious pulses, significant for the generation of the electric field, are connected to a compensation circuit, wherein they are summed and supplied to a common emitter. The directions of the pulses are determined so that the electric field produced by the emitter reverses the field produced by the display device.

Abstract: 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 the correction waveform by combining each selected trace portion with a respective retrace portion such that all completed correction waveforms have a predetermined average value.

Abstract: A dynamic focus circuit enables ideal focusing characteristics to be obtained across the entire screen of a wide-angled cathode ray tube, by generating a dynamic focus voltage having a flat-bottomed waveform through the addition of a simple circuit to a conventional analog circuit. If an S-shaping voltage method is used, the voltage of a signal induced in a secondary coil of a step-up transformer for raising the voltage of a parabolic waveform signal having a horizontal deflection period switches the gain for converting the parabolic waveform signal to a dynamic focus voltage, according to whether the induced voltage exceeds a specified reference value. If the induced voltage does not exceed the specified reference value, the parabolic waveform signal is converted to the dynamic focus voltage at a gain of less than one.

Abstract: 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 compensating for corner focus and brightness in a CRT includes a CRT, a parabola signal generator for generating a parabola signal from input vertical and horizontal driving pulses, a fly back transformer for supplying high voltage of parabola waveform to an anode electrode of the CRT, an adder for adding the parabola signal of the parabola signal generator and a feedback voltage from the fly back transformer, an error amplifier for amplifying error components of an output voltage of the adder and a reference voltage, and a +B converter for converting the output of the error amplifier to a direct current voltage level required to operate the fly back transformer.