Abstract: A video apparatus includes a data acquisition mode (DAM) module. The DAM module contains memory to store a television program guide information. A standby supply voltage, derived from a first winding of a transformer, is coupled for energizing the DAM module, only during scheduled times, set up by the user. A supply voltage B+ generated from a second winding of the transformer energizes the deflection circuits, during the run mode. Voltage B+ is coupled in a negative feedback path to a voltage regulator. When the DAM module is energized, the deflection circuits are turned off. The energized DAM module causes a significant increase in the current consumption from the first winding of the transformer. A switch is coupled in the feedback path of voltage B+. The switch causes an attenuation of a portion of voltage B+ that is fed back to the regulator, in the DAM operation. Thereby, a tendency of the standby supply voltage to decrease, during the DAM operation, is compensated.

Abstract: A video display deflection apparatus includes a vertical deflection coil. A separator is used for mounting the vertical deflection coil thereon. The separator has a funnel shaped first part conforming to a shape of a neck of the cathode ray tube and a second part forming a front portion of the separator close to the screen. A degree of flare of the first and second parts is substantially different. A saddle shaped, horizontal deflection coil is mounted on the separator for producing a deflection field to scan the electron bean along a horizontal axis of the display screen. The horizontal deflection coil includes a plurality of winding turns forming a pair of side portions, a rear end turn portion, close to an electron gun of the tube and a front end turn portion, close to the screen. At least a portion of the front end turn portion, in a radial angular position ranging between 0 and 30 degrees, is supported on the second part of said separator away from the boundary.

Abstract: A video imaging apparatus includes a source of a periodic dynamic focus voltage blanking signal. A dynamic focus voltage amplifier includes a switch responsive to the dynamic focus voltage blanking signal for applying a dynamic focus voltage to a focus electrode, when the switch is at a first state, and for disabling the application of the dynamic focus voltage, when the switch is at a second state to provide for automatic kine bias measurement. A second switch responsive to the focus voltage blanking signal is coupled to the amplifier for applying a current to a stage of the amplifier, when the dynamic focus voltage is disabled. The applied current adjusts the focus voltage, to a level closer to that established immediately after the dynamic focus voltage is enabled for reducing a transient condition.

Abstract: A television apparatus set has the capability of selectively displaying picture information obtained from a broadcast television signal and a display monitor data signal. A zero voltage switching switch mode power supply generates a higher voltage B+ supply voltage for a horizontal deflection circuit output stage, when the deflection circuit output stage operates at a rate greater than or equal to approximately 32 KHz. A series-pass regulator power supply generates at a common supply terminal a lower voltage B+ supply voltage, when the deflection circuit output stage operates at a lower rate equal to approximately 16 KHz. During a start-up interval, the horizontal scanning output stage is supplied with the lower B+ supply voltage regardless of the scan frequency for reducing excessive stress in the horizontal output stage switching transistor to improve reliability.

Abstract: A direct current focus voltage applied to a focus electrode of a cathode ray tube that produces a blue image is set to slightly defocus the blue image for increasing the blue beam spot size. The increase in the blue beam spot reduces the saturation and allows brighter blue and increased blue video drive range. A passive network is coupled between an ultor electrode and the focus electrode to provide tracking of focus voltage-to-ultor voltage ratio. The tracking prevents voltage fluctuation of the ultor voltage produced by video loading from disturbing uniform defocussing in the entire blue image.

Abstract: A scan frequency detector is responsive to a horizontal synchronization signal to generate a data signal that is indicative of the horizontal scan frequency. A digital-to-analog (D/A) converter produces from the data signal an analog, output signal at a first level, when the horizontal frequency is within a first range of values, at a second level, when the horizontal frequency is within a second range of values and at a third level, when the horizontal frequency is within a third range of values. A first switch of a switched S-capacitor arrangement, is turned on, when the output signal is at the first level. The first switch and a second switch of the switched S-capacitor arrangement, are turned on, when the output signal is at the second level. Both the first and second switches are turned off, when the output signal is at the third level. The third and second levels are distinguished by a level detector that includes a zener diode.

Abstract: A deflection yoke for a cathode-ray tube of a video display, includes a pair of horizontal deflection windings and a pair of vertical deflection windings. The pair of vertical deflection windings includes a saddle-shaped winding. The saddle-shaped winding includes a front end winding portion, close to a screen of the cathode ray tube, a rear end winding portion, remote from the screen and a pair of side winding portions, between the front and rear end portions. The saddle-shaped winding is disposed generally symmetrically with respect to a plane of symmetry. A depression or notch is formed in the front end winding portion for varying a winding distribution locally. The depression or notch forms asymmetry with respect to the plane of symmetry.

Abstract: An deflection yoke for a color cathode ray tube includes a saddle shaped vertical deflection coil and a saddle shaped horizontal deflection coil. The horizontal deflection coil includes winding turns forming a pair of side portions having a winding window therebetween extending free of conductor wires. Each of the side portions has first and second winding spaces. The first winding space forms an aperture occupying an angular range between 30 and 45 degrees and having a length dimension greater than one half a length dimention of the window. A corner portion of the second winding space is disposed in a Z-axis coordinate selected in a range between a Z-axis coordinate of an end of the window, close to the electron gun of the tube, and a Z-axis coordinate, closer to the screen of the tube. The length of the range is approximately 10% of a length of the window.

Abstract: A deflection yoke for a color cathode ray tube includes a saddle shaped vertical deflection coil and a saddle shaped horizontal deflection coil. The horizontal deflection coil includes winding turns forming a pair of side portions, a front end portion, close to a screen of the tube, and a rear end portion, close to an electron gun of the tube. The side portions form a winding window free of conductor wires therebetween extending between the front end turn portion and the rear end turn portion. Each of the side portions has first, second and third winding spaces. The first, second and third spaces extend into longitudinal coordinates that are closer to an electron gun of the tube than an end portion of the window established by the end turn portion.

Abstract: A deflection yoke for a color cathode ray tube includes a saddle shaped vertical deflection coil and a saddle shaped horizontal deflection coil. The horizontal deflection coil includes winding turns forming a pair of side portions having a winding window therebetween extending free of conductor wires. The side portion has a winding space for correcting corresponding portions of coma and convergence errors. A corner portion of the winding space is disposed in a Z-axis coordinate selected in a range between a Z-axis coordinate, defining the end of the window that is close to the electron gun of the tube, and a third Z-axis coordinate, closer to the screen of the tube. The length of the range may be approximately 10% of a length of the window. Correction of convergence error, horizontal coma error or coma parabola error may be obtained without using field shapers such as shunts or magnets.

Abstract: The subject of the present invention is a shift register for an LCD, the stages of which use the Boostrap [sic] effect and can contain just three M.I.S. transistors, as well as enhancements to this circuit with four or seven MIS transistors.The advantages are the low number of components used, the increase in the lifetime of the shift register and the possibility of working with control signals having an amplitude of 5 or 10 v below that of the output signals.

Abstract: A power supply circuit for a video display apparatus having run and standby modes of operation. A resistor has a first terminal coupled to a power supply controller circuit for enabling operation of the power supply controller circuit. A standby mode power supply provides an output voltage for the video display apparatus during a standby mode of operation. The standby mode power supply utilizes a standby transformer having a secondary winding coupled to a second terminal of the resistor. The secondary winding provides a low voltage to the resistor to minimize the power dissipated by the resistor.

Abstract: A head carrier plate is pressed in the direction of the longitudinal axis of the videotape by spring force against stops. The audio control head bears with its lower edge on a support which simultaneously serves as a tape guide of the lower edge of the videotape and as a pivotal support for the audio control head. Only two setting screws are then necessary, with which the head carrier plate can be set in terms of the angle of inclination with respect to the capstan shaft and in terms of the angle of inclination with respect to the longitudinal axis of the videotape.

Abstract: The present invention relates to an optimized method of addressing liquid-crystal screens. In accordance with the invention, the matrix addressing method, periodically scanning each line with a signal of voltage V.sub.A (t) as a function of time, is characterized in that each period of this signal consists of a plateau up to T.sub.F then a curve which may be a straight-line portion of slope .alpha. between T.sub.F and T.sub.F'. Application to liquid-crystal screens.

Abstract: Switched-mode power supplies require a power factor correction circuit in order to comply with anticipated regulations for the harmonic load on the line network. In its second current path, which produces a connection between a rectifier element and a tap on the primary winding of a transformer, the switched-mode power supply contains a capacitor which produces current limiting for an inductance in this current path. When the switching transistor is in the switching mode the inductance is charged, when the switching transistor is switched on, in the sense of an energy store until the capacitor is charged. When the switching transistor is switched off, the inductance and the capacitor are discharged via a diode in the direction of an energy-storage capacitor.

Abstract: A non-switched, DC coupled vertical deflection circuit includes a source of a first DC supply voltage that is coupled to a first end terminal of a vertical deflection winding. An amplifier is energized by a second DC supply voltage having twice the magnitude of the first DC supply voltage and the same polarity. An output voltage of the amplifier having the same polarity of each of the first and second DC supply voltages is developed at a second end terminal of the deflection winding. The amplifier produces a deflection current at opposite polarities, during corresponding portions of a vertical trace interval.

Abstract: A high-voltage power supply of a video display apparatus provides an ultor voltage and a focus voltage to a cathode ray tube. A low-voltage power supply provides a variable voltage to a primary winding of a flyback transformer of the high-voltage power supply. The magnitude of the variable voltage is responsive to first and second feedback signals provided by first and second negative feedback paths. The first feedback signal is derived from the ultor voltage and is used to regulate the ultor voltage. The second feedback signal is provided by the low-voltage power supply via a path that bypasses the high-voltage power supply, and is summed with the first feedback signal to ensure that the focus voltage remains at or above a predetermined minimum voltage.

Abstract: A kinescope video driver includes a series connection of a main cascode transistor coupled to a cathode of a cathode ray tube and a video signal amplifying transistor. A second cascode transistor is coupled between the main cascode transistor and the video signal amplifying transistor. The second transistor is coupled to the video signal amplifying transistor through a short wire conductor and to the main cascode transistor through a long wire conductor.

Abstract: A controller for a switch mode power supply includes an undervoltage protection circuit responsive to an input supply voltage indicative signal. The input supply voltage indicative signal is also coupled to a foldback point correction circuit. The correction circuit causes a decrease in a maximum duty cycle of a control signal when the input supply voltage increases and is still smaller than a predetermined magnitude. A zener diode limits the input supply voltage indicative signal in a manner to prevent a further decrease in the duty cycle when the input supply voltage exceeds the predetermined magnitude.

Abstract: When a given row in an array of a liquid crystal display having a toggling backplane voltage is de-selected, the row select line voltage also toggles to prevent capacitive current in the pixel capacitance. The row select line driver includes a pair of transistors coupled in a push-pull configuration. The pair of transistors are responsive to a control signal that is produced in a corresponding stage of cascaded stages of a shift register. The pair of transistors form a buffer stage that prevents the toggling voltage developed in the row select line when the row is de-selected from affecting the operation of the shift register.