KR19980068222U - Horizontal deflection device with screen size compensation - Google Patents

Abstract

The present invention relates to a horizontal deflection device having a screen size compensation function for preventing an unstable output such as deformation and distortion of a screen due to a high pressure change in a horizontal deflection device of a monitor connected to a computer system and outputting image information.

Therefore, the present invention provides a horizontal oscillation unit for generating a predetermined horizontal drive pulse, a horizontal deflection output unit for generating a horizontal deflection according to the horizontal driving pulse of the horizontal oscillation unit, a high pressure generator for generating a high voltage under the control of the horizontal deflection output unit, and a horizontal It consists of a horizontal size control unit that changes the horizontal size by adjusting the voltage of the deflection output unit, and a high pressure change detection unit that detects the high pressure change of the horizontal deflection output unit by feeding back the high pressure change amount of the high pressure generating unit to the horizontal size control unit. By inverting the inverted voltage, it is possible to suppress the unstable output such as the deformation and distortion of the screen caused by the change of the high pressure to output a stable screen.

Description

Horizontal deflection device with screen size compensation

The present invention relates to a horizontal deflection device having a screen size compensation function, and more particularly, to a horizontal deflection device of a monitor connected to a computer system and outputting image information, such as an unstable output such as distortion and distortion of a screen caused by a high pressure change. A horizontal deflection device having a prevented screen size compensation function.

In general, a monitor uses a cathode ray tube, and according to the intensity of an image signal, different amounts of electron beams strike a single color or RGB (red, green, blue) fluorescent material coated on the surface of the monitor to display different brightness or intensity. It uses the principle of producing colored light and is widely used because of its excellent price and display performance.

Such a general cathode ray tube monitor must deflect the electron beam to a desired position up, down, left and right in order to output a predetermined image or text on the screen.

Accordingly, a general monitor is essentially provided with a device for vertically and horizontally deflecting a screen according to an electron deflection method of deflecting a scanning direction of an electron beam by using a change in a magnetic field generated by passing a current.

1 is a configuration diagram of a conventional horizontal deflecting device for horizontal deflection as described above, wherein a high pressure is generated using a horizontal oscillation unit 1 for generating a predetermined horizontal driving pulse and a high pressure using a FBT (Fly Back Transformer). The part 3 is provided, respectively.

Meanwhile, a parabola wave is generated according to a horizontal driving pulse of the horizontal oscillator 1 to adjust horizontal deflection, and the parabola wave is applied to the high voltage generator 3 to generate a high voltage.

In addition, a horizontal size adjusting unit 4 which adjusts the voltage of the horizontal deflection output unit 2 to change the horizontal size of the screen is provided.

Therefore, a horizontal driving pulse is output from the horizontal oscillator 1 and is applied to the horizontal deflection output 2 to be converted into parabola waves, and the FBT of the high pressure generator 3 is switched to achieve horizontal deflection. In this case, the horizontal size of the screen is changed according to the change of the current applied by the horizontal width adjusting unit 4.

2 is a detailed circuit diagram of a horizontal drive output unit of a conventional horizontal scanning apparatus, in which the horizontal deflection output unit 2 receives a horizontal drive pulse from the horizontal oscillator 1 and performs a switching operation and a charge / discharge operation. Condenser C1, diode D1 and deflection coil H-DY, a damping capacitor C2 and C3, and a reverse voltage prevention diode D2.

The high voltage generator 3 generates a predetermined high voltage using FBT to detect a high voltage (H / V) and a high voltage change supplied to a focus voltage (FOCUS), a screen voltage (SCREEN), a cathode ray tube (not shown), and the like. A plurality of load voltages applied to the ABL (Automatic Beam Limit) stage are output.

The horizontal scale controller 4 includes resistors R1 and R2 and a variable resistor VR for varying the horizontal size by varying the power supply voltage Vcc2, transistors Q2 and Q3 for differential amplification and resistors. R3 to R6 and the voltage control transistor Q4.

Reference numeral L denotes a damping coil, and C4 denotes a discharge capacitor.

In the conventional horizontal deflection device configured as described above, a predetermined horizontal drive pulse is generated from the horizontal oscillation unit 1. At this time, the horizontal oscillator 1 is typically used an IC such as the chip number 'MC14046' or 'LA7851', such that the RC oscillation circuit (not shown) is configured to output a horizontal drive pulse having a predetermined frequency. .

The horizontal driving pulse output from the horizontal oscillation unit 1 is input to the transistor Q1 of the horizontal deflection output unit 2 and periodically turned on / off through a switching action, so that the capacitor C1 and the deflection coil H-DY. By vibrating the charging and discharging alternately, the parabola waves for horizontal deflection are output at both ends of the deflection coil (H-DY). In addition, a high voltage is generated in the FBT of the high-pressure generator 3 and supplied to a plurality of loads.

At this time, each of the diodes D1 and D2 of the horizontal deflection output unit 2 prevents the reverse voltage from being applied, and the capacitors C2 and C3 perform a buffering function of the voltage for damping.

Therefore, a constant magnetic field is generated in the deflection coil H-DY by voltage, and parabolic waves are applied to the deflection coil H-DY to change the magnetic field so as to deflect an electron beam emitted from a cathode ray tube (not shown) to display a desired image on the screen of the monitor. Output it.

In addition, it is possible to adjust the horizontal size of the image output on the monitor screen by varying the predetermined voltage to this deflection coil H-DY.

That is, when the above-described horizontal scale controller 40 varies the power supply voltage Vcc2 divided by the resistors R1 and R2 through the variable resistor VR, the voltage is converted to the transistor Q2 through the resistor R3. Is applied to the base end.

Accordingly, the amplification is compared with the reference voltage set by the resistors R5 and R6 at the base end of the transistor Q3 connected to the transistor Q2 with the differential amplifier, and the output of the differential amplified transistor Q2 is The horizontal magnitude is adjusted by applying to the base end of the control transistor Q4 and thereby controlling the voltage of the deflection coil H-DY of the horizontal deflection output unit 20 connected to the collector end.

However, such a conventional horizontal deflection device has a problem that an unstable output such as the size of the screen is deformed or distorted due to the voltage at both ends of the deflection coil is changed by the voltage applied to the deflection coil.

In addition, in addition to the high pressure generating unit, if a dedicated device for supplying a high pressure only to the deflection coil is used, it is possible to prevent such a high pressure variation to prevent the screen size from being deformed, but this has another problem in that the production cost is increased.

Therefore, the present invention is to solve the above problems, it is connected to a computer system, such as the horizontal deflection device of the monitor that outputs the image information to detect the high-pressure change amount is fed back unstable, such as deformation and distortion of the screen according to the high pressure change It is an object of the present invention to provide a horizontal deflection device having a screen size compensation function that prevents an output.

In order to achieve the above object, the present invention provides a horizontal oscillator that generates a predetermined horizontal drive pulse, a horizontal deflection output unit in which horizontal deflection is made according to the horizontal drive pulse of the horizontal oscillator, and generates a high voltage by controlling the horizontal deflection output unit. It consists of a high pressure generating unit, a horizontal size adjusting unit for varying the horizontal size by adjusting the voltage of the horizontal deflection output unit, and a high pressure fluctuation detecting unit for detecting the high pressure fluctuation of the horizontal deflection output unit by feeding back the high pressure change amount of the high pressure generating unit to the horizontal size adjusting unit. It features.

1 is a block diagram of a conventional horizontal deflection apparatus.

2 is a detailed circuit diagram of a conventional horizontal deflection apparatus.

Figure 3 is a block diagram showing an embodiment of a horizontal deflection device having a screen size compensation function to which the present invention is applied.

4 is a detailed circuit diagram of a horizontal deflection device having a screen size compensation function of the present invention.

Explanation of symbols on the main parts of the drawings

10: horizontal oscillation unit 20: horizontal deflection output unit

30: high pressure generating unit 40: horizontal size adjusting unit

50: high voltage fluctuation detection unit OP-AMP: operational amplifier

Hereinafter, an embodiment of a horizontal deflection device having a screen size compensation function to which the present invention is applied will be described with reference to the accompanying drawings.

3 is a configuration diagram showing an embodiment of a horizontal deflection device having a screen size compensation function to which the present invention is applied, a horizontal oscillation unit 10 for generating a predetermined horizontal driving pulse, and a high pressure for generating high pressure using FBT. Each of the generators 30 is provided to generate a high voltage under the control of the horizontal deflection output unit 20 and the horizontal deflection output unit 20 which receive horizontal drive pulses of the horizontal oscillation unit 10 and perform horizontal deflection. The high pressure generator 30 is provided.

In addition, a horizontal size adjusting unit 40 is provided to adjust the voltage of the above-described horizontal deflection output unit 20 to change the horizontal size, and the high pressure change amount of the high pressure generating unit 30 is changed to the horizontal size adjusting unit 40. It is composed of a high pressure fluctuation detecting unit 50 for detecting a high pressure fluctuation of the horizontal deflection output unit 20 by feedback.

4 is a detailed circuit diagram of a horizontal deflection device having a screen size compensation function according to the present invention, wherein the horizontal deflection output unit 20 receives a horizontal driving pulse from the horizontal oscillation unit 10 and performs a switching operation and charge / discharge operation. The capacitor C1, the reverse voltage prevention diode D1 and the deflection coil H-DY, the damping capacitor C2 and C3, and the voltage control diode D2 are formed.

The high voltage generator 30 generates a predetermined high voltage using FBT to detect a high voltage (H / V) and a high voltage change supplied to a focus voltage (FOCUS), a screen voltage (SCREEN), a CRT (not shown). Outputs various load voltages applied to the ABL terminal.

The horizontal size adjusting unit 40 includes a resistor R1 and a variable resistor VR for varying the horizontal size by varying the power supply voltage Vcc2, a transistor Q2 and Q3 for differential amplification, and a resistor. R3 to R6 and the output current control transistor Q4.

Reference numeral L denotes a damping coil, and C4 denotes a discharge capacitor.

In addition, the high voltage fluctuation detecting unit 50 includes an operational amplifier OP-AMP and a plurality of resistors R10 to R15 to divide the voltage change amount of the high voltage generating unit 30 into resistors R14 and R15 to invert the voltage. It inputs to the input terminal (-), and compares the reference voltage set with the resistors R11 (R13) of the non-inverting input terminal (+), and is configured to output the inverted voltage.

According to the present invention configured as described above, the transistor Q1 of the horizontal deflection output unit 20 is switched on and off periodically by the horizontal driving pulse output from the horizontal oscillator 10, and thus the capacitor C1 and the deflection coil H are periodically turned on and off. -DY) alternately charges and discharges and outputs parabola waves.

Accordingly, a predetermined load voltage is generated in the high voltage generator 30 connected through the FBT by the parabola waves of the horizontal deflection output unit 20, and the magnetic field of the deflection coil H-DY is changed to change the cathode ray tube ( The electron beam emitted from the image is deflected to output a desired image on the screen of the monitor.

Then, by applying a predetermined voltage to the above-described deflection coil (H-DY) to adjust the size of the image output on the monitor screen, that is, the horizontal size adjusting unit 40 is a resistor (R1) (R2) The voltage connected to the collector stage by varying the divided power supply voltage Vcc2 through the variable resistor VR, differentially amplifying the voltage using transistors Q2 and Q3, and applying the voltage to the base terminal of the control transistor Q4. The voltage across the deflection coil H-DY of the deflection output unit 20 is controlled to adjust the horizontal size.

On the other hand, in the process of operating as described above outputs the load voltage applied to the focus voltage (FOCUS), the screen voltage (SCREEN), the high voltage (H / V) supplied to the CRT (not shown) and the ABL terminal for detecting the high voltage change The high voltage generator 30 is a voltage fluctuation occurs by the respective output load.

In this case, the present invention detects the amount of high pressure change applied to the ABL stage by the high pressure variation detecting unit 50 and inverts the base end of the transistor Q2 of the horizontal size adjusting unit 40 so as to change the horizontal screen as much as the change. Allow size to be compensated.

In more detail, the high-voltage fluctuation detecting unit 50 divides the voltage into the resistors R14 and R15 by applying a voltage change amount of the ABL terminal to the inverting input terminal (-) of the operational amplifier OP-AMP. The reference voltage set by dividing the power supply voltage Vcc3 through the resistors R11 and R13 is input to the non-inverting input terminal + of the operational amplifier OP-AMP.

Therefore, the operational amplifier OP-AMP inverts and amplifies the voltage change amount input from each input terminal (+) (-) and the reference voltage, and then through the resistor R10, the transistor of the horizontal size adjusting unit 40. It is applied to the base end of (Q2).

Accordingly, the inverted voltage change is applied to the deflection coil H-DY of the horizontal deflection output unit 20 to be offset from the high pressure change amount of the high pressure generator 30 to obtain a stable output, thereby compensating for the horizontal screen size. will be.

In this way, the present invention is provided with a high-pressure fluctuation detector in a horizontal deflection device of a monitor that is connected to a computer system and outputs image information to detect a high-voltage change and feedback the inverted voltage, such as deformation and distortion of the screen according to the high-voltage change. It compensates for unstable output and outputs a stable horizontal screen.

Claims (3)

A horizontal oscillator for generating a predetermined horizontal drive pulse; A horizontal deflection output unit in which horizontal deflection is performed according to a horizontal driving pulse of the horizontal oscillation unit; A high pressure generator for generating a high voltage by controlling the horizontal deflection output; A horizontal size adjusting unit for changing a horizontal size by adjusting a voltage of the horizontal deflection output unit; And a high pressure variation detecting unit configured to detect a high pressure variation of the horizontal deflection output unit by feeding back the high pressure variation of the high pressure generating unit to the horizontal size adjusting unit. The horizontal deflection apparatus according to claim 1, wherein the high pressure fluctuation detecting unit inverts the amount of the high pressure change applied from the high pressure generating unit and returns it to the horizontal size adjusting unit. According to claim 1 or claim 2, wherein the high-voltage fluctuation detection unit is provided with an operational amplifier to amplify a plurality of resistors for dividing the voltage change amount of the high-voltage generator portion, and the voltage change amount divided by the plurality of resistors compared to the set reference voltage Horizontal deflection device with screen size compensation, characterized in that the output box.