KR100255774B1 - Estimation device of electromagnetic interference wave in a video display appliance - Google Patents

Abstract

PURPOSE: An apparatus for removing a spurious wave of a video displayer is provided to completely cut off spurious electric field noise generated in the front of the Braun tube by removing the spurious electric field noise without providing a unit which senses the noise. CONSTITUTION: A parabola waveform generating unit(11) generates a horizontal and a vertical parabola waveform. A vertical waveform correction unit(12) corrects a level of the horizontal waveform. A waveform coupling unit(14) loads the horizontal parabola waveform to a vertical period parabola waveform corrected. A signal amplifying unit(15) amplifies a signal of the parabola waveform combined. A gain adjustment unit(16) adjusts a gain of the signal amplified. A phase adjustment unit(17) adjusts the gain, and applies the gain to an open loop wire(18) in the front of the Braun tube(19). The open loop wire(18) reduces an electric field noise of spurious of a screen. A sensing unit(20) senses a radiation noise.

Description

Device for eliminating unnecessary radiation of image display equipment

The present invention relates to an apparatus for eliminating unnecessary radiation in an image display device (monitor, TV, LCD, etc.), in particular, by eliminating unnecessary radiation radiation generated on the front of the screen to satisfy the radio wave standard (TCO95). will be.

As shown in FIG. 1, the configuration of the unwanted radiation wave removing apparatus of the conventional video display device is

A horizontal pulse generator 1 for switching a horizontal pulse to the high voltage generator 2 by receiving a horizontal drive driving signal, and boosting the horizontal pulse generated by the horizontal pulse generator 1 to the secondary side High pressure generator (FBT) 2 for supplying the anode gap to the cathode tube 3, and resistors R1 and R2 for dividing the polarization of the reverse polarity deflection output waveform induced in the high pressure generator 2; And a waveform (R3) and a capacitor (C2) for waveform correction of the polarized deflection output waveform divided by the resistors (R1, R2) to be level adjusted by the resistors (R1, R2), and a waveform correction by the resistor (R3) and a capacitor (C2). The resistor R4 and the capacitor C3 for removing the spike noise of the reverse polarized deflection output waveform, and the resistor R1 and the capacitor are wound around the CPT by one turn (1Turn) in a closed loop. Constant voltage in reverse polarized deflection output waveform from which spike noise was removed by (C2) Was applied only to the CPT consists of a wire (L1) to remove the unnecessary radiation wave on the CPT.

Reference numeral D1 is a diode, C1, C4 is a capacitor, DY is a deflection coil, Q1 is a transistor, and the high voltage generator 2 is a coil (L2 to L9), a diode (D2 to D6), a resistor (R5-R6). It is composed of a capacitor (C _HV ) to generate a high pressure.

Referring to FIG. 1, the operation of the unnecessary radiation removing circuit in the conventional CPT configured as described above is as follows.

First, when a horizontal driving pulse is applied to the horizontal pulse generator 1, the horizontal transistor Q1 of the horizontal pulse generator 1 is turned on to switch output, and the on / off switching operation of the transistor Q1 is performed. As a result, the deflection coil DY connected to the diode D1 and the capacitor C4 generates a deflection output waveform.

On the other hand, the deflection output waveform generated in the deflection coil DY is charged and discharged by the capacitor C1, and then, on the primary side of the high voltage generator FBT 2 according to the on / off switching operation of the transistor Q1. When the coil L2 is induced, the high voltage generator 2 induces the high pressure by the internal resistors R5 and R6, the coils L3 to L9, the diodes D2 to D6, and the capacitor C _HV . It is applied to the anode gap of the CRT 3.

The deflection output waveform V of the reverse polarity (negative pulse) induced on the secondary side of the high voltage generator 2 is level-adjusted while being divided by the constant voltage B ⁺ and the resistors R1 and R2.

The reverse polarity deflection output waveform divided and level-adjusted by the resistors R1 and R2 is waveform-corrected by the resistor R3 and the capacitor C2, at which time the set value of the resistors R1 and R2 is adjusted. Therefore, the pulse and amplitude of the deflection output waveform and the DC level can be adjusted.

Accordingly, the reverse polarity deflection output waveform corrected by the resistor R3 and the capacitor C2 passes through the resistor R4 and the capacitor C3, and the waveforms are generated by the resistor R4 and the capacitor C3. The spiked noise of the corrected reverse polarized deflection output waveform is removed.

At this time, the wire L1 wound around the CPT phase (e.g., front or rear) in one rotation (1Turn) in a non-circulating state is a current in the reverse polarity deflection output waveform in which the spike noise is removed. By applying a constant voltage only to the CPT phase (eg, the front or rear) without applying the component, the unwanted radiation wave generated in the CPT phase (eg, the front or rear) is removed.

Conventionally, there is a problem that does not completely block the unnecessary radiation field noise generated in the front surface of the CRT while blocking the unnecessary radiation field noise generated without the means for detecting the unnecessary radiation field noise induced on the front surface of the CRT.

The apparatus for removing unwanted radiation of an image display device includes a parabolic waveform generator for generating parabolic waveforms of vertical and horizontal periods, a vertical and horizontal waveform correction unit for correcting the level of the generated parabolic waveforms of vertical and horizontal periods; A signal combiner configured to combine horizontal parabolic waveforms of horizontal periods on the parabolic waveforms of the corrected waveforms, to combine them, an amplifier to amplify the combined signal, and a gain adjuster to adjust the gain of the amplified signal; A phase adjuster for adjusting the phase of the gain-adjusted signal to be applied to the CRT front open loop wire, and an open loop wire for removing unnecessary radiated field noise generated on the screen by the signal applied from the phase adjuster. And a gain adjustment by detecting a voltage change of unnecessary radiated field noise by the open loop wire. By configuring the sensing unit to be applied to the unit, to remove the unnecessary radiation field noise generated on the screen, and to adjust and remove it according to the change of the unnecessary radiation field noise in the image display device due to the radiation noise in front of the screen in the human body It is to be able to solve the harmful part.

1 is a circuit diagram of an apparatus for removing unwanted radiation waves of a conventional video display device.

2 is a block diagram of an apparatus for removing unwanted radiation of an image display device of the present invention

3 is a view for showing an electric field radiated from the front portion of the image display device of the present invention;

Figure 4 is an output waveform diagram of each part of the unwanted radiation wave removal apparatus of the image display device of the present invention

As shown in FIG. 2 and FIG.

A parabolic waveform generator 11 for generating horizontal and vertical parabolic waveforms (H-PARA) (V-PARA), a horizontal waveform correction unit 12 for correcting the level of the horizontal parabola waveform, and a vertical parabolic waveform A vertical waveform correction unit 13 for correcting a level, a waveform combiner 14 for loading and combining horizontal parabolic waveforms on the corrected vertical period parabolic waveforms, and a signal amplifier for amplifying the combined parabolic waveform signal ( 15), a gain adjusting unit 16 for adjusting the gain of the amplified signal, and a phase of the gain adjusted by the gain adjusting unit 16 to adjust the phase of the gain on the CRT 19 front off-loop wire 18. An open loop wire 18 which is placed in front of the CRT tube 19 by a signal applied from the phase adjusting unit 17 and attenuates unnecessary radiated field noise of the screen, and the CRT tube ( 19) Rooms that occur around It consists of a sensing unit 20 for sensing the noise waves.

On the other hand, the horizontal waveform correction unit 12 is composed of a capacitor (C11) (C12) and a resistor (R11) for charging and discharging the input horizontal waveform to output a signal corrected to a predetermined level,

The vertical waveform correction unit 13 is composed of a capacitor (C13) (C14) and a resistor (R13) for charging and discharging the input vertical waveform to output a signal corrected to a predetermined level,

The waveform combiner 14 includes a combiner OP1 that couples the vertical and horizontal parabola waveforms with the gains of the resistors R12 and R14.

On the other hand, the signal amplifier 15 cascades the transistor Q11 for inverting and amplifying the input parabola waveform to the base of the transistor Q12 and the parabola waveform inverted and amplified by the transistor Q11. Transistors Q12 and Q13 that are amplified and applied to the base of the transistor Q14 and the cascode amplified signal are applied to the flyback transformer FBT and the gain adjusting unit through the voltage drop of the emitter resistor R22. It consists of a transistor Q14 applied to 16.

Reference symbols R12 and R14-R21 are resistors, C15 and C16 are capacitors, D11-D14 are diodes, ZD11 and ZD12 are zener diodes, SG1 is a spark gap, and B1 ⁺ and B2 ⁺ are power supply voltages.

The unnecessary radiation field noise removing device of the front portion of the image display device of the present invention configured as described above will be described with reference to FIGS. 2 to 4.

First, when the horizontal parabola waveform H-PARA of the horizontal period _H is generated at the predetermined level V _H as shown in FIG. 4A in the waveform generator 11, the generated horizontal parabola waveform is The horizontal parabolic waveforms that are charged and discharged by the capacitors C11, C12 and the resistor R11 of the horizontal waveform correction unit 12 are corrected and applied through the resistor R12 of the waveform combiner 14.

When the vertical parabolic waveform V-PARA of the vertical period _V is generated at the predetermined level V _V as shown in FIG. 4B in the waveform generator 11, the generated vertical parabola waveform is The vertical parabolic waveforms charged and discharged by the capacitors C13 and C14 and the resistor R12 of the horizontal waveform compensator 12 are applied to the negative terminal (-) of the combiner OP1 of the waveform combiner 14. do.

)으로 하여 결합기(OP1)의 부단자(-)에 인가된 수직 주기의 파라볼라 파형 위에 수평주기의 파라볼라 파형을 실어 주게 되므로, 도 4의 (C)와 같은 수직주기 위에 수평 주기가 결합된 파라볼라 파형(V_H×N,V_V×N)이 생성되고, 상기 생성된 파라볼라 파형은 신호 증폭부(15)에 인가된다.The waveform coupler 14 has a gain (AV =) due to the ratio of the resistor R12 and the resistor R14.

Since the parabola waveform of the horizontal period is placed on the parabolic waveform of the vertical period applied to the sub-terminal (-) of the combiner (OP1) as a), the parabolic waveform in which the horizontal period is combined on the vertical period as shown in FIG. (V _H × N, V _V × N) are generated, and the generated parabola waveform is applied to the signal amplifier 15.

The signal amplifier 15 converts the parabola waveform input by the transistor Q11 into a waveform as shown in FIG. 4D (N times the waveform in FIG. 4) (V _HC × N, V _VC × N). The inverted and amplified signal is clipped to a predetermined level in the zener diode ZD11 and the capacitor C16 and applied to the base of the transistor Q13.

The signal applied to the base of the transistor Q13 is inverted and amplified by a cascade coupled transistor Q12 and Q13 into a waveform as shown in FIG. 4E at a predetermined amplification rate.

The inverted and amplified signal passes through a voltage drop across the resistor R22 connected to the emitter terminal of the transistor Q14, and the flyback transformer FBT and the gain adjusting unit 16 have a waveform as shown in FIG. Is approved.

로 조절한다.Here, the gain AV of the signal applied to the gain adjusting unit 16 is adjusted by the ratio of the resistors R15 and R18 and R19 of the signal amplifier 15. That is, the gain AV is

Adjust with

The gain adjusting unit 16 adjusts the applied signal to the CRT front emission ripple voltage level, and the adjusted signal is applied to the phase adjusting unit 17 in a waveform as shown in FIG.

Here, the waveform as shown in (G) of FIG. 4 is AC-coupled and outputs the voltage level as much as 1 / N times the CRT front emission noise level in the waveform of FIG.

The phase adjuster 17 synchronizes the ripple voltage of the vertical period and couples and removes the instantaneous peak pulse voltage by a capacitor therein.

By coupling as described above to remove the instantaneous peak pulse voltage, the front ripple voltage as shown in Figure 4 (H) generated in front of the CRT tube 19 as shown in Figure 3 and (I) of Figure 4 By applying the negative voltage of the same waveform to the open loop wire 18, it has the ground (GND) terminal potential as shown in FIG. 4J, thereby eliminating unnecessary radiated field noise.

Then, the sensing unit 20 connected to the open loop wire 18 detects the pattern change or the load change generated on the screen and feeds it back to the gain adjusting unit 16 to adjust the voltage change level using the sensed level. According to the voltage change level, the phase adjuster 17 applies a negative pulse level to the open loop wire 18 to remove unnecessary radiated field noise.

According to the present invention, it is possible to eliminate the harmful part of the human body due to the noise emitted from the front of the screen in the image display device, satisfy the radio wave standard (TCO95), and reduce the cost compared to the current flyback sub pulse. A horizontal period is applied to the antenna to completely eliminate unnecessary radiated field noise through gain and phase adjustment, giving users the reliability of the product.

Claims (2)

Parabolic waveform generating unit 11 for generating horizontal and vertical parabola waveforms, horizontal waveform correcting unit 12 for correcting the level of the horizontal parabola waveform, and vertical waveform correcting unit 13 for correcting the level of the vertical parabola waveform ), A signal combiner 14 for combining the corrected vertical synchronizing parabola waveform and a horizontal parabola waveform having a horizontal period, a signal amplifier 15 for amplifying the combined parabola waveform, and the signal amplifier ( A gain controller 16 for adjusting the gain of the amplified signal 15 and a signal sensed by the off-loop wire 18 in the detector 20, and a phase of a signal applied from the gain controller 16; An open loop for removing unnecessary radiated field noise generated on the front surface of the CRT using a phase adjusting unit 17 to be adjusted and applied to the open loop wire 18 and a signal applied from the phase adjusting unit 17. wire And a detector 20 for detecting a change in voltage level from the open loop wire 18 and applying it to the gain adjuster 16. The signal combiner 14 of claim 1, wherein the signal combiner 14 comprises a combiner OP1 for coupling a horizontal parabolic waveform of a horizontal period to a gain according to a ratio of a resistor R12 and a resistor R14 on a parabolic waveform of a vertical period. , The signal amplifier 14 includes a transistor Q11 for inverting and amplifying the combined parabola waveform, a transistor Q12 and Q13 for cascode amplifying the inverted and amplified signal of the transistor Q11, and the cascode amplification. And a transistor (Q14) for applying the received signal through the voltage drop resistor (R22) of the emitter.

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