KR100284183B1 - Device and method for automatic focus and screen voltage adjustment using on screen display (OSD) - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for automatically adjusting focus and screen voltage using an on screen display (OSD), and in particular, an on-screen display (OSD) menu on a screen of an image display device. The present invention relates to an apparatus and method for automatically adjusting focus and screen voltage so as to be implemented by adjusting.

In the related art, producers have to manually adjust the variable resistor to adjust the focus and screen voltage.

In the present invention, a voltage divider is provided in the flyback transformer instead of a variable resistor to divide the high voltage generated at the secondary side of the flyback transformer to a predetermined level through the voltage divider resistor to supply the focus and the screen voltage while adjusting the focus and the screen voltage. Is implemented as an OSD menu on the screen of the video display device so that the user can see the level control display status of the OSD menu and select the level increase button or the level decrease button to automatically adjust the focus and the screen voltage, thereby providing convenience to the producer and the user. It is to provide.

Description

An apparatus and method for automatically adjusting focus and screen voltage using an on-screen display (OSD)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for automatically adjusting focus and screen voltage using an on screen display (OSD), and in particular, an on-screen display (OSD) menu on a screen of an image display device. The present invention relates to an apparatus and method for automatically adjusting focus and screen voltage so that a user may view a level control display state of an OSD menu and select a level increase button or a level decrease button to adjust focus and screen voltage.

1 is a block diagram illustrating an internal configuration of a conventional flyback transformer (FBT) and a peripheral circuit. The horizontal output circuit 10 outputs a flyback pulse generated in a return period of a horizontal deflection current to a flyback transformer (FBT), The variable resistor VR1 boosts the flyback pulse input from the horizontal output circuit 10 and rectifies it to a high voltage and supplies it to the anode of the CRT, and divides the high voltage supplied to the anode to output the focus and the screen voltage. It consists of FBT with (VR3).

Reference numeral 20 is an ABL (Auto Beam Limit) circuit, 30 is a dynamic focus waveform generating circuit, Q1 is a horizontal output transistor, D1 is a damper diode, Hdy is a horizontal deflection coil, and Cs is an S-shaped correction capacitor.

The operation of the conventional flyback transformer FBT configured as described above will be described with reference to FIG. 1. First, in the flyback transformer FBT, when the flyback pulse is applied from the horizontal output circuit 10 to the primary side, It generates a high pressure, rectifies it, and outputs it to the anode of the CRT.

On the other hand, the high voltage rectified on the secondary side of the flyback transformer (FBT) is divided by the variable resistors VR1, VR2 and VR3 and supplied to the dynamic focus, the static focus and the screen voltage G2. do.

At this time, the focus and the screen voltage is adjusted by varying the resistance values of the variable resistors VR1, VR2, and VR3. The variable resistors VR1, VR2, and VR3 can be manually adjusted only by the producer.

Recently, however, all adjustments are being made mainly by software automation due to automation of production facilities. In the related art, producers have to manually adjust the variable resistors VR1, VR2, and VR3 to adjust focus and screen voltage as described above. There was discomfort.

In the present invention, a voltage divider is provided in the flyback transformer instead of a variable resistor to divide the high voltage generated at the secondary side of the flyback transformer to a predetermined level through the voltage divider resistor to supply the focus and the screen voltage while adjusting the focus and the screen voltage. Is implemented as an OSD menu on the screen of the video display device so that the user can see the level control display status of the OSD menu and select the level increase button or the level decrease button to automatically adjust the focus and the screen voltage, thereby providing convenience to the producer and the user. It is to provide.

1 is a block diagram of an internal configuration and a peripheral circuit of a conventional flyback transformer

2 is a configuration of the focus and screen voltage automatic adjustment device using the present invention On Screen Display (OSD)

3 is a flowchart illustrating a focus and screen voltage adjustment process using the present invention On Screen Display (OSD).

According to an embodiment of the present invention, an apparatus for automatically adjusting focus and screen voltage using an on-screen display (OSD) is configured to output a flyback pulse generated during a return period of a horizontal deflection current to a flyback transformer (FBT), as shown in FIG. 2. The output circuit 10 and the flyback pulse input from the horizontal output circuit 10 are boosted, rectified and supplied to the anode of the CRT, and provided with a plurality of voltage divider resistors R1 to R6. A flyback transformer (FBT) for dividing the high voltage supplied to the anode and outputting it as a focus and screen voltage, and when a focus and screen voltage adjustment control signal is applied from a key input means (not shown) by the user, the OSD screen is displayed. The microcomputer 40 performs control so as to be implemented, and outputs a pulse voltage PWM corresponding to the level adjusted by the level control button of the key input means, and the control of the microcomputer 40. OSD IC 50 for implementing the OSD menu on the screen of the image display device, and the control means 60 for adjusting the focus and the screen voltage level according to the pulse voltage level output from the microcomputer 40 do.

Meanwhile, the adjusting means 60 buffers the transistors Q1, Q2 and Q3 for converting the pulse voltage output from the microcomputer 40 into DC voltages, and the DC voltages output from the transistors Q1, Q2 and Q3. Output amplifiers OP1, OP2, and OP3, and transistors Q4, Q5, and Q6 for controlling the focus and screen voltage levels according to the DC voltage levels inputted from the operational amplifiers OP1, OP2, and OP3. .

Reference numeral 20 is an ABL (Auto Beam Limit) circuit, 30 is a dynamic focus waveform generating circuit, Q1 is a horizontal output transistor, D1 is a damper diode, Hdy is a horizontal deflection coil, Cs is an S-shaped correction capacitor, and C1 to C3 is a capacitor. , R10 to R15 are resistors.

3 is a flowchart illustrating a focus and screen voltage adjustment process using the present invention On Screen Display (OSD) implemented by the above configuration.

A first step of implementing an OSD menu on the screen when a focus and screen voltage adjustment control signal is applied from the key input means, a second step of generating a pulse voltage equal to the level adjusted by the level adjustment button, and the pulse The third process is to adjust the focus and screen voltage levels according to the voltage level.

An embodiment of an apparatus and method for automatically adjusting focus and screen voltage using the present invention On Screen Display (OSD) configured as described above will be described with reference to the accompanying drawings.

First, when the flyback transformer FBT is applied from the horizontal output circuit 10 to the primary side, the flyback transformer FBT generates a high pressure at the secondary side and rectifies it to output the anode to the cathode of the CRT.

On the other hand, the high voltage generated at the secondary side is divided to a predetermined level through the voltage divider R1 to R6 and supplied to the dynamic focus, the static focus, and the screen voltage G2.

At this time, if a focus and screen voltage adjustment control signal is input from the key input means (not shown) to the microcomputer 40 by the user, the microcomputer 40 drives the OSD IC 50 to display the screen of the image display device. The OSD menu is displayed on the screen.

The user views the OSD menu displayed on the screen, selects the level increase button or the level decrease button of the key input means, adjusts the focus and screen voltage appropriately, and then presses the completion button. Output PWM (Pulse Width Modulation).

The pulse voltage PWM is input to the base terminals of the transistors Q1, Q2, and Q3 through the resistors F10, R11, and R12, and the base terminal of the collector terminals of the transistors Q1, Q2, and Q3. The DC voltage is generated by the pulse voltage level, and the DC voltage is input to the base terminals of the transistors Q4, Q5, and Q6 through the operational amplifiers OP1, OP2, and OP3.

At this time, the focus and screen voltage levels are controlled according to the voltage level input to the base terminals of the transistors Q4, Q5 and Q6.

As an example, it is assumed that the high voltage output to the anode of the CRT on the secondary side of the FBT is 24 kV, the resistors R1, R2, and R7 are 300, 100, and 10 mA, respectively, and the base voltage of the transistor Q4 is initially set to 300 V.

At this time, the dynamic focus current flowing through the resistor R1 becomes 59.25 mA.

Therefore, the dynamic focus output voltage is 24 kV-(300 kW x 59.25 kV) = 6.225 kV.

In the above state, in order to lower the dynamic focus voltage (6.225 kV) by 200 V, the producer or the user of the product selects the level decrease button of the key input means to lower the level by a predetermined level.

Then, the microcomputer 40 generates the pulse voltage PWM by the reduced level so as to control the base voltage of the transistor Q4 to be about 0V.

At this time, the dynamic focus current flowing through the resistor R1 is 60 mA.

Therefore, the dynamic focus voltage is 24 kV-(300 kW x 60 kV) = 6.0 kV.

In order to increase the dynamic focus voltage (6.225 kV) to 200 V, the producer or the user of the product selects the level increase button of the key input means to increase the level by a predetermined level.

Then, the microcomputer 40 generates the pulse voltage PWM by the increased level to control the base voltage of the transistor Q4 to be about 600V.

At this time, the dynamic focus current flowing through the resistor R1 becomes 58.5 mA.

Therefore, the dynamic focus voltage is 24 kV- (300 kW x 58.5 kW) = 6.45 kW.

As described above, the focus and screen voltage levels may be adjusted by using a current control method instead of the voltage control method of the transistors Q4, Q5, and Q6.

As described above, in the present invention, it is possible to reduce component defect rate by using a voltage divider resistor instead of a variable resistor having many defects inside the flyback transformer, and to adjust the focus and screen voltage automatically, thereby increasing the productivity of the product. The user can adjust the focus deviation according to the various frequency characteristics of the PC, which has the effect of realizing an optimal screen.

Claims (3)

A flyback transformer for boosting the flyback pulse applied from the horizontal output circuit and rectifying it to a high voltage and supplying it to the anode of the CRT. , A microcomputer for controlling the OSD screen to be implemented when a focus and screen voltage adjustment control signal is applied from the key input means by the user, and outputting a pulse voltage equal to the level adjusted by the level adjustment button of the key input means; An OSD IC for implementing an OSD menu on a screen of an image display device under the control of the microcomputer; Adjusting means for adjusting the focus and the screen voltage level in accordance with the pulse voltage level output from the microcomputer, Focus and screen voltage automatic adjustment device using an on-screen display (OSD), characterized in that configured to include. The method of claim 1, wherein the adjusting means includes a voltage converter for converting a pulse voltage output from the microcomputer to a direct current voltage, an operational amplifier for buffering the direct current voltage output to the voltage converter, and an output from the operational amplifier. An apparatus for automatically adjusting focus and screen voltage using an on-screen display (OSD), comprising a level control unit for controlling focus and screen voltage levels according to voltage levels. A first step of implementing an OSD menu on the screen when a focus and screen voltage adjustment control signal is applied from the key input means, a second step of generating a pulse voltage equal to the level adjusted by the level adjustment button, and the pulse A method of automatically adjusting focus and screen voltage using an on-screen display (OSD), characterized in that the third step of adjusting the focus and screen voltage level according to the voltage level.