KR0160236B1 - Picture distortion correction apparatus in image displayer - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to screen distortion correction of monitors and TVs. In the related art, local distortion correction of upper and lower corners of screens such as monitors and TVs is amplified by amplifying vertical parabola waveforms which are symmetrically applied to a deflection correction circuit. Since it is impossible to correct the distortion caused by the recent increase in size and flatness of monitors and TVs, there is a problem in that high quality products cannot be made.

Therefore, the present invention is to solve the above problems by applying a distortion correction waveform having a separate gain in the state of dividing each corner of the screen, such as a monitor and TV, monitors and TVs according to the size and planarization It is possible to correct the upper and lower corner distortion of the screen partially generated on the screen, so that any distortion correction of the screen can be performed, and it is a screen upper and lower corner distortion correction device of the image display device that can make a high quality product.

Description

Upper and lower corner distortion correction device of image display device

1 is a block diagram of a screen distortion correction apparatus of a conventional video display device.

Figure 2 (a) is a conventional vertical sync signal waveform diagram.

(b) is a signal waveform diagram output from a conventional parabolic oscillator.

(c) (d) is a front view of a conventional screen distortion corrected.

3 is a block circuit diagram showing the configuration of the upper and lower corner distortion correction device of the image display device of the present invention.

4A is a vertical synchronization signal waveform diagram of the present invention.

(b)-(e) is an output waveform diagram of each part of the upper and lower corner distortion correction apparatus of the image display device of the present invention.

(A)-(c) of FIG. 5 are front views in which upper and lower corner distortions of the screen of the image display device of the present invention are corrected.

* Explanation of symbols for main parts of the drawings

11: parabola 12: clipper section

13: differential amplifier 14: timer

15: switching unit 16: amplifying unit

17 Emitter Follower SW: Switch

P1: Upper DC regulated voltage terminal P2: Lower DC regulated voltage terminal

P3: Upper and Lower DC Regulated Voltage Terminal

The present invention relates to screen distortion correction of monitors and TVs, and in particular, by constructing a circuit to apply a distortion correction waveform having a separate gain in the state of dividing each corner of the CRT screen, making it larger and planarized. The upper and lower corner distortion correction apparatus of the image display device to correct the upper and lower corner distortion of the screen partially generated on the screen of the CRT.

The configuration and operation of a screen distortion correction apparatus of a conventional image display device will be described with reference to FIG. 1 as follows.

First, a parabolic oscillator 1 oscillates according to an input vertical synchronization signal and outputs a vertical parabola waveform, and an amplifier 2 amplifies and outputs a vertical parabola waveform oscillated and output from the parabola oscillator 1. .

Reference numerals R1 and R2 denote resistors, and VR1 denotes semi-fixed resistors.

The operation of the screen distortion correction apparatus of the conventional video display device configured as described above will be described below.

When the vertical synchronous signal as shown in FIG. 2A is input to the parabolic oscillator 1, the parabolic oscillator 1 is oscillated in synchronization with the input vertical synchronous signal to generate the vertical synchronous signal as shown in FIG. The parabola waveform is output to the negative terminal (-) of the amplifier 2 through the resistor R1.

At this time, while the reference potential is input to the positive terminal (+) of the amplifier 2, the drawing according to a predetermined ratio of the resistor (R1) (R2) and the semi-fixed resistor (VR1) connected to the amplifier (2) As shown in (b) of FIG. 2, if the gain of the constant voltage (V1) (V2) is amplified so that the vertical parabola waveform is output to the deflection correction circuit, it is shown in (c) (d) of FIG. As described above, screen correction of a monitor and a TV is performed.

However, the conventional screen distortion correction apparatus of the video display device amplifies the vertical parabola waveform symmetrically and applies it to the deflection correction circuit, so that local distortion correction of the upper and lower corners of the screen such as a monitor and a TV cannot be performed. Distortion correction due to the large size and flattening of the TV is not possible, and thus there is a problem in that a high quality product cannot be made.

Therefore, in order to solve the problem, the present invention enables to apply a distortion correction waveform having a separate gain while dividing each corner of a screen corner such as a monitor and a TV. Partial audio on the screen allows the top and bottom corner distortion of the screen to be corrected so that any distortion of the screen can be corrected to create a high quality product.

The configuration and operation of the upper and lower corner distortion correction apparatus of the image display device of the present invention for achieving the above object will be described with reference to FIG. 3.

First, a parabolic oscillator 11 oscillating according to an input vertical synchronization signal to output a vertical parabola waveform, and a clipper unit 12 for removing a predetermined portion of a vertical parabola waveform output from the parabola oscillator 11 And a differential amplifier 13 for differentially amplifying and outputting a vertical parabola waveform from which a predetermined portion is removed by the clipper unit 12, and a time constant of the resistor R15 and the contender C12 when a vertical synchronous signal is input. The upper and lower and upper and lower DC regulated voltage stages P1 and P2 of the screens according to the signal level of the constant pulse waveform output from the timer unit 14 and the timer unit 14 for outputting a constant pulse waveform. A switching unit 15 for adjusting the amplification degree of the amplifying unit 16 by switching to select a DC regulation voltage applied to P3, and respective upper and lower portions selected according to the switching operation of the switching unit 15; Upper and lower direct current An amplifier 16 for amplifying and outputting a constant pulse waveform by the amplification degree adjusted according to the adjustment voltage stages P1, P2, and P3; and a vertical parabola waveform differentially amplified and output from the differential amplifier 13; An emitter follower 17 is configured to output a vertical parabola waveform corrected to correct distortion of upper and lower corner portions of the screen as a predetermined pulse waveform output from the amplifier 16 is input.

The clipper part 12 has a resistor R11 (R12) for dividing the constant power supply (+ B) and a capacitor for smoothing the constant power supply (+ B) divided by the resistors (R11) (R12). (C11) and a diode (D11) for clipping the lower portion of the vertical parabola waveform oscillated and output from the parabolic oscillator (11) according to the constant power (+ B) smoothed by the condenser (C11), the differential The amplifier 13 includes the transistors Q1, Q2 and Q3 having the differential amplifiers formed thereon, and the transistors of which the resistors R23 and R24 form the differential amplifiers to apply a bias of a constant power supply (+ B). A resistor R25, a Zener diode ZD1, and a resistor R27 are connected to a base of the transistors Q2 and Q3, which are divided and connected to the base of Q1, and form a differential amplifier. A bias of + B is applied, and resistors R13 and R14 are connected to the emitter and the collector of the transistors Q1 and Q2. The amplification degree of the differential amplifier is determined, and a resistor R26 and a capacitor C14 are connected in parallel to the bases of the transistors Q2 and Q3.

In addition, the switching unit 15 performs a switching operation to select the DC regulation voltage applied to the upper and lower DC regulation voltage terminals P1 and P2 according to the signal level of the constant pulse waveform output from the timer unit 14. The amplification degree according to the change of the DC adjustment voltage applied to the switch SW and the upper and lower DC regulated voltage terminals P1 and P2 selected according to the switching operation of the switch SW is determined to have a constant pulse waveform. A predetermined pulse waveform vertical is determined by determining the amplification degree according to the change of the DC regulating voltage applied to the resistors R16, R17, and R19 configured to change the vertical half-period DC component and the upper and lower DC regulating voltage terminals P3. The resistor R18 is connected to the resistor R19 to change the upper and lower direct current components, and the emitter follower 17 is configured to connect the resistors R20 and R21 connected to the base and the emitter of the transistor Q4. It is made up of.

Reference numerals R22 and R28 denote resistors and C13 denotes a capacitor.

The operation of the upper and lower corner distortion correction apparatus of the screen of the present invention configured as described above will be described below.

First, when a vertical synchronizing signal is input to the parabola oscillator 11 as shown in FIG. 4A, the parabola oscillator 11 resists the vertical parabola waveform which is oscillated in synchronization with the input vertical synchronizing signal. Output via (R22).

At this time, the vertical parabola waveform output from the parabolic oscillator 11 is removed by the clipper unit 12 as shown in FIG.

That is, when the constant power supply (+ B) input by the resistors R11 and R12 configured in the clipper portion 12 is divided and smoothed by the capacitor C11, the smoothed constant power supply (+ B) is performed. In the diode D11 configured in the clipper part 12, the lower portion of the vertical parabola waveform output from the parabolic oscillator 11 is removed.

The vertical parabolic waveform from which the lower part is removed is smoothed by the capacitor C13 and input to the differential amplifier 13, and the transistors Q1 and Q2 configured to the differential amplifier 13 to form a differential amplifier. The divided resistors R23 and R24 and the resistor R25 and the Zener diode ZD1 and the resistor R27 are connected to the base of the Q3, so that the bases of the transistors Q1, Q2 and Q3 are connected to the base of the transistors Q1, Q2 and Q3. A bias of a constant power supply (+ B) is applied.

Accordingly, the differential amplifier 13 differentially amplifies the input vertical parabola waveform by removing the lower portion according to the bias of the constant power supply (+ B) applied to the bases of the transistors Q1, Q2, and Q3. Through the resistor R20 configured in the follower 17, the output is output to the base of the transistor Q4.

Here, the amplification degree of the differential amplifier 13 is determined by the resistors R14 and R13 connected to the emitter and the collector of the transistors Q1 and Q2, and the resistors are provided at the base of the transistors Q2 and Q3. The R26 and the capacitor C14 are connected in parallel to feed back a constant voltage (+ B) of direct current and alternating current.

On the other hand, when the vertical synchronization signal as shown in (a) of FIG. 4 is input to the timer unit 14, the timer unit 14 corrects the resistor R15 and the capacitor C12 connected to the constant power source (+ B). According to the number, a constant pulse waveform as shown in (b) of FIG. 4 is outputted to the switch SW configured in the switching unit 15, and the upper and lower DC regulation voltages to which a DC regulation voltage is applied in the switch SW. By performing a switching operation to select stages P1 and P2, the timer unit 14 is changed by the change of the DC regulation voltage flowing in each of the switched and selected upper and lower DC regulation voltage stages P1 and P2. The constant pulse waveform outputted from) changes while being input to the negative terminal (-) of the amplifier 16.

That is, the resistors R16 and R17 connected to the upper and lower DC regulated voltage terminals P1 and P2 selected by the switching of the switch SW and the resistor R17 fed back from the amplifier 16 are provided. By this, the amplification degree of the amplifier 16 is determined.

Accordingly, as the amplification degree of the amplifying unit 16 is determined, a predetermined pulse waveform of a high or low signal level amplified by the amplifying unit 16 is applied to each of the upper and lower DC voltage adjusting stages P1 and P2. According to the change of the applied DC adjustment voltage, the half-cycle DC voltage of the upper and lower portions of the constant pulse waveform is adjusted as shown in FIG.

At this time. When a change in the DC regulation voltage is applied to the upper and lower DC regulation voltage terminals P3 configured in the switching unit 15, the one-cycle DC voltage of the constant pulse waveform output from the timer unit 14 is shown in FIG. is adjusted as in (b).

Therefore, as shown in (b) of FIG. 4, the upper and lower and upper and lower direct current regulating voltage stages P1, P2, and P3 configured in the switching unit 15 are changed and applied as shown in FIG. The constant pulse waveform in which the DC voltage is adjusted for half and one cycle is amplified by the amplifier 16 and input to the emitter follower 17 through the resistor R23.

Accordingly, in the emitter follower 17 including the resistors R20 and R21 and the transistor Q4, a vertical parabola waveform as shown in (d) of FIG. 4 which is differentially amplified and output by the differential amplifier 13 is output. By associating a constant pulse waveform as shown in (c) of FIG. 4 as amplified by the amplifying unit 16 and outputting the same, the vertical parabola waveform having the amplification degree as shown in (e) of FIG. 4 is outputted to the deflection correction circuit. do.

That is, as shown in (a) (b) (c) of FIG. 5 according to the vertical parabola waveform outputted by changing the amplification degree in the emitter follower 17, while locally adjusting the corner portions of the screen, The distortion of the upper and lower corners of the screen can be corrected.

As described above, the present invention allows to apply a distortion correction waveform having a separate gain while dividing each corner of a screen corner such as a monitor and a TV. It is possible to correct any distortion of the upper and lower corners of the generated screen, so that any distortion of the screen can be corrected, thereby producing a high quality product.

Claims (4)

A parabolic oscillator 11 oscillating according to an input vertical synchronization signal to output a vertical parabola waveform, a clipper unit 12 removing a predetermined portion of the vertical parabola waveform output from the parabola oscillator 11, The differential amplifier 13 differentially outputs the vertical parabola waveform from which the predetermined portion is removed by the clipper unit 12, and when the vertical synchronization signal is input, according to the time constants of the resistor R15 and the contender C12. Timer unit 4 for outputting a constant pulse waveform, and the upper and lower and upper and lower direct current adjustment voltage stages P1, P2, and P3 of the screen according to the signal level of the constant pulse waveform output from the timer unit 14, respectively. Switching unit 15 for adjusting the amplification degree of the amplifying unit 16 by switching to select a DC control voltage applied to the), and each of the upper and lower and upper and lower direct current selected according to the switching operation of the switching unit 15 Before adjustment An amplifier 16 for amplifying and outputting a constant pulse waveform by the amplification degree adjusted according to the pressing stages P1, P2, and P3; and a vertical parabola waveform differentially amplified and output from the differential amplifier 13 and the amplifier. Of an image display device comprising an emitter follower (17) for outputting a vertical parabola waveform corrected to correct distortion of upper and lower corner portions of the screen as a constant pulse waveform output from (16) is inputted. Upper and lower corner distortion correction device. 2. The clipper section 12 smoothes the resistors R11 and R12 for dividing the constant power source + B and the constant power source + B divided by the resistors R11 and R12. And a diode D11 to clip the lower portion of the vertical parabola waveform oscillated by the parabolic oscillator 11 according to a constant power source (+ B) smoothed by the capacitor C11. Upper and lower corner distortion correction apparatus of the image display apparatus. 2. The differential amplifier (13) according to claim 1, wherein the differential amplifier (13) is provided with resistors (R23) and (R24) so as to apply a bias of transistors (Q1) (Q2) (Q3) and a constant power supply (+ B) in which the differential amplifier is formed. It is divided into a base of the transistor Q1 that forms the differential amplifier, and is connected. The base of the transistors Q2 and Q3 that form the differential amplifier includes a resistor R25, a zener diode ZD1, and a resistor R27. The connection is configured to apply a bias of the constant power supply (+ B), and the resistors R14 and R13 are connected to the emitters and collectors of the transistors Q1 and Q2 to determine the amplification degree of the differential amplifier, A top and bottom corner distortion correction device of a video display device, characterized in that a resistor (R26) and a capacitor (C14) are connected and connected to the base of Q2) (Q3). The switching unit (15) according to claim 1, wherein the switching unit (15) selects the DC regulation voltages applied to the upper and lower DC regulation voltage stages (P1) and (P2) according to the signal level of the constant pulse waveform output from the timer unit (14). The switching SW and the amplification degree according to the change of the DC regulating voltage applied to the upper and lower DC regulating voltage stages P1 and P2 which are selected according to the switching operation of the switch SW and the switching SW are determined. A predetermined pulse is determined by determining the amplification degree according to the change of the DC regulating voltage applied to the resistors R16, R17, and R19 configured to change the vertical half-period direct current of the pulse waveform, and the upper and lower DC regulating voltage terminals P3. The upper and lower corner distortion correction apparatus of the image display device, characterized in that consisting of a resistor (R18) connected to the resistor (R19) to change the vertical upper and lower direct current portion of the waveform.