KR0157285B1 - Signal generating circuit and adjusting method for image display device using the same - Google Patents

Abstract

The present invention provides a pseudo composite video signal generation circuit which is easy to adjust around a water pipe and the like, and can simplify the final manufacturing process and subsequent adjustments.

A three-state signal V _OUT based on the horizontal and vertical synchronizing signals according to the synchronizing signal generating unit for generating horizontal and vertical synchronizing signals, the display setting unit for setting the display form of the image, and the display type set by the display setting unit. A pseudo composite video signal generation circuit 17a having a signal generator for generating a pseudo composite video signal generation circuit 17a is built in the microcomputer 17, and the microcomputer 17 pseudo-composite V _OUT . It is connected to a waveform shaping circuit 37 for waveform shaping to a video signal, and this microcomputer is also incorporated in an image display device.

Description

Signal generation circuit and adjusting method of image display device using the same

1 is a block diagram showing the main components of a television receiver according to an embodiment of the present invention.

FIG. 2 shows an example of the waveform shaping circuit 37 of FIG.

FIG. 3 (a) is an example of the timing chart at the time of forming a pseudo composite video signal using a waveform shaping circuit, and FIG. 3 (b) is an image diagram on a display screen corresponding thereto.

4 is a block diagram showing the internal structure of the pseudo composite video signal generation circuit shown in FIG.

5 is a schematic system block diagram of the microcomputer 17, and the display of the system control circuit, the interrupt control circuit and the like is omitted for simplicity.

6 shows screen display examples of various composite video signals.

* Explanation of symbols for main parts of the drawings

1: color award tube 2: electron gun

3: color purified magnet 4: positive convergence magnet

5: deflection yoke 6: shadow mask

7: phosphor 11: R drive circuit

12: G drive circuit 13: B drive circuit

14: R cutoff drive control circuit 15: G cutoff drive control circuit

16: B cutoff drive control circuit 17: microcomputer

17a: pseudo composite video signal generation circuit

18: screen adjustment circuit 21: basic clock generator

22: horizontal cycle counter 23: vertical cycle counter

24: horizontal position decoder 25: vertical position decoder

27: signal generator 28: display setting unit

37: waveform shaping circuit 38: video amplifier circuit

39: deflection circuit 41: color signal reproduction circuit

42: program memory (ROM) 43: data bus

200: synchronization signal generator HDV: pseudo horizontal synchronization signal

VDV: Pseudo Vertical Sync Signal S11, S12: Various Timing Signals

VOUT: 3 state signal SQCV: Pseudo composite video signal

Hz: High Impedance HD: Horizontal Sync Pulse

The present invention is a composite video for testing necessary for adjusting the white balance of the display screen of the receiving tube, adjusting the distortion and amplitude of the image, and confirming the image, which is carried out in the final manufacturing process of the image display apparatus such as a television (TV) receiver. The present invention relates to a pseudo composite video signal generating circuit for generating a pseudo signal and a method of adjusting an image display device using the same.

In recent years, with the increase in the size and quality of image display devices such as television receivers, computers, and displays of various measuring instruments, the size of a water pipe has increased, and along with that, adjustment of the periphery of a water pipe (brown tube) has become important. As an example of a television receiver as an adjustment of the periphery of the receiving tube, for example, a signal generator installed outside the television receiver manufactured in the final manufacturing process receives a composite video signal for testing and adjusts the white balance of the TV screen and the color purity adjustment (PC, for example). Adjustment), convergence adjustment, deflection distortion of pixels, adjustment of amplitude, confirmation, and the like.

As described above, in the related art, since an external signal generator is used to adjust the periphery of the water pipe and the like, the finished manufacturing process is complicated, and a lot of time is required for the adjustment and the cost is high. In addition, there is a problem in that wiring work with the external signal generator and subsequent adjustment work are complicated when adjusting the peripheral part of the water pipe and the like during the maintenance work of the television receiver.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above, and an object thereof is to facilitate adjustment of the periphery of the water pipe of an image display device such as a television receiver, and to simplify the completed manufacturing process. A pseudo composite video signal generation circuit capable of reducing time and cost in a manufacturing process and a method of adjusting an image display device using the same are provided.

Another object of the present invention is to provide a pseudo-composite video signal generating circuit and a method of adjusting an image display device using the same, which are easy to adjust the periphery of a water pipe of an image display device such as a television receiver, and can make maintenance work more efficient. have.

In order to achieve the above object, a first feature of the present invention as set forth in claim 1 is as shown in FIG. 1, (a) an electron gun in which cathode electrodes K, grid electrodes G1, G2 are disposed inside (a). A water tube (CRT) 1 having 2) and having a color purifying magnet 3, a positive convergence magnet 4 and a deflection yoke 5 at its periphery; (b) drive circuits 11, 12, 13 connected to this cathode electrode; (c) color signal reproducing circuit 41 connected to the drive circuits 11, 12, 13; (d) an image amplifying circuit 38 connected to this color signal reproducing circuit 41; (e) a waveform shaping circuit 37 connected to the video amplifier circuit 38; In an image display device having at least a microcomputer 17 having a pseudo composite video signal generation circuit 17a for supplying a high impedance, three-state signal VOUT of 1, 0 to a waveform shaping circuit 37, A synchronization signal generator 200 which is built in this image display device again and which generates a pseudo horizontal synchronizing signal and a pseudo vertical synchronizing signal based on the basic clock as shown in FIG. In accordance with the pseudo horizontal synchronizing signal HDV and the pseudo vertical synchronizing signal VDV according to the display setting unit 28 for setting the display mode of the image and the display mode of the image set by the display setting unit 28. At least a signal generator 27 for generating a state pulse signal VOUT, wherein the pulse signal VOUT of the three states is pseudo composite video by the waveform shaping circuit 37. No. S _QCV is being converted.

More preferably, as described in claim 2, in the first aspect, the synchronization signal generator 200 includes a basic clock generator 21 and a basic clock generator (as shown in FIG. 4). A horizontal cycle counter 22 which repeatedly counts the basic clock outputted at 21) up to a predetermined horizontal period and generates a horizontal synchronizing pulse HCK, and a vertical periodic counter which repeatedly counts the horizontal cycle pulse up to a predetermined vertical period. (23), the horizontal position decoder 24 generating the pseudo horizontal synchronizing signal HDV and the horizontal timing signal S11 than the counter value of the horizontal period counter 22, and the counter value of the vertical period counter 23. At least a vertical position decoder 25 for generating a vertical synchronization signal VDV and a timing signal S12 in the horizontal direction, wherein the signal generator 27 has a horizontal direction in accordance with the display mode of the image set by the display setting unit 28. A predetermined timing signal is selected from the dimming signal S11 and the vertical timing signal S12, and the selected timing signal, the pseudo horizontal synchronizing signal HDV, and the pseudo vertical synchronizing signal VDV are synthesized to generate a 3-state pulse signal VOUT. .

The second aspect of the present invention as set forth in claim 4 includes an electron gun 2 having cathode electrodes K, grid electrodes G1, and G2 disposed therein, as shown in FIG. The water pipe 1 having the color purifying magnet 3, the positive convergence magnet 4, and the deflection yoke 5, the drive circuits 11, 12, 13 connected to the cathode electrode K, and the grid electrode G2. The connected screen adjustment circuit 18, the color signal reproducing circuit 41 connected to the drive circuits 11, 12, and 13, the image amplifying circuit 38 and the image amplifying circuit connected to the color signal generating circuit 41; 38) and a waveform generation circuit 37 connected to a deflection yoke 5 and connected to a deflection circuit 39 for applying a voltage to the deflection yoke 5 and an image amplification circuit 38, and a waveform shaping circuit 37 Is an adjustment method of an image display device having at least a microcomputer 17 for supplying a signal VOUT having a high impedance (Hz) and three states of 1 and 0 to the microcomputer 17. A predetermined signal is input, the microcomputer 17 outputs a predetermined three-state signal VOUT, and the three-state VOUT is converted into a predetermined pseudo composite video signal SQCV by the waveform shaping circuit 37, and the pseudo composite video signal SQCV is supplied to the image amplification circuit 38, a color signal is output from the image amplification circuit 38, and a predetermined color signal is supplied to the drive circuits 11, 12, 13 through the color signal reproducing circuit 41. A predetermined adjustment image is displayed on the water pipe 1, the voltage applied to the cathode electrode K and the grid electrode G2 using the predetermined adjustment image, the position of the color-purifying magnet 3, the positive convergence magnet 4 The adjustment method of adjusting the water pipe 1 by changing the position of the deflection yoke 5 and the position of the deflection yoke 5 is provided.

The pseudo composite video signal generation circuit incorporated in the image display device is also incorporated in the microcomputer 17 embedded in the image display device and simultaneously outputs a predetermined signal for displaying the desired adjustment image on the receiving tube to the microcomputer 17. By input, the predetermined three-state signal VOUT is output as the output of the microcomputer 17. The waveform shaping circuit 37 converts the three-state signal VOUT into a predetermined pseudo composite video signal SQCV, supplies the pseudo composite video signal SQCV to the image amplifier circuit 38, and supplies the color signal from the image amplifier circuit 38. A predetermined color signal is outputted to the drive circuits 11, 12, and 13 through the color signal reproducing circuit 41, and the desired adjustment image is displayed on the water pipe 1. Using the desired image for adjustment, the voltage applied to the cathode electrode K and the electrode G2, the position of the color-purifying magnet 3, the position of the positive convergence magnet 4, the position of the deflection yoke 5 and the like can be changed. Various adjustments such as the white balance adjustment and the color purity adjustment of the correlation 1 are performed. Therefore, it is not necessary to wire another color signal generator for adjustment or the like to the image display apparatus outside the image display apparatus. In other words, since it has a color signal generating means itself, adjustment of the water pipe can be simplified in a short time. Here, the microcomputer 17 has a synchronization signal generation unit 200 for generating a pseudo horizontal synchronization signal HDV and a pseudo vertical synchronization signal VDV, as shown in FIG. 4, and a display setting for setting a display form of an image therein. The high-impedance (Hz), three-state signals VOUT of 1 and 0 are based on the pseudo horizontal synchronous signal HDV and pseudo vertical synchronous signal VDV according to the display form of the image set by the display setting unit 28. The pseudo composite video signal SQCV can be obtained simply by incorporating an output signal generator 27 to output and passing the output VOUT of the microcomputer 17 through the waveform shaping circuit 37. That is, since it is not necessary to form the color signal by the analog means as in the related art, the circuit for forming the color signal can also be extremely simplified.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a block diagram showing the main components of a television receiver according to the first embodiment of the present invention. This television receiver receives a color image transmitted by the NTSC system and has a color receiver (1). In the neck portion of the color receiving tube 1, three electron guns 2 for emitting, controlling, accelerating, and converging electron beams are provided, corresponding to R (red), G (green), and B (blue), respectively. Each of these electron guns 2 arranges the cathode electrode K, the first grid electrode G1, and the second grid electrode G2, respectively. The color purifying magnet 3 and the positive convergence magnet 4 are sequentially attached to the neck portion and the outer circumference of the color receiving tube 1 toward the corner of the receiving tube 1. The color purifying magnet 3 is used for color purifying adjustment described later, and two donut-shaped permanent magnets are stacked. When the opening angles of the two sheets are changed, the strength of the magnetic field is changed, and when the two sheets are rotated simultaneously, the direction of the magnetic field is changed. It is. The positive convergence magnet 4 is used for the convergence adjustment described later, and consists of a 4-pole magnet and a 6-pole magnet in order to slightly move the red electron beam and the blue electron beam.

In addition, a deflection yoke 5 having a set of horizontal deflection and vertical deflection coils is attached to the corner portion of the color receiving tube 1, and the deflection yoke 5 can be moved up, down, left, and right during adjustment. It is supposed to be. In addition, a shadow mask (color sorting mechanism) 6 in which a plurality of holes are opened is attached to the face plate side of the panel portion. The three-color phosphor surface 7 is formed again corresponding to the individual holes of the shadow mask 6, and the color receiver tube 1 is formed at each incident angle of the three electron beams incident on the holes of the shadow mask 6 again. Color selection is performed by this. That is, the electron beam transmitted from the red electron gun 2 is designed to touch only the red phosphor 7 through the hole of the shadow mask 6, and the green only touches the green phosphor and the blue only the blue phosphor.

On the other hand, RGB drives 11, 12 and 13 are respectively connected to the cathode electrodes K of the three electron guns 2 of the color receiving tube 1, and R cut-off drives are further connected to the RGB drives 11, 12 and 13, respectively. The adjustment circuit 14, the G cut-off drive adjustment circuit 15, and the B cut-off drive adjustment circuit 16 are connected, respectively. The R.G.B drive circuits 11, 12, 13 are circuits which take in primary color signals R.G.B and drive them to the cathode electrodes K, respectively. The RGB cut-off drive adjustment circuits 14, 15 and 16 adjust the drive voltage applied to each cathode electrode K and adjust the anode current of each color of RGB while adjusting the cut-off point of RGB of the water pipe 1; The adjustment is performed by operating a chassis of a television receiver or a variable resistance knob attached to a predetermined operation panel inside the receiver.

In addition, the television receiver of the embodiment of the present invention is equipped with a microcomputer 17 as one component thereof, and the microcomputer 17 adjusts various water tube peripheral parts and the like in the completion manufacturing process of the television receiver. A pseudo composite video signal generation circuit 17a for generating a test video signal used pseudo for this purpose is built in. The high impedance (Hz), 1, 0 three-state signal Vout output from the pseudo composite video signal generation circuit 17a is input to the waveform shaping circuit 37 and the pseudo composite video signal output from the waveform shaping circuit 37. The SQCV is input to the image amplifier circuit 38. The waveform shaping circuit 37 may use a circuit as shown in FIG. The synchronizing signal and the color signal are output from the image amplifying circuit 38 and the synchronizing signal is applied to the deflection yoke 5 through the deflection circuit 39. On the other hand, the color signal output from the image amplification circuit 38 is supplied to the R.G.B drive circuits 11, 12, 13 through the color signal reproduction circuit 41.

FIG. 3 (a) is a timing chart showing the relationship between the input signal I _A and the output signal O _B of the waveform shaping circuit of FIG. 2, and FIG. 3 (b) shows an image of a television screen as shown in FIG. The figure corresponds to the timing chart. The microcomputer high impedance (Hz), 0, and VOUT is the output of the three-state output of Figure 1, the waveform shaping circuit 37 is passed after the third the video signal (pseudo composite video, as shown in O _B of (A) Signal) SQCV, and the screen image shown in FIG. In FIG. 3 (b), HD is a horizontal sync pulse.

As shown in FIG. 1, a screen adjustment circuit 18 is connected to the second grid electrode G2 of the color water pipe 1. The screen adjustment circuit 18 is a circuit for adjusting the second grid voltage applied to each second grid electrode G2, and the adjustment is performed by operating the chassis of the television receiver or the variable resistance hand shaving attached to a predetermined operation panel.

4 is a block diagram showing the internal structure of the pseudo composite video signal generation circuit 17a shown in FIG. The pseudo composite video signal generation circuit 17a repeatedly counts the basic clock generator 21 which generates the basic clock CK and the basic clock CK up to the normal horizontal period, and at the same time, the horizontal cycle count that generates the horizontal synchronous pulse HCK ( 22) and the horizontal cycle counter 22 and the output side of the vertical cycle counter 23 have a vertical cycle counter 23 which repeatedly counts the number of horizontal synchronization pulses HCK to a normal vertical cycle portion. And vertical position decoder 25, respectively. For example, NTSC Bangsigro has 63.5μs horizontal cycle and 262.5 HCK pulse counts for vertical cycle. The horizontal position decoder 24 has a function of generating a pseudo horizontal synchronizing signal HDV and various timing signals S11 in the horizontal direction from the count value of the horizontal period counter 22, and the vertical position decoder 25 has a vertical period counter 23. Has a function of generating a pseudo vertical synchronizing signal VDV and various timing signals S12 in the vertical direction at the count value of. And the output side of these horizontal position decoder 24 and the vertical position 25 is connected to the signal generator 27. As shown in FIG. This signal generator 27 is connected to a display setting unit 28 that outputs a screen display setting signal S13 for setting a display form of a TV screen, and in accordance with the screen display setting signal S13 from this display setting unit 28. A three-state signal VOUT of Hz (high impedance), 1, and 0 is output by selecting necessary timing signals from the various timing signals S11 and 12, and synthesizing the selected timing signal with the pseudo horizontal synchronizing signal HDV and the pseudo vertical synchronizing signal VDV. will be.

5 is an overall system block diagram of the micon 17 provided with the pseudo composite video signal generation circuit according to the present embodiment. For simplicity, however, an assignment control circuit, a system control circuit, a timing generator, and the like are not shown. For example, when an input signal corresponding to a desired pseudo composite signal is input to the input / output port of the micon 17 by operating a remote control operation panel, a chassis of a television receiver, a key of an internal operation panel, etc., the input signal of the micon 17 is input to the input signal of the micon 17. Processing by software embedded in the program memory (ROM) 42 is performed, and the processed corresponding signal is sent to the display installation unit 28 via the data bus 43. In the display mounting section 28, as shown in FIG. 4, the screen display setting signal S13 is outputted, and a three-state signal of Hz, 1, 0 is output from the signal generator as the output VOUT of the micon 17. As shown in FIG.

In the present embodiment, the three-state signal VOUT of the output of the micon is output as the pseudo composite video signal SQCV through the waveform shaping circuit 37, and these pseudo composite signals SQCV are all vaccines (Fig. 6) corresponding to the adjustment operation described later. (a), white / black signal (figure 6 (b), RGB monochromatic signal (figure 6 (c)), cross hatch signal (figure 6 (d)), dot signal (figure 6 (e)) , A cross / dot signal (Fig. 6 (f)) or a cross signal (Fig. 6 (g)), and Fig. 6 (c) is a convenience for distinguishing it from Fig. 6 (a). Although it is expressed as a cross hatch, it is a signal that is actually a monochromatic image of the front side, as shown in Fig. 6 (b).

Next, various adjustment operations of the present embodiment performed in the completion manufacturing process of the television receiver will be described in detail.

(1) Continuous Heat Run

This continuous heat run is a task for detecting the color water pipe 1 and other initial defects which comprise a television receiver. In other words, the white display that requires the most load is displayed on the color receiving tube 1 at a predetermined time, and the television receiver is loaded. Specifically, the display setting unit 28 of the pseudo composite video signal generation circuit 17a is set for full-back display using a remote control operation panel or the like, and a full-back signal is generated as the pseudo composite video signal S _QCV . By supplying to the cathode electrode K of the color receiving tube 1 through the amplifying circuit, the color signal reproducing circuit and the R, G, B drive circuits 11, 12, 13, the color receiving tube (as shown in FIG. The entire screen of 1) is displayed in white for a predetermined time to detect an initial failure. According to the present invention as described above, the continuous heat test in the complete manufacturing process of the television receiver can be made simple and easy without particularly involving wiring work with an external circuit. Thereby, time and cost in a completion manufacturing process can be reduced.

(2) white balance adjustment

In order to accurately reproduce the black and white image in the color receiver tube 1, it is necessary to set the ratio of the electron beam emitted from the three electron guns 2 to some value by the luminous efficiency of the phosphor 7 or the like. This ratio must be the same even if it is a light or dark part of the image. If there is an error in this ratio, the entire black-and-white image is colored, and accurate color reproduction cannot be performed at the time of color broadcast reception. Therefore, the white balance adjustment is performed by adjusting the operating point and anode current characteristics of each of the electron guns 2 of R, G, and B as the white balance adjustment, and making the image without a specific color even when the image is a bright or dark portion. Specifically, the screen adjustment of the color water pipe 1, the cut-off adjustment of red, green, blue, and the drive adjustment of blue, red (green) are performed in the procedure described below.

(1) First, operation by an operation panel such as a remote control operation panel is performed, and a predetermined signal is input to the microcomputer 17 to cancel all the automatic adjustment relations of the television receiver, and then display setting of the pseudo composite video signal generation circuit 17a. The section 28 is set for black / white display, and a black / white signal is generated as the pseudo composite video signal S _QCV . 13, the three cathode electrodes K of the color water tube 1 are supplied to display the screen of the color water tube 1 in two colors, black and white, as shown in FIG.

(2) Control the minimum of the contrast by operating the remote control panel or other predetermined control panel, maximize the brightness control, and then adjust the screen, red, green, and blue cut-off adjustments to the control panel. Rotate the resistance knob to the minimum, then return it about 1/4 turn.

③ Switch the service switch on the control panel so that the raster is one horizontal line, and slowly turn the variable resistance knob of the screen adjustment to the position where only one color of red, green and blue is visible.

④ Operate the variable resistance knob of the cut-off adjustment to increase the anode current of each color so that red, green, and blue are only visible, and then turn the service switch back to the screen.

⑤ Adjust the red and blue drive adjustment variable resistor knob or the green and blue and drive adjustment variable resistor knobs to adjust the black and white image, ie no color, on the bright screen, and then adjust the brightness adjustment to adjust the color on the dark screen. Make sure it is not stuck. If it is colored, repeat the adjustment of ① to ⑤.

When the white balance adjustment meter is used for the white balance adjustment, it may be necessary to first correct the white balance adjustment meter itself. For this reason, the red, green, and blue monochromatic signal from a television receiver is supplied from the outside of a white balance adjustment measuring instrument as a reference signal for calibration, and adjustment is performed. At that time, the display setting unit 28 of the pseudo composite video signal generation circuit 17a inside the television receiver is set for R, G, B monochrome display using a remote control operation panel or the like, and R is the pseudo composite video signal SQCV. Generates a G-B monochromatic signal, which is passed through the image amplifier circuit 38, the color signal reproducing circuit 41, and the R, G, B drive circuits 11, 12, and 13 to the cathode electrode of the color image tube 1; By supplying to K, the screen of the color water pipe 1 is displayed in one color of red / green / blue as shown in Fig. 6C. By calibrating the white balance adjustment meter using the color of the screen of the water pipe 1, the white balance adjustment work performed in the complete manufacturing process or maintenance work of the television receiver can be easily performed without any special wiring work. You can do it. Thereby, time and cost in a completed manufacturing process can be reduced, and it is not necessary to bring a power supply for white balance adjustment, etc. to the field of each home etc. also in maintenance and maintenance work, and the efficiency can be made. In addition, the white balance adjustment meter can be easily calibrated, and in the event of an abnormality of the white balance adjustment meter in the field, it can be easily recalibrated, thereby making maintenance and maintenance highly efficient.

(3) Adjusting / Checking Deflection Distortion and Amplitude of Image

A predetermined input signal is input to the microcomputer 17 using a remote control operation panel or the like, the display setting unit 28 of the pseudo composite video signal generation circuit 17a is set for cross hatch display, and the pseudo composite video signal Generates a cross hatch signal as S _QCV , which is applied to the cathode of the color image tube 1 through the image amplifier circuit 38, the color signal reproducing circuit 41, and the R, G, B drive circuits 11, 12, 13; By supplying to K, the lattice-shaped pattern as shown in FIG. 6 (d) is displayed on the screen of the color water pipe 1. As this screen can confirm and adjust deflection distortion and amplitude of image, adjustment of deflection distortion and amplitude of image carried out at the time of completion of manufacturing process or maintenance work of TV receiver, and the confirmation work are accompanied by any special wiring work. It becomes easy without work. This reduces the time and cost of the finished manufacturing process and eliminates the need to bring in pseudo composite video signal generators and other power supplies for R, G and B drive circuits in the field. Efficiency can be achieved.

(4) screen adjustment

Similarly, a predetermined input signal is sent to the microcomputer 17, the display setting portion of the pseudo composite video signal generation circuit 17a is set for dot pattern display, and a dot signal is generated as the pseudo composite video signal S _QCV , which is an image. The amplification circuit 38, the color signal reproducing circuit 41 and the R, G, B drive circuits 11, 12, 13 are supplied to the cathode electrode K of the color receiving tube 1, thereby A dot pattern as shown in Fig. 6 (e) is displayed on the flower. By observing this screen and adjusting the screen, it is possible to easily perform the adjustment work without any special wiring in the image adjustment performed during the completion manufacturing process of the television receiver or maintenance work. In particular, although there is a high voltage circuit around the water pipe, the present invention is safe without dangerous wiring. As a result, time and cost in the finished manufacturing process can be reduced, and the maintenance and repair work can be made efficient without the need to turn on a signal generator or a power source on the site of each home or user.

(5) Convertor

The green electron gun 2 in the center of the R, G, and B electron guns 2 of the color water tube 1 coincides with the central axis of the color water tube 1, and the red and blue colors on the left and right sides thereof. The electron gun 2 is designed to allow three electron beams to overlap the predetermined phosphor 7. In reality, however, the electron beams are often not overlapped so that the electron beams are not overlapped. Therefore, the adjustment to apply a magnetic field by the positive convergence magnet 4 so as to overlap at the center of the screen is referred to as conversion adjustment. This conversion adjustment is carried out in the following procedure.

(1) First, a predetermined signal is input to the microcomputer 17 using a remote control operation panel or the like of the image display device of the present invention, and the display setting section 28 of the pseudo composite video signal generation circuit 17a is cross / dotted. Set for display, a cross / dot signal is generated as the pseudo composite video signal S _QCV , which is then used for the image amplifier circuit 38, the color signal reproduction circuit 41, and the R, G, B drive circuits 11, 12, 13; By supplying to the cathode electrode K of the color receiving tube 1 through, a dot and a lattice pattern as shown in FIG. 6 (f) are displayed on the screen of the color receiving tube 1.

(2) Although the positive convergence magnet 4 is composed of a 4-pole magnet and a 6-pole magnet, the 4-pole magnet is adjusted to the cross hatch portion of the center of the screen, and is adjusted to overlap magenta (dark green) by red and blue vertical lines. At the same time, adjust the 4-pole magnet again to overlap the horizontal lines of red and blue to form magenta.

③ Adjust the 6-pole magnet of the positive convergence magnet (4) to overlap the vertical lines of green and magenta, and adjust the 6-pole magnet again to overlap the horizontal lines of green and magenta to white.

By adjusting ① to ③, the red, green, and blue lines in the center of the screen overlap with the horizontal lines.

④ Next, adjust the color of the peripheral part of the screen. Specifically, the position of the deflection yoke 5 is corrected by shaking up and down or left and right, and the three colors of red, green, and blue overlap, and when the adjustment is completed, the nose portion and the deflection yoke (5) of the water pipe 1 are completed. A rubber wedge is put in between to fix the deflection yoke (5). By using such an adjustment method, it is possible to easily and safely perform the adjustment work without any special wiring in the conversion adjustment performed at the completion of the television receiver or during maintenance work. As a result, the time and cost in the finished manufacturing process can be reduced, and the maintenance and repair work can be made more efficient without having to bring a signal generator or the like into the field.

(6) Color purity adjustment (PC adjustment)

As described above, the color receiver tube 1 is designed so that the electron beams emitted from the three electron guns 2 of R, G, and B touch each phosphor 7 of red, green, and blue. In practice, however, the electron beam does not touch the predetermined phosphor 7 correctly due to some non-uniformity in manufacturing of the electron gun 2, in combination with the deflection yoke 5, or an external magnetic field. This is called poor color purity. Thus, by adjusting the color purity, the front of the screen can reproduce even colors without any color defects. Specifically, a predetermined input signal is input to the microcomputer 17 using a remote control operation panel or another operation panel, and the display setting unit 28 of the pseudo composite video signal generation circuit 17a crosses (+). By setting for pattern display and generating a black cross signal as the pseudo composite video signal S _QCV and supplying it to the cathode electrode K of the color receiving tube 1, the screen of the color receiving tube is shown in FIG. 6 (g). The cross pattern of one cross is displayed. Then, by shifting the position of the deflection yoke 5 slightly back and forth by adjusting the cross pattern of the cross and adjusting the color-purifying magnet 3, the front surface can reproduce the color evenly without color defects. Therefore, the adjustment work can be facilitated in the adjustment of the color production adjustment or the like performed during the completed manufacturing process of the television receiver or maintenance work. As a result, time and cost in the finished manufacturing process can be reduced, and the maintenance and maintenance work can be made more efficient. In particular, with the increase in the size of the television receiver and the increase in the size of the receiving tube 1, the color purity defect is particularly likely to occur in a large color receiving tube having a large deflection angle, but according to the above-described method, the adjustment is easy. As a result, time and cost can be reduced. In particular, regarding poor color purity, there are magnetic fields generated by magnetization of reinforcing steel bars and steel frames used in houses, and in some cases, the influence of geomagnetism varies from place to place. In this case, it is not necessary to carry a complicated wiring by bringing a dedicated power supply to each home during adjustment and maintenance in each home, so that the image display device can be easily adjusted and maintained in a short time.

In addition, although the description in the above embodiment demonstrated the NTSC system receiver, it may be a high-definition (HDTV) receiver. In addition, although illustrated with a color receiving tube, it is a matter of course that a black and white television set may be used. In addition, it is a matter of course that the present invention can be applied not only to television receivers but also to other image display devices such as displays of measuring instruments such as various CRT oscilloscopes, various displays for computers, and displays of game devices. It is suitable to use this invention especially for a very large screen (VLS).

As described in detail above, according to the present invention, a synchronization signal generation unit for generating a pseudo horizontal synchronization signal and a pseudo vertical synchronization signal based on a basic clock, a display setting unit for setting a display form of an image, and a display setting unit A signal generator for outputting and generating a three-state pulse signal V _OUT based on the pseudo horizontal synchronizing signal and the pseudo vertical synchronizing signal in accordance with the set image display mode is provided in a microcomputer of an image display apparatus such as a television receiver. The pseudo composite video signal S _QCV can be obtained simply by passing the pulse signal V _OUT of the three states output from the microcomputer through the waveform shaping circuit. In other words, the color signal for adjusting the receiving tube can be supplied by a circuit much simpler than the pseudo composite video generation by the conventional analog circuit. In addition, since color signal generation circuits such as pseudo composite video signals are incorporated in the image display device, there is no need for external wiring every time adjustment.

Therefore, according to this invention, the adjustment work of the periphery of a water pipe etc. performed at the time of completion of a manufacturing process of image display apparatuses, such as a television receiver, and maintenance work can be made easy. As a result, time and cost in the finished manufacturing process can be reduced, and the maintenance and maintenance work can be made more efficient.

In particular, since the pseudo horizontal synchronizing signal and the pseudo vertical synchronizing signal are generated using the counter values of the horizontal period counter and the vertical period counter, pseudo composites conforming to various television systems such as NTSC system or HITV system. The video signal can be generated simply and accurately, and can be manufactured with a wide range of versatility and a low cost.

In particular, with the increase in the size and size of various image display apparatuses such as television receivers, the size of the receiving tube has increased, and color purity defects are not easily generated in large television receivers having a large deflection angle, but according to the present invention, the adjustment is easy. The time and cost can be reduced. Adjustment of the television receiver is adjusted at the time of factory shipment, and operation | movement is also stable and reliability is improved. Therefore, in general, adjustments are rarely made at the user's site after shipment, but for poor color purity, there are magnetic fields generated by magnetization of reinforcing steel bars and steel frames used in houses, and the influence of geomagnetics may vary from place to place. It may be necessary to readjust. The present invention is not limited to such color purity adjustment. According to the present invention, R, G, and B drive circuits have been conventionally maintained and adjusted in the field such as various types of homes such as white balance adjustment, screen adjustment, and image distortion distortion adjustment. It is possible to easily perform adjustment and maintenance in a short time without having to carry out complicated wiring by bringing a signal generator for applying a color signal to the field or various power supplies therefor.

Claims (4)

A pseudo signal generating unit for generating a pseudo horizontal synchronizing signal and a pseudo vertical synchronizing signal based on the basic clock, a display setting unit for setting the display form of the image, and a pseudo signal according to the display form of the image set by the display setting unit. A pseudo composite video signal generation circuit having at least a signal generator for generating a three-state pulse signal based on a horizontal synchronizing signal and the pseudo vertical synchronization signal, wherein the three-state pulse signal is connected to the pseudo composite video signal generation circuit. And converting the pseudo composite video signal into a pseudo composite video signal by a waveform shaping circuit, wherein the pseudo composite video signal generating circuit is embedded in a microcomputer embedded in an image display device. 2. The apparatus of claim 1, wherein the synchronization signal generator comprises: a basic clock generator; a horizontal period counter for repeatedly counting a basic clock output from the basic clock generator to a predetermined horizontal period and generating horizontal synchronization pulses; A vertical period counter for repeatedly counting horizontal synchronizing pulses to a predetermined vertical period, a horizontal position decoder for generating the pseudo horizontal synchronization signal and a timing signal in the horizontal direction from the counter value of the horizontal period counter; At least a vertical position decoder for generating a pseudo vertical synchronization signal and a timing signal in a vertical direction at a counter value, wherein the signal generator is a timing signal in the horizontal and vertical directions in accordance with the display form of the image set by the display setting unit; Selects a predetermined timing signal from the selected timing signal and A signal generating circuit, characterized in that a three-state pulse signal is generated by combining a horizontal synchronous signal and a pseudo vertical synchronous signal. The pseudo composite video signal is supplied to the drive circuit of the cathode electrode of the water pipe through an image amplifier circuit connected to the waveform shaping circuit and a color signal reproduction circuit connected to the image amplifier circuit. Signal generating circuit, characterized in that. An electron gun having a cathode electrode and a grid electrode disposed therein, a water pipe having a color purifying magnet, a positive convergence magnet, and a deflection yoke at the periphery thereof, a drive circuit connected to the cathode electrode, and connected to the grid electrode The connected screen adjustment circuit, the cutoff drive adjustment circuit connected to the drive circuit, the color signal reproducing circuit connected to the drive circuit, the video amplifying circuit connected to the color signal reproducing circuit, the video amplifying circuit and the deflection yoke. And a deflection circuit for applying a voltage to the deflection yoke, a waveform generation circuit connected to the video amplification circuit, and a microcomputer for supplying a high impedance, 3-state signal of '1, 0' to the waveform shaping circuit. In one image display apparatus, a predetermined signal is input to this microcomputer, and a predetermined three-state signal is transferred to this microcomputer. A computer outputs the signal, and the waveform shaping circuit converts the three-state signal into a predetermined pseudo composite video signal, supplies the pseudo composite video signal to the video amplifier circuit, and outputs a color signal from the video amplifier circuit. The color signal is supplied to the drive circuit through this color signal reproducing circuit, a predetermined image for adjustment is displayed on the receiving tube, and a voltage applied to the cathode electrode and the grid electrode using the predetermined image for adjustment. And adjusting the water tube by changing the position of the color-purifying magnet, the position of the positive convergence magnet, and the position of the deflection yoke.