JPH06121345A - Pattern generator - Google Patents

Abstract

PURPOSE:To decrease the number of components, to make the size small and to reduce the cost by eliminating the need for a linearity adjustment circuit in a deflection amplifier and allowing the pattern generator to make optional linearity adjustment. CONSTITUTION:A signal is inputted to a synchronizing separator circuit 6 of a deflection amplifier (horizontal system) 15 from an output section 3 through a pattern changeover circuit 5 and a signal processing and pattern position adjustment section 4 of a pattern signal generating section 14. Then a signal is sent to a horizontal deflection circuit 8 through a horizontal output transistor(TR) drive pulse generating circuit 7 to generate a sawtooth current to a horizontal coil 9 of a deflection yoke thereby displaying a cross hatch pattern or a dot pattern on a television screen and adjusting optionally the position of the picture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern generator used in a convergence inspection device for a deflection yoke for a color television receiver.

[0002]

2. Description of the Related Art In recent years, there is a strong demand for higher performance in color television receivers, and in particular, higher performance in convergence adjustment is required.

A conventional pattern generator used in a convergence inspection device for a color television receiver will be described below with reference to the drawings.

As shown in FIG. 6, a conventional pattern generator includes a pattern signal generating section 12 having a pattern selecting switch section 1, a signal processing section 2 and an output section 3, and a deflection amplifier (horizontal system) to which the output is inputted. 13 and 13. The deflection amplifier (horizontal system) 13 includes a sync separation circuit 6, a horizontal output transistor drive pulse generation circuit 7, a horizontal linearity signal generation circuit 10, a horizontal linearity adjustment transistor drive circuit 11, and a horizontal deflection circuit 8.
And its output is applied to the horizontal coil 9 of the deflection yoke.

The relationship and operation of each component will be described below. First, in the pattern signal generating unit 12, either the crosshatch pattern or the dot pattern is selected by the pattern selection switch unit 1 and the signal is sent to the signal processing unit 2 to perform processing according to the pattern, and then the output unit 3 Then, the signal is input to the sync separation circuit 6 of the deflection amplifier (horizontal system) 13. Then, a signal is sent to the horizontal deflection circuit 8 through the horizontal output transistor drive pulse generation circuit 7 to generate a sawtooth current in the horizontal coil 9 of the deflection yoke. Further, the deflection amplifier (horizontal system) 13 has a circuit for adjusting the linearity on the television screen, outputs a signal from the horizontal linearity signal generation circuit 10, and uses the horizontal linearity adjustment transistor drive circuit 11 for the horizontal deflection circuit. Output to 8 for adjustment.

[0006]

However, in the above-mentioned conventional configuration, since the linearity is adjusted by the deflection amplifier which is a part of the pattern generator, many power element components are required, and the component mounting area of the deflection amplifier and the heat sink are reduced. There is a problem that the volume is increased and the cost is increased. Also, since the linearity is adjusted by the deflection amplifier, the change ratio of the linearity on the screen is fixed, and the linearity of the image cannot be adjusted arbitrarily. That is, there is a problem that the inspection accuracy cannot be improved because the image position cannot be arbitrarily adjusted at many inspection points during the convergence inspection of the deflection yoke.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a pattern generator which eliminates the linearity adjustment in the deflection amplifier and enables the arbitrary linearity adjustment.

[0008]

In order to achieve the above object, the pattern generator of the present invention has a configuration including a pattern position adjusting circuit capable of arbitrarily adjusting the position of an image.

[0009]

According to the present invention, the vertical and horizontal lines of the crosshatch pattern can be independently output to arbitrary positions on the video screen in the above structure, and the position of each point of the dot pattern can be changed to the intersection point of the crosshatch pattern. And can be output on the video screen with a constant relative positional relationship.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in the pattern generator of this embodiment, the signal processing and pattern position adjusting unit 4 in the pattern signal generating unit 14 outputs the pattern signal from the output unit 3 via the pattern switching circuit 5, It is composed of a deflection amplifier (horizontal system) 15 to which the output is input. The deflection amplifier (horizontal system) 15 has a sync separation circuit 6 and a horizontal output transistor drive pulse generation circuit 7, and is configured so that the output signal from the horizontal deflection circuit 8 is applied to the horizontal coil 9 of the deflection yoke. ing.

The relationship and operation of each component will be described below. First, in the pattern signal generation unit 14, a signal is input from the signal processing and pattern position adjustment unit 4 through the pattern switching circuit 5 to the synchronization separation circuit 6 of the deflection amplifier (horizontal system) 15 from the output unit 3. Next, a signal is sent to the horizontal deflection circuit 8 through the horizontal output transistor drive pulse generation circuit 7 to generate a sawtooth wave current in the horizontal coil 9 of the deflection yoke.

Next, the operation of the signal processing and pattern position adjusting section 4 will be described with reference to FIGS. 2 and 5.

The horizontal reference clock generation circuit 21 generates a horizontal reference clock signal, and the vertical reference clock generation circuit 41 divides this signal to generate a vertical reference clock signal. The operation of the horizontal system in the case of the screen output pattern having the dot pattern x and the crosshatch pattern y as shown in FIG. 4 will be described below.
The output clock signal of the horizontal system reference clock generation circuit 21 is divided by the counter 22, and the output is decoded by the horizontal synchronization pulse generation circuit 23 to generate a synchronization pulse waveform c as shown in FIG. Similarly, the output divided by the counter 22 is decoded by the horizontal video area generating circuit 24 to generate a video area signal f as shown in FIG. Hereinafter, each signal waveform diagram is shown in FIG. Next, the output divided by the counter 22 is decoded by the variable area generation circuit 25 and input to each AND circuit 26, and the output pattern variable area signals h, i,
get j. Further, the reset signal p having the timing pulse at the leading edge of the signals h, i, and j is supplied to the variable area generation circuit 2
Generate in 5. The output pattern variable area signals h, i, j are set to HIGH by the AND circuits 26 and the OR circuit 27.
The output clock signal of the horizontal system reference clock generation circuit 21 is input to the counter 28 only when, and the counter 28 is reset by the reset signal p at the leading edge of the area pulse of the signals h, i, and j. That is, the counter 28 outputs the signal h,
It is a counter that counts the output clock signal of the horizontal reference clock generation circuit 21 in each area i and j. On the other hand, the analog signal input from the volume 31 or the microcomputer 32 is selected by the switch 33, and the A / D converter 3 is selected.
It is converted into a digital signal by 4. Volume 31,
In the case of the screen output pattern of FIG. 4, three sets of the microcomputer 32, the switch 33, and the A / D converter 34 are required, and the respective digital output signals are a1, a2, and a3. The output signals a1, a2, a3 correspond to the signals h, i, j, and are compared with the output from the counter 28 in the comparison circuit 29 to generate one pulse only when they coincide with each other. The pulse generated in each area is the signal f in the AND circuit 30.
The video signal b can be obtained by ANDing and.

Next, also for the vertical system, the video signal d is generated by the same operation as the horizontal system. Here, d corresponds to b when the waveform of FIG. 5 is replaced with a vertical system. Figure 3 here
, The AND circuit 41 outputs the signal b and the signal d.
To the OR circuit 42, the crosshatch pattern y shown in FIG. 4 can be generated. By selecting the pattern switching circuit 5 for switching the output between the AND circuit 41 and the OR circuit 42, the video signal of the dot pattern or the cross hatch pattern can be output to the output unit 3.

[0016]

As is apparent from the above embodiments, according to the present invention, the position of each line of the crosshatch pattern and the position of the dot pattern point can be arbitrarily set by digital processing. Since the adjustment circuit is not necessary, many power element parts can be deleted, the part mounting area can be small, and the cost can be reduced. Furthermore, because the position of the image can be adjusted arbitrarily at multiple inspection points during the convergence inspection of the deflection yoke,
It is possible to realize an excellent pattern generator that improves inspection accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram of a pattern generator according to an embodiment of the present invention.

FIG. 2 is a detailed block diagram of a signal processing and pattern position adjusting unit in the embodiment.

FIG. 3 is a pattern switching circuit diagram in the embodiment.

FIG. 4 is a pattern diagram on a television screen according to the embodiment.

FIG. 5 is a signal waveform diagram of essential parts of the pattern generator of the same embodiment.

FIG. 6 is a block diagram of a conventional pattern generator.

[Explanation of symbols]

 3 output section 4 signal processing and pattern position adjusting section 5 pattern switching circuit 14 pattern signal generating section

Claims (1)

[Claims] 1. A cross-hatching pattern and a dot pattern are generated, and a signal processing and pattern position adjusting section having means for independently changing the position of each horizontal and vertical line of the cross-hatch pattern is provided. A pattern generator having an output unit having a function of always maintaining the same positional relationship between the position of the intersection of a line and a horizontal line and the position of the dot of the dot pattern.