JPS6364242A - Signal generator - Google Patents

Abstract

PURPOSE:To make in possible to regulate the dynamic convergence in converting the display positions of red, green, and blue dots, by adding an image screen memory, a delay line, and a control circuit to read the content of the memory and convert the output of the delay line, in a signal generation used when a deflecting yoke is installed to a color cathode-ray tube. CONSTITUTION:The output of a crystal oscillator 1 is frequencydivided by a clock frequency converter 2 to determine the amount of the display dots, which are added to a shift register 10 through a counter 3, an inverter 4, and a NAND circuit 5. And the horizontal position of a dot display position is set by frequency-dividing the output of the NAND circuit 5, while the vertical position thereof is set by frequency-dividing the horizontal frequency signal of a synchronism generator 7, both of which are used for address signals of the screen memory 9. Furthermore, shift amounts of parts of the screen are converted to a series signal at the register 10, the outputs of the blue and green memories (not shown in the figure) are also coonverted to series signals at register 11 and 12, and they are output through a delay line 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal generating device used when attaching a deflection yoke to a color cathode ray tube.

[Conventional technology]

As shown in FIG. 2, the work of attaching the deflection yoke to the color cathode ray tube is as shown in FIG.
KG, KB color signals and HD.

VD synchronization signal 33 is applied to the test set 31 (by the rule, these signals are amplified and KR, KG, and KB are applied to the color cathode ray tube through a cable 34, and a synchronization output 35 consisting of a horizontal output and a vertical output is sent to the deflection yoke 20. In addition to this, a high voltage is also supplied to the anode through the anode cable 36, and a crosshatch pattern is drawn on the color cathode ray tube screen.

In case 2, a dynamic convergence shift occurs in the crosshatch pattern as shown in Figure 4, and even if characters, etc. are displayed normally in the center of the screen, when viewed near the four corners, the characters, etc. A phenomenon occurs in which the image appears distorted. The deflection yoke 2o
Then, the convergence spirit magnet 21 is operated to adjust the deflection yoke to minimize the deviation, and the deflection yoke is installed and shipped to the user. However, if a color cathode ray tube is installed in a user's color receiver after shipping, the dynamic convergence will deviate due to differences unique to the color receiver, such as the placement of the power transformer, and A'fM will have to be performed again. Situations may occur. The amount of this shift reaches O1]1111+ or 0.51 depending on the color receiver,
Due to restrictions on the placement of each component such as a power transformer due to the miniaturization of color receivers, and from 15.75 KH, 22.
By increasing the horizontal synchronization frequency from 8KHz to 64KHz, even the slightest influence can reduce the
The positional deviation of is in the direction of expansion. Therefore, if the user's color receiver is not equipped with a digital convergence circuit or the like to correct dynamic convergence deviation, the dynamic convergence should be set to 0.1+n in advance to match the individual user's color receiver.
Color cathode ray tubes must be shipped with a shift of 0.51 to 0.51, and a signal generator for this purpose is required.

[Problem that the invention seeks to solve]

However, although conventional signal generators have the function of outputting characters and crosshatch patterns and switching between colors, they do not have the function of continuously shifting the crosshatch pattern. For this reason, the screen as shown in Fig. 3 has four red edges and a blue dot pattern 22, 23, 2, 2, 2, 2, 3, 3, 3, 4, 4 red edges, as shown in Fig. 1-1.・Color cathode ray tubes had to be shipped after being intentionally shifted to 1.
The drawback was that the extent to which the correction was made depended largely on intuition based on the sound of the work.

[Means for problem decomposition]

The present invention provides a signal generating device used when attaching a deflection yoke to a color cathode ray tube, which includes a screen memory, a delay line,
It is characterized by the addition of a control circuit that reads the contents of the screen memory and switches the output of the delay line, making it possible to adjust the dynamic convergence by shifting the display position of each red, green, and blue dot on the screen. do.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a part of a circuit diagram of an embodiment of the present invention, and shows only the red signal output circuit. The output of the crystal oscillator 1 is frequency-divided by a clock frequency switch 2 to determine the size of the display dot. A control signal is generated using a counter 3° inverter 4 and a di-NAND circuit 5 to control a shift register 10. The dot display position is determined by dividing the output of the NAND circuit 5 by a counter 6 for the horizontal position, and by dividing the horizontal synchronization signal from the synchronization generator 7 by a counter 8 for the vertical position, and using each dot as an address signal for the screen memory 9. do. The shift amount switching section 13 is a switch for changing the shift amount of dots, and by switching this, the shift amount of each part of the screen can be changed as a whole.

The shift register 10 receives the 8-bit output of the screen memory 9 and replaces it with a serial signal. This is because the switching speed of the screen memory 9 is slow, and if it were set to 120 n5ec, the dot clock could be controlled in units of 15 asec by passing through the shift register 10.

In a similar manner, the outputs of blue and green screen memories (not shown) are replaced by serial signals in shift registers 11 and 12.

The reason why registers are used for the three shift l's is that the delay line 1
7 to 8 stages using 3 bits, and the performance of the screen memory 9. If it has a sufficiently fast speed of 10°Sec and has a large capacity, the shift register 10,
11.12 becomes unnecessary.

The changeover switch 4 is a switch for not shifting the dots at all, and does not pass through the delay line 17.It can be used as a general signal generator. Dot signal generator 15
is a generation section for blanking, crosshatch, characters, etc., and is switched by a changeover switch 16. The delay line 17 is a commercially available delay line, and the amount of dot shift can be controlled from 0 nS0 in 5° sec increments up to 35 asec using a control signal.
The dots are shifted in 8 steps up to and output the dot signal to the outside through the output buffer 18.

Next, to describe the operation performed by the signal generator of the present invention, as shown in FIG. do. In this state, when a crosshatch pattern is output from the signal generator, a dynamically shifted crosshatch pattern is output on the screen of the color cathode ray tube. This is red and green.

Adjust so that the blue patterns match and fix the deflection yoke. Note that the signal generating device of the present invention requires green and blue circuits in addition to the above, and two more sets of circuits after the screen memory are provided.

〔Effect of the invention〕

As explained above, the present invention has the advantage of being able to control the horizontal display position of dots at any location on the screen by using screen memory, delay lines, and their control circuits. During installation, it can be used to correct dynamic convergence deviations caused by differences in color receivers used by users.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a diagram showing a set used for attaching the deflection yoke, Fig. 3 is a diagram showing a crosshatch pattern with no deviation, and Fig. 4 is a diagram showing a case with a dynamic convergence deviation. FIG. 3 is a diagram showing a crosshatch pattern. 1...Crystal oscillator, 2...Tarlock frequency switch,
3.6.8...Counter, 4...Inverter, 5.
... NAND circuit, 7... Synchronization generator, 9... Screen memory. 10.11.12... Shift register, 13... Shift amount switching section, 14.16... Changeover switch, 15.
...Dot signal generator, 17...Delay line, 18...
Output buffer, 1...Color cathode ray tube, 20...
- Deflection yoke, 21... Convergence utility magnet, 30... Signal generator, 31... Inspection set. Figure 2 Dream 3 Figure 4 Concave

Claims (1)

[Claims] A signal generator used when attaching a deflection yoke to a color cathode ray tube has a screen memory, a delay line, and a control circuit that reads the contents of the screen memory and switches the output of the delay line. A signal generating device characterized in that dynamic convergence can be adjusted by shifting the display position of dots on a screen.