JPS5913965A - Display device - Google Patents

Abstract

PURPOSE:To eliminate the adjustment for positioning between coordinates of each of devices and to eliminate the drift among the coordinates with change in ambient temp. by performing digitally the changing-over and positioning of the >=2 ccordinates such as radar coordinates and display coordinates. CONSTITUTION:The set signals for the display coordinate positions on an X side and a Y side are multiplied by the coefft. of multiplication in multipliers 18, 2 by which the weight of bit is made the same as the weight of the set signals for radar coordinate positions. The signals are set then outputted to digital change- over devices 19, 22. The set signals for the radar coordinate positions on the X side and Y side or the set signals for the display coordinate positions on the X side and Y side from the multipliers 18, 21 are selected by the change-over signal for radar coordinates and display coordinates in the devices 19, 22, and are outputted to a D/A converter 20 on the X side and a D/A converter 23 on the Y side. The outputs from the converters 20, 23 are inputted to analog adders 5, 15, and are added to the symbol signal from a symbol generator 10.

Description

[Detailed description of the invention] This invention has two or more display positions on the same screen,
The present invention relates to a display device that can perform alignment with high precision.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 is an A/A converter for setting the X-side coordinate position, 2 is a symverter for setting the XIIJ display coordinate position, 6 is an attenuator, 4 is an analog switch, 5 is an analog adder, 6 is a CR, T
Position distortion/focus distortion correction circuit, 7 is an X-side deflection amplifier,
8 is a deflection coil, 9 is a CRLR, 10 is a symbol generator, 11 is a converter for setting the Y-side coordinate position, 12 is a converter for setting the Y-side display coordinate position, 13 is an attenuator, 14 is an analog switch, 15 1 is an analog adder, 16 is an X-side deflection amplifier, and 17 is an unblanking amplifier/focus amplifier.

In the display device constructed as shown in FIG. The voltage is input to the converter 11, converted to an analog voltage, and input to the analog switch 4 and the analog switch 14. On the other hand, the Y-side and Y-side display coordinate position setting signals are provided by the X-side display coordinate position setting/A converter 2 and the Y-side display coordinate position setting signal 4. Converter 12VC is input, analog voltage is converted to 1Evc, and attenuator 3
and are input to the attenuator 13, respectively. With these attenuators 3.16, the above desired comperme 2, 12
After attenuating the input signals of jJ and others, they are input to the analog switch 4 and the analog switch 14, respectively. These analog switches 4 and 14 select a radar coordinate position signal and a display coordinate position signal using a radar coordinate/display coordinate switching signal, and output the selected signals to analog adders 5 and 15. The analog adder 5.15 of this camera adds the position signal input from the analog switch 4.14 and the symbol signal input from the symbol generator 10, and outputs the result to the CRT position distortion/focus distortion correction circuit 6. Ru. This CRT position distortion/focus distortion correction circuit 6 receives the signal obtained by adding the symbol signal to the position signal from the analog adder 5.15 and the symbol unblanking signal from the symbol generator 10, and generates bin cushion distortion. After performing correction, focus correction WEE generation, unblanking signal delay, etc., the signal is output to the X-side deflection amplifier 7, the Y-side deflection amplifier 16, and the unblanking/focus amplifier 17. Deflection signals from these deflection amplifiers 7 and 16 are input to the deflection coil 8, and unblanking signals and focus signals from the unblanking/focus amplifier 17 are input to the CFIT 9.

In this way, the electron beam of C1IT9 is controlled,
The required figure is displayed on the PPI screen. In addition, Fig. 2 is an explanatory diagram of the above-mentioned operation.The outermost circumference of the PPI screen for radar coordinates is 100, and the outermost circumference of the PPI screen for display coordinates is 1, and the symbols of each coordinate are aligned. This shows how it will be displayed afterwards. Further, FIG. 3 shows the converter 1.11 for setting the radar coordinate position on the YCX side and Y side as described in FIG. 1 above, and FIG. Converter 2.12 is shown.

Since conventional display devices are configured as described above, switching and positioning of two or more coordinates, such as radar coordinates and display coordinates, must be performed using analog voltages, making it necessary to manufacture many identical display devices. In this case, it is necessary to adjust each attenuator to align the coordinates, and there is also a drift between the coordinates due to changes in ambient temperature, so there are disadvantages such as the need for a large number of expensive converters. .

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and provides an apparatus for digitally switching and aligning two or more coordinates such as radar coordinates and display coordinates. It is an object of the present invention to provide a display device that eliminates the need for alignment adjustment between coordinates at each time, and eliminates drift between coordinates due to changes in ambient temperature.

An embodiment of the present invention will be described below with reference to the drawings. Fifth
In the figure, the same reference numerals as in FIG. 1 have the same functions, and detailed explanation thereof will be omitted. In Figure 5,
18.21 is a digital multiplier, 19.22 is a digital switch, 20 is an X side/A converter, and 23 is a Y side converter.

As shown in Figure 5 above, 51Cll! In the display device made by X
The side and Y side display coordinate positioning signals are multiplied by multiplication coefficients in multipliers 18 and 21 vc to make the bit weights the same as the radar coordinate positioning signals, and then output to the digital switch 319.22. Ru. This digital switch 19.22 outputs a radar coordinate/display coordinate switching signal, an X-side and Y-side radar coordinate position setting signal, or an X-side and Y-side display coordinate position setting signal from the multiplier 18.21. Selected X side converter 2
0 and Y fljl D/A:1 is output to the inverter 23. For X side and Y side 4. The outputs from the converters 20, 23 are input to an analog adder 5.15 and summed with the symbol signal from the symbol generator 10. The subsequent operation is similar to the conventional technique described with reference to FIG.

In addition, X side/A converter 20 and Y @'J D/A
The converter 23 uses a conventionally high-precision D/A converter to prevent the outputs of the digital multipliers 18 and 21 from being decimated.

In the above embodiment, digital multipliers 18 and 21 are provided for the two coordinates f between the radar coordinates and the display coordinates, but digital multipliers are provided for each of a large number of coordinates to perform amplitude matching between the respective coordinates. You may do so.

As described above, according to the present invention, a digital multiplier is used in place of a conventional analog attenuator, a digital switch is used in place of an analog switch, and positioning between two coordinates is performed digitally. Since the configuration is configured to perform this operation, there is no need to manufacture a large number of identical display devices and adjust the alignment between the π2 coordinates for each of these display devices at a regular time.
Furthermore, drift between coordinates due to drift in ambient temperature can be eliminated, and a highly accurate device can be obtained.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional display device, Fig. 2 is a diagram showing the operation of the one shown in Fig. 1, and Fig. 6 is a diagram showing the operation of the one shown in Fig. 1. FIG. 4 is a block diagram showing a combination converter for setting display coordinate positions on the Y side and Y side of FIG. 1, and FIG. 5 is a block diagram of a display device showing an embodiment of the present invention. be. 5: Analog adder, 9: CRT, 10 Nishinpol generator, 15: Analog adder, 18: Digital multiplier, 19: Digital switch, 20: X911
ID4 converter, 21: Digital multiplier, 22; Digital filter, 23: Y @ll I)
/A: lnverter. Agent Shin Kuzuno - Figure 3 Figure 4

Claims (1)

[Claims] 1. Having two or more types of display positions such as display coordinate position and radar coordinate position on the same screen. , a display device in which each display position is adjusted digitally in a device in which the weights of digital quantities representing each display position are different.