SU1001161A1 - Device for displaying vectors on crt screen - Google Patents

Description

The invention relates to automation, telemechanics and computing, technology and can be used in the synthesis of graphic information display devices on a CRT screen.

A device for displaying vectors on a CRT screen is known, comprising a control unit, deviation amplifiers, a rejection system, a CRT, keys, a differential amplifier 1.

In this device, the brightness of the lines is varied using digital-to-analog converters. Due to this, it is possible to display lines of different brightness, but under the condition that the CRT beam moves from point to point at a constant speed. In addition, the complexity of building the device is not justified for the cases of displaying machine-building drawings, where two gradations of brightness are sufficient (thick and thin lines).

Closest to the proposed technical entity is a device for displaying vectors on a CRT screen. The device contains a control unit, the first output of which is connected to the key input, the second one - to the inputs of the deviation amplifiers, the outputs of which are connected to the deflection system of the electron-beam tube, and one of the outputs of the latter connected to the CRT, the input of the differential amplifier / output switch and the outputs of the first and second current generators, the first inputs of which are connected to the second output of the modulator, receive the second input of the differential amplifier connected to the eio output and the second inputs of the first and second current generators 2.

This device backlight vector

15 is modulated by a pulse generator with a frequency which depends on the speed of movement of the beam on the CRT screen. However, when displaying engineering drawings on graphic

20 displays x are required to provide a full set of line types (thick, thin, dashed and dashed-dotted), and the known device does not allow to obtain dash-dotted lines.

25

The purpose of the invention is to expand the field of application of the device by allowing the display of dash-dotted vectors.

The goal is achieved by

Claims (2)

thirty . that a device containing a series-connected control unit and a beam deflection unit. connected to a CRT deflection system, the modulator of which is connected to one of the outputs of the modulation unit, the other output of which is connected to one of. inputs of current generators, the other inputs of which are connected to the output and one of the inputs of the differential amplifier, the other input of which is connected to the outputs of the current generators and the output of the key, the input of which is connected to the second output of the control unit, an integrating element, such as a capacitor, connected between the output of the key and the bus zero potential, contains the counter, the first and the second elements AND and the element 2И-OR-NOT, the output of which is connected to another input of the modulation unit, one of the inputs of the element 2 AND-OR-NOT connected to the third output of the block control, and others are connected to the outputs of the first and second elements, one input of which is connected to the output of the differential amplifier, and the other to the corresponding output of the counter, one input of which is connected to the output of the differential amplifier, and the other to the output of the key. Figure 1 shows the functional diagram of the device; 2 and 3 time diagrams. The device contains a control unit 1, a unit 2 deflection of a beam of a CRT 3 modulation unit 4, generators 5 and 6 of current, a differential amplifier 7, an integrating element 8, for example a capacitor, a switch 9, a counter 10, elements 11 and 12, an element 13 2I -ILIB control 1 contains microcomputer 14, registers 15 and 16, and digital-to-analog converters 17 and 18. Modulation unit 4 contains absolute magnification allocation units 19 and 20, adder 21, and differential amplifier 22. CRT 3 contains a deflection system 23 and the modulator 24. the deviation unit contains amplifiers 25 and 26. The device is working AET follows. When displaying a vector, a 1-control block, in which it is under control. The computer 14 codes the projections of the vector along the X and LR coordinates are entered into the first register 16, then converted into analog form by digital-to-analog converters (D / A) 17 and 18, and fed to the corresponding deviation amplifiers 25 and 26. With the same signal of the computer 14 of the control unit 1, the line type code is entered in the second register 15, which controls the logic element 13 2I-OR-NOT with its outputs. The analog signals from the DAC 17 and 18 of the control unit 1 are fed to the input of the modulation unit 4, and from the latter to the inputs of the first and BTO-I th generators 5 and 6 of the current. Under the control of the first differential amplifier 7, current generators 5 and 6 recharge capacitor 8. First differential amplifier 7, together with capacitor 8 and first and second current generators 5 and 6, is a variable pulse generator with a frequency dependent on the signal level output modulation unit. With noMoiTjn key 9, the control unit 1 enables the operation of this generator. This signal resolves the operation of the counter 10, which begins its operation from the zero state from the signals a (Fig. 2) coming from the differential amplifier 7. The same signals are fed to the inputs of elements 11 and 12 I. To form a dashed line on the CRT screen the lines need to sum up two signals a and b (fig. 2). Logic element 12 and are used for this, and three signals a, & are formed to form a dash-dotted line. and 1 (Fig. 2). Logic element 11I is used for this. When the level of signal a coming from the first differential amplifier 7 and signal 5 coming from counter 10 to the input of logic element 12 I coincides, a signal appears at the output of the last (J (Fig. 2) When the level of the signal a coming from the first differential amplifier 7 and the signals b and 2 coming from the counter 10 to the inputs of the logic element 11 coincide, the signal B appears at the output of the latter (Fig. 2. The signals e and g c the outputs of elements 11 and 12 and fed to the inputs of the logic element 13 2I-OR-NOT, which also receives permission signals from the control unit 1, when they appear, the e or Q signals are inverted at the output of the logic element 12 2I-OR-NOT. According to which of the outputs of the control unit the resolution signal is formed, different types of lines are observed on the screen of the CRT. The table shows the possible types of vectors generated by the device depending on the state of signals 27 and 28 of block 1. In the case of inversion S, the output of the logic element 13 2И-OR-NOT is the signal Ж (Fig. 2) . Under the action of this signal, block 4 sends a deflection signal proportional to the speed of movement of the beam to the deflecting system 23 of the control system. Since the high level of the Q signal enables the backlight and the low level prohibits, then on the screen of the CRT 3 a vector is highlighted, the head louse consists of strokes of the same length despite the difference in the speeds of beam movement across the screen. Upon completion of vector processing, key 9 blocks the device until new information arrives. When inversion of signal e occurs, a signal E (Fig. 2) appears at the output of the logic element 13 2I-OR-NOT, which goes to block 4. Since the high level of the signal C enables the backlight and the low prohibits, then on the screen of the CRT 3 A dotted line type bar appears. Apparatus of the Invention A device for displaying vectors on a screen of an electron beam tube (CRT), comprising a series-connected control unit and a beam deflection unit connected to a CRT deflection system, the modulator of which is connected to one of the outputs of the modulation unit, the other output of which is connected to one of the inputs of the current generators, the other inputs of which are connected to the output and one of the inputs of the differential amplifier, the input of which is connected to the outputs of the current generators and the output of the key whose input is connected to oral output control unit, an integrating element, such as a capacitor connected between the bus and kAyucha zero potential, l and m -o sistent with. In order to expand the field of application of the device by allowing the display of dash-dotted vectors on the CRT screen, it contains a counter, the first and second elements AND, and element 2И-OR-NOT, the output of which is connected to another input of the modulation unit, the inputs of element 2I-OR-NOT are connected to the third output of the control unit, while others are connected to the outputs of the first and second elements AND, some of the inputs of which are connected to the output of the differential amplifier, and others to the corresponding outputs of the counter, one input th connected to the output of the differential amplifier, and the other - with the release key. Sources of information taken into account by the expert, 1. Patent QJA 3718834, foi. 315-22, published. 1978 2. USSR author's certificate 686041, cl. G 06 K 15/20, 1979 (prototype). ft f (od c ((/ U. 1 f f g d t Well 3 LTLrnjIJ- lЛПnПЛПЛПЛГШrlJlJ