SU1511762A1 - Device for shaping dot screen on crt-screen - Google Patents

Abstract

The invention relates to computing technology, in particular to means of displaying graphic and alphanumeric information on a cathode ray tube (CRT) screen with magnetic beam deflection. The purpose of the invention — improving the quality of solution formation by aligning the vertical video points with the same addresses in adjacent rows — is achieved by changing the speed of displaying information on the CRT screen in accordance with the current line horizontal scanning speed by introducing into the device the first 22 and second 23 shapers of compensating voltages and summing amplifier 24 corresponding to the functional links. Under the action of a signal from an amplifier 24, the frequency of the oscillator 12, which controls the speed at which the information is displayed on the screen of a CRT 1, varies in proportion.

Description

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The invention will be computed to computer technology, and to the means it has been selected graphic and letter-wise from 1 to 11 information on the screen of a CRT with (-aggregation of the beam.

The purpose of the invention is to improve the quality of shaving a raster by combining megapixes vertically on one point with one address to one in interchangeable lines about

Figure 1 shows the shape of the raster and the nature of the change in the speed of scanning the beam along the line; FIG. 2 is a block diagram of ycTpoiiCTBa. Fig. 3 are temporary diameters of the 5th voltage and current in the characteristic current devices;.,

In the device, the formation of a raster is performed (Fig. 1a) by moving the beam along the line into one and the other c j opoi-fb at the same time; - and shifting Jiy4a is a comparison of the CRT screen. At the same time, synchronously with G1 shifted beam, the information output and illumination were detouched, the current was changed, and, and the CRT in accordance with the 51 and 23 rms, in the case of ac and i-1 current in line with each other. and the scan rate of the CRT beam (figb), resulting in the bi-point n; with one and that address in the change lines, it wasn’t used per city to be on the same vertical line: oh JHI-i-HH.i, which results; Using the quality of the raster The problem of shortage, the speed of information output is changed in accordance with the speed, sweep, t ,.e. oSch.-sgliechivasht equality - t ,, f ,, 5 1 De 1; , and 1 :, - the frequency of the trace t ,,, corresponded about the Analogue of the ich one of the axis of the wasp: it is valid.

  - The device contains a CRT 1 with

lowercase 2 and .k; 1dravoy 3 coils deflection of yutey sistey l. cathode 4, formed. 11b 5 frame sweep, 6.NOK 6 n; .1m of reprogram. Pozidi -; 41-c 7-9 are marked a / .1; resny device input, BTopoi i address 5-Н5 th input of the █ and information input device.

The device also contains video yciiHHTej ib 10, fornyrovvatelt 11 addresses, consists of a generator of 12 clock pulses, a reversal counter 13 bidets in a row and a counter 14 lines in the frame, a line scanner 15

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shaper 16 signals, d. forming from one input signal si} 1 sync st15Fan in two signals ddt control two bidirectional cells; ochani 17 and 18, sources 19 and 20 of different polarity, resistor: current sensor 21, Nierva 22 and second 23 formaJQ detectors compensator D1) 1x nanr yuyyy GG., totalizer 24, nigna 25 zero note

Shaper 23 compensating nanor shenii on k.chkszhah 17 and 18 peajn-i15 zu functiondish Lee ,, d bi

Where

on line coil 2.

Shaper 23 ko. I charge dego nr uleni uU ,, on ackt; -Sh {o and sonroznavlenii line chapters 311 katu) ki 2 15ea.: 1 uet function and “G; where 1 current; its value is current ;; with rsl1 nd katugakn 2 g - ajvTHBiioe solroti ryp K catuip L 2, t;

Summarizing the bitch, the force 24 implements the sumg1 function of siggals.

syrupotseeeaner-; e, Shaper 22 and 23 and uslilitel 24 could be perfectly; and; eny on one-radio amplifiers and not; izionnyh resistOn | 5ah but standard circuits of anatugonyo: sum and curtains and signal cleaners,

The device operates on a standard basis ...

Beforehand, during the return trip of a personnel release to the memory unit 6 of the regeneration memory from the bottom of the navigation desk (not shown), in accordance with the address on input 7, the input 9 is recorded. - Kii and when dvuchenii .chucha line on one and the other side of the block 6 receives the address of the input input 8, providing output data to the video clip 10 and to the cathode 4 of the CRT 1 Formation of a code a..date reading production; .: TC in the driver 11, the clock frequency of the generator. 12 is divided into a reversible counter iB, for- ing the address of a point in a row, and in counter 14, the form number-1ru10 is the address of a string in

frame. Signals with H1Hronizadii line scan (fig.Za, b, c, g, d). coming from the output of the reversible counter 13 to the input of the driver 15,

syncs through shaper

16 working the keys 17 and 1-8 n the deviation of the CRT beam along the line. The signal si chronizatsii frame sweep, coming from the output of the counter 14 to the input of the imaging unit 5, synchronizes the sawtooth current generator and the deflection of the beam of the CRT 1 in the vertical direction to asm.

In the general case, the fast movement of the beam along the line is normal to the rate of change of current 9l / 9t in the lowercase coil 2, which is defined by the expression 91 / 9t U, / L, where L is the inductance of the lowercase trigger 2; and, | - the voltage applied to it, however, the value of / U, / during the sweep process varies relative to / E / by the value, which causes different beam speeds along the line in the segments from the middle to the edge of the screen and vice versa and causes a decrease in quality raster, Namely, with the arrival of the slice of the horizontal synchronization signal (Fig. 3a) from the output of the reversible counter 13 to the input of the imager 16, the transistor key 17 is locked (Fig. Iv). and the current in the line coil 2 decreases linearly (Fig.Zh), the circuit flows: zero potential bus - source 20 - key 18 diode (fig.G) - line coil 2 - current sensor 21 - un-Hia 25.

When the current value is close to zero, the driver 16 provides the switching on of the transistor switch 18, and the current in the line coil 2 increases in amplitude, but flows in the opposite direction along the circuit: bus 25 - source 20 - switch transistor 18 (FIG. D3) - line coil 2 - current sensor 21 —iina 25 With the arrival of the front of the synchronization signal (Fig, Over the transistor 18 is locked, and the current in the line 2 flows through the circuit: Ipsha 25 - source 19 - key 17 diode (Fig, 36) - line coil 2 is a current sensor 21. In the following stage, a current flows through the same circuit, but through a key transistor

17 (FIGS.), Etc. So, the voltage U,

Deck to a lowercase coil (figle), equal to / E | tAU. In addition, the current I, flowing through the lower-case coil, creates a drop, the voltage on the inductance U and on the active

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 resistanceL1N1 D Up Ij g (fig.Zi). 3, as a result, the voltage Ui becomes equal to /Е/+ (Л1.р-fuU ,,) U | on the site, the conduction of the diode key and Uj / E | - ((+ ig) at the conduction section of the transistor switch, As a result, the half-line at t, (Cj) is longer than at t, j (t), hence the number of video points (at a CONSTANT information output rate) half-lines will be neodingkovskoy. This disadvantage is eliminated by changing the speed of

information in accordance with the capacitance i voltage generated by shaper 22 and 23 and amplifier 24 and fed to the input of controlled generator 12, voltage i b of sources 19 and 20 and voltage 5 reduced from the nerve terminal of the horizontal coil 2 , enters the input of the for- M1raver 22, the output of which

5, the voltage u,, | (fig.ZZ),

The signal from the output of the fop D of the driver 22 is fed to the first input of summing amplifier 24, to the second input

The Q of which receives a signal from the output of the form-finder 23 of the signal & b |, in which the control signal of horizontal synchronization, coming from the counter 13, is transmitted. si: drive, s1N1meya from sensor 21

current (fig, 3g) at section t ((i;) with inverse, at section t (tj) without inversion, and scaled up (fig, 3i), the resulting signal U AU |, + + iUf, from the output of the transducer 24 is fed to the input of a frequency controlled oscillator 12, in which the activity is changed by the frequency of the generator (Fig. 3k) and, therefore, the speed of information output in accordance with 5

0

five

This is consistent with the current scan rate of the beam, which ensures vertical alignment of the points that address the same address in the contiguous lines.

A raster image using a symmetric line scan and a variable speed of displaying information on the screen eliminates the unproductive line retrace operation, reduces the power consumption by about 10 times compared to a non-pattern sweep, increases the reliability of the horizontal line former. eliminating high voltage switches, reduces the level of interferences; provides a high, raster quality.

Claims (1)

Invention Formula A device for forming a raster on the screen of a cathode-ray tube (CRT) containing a frame scanner, the outputs of which are connected to the frame coil of a deflecting system of a CRT, whose cathode is connected to the output of the video amplifier, the input of which is connected to the output of the regeneration memory block, is information and the first address inputs of which are, respectively, the information and address inputs of the device, the second address input of the regeneration unit is connected to the first output of the address generator, the second and third outputs rows of which are connected respectively to the clock shaper frame and line scans infopmatsIiOnnye input of the horizontal scanning odni- br connected to sources of different sexes .ashodov p- Nogo voltage other findings koto5xVj L „.. five 0 five 0 are connected to the zero potential bus, the output of the horizontal forcing scanner is connected to one of the terminals of the lowercase coil of the deflecting system of a CRT, the other terminal of which is connected to one of the terminals of the resistive current sensor, the other terminal of which is connected to the bus in order to improve the quality of the formation of the raster by combining the vertical video points with the same addresses in adjacent rows, the device contains the first and second formers of compensating voltages and summing the amplifier, the output of which is connected to the control input of the address driver, and the inputs to the outputs of the compensating voltage formers, the inputs of the first compensator for the former voltage are connected to one of the terminals of the alternating voltage source and the output of the horizontal formaker scanner, respectively, the second formers of the compensator voltage source and the output of the horizontal formaker scanner, the second formers of the compensator, respectively The terminals are connected to the third output of the address driver and one of the terminals of the resistive current sensor. .M. m P Vz .but P; Vcp ff FIG. one Signal Fig.Z