SU841028A1 - Device for shaping image on crt screen - Google Patents

Description

(54) DEVICE FOR FORMING AN IMAGE ON SCREEN ELECTRON-BANNER TUBE

I. 5 The invention relates to computing and is intended for use in systems for displaying information.

Devices for imaging on a CRT screen are known, comprising beam scanners in X and Y coordinates, connected to respective code registers, an element generator connected to element size codes registers and a CRT connected to a luminance modulation unit connected to a code register. luminance 1 and (2.

The disadvantages of the known devices are the lack of accuracy and the low frequency of image regeneration.

Nadboy1e close to the technical sushi. to the proposed device for forming an image on a CRT screen, containing two beam coil blockers connected to a CRT, the first register with the first outputs of the first and second elements, whose first inputs are connected to the outputs of the first trigger, the second inputs to the output of the pulses and the first input of the counter, the output of which is connected to the first input of the first comparison unit, the second input of which is connected

to the second register, and the output to the control unit, the first trigger, the second inputs of the third and fourth elements AND, the third register, the output of which is connected to the second comparison unit, the output of which is connected to the control unit whose outputs are connected to the control inputs of the first and second flip-flops, the fourth register connected to the outputs of the third and fourth elements I, the first inputs of which are connected to the outputs of the second trigger, the fifth register, the output of which is connected to the first input of the luminance modulation unit, the second input to connected to the control unit, and the output to the CRT 3.

A disadvantage of this device is insufficient accuracy.

The purpose of the invention is to increase the accuracy of the device.

The goal is achieved by the fact that the sixth and seventh registers are entered into the device - two adders, the output of the sixth register is connected to the first input of the first adder, the second input of which is connected to the first register, and the output to the first scanner of the beam, the first input of the second adder connected to the fourth register.

 the second input is with the seventh register, and the output is with the second scanner l tscha.

The drawing shows a block diagram of the proposed device.

The device contains the first register 1, the fourth register 2, the first adder 3, the second adder 4, the second element And 5, the third element And 6, the fourth element And 7, the first trigger 8, the second trigger 9, pulse generator 10, control unit 1, counter 12, first comparison unit 13, second register 14, third register 15, second comparison block 16, Brightness modulation block 17, fifth register 18, sixth register 19, seventh register 20, first beam scanner 21, second scanner 22 ray, the first element and 23.

The device works as follows

The device forms a complex halftone image from the CRT screen of rectangular elements of a given brightness. In the first cycle of the device access codes of the rectangular element X, y are sent to the corresponding registers 1, 2, 14, 15 and 18, and the codes р, q are initial the directions of the sweep of the beam along the coordinates X, Y are fed to the control unit .11. When forming the first rectangular element, the codes of differences 5l and registers 19 and 20 are not posted; however, only the X and Y codes are supplied to the inputs of adders 3 and 4, which, through the beam sweep units 21 22, install a beam on the CRT screen into the indicated starting point. The codes p, q through the control block i i set the triggers 8 to 9 to the corresponding states defining the direction of the initial sweep of the beam in coordinates X, Y. The signals of the control unit 11 are set to " O-counter 12. And trigger generator 10 pulses. Pulses from the last output go to counter 12 and to elements 23 and 5 coinciding along the X coordinate. In accordance with the code p of the initial direction of the sweep along the X coordinate, either the first element 23 and the second element 5 are prepared. Pulses c. the output of the generator 10 pulses are received through the elements And 23 or 5 on the first register 1, increasing or decreasing its contents.

The contents of the first register 1 are changed until the codes of the counter 12 and the second register 14 match. After coinciding, the first comparison unit 13 generates a signal which, through the control unit 11, turns on the pulse generator 11, reduces by one the code in the third register 15 and enters the third and the fourth elements are And 6 and 7. The signal from the output of the corresponding element And 6 or 7 changes the code 3 to the fourth register 2, exercising control on the line. At the same time, the signal from the first block 13 of the comparison step. To the counting input of the trigger 8 and. Sets it to the appropriate state. The control unit 11 is set to “O. the counter 12 and starts the generator 10 pulses. The pulses from the output of the latter come through the prepared element 23 or 5

and change the contents of register 1 of the code along the X coordinate until the codes in counter 12 and register 14 of the side code of the SW coordinate X coincide. Similarly, the second row of points of the rectangular element is formed. After forming the next line, the comparison unit 13 generates a signal that subtracts the unit in the register 15 of the side code on the coordinate and changes by one the contents of the register 2 code on the coordinate depending on the given q code of the initial direction of the beam sweep along the coordinate, shifting the beam on the next string. After forming the last line, the code in the third register 15 becomes zero and the second comparison unit 16 generates a signal

incoming to control unit 11 for interrupting the operation of the device prior to receiving the codes of the next rectangular element. In subsequent cycles of device access, codes X, the starting point of the beam sweep are not accepted, and in registers 1 and 2

the codes of the sweep end point of the previous rectangular element are stored. Sum-. mators -3 and 4 sum the indicated codes and, through the blocks 21 and 22, sweep the beam

to the point of the next formable rectangular element. At the same time, the codes A-Yt,, If go to the corresponding registers 14, 15 and 18, and the codes p, q {and the next rectangular image element are similarly formed in control block 11. After

the formation of the last rectangular element in the image regeneration cycle, all rectangular elements begin to play on the screen, starting with the first.

Claims (1)

Invention Formula A device for forming an image on the screen of a cathode-ray tube containing two beam scanners connected to a CRT, the first register connected to the outputs of the first and second elements I, the first inputs of which are connected to the outputs of the first trigger, the second inputs - to the generator output pulses and the first input of the counter, the output of which is connected to the first input of the first comparison unit, the second input of which is connected to the second register, and the output to the control unit, the first trigger, the second input. I will give the third and fourth elements And,; the third register, the output of which is connected to the second comparison block, the output of which