SU824287A1 - Device for displaying information on crt screen - Google Patents

Description

one

The invention relates to automation, computing, television reception technology, can be used in the construction of a device for displaying graphical information on the screen of a cathode-ray tube (CRT) and television receivers.

A device for displaying information on the screen of a cathode-ray tube, containing a television sensor, associated with a synchronous generator and serially connected remote control, an input unit connected to a synchronous generator, a digital code converter in a time interval associated with a synchronous generator, connected 1 m through beam scanner to CRT f.

A disadvantage of the known device is the presence of a non-linear mapping, caused both by a change in the characteristics of the elements of the device during operation, as well as by geometrical distortions of the reproduced image along each unfolded line.

It is also known a device for displaying information on the screen of a cathode ray tube, comprising a serially connected control panel, a data input unit connected to a synchronous generator and a memory unit, a digital code converter in a time interval connected to a synchronous generator, the first OR element connected to a television sensor, which connected to

a synchronous generator, a block of dynamic memory connected with a synchronous generator, a variable frequency generator and a second OR unit connected to an electron beam; tube and block

the memory, the scanner is connected to a cathode ray tube, a discriminator, and a sync generator connected to a variable frequency generator connected to memory block 2j.

The disadvantages of this device are geometric image distortions along the unwinding line caused by a non-linear relationship between the strength of the deflecting magnetic field and the amount of deflection of the point of illumination on the flat screen of the electron beam of the tube.

The purpose of the invention is to improve the image quality by eliminating geometric distortions of the reproduced image along the line unfolding the image.

This goal is achieved in that the device is connected in series with a voltage driver, the input of which is connected to the scanner, a nonlinear voltage converter and an adder connected to the discriminator and the variable frequency generator.

The drawing shows a block diagram of a device for displaying information on the screen of an electron beam I tube.

A device for displaying information on the screen of a cathode-ray tube I contains a remote control 2 connected to data input unit 3 connected to a synchronous generator 4 and memory unit 5. To the data input unit 3, a digital converter 6 is connected, the code in the time interval connected to the synchronous generator 4 and the first element 7 OR. A television sensor 8 connected to the first element 7 OR is connected to the clock generator 4. A dynamic memory unit 9 is connected to the pinch generator 4 associated with a variable frequency generator 10 and a second element 11 OR. The electron-beam tube I is connected to the second element 11 OR, associated with the memory unit 5, and to the scanner unit 12 connected to the clock generator 4. The scanner unit 12 is connected to the discriminator 13 and the voltage driver 14, which is connected to cyNMaTOpy 16. The discriminator 13 is connected to an adder 16 connected to a variable frequency generator 10, which is connected to a synchronous generator 4 and to a memory block 5. Tires 17 and 18 of communication with the computer are connected respectively to the input unit 3 and to the memory unit 5, the bus 19

Learning input is connected to the control panel 2. Bus 20 external video source connected to the first element 7 OR. An external synchronization bus 21 providing the clock signals of a television broadcast is connected to a synchronizing generator 4. A reference voltage bus 22 is connected to a discriminator 13.

When building a device for displaying information on a CRT screen, it is advisable to focus on the accepted standard of television broadcasting, therefore, the sync generator 4 can generate sync series both in standalone mode and in retransmission mode 1) from other television signal sources ( , broadcasting) on the bus 21.

Information on the screen of the cathode ray tube 1, whose beam by the beam sweep unit 12, synchronized by the synchronizing generator 4, is deployed in rows and a frame in accordance with

with a television standard, issued either directly from a digital computer via bus 17, or from a remote control 2 controls in the form of commands from keys, a light pen,

the cursor sensor, either from the television sensor 8, or from the block 5 of memory numbers, letters, symbols, formulas, scales), or from an external video signal source 20 television broadcasting).

The task of the data entry unit 3 is to provide interconnection of two Counter-flows of information - input on bus 17 and output on bus 18, differentiating them by type: intermediate memorization, generation of interruption commands, coordination of television sweep parameters with the pace of operation, of a digital computer. .

The input data block 3 generates image codes for which of the block

5, the corresponding image and the codes of reproducible values are read out, which as a result of the dynamic compensation by the scanning function in the digital code converter in the time interval

6 are converted to modulation pulses.

Claims (2)

1.Druzin Ya.Ya.d., Television Information Display Systems. 10 L ,, Energie, 1975, p. 46, fig. 15. 2. USSR author's certificate number 618768, cl. G 06 K 15/20, 1976 (prototype).