SU1023388A1 - Device for displaying information onto crt screen - Google Patents

Description

10 The invention relates to computing and can be used when displaying a graphical information on a screen of an electron-louvian tube (CRT). Devices are known; for displaying information containing a CRT, sweep generator, symbol generator, switchboard and coordinate counter, X and Y SP. . However, these devices do not provide a high "1Area for display due to the nonlinearity of scan generators and CRTs. The closest in technical essence to the present invention is a device for relaying information on a CRT screen, containing a switch, a scan generator and a linear beam transducer associated with input switch 23; The disadvantage of this device is the low accuracy of the mappings due to the presence of non-linearities in the beam motion; around the screen .; The purpose of the invention is to improve the accuracy of the device by taking into account the position of the beam on the CRT screen. This goal is achieved by the fact that in a display device and a formation on a CRT screen, containing generators of horizontal and vertical scanning, connected to deflecting systems of a CRT, and a switch, one of the inputs of which is an input of the device, and an output connected to a modulator The CRTs, the first and second blocks of nonlinearity, are introduced, the inputs of which are connected to the generator of the horizontal and vertical sweeps, respectively, and the outputs — to other inputs of the switch. FIG. 1 shows a block diagram of the device; in fig. 2 is an example of a displayed rectangle on a CRT screen; in fig. 3 is an example of a switch block diagram for displaying a rectangle; in the year - the graph of nonlinearity; in fig. 5 - prin, nonlinearity block scheme. The device contains a CRT 1, a switch 2, the output of which is connected to a modulator, 3 CRTs, a vertical scanning generator k and a horizontal scanning generator 5, the outputs of which are connected respectively to personnel 6 and horizontal 7 deflection systems and respectively to the first 8 and the second 9 nonlinearity blocks, and the outputs of the 8 9 nonlinearity blocks are connected to the switch 2. The input of the switch 2 receives signals corresponding to the displayed graphic information from the input of the device. The device works as follows. When the supply voltage is applied, framing k and lower case 5 scans start working, generating signals that allow the beam to move along the CRT screen in the form of a raster. The coordinates of the electron beam on the surface of the screen with the output signals of frame generators i and lower case 5 sweeps are determined by the functional dependencies X f (Y f, (Uc), where X is the coordinate characterizing the vertical position of the beam; Y is the coordinate characterizing the position of the beam horizontally, and - the output signal of the vertical scanning generator U; the output signal of the horizontal scanning generator 5. The signals UQ can be in the form of voltage (in the case of using a CRT, with electrostatic deflection) and then (a CRT with magnetic deflection). Per. g the second 9 nonlinearity blocks provide transformations of the input signals U., and U, in accordance with expressions V d a. (where K and K 27 are the scales for representing the coordinates of the electron beam as signals and U at the outputs of the first and second blocks 8 and nonlinearity 9. Then, -; KJ, i.e., the relationship between the position of the beam on the CRT screen and the signals taken from the outputs of the nonlinearity blocks is directly proportional to each position of the beam on the screen of the CRT screen 1 only exits lane 8 and the second 9 nonlinearity blocks, i.e. the output signals 8 and the second 9 nonlinearity blocks are the coordinates of the beam on the CRT screen plane. The signals arriving at the input com || of the ftator 2 ,. carries information about the configuration of the displayed objects in the form of. coordinates of points, their mappings. When these coordinate signals coincide with the signal-coordinate, the formation of the outputs at the outputs of the first 8 and second 9 nonlinearity blocks and corresponding to the actual position of the beam on the SLT I plane, the coupler produces a signal that controls the beam intensity and the CRT 1 The device of the input switch 2 is determined by the nature of the information displayed. For example, to get an image of a rectangular configuration (Fig. 2} input) and an actor, four diagrams of 10-13 can be contained (Fig. 3). whose outputs are connected to in; The signals of the nonlinearity blocks 8 and 9 are fed to one of the inputs of the cpu 1i circuit, and the signal corresponding to the coordinates of the edge of the rectangle is fed to the other. The first. The second and second nonlinearity units can be executed, according to the datasheet given in FIG. 5. To calculate the circuit elements, it is necessary in accordance with FIG. 5 approximate the functional dependence of f or f by a polyline, the number of segments of which is determined by the required accuracy (it determines the number of variable resistors). The slope of each piece of harvkte:,. The risks are determined by the value of constant (} resistors. As a result, the element V, controlled by the CRT bone, would be driven at the entrance of the beam to the area deviated by the input signals. and CRT, thereby increasing the accuracy of the display, and, moreover, for a given accuracy from one day, it performs less accurate and, therefore, less expensive scan generators and CRT ..

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Claims (1)

DEVICE FOR DISPLAYING INFORMATION ON THE ELECTRON-BEAM- SCREEN; VOY TUBE (CRT) containing. Line and frame scan generators connected to the deflecting CRT systems, and a switch, one of the inputs of which is the input of the device, and the output is connected to the CRT modulator, as a result that, in order to improve accuracy, it contains the first and second blocks of nonlinearity, the inputs of which are connected with a line or frame scan generator, respectively, and the outputs with other inputs of the switch. (L about r oo 00 00 1 1023388 2