SU1156121A1 - Device for displaying information on screen of "densitron"-type cathode-ray tube - Google Patents

Abstract

DEVICE FOR DISPLAY MFORMATSSH ON A cathode ray tube TYPE DENSITRON (CRT type densitron) comprising a timing generator connected to a scanner, the output of which is connected to the deflection system CRT type densitron, plotnostyo electronic onion control node sredinenn yield video amplifier whose input is the input of the device, which is so that, in order to simplify and expand the field of application of the device by ensuring the work in television mode, it contains Connections sawtooth generator having an input podksh chen a timing generator, an amplifier and an additional deviation, n guide system mounted between: deflection system and audio node upravlet density electron beam of CRT type densitron. WITH

Description

ate

A) The invention relates to automation and computing and can be used in television monitoring and display devices. A device for displaying color information on a screen of a color mask kinescope is known, which contains a synchronous generator, a scanner, a mask color CRT, a deflection system, a video amplifier and a power source lj. A disadvantage of this device is the low quality of the color image under the conditions of mechanical and magnetic effects. The closest in technical essence to the present invention is an information display device comprising a densitron type cathode ray tube. This device contains a densitron type CRT, a synchronous generator connected to a scanner, the output of which is connected to a deviating CRT system, a video amplifier, the output of which is connected to a CRT electron beam control unit and a power source and operates as a display device for color information with functional sweep 2. A disadvantage of this device is its complexity and high power consumption due to the use of functional scans. The aim of the invention is to simplify and expand the field of application of the device by providing operation in television mode. In a densitron type CRT, for one of the colors of the luminescence, it is necessary to have a high beam current density in each image element, which in television mode, especially for large sizes of CRT diagonals, cannot be achieved by known methods. The goal is achieved by the fact that a device for displaying information on the screen of a cathode-ray tube of the densitron type (CRT of the densitron type), containing a synchronous generator connected to the ravervok unit, the output of which is connected to the densitron CRT deviating system of the electron beam density control unit, with the output of the video amplifier, whose input is with the input of the device, a series-connected saw-tooth generator, the input of which is connected to the clock generator, an amplifier and an additional deflection system installed between the deflection system and the density control unit of the electron beam of a CRT of the densitron type. The drawing shows a block diagram of the proposed device. The device contains a synchronous generator 1, a scanning unit 2, a video amplifier 3, a sawtooth voltage generator 4, an amplifier 5, a deflecting system 6 of a densitron type 7 densitron, an additional horizontal deflecting system 8 of a CRT, power supply 10, an input 11 and output 12. Synchronizer 1 consists of a master oscillator, frequency dividers, shapers of lower case synchronization pulses (FID), frame synchronizing impulses (XI), various clock pulses and service signals. Scanning unit 2 consists of line and frame sweep generators, output stages, the load of which is deviating system 6 of CRT 7. The scanner unit is synchronized by SI and XI pulses of synchronous generator 1 .. Video amplifier 3 consists of a preamplifier and output voltage amplifier The load of which is the electron beam density control unit 9 of a CRT 7. A densitron type CRT 7 produces color due to a change in the intensity of the electron beam. The electron beam density control unit 9 is a modulator or cathode of a CRT 7. Power supply 10 consists of voltage sources that ensure the operability of the proposed device, for example, +5, +10, +50 V and +1, +15 voltages. kV for CRT 7. Input 11 is supplied with a video signal from an external device (not shown in the drawing). From the output 12 from the clock 1 to the external device receives clock pulses and service signals.

The device works as follows.

When power supply 10 is turned on, sync generator 1 and all units of the device begin to work. The signals of the FID and the FID synchronize the operation of the scanner 2, which with the help of the deflecting system 6 ensures reproduction of the image on the screen of the CRT 7. The external video signal received from the input 11 through the video amplifier 3 provides the CRT 7 with the help of the node 9 to control the density of the electron beam using a CRT modulator 7, obtaining a color on a CRT 7 screen such as a densitron.

The reference frequency coming from the master oscillator of the synchro-generator 1 is fed to the input of the saw-tooth generator, a voltage. The reference frequency is synchronous to the synchronization pulses of the FID and XSI of the scanner unit 2.

If, for example, the reference frequency is 10 MHz (the pulse duration is, for example, 50 ns, the next period is 100 nons), then the 4th sawtooth generator 4 provides a saw with a duration of 50 ns with a pause also equal to 50 NN.

The sawtooth voltage from the output of the generator A of the sawtooth voltage is fed to the input of amplifier 5 and then to the input additional deviation to the circuit system 1 18, which ensures the deflection of the beam in the horizontal direction and opposite in the direction of the main horizontal scan of the deflecting system 6 of the CRT 7.

Thus, for example, at a reference frequency of 10 MHz during the forward run of the line scan (fcrp ° 15625 kHz, Tnpxoi, μs), the electron beam of the CRT will stop 512 times and for the whole frame (in the event with reverse moves along the line and frame) equal to 20 ms, 200 thousand times.

The reference frequency, also supplied from the sync generator 1 through output 12, provides in the external device the formation of a video signal input to input 11 of the proposed device synchronous with the stopping of the CRT beam 7. Providing in the proposed device a high density beam of the CRT 7 of the densitron type produces a color image when The speed of a CRT beam exceeding 2 mm / MKS in TV mode with a horizontal scan length of more than 100 mm along the line.

The introduction of a sawtooth voltage and additional deflector plates into the generator device allows switching to television mode of operation, as this reduces the speed of the beam to zero at the times corresponding to each element of the line.

Claims (1)

DEVICE FOR DISPLAYING INFORMATION - ON THE SCREEN OF ELECTRON BEAM TUBE TYPE DENSITRON (type densitron CRT), containing a clock generator connected to a scan unit, the output of which is connected to the deflector system of the type densitron CRT, the electron beam is connected to the control unit with a density control unit video amplifier, the input of which is the input of the device, with the fact that, in order to simplify and expand the scope of application of the device by ensuring operation in television mode, it contains sequentially Connections sawtooth generator having an input connected to a clock generator, an amplifier and an additional deflection system disposed between the deflection system and the control node density electron beam of CRT type densitron, (19) _