SU1578738A1 - Device for presentation of information on screen of cathode-ray tube - Google Patents

Abstract

The invention relates to automation and computing and can be used to display information from a computer. The purpose of the invention is to improve the accuracy of the device by introducing a node 14 for generating signals for recording correction factors, made in the form of a calibration mask consisting of successively located first flat metal electrode 23 in which holes, photoconductive layer 24 and second flat metal electrode 25 are made corresponding functional relationships. The invention provides a reduction in size, weight and increase the accuracy of the device. 2 Il.

Description

24

25

X, Y

WITH

Calibration

Fig 1

The invention relates to automation and computing and can be used to output information from a computer, for example, in microfilming devices.

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

Figure 1 shows the block diagram of the device; figure 2 - structural diagram of the generator raster scan.

The device has the first information input 1, the first control input 2 and the second control input 3.

The device contains register 4, corrector 5 coordinate distortion, the first 6 and second 7 multiplexers, block 8 digital-analog converters, cathode-ray tube (CRT) 9, trigger 10, raster sweep generator 11, adder 12, memory block 13, a node 14 for generating signals for recording correction factors in the form of a calibration mask controlling the output 15.

The raster scan generator 11 comprises a clock pulse generator 16, counters 17 and 18, control input 19, first 20, second 21 and third 22 outputs.

The calibration grid of the assembly 14 consists of the first flat metal electrode 23, the photoconductive layer 24, the second flat metal electrode 25, and the bus 26 of the reference voltage (E).

In the case of zone correction, the 5-coordinate distortion corrector is an adder.

In the general case, the structural scheme of the corrector when using other methods of correction (for example, the zone-interpolation method, etc.) may differ from the given scheme; therefore, it is highlighted in the general structural diagram of the proposed device as a separate structural element of the general form.

The device works as follows.

In the initial state, trigger 10 (Calibration mode) is in the reset state, the first and second multiplexers 6.7 are switched on to pass to the output of signals from the first inputs, the raster scan generator 11 is blocked and is not working.

The operation of the device is stimulated by the arrival at input 3 of the pulse of the installation of the trigger 10 in a single state corresponding to the Calibration mode. In this case, the raster scan generator 11 is activated, the first 6 and second 7 multiplexers are switched to transmitting signals to the outputs from the second inputs. Codes

The X, Y coordinates of the raster scan points from the first and second outputs of the generator 11 pass through the first multiplexer 6 to the inputs of the block 8 of digital-to-analog converters. The analog signals of the deviation of the beam of the CRT 9 from the outputs of the block of 8 digital-analog converters provide the formation of a raster scan on the screen of the CRT 9,

0 When calibrating on the screen of the ECL unit, the node 14 for generating the signals for recording the correction factors is calibrated on the mask.

Electrode 23 facing CRT screen

5 9, is made with translucent holes located at the calibration points, and is connected to the recording control input of the memory unit 13, the second electrode of the calibration mask is connected to the bus

0 26 external stress (E).

In the process of raster scanning, the light spot alternately enters all the holes of the calibration mask. When a light spot enters the hole in the chain

5, the reference voltage bus produces a photoconductivity current, which is a signal that detects the fact that the light spot has entered the calibration point. This signal is removed from the mask electrode 23 and

0 is fed to the recording control input of the memory block 13.

From the first output of the raster scan generator 11, the address inputs of the memory block 13 receive, through the second multi 5 plexer 7, the higher-order bits of the coordinates of the raster scan points, which determine the code for the calibration area of the working floor of the CRT screen 9. The calibration holes of the mask are located

0, the calibration area codes and the addresses of the memory cells are the codes of the calibration holes.

Adder 12 performs subtraction (addition in additional code) from codes

The 5 lower bits of the raster scan points of the codes of the lower positions of the coordinates of the calibration holes (constant at the first information input of the adder 12, which is determined using a microscope for a specific calibration mask). At the output of the adder, codes of deviations of the coordinates of the current point of the raster scan from the coordinate of the calibration hole of that calibration zone are generated,

5 in which the current raster point is located. From the output of the adder, these deviations arrive at the information input of the memory block 13. Thus, the pulses arriving at the write control input of the memory unit 13 when the light spot of the raster scan hits the calibration holes, are written into cells whose addresses are hole codes, deviations of the coordinates of the current raster point from the nominal values of hole coordinates,

At the end of the raster scan frame, at the third output of the raster scan code generator, a pulse is generated, by which the trigger 10 switches to the zero state. In this case, the raster scan generator 11 is blocked, and the first 6 and second 7 multiplexers are switched to transmit the data arriving at their first inputs. With this, the device operation in Calibration mode ends, and it goes into the Operation mode.

In Work mode, the calibration mask is removed from the CRT screen. A write pulse at control input 2 records the X, Y coordinates of the displayed point from input 1 to register 4. The high and low bits of the X, Y coordinate codes are sent to the first and second inputs of the equalizer 5 coordinate distortions. The first input of the second multiplexer 7 from the first output of register 4 receives the highest bits of the coordinate codes of the point X, Y, which from the output of the multiplexer arrive at the address inputs of the storage device. At its output, a deviation correction recorded in the Calibration mode appears, which is fed to the third input of the equalizer 5 coordinate distortions. The corrected values of the coordinate codes Xk, YK from the output of the corrector through the first multiplexer 6 are fed to the inputs of the block of digital-to-analog converters,

There they are converted into analog signals and fed to the deflection system of a CRT. A point with X, Y coordinates at the input of the device is displayed on the CRT screen.

By sequentially writing to the register 4 of the coordinates X, Y, information is output on the screen of the CRT.

At the end of the information output, the device is in the initial state and the pulse at input 3 can be switched back to Calibration mode.

Introduction to the output device of the calibration mask provides, in comparison with the prototype, a reduction in size, weight and an increase in accuracy, since the calibration mask is a flat design with dimensions equal to the screen area of the device being calibrated.

Improved calibration accuracy due to the efficient use of the light flux of the light point due to direct contact

masks with a screen and eliminate losses in the optical projection system.

Claims (1)

Invention Formula Device for displaying information on a cathode ray tube (CRT) screen containing a register, a coordinate distortion corrector, first and second multiplexers, a digital-to-analog block converters, trigger, raster scan generator, adder, memory unit, whose address input is connected to the output of the second multiplexer, the first information input of which connected to the first register output connected to the first information input of the coordinate distortion corrector, the second information input of which is connected to the second register output, the information and control inputs of which are the first information and first control inputs of the device, respectively, the information input of the RAM block is connected with exit an adder, the first information input of which is the second information input of the device, the output of the RAM block is connected to the third information input of the coordinate distortion corrector, the output of which is connected to the first information input of the first multiplexer, the second information input of which is connected to the first and second outputs of the generator raster sweep, the third output of which is connected to the input of the installation of the trigger, the output of which is connected to the control inputs of the raster scan generator, pew and second multiplexers, is the control output of the device, the input of the setup 1 trigger is the second control input the inputs of the second multiplexer and the adder are connected respectively to the first and second outputs of the raster scan generator, the output of the first multiplexer is connected to the information input of the digital-to-digital block s transmitters, the outputs of which are connected to the CRT deflection yoke of m- lichayuschees in that, in order to increase the accuracy of the device, it osoderzhit signal generating unit records the correction coefficients, embodied in the form a calibration mask consisting of consecutively located first flat metal electrode in which holes are made, a photo of the conductive layer and a second flat metal electrode that is connected to the reference voltage bus, the first flat metal is connected to the control input of the record, the blued electrode is reinforced on the screen of a CRT and a memory. nineteen , P  22 J11 20 Photo.1