SU1387035A2 - Crt data display unit - Google Patents

Abstract

The invention relates to the field of computer technology and can be used in the construction of information display devices on cathode ray tubes (CRT), for example, in television systems of television and television projection and in automatic television systems. The purpose of the invention is to increase speed and improve the quality of the displayed information due to the possibility of fine-tuning the raster definition. The invention automatically controls the process of finding and calculating the magnitudes of several individual constituent correction signals required for optimal correction of astigmatism and dynamic focusing. To search for and determine the values of the individual component signals of the core in separate areas of the raster, which provide optimal correction, the photoelectric converter 17 serves

Description

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which is a signal from a CRT 1 light spot, correction signal calibration block 18, control pulse driver 19, registers 22 and 23, additional adders 20, 21 and 24, counter 25, decoder 26, and block 27 containing bits for each correction signals. The discharge of the correction signal is used in searching and determining the values of all the components in turn, and the discharge of the constant component is used to supply the signal of this component and the test signal from the output of the block 18 to the amplitude and polarity adjustment block 10 via the adder 24. components and further into the correction system, since for the extreme points along the raster axis, the value of the correction signal found for the raster center should be taken into account. Peak detector in block 18 monitors schag for schagom for the minimum signal from this raster point. When it is detected in the cell of block 27, the found parallel code is stored for three correction currents, then the signal is fed to the digital-to-analog converters of block 10 and further to corrective windings 3 of CRT 1. Cells in block 27. 2 h are provided for setting the components for individual raster angles. P. f-ly, 3 ill.

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The invention relates to computing, can be used in the construction of information display devices on cathode ray tubes, for example, in television systems of telekinetic projection and in automatic television systems where high image quality is required, in particular, for example, in equipment for collecting, displaying . Neither information processing at meteorological studies and investigations of the Earth’s natural resources is the improvement of the device according to the author. St. No. 744673.

The purpose of the invention is to increase speed and improve the quality of the displayed information due to the possibility of fine-tuning the raster definition.

FIG. 1 shows a functional diagram of the device; in fig. 2 - functional block correction signal calibration block; in fig. 3 is a functional diagram of a control signal generator.

The device contains a cathode-ray tube (CRT) 1, power supply unit 2, corrective winding 3 ETL, focusing and deflecting system 4 CRT, sources 5 and 6 of the centering and focusing current of the raster, generators 7 and 8 frame and line scanning, functional the converter 9, the amplitude and polarity adjustment unit 10, the blocks 11 and 12 of the summation and amplification of the correction signals, the integrator 13 and the first adder 14. The device has an input 15 which is used to initialize the device. The amplitude and polarity adjustment unit 10 of the correction signals contains digital-to-analog converters (made in the form of multiplying DACs), and their number corresponds to the number of component correction signals. CRT 1 has an optical output of 16.

The device also contains a photoelectric converter 17, a correction signal calibration block 18, a control signal generator 19, a first 20 and a second 21 additional adders, a first 22 and a second 23 registers, a third auxiliary adder 24, a counter 25, a decipher 26, a block 27 a buffer memory that stores each component of the correction signals, bit 28 for storing a correction test signal used in searching and determining alternately all values

5 components of the correction signals, bit 29 for storing the constant component of the correction signal in the center of the raster. The correction signal of this component is fed from the first output of the 27-bit 28 test signal. Discharge section 29 is used to feed, through the adder 24, a signal of this component and a test signal from the first output of block 18 to block 10 and blocks 11, 12, 3 and 4 when building component values

g correction signals for the extreme points along the axis X (Y) of the raster, since for these points the value of the correction signal found for the center of the raster must be taken into account.

The signal zeroing on the counter 25 and the block 27 is filed with the output of the driver 19. Block

0 18 calibration of the correction signals contains the elements And 30 and 31, trigger 32, gay. pulse puller 33 and peak detector 34. Control signal generator 19 includes switches 35 and 36, reference voltage source 37, comparator 38,

5, the first element AND 39, the comparator 40, the clock pulse generator 41, the second element AND 42, counters 43 and 44, the decoder 45 and the multivibrator 46. In addition, the driver 19 has a constant voltage bus 47.

The device works as follows.

When a signal is received from the former 19 to the counter 25, it is zeroed and prepared for the tuning process. Under the action of the signals from the generator 7 and the adder 14 on the synchronous inputs of the imaging unit 19, the latter, in accordance with the location of the electron beam of the CRT 1 in a certain area (point) of the raster, starting from the center, generates control signals and setting pulses appear at its outputs

the values of the data components of rutting signals in block 10.

corrections10

Then the tuning cycle begins for the other components of the three correction currents — the first and second degrees of the deflection signals along the X (Y) coordinate, i.e. for each of the two extreme points along the axis X (Y) of the raster. In this case, signals are generated to prepare the next cells in block 27, and the same signal is used to overwrite the detected test signal from bit 28 to bit 29 of the constant component. In this tuning cycle, the enumeration of the component magnitudes for the three currents

which are fed to the counter 25 and the correction block 27, 15 (signals from the generator 33) and the control signals for the block 18. With each setting pulse, the state of the counter 25 changes and is respectively prepared through the decoder 26 in the block 27 to receive information

is also produced by stepwise changing the test signals added to the output signal of the discharge 29 constant component in the adder 24, the signal from the output of which is fed to block 10 at the inputs

certain cell From the output 16, the light 20 of the corresponding digital-analogue presets from the spot on the screen of the CRT 1 at the selected raster point is converted in converter 17 and fed to the information input (bit 28 of the test signal) in the block

giver for these components. For the top axial point of the raster, the detected code signal from the signal of the detector 34 is fed to register 22 by turning on

27 and two elements: And 30 and 31 and further by 25 according to the signal from the driver 19 elements of the register 22 (23) under the action of the control of the ----- signals from the trigger 32. From the generator 33 test signals on the command from the driver 19 parallel codes for the three correction currents (astigmatism and DI 30 are stored there. Then, for the lower axial point of the raster, a test signal is rearranged step by step and a minimum of the signal from the converter unit 17 in the detector 34 is detected by another codonamic subfocusing) which is a signal nformatsionnye inputs of registers 22 and 23 unit 27 (discharge 28) and to the adder 24. The peak detector 34 monitors step by step from the minimum signal for the given raster point where another test signal passes

By means of the signal from shaper 19, detector 34 is sent to second register 23 through the second element. At the same time, from the outputs of registers 22 and 23, code signals are fed to their processing to adders

into bit 28, as well as into block 10 through the adder 35 20 and 21. The code signals from the outputs of the register 24, the second input of which does not contain any signals, since the signal at the second output of the block 27 (constant bit 29) to zero. By a test signal in block 10, the slit after the slit sets a new combination of component values for the three correction currents and, accordingly, the currents in the winding 3 and in the coil (not shown) of the dynamic focusing in the focusing-deflection are automatically adjusted to 40

The ditch 22 and 23 already correspond to the magnitude of the components of the first and second degrees of the signal deviation along the Y coordinate. These signals are simultaneously fed from the outputs of registers 22 and 23 through the adders 20 and 21 to the corresponding bits of the block 27, are recorded by the adjusting signal from the former 19 supplied to block 10 and further to the correction system, thereby additionally adjusting the currents in the winding

4. The system is the most tunable 3 and the focusing-deflection system 4.

Similarly, the calculation is automatically performed in adders 20 and 21 of the values of the components of the first and second degrees of the deviation signal along the X coordinate for the extreme axial points along the X axis of the raster and they are fed

the shape of the spot at a given raster point, and therefore, the signal at the input of the peak detector 34 varies accordingly.

Upon detection of the minimum of this signal in the peak detector 34 measurement

the degree of distortion of the spot shape in block 18 50 simultaneously with the outputs of the adders 20 and ends, while in the discharge section 28 of the block 27 the found parallel code of the component definition correction signals in the center of the raster for the three correction currents on the signal from the detector 34 is stored. in the regime close to saturation, 55 the minimum of the signal corresponds to the least distorted, i.e. round, the shape of the spot, indicating the correct setting

21 to the corresponding cells of the block 27 prepared for them and then through the block 10, the currents in the winding 3 and the system 4 are additionally adjusted. The cells of the block 27 are prepared in two cycles, the cell is not prepared in the first cycle, and two cells are prepared in the second cycle (for example, second and fourth, then first and third).

the values of the data components of rutting signals in block 10.

corrections

Then the tuning cycle begins for the other components of the three correction currents — the first and second degrees of the deflection signals along the X (Y) coordinate, i.e. for each of the two extreme points along the axis X (Y) of the raster. In this case, signals are generated to prepare the next cells in block 27, and the same signal is used to overwrite the detected test signal from bit 28 to bit 29 of the constant component. In this tuning cycle, the enumeration of the component magnitudes for the three currents

Corrections (signals from generator 33) are also produced by stepwise changing test signals added to the output signal of discharge 29 of the constant component in adder 24, the signal from whose output is fed to block 10 at inputs

corresponding digital-to-analog converters for these components. For the top axial point of the raster, the detected code signal from the signal of the detector 34 is fed to register 22 by turning on

 by a signal from the imager of the 19 elements ---- by a signal from the imager of the 19 elements ---- And 30 and is stored there. Then, for the lower axial point of the raster, the test signal is rebuilt step by step and, by the minimum of the signal from the converter unit 17, another generator signal code 33 is detected in the detector 34, which is supplied to the second register by the signal of the detector 34 through the second element 31 through the signal from the former 19 23. At the same time, from the outputs of registers 22 and 23, the code signals are fed for processing them to adders

 20 and 21. Code signals from the outputs of register 40

The ditch 22 and 23 already correspond to the magnitude of the components of the first and second degrees of the signal deviation along the Y coordinate. These signals are simultaneously fed from the outputs of registers 22 and 23 through the adders 20 and 21 to the corresponding bits of the block 27, are recorded by the adjusting signal from the former 19 supplied to block 10 and further to the correction system, thereby additionally adjusting the currents in the winding

dd 3 and focusing-deflection system 4.

simultaneously with the outputs of the adders 20 and

21 to the corresponding cells of the block 27 prepared for them and then through the block 10, the currents in the winding 3 and the system 4 are additionally adjusted. The cells of the block 27 are prepared in two cycles, the cell is not prepared in the first cycle, and two cells are prepared in the second cycle (for example, second and fourth, then first and third).

Four separate cells of block 27 are used for a separate quadrant (angle) of the raster. When setting up the XY components for a separate raster angle, the device works in the same way as setting the constant component, but the found optimum code signals are recorded in their own separate cell of block 27. Then, using the signal from the former 19, the generator 33 is zeroed and the correction signal, already exactly corresponding to of this cell block 27 passes through the adder 24 to the corresponding input of block 10. For the constant component in block 10 at the initial setup (input 15) of the device, the operator has set vaets inlet corresponding DAC lishch some initial reference voltage (initial focus). The analog signals of the functions corresponding to the other components of the correction signals are fed to their DACs in block 10 from the outputs of the function converter 9, while the other inputs of these DACs are fed from the outputs of the bits of the block 27 to the code signals determining the optimal value of the corresponding components of the correction signals. . Thus, the constant and the first and second degrees of the deflection signal components of the signal correction are introduced into the currents flowing in the winding 3 and the system 4. This completes the definition of the raster field and the device is ready for operation. In the Operation on the quad switching signal generated in the functional converter 9, for each of them separately connect the output of the corresponding of four separate digital-to-analog converters, each connected to its own separate cell of the block 27, and from the output of the block 10 the current in the winding 3 is additionally adjusted and thereby, an optimum adjustment of the definition in each given raster quadrant is realized. It does not require a long time during the initial setup or during the operation of the device, manually adjust each of the several component correction signals.

The proposed device adjusts automatically and with high speed, which significantly speeds up the process of adjusting the definition and automatically maintains the same sharpness in the corners of the raster as in the center of the raster, and thus ensures high image quality.

Claims (3)

1. A device for displaying information on the screen of a cathode ray tube (CRT) according to the author. St. No. 744673, characterized in that, in order to increase the speed VIA and improving the quality of the displayed information due to the ability to fine-tune the raster definition, it contains a photoelectric converter optically connected to the CRT screen, a driver of control signals, the clock inputs of which are connected to the outputs of the frame scan generator and the main adder, respectively, the calibration unit of the correction signals, information whose entrance connected to the output of the photovoltaic converter, and the control inputs, respectively, with the first and second outputs of the driver of the control signals, two registers, a block of buffer memory, three c - additional adders, a counter and a decoder, the information inputs of which are connected to the outputs of the counter, the counting input of which is connected to the third output of the driver of control signals, the fourth output of which is connected to the inputs 0 reset the counter and the buffer memory block, the control inputs of the group of which are connected to the outputs of the decoder, the first output of the calibration block of the correction signals is connected to the information inputs of the first and second registers, the third additional adder and the buffer memory block, the control inputs of the second and third registers connected respectively with the second and third outputs of the calibration block of the correction signals, the fourth output Q whose is connected to the control input of the buffer memory block, the output of the first register is connected to the first information inputs of the first and second additional adders, the second information inputs of which are connected to the output of the second register, the outputs of the first and second additional adders are connected to the information inputs of the first group of the block the buffer memory, the first, the output of which is connected to its information inputs of the second group, the second output of the buffer memory block is connected to the second information input, the third of additional adder and a third output - with the first data input of the amplitude adjustment block and polarity upravg l yuschy input of which is connected to the output of the third adder and the second data input - output of the fourth function converter. 2. The device according to claim 1, characterized in that the correction signal calibration block 0 contains two AND elements whose outputs are the second and third outputs of the block, respectively, the first inputs of the AND elements are the fourth output of the block and connected to the output. peak detector, the second inputs of the elements And are connected to the first 5 and two outputs of the trigger, respectively, the first input of the peak detector is the information input of the block, the second input of which is connected to the input the pulse generator whose output is the first output of the block, the trigger inputs and the pulse generator are the control inputs of the block. 3. The device according to claim 1, characterized in that the driver of the control signals contains two switches, the control inputs of which are connected to the output of the source of the reference voltages, the information inputs to the output of the decipher, and the outputs to the first inputs of the first and second comparators, respectively, the second inputs of which are the synchronizer inputs of the generator, and their outputs 25.27 with the inputs of the first element And whose output is connected to the first input of the second element And whose second input is connected to the output of the clock generator, the output of the second element And is connected to the counting input of the first counter and is the first output of the driver, the output of the first counter is second and the fourth outputs of the imaging device - and connected to the counting input of the second counter, the output of which is connected to the input of the decoder, and the waiting multivibrator, the input of which is connected to the constant voltage, and the input is the third exit shaper. FIG. 2 74