SU723625A1 - Device for displaying information on crt screen - Google Patents

Description

(54) DEVICE FOR DISPLAYING INFORMATION

ON THE SCREEN E. PECTRONIC BELL PIPE

The invention relates to automation and computing and can be used to create video terminal devices equipped with a light pen. A device comprising a marker length setting unit connected through a beam deflection unit with a beam position unit and a CRT brightness control unit connected to a brightness control unit and a beam position unit, a light pen connected with a beam return unit to the center is known. the marker and through the information update block with coordinate blocking, the synchronization block, connected through the switchboard to the beam deflection unit by one step of the discrete raster, the discrete direction block, and the beam returning center to the center Kera 1. The disadvantage of this device - not high precision. The closest technical solution to the invention is a graphic data display station, containing an input register connected to the control unit, as well as directly and incrementally through registers. Research institutes to adders whose outputs are connected to absolute transducers through the corresponding keys, a control unit connected via a light-pen to a light pen, through a lighting unit to a CRT cathode, to adders, keys, increment registers and control inputs the increment converters, the increment registers are connected to the digital inputs of the increment converters and compensating converters, the outputs of which are connected to the first input of the corresponding amplifiers, the second input of which is connected to the outputs with otvetstvukitsih abS0LYuTNYH increments converters and inverters, and an output - to the yoke 2. This device has insufficient accuracy of finding the position and the low speed of movement across the screen Oriel. The aim of the invention is to improve the accuracy and speed of the device. The goal is achieved by the fact that the device containing the input register, whose input is the information input of the device, and the output is connected to the first input of the control unit, to the first inputs of the first and second increment registers and to the first inputs of the first and second adders, the second inputs of which connected to the second inputs of the first and second increment registers, to the first inputs of the first and second digital-to-analog converters x and Y, to the first output of the control unit and to the first input of the backlight unit, the second input of which is soy It is connected to the output of the light fixing unit of the Math and to the second input of the control unit, and the output of the subovet unit is connected to the modulator of the electron-beam tube, the deflection system of which is connected to the outputs of the first and second amplifiers of the deviation, the first inputs of which are connected to the outputs of the third and fourth digital-analog converters, the inputs of which are connected to the third inputs of the first and second adders and the second inputs of the first and second digital-to-analog converters, the outputs of which are connected to the second inputs first and second variance amplifiers with outputs of the fifth and sixth digital-analog converters, the inputs of which are connected to the outputs of the first and second keys, the first inputs of which are connected to the first output of the control unit, and the second inputs to the outputs of the first and second adders, the second output of the control unit is the device control output, contains the first and second absolute coordinate registers, the first and second data registers, the first and second shift registers, and the comparison unit, the output of which is connected to the third the input of the control unit, and the first and second inputs of the comparison unit are connected to the inputs of the third and fourth digital to analogue converters and to the outputs of the first and second shift registers, the first inputs of which are connected to the input of the backlight unit and the second inputs to the outputs of the first and second increment registers the outputs of the first and second registers; absolute coordinates are connected to the fourth inputs of the first and second summers, the first inputs of the first and second registers of absolute coordinates are connected to the first inputs of the first and second data lines, the second input of which is connected to the second inputs of the registers of absolute increments and to the outputs of the first and second adders, and outputs are informational outputs of the device.

The drawing shows a block diagram of the proposed device.

The device contains a control unit 1, an input register 2, first and second registers 3 and 4 increments, the first and second adders 5 and 6,

the first and second keys 7 and 8, the first, second, third, fourth, fifth and sixth digital-to-analog converters 9-14, the first and second amplifiers 15 and 16 of the deviation, the deflection system 17 of the cathode ray tube, the cathode ray tube 18, the backlight unit 19, block 20 new the first and second shift registers 21 and 22, the first and second registers 23 and 24 of absolute coordinates, the first and second registers 25 and 26 of data, block 27 comparison.

The device works as follows.

5 From the computer to the input register 2 information and control words are stored. Interpretation of exchange control words indicating operation mode. you device is produced in block

0 1 control After the arrival of information words from a computer with the absolute coordinates of Hod and the FEC. their code values are written to the corresponding adders 5 and b and according to the signal

5 from control block 1 is received via keys 7 and 8 to fifth fifth and sixth 14 digital channels: new converters. The current equivalent of the pinned code is fed to the inputs of the deviation amplifiers 15 and 16 and then to the deflection

0 system 17 CRT. The beam moves across the screen of the CRT 18 to the appropriate point. The current signals from the first 10 and second 13 digital-to-analog converters of the increments and the third 11 and fourth 12 digital-to-analog converters (compensating), arrive at the corresponding inputs of the amplifiers 15 and 16 deviations and are compensated. After reaching the desired point on the screen, the control unit generates a signal to illuminate the points and then to refine, which initially illuminates the points, and then another request is generated from the computer. At the same time, according to the signal from control unit 1, the contents of adders 5 and 6 are copied to data registers 25 and 26.

Q When entering into the input register 2 information words with increment codes D A IMU (for example in vector mode), the indicated codes are entered into the corresponding registers 3 and 4 increments and shifting registers

21 and 22, being fed to the digital inputs of the respective converters 1Q - 13. According to the signal from the control unit 1, the contents of the adders 5 and 6 are copied to the corresponding

0 registers 23 and 24 absolute coordinates. Currents generated on the outputs. converters 10 -13 are respectively equal. From control unit 1 to the analog input of the converter

5 10 and 13 increments receive analog sawtooth signals, causing corresponding uncompensated currents at the output of these converters, adding to the current supplied to the amplifiers 15 and 16 deviations from absolute digital-to-analog converters 9 and 14. The beam is deflected across the screen to a new point , moreover, the trajectory of its movement is highlighted (if there is a sign of highlighting in the corresponding information words). As the beam arrives at the new point, which is determined by the level of the incoming analog signal, the control unit generates signals that stop the beam illumination, writing the contents of the shift registers 21 and 2 to adders 5 and 6, and passing the new absolute coordinate found in adders Through the keys 7 and 8 to the inputs of the absolute digital-to-analog converters 9 and 14. Thus, despite the absence of an analog signal at the inputs of the converters 10 and 13, the beam is retained A new point is received by the current from the absolute converters 9 and 14. When editing the information received in the device by absolute coordinate codes (for example, point mode), the device operates similarly as described above with the difference that the signal received by the light fixture of the light fixing unit 20 is converted into a pulse signal arriving at the backlight unit to indicate to the operator the selected element (point) on the CRT screen and into control unit 1, where a signal is generated by which the computer determines the address of the RAM cell in which it is recorded and formations on the element to be edited on the computer corresponding signal can receive the coordinate information .o element from registers 25 and 26 data. When editing device operation vectors, it is slightly different from the one described above. If you specify a certain point of the vector with a light pen, then when the beam reaches this point, the light fixing unit 20 generates a signal that goes to the backlight unit 19 and for some time prohibits the illumination of the operator’s element and, thus, the operator sees the element (vector) selected by him . This impulse enters control unit 1, where control pulses are formed, according to which the contents of adders 5 and b are copied to the corresponding registers 23 and 24 of absolute coordinates, the relative coordinates are forbidden from the shift registers 21 and 22 to adders 5 and b, ends supplying an analogue sawtooth signal to the inputs of digital-to-analog converters of 10 and 13 increments. Since the contents of adders 5 and 6. have not changed, the beam returns to the starting point of the vector. At the same time, the information from the control unit shifts the information by 1 bit in the shift registers 21 and 22. The signal from the control unit again suppresses the analog signal to the increment converters 10 and 13 and the beam begins to deflect to a new point, since the shift registers contain the increment information is 2 times smaller than that stored in the increment registers .3 and 4, then the developed vector is two times shorter than the initially specified value. When reworking can. Two situations arise: a) when re-working from the light fixing unit 20, a signal passes to the control unit; b) this signal is not generated. In case a) the device operates similarly to that described above, i.e., the analog signal is reset, the content of adders 5 and b is forbidden, information is shifted in the shift registers 21 and 22 and the next analog signal is fed to the converters 10 and .13 increments. Thus, a vector j equal to 1/4 of the original / i.e. An analysis takes place to find the specified point of the element in its first quarter. In case b), i.e., if no signal is generated by the light-fixing unit during the testing of the half vector, which indicates that the point is in the second half of the element being worked, then when the analog signal reaches the level indicating the output to the new point, the control unit signals are written to write the contents of the shift registers 21 and 22 to the adders 5 and b and through the keys 7 and 8 to the inputs of the absolute digital-to-analog converters 9 and 14, the cadres of the absolute point M5s come. shift registers and the next analog signal addition to the input increment converter, i.e. ANALYSIS is made on finding the specified point of an element in its third quarter. Further, the device operates as described in situations a) and b) until the analysis unit determines that the accuracy of finding the coordinate is equal to a predetermined one. If the given accuracy of finding the point coordinates is one piacTpa unit, then this is an analysis of the absence of information in all bits of the shift registers 21 and 22, except the youngest. When the specified accuracy is reached, the comparison block 27 generates a signal, nocTynarouiisift to control block 1, which sends control signals for two successive operations: writing the contents of adders 5 and 6 to data registers 25 and 26 and writing the contents of registers 23 and 24 absolute coordinates to adders 5 and 6. At the same time, the information stored in registers 3 and 4 increments is recorded in the shift registers, an analog signal is generated to the inputs of the transducers 10 and 13 increments. After incrementing, the content of the shift registers 21 and 22 is written to adders 5 and 6 and a new absolute coordinate is fed to the inputs of absolute diffracted analogue converters 9 and 10. Thus, the beam is fixed at the screen point with coordinates + DX and Voigc.Hau.BKT + DU, i.e. received vector worked out. Another request is generated in the computer, according to which the device receives information about the next image element. The information, the qi of the coordinates of the point specified by the operator is in the registers 25 and 26 of the data and can be received in the computer,

Thus, when editing information, any point on the screen can be found after several cycles of analysis. The number of cycles depends on the size of the studied (edited) element. The maximum number of analysis cycles is equal to the information addressing bit, i.e., with the number of addressable points in the coordinates 1024. The maximum number of cycles is 10 with a given editing accuracy of one addressable point.

Thus, it is possible to use a marker for editing, consisting of the minimum number of elements, which increases the time for displaying basic information on a CRT; directly find the coordinates of the points on the screen through which the elements of the image pass, even those that do not belong to the elements of the marker; to reach the prescribed accuracy of finding the code of Inata; to reduce the editing time due to faster movement of the marker by the operator; the marker size can be done much more than before, since the analysis time is almost independent of the size of the marker elements.

Claims (2)

1. USSR author's certificate 485441, cl. G 06 F 3/00, 1972. 2. Devices and control systems 1975, No. 9, p. 35-36 (prototype.