SU807370A1 - Device for displaying information on crt screen - Google Patents

Description

one

The invention relates to automation and computing, can be used in the construction of alphanumeric indicators on cathode-ray tubes.

A device for displaying information on a screen of a cathode-ray tube (CRT) is known, comprising a control unit, a deflector voltage former, a pulse distributor, and an illumination unit ij.

However, the device forms and. displays only numbers and a number of vectors oriented in the direction, i.e. has limited functionality. .

The closest in technical essence to the present invention is a device for displaying information on a CRT screen, containing a control unit, the output of which is connected to the input of the pulse distributor, the first output of which is connected to the first input of the deflection voltage generator, the counter of the symbol number in the text, the output which is connected to the first input of the memory unit, the second input of which is connected to the output of the text decoder, and the illumination unit {2

A disadvantage of the known device is the large amount of memory necessary for storing information about the displayed text.

The purpose of the invention is to simplify the device. The goal is achieved by the fact that the device contains a micropigram counter, the input of which is connected to the output of the pulse distributor, and the first output is connected to the counter input of the character number in the text, a micropigram decoder, the first input of which is connected to the second output of the micropigram counter, the second input is with the output the memory unit, and the output is connected to the second input of the deflecting voltage generator, and the decoder of the illumination code, the krtorogr input is connected to the output of the memory unit, and the output to the first input of the illumination unit, the second input to -expensively connected to the output of the control unit.

The drawing shows a functional diagram of the proposed device.

The device contains a control unit 1, a pulse distributor 2, a micropig counter 3, a character number in the text counter 4, a text decoder 5, a memory block 6, a micropigram decoder 7, a deflection voltage former 8, a code decoder 9 of the backlight, a backlight unit 10 . In the device is alphanumeric. The information is displayed by highlighting the necessary elements of some individual figure for each character. These figures are synthesized from a constant number of closed figures of micropoliter1 1m in a certain sequence, in which the number of elements is also constant. It is with the number of elements of the micro-polygame that, with odnoshnogo 1nogo, the number of outputs of the distributor 2 pulses, controlled by pulses from the output of the generator of pulses of the control unit 1. The pulse distributor 2 operates in such a way that only one of its outputs can be successively in the excited state at each clock cycle. Micropigram decoder 7 is used to translate a character code into a micropigram code. The number of outputs of the decoder 7 is determined by the number of possible micropigrams constituting the required set. An "1" between the output of the decoder and a micro-polygram determined from the set establishes a one-to-one correspondence. Therefore, only the outputs of the decoder 7 are in the excited state, which are necessary for the formation of the contours of the mapped symbol in order to ensure the formation of micropigrams in order to increase their numbers, one input of the decoder of the polypigrams is connected to the output of the 3 Micropigram counter. The formation of the diverting functions for such a micro polygram is realized in the shaper voltage generator 8, which consists of a switch and two integrators (not shown). In accordance with the excitation on this cycle of operation of the distributor 2 pulses by the output of the decoder 7 micro-polygrams, the switch of the diverter voltage generator 8 commutes the outputs of the distributor 2 pulses to the corresponding inputs of the integrators, from whose outputs the negative voltages X (t) and Y (t) are received on the corresponding deflecting systems of a CRT. Since only the necessary micropigrams are formed from the whole set of them and. the most favorable from the point of view of the structure of the displayed alphabet is only definite combinations of micropolygrams, it is possible to determine the number of such possible figures (R) .. Moreover, from each of these figures, G characters can be displayed by highlighting certain elements of micropigrams. Therefore, to store information about a single character (character code) in memory block 6, 1 EogiR + Cog2 (Ue-eA; where EQ. Q is rounded to the nearest magnification is required. The capacity of memory block 6 is equal to BTS%, MEO 2 (tahg) is two eA, where 5 is the number of displayed texts} M is the length (number of characters) in text 1. Since each character is synthesized from a figure composed of a constant number of CJ micropigrams each of which is turn consists of front | elements, then the maximum memory capacity of the backlight unit 10, K. с,. units, where 00 is the number of characters in the displayed However, it turns out that the illumination code is the same for a number of characters, since they are synthesized from different micropigrams. Therefore, the memory capacity of the backlight unit 10 is somewhat smaller. This is taken into account by factor B. Thus, the memory size for storing the displayed texts in the proposed device equals.,., RWeog2lmaxr) Ae.eA. in a known memory, the memory size is also determined by the storage capacity of the character storage and the storage capacity of the storage sequence of the characters,, n, and W-O. .p S max where 1 (the maximum number of paired elements to form a j-TO symbol. Since o.eog, HWeog2R + eo., {mQx.), the proposed device provides a reduction in the number of lengths of displayed texts in the proposed device. memory by the value of L Ws-MiZe a, -62 .p, Av.eA.The device operates as follows: Text decoder 5 receives one number of text to be replayed.At the same time, a trigger pulse is sent to the control unit 1, which is started by the pulse generator (not shown), from the output of which the pulses arrive at the input of ac pulse limiter 2. According to the text omer code, text decoder 5 forms the signal by which one of the entire set of stored texts is selected in memory block 6. By the start pulse and the state of the counter 4 character numbers in the text in the selected text the first character code is selected Discharges from the counter from the counter output of 3 micropigrams on each operation cycle of the distributor 2 pulses are removed only from a certain, appropriate for display th symbol mikropoligramme, output decoder 7 mikropoligramm. Under the effect of 1 of this circuit in the driver of 8 deflecting voltages, the outputs of the distributor 2 of the pulses are switched to the inputs of integral raters in such a way that the deflecting functions X (t) and 3 (t) are removed from the corresponding outputs of the shaper of 8 deflectors. A symbol is formed on the cycles of the distributor 2 pulses, the last output of which is associated with the input of the counter 3 T and the polygram 3, from which the overflow signal, which is the signal end of the symbol, takes the CRT beam to the next place. In addition, by the same signal, the counter 4 numbers of the symbol in the text is increased by.

Simultaneously with the formation of micropigrams from the output of block 6 of memory, the character code enters the input of the decoder 9 of the illumination code, which from the memory of the illumination block selects the elemental code of the illumination. This code under the action of pulses from the output of control unit 1 simultaneously with the formation of elements of micropigrams is successively supplied to the CRT modulator Z (t).

According to the state of the counter 4, the number of the symbol in the text, the code of the next symbol in the text is selected from the block of memory. The next character is displayed as described.

This process is repeated until the last character in the displayed text is formed and, from block 6 of the memory, the signal about the end of the output of the generated text is selected through the illumination code decoder. On this signal, the control unit 1 stops the formation of the signals that excite the distributor 2 pulses

Thus, the device is simplified by reducing the amount of memory. If you use a set of eight five-element tra :: vidial micropigrams, then eight different figures (R), no two {h micro complete programs each, turn out to be quite enough to display an alphabet of 52 characters (Russian, Latin) acceptable from the point of view of engineering psychology. digital). Since 1–20–25, the memory size will be reduced. L / 5 will amount to 2600–2500 two units (, 8). At the same time, the hardware costs are not significant, and the time required for the formation of symbols is as close as possible to the functional methods of imaging.

Claims (2)

1. USSR author's certificate 0 No. 302713, cl. q 06 to 15/20, 1971. 2. USSR author's certificate  463126, class G 06 K 15/20, 1975 (prototype) .. pPusk h End of text