SU746622A1 - Device for shaping image on television display screen - Google Patents

Description

(54) DEVICE FOR THE FORMATION OF IMAGES ON THE TV SCREEN INDICATOR SCREEN

The invention relates to a computing technique that can be used in display devices for information &n; CRT screen. Devices for forming images on a television screen are known, in which a dot matrix 1 is used when displaying graphical elements formed as separate segments of straight or curved lines. Known devices have a low nationality. It is also known a device for displaying information on a CRT screen, containing a clock pulse generator, a trigger connected to counters, a character sampler connected to a CRT, a pulse shaper in a row, a row shaper, AND elements, OR connected to the pulse shaper in the line connected to the first counter and trigger, the other to the line shaper connected to the second counter, the outputs of the AND elements are connected to the OR elements connected to the character select block 2, the Disadvantage of stnogo devices is that when a large number of characters in the alphabet requires a substantial increase in equipment that entails a reduction in device reliability. The aim of the invention is to increase the reliability of the device. The goal is achieved by the fact that a device containing a character generator, a pulse generator, the output of which is connected, to the input of the element counter, the first output of which is connected to the input of the familiarity counter, whose output is connected to the input of the row counter, the first output of which is connected to the input of the frame counter and The first input of the television indicator, the second input of which is connected to the output of the counting frame, has been introduced four decoders, two code converters, a selection block

the element code, the line code selection block and the coincidence block, whose code is connected to the third input of the television indicator, and the first input - to the output of reHepaTdpia characters, the first travel of which is connected to you: the first decoder, whose input is connected to the output of the first code converter, the first the input of which is connected to the second output of the element counter, and the second input to the output of the element code selector output, the input is cotily connected to the input information bus and to the input of the row iodine selection unit, the output of which is connected to the first input to A second code converter, the second input of which is PBD to the output of the row counter, and the output to the input of the second decoder, the output of which is connected to the second input of the character generator, the third input of which is connected to the output of the third decoder, the input of which is connected to the input data bus and to the input the fourth decoder, the output of which is connected to the second input of the block; coincidence.

FIG. 1 shows the block diagram of the device; in fig. 2 is an example of a specific display of segments on a CRT screen.

A device for generating images on the screen of a television indicator contains a generator of 1 pulses, a counter of 2 elements, a counter 3 familiarity, a counter of 4 lines, a counter of 5 frames, a block 6 of selection of a code of elements, a first converter of 7 codes, a first decoder 8, a generator of 9 characters, a block 10, the row code selection, the second converter 11, the second decoder 12, the third decoder 13, the fourth decoder 14, the matching block 15, the television indicator 16.

The device works as follows ... ,,,. ,. „

The pulses from the pulse generator 1 are fed to the input of the counter 2 elements which counts the number of elements of the familiarity along the television line, the counter 3 counts the number of familiarity in the line and thus determines the image shape horizontally, the counter 4 generates synchronization pulses .

From the output of the counter 4 pulses along ctynajoT to the input of the counter 5 {(adroj scan.

The coping unit selector 6 selects the part that determines the position of the alem1ntov of the given symbol in the familiarity, the signals from this block go to the second input converter 7 of the codes, the code of the elements arrives at the first input of the last from the counter of elements 2, the converted code signals through the decoder 8 is fed to the input of the generator 9 characters.

The part of the code selected by the block 10 for selecting the code of the lines from the code of the displayed symbol arriving at its input arrives at the first input of the converter of 11 codes, and the second input of which receives the code from the counter of 4 lines. The converted code is fed to the input of a 12 line decoder, the characters from which are fed to the second input of the generator 9 characters.

The code of the displayed symbol is divided into the code of the lower bits entered at the input of the decoder 13, and the code of the higher bits entered at the input of the decoder 14. The output of the decoder 13 is connected to the input of the character generator, from the output of which the signals of the illumination functions of individual elements of the alphabet are taken, the number of functions is equal to the number of outputs of the decoder 14. Block 15, a match is made to select the elements corresponding to the displayed symbol; the output of this block is connected to the input of the television indicator 16. The scanning of the television indicator is synchronized with the line and frame sync pulses coming from the row counter and the frame counter.

FIG. Figure 2 (item 1) shows the codes received from the outputs of the decoders 8 and 12 to the inputs of the 9-character generator, in which the backlight function is formed, and as a result, the segment shown in Fig. 2 is displayed on the screen of the television raster. 2 position 1 on the right.

In order to obtain a segment in accordance with its code (Fig. 2, position P), part of icoTOporo is fed to the input of the row code selection unit 10, in the 11 code converter, the row code from the row counter is changed to inverse. For segmentation of a segment (Fig. 2, position III), in accordance with the code received at the input of the unit code selection unit 6, in the code converter 7, the unit code coming from the unit counter, mei c to inverse. To obtain a segment (Fig. 2, the position of the ft). The row codes of the n elements are changed to 57 inverse at the same time, coming from the row counters and elements to the inputs of the converters 11 and 7 of the codes, respectively. At the same time, in the generator 14 characters to obtain on the television raster four in this example (positions 1-1U of FIG. 2) segments only elements are used to form one segment of position 1, which significantly reduces the hardware costs for the formation of characters. Decoders 8 and 11 put the code arriving at their inputs in time dependence on the clock frequency of the pulse generator. In the proposed device, the code of the younger times | mdov of the displayed sign (graphic element) goes through the decoder 13, which has r outputs, to the input of the generator 14 characters, where each of the n codes of the lower bits is used to generate K elements used to display the entire alphabet of characters; senior bits of the code come in, IJ.V- t.t.j ni iiJii ll. 11. luch l J d. t.j.j decoder 14, which has K outputs

to the input of block 15 coincidence.

At the output of the coincidence unit, a total illumination function for H-n-characters is generated.

In this case, the first inputs of the coincidence circuit receive the elementary illumination functions for K character groups. To uniquely identify the function for each of the 4 characters, the match block has IK inputs. This allows a significant reduction in hardware costs when choosing the alphabet of characters, as in the construction of a conventional decoder ,. the character generator included at the input, the number of matches of the block matches 2 TV K, i.e., A times as much.

The proposed device is beneficial, since it significantly reduces the hardware costs for the formation. images and, as a result, it also has superior reliability.

Claims (2)

1. Television methods and information display devices ed. MI Krivrsheev, M., Sov. radio, 1975. 2. USSR author's certificate 50 № 56OU48, cl. G 06 K 15/20, 01.O7.75 (prototype). 22 torus containing a character generator, a pulse generator, the output of which is connected to the input of the element counter, the first output of which is connected to the input of the familiarity counter, the output of which is connected to the input of the row counter, the first output of which is connected to the input of the 4Hka frame and to the first input a television indicator, the second input of which is connected to the output of a frame counter, characterized in that, in order to increase the reliability of the device, four decoders, two code converters, a block for selecting the element code, a block for selecting and block coincidence line and whose output is connected to a third input of the television display, and a first input - with the output of the generator of characters, the first input coupled to an output of the first decoder. the input of which is connected to the output of the first code converter, the first input of which is connected to the second output of the element counter, and the second input - to the output of the block for selecting the code of the elements: whose input is connected to the input.infor; - hp - -, - n ---- T the output bus and to the input of the selection block