SU572820A1 - Device for shaping characters on crt screen - Google Patents

Description

one

The invention relates to computing and is intended for use in display devices operating according to the method of the generated raster. It can be applied in television and in devices for displaying and documenting data that is displayed on a television screen.

A device for forming font characters with an inclination of the indicator screen, containing 1 character generator, video recorder is shifted, the output of which is connected through the video amplifier to the indicator input, a row counter, the output of which is connected to the input of the character generator, a shift clock counter, the input of which is connected to the output of the row counter and the output is connected to the second input of the Bideo register of the shift 1. However, in this known device the shift clock counter is used, which has a limited speed, which causes The device’s operation is consistent with an indicator operating in IB mode with respect to slow line scans. It is also known a device for the italicization of font characters on the screen; a visual indicator wound, containing a character generator, a video shift register, a video amplifier, a line scanning indicator, a row counter, a delay line with number of outputs corresponding to ch and iy lines in the sign, and the selector of delayed shear cycles. The input of the cereal generator is connected to the output of the row counter, the first input of the selector is connected to the output of the row counter, and the rest are connected to the outputs of the delay line, the output of the selector is connected to the second input of the video recorder of shift 2. This device has a large hardware volume and is not applicable in the mode of interlaced raster decomposition . The closest to the invention in its technical essence is a cereal generator containing a line code decoder, a backlight pulse generator connected to a backlight pulse selector connected to the decoder

character code 3. The last known device does not provide the direct formation of a video signal at the output, since it only forms the position code of character backlight pulses in a parallel code,

This requires the use of additional equipment (a shift register for converting the positional code of the illumination pulses from a parallel form to a serial one synchronously with the raster scan). In his

a queue, such a two-step conversion leads to a decrease in the speed of the device and, accordingly, the information volume of the data displayed on the screen of the indicator, because in the process of video conversion

Claims (3)

code of characters - a video sub-light of characters is entered in a supplementary operation (recording of the position code of the illumination pulses of the V. video shift offset for subsequent conversion of the parallel code into a serial code). The aim of the invention is to improve speed. In the described device, this is achieved by the fact that serially connected switchboard, delay unit and pulse distributor iodine connected to the impulse generator of iodine-light are entered into the device, and the line code decoder is connected to the switch and the backlight pulse selector. The introduction of a pulse signal distributor allows you to form combinations of 15 words of the illumination in a sequential code synchronously with the raster scan, which makes it possible to receive video signals of the illumination of characters directly from the output of the selector of the words of the illumination, while achieving a time gain of 20 rys due to simultaneous displacement of the reference operations to the generator of signs and pho; video signal signal illumination. This increases the frequency of circulation of the character generator. At the same time, the introduction of a commutator and a delay unit ensures the formation of the slope of the characters, due to the fact that for a given decomposition of the dotted matrix of characters, an increase in the shape of characters is achieved, which improves the readability of characters. FIG. 1 shows a block diagram of the described device; in fig. 2 - type of code combinations of words of the Y sign illumination. The described device contains a switch-35 commutator 1, a decoder 2 of the line code, a decoder of the 3-character code, a delay unit 4, a pulse distributor 5, a backlight pulse generator 6 and a selector of the backlight 7. Strobe signal arriving at 40 simultaneously to switch 1 simultaneously with the incoming line code to the decoder 2 line codes and the code of characters to the decoder code of the 3 code, ensures that the sign of the line to be decoded passes from the decoder 2 pa45 input of the delay block 4, where, depending on the number of the character string to be decoded provides for a time delay in the appearance of the output signal relative to the input signal. At the same time, the delay time with an increase in the number of the displayed character string is reduced by straining to zero when the last character string is displayed. The signal from the output of the delay unit 4 is fed to the input of the pulse distributor 5 and starts it. The pulse distributor, 55, which is a delay line, generates pulse-shifted signals at the outputs, then arrives at the input of the illumination pulse generator b, where the cumulative pulse signals are formed in the sequential form of the received set of sequentially distributed signals illumination, synthesized on the elements OR. The number of assemblies is determined by the required set of 65 plain words of the code combinations of the highlight words included in the alphabetic characters to be displayed. FIG. 2 that for the shape of the letter Y with the decomposition of 8X8 elements in the sign matrix, three types of illumination words are required. Similarly, from the graphic outline of other characters, all the necessary variations of the words illumination are determined. From the generator output of the illumination of the illumination, 6 words, which are combinations of the illumination pulses; ; The signals are transmitted to the pulse selector of the light 7. As a result of the sequential synthesis of individual video light, the video signal of the backlight of the signs is formed directly at the output of the pulse selector of the backlight. Compared with the well-known character generators that form direct font characters, the formation of oblique signs provides, when combined, display on one screen Enof-information from two sources, corresponding to forming direct and clap signs, visual selection of information from these sources. At the same time, the selection of information is sloped; the pom helps to improve the readability of characters, since, for a given minimum permissible format of decomposition of the matrix of characters, the slope makes it possible to increase the format of characters, while other methods of coding (highlighting) —change brightness, reversal of contrast, degrades the visual perception of sign information, since these methods of selection change the optimal display mode and the long-term effect of such information wears out vision erator. In addition, in comparison with the known, in the described device, the direct formation of the video signal at the output of the illumination pulse selector is achieved synchronously with the raster scan, which ensures the increase of the character generator performance by eliminating the intermediate shaping operation in parallel form. shorten the conversion time of the character code - the video signal of the character. At the same time, there is no need for a shift register to convert the parallel form of the positioning code and the highlight pulses into a sequential form synchronously with the raster scan. All this favorably distinguishes the new device from the well-known raster character generators. Claim device A device for generating marks on a screen of a cathode ray tube containing a line code decoder, a backlight pulse generator connected to a backlight pulse selector connected to a character code decoder, characterized in that, in order to improve the speed of the device, - external switch, delay unit and pulse distributor connected to the backlight pulse generator, and the decoder of the line code is connected to the switch and the Backlight pulse selector. Sources of information taken into account in the examination 1.Patent of France No. 2087887,, cl. G 06K 15/00, 1971. 2. The patent of Germany No. 2014954, cl. G 06K 15/20, 1973. 3. US patent number 3493938, cl. N OZN 7/30, 1973. L