SU723620A1 - Device for displaying information on crt screen - Google Patents

Description

one

The invention relates to automation and computer technology and can be used in the construction of devices for displaying graphic information on electron-beam tubes.

The sign indicator on a cathode ray tube is known, which is intended to reproduce alphanumeric characters in a matrix formed by 7x5 dots and contains a block of logic elements, a block of parts of alphanumeric characters, a unit for combining parts of symbols, a unit for selecting characters 1.

In this device, changing the number of decomposition elements of the matrix of characters, and / or changing the character set, their configuration leads to an increase in hardware costs in blocks of logic elements, parts of characters, combining parts of characters, selection.

A symbol generator is also known for simultaneously displaying characters on a set of display devices, comprising a symbol generator that simultaneously generates a complete alphabet of characters and symbols displayed on devices.

such as television receivers or monitors. The symbol generator generates a plurality of point signals for each scan line in a raster type scanning system. The selected point / signal group is combined to form a plurality of bitmap character images, which are constituent parts 0 of a plurality of character characters. These images are then combined together to obtain all the images of the characters of the alphabet. Dynamic images of Keni characters formed in this way are implemented on a variety of other display & joy devices on which these or other signs can be simultaneously represented. The device contains an input device, a channel selector (selector), channels, a buffer register, an AND element; character decoder, row counter, symbol selector valve displaying CRT, horizontal and vertical synchronizer, clock generator, synchronization pulse separator ,. character generator, video amplifier, line counter, counter of rows of characters / keys of even and odd lines, point counter, space between characters 2).

The closest is a device containing a register connected to a registration unit and connected in series to a synchronizer, connected to a regeneration unit, a counter along the X coordinate, a counter along the y coordinate, a control unit connected to a cathode-ray tube connected to the video amplifier 3. ..

But wealth is that, in devices, a change in the number of characters in a set leads to an increase in hardware costs in the character element generators and in the character decoder; changing the configuration of characters associated with the restructuring of the generator elements of characters; An increase in the number of decomposition elements of a matrix of symbols also causes a proportional increase in hardware costs in the generator of character elements, fe assemblies and blocks of AND-AND-AND elements

The purpose of the invention is to increase the reliability of the device.

The goal is achieved by the fact that a match block, a horizontal vector shaping unit, a vector duration shaping unit, a delay block and a series-connected adder connected to a register, a vector edge point shaping unit connected to counters in X and Y coordinates, a common shaping unit are entered into the device. points of vectors, connected to a coincidence unit, a unit for the formation of horizontal vectors, and units for forming vector durations, connected to a delay unit, an element excluding OR and block, the formation of vertical vectors, connected to the exclusive OR element and the OR element connected to the combination unit, the horizontal vector formation unit, the first delay unit, connected to the first Yostivevector length forming unit, with the second delay unit, connected to the second formation unit no vector durations.

The drawing shows a block diagram of the device for displaying information j

The device for displaying information contains a synchronizer 1, a counter on the X coordinate, 2, a counter on the v 3 coordinate, a control unit 4, an electron-beam tube 5, a regeneration block b, a register 7, an OR element 8, a video amplifier 9, an adder 10, a formation block 11 boundary points of vectors, block 12 form. nor the common boundary points of the vectors element exclusive OR 13,

| blocks the formation of durations. vectors 14, 15, a coincidence unit 16, a horizontal vector formation unit 17, a vertical vector generation unit 18, a first delay unit 19, a second delay unit 20, an input information bus 21.

The device works as follows.

From the output of synchronizer 1, serially connected counters in coordinates X 2 and Y 3, in the process of counting clock pulses, specify the address of each point (the point can be viewed as a single horizontal vector) along the image line and the line number in the image frame on the screen of the CRT tube 5.

Control unit 4 for lowercase and. frame sync pulses from the outputs of the counters along the coordinates X 2 and Y 3 cause the beam of the electron-beam tube 5 to deflect horizontally and vertically, thus forming on the surface of the electron-beam tube 5 a raster similar to the television one.

Regeneration unit 6 ,. synchronized by synchronizer 1 periodically, with a given frequency, regenerates the reproduced image, the character codes of which are received in block 6 via bus 21 of the input information.

From the output of block 6, the code of the currently playing character is fed to the input of register 7, where it is stored during the playback time of one-line symbol microspace in the character string; then register 7 enters the code of the next character.

The number of elements of the expansion of the line of the microsystem of characters and the gap between two adjacent characters in the line sets the counter on the coordinate X 2; the number of elements of the decomposition of the column of the microrastra of the symbol and the gap between two adjacent symbols in the frame sets the counter on the coordinate V 3,

The character code from register output 7 is fed to adder 10, where character codes having the same vector components or vector group are combined, due to which the adder. 10 has a smaller hardware structure than the symbol decoders that are commonly used for this purpose. KpOMQ, if in the character decoder the hardware costs grow in proportion to the length of the set of characters, then in the adder 10, the hardware growth is slower.

To justify the above, consider, for example, the alphabet, 5 consisting of four characters A, c.

C, D, which corresponds to the two-way single input code on register 7

On the four outputs of the decoder in a known device of symbols, the corresponding codes 00 for A, 01 for B, 10 for G and 11 for E are formed for the reproduced character. Then the corresponding potentials control the reproduction in a certain sequence of the component vector vectors of symbols ..

On the adder, 10 in the proposed device, the codes of symbols B, D and E are combined. They have a common element - a left vertical and upper horizontal line.

Such a combination reduces the composition of the equipment of the adder, since

01 V 10 V 11 00,

those. the inverted potential at the output of code 00 controls the reproduction of the full G symbol and. parts of symbols B, E (you can use any methods of abbreviation of Boolean expressions, gluing; absorption, Quine's method, etc.) known from the algebra of logic.

With the commonly used alphabet of 64 or 128 characters, the reduction in the instrumentation of the adder 10 is significant, since the larger the set of characters, the more common elements that can be combined.

In block 11 of forming the boundary points of the vectors, information is stored on the starting and ending point of the symbol vector, i.e. regardless of the length of the vector, the amount of information per vector is equal to two bits. Therefore, the volume of the apparatus of block 11 grows more slowly (by about 4.5 times) when the number of elements of the decomposition of the microraster changes, than for when the information about the vector contains information about each point of the vector.

The unit 12 of forming common boundary points of vectors combines boundary points, while the obga points of vectors of different types can be combined (for a point is a single vector, horizontal, vertical, inclined) and the points that are common for some vectors are initial, for others the only important so that the common points have the same coordinate.

Block .16 matches or lengths of isolated points of the symbol in the microraster field by coincidence in the process of reproducing the symbol of the values of the counters in x and y coordinates 2 and 3 for the given point.

The horizontal vector formation unit 17 may in the simplest case be a trigger with a counting input. At the beginning of the reproduction of a vector on a counting input

Such a trigger receives a signal from the output of the common formation block 12, the points of the vectors. The trigger is set to one and will remain in the unit until a second signal arrives on the same counting input, setting the trigger to zero. The time interval during which the trigger will stand in one will determine the length of the reproduced horizontal vector. In turn, the time between two counting units arriving at the input of block 17 from block 11 forming the boundary points of the vectors through block 12 is determined by the clock frequency of the surge potentials from the counter outputs by coordinates X 2 and Y 3, by coincidence of which sequential and sequential reading of information from block 11,

It should be noted that a point can be considered as a single horizontal vector and reproduced as a horizontal vector. For this case, the number of vector types will be reduced to four, but for

5 each point in block 11, instead of one bit of information, will have to be stored as for any vector two bits of information.

The vertical vector formation unit 18, the signal to the input of which enters through the exclusive OR element 13, is a delay T equal to the playback duration of one raster

5 lines. The second element of the vertical vector delayed by the time T will be reproduced exactly below the first, the third under the second, etc., forming a vertical vector,

The element exclusive OR13 in the simplest case is a bitwise comparison, i.e. a signal at the output of this block exists only when there is a signal at only one of its inputs. Thus, the first signal received at the vertical vector formation unit 18 from the output of element 13 will circulate through the feedback circuit, linking element 13 and block 18, and through these blocks until the input of element 13 from the output block 11 through block 12 will not receive a second signal. If there are simultaneously two signals on

The 3 inputs of the element 13 have no signal at its output, which is equivalent to the end of the reproduction of the vertical vector.

The reproduction of the right-side vectors by the first block of forming the duration of vectors 14, the first block of delay 19, left-angled by the second block of forming the durations of vectors 15 and the second block of delay 20, is analogous to the reproduction of vertical vectors, with the only difference that the block

19 realizes the delay of the image element by the time T + t, where t is the duration of playback of one image element, and the block

20- at time t - t.

Then each subsequent element is displaced relative to the element in the previous line to the right or left by the length of this element in the form of oblique angles at an angle of 45 to the left or vector of characters.

The signals from the outputs of blocks 16, 17, 18, 19, 20 are combined by the element OR 8 and through the video amplifier 9 illuminate certain sections of the raster lines on the screen of the electron-beam tube 5, forming the corresponding sections of characters along the entire raster line.

The proposed device can be used not only in raster devices for displaying information, but also in those where each symbol is displayed immediately, for example, in functional devices for displaying information. In this case, the time T must be equal to the playback time of a single line of the microraster of the character.

The use of new elements of an adder, a block of vector boundary points, a block that forms common boundary points of vectors, vectoring blocks forming durations of a vector, a block of matches, horizontal forming blocks, vertical vectors, and a delay block distinguishes the proposed device for displaying information from the known characters in the set of equipment in the adder grows more slowly than the character set; also less load on the elements of the adder and, accordingly, less dissipated power and heat in the adder; changing the configuration of symbols and / or the number of elements of the decomposition; the microsystem of symbols does not lead to a significant increase in hardware costs in the blocks of boundary points of the symbol vectors, the formation of common boundary points of the vectors, so depending on the length of the vector, the amount of information about this vector remains unchanged and equal to rvum bits and regardless of the character configuration. A symbol is formed from a maximum of five types of vectors (some types of vectors may be repeated, and some may not occur at all in each particular symbol configuration).

Claims (3)

1. Patent; Great Britain No. 1319533, I4T dated 06.25.69, 2. Patent ttoA No. 3426344, class 340-324, 04.02.69. 3. Television methods 0 information display devices, ed.MI Krivosheeva, M., Sov.radio, 1975, p. 74-77, fig. 4 (prototype).