DE2114665B2 - CIRCUIT ARRANGEMENT FOR A DISPLAY DEVICE WORKING IN VIDEO LINE MODE, CONTROLLED BY DIGITAL CODES - Google Patents

Description

Circuit arrangement according to the invention marked a light button signal generator, here in the form of a draws through a first light scanning circle with an OR gate 6, light scanning. To this end, the first detector, the detection signal of which is a light character generator 3 via scanning signal, not shown in each case with at least one count of the bin fertilize the respective status of a video line counting horizontal pixel counter brings about, and 5 lcrs 7 communicated, the video lines of the horizontal line counting the second Helitastkreis with a second Detek strip.

The generation of the bright point pattern in every video

Light button signal when at least one count of the deo line happens in the example shown in the

Video line counter brings about, in addition to a return way that the character generator 3 a corresponding

Stellkreis with a third detector, whose recognition io chendes bit pattern in which ζ. Β L = bright and

voltage signal dte resetting of the holding element 0 = dark means, via a gate 8 in parallel

leads. Shift register 9 enters, from which it then immediately

Provision is also made for the arrangement of rearward (to the left in the drawing) is pushed out

adjusting switching means for resetting the holding member by a shift clock TS, the impulses of which the image

by a video line end signal, whereby preferred 15 point times determine. When pushing out

the reset switches can be switched off. "which has the bit value 0 at the first shift clock pulse

It can be provided that a specific bit value I.

Count of the horizontal pixel counter both from the right end German » Shift register 9

the time of the setting and the resetting shifted from an appropriately trained additional

of the holding member as well as the 7 <utpunkt of the borrowed by 20, in the drawing (9). In this way

a detection signal from the first detector is produced after a window width corresponding to

led light button signal determined. the number of shift clock pulses in the shift

On the basis of the drawing, a register9 is not subsequently used when the image point is generated

Embodiment of the invention explained in more detail. Occurring bit pattern - in the example the pattern

In the 2'.eichnung 1 is a circulating memory , the 25 OLLLLLLL in the positions (1) to (8) - that through

z. B. a feedback delay path or a detector 10 is recognized with the effect.

May be drum track, and in which from a DA that the detection signal ST off the shift clock TS

Bit patterns fed in from the data source circle, switch on and register 9 clears. The order

successive, z. B. Include 1-digit codes. with the shift register 9 also has the function

The circular memory 1 can be one on the screen 30 of a horizontal pixel counter, with

line of characters »pixel« to be displayed on a display device all possible (light or dark-colored

be assigned, in which case further image points to be displayed are understood. In place of the-

the character lines such a circular memory this arrangement could also be a customary, in particular

are assigned which, one after the other, come to an external binary counter that determines the pixel times

Storage register 2 can be connected, counts down in the same way as we do 35 and also one after the other for output gate

and provides an image of the character generator 3 in its entirety. 1st to

Form repeating memory. To feel brightly to understand a pixel time, this is what happens

the invention, it is sufficient, essentially only one in the illustrated embodiment

Horizontal stripes of the screen catch your eye- pushing out an L-value on an input of the

sen, in which a character line should lie. 40 Odergatters 6, which causes a light key pulse

Characters should be output in this horizontal strip.

The character generator 3 required for the praying of video lines with the help of a character equipping a in the shift register 9 due to generator 3 to be built, in each case a recognized character code to be entered in a Fensu, the height of the z. B. 24 video lines 45 pixel bit pattern one processing time. This containing width of the horizontal strip and des is provided by the fact that after the entry., The width z. B. corresponds to 8 pixel times. In order to obtain the mutual spacing of the characters in the control register and the distance between the characters and the character clock pulse - character lines in the drawing, some are labeled at least with TZ (1) - the interrogation of the pixel in a window edge and the pixel times and Vi 50 bit patterns over the gate 8 cannot be occupied by the following, deo lines of the window of the character genes in the drawing with TZ (2) designated character rator3. clock pulse takes place (which at the same time fetches the next font target a character line filled with characters character code in the control register). The Erzeuwerden so are delayed the circulating memory 1 correspond gun _o a character cell dot pattern is thus accordingly the henfolge for forming characters in their tire 55 with respect to the supply of the Schriftzeichenkodes ordered, the individual characters determine the time of a Fensterbreiie,
mende codes are taken one after the other and (under It is now provided, in addition to keeping the characters in the circulating memory) entered in the Aus also line representations on the screen to storage register 2, from where they each testify in the form of horizontal and / or lower through a character clock TZ over a gate 4 in a 60 right straight line, so that z. B. underlining in front of the control register 5, to which recognition is taken, frames or form division circuits of the character generator 3 are attached, or other orthogonal figures are shown. In this way the code will be able to follow.

ge again for each video line of the horizontal strip. For this purpose, the data source in

offered, the character generator 3 the 65 the data flow of the circular memory 1 to suitable,

The effect is that in every video line, the positions for the

Structure of the inscribed, determined by the respective code, which does not determine any characters.

Characters, but are "graphic codes". As such are

provided here a code »VL« = vertical line, one of the main parts of the control register 5 no characters

Code BHL = beginning of a horizontal line and contains chenkode, or if such is in the

a code EHL = end of a horizontal line. Main part of the register 5 is present, in addition to the

These codes remain in the character generator characters, the pixel sub-pattern in a

gate 3 has no effect. 5 other area - e.g. B. Positions (1) to (5) - des

If a character clock pulse TZ (1) instead of shift register is entered video line by line and a character code the code VL is pushed out into the control and only part of the video register5 is entered, it will be occupied by a line of the window. In turn, the detector 11 can be recognized, the detection signal of which is routed to a vertical line over any number of the possible inputs of an AND gate 12. The io horizontal stiffener can be continued by the Ko-output of the undgatters 12 with a position - in the position (3) for the windows lying one below the other - of the shift register 9 received set bit "L", and it can be connected in each of these, in such a way that, if activated, a sign is placed next to the line in this position in the window or it is set to "L". This activation is done by the not, depending on the code, the 15 character line fed to the second input of the AND gate 12 except for the said bit "L" in the subsequent character clock pulse TZ (2), which is also entered in the control register. Of course, like every TZ pulse, the TS shift clock starts. When using the method of supply, i.e. a bright point via the OR gate 6 to which the set bits the activated output of the AND gate 15 generates pixel time "3" of the window, and there are several positions in the shift register 9 at the same time, because this process occurs for each video line of the window outside of the window set by the character generator 3, a position range that can be set through the entire window - with "L" values across the height, is repeated. Because in the middle, if the window is sufficiently wide.
The codes BHL and EHL are used to generate a vertical line by adding horizontal lines, and in order to generate the code VL, the 25 characters can be underlined over a desired vertical line Number of s, in a video line area of each window, the Honzontai strip to be continued. below the occupied by the character generator 3

A vertical line of double thickness can lie within the window area. Will be obtained in the control register by the fact that the output of the Undster5 by a character clock pulse TZ (I) of the gate 12 to two adjacent places - z. B. (3) 30 code BHL entered, so it is in a detector and (4) - the shift register 9 is connected, 16 recognized, and the recognition signal is obtained by connecting the set input of a clocked bistable toggle switch output of 12 is fed to position 17 further apart. With the following characters - e.g. (3) and (5). As can be readily seen from the clock pulse TZ (2), the flip-flop 17 is then borrowed, and provision can also be made for the display to be set. In the set state, it gives a signal, such as vertical thin, thick or double lines never set the input of another clocked bistable. can optionally be generated by multiple flip-flop circuits 18, which are then set by the next following key krtise such as 11, 12 with suitable connections to the character clock pulse TZ (3), so that the shift register 9 is placed in parallel and a delay of two window widths. In the state set to its own code in each circle, the flip-flop circuit 18 gives an action speech. four signal to an input of an AND gate

In the above-described case, a window width is never (n) made available for the vertical 19. Fin further input of the undgate 19. Using the video line counter 7 via a counter, however, it is also possible to display the vertical line (s) together with the level detector 20 only when the counter is active with one character in a window, the one in the aforementioned, below the position. For this purpose, it is provided that the area lying in the character area runs into the control register 5 and is assigned a code to be entered for the video line (there can also be more bit positions extended, those of the character area being counter readings that do not query the condition generator 3 mentioned, however in the in the meet). It is assumed that in the devices shown in dashed lines in the drawing 50 characters remaining free lower edge area is evaluated. From the additional bit position 13 z. B. video lines 16 to 23 are and that the detector line 14, the value of the detector 20 is queried on the counter readings "21" and "22" contained bits. A binary value, e.g. 0, speaks. Furthermore, it is assumed for the following, remains ineffective, while the other binary, that the now treated horizontal line light touch. B. L, the one input of an Andgate 15 acti- 55 circle together with a vertical line Helltastviert. Whose output is provided at one of the characters circle, which via the elements 11 unc chengenerator 3 unoccupied position - z. B. position 12 as in the drawing.
(7) - of the shift register 9 connected to this If the flip-flop 18 is set and the video position is set to "L" when activated. The active line 21 is started, two inputs of the and vation happens when the aforementioned input 60 gate 19 is activated. The shift register 9 can all of the AND gate 15 is activated by activating only one via the AND gate 12 in the position (3 also contain the second input by the character clock set L value, which a vertical line pulse TZ (2) The third input of the AND gate is thus connected via the OR gate 6 at the pixel time (7) 19 to a detector 21 which generates a bright point at the point of the drawing window, and 65 image purict time "3" (at which the L -Bit, if it arises because this is present in every video line of the window, is pushed out) you see recognition, again a vertical line extending over the window height of the bit pattern 000000LL in positions (1) to (8), either alone when the shift register 9 responds

gnal of the detector 21 then activates the output of the And gate 19, whereby a bistable flip-flop 22 is set. Their output signal in the set State activates the second input of the OR gate 6 and generates a light load signal via this, weldies remains as long as the flip-flop 22 is set. The resulting in cer video line 21 The light-scanned horizontal line begins, as can be seen from the above, 2 window width times plus 3 pixel times after entering the code BHL in the control register. Was a vertical line L bit in position (3) of the shift register during the (third) window width time 9, then the horizontal line attaches to this vertical line, running from this to the right. The code EHL is then entered in the control register for a subsequent window width line. This is recognized by a detector 23, whose recognition signal immediately an input of a And gate 24 activated, the second input of which is also activated by the counter setting signal "21" of the Video line counter 7 is activated. A detector 25 is connected to a third input of the AND gate 24, which in the example dealt with here, like detector 21, responds at pixel time "3" and whose detection signal activates the third input of the AND gate 24, so that this gate, if its other two inputs are also activated, it outputs a signal at its output, which The flip-flop 22 resets via an OR gate 26. The horizontal line that is lighted in video line 21 ends here, at a point in time through which the right end of this line is again to a vertical line, provided this is created in the window containing this point in time.

Assuming that the detector 20 is also on the video line counter reading "22" responds, the processes described are repeated in the 22nd video line, during which the codes BHL and EHL must be re-entered in the tax register in the same time sequence. The horizontal line is strengthened by it. It could also be represented as a double line by adding the For example, detector 20 responds to video line counters "20" and "22", or as a thin line, by responding only to a video line counter.

The flip-flop circuit 17 can be activated by the start of the output signal via reset lines (not shown) the set flip-flop 18 and the flip-flop 18 by the beginning of the output signal the set flip-flop 22 can be reset.

The delays provided in the light probe circles serve several purposes. The delay by one character clock interval after the detection of a code VL in the detector 11 or an additional bit L in the control register 13 takes into account the fact that the bit patterns composing a character appear from the character generator 3 with a delay of one character clock interval. The delay by two character clock intervals in the light button circle processing the code BHL serves the purpose of being able to precede the code BHL in order to underline a character sequence of the code sequence that generates it. The delay is necessary because the code of the first character in the sequence is then entered into the control register one character clock interval after the code BHL, and a character clock interval again passes before the character is written. The delay in the effect of the code EHL by only a few pixel times has the consequence that if the code EHL is appended to the aforementioned character code sequence, the underlining ends in the same window in which the last character in the sequence appears. The additional delay in the action of the code BHL by a few pixel times and also the delay in the action of the code EHL Un _{1 by a} few pixel times serve, as explained, to adapt the position of the start and end of a horizontal line to the position of a vertical line for the one position is provided inside the window. The number of pixel times by which the action of the code EHL is delayed and the action of the code BHL is additionally delayed can be selected differently for the two codes, and for this purpose the third inputs of the AND gates 19 and 24 are respectively in the drawing a detector 21 and 25 connected (while for the case described above, where the pixel time delays for BHL and EHL are the same, only one would have been sufficient). For example, if a vertical double line can be generated in a window, the pixel times for BHL and EHL can be selected so that a horizontal line begins on the right line of such a double line and ends on the left line of such a double line.

It should also be mentioned that the detection signals of the detectors 11, 14, 16, 23 decay with a small delay so that they are even more effective while a new code is already being fed into the control register by the subsequent character clock TZ.

After what has been said, it should be clear that, depending on the position of what can be filled with characters Area in the window, horizontal lines also above or above and below the characters and when using the additional bit method, vertical lines also left or left and right of the character could be generated in the window.

In the event that a code BHL but no code EHL appears for a horizontal mark, it is provided that the flip-flop 22 is reset by a video line end pulse (which is always required for the transition to the next video line) , or alternatively not. The video line end pulse ZE is fed to an input of an AND gate 27, the output of which is connected to the reset input of the flip-flop device 22 via the OR gate 26. L or 0 can be applied to the other input of the und gate 27. If y has been created, set if no code EHL has appeared. the video line end pulse ZE the flip-flop device back, that is, a bright horizontal line started in a video line ends at the end of this line. I <applied to the other input of the AND gate 0, the pulse ZE can not generate an output signal from the gate. The set flip-flop 22 Because it is set with the effect that the light line started in the video line in the corresponding video line of the subsequent horizontal stripe or other subsequent horizontal stripe! If necessary, starting again with the top horizontal stripe after back tensioning, we continue

309 511/4

until the EHL code is entered into the control register in one strip and the horizontal one Line ended in this strip. So you have it in your hand, by supplying only one BHL and EHL codes desired areas of the total image area to line or to underline several lines of characters with selectable beginning and end. As is easy to see, lines could also be created with light probe circles of the type described above.

10

that go through light-keyed characters, which is usually inexpedient will.

A light circle such as 11, 12 could also, as can also be easily seen, be inclined for the generation Lines are formed, for this it would be sufficient to connect the places of the output of the undgatters 12 to be shifted step by step via gates controlled by the video line counter 7.

1 sheet of drawings

Claims (9)

Count of the horizontal pixel counter (9) Claims: both the time of setting and resetting of the holding member (22) and the 1. Circuit arrangement for a time in the video time by a detection signal of the erlen mode working light button signal brought about by digital codes controlled detector (11) erable viewing device with one determined via a light. tast signal generator character image points in selected Visual character generator generating pixel raster times in each case of a character window, the window format by a horizontal io
Pixel counter and a video line counter
is determined, as well as with switching means for the addition of other built up from pixels The invention relates to a circuit Representations, characterized by order for a working in video line mode, at least one between a code receiving 15 controllable by digital codes display device with a register (S) and the light button signal transmitter (6) par- via a light button signal transmitter character image- allele ζι · η visual character generator (3) lying points in selected pixel raster times in each case Light scanning circle with a detector (11 or 14 or a character window generating character 16 or 23) for a no character determination generator, whereby the window fcr.nat by a menden code value, its detection signal in 20 horizontal pixel counters and a video time Connection with signals, which is determined by the horizontal counter, as well as with switching means for tal-Bildpunktabzähler (9) - "the / and the video generation of others also built up from pixels line counter (7) during representations of the character. generator of unoccupied pixel times generates known viewing devices with which a video display, causes a light button signal. 25 prepared characters as well as other 2. Circuit arrangement according to claim 1, there representations, in particular lines, possible characterized in that the light button circle is ver, use one for these other representations delay devices (12 or 15 or 17 to frame repetition memory in which the individual 19), through the effect of which the Helltast- image track kte the representations in one of their positions in signal appears delayed. 30 in a manner corresponding to the video grid. 3. A circuit arrangement according to claim 1 or brazen (see. S. Davis "Computer Dats Displays". 2, characterized by a detector by Prentice-Hall Inc., Englewood Cliffs, NJ. 1969, p. signal adjustable, resettable holding element (22) 329; U.S. Patent 3,396,377). This requires Spcizur Maintaining a Helltastsignal wäh- rather- and storage effort z. B. on the part of a die rend a sequence of horizontal pixel times. 35 electronic pixel coordinates providing 4. Circuit arrangement according to claim 3, seen computer. characterized by a detector (23) for an aim of the invention is an improvement in this regard- Code value whose detection signal is used as a signal for the fact that lines such as in particular a return of the holding member (22) effective their straight lines, which at the same time with writing will. 40 lines as dividing or underlining lines 5. Circuit arrangement according to claim 3 and / appear envelopes that can be generated. or 4, characterized in that the setting The circuit arrangement according to the invention for and / or reset time for the holding member is a display device of the type mentioned in the introduction by coincidence with a Sijnal des Horizon- characterized by at least one between tal-Bildpunktabähler (9) is additionally determined. 45 a code reception register and the light button signal 6. A circuit arrangement according to claim 1 or a transmitter lying parallel to the font generator the following, characterized by a the light duty circle with a detector for a none first light probe circle with a first detector character determining code, whose er- (11 or 14), the detection signal of which is a light detection signal in conjunction with signals sent by scanning signal in each case with at least one count 50 the horizontal pixel counter and / or the of the horizontal picture point counter (9) video line counter while from the character leads, and generates a second light probe with a generator unoccupied pixel times second detector (16), the detection signal of which brings about a light button signal. A hold key signal via a holding element (22) in particular, it is provided that the HeIl- contains at least one count of the video character 55 keypad delay devices Counter (7) brings about, in addition to a reset, the effect of which the light button appears delayed, circle with a third detector (23) whose he- In a further implementation of the invention is a identification signal the resetting of the holding element adjustable, resettable by a detector signal brings about. Holding element for maintaining a light load signal 7. Circuit arrangement according to claim 4 or 60 during a sequence of horizontal image point 6, characterized by reset switching means provided, and also a detector for a (27, 26) for resetting the holding element (22) code value whose detection signal is used as a signal for by an end-of-line video signal. a reset of the holding member becomes effective. 8. Circuit arrangement according to claim 7, it can further be provided that the characterized in that the reset switching 65 setting and / or reset time for the holding means can be switched off. by coincidence with a signal of the hori- 9. Circuit arrangement according to claim 5 and zontal image point counter is additionally determined. 6, characterized in that a particular In a preferred embodiment is the