US3696387A - Circuit arrangement for controlling cathode-ray tubes for the display of alpha-numerical characters - Google Patents

Circuit arrangement for controlling cathode-ray tubes for the display of alpha-numerical characters Download PDF

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Publication number
US3696387A
US3696387A US45180A US3696387DA US3696387A US 3696387 A US3696387 A US 3696387A US 45180 A US45180 A US 45180A US 3696387D A US3696387D A US 3696387DA US 3696387 A US3696387 A US 3696387A
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matrix
characters
display
character
line
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US45180A
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English (en)
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Hans-Georg Nussbaum
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Priority claimed from DE19691932113 external-priority patent/DE1932113C3/de
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/24—Generation of individual character patterns

Definitions

  • SHEET 1 BF 2 T1 T2 T3 COLUMN COUNTER LINE COUNTER h h m BRIGHTNESS E MODULATION D SIGNAL T FLlP-FLOP INVENTOR. HANS GEORG NUSSBAUM 1/ 'wgfi 't PATENTEDUCT 3 I972 SHEET 2 IF 2.
  • the invention relates to a circuit arrangement for controlling the electron beam intensity in the display of characters composed of matrix type elements on the screen of a cathode-ray tube with the aid of a line counter and a column counter, in which a dot matrix produces for each dot of the character field at a respective output a signal from the output signals of the line counter and the column counter.
  • a direct information exchange in the form of a dialogue is particularly desirable without long delay times between question and answer.
  • the phosphor screen of a cathode-ray tube may be employed for the display of alphanumeric character.
  • display screen apparatus have to include a character store in which the character to be displayed are stored in their known form.
  • the present invention avoids said disadvantages and is characterized in that a group matrix combines these outputs in accordance with the form of character elements preferably common to at least two of the characters to be displayed and in that a character matrix produced the complete signal of a character at a respective output of the character matrix from the resultant character elements and from the signals of the outputs of the dot matrix and, as the case be, from the direct output signals of the line counter and the column counter and in that in accordance with the character to be displayed the corresponding output of the character matrix can be selected.
  • the circuit arrangement according to the invention is suitable for all methods in which the characters to be displayed are formed from a matrix of dots.
  • the size of the dot matrix as well as the sequence of scanning of the matrix columns and matrix lines is arbitrary.
  • the character may therefore be scanned and built up column by column or line by line.
  • the store is scanned so that its output signal represents the frame signal of a television signal. If this frame signal is combined with a standard synchronizing and deflection signals, a complete television signal is obtained, which can be converted by any standard monitor into a legible text. In this method special deflection circuits may be omitted.
  • the store output signal may also be mixed with any frame signal of a corresponding standard.
  • alphanumeric characters or symbols may be introduced under computer control. This may be important in the synchronization of foreign language films or in the recording of weather graphs. It is furthermore possible to control projection television systems (for example eidophores) by this signal.
  • projection television systems for example eidophores
  • FIG. 1 illustrates the decomposition of the letter D I into elements
  • FIG. 2 is a block diagram of the circuit arrangement
  • FIG. 3 shows in detail the dot matrix array of FIG. 2
  • FIG. 4 shows further details of the character generator of FIG. 2 (example of the production of the signs I, O and H);
  • FIG. 5 shows the pulse shaper IF.
  • FIG. 1 shows the sign D" of the form obtained by an array of dots of the size of 5 columns X 7 lines 35 dots.
  • the beam deflection may be that of television methods.
  • the intensity of the electron beam has to be controlled so that only the dots to be displayed are scanned in order of succession.
  • the pulse width of a sign may be I ,usec, the space interval between two signs may be 0.2 p.sec so that on one line about 43 signs are represented since the duration of one line in the CCIR-625-Iine standard amounts to 64 usec, about 18 percent of which is taken by the line fly-back blanking. Since in interlaced scanning the frame frequency is 50 Hz and since the two frames can be formed identically, the pulse sequence has to be repeated every 20 msec for intensity control.
  • FIG. 1 illustrates this method for the D. It will be apparent that the D comprises three character parts T T T which are also found in other characters.
  • the sign part T is, for example, also found in the letters B, E, F,-I-I etc.; the sign part T is found in the letters B, C, G etc.; and the sign. part T is found in the letters 0, 0, etc.
  • FIG. 2 shows the block diagram of a circuit arrangement.
  • the essential parts here are the dot matrix PRM, the group matrix GM, the character matrix ZM and the character selection stage ZS.
  • the arrangement operatesas follows:
  • The. dot matrix PRM controlled by the column counter 82 and the line counter ZZ produces in order of succession all dots of the dot matrix required for composing the various characters, the order being determined by the timing pulses Ts and T2, the number of dots in the matrix corresponding with the number of output conductors of the dot matrix PRM, which is at the most equal to the product of line and column numbers. They control the group and character matrices so that in the group matrix GM the matrix dots are combined into dot groups and in the character matrix ZM dots and dotgroups are combined to characters so that at the same time all characters stored are produced.
  • the character selection stage ZS only the character stored by the character writing member ZE in a given coded form in the register R and decoded by the decoder D is selected and applied as an intensity modulation signal via an or-gate O, a pulse shaper IF and an inverter I and displayed on the screen, the space control ZWST controlling blanking between thev signs and the lines.
  • the timing pulse Ts has a period: of 0.2 psec and determines the width of a column of the dot matrix, whereas that of the timing pulse Tz is 64 usec, determining the television line frequency of 15.625 kHz in the CCIR-625line standard.
  • the formation of the total television picture starts after the fly-back of the beam and after the termination of blanking at the upper left hand corner.
  • the line counter 22 is adjusted to the first matrix line, the column counter SZ to the first matrix column.
  • the timing pulse Ts steps on the column counter SZ and the dot matrix PRM produces in order of succession all points of the first matrix line.
  • the television line synchronizing pulse steps on the line counter ZZ so that at the termination of the first television line the nextfollowing line is produced dot-sequentially.
  • the dot matrix is shown in detail in FIG. 3. It is formed by a group of m X n and-gates in m columns (in this case 5) and n lines (in this case 7).
  • the line counter output Z 1 has the 1 -signal and the timing pulses Ts appear sequentially at S 1, S 2 etc. up to Sm (in this case S 5). Consequently, in order of succession the outputs of the and-gates U 11, U 12 to U 1m (in this case U 15) have a 1 -signal.
  • the dots are assembled to dot groups so that character portions are produced, which are common to two or more characters.
  • the characters written in, coded form are intermediately stored in the store R in a fixed order of succession in which they have to appear on the display screen and passed through the decoder D.
  • the character selection stage ZS is controlled.
  • all characters are thus simultaneously produced for each place on the display screen; in the selection stage ZS, however, only that character is selected which has to be displayed in accordance with the information stored in the store R.
  • the output conductors of the character selection stage are combined by an or-gate.
  • the frame signal passes through a pulse shaping stage IF, one embodiment of which is shown in detail in FIG. 5. It comprises two parts which may be included either separately or in common.
  • the D-flip-flop of the first stage serves for compensating the transit time differences between the pulse sequences of the dot matrix PRM or the column counter SZ respectively and the pulse sequences of the group matrix GM occurring in the subassemblies due to time lags.
  • the transit time difference At is due to the fact that the circuit producing the horizontal dash comprises more switching stages and therefore exhibits a longer pulse delay time than that producing the vertical dash.
  • the signal for the first dot has already terminated before the signal for the next dots of the horizontal row starts and the composite signal exhibits a short 0-signal between the l-signals of the first and second columns. This interval has a disturbing effect on the display screen.
  • the frame signal is applied to the D-input of a D-flipflop which is controlled by the timing pulse Ts of the column counter so that the transit time difference is compensated for.
  • the second part (IB) of the pulse shaping stage IF produces a widening of the pulses. This may be necessary if it is desired to display a large number of characters on each line.
  • the fundamental frequency of a 0 l 0 l O- pulse sequence attains the magnitude of the upper limit frequency of the conventional television monitors.
  • the pulse widening stage comprising the inverters A, B and C in FIG. 8 produces from the given television signal a signal having widened l pulses by utilizing the signal delay time of the real digital circuits. It is supposed here that all members have the same pulse delay time At. This provides a pulse widening by 2 At- Between points A and Q (FIG. 5) any odd number, of inverters may be included in order to obtain larger pulse widening.
  • the inverter I inverts the output signal.
  • the text may optionally be displayed bright on a dark background or conversely; for example, a given text written manually white on black and a text supplied by a computer may be written black on white in depence upon the control signal St.
  • the brightness modulation signal (B- Signal) can be derived, which subsequent to mixing with'an identifying signal and a synchronizing signal represents the complete television signal in the CCIR- standard. This signal may control a standard television monitor.
  • a circuit arrangement for modulating a television type display with character information in the form of a dot matrix comprising a column counter connected to receive a continuous series of pulses corresponding to the dots of the matrix on the display and providing sequential column signals on a plurality of output conductors corresponding to the number of columns in the display matrix, a line counter connected to receive a continuous series of pulses corresponding to the lines of the matrix on the display and providing sequential line signals on a plurality of output conductors corresponding to the number of lines in the matrix on the display, a dot matrix generator connected to the output conductors of the line counter and the column counter for providing a plurality of sequential pulses on separate lines each line corresponding to a dot on the matrix to be displayed, a group matrix connected to the dot matrix generator for providing on a plurality of output conductors signals corresponding to character elements common to at least two of the characters to be displayed, a character matrix connected to the output conductors of the column counter, the line counter, and the group matrix for providing on output conductors of

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
US45180A 1969-06-25 1970-06-10 Circuit arrangement for controlling cathode-ray tubes for the display of alpha-numerical characters Expired - Lifetime US3696387A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691932113 DE1932113C3 (de) 1969-06-25 Schaltungsanordnung zur Steuerung der Intensität des Elektronenstrahles von Kathodenstrahlröhren für Zeichendarstellung

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JP (1) JPS5023936B1 (enrdf_load_html_response)
FR (1) FR2051256A5 (enrdf_load_html_response)
GB (1) GB1319533A (enrdf_load_html_response)
SE (1) SE350347B (enrdf_load_html_response)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810166A (en) * 1972-05-05 1974-05-07 Aston Electronic Dev Ltd Electronic character generating systems
US4000486A (en) * 1973-10-23 1976-12-28 International Business Machines Corporation Full page, raster scan, proportional space character generator
US4005390A (en) * 1974-11-11 1977-01-25 International Business Machines Corporation Merger and multiple translate tables in a buffered printer
USD243363S (en) * 1974-10-09 1977-02-08 Honeywell Inc. Font of characters for forming a graphic display
US4031519A (en) * 1974-11-11 1977-06-21 Ibm Corporation Printer
US4199757A (en) * 1977-01-21 1980-04-22 Tokyo Shibaura Electric Co., Ltd. Character display apparatus
US4204208A (en) * 1977-08-30 1980-05-20 Harris Corporation Display of video images
US4484231A (en) * 1980-09-30 1984-11-20 Sony Corporation Printing apparatus
US4600920A (en) * 1982-06-15 1986-07-15 Canon Kabushiki Kaisha Display device for producing overlapped display of character patterns
US4731608A (en) * 1984-07-27 1988-03-15 Siemens Aktiengesellschaft Image control unit for a video display unit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5559284A (en) * 1978-10-26 1980-05-02 Fuji Sash Kogyo Kk Attaching*detaching device and door
CA1188724A (en) * 1981-06-14 1985-06-11 Victor Company Of Japan, Limited Device for correcting an image on a picture tube having in-line electron guns and a coil assembly for the device
JPS60199174A (ja) * 1984-03-24 1985-10-08 松下電工株式会社 ドアの閉塞保持装置
JPS60199175A (ja) * 1984-03-24 1985-10-08 松下電工株式会社 ドアの閉塞保持装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3109166A (en) * 1959-10-26 1963-10-29 Columbia Broadcasting Syst Inc Character generator apparatus
US3426344A (en) * 1966-03-23 1969-02-04 Rca Corp Character generator for simultaneous display of separate character patterns on a plurality of display devices
US3432845A (en) * 1966-03-08 1969-03-11 Ibm Numeric display
US3444319A (en) * 1966-07-26 1969-05-13 Rca Corp Character generator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3109166A (en) * 1959-10-26 1963-10-29 Columbia Broadcasting Syst Inc Character generator apparatus
US3432845A (en) * 1966-03-08 1969-03-11 Ibm Numeric display
US3426344A (en) * 1966-03-23 1969-02-04 Rca Corp Character generator for simultaneous display of separate character patterns on a plurality of display devices
US3444319A (en) * 1966-07-26 1969-05-13 Rca Corp Character generator

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810166A (en) * 1972-05-05 1974-05-07 Aston Electronic Dev Ltd Electronic character generating systems
US4000486A (en) * 1973-10-23 1976-12-28 International Business Machines Corporation Full page, raster scan, proportional space character generator
USD243363S (en) * 1974-10-09 1977-02-08 Honeywell Inc. Font of characters for forming a graphic display
US4005390A (en) * 1974-11-11 1977-01-25 International Business Machines Corporation Merger and multiple translate tables in a buffered printer
US4031519A (en) * 1974-11-11 1977-06-21 Ibm Corporation Printer
US4199757A (en) * 1977-01-21 1980-04-22 Tokyo Shibaura Electric Co., Ltd. Character display apparatus
US4204208A (en) * 1977-08-30 1980-05-20 Harris Corporation Display of video images
US4484231A (en) * 1980-09-30 1984-11-20 Sony Corporation Printing apparatus
US4600920A (en) * 1982-06-15 1986-07-15 Canon Kabushiki Kaisha Display device for producing overlapped display of character patterns
US4731608A (en) * 1984-07-27 1988-03-15 Siemens Aktiengesellschaft Image control unit for a video display unit

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GB1319533A (en) 1973-06-06
DE1932113A1 (de) 1971-01-07
FR2051256A5 (enrdf_load_html_response) 1971-04-02
SE350347B (enrdf_load_html_response) 1972-10-23
JPS5023936B1 (enrdf_load_html_response) 1975-08-12
DE1932113B2 (de) 1976-10-07

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