US3631456A - Display device for displaying simultaneously a plurality of symbols arranged in juxtaposed relation in one line - Google Patents

Display device for displaying simultaneously a plurality of symbols arranged in juxtaposed relation in one line Download PDF

Info

Publication number
US3631456A
US3631456A US841795A US3631456DA US3631456A US 3631456 A US3631456 A US 3631456A US 841795 A US841795 A US 841795A US 3631456D A US3631456D A US 3631456DA US 3631456 A US3631456 A US 3631456A
Authority
US
United States
Prior art keywords
faceplate
display device
symbols
character
waveform
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US841795A
Other languages
English (en)
Inventor
Terumichi Yokoyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Application granted granted Critical
Publication of US3631456A publication Critical patent/US3631456A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
    • G09G1/08—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system
    • G09G1/12—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system the deflection signals being produced by essentially analogue means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material

Definitions

  • the present invention relates to a character-display device and more particularly to an improvement of a character disvplay cathode-ray tube which for example may be used for electrophotographic apparatus.
  • Another object of the present invention is to provide a character-display device of the type in which stroking"is effected only in the vertical direction while the horizontal stroke is a scanning line.
  • a further object of the present invention is to provide a character-display device having simple waveforms for vertical deflection.
  • a still further object of thepresent invention is toprovide a character-display device inexpensive tomanu'facture.
  • Thepresent'invention relates to a character-display device of a cathode-ray tube which may be used for example for printing by electrophotographydt is to be understood that'the term character" implies not only alpha-numeric symbols but also other symbols.
  • each of the horizontal scanning beams is deflected vertically in accordance with a few fundamental waveforms and the screen of a cathode-ray tube is excited to luminescence at a requiredportion orportions of the deflected waveform so that a plurality. of symbols arranged in juxtaposed relation in one line'may'be simultaneously displayed.
  • a plurality of horizontal scanning beams is required for each line of the display, and the beams are sequentially generated.
  • Said fundamental waveforms include a sinusoidal waveform, another sinusoidal waveform 'whose frequency is a multipleof the frequency of said firstmentioned sinusoidal waveform, a triangularly shaped waveform and another triangular waveform having a frequency which is a multiple of the frequency of said first mentioned triangular waveform.
  • plurality of symbols arranged in juxtaposed relation in one line may be displayed by four horizontal scanning lines which are deflected vertically to a-predetermined extent by the above described fundamental waveforms.
  • the brightness grid of the cathode-ray tube is controlled atarequired portion or portions of the deflected-waveform so that the screen of the cathode-ray tube is excited to luminescence.
  • the luminescence portions of .the screenare combinedin four scannings so that the symbols are displayed and then printed if required.
  • FIG. 1 is an illustration of the fundamental wavefonns used in the present invention
  • FIG. 2 illustrates symbols to be displayed by the synthesis of various portions ofsaid fundamental waveforms
  • FIG. 3 illustrates the symbol synthesis process
  • FIG. 4 is a block diagram of one embodiment of the device of the present invention.
  • FIG. 1 illustrating the fundamental waveforms for effecting the vertical deflection of the horizontal scanning electron beam
  • a designates a sinusoidal-wave
  • b a sinusoidal wave having a'frequency three times as high as that wave a
  • c atriangular wave
  • d a triangular wave c.
  • All of the above waves are in synchronism with the clock pulses (for example, 30kc.) designated by e in FIG. 1.
  • Each clock pulse is generated so as to divide the width of one alpha-numeric symbol into a unit width, the width of one symbol in the embodiment shown in FIG. 1 being dividedinto six unit widths.
  • the spacing between :the pulses is the'minimum unit of bright line (which should beztaken in this specification to mean that during this minimum bright'line unit ,the phosphor screen of the cathode-raytube is excited to'luminescence by electron bom- 'bardment).
  • FIG. 2 illustrates alpha-numeric symbols constructed or synthesized by use of the fundamental waves shown in FIG. I, the symbols including the Japanese characters, numerals, alphabets and special symbols. .Each symbol may be constructed by four strokes atxthemost according to the present invention. That is, -the-symbols maybe displayed in side-byside relation by-four-horizontal scanning lines that is by four horizontal scanning operations.
  • FIG. 3 is for explanation'how the three symbols Japanese .character 7, 3 and A aresynthesized orconstructed according to thepresent invention, and also illustrates the waves and bright lines selected for constructingthe abovethree symbols.
  • the selected waves are indicated by the dotted lines while the bright line (to excite the screen of CRT to luminescence),-bythe solid lines. Therefore, it'willbe seen that the solid lines are strokes-for constructing a symbol.
  • SCI, 8C2, 'SCSand SC4 designatethe timing for horizontal scanning and as described hereinabove, each symbol may, be constructed by four horizontal scannings at the most.
  • Sin T the wavea in FIG-l
  • Sin3T the wave -b in FIG. I
  • Tri T the-wave c in FIG. I;
  • FIG.- 4- illustrate. a block diagram of the. present invention.
  • numeral 1 designates a buffer. register having a suitable number of. stages forexample stages'each having :seven bits (the total of 128 symbols being represented) and of the type of a shift register which is shifted once every eight main clock pulses.
  • a decoder 2 receives an input signal consisting of seven bits and identifies in its matrix and derives an output signal representing one of 128 symbols.
  • a main clock pulse generator 3 generates pulses of for example 30kc. which may be used as unit bright line timing pulses synchronizing pulses for the waveform shaping circuit, shifting pulse for the buffer register, etc.
  • a waveform shaping circuit 4 comprises four oscillators for generating four fundamental waves of Sin T, Sin 3T, Tri T and Tri 3T and a matrix for determining the levels L L 1.. and L and the heights of A, h and thereby shaping all of the waveforms required for reconstructing a symbol.
  • a bright line timing pulse generator 5 generates various combinations of bright line timing pulses by an octal counter which counts the main timing clock pulses so that the time for exciting the faceplate to luminescence for constructing all of the symbols may be determined.
  • a waveform OR-circuit 6 is for combining into one output signal the signals ofthe decoder 2 which select the same waveforms in each scanning.
  • a bright line OR-circuit 7 is similar in function to the waveform OR-circuit. That is, the circuit 7 serves to combine into one output signal the input signals which select the same bright line.
  • a waveform selection matrix 8 selects a suitable waveform generated by the waveform shaping circuit 4 depending upon the output from the waveform OR-circuit 6.
  • a bright line selection matrix 9 selects the bright line timing pulses from the bright line generator 5 depending upon the output from the bright line OR-circuit 7.
  • Reference numeral 10 designates a sweep pulse generator (44.5c.); 11, a constant current source for a focusing coil; l2, l3 and 14 are amplifiers, the output of the amplifier 12 being applied to the vertical deflection electrodes or coil, the output of the amplifier 13, to the brightness grid and the output of the amplifier 14, to the horizontal deflection coil or electrodes.
  • the information for one line is applied to the buffer register and circulated in the register until four scannings (for the preceding line) are accomplished in CRT.
  • the buffer register Upon initiation of the first horizontal scanning, the information in the buffer register is applied to the decoder so that the waveforms and bright lines for one symbol are selected. Upon completion of the first horizontal scanning, the buffer register is reset to its initial state. Four horizontal scannings are effected in four circulations in the buffer register.
  • the waveform pulses selected at each of four horizontal scannings are applied to the vertical deflection electrodes or coil of CRT while the selected bright line pulses, to the brightness grid.
  • the horizontal scanning pulses which are tooth-shaped are applied to the horizontal deflection electrodes or coil.
  • a character-display device for displaying simultaneously a plurality of symbols arranged in juxtaposed relation in one line comprising a cathode-ray tube having a faceplate;
  • fundamental waveform generating means for producing a plurality of fundamental waveforms responsive to input data
  • blanking means for selectively illuminating said faceplate at selected portions of said deflecting waveforms so that said symbols are constructed of segments corresponding to portions of said deflecting waveforms.
  • each of said symbols is divided into a plurality of horizontal segments, said blanking means energizing selected ones of said segments on said faceplate as said beam horizontally scans said faceplate to construct said symbols.
  • a character-display device as claimed in claim 1, comprising a decoder wherein said fundamental waveform generating means comprises a matrix, said symbols to be displayed being supplied to said decoder, said decoder being connected to said matrix for selecting at least one of said fundamental waveforms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)
US841795A 1968-07-15 1969-07-15 Display device for displaying simultaneously a plurality of symbols arranged in juxtaposed relation in one line Expired - Lifetime US3631456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4904168 1968-07-15

Publications (1)

Publication Number Publication Date
US3631456A true US3631456A (en) 1971-12-28

Family

ID=12819982

Family Applications (1)

Application Number Title Priority Date Filing Date
US841795A Expired - Lifetime US3631456A (en) 1968-07-15 1969-07-15 Display device for displaying simultaneously a plurality of symbols arranged in juxtaposed relation in one line

Country Status (5)

Country Link
US (1) US3631456A (enrdf_load_stackoverflow)
DE (1) DE1935969B2 (enrdf_load_stackoverflow)
FR (1) FR2014608A1 (enrdf_load_stackoverflow)
GB (1) GB1275761A (enrdf_load_stackoverflow)
NL (1) NL6910740A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711849A (en) * 1971-03-08 1973-01-16 Vector General Character font generating system for cathode-ray tube displays, or the like
US3810166A (en) * 1972-05-05 1974-05-07 Aston Electronic Dev Ltd Electronic character generating systems
US4335380A (en) * 1980-06-16 1982-06-15 Wright David Y Multi-beam raster scan display monitor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522380A (en) * 1948-07-09 1950-09-12 Du Mont Allen B Lab Inc Correcting position of undeflected spot on multigun cathode-ray tubes
US2763808A (en) * 1956-09-18 lurcott
US2978608A (en) * 1956-12-24 1961-04-04 Ibm Character synthesizing tube
US3342936A (en) * 1965-03-31 1967-09-19 Paillard Sa Circuit for producing complex electric signals of predetermined amplitude and phase for controlling character forming means
US3524998A (en) * 1968-01-26 1970-08-18 Tektronix Inc Resistive conversion device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763808A (en) * 1956-09-18 lurcott
US2522380A (en) * 1948-07-09 1950-09-12 Du Mont Allen B Lab Inc Correcting position of undeflected spot on multigun cathode-ray tubes
US2978608A (en) * 1956-12-24 1961-04-04 Ibm Character synthesizing tube
US3342936A (en) * 1965-03-31 1967-09-19 Paillard Sa Circuit for producing complex electric signals of predetermined amplitude and phase for controlling character forming means
US3524998A (en) * 1968-01-26 1970-08-18 Tektronix Inc Resistive conversion device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711849A (en) * 1971-03-08 1973-01-16 Vector General Character font generating system for cathode-ray tube displays, or the like
US3810166A (en) * 1972-05-05 1974-05-07 Aston Electronic Dev Ltd Electronic character generating systems
US4335380A (en) * 1980-06-16 1982-06-15 Wright David Y Multi-beam raster scan display monitor

Also Published As

Publication number Publication date
DE1935969B2 (de) 1971-05-27
NL6910740A (enrdf_load_stackoverflow) 1970-01-19
DE1935969A1 (de) 1970-01-29
FR2014608A1 (enrdf_load_stackoverflow) 1970-04-17
GB1275761A (en) 1972-05-24

Similar Documents

Publication Publication Date Title
US3845243A (en) System for producing a gray scale with a gaseous display and storage panel using multiple discharge elements
US3699531A (en) Digital data selection and display system
EP0192655B1 (en) Method and apparatus for operating a display monitor
GB1599733A (en) Microcomputer for use with video display
US4095216A (en) Method and apparatus for displaying alphanumeric data
JPH0473110B2 (enrdf_load_stackoverflow)
US3624634A (en) Color display
JPS5991375A (ja) 同期発生器により制御されるビデオ試験装置
US3418518A (en) Cathode ray tube dot matrix shifting
EP0137619B1 (en) Display screen touch position detection apparatus
EP0004797A2 (en) Video display control apparatus
US4156238A (en) Display apparatus having variable text row formating
US3336498A (en) Cathode ray tube character generating and display system
US3631456A (en) Display device for displaying simultaneously a plurality of symbols arranged in juxtaposed relation in one line
US4081799A (en) Character generation system for a visual display terminal
US4205310A (en) Television titling apparatus and method
US4286264A (en) Signal generator for a graphic console
GB1309698A (en) Symbol display system
JPS6037498B2 (ja) ビデオスクリ−ンの座標検出方法
US4231032A (en) Variable accuracy trend graph display apparatus
JPH0616230B2 (ja) マルチスクリ−ン表示方法
US4345243A (en) Apparatus for generating signals for producing a display of characters
US4090187A (en) Television titling system for producing overlapping characters
US3735385A (en) Circuit arrangement for character display
US4719456A (en) Video dot intensity balancer