|Publication number||US3631457 A|
|Publication date||Dec 28, 1971|
|Filing date||Sep 8, 1969|
|Priority date||Sep 9, 1968|
|Publication number||US 3631457 A, US 3631457A, US-A-3631457, US3631457 A, US3631457A|
|Inventors||Hamada Nagaharu, Hayashi Yukitaka, Miyanaka Motosi, Suzuki Yasuo, Yasuda Isao|
|Original Assignee||Hitachi Ltd|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (16), Classifications (9)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Primary Examiner-John W. Caldwell Assistant Examiner David L. Trafton Attorney-Craig, Antonelli & Hill ABSTRACT: A display apparatus having a keyboard for encoding elements for the display of various characters, symbols or graphs by the combination of dots on a cathode ray tube operated in accordance with the standard television system, and MOS (Metal Oxide Semiconductor) dynamic shift registers for storing the codes representing the characters, symbols on graphs to be displayed. A video signal according to the codes applies intensity modulation to the scanning lines or tasters thereby to effect the desired display on the cathode ray tube. Renewal of displayed character can be effected by displaying a cursor at a renewed position on the cathode ray tube and manipulating the keyboard.
lnventors Nagaharu Hamada Hitachi-chi; Mot/oat Mlyanaltn, Kumagegun, Ynmaguehl-ken; YIIIIO Suzuki; hao Yasuda; Yukltaka Bayaahl, all of Hitachi shl, all of Japan Appl. No. 855,804 Filed Sept. 8, 1969 Patented Dec. 28, 1971 Assignee Hltaehl, Ltd.
Tokyo, Japan Priorities Sept. 9, 1968 Japan 43/6426 1; Jan. 30, 1969, Japan, No. 44/7110; Jan. 30, 1969, Japan, No. 44/8499 DISPLAY APPARATUS 5 Claims, 21 Drawing Figs.
15. Cl. 340/324 A, 340/ 1 72.5 Int. Cl G06! 3/14 Field of Search 340/324 A, 220
3 4 J 1 04 7A H'i'OCESSM/G my IG'YBOGRD mm AND HUM/7Z7? GOVT/POL W727? GEM/M701? DISPLAY BASIC CONTROL Patented Dec. 28, 1971 CHARACTFRSH ICE (Pf/7 )C/MMCTEP 18 Sheets-Sheet 1 CHARAcER SPACE r [-m L/NE 7 *L/NESPACE LWESPACE' INVENTORS BY 11?,W Jilwadvmu ATTORNEYS Patented Dec. 28, 1971 3,631 ,457
18 Sheets-Sheet 8 3 4 6 7 J J S 2 DATA PROCESS/N6 CHARACTER MEMORY a-RAr0R DIS/OLA Y 5 r J 2 S KEYBOARD MEMORY BASIC AND HP/NTER CUNTROL CONTROL ONE ICl-MRACIFR CURSOR A r SHIFT PULSE I l SH/Fr PLL$I INVENTORS nmblhnm dl'ldacb moTaS mama usu sucuKi sap Y udul BY fiuKcRKa. Hu
6% 0 19? I, I w ATTORNEY;
18 Sheets-Sheet 6 FIG. 60
INVENTORL D him "0 OSI m usuo Suz K] BY Y0 Rd W 5h.
Patented Dec. 28, 1971 18 Sheets-Sheet 9 bm b 9% mmnvm M Tw 0 hww U u Patented Dec. 28, 1971 3,631,457
18 Sheets-Sheet 1 l 40 cmmcrzns 5 CHARACTERS 5 CHARACTERS lHl lllll lllllllllllilllIIIIIIIHIIHI llIlHl DISPLAY WR/I'E m/ MEMORY46 IN VENTORS BY YUKfr-sk' 1311 Mu M Q ATTORNEYS Patented Dec. 28, 1971 3,631,457
18 Sheets-Sheet 15 INVENTOI6 Patented Dec. 28, 1971 3,631,457
18 Sheets-Sheet 14.
HOP/ZONTAL COUNTER COUNTER HOQ/ZONZ IL l4 POS/T/O/V HORIZONTAL DOT ADDRESS 056005? n ml N V E N TO RS 3%) fr; :I K i 3500 Su 33s vi il BY 6% H1 mum ATTOR NI'LYS Patented Dec. 28, 1971 18 Sheets-Sheet 1 B NQQQQMQ WMMQQQ? Patented Dec. 28, 1971 18 Sheets-Sheet 16 VERT/CAL SYNCS/GML FIG I20 COUNTER VERTICAL ROS/T/ON COUNTER VERT/CAL OUT yi soo 5mm? mg dd, YUKI INVENTOI6 *Nda.
si "M tsu ATTORNEYS Patented Dec. 28, 1971 18 Sheets-Sheet 17 S L l 2 mumm w w mwwmaw hmm 0 olsPLAv APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a display apparatus.
2. Description of the Prior Art A remarkable increase in the amount of information handled by electronic computers is seen as the size of electronic computers becomes larger, and therefore it is desired to simplify the means available for man-machine communication.
Various types of character display apparatus, pattern display apparatus and the like have been developed and some of them have been disclosed, for example, in the Japanese in ine "Fuji" Vol. 12, No. 4 and the Japanese magazine OI-1M Feb. I968.
However, the known apparatus of this kind are relatively costly and involve economical problems. Thus, it is the present practice that the apparatus of this kind is not so popularly used as to match the increase in the amount of information in spite of the emphasis placed on the necessity for such apparatus. These problems mainly arise from the fact that the apparatus employ a special cathode-ray tube in the display section which includes a complex control circuit. Therefore, the appearance of an economical display apparatus employing a cathode-ray tube commonly used in commercial television sets and an inexpensive control circuit are strongly required.
SUMMARY OF THE INVENTION The present invention proposes a display apparatus in which intensity modulation is applied to scanning lines of a cathoderay tube with suitable timing so as to display a character, symbol or pattern by an assembly of bright spots or dots, that is, by a suitable combination of horizontal and vertical dots. According to the present invention, the display section may merely consist of a television receiver of the standard television system, and circulating memories, such as delay line memories or dynamic shift registers, are employed in the control circuit to obtain an inexpensive display apparatus.
It is a primary object of the present invention to provide an inexpensive and highly reliable display apparatus.
Another object of the present invention is to provide a display apparatus which can display patterns including a graph in spite of a very small memory capacity.
Other objects, features and advantages of the present invention will be apparent from the following detailed description taken in conjunction wifli the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a diagram illustrating the basic principle of the present invention.
FIG. 2 is a block diagram showing the basic structure of the present invention.
FIG. 3 is a block diagram for the explanation of a basic control circuit and a character-generating circuit in an embodiment of the present invention.
FIGS. 4 and 5 show a time chart for the explanation operation of the circuits shown in FIG. 3.
FIG. 6a is a block diagram showing the structure of a memory 4 in the embodiment of the present invention.
FIG. 6b is a circuit diagram of one of the blocks shown in FIG. 60.
FIGS. 7a and 7b are block diagrams respectively showing the structure of a memory control circuit and a cursor control circuit in the embodiment of the present invention.
FIGS. 80 and 8!: show a time chart for the explanation of the operation of the memory control and cursor control.
, FIG. 9 is a block diagram showing the structure of a circuit for writing data from a keyboard in the memory in the embodiment of the present invention.
FIG. [0 shows a time chart for the explanation of operation of the circuit shown in FIG. 9.
FIG. 11 is a diagram illustrating how a pattern and a character are simultaneously displayed by the present invention.
FIGS. 12a through 12d illustrate a circuit diagram of another embodiment of the present invention for effecting a display as shown in FIG. 11.
FIG. 13 is a view showing the relation between FIGS. 12a, 12b, 12c and IZd.
FIG. 14 is a block diagram showing a practical example comprising a combination of a display apparatus and a television receiver.
FIG. I5 shows a time chart for the explanation of write-in operation with a high-speed shift register.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with regard to an example in which a television receiver of the standard television system (horizontal synchronizing frequency of 15.75 kHz. and vertical synchronizing frequency of 60 Hz. com monly used in Japan and the United States is utilized in the display section of the display apparatus according to the present invention.
FIG. 1 is a diagram illustrating the basic principle of the present invention. FIG. Ia shows diagrammatically a part of the display on the screen of a cathode-ray tube. In FIG. la, y,, y,,-,ay y,, y,,-represent the scanning lines running across the face of a cathode-ray tube in the horizontal direction (Ilyback lines are not shown herein), while 1,, x r x x,, represent the timing for applying intensity modulation to the scanning lines. It will be seen from FIG. Ia that, in accordance with the present invention, intensity modulation is applied to the rasters with suitable timing so as to display a character, symbol or pattern by an assembly of bright spots or dots. Thus, special deflection circuits are not required for the display and a television receiver of the standard television system can be utilized. In accordance with the present invention, the video signal corresponding to the respective raster may be controlled in a manner as seen in FIG. lb so that they can display a specific character or symbol. In the case of FIG. I, I4 rasters are allotted to one line of a character or symbol to be displayed, with 7 rasters being used for display and the remaining rasters are used to provide a space between lines, while in the horizontal direction, eight dots are allotted, with five dots used for display and the remaining dots used to provide a space between characters or symbols. According to this example, therefore, any desired character or symbol can be displayed by the combination of 35 dots consisting of five horizontal dots and seven vertical dots.
Referring to FIG. 2 which is a block diagram showing the basic structure of the present invention, the display apparatus comprises a keyboard and printer unit I, a memory control circuit 2, a data processing unit 3 such as a computer or data logger, a memory 4, a basic control circuit 5, a charactergenerating circuit 6 and a display unit 7. The keyboard and printer unit I writes in desired characters or symbols and prints displayed characters or symbols for preservation. The memory control circuit 2 controls the acceptance and delivery of data between the keyboard and printer unit I, the computer 3 and the memory 4 and readout of data from the memory 4 for delivery to the character-generating circuit 6 for the sake of display. The memory 4 stores the code of the characters to be displayed on the screen and effects readout and write-in of data under the control of the memory control circuit 2. The basic control circuit 5 produces the horizontal and vertical synchronizing signals to be applied to the display unit 7, and at the same time, applies signals designating the position of the characters, space between characters and space between lines to the character-generating circuit 6 and memory control circuit 2. The character-generating circuit 6 generates a video signal according to the timing designated by the basic control circuit 5 on the basis of the code supplied from the memory 4 and delivers the video signal to the display unit 7. The display unit 7 displays a character or symbol on the face of a cathode ray tube when it receives the video signal described above and the synchronizing signals supplied from the basic control circuit 5. A display apparatus having a plurality of input units
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|International Classification||G09G5/08, G09G5/00, G06F3/153, G09G5/22|
|Cooperative Classification||G09G5/222, G09G5/08|
|European Classification||G09G5/08, G09G5/22A|