CA1254682A - Display terminal control system - Google Patents
Display terminal control systemInfo
- Publication number
- CA1254682A CA1254682A CA000484432A CA484432A CA1254682A CA 1254682 A CA1254682 A CA 1254682A CA 000484432 A CA000484432 A CA 000484432A CA 484432 A CA484432 A CA 484432A CA 1254682 A CA1254682 A CA 1254682A
- Authority
- CA
- Canada
- Prior art keywords
- display
- image
- buffer memory
- data
- terminal
- 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
Links
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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
- G09G5/39—Control of the bit-mapped memory
- G09G5/391—Resolution modifying circuits, e.g. variable screen formats
Abstract
ABSTRACT OF THE DISCLOSURE
A display terminal control system applied to an image information terminal is disclosed, which includes a system control circuit, a display control circuit having a display buffer memory, the operation thereof being managed by the system control circuit, a coupler connected to the system control circuit for coupling the image information terminal to a data center and a keyboard connected to the system con-trol circuit, wherein the keyboard has a multi-image control key which enables a multi-image display for normal image data sequentially supplied from the data center.
A display terminal control system applied to an image information terminal is disclosed, which includes a system control circuit, a display control circuit having a display buffer memory, the operation thereof being managed by the system control circuit, a coupler connected to the system control circuit for coupling the image information terminal to a data center and a keyboard connected to the system con-trol circuit, wherein the keyboard has a multi-image control key which enables a multi-image display for normal image data sequentially supplied from the data center.
Description
lZ~
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to a display terminal for a character-image information system such as Videotex 8RIEF DESCRIPTION OF THE DR~WINGS
Fig. 1 is a ~lock diagram showing an example of a prior art character-image lnformation system to which the present invention is applied;
Figs. 2, 3 and 4 are respectively diagrams useful for explaining the character-image information system shown in Fig. l;
Fig. 5 is a diagram showing a part of an example of a key~oard used in an em~odiment of a display terminal control system according to the present invention;(appearing on the same sheet as Fig.-l); and Fig. 6 is a flow chart useful for explaining the operation of the main part of the em~odiment of the display terminal control system accord~ng to t~is invention.
Descr~ption of the Pri~r Art Tnere ha~e been propose~ character-image inormation systems such as~CAPT~N ~ ~cnaracter and pattern telephone acces~s ~ssformation networkl system and N~PLPS ~ tNorth American Presentation Le~el Protocol Syntax~.
F~g. 1 schemati`cally shows an example of such character-~mage information system. In Fig. 1, reference numeral 10 designates ~ data center for transm~tting a character-image informat~on to a user terminal 30. The data center 10 and the user terminal 30 are coupled with ~4~
4~;~2 each other through a telèphone cable 1, for example, so that the bidirectional data communication can ~e carried out therebetween.
The user terminal 30 is prov~ded with a m;crocomputer and this microcomputer comprises a CPU (central processing unitl 31, a ROM (read only memory~ 32 whicn stores a pro-gram for controlling the functions of the system such as reception, display, print and transmission or the like and a R~ ~random access memory) 33.
Reference numeral 21 designates a MODEM (modulator and demodulator) and this MODEM 21 demodulates a modulated data transm~tted ~rom the data center 10 to the user terminal 30 or modulates a signal transm~tted from the user terminal 30 to the data center 10, The MODEM 21 is connected through an I/O port 34 to a system bus 35.
Refexence numeral 22 desig~ates a keyboard and 23 a printer for mak~ng a nard copy of image ~nformation. They are connected to the system bus 35 through r~o ports 36 and 37~ ~espect~vely~.
Reference numeral 24 designates a video R~M which stares a display data of one page amount (one picture frame amountl, 25 a memory controller for orming an address signal and read and write s~gnals of the video ~AM 24 and, 26 a CRT (cathode ray tubel or display controller which contxols a CRT or mon~tor 27 to display an image informa-tion, The~ are connected one another and to the system bus 35, respectively.
When a desired image information is selected by the 1254~
keyboard 22, the CPU 31 accepts it so that an information request signal is supplied through the I/O port 34 to the MODEM 21 in which it is modulated and thus modulated inform-ation request signal is supplted through the telephone cable 1 to the data center 10.
When t~e data center 10 is supplied with such request signal, the data center 10 modulates the requested image information and transmits the modulated image information to the user terminal 30. rn the user termtnal 30, the image ~nform~t~on ~s demodulated ~y the MODEM 21, stored through the ~O port 34 to tne ~AM 33 and then ~ritten ln the video RAM 24 ~n turn.
The memory controller 25 forms a read address sign~l and a read signal which are in synchronism wlth ~ert~c~l and horizontal scannings. These signals are respect~ely supplied to the video RAM 24 in a time-division m~nne~ w~t~
a write signal so that the display data is sequentially read out from the video RAM 24 in synchronism wlth t~e ~ert~cal and horizontal scannings. The display data read out ~rom the video RAM 24 is decoded to three prl~ary color s~gnal$
R, G and B by the video controller 26 and they are fed to the monitor 27. Thus the color picture image transmitted from the data center 10 is displayed on the display screen of the monitor 27. When a hard copy request key tnot shown) of the keyboard 22 is depressed, the display data is supplied through the I/O port 37 to the printer 23 ln which it is printed out on a printing paper. Thus the hard copy of the display data can be made as required.
1~5~ 2 For example, the CAPTAIN system uses as its format a normal mode and a multi-image mode to transmit an image data. Further, the multi-image mode includes a center-oriented multi-image mode and a terminal-oriented multi-image mode. In this case, in the terminal-oriented multi-image mode, ~he user can watch the plurality of images of normal mode as multi-images simultaneously. More particu-larly, in the picture frame of a screen of the monitor 27, one page is formed by 496 dots x 408 dots as shown in Fig.
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to a display terminal for a character-image information system such as Videotex 8RIEF DESCRIPTION OF THE DR~WINGS
Fig. 1 is a ~lock diagram showing an example of a prior art character-image lnformation system to which the present invention is applied;
Figs. 2, 3 and 4 are respectively diagrams useful for explaining the character-image information system shown in Fig. l;
Fig. 5 is a diagram showing a part of an example of a key~oard used in an em~odiment of a display terminal control system according to the present invention;(appearing on the same sheet as Fig.-l); and Fig. 6 is a flow chart useful for explaining the operation of the main part of the em~odiment of the display terminal control system accord~ng to t~is invention.
Descr~ption of the Pri~r Art Tnere ha~e been propose~ character-image inormation systems such as~CAPT~N ~ ~cnaracter and pattern telephone acces~s ~ssformation networkl system and N~PLPS ~ tNorth American Presentation Le~el Protocol Syntax~.
F~g. 1 schemati`cally shows an example of such character-~mage information system. In Fig. 1, reference numeral 10 designates ~ data center for transm~tting a character-image informat~on to a user terminal 30. The data center 10 and the user terminal 30 are coupled with ~4~
4~;~2 each other through a telèphone cable 1, for example, so that the bidirectional data communication can ~e carried out therebetween.
The user terminal 30 is prov~ded with a m;crocomputer and this microcomputer comprises a CPU (central processing unitl 31, a ROM (read only memory~ 32 whicn stores a pro-gram for controlling the functions of the system such as reception, display, print and transmission or the like and a R~ ~random access memory) 33.
Reference numeral 21 designates a MODEM (modulator and demodulator) and this MODEM 21 demodulates a modulated data transm~tted ~rom the data center 10 to the user terminal 30 or modulates a signal transm~tted from the user terminal 30 to the data center 10, The MODEM 21 is connected through an I/O port 34 to a system bus 35.
Refexence numeral 22 desig~ates a keyboard and 23 a printer for mak~ng a nard copy of image ~nformation. They are connected to the system bus 35 through r~o ports 36 and 37~ ~espect~vely~.
Reference numeral 24 designates a video R~M which stares a display data of one page amount (one picture frame amountl, 25 a memory controller for orming an address signal and read and write s~gnals of the video ~AM 24 and, 26 a CRT (cathode ray tubel or display controller which contxols a CRT or mon~tor 27 to display an image informa-tion, The~ are connected one another and to the system bus 35, respectively.
When a desired image information is selected by the 1254~
keyboard 22, the CPU 31 accepts it so that an information request signal is supplied through the I/O port 34 to the MODEM 21 in which it is modulated and thus modulated inform-ation request signal is supplted through the telephone cable 1 to the data center 10.
When t~e data center 10 is supplied with such request signal, the data center 10 modulates the requested image information and transmits the modulated image information to the user terminal 30. rn the user termtnal 30, the image ~nform~t~on ~s demodulated ~y the MODEM 21, stored through the ~O port 34 to tne ~AM 33 and then ~ritten ln the video RAM 24 ~n turn.
The memory controller 25 forms a read address sign~l and a read signal which are in synchronism wlth ~ert~c~l and horizontal scannings. These signals are respect~ely supplied to the video RAM 24 in a time-division m~nne~ w~t~
a write signal so that the display data is sequentially read out from the video RAM 24 in synchronism wlth t~e ~ert~cal and horizontal scannings. The display data read out ~rom the video RAM 24 is decoded to three prl~ary color s~gnal$
R, G and B by the video controller 26 and they are fed to the monitor 27. Thus the color picture image transmitted from the data center 10 is displayed on the display screen of the monitor 27. When a hard copy request key tnot shown) of the keyboard 22 is depressed, the display data is supplied through the I/O port 37 to the printer 23 ln which it is printed out on a printing paper. Thus the hard copy of the display data can be made as required.
1~5~ 2 For example, the CAPTAIN system uses as its format a normal mode and a multi-image mode to transmit an image data. Further, the multi-image mode includes a center-oriented multi-image mode and a terminal-oriented multi-image mode. In this case, in the terminal-oriented multi-image mode, ~he user can watch the plurality of images of normal mode as multi-images simultaneously. More particu-larly, in the picture frame of a screen of the monitor 27, one page is formed by 496 dots x 408 dots as shown in Fig.
2, while in the normal mode, 2 dots each in the horizontal and vert~cal directions, or 4 dots in total are expressed by the same information as shown by cross-hatched circles in Fig. 2 so that the picture frame of the normal mode becomes equal to th.e picture frame in which one page is formed of 248 dots x 2Q4 dots.
Tn the multi-image mode, one page is formed of 496 dots x 408 dots and one picture frame of the screen is divided into 4 equal parts and then 4 small picture frames #1 to ~4 can ~e displayed as shown in Fig. 3. Also t~e memoxy area of the ~ideo RAM 24 is d~vided into 4 equ~l areas ~1 to A4 corresponding to the 4 small picture frames ~1 to ~t4 as snown in Fig. 4.
In th.e terminal-oriented multi-image mode, the ~mage information or data of each picture frame transmitted from the data center 10 are stored in th.e areas Al to ~4 of tne video ~M 24. When picture frames are sequentially trans-mitted from the data center lQ, the image information ~.s sequentially written in the areas Al to A4 of t~e video .d~ - 5 -RAM 24 in the order of Al A2 A3 A4 ~1 2 Accordingly, on the screen of the monitor 27, each of the 4 small picture frames #1 to #4 displays a different display information and is changing its display content as a 5 signal is transmitted from the data center 10.
By the way, in the terminal-oriented multi-image mode, there is such a case where the user wants to watch any one of the 4 small picture frames #1 to #4 in an unchanged or fixed state. However, such user's request can not be satis-fied because the existing display terminal is not yet rendered such a function as to ~e able to satisfy it as earlier noted. On the contrary, the content or data stored in the video RAM 24 is seq-lentially rewritten by the inform-ation transmitted from the data center 10 and thence the desired small picture frame of sma:ll picture frames ~n multi-image mode can not be made unchanged.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an object of this invention to provide a display terminal control system in which in a terminal-oriented multi-image mode, a desired plcture frame of multi-picture frames can be watched in a ~ixed state.
It is another ob~ect o this invention to provide a display terminal control system for use with a character-image information system such as Videotex.
~ccord~ng to one aspect of t~e present invention, there is provided a display control system applied to an image information terminal comprising:
system control means;
~4~
display control means having a display buffer memory, the operation thereof being manag0d by said system control means;
coupling means connected to said system control means for coupling said image information terminal to a data center; and a keyboard connected to said system control means, wherein said keyboard has a multi-image control key which enables a multi-image display for a normal image data sequentially supplied from said data center.
These and other objects, features and advantages of the present lnventlon will become apparent from the following detailed description of the preferred embodiment taken in conjunction with the accompanying drawings throughout which like reference numerals designate like elements and parts.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Now, an embocliment of a display terminal control system accordlng to this invention will hereinafter be descri~ed in detail with reference to the drawings.
Fig. 5 shows a part of the keyboard 22 used in t~e dis-play term~nal control system of this i~vent~n. ~e~e~ng to Fig. 5, the keyboard 22 is pro~icled with 4 image frame fix keys Fl to F~.
Reference numeral 22M designates a multi-image request key. When this key 22M is depressed, the user termlnal ls placed in the terminal-oriented multi-image mode. Of course, the user terminal 30 is set in the multi-image mode when the data of multi-image mode is transmitted from the data center 10. In such case, regardless of this key 22M, in accordance with the request of the data center 10, the user texminal 30 is placed in the center-oriented multi-image mode.
In the terminal-oriented multi-image mode, a desired small picture frame can be fixed as follows.
Fig. 6 is a flow chart of a control program taken in steps for fixing the desired small picture frame and such small picture frame can ~e fixed on the ~asis of this program.
Firstly, in step 101, the depression of the key 22M
is detected.
If the key 22M is not depressed, the user terminal 30 IS put into the normal mode in which the image data of a single picture frame with respect to one page is written in the video - 7a -RAM 24 ~at step 201). If, on the other hand, the key 22M is depressed, an area pointer P is set for the memory areas A1 to A4 corresponding to the respective small picture frames #1 to #4 of the video RA~l 24 (at step 102). At first, the pointer P is set to "1", and the depression of the fix key Fi for the area Ai is checked at step 103. This is decided by a flag F(i), because when the fix key Fi corresponding to the area Ai of pointer P (P
=i, i=1, 2, 3 or 4) is depressed, the flag F(i) becomes "1", otherwise "0". Accordingly, if the key F1 is depressed, F(i)="1"
is established so that this state is judged and the image data is prohibited from being written in the video RAM 24 at its address in which the image data of the area A1 is stored (at step 104).
Then, "1" is added to a data SR which indicates the number of the fixed small picture frames and then stored in a search register L5 (work area of the RAM 33) in step 105. Whether the data SR indic-ative of the content or data stored in the search register is "4"
or not, or whether al:L the 4 small picture frames #1 to #4 are fixed or not is judged (at step 106). If SR~4, the pointer P is set for the memory area Az of the next small picture frame #2, or ~o P=2 is established. If the corresponding fix key F2 is not de-pressed, F(2)="0" is established so that this state is judged at step 103. Then, the image data from the data center 10 is written in the memory area A2 (at step 108). That is, the memory area Al is skipped and the image da-ta i.s wri.ttetl ln th~ tnetnory area ~2.
As described above, when the smaL1 picture frame is not fixed and the memory area in which the image data from the data center 10 can be stored exists, the content or data SR of the search regis-ter is reset (SR=0) in step 109 and the routine is returned to t.he main program.
0 If, on the other hand, the frame fix keys F1 to F4 are l~S4682 all depressed and all of the 4 small picture frames are fixed, the routine from steps 102 to 106 is repeated. If SR=4 is judged in step 106, from the user terminal 30, a stop code is generated at step 107.
As described above, if the frame fix key is depressed, the image data is prohibited from being written in the correspond-ing address area of the memory and hence the image data produced when the frame fix key is depressed is displayed as the small picture frame in the fixed state. In addition, although the data L0 is prohibited from being written in the memory area, the image data, which is to be written in the prohibited memory area, is written in the memory area corresponding to the small picture frame whose frame fix key is not depressed so that the image data tranmitted from the data center 10 can be prevented from becoming useless.
.5 While in the above-mentioned embodiment the present invention is applied to the CAPTAIN system, it is needless to say that this invention can be applied to a television multiplex-character broadcast. In this case, however, the communication is the unidirectional communication from the broadcasting station 0 so that when the divided small picture frames are all fixed, the character-image data transmitted becomes useless.
According to this invention, as set forth above, in the multi-image mode, the user can watch the desired small picture frame in a fixed state. Accordingly, in the multi-image mode, if the information of a particular one picture of a particular small picture frame is very important for the viewer, such picture frame can be fixed and thence the display terminal control system of this invention is very advantageous in use.
The above description is given on a single preferred embodiment of the invention, but it will be apparent that many _ g _ Z
modifications and variations could be effected by one skilled in the art without departing from the spirits or scope of the novel concepts of the invention, so that the scope of the inven-tion should be determined by the appended claims only.
Tn the multi-image mode, one page is formed of 496 dots x 408 dots and one picture frame of the screen is divided into 4 equal parts and then 4 small picture frames #1 to ~4 can ~e displayed as shown in Fig. 3. Also t~e memoxy area of the ~ideo RAM 24 is d~vided into 4 equ~l areas ~1 to A4 corresponding to the 4 small picture frames ~1 to ~t4 as snown in Fig. 4.
In th.e terminal-oriented multi-image mode, the ~mage information or data of each picture frame transmitted from the data center 10 are stored in th.e areas Al to ~4 of tne video ~M 24. When picture frames are sequentially trans-mitted from the data center lQ, the image information ~.s sequentially written in the areas Al to A4 of t~e video .d~ - 5 -RAM 24 in the order of Al A2 A3 A4 ~1 2 Accordingly, on the screen of the monitor 27, each of the 4 small picture frames #1 to #4 displays a different display information and is changing its display content as a 5 signal is transmitted from the data center 10.
By the way, in the terminal-oriented multi-image mode, there is such a case where the user wants to watch any one of the 4 small picture frames #1 to #4 in an unchanged or fixed state. However, such user's request can not be satis-fied because the existing display terminal is not yet rendered such a function as to ~e able to satisfy it as earlier noted. On the contrary, the content or data stored in the video RAM 24 is seq-lentially rewritten by the inform-ation transmitted from the data center 10 and thence the desired small picture frame of sma:ll picture frames ~n multi-image mode can not be made unchanged.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an object of this invention to provide a display terminal control system in which in a terminal-oriented multi-image mode, a desired plcture frame of multi-picture frames can be watched in a ~ixed state.
It is another ob~ect o this invention to provide a display terminal control system for use with a character-image information system such as Videotex.
~ccord~ng to one aspect of t~e present invention, there is provided a display control system applied to an image information terminal comprising:
system control means;
~4~
display control means having a display buffer memory, the operation thereof being manag0d by said system control means;
coupling means connected to said system control means for coupling said image information terminal to a data center; and a keyboard connected to said system control means, wherein said keyboard has a multi-image control key which enables a multi-image display for a normal image data sequentially supplied from said data center.
These and other objects, features and advantages of the present lnventlon will become apparent from the following detailed description of the preferred embodiment taken in conjunction with the accompanying drawings throughout which like reference numerals designate like elements and parts.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Now, an embocliment of a display terminal control system accordlng to this invention will hereinafter be descri~ed in detail with reference to the drawings.
Fig. 5 shows a part of the keyboard 22 used in t~e dis-play term~nal control system of this i~vent~n. ~e~e~ng to Fig. 5, the keyboard 22 is pro~icled with 4 image frame fix keys Fl to F~.
Reference numeral 22M designates a multi-image request key. When this key 22M is depressed, the user termlnal ls placed in the terminal-oriented multi-image mode. Of course, the user terminal 30 is set in the multi-image mode when the data of multi-image mode is transmitted from the data center 10. In such case, regardless of this key 22M, in accordance with the request of the data center 10, the user texminal 30 is placed in the center-oriented multi-image mode.
In the terminal-oriented multi-image mode, a desired small picture frame can be fixed as follows.
Fig. 6 is a flow chart of a control program taken in steps for fixing the desired small picture frame and such small picture frame can ~e fixed on the ~asis of this program.
Firstly, in step 101, the depression of the key 22M
is detected.
If the key 22M is not depressed, the user terminal 30 IS put into the normal mode in which the image data of a single picture frame with respect to one page is written in the video - 7a -RAM 24 ~at step 201). If, on the other hand, the key 22M is depressed, an area pointer P is set for the memory areas A1 to A4 corresponding to the respective small picture frames #1 to #4 of the video RA~l 24 (at step 102). At first, the pointer P is set to "1", and the depression of the fix key Fi for the area Ai is checked at step 103. This is decided by a flag F(i), because when the fix key Fi corresponding to the area Ai of pointer P (P
=i, i=1, 2, 3 or 4) is depressed, the flag F(i) becomes "1", otherwise "0". Accordingly, if the key F1 is depressed, F(i)="1"
is established so that this state is judged and the image data is prohibited from being written in the video RAM 24 at its address in which the image data of the area A1 is stored (at step 104).
Then, "1" is added to a data SR which indicates the number of the fixed small picture frames and then stored in a search register L5 (work area of the RAM 33) in step 105. Whether the data SR indic-ative of the content or data stored in the search register is "4"
or not, or whether al:L the 4 small picture frames #1 to #4 are fixed or not is judged (at step 106). If SR~4, the pointer P is set for the memory area Az of the next small picture frame #2, or ~o P=2 is established. If the corresponding fix key F2 is not de-pressed, F(2)="0" is established so that this state is judged at step 103. Then, the image data from the data center 10 is written in the memory area A2 (at step 108). That is, the memory area Al is skipped and the image da-ta i.s wri.ttetl ln th~ tnetnory area ~2.
As described above, when the smaL1 picture frame is not fixed and the memory area in which the image data from the data center 10 can be stored exists, the content or data SR of the search regis-ter is reset (SR=0) in step 109 and the routine is returned to t.he main program.
0 If, on the other hand, the frame fix keys F1 to F4 are l~S4682 all depressed and all of the 4 small picture frames are fixed, the routine from steps 102 to 106 is repeated. If SR=4 is judged in step 106, from the user terminal 30, a stop code is generated at step 107.
As described above, if the frame fix key is depressed, the image data is prohibited from being written in the correspond-ing address area of the memory and hence the image data produced when the frame fix key is depressed is displayed as the small picture frame in the fixed state. In addition, although the data L0 is prohibited from being written in the memory area, the image data, which is to be written in the prohibited memory area, is written in the memory area corresponding to the small picture frame whose frame fix key is not depressed so that the image data tranmitted from the data center 10 can be prevented from becoming useless.
.5 While in the above-mentioned embodiment the present invention is applied to the CAPTAIN system, it is needless to say that this invention can be applied to a television multiplex-character broadcast. In this case, however, the communication is the unidirectional communication from the broadcasting station 0 so that when the divided small picture frames are all fixed, the character-image data transmitted becomes useless.
According to this invention, as set forth above, in the multi-image mode, the user can watch the desired small picture frame in a fixed state. Accordingly, in the multi-image mode, if the information of a particular one picture of a particular small picture frame is very important for the viewer, such picture frame can be fixed and thence the display terminal control system of this invention is very advantageous in use.
The above description is given on a single preferred embodiment of the invention, but it will be apparent that many _ g _ Z
modifications and variations could be effected by one skilled in the art without departing from the spirits or scope of the novel concepts of the invention, so that the scope of the inven-tion should be determined by the appended claims only.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A display terminal control system applied to an image information terminal comprising:
system control means;
display control means having a display buffer memory, the operation thereof being managed by said system control means;
coupling means connected to said system control means for coupling said image information terminal to a data center; and a keyboard connected to said system control means, wherein said keyboard has a multi-image control key which enables a multi-image display for a normal image data sequentially supplied from said data center, a plurality of pages of display being stored in said display buffer memory during operation of said multi-image control key, said display control means further comprising means for prohibiting the writing of an image data into the corresponding area of said display buffer memory to one of said plurality of pages of display in response to selective operation of control keys which identify said plurality of pages of display.
system control means;
display control means having a display buffer memory, the operation thereof being managed by said system control means;
coupling means connected to said system control means for coupling said image information terminal to a data center; and a keyboard connected to said system control means, wherein said keyboard has a multi-image control key which enables a multi-image display for a normal image data sequentially supplied from said data center, a plurality of pages of display being stored in said display buffer memory during operation of said multi-image control key, said display control means further comprising means for prohibiting the writing of an image data into the corresponding area of said display buffer memory to one of said plurality of pages of display in response to selective operation of control keys which identify said plurality of pages of display.
2. The display terminal control system as cited in claim 1, wherein said display buffer memory is divided into 4 sections and 4 shrunk normal image data are stored in said respective sections.
3. The display terminal control system as cited in claim 2, wherein said keyboard has 4 fix keys corresponding to said 4 sections of said display buffer memory.
4. The display terminal control system as cited in claim 3, wherein said 4 sections of the display buffer memory are rewritten by the shrunk normal image data in a predetermined order.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP136677/84 | 1984-07-02 | ||
| JP59136677A JPS6115190A (en) | 1984-07-02 | 1984-07-02 | Display terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1254682A true CA1254682A (en) | 1989-05-23 |
Family
ID=15180890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000484432A Expired CA1254682A (en) | 1984-07-02 | 1985-06-19 | Display terminal control system |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4812998A (en) |
| EP (1) | EP0167332B1 (en) |
| JP (1) | JPS6115190A (en) |
| CA (1) | CA1254682A (en) |
| DE (1) | DE3585851D1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4924410A (en) * | 1986-02-13 | 1990-05-08 | Hitachi, Ltd. | Display control method and system |
| JP2503416B2 (en) * | 1986-05-02 | 1996-06-05 | 日本電気株式会社 | CRT display shared control device |
| JPS63106080A (en) * | 1986-06-27 | 1988-05-11 | Hitachi Ltd | Picture display system |
| JPS63102587A (en) * | 1986-10-20 | 1988-05-07 | Matsushita Electric Ind Co Ltd | Video tex terminal equipment |
| JP2590899B2 (en) * | 1987-07-24 | 1997-03-12 | 松下電器産業株式会社 | Character / graphic information display device |
| JPH0488477A (en) * | 1990-07-25 | 1992-03-23 | Matsushita Graphic Commun Syst Inc | Image display device |
| JP3350043B2 (en) * | 1990-07-27 | 2002-11-25 | 株式会社日立製作所 | Graphic processing apparatus and graphic processing method |
| US5440401A (en) * | 1990-09-14 | 1995-08-08 | Eastman Kodak Company | Image database incorporating low resolution index image data |
| JPH0511962A (en) * | 1990-10-10 | 1993-01-22 | Fuji Xerox Co Ltd | Window management device |
| US5250940A (en) * | 1991-01-18 | 1993-10-05 | National Semiconductor Corporation | Multi-mode home terminal system that utilizes a single embedded general purpose/DSP processor and a single random access memory |
| DE69301855T2 (en) * | 1992-04-21 | 1996-10-02 | Agfa Gevaert Nv | Method and device for displaying radiation images |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US31200A (en) * | 1861-01-22 | I H S White | Newspaper-file | |
| GB1479584A (en) * | 1973-07-14 | 1977-07-13 | Solartron Electronic Group | Data terminals and data processing apparatus incorporating such terminals |
| US4121283A (en) * | 1977-01-17 | 1978-10-17 | Cromemco Inc. | Interface device for encoding a digital image for a CRT display |
| US4290063A (en) * | 1979-08-03 | 1981-09-15 | Harris Data Communications, Inc. | Video display terminal having means for altering data words |
| JPS56119185A (en) * | 1980-02-23 | 1981-09-18 | Fujitsu Fanuc Ltd | Picture display system |
| JPS58143381A (en) * | 1982-02-19 | 1983-08-25 | 大日本スクリ−ン製造株式会社 | Method and apparatus for controlling intensity of light emitted from graphic display |
| US4509043A (en) * | 1982-04-12 | 1985-04-02 | Tektronix, Inc. | Method and apparatus for displaying images |
| US4532605A (en) * | 1982-04-12 | 1985-07-30 | Tektronix, Inc. | True zoom of a displayed image |
| US4533910A (en) * | 1982-11-02 | 1985-08-06 | Cadtrak Corporation | Graphics display system with viewports of arbitrary location and content |
| JPS59116787A (en) * | 1982-12-24 | 1984-07-05 | 株式会社日立製作所 | Display indication system |
| JPS59183458A (en) * | 1983-04-01 | 1984-10-18 | Hitachi Ltd | Picture retrieving system |
| FR2544898B1 (en) * | 1983-04-25 | 1985-07-19 | Texas Instruments France | DEVICE FOR VIDEO DISPLAY ON SCREEN FOR SCANNING A FRAME LINE BY LINE AND POINT BY POINT |
| US4611306A (en) * | 1983-05-11 | 1986-09-09 | International Business Machines Corp. | Display menu/chart key |
| US4591998A (en) * | 1983-12-01 | 1986-05-27 | The United States Of America As Represented By The Secretary Of The Air Force | Dynamic bar pattern method |
| US4646134A (en) * | 1984-03-21 | 1987-02-24 | Sony Corporation | Apparatus for encoding image signal |
| JPH0644814B2 (en) * | 1984-04-13 | 1994-06-08 | 日本電信電話株式会社 | Image display device |
| US4578535A (en) * | 1984-05-08 | 1986-03-25 | Telelogic, Inc. | Videotex system |
| US4691340A (en) * | 1984-11-28 | 1987-09-01 | Sony Corporation | Image information accessing user terminal |
| US4700378A (en) * | 1985-08-08 | 1987-10-13 | Brown Daniel G | Data base accessing system |
-
1984
- 1984-07-02 JP JP59136677A patent/JPS6115190A/en active Granted
-
1985
- 1985-06-19 CA CA000484432A patent/CA1254682A/en not_active Expired
- 1985-06-21 EP EP85304459A patent/EP0167332B1/en not_active Expired - Lifetime
- 1985-06-21 DE DE8585304459T patent/DE3585851D1/en not_active Expired - Lifetime
- 1985-06-26 US US06/748,958 patent/US4812998A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0167332A3 (en) | 1988-02-24 |
| EP0167332B1 (en) | 1992-04-15 |
| DE3585851D1 (en) | 1992-05-21 |
| JPS6115190A (en) | 1986-01-23 |
| US4812998A (en) | 1989-03-14 |
| JPH0528391B2 (en) | 1993-04-26 |
| EP0167332A2 (en) | 1986-01-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |