GB2165719A - Split-screen display arrangement - Google Patents

Split-screen display arrangement Download PDF

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Publication number
GB2165719A
GB2165719A GB08525338A GB8525338A GB2165719A GB 2165719 A GB2165719 A GB 2165719A GB 08525338 A GB08525338 A GB 08525338A GB 8525338 A GB8525338 A GB 8525338A GB 2165719 A GB2165719 A GB 2165719A
Authority
GB
United Kingdom
Prior art keywords
picture
display
signal
screen
displayed
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.)
Granted
Application number
GB08525338A
Other versions
GB8525338D0 (en
GB2165719B (en
Inventor
Masaaki Nakano
Izumi Iwasaki
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of GB8525338D0 publication Critical patent/GB8525338D0/en
Publication of GB2165719A publication Critical patent/GB2165719A/en
Application granted granted Critical
Publication of GB2165719B publication Critical patent/GB2165719B/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4112—Peripherals receiving signals from specially adapted client devices having fewer capabilities than the client, e.g. thin client having less processing power or no tuning capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
    • H04N21/4316—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/488—Data services, e.g. news ticker

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Marketing (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Studio Circuits (AREA)
  • Television Systems (AREA)

Abstract

A display device displays pictures in display areas divided along a horizontal line on the screen of a CRT display 5 and for this purpose, a CPU 1 sets in a selection value register 10, a value representing a horizontal border line of the divided display areas. A counter 9 counts a horizontal synchronizing signal and the count value is compared by a comparator 11 with the value set in the selection value register 10. Then, based on the output of comparison, a picture based on an entered video signal B and picture signal A read out from a frame memory 2 are displayed respectively in the divided display areas on the screen of the CRT display 5. Signal A from the frame memory 2 comprises a still picture e.g. teletext data, and may be scrolled. <IMAGE>

Description

SPECIFICATION Display device BACKGROUND OF THE INVENTION Field ofthe Invention The present invention relates to a display device.
More particularly, the present invention relates to a display device in which a dynamic picture and a still picture are displayed simultaneously or selectively on the screen of a CRT display.
Description of the Prior Art Recently, television text broadcast has been realized and apparatus for receiving such television text broadcast have been put into practical use. As one form of such television text broadcast, teletext is known. Atechnical document well known in the art concerning such teletext receiving apparatus is "LSI circuits forteletext and view data" (THE LUCY GENERATION Mullard Technical Publication M81 0001).
Fig. lisa schematic block diagram showing a display device in a conventional teletext receiving apparatus. First, referring to Fig. 1, a display device in a conventional teletext receiving apparatus will be described. To a CPU 1, a frame memory 2 and an offset register 6 are connected. The frame memory 2 has a display area corresponding to the screen of a CRT display 5 and stores picture data to be displayed . The offset register 6 stores the first address oftheframe memory 2 provided from the CPU 1.The first address stored in the offset register 6 is supplied to one input of an adder 7, while a read address of the frame memory 2 is supplied to the other input of the adder7 from a controller 4.
The adder 7 adds up thefirstaddress supplied from the offset register 6 and the read address supplied from the controller4so as to designate an address in the frame memory 2. Astill picture signal A based on the picture data read out from the frame memory 2 for displaying a still picture is supplied to a selector 3. To the selector 3, a dynamic picture signal B for displaying a dynamic picture is supplied from the exteriorthrough an inputterminal 12. The selector 3 is switched by a selection switch 8 so that eitherthe dynamic picture signal B entered from the input terminal 12 orthe still picture signal A based on the picture data read outfrom the frame memory 2 is supplied to the CRT display 5.
Now, the operation of the display device in the conventional teletext receiving apparatus will be described. First, the CPU 1 makes the offset register 6 store the address corresponding to the first scanning line of the screen ofthe CRT display 5. The adder 7 adds up the address stored in the offset register 6 and the read address supplied from the controller 4 so as to designate addresses in the frame memory 2 corresponding to thefirst scanning line of the screen.
In response to the designation of the addresses, the frame memory 2 reads out successively a still picture signal A. The still picture signal A is supplied to the selector 3.
On the other hand, in synchronism with the still picture signal A read outfrom the frame memory 2, the dynamic picture signal B entered from the exterior through the inputterminal 12 is su pplied to the selector 3. Eitherthe still picture signal A or the dynamic picture signal B is selecte by the selector 3 according to the switching of the selection switch 8.
Thus, the selected one ofthe pictures, namely, either the still picture orthe dynamic picture is displayed on the CRT display 5.
In the display device shown in Fig. 1, ifthe selection switch 8 selects the still picture signal A, the adder 7 adds to or subtractsfrom the first address stored in the offset register 6, the address from the controller 5, wherebythefirst address value read out of the frame memory 2 can be changed according to the screen for display and thus, display can be made on a scrolled screen.
However, the above stated display device can only display by selection, either a dynamic picture or a still picture on the CRT display 5 but cannot display simultaneously a dynamic picture and a still picture in divided areas on the CRT display 5. As a result, the above stated conventional display device has a drawback that a dynamic picture and still picture associated with each other cannot be displayed in parallel so that a viewer may compare or examine them.
SUMMARYOFTHE INVENTION Therefore, a principal objectofthe present invention isto provide a display device in which a still picture and a dynamic picture can be displayed in display areas divided on the CRT display and a scrolld picture can be displayed in the still picture display area.
Briefly stated, in the present invention, a value representing a horizontal border line dividing horizontally display areas on the screen of the CRT display is in advance by setting means so that pictures may be displayed in the divided display areas. Then, a synchronizing signal is counted and the count value and the value set by the setting means are compared.
In responsetothe comparison output signal, the screen ofthe CRT display is horizontally divided into display areas, so that a picture based on a video signal applied to an input terminal and a picture based on the picture data read out from a frame memory are selected by selecting means and displayed in the divided areas on the CRT display.
Consequently, according to the present invention, display areas on the screen ofthe CRT display are divided and a video signal based on a pictureto be displayed on a divided display area is selected according to the data representing the horizontal border line of the divided display areas and thus, a dynamic picture and a still picture can be displayed simultaneously in the divided display areas. In addition, only the still picture can be scrolled in a divided displayareaand accordingly,thedisplayfunctioncan be improved, which will lead to wider utilization.
BRIEF DESCRIPTION OFTHE DRAWINGS Fig. lisa schematic block diagram showing a conventional display device.
Fig. 2 is a schematic block diagram of an embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT Fig. 2 is a schematic block diagram of an embodiment ofthe present invention. First referring to Fig. 1, a structure of an embodimentofthe present invention will be described. In Fig. 2, the CPU 1, the frame memory 2, the selector3, the offset registeró and the adder7 are the same as shown in Fig. 1. The controller 4 is structured so as to generate a horizontal synchronizing signal in synchronism with a video signal based on the picture data read outfrom the frame memory 2.
The horizontal synchronization signal generated from the controller 4 is surlied to the counter 9.
The counter 9 counts the horizontal synchronizing signal and supplied the count outputto the comparator 11. The selection value register 10 stores a selection value representing a horizontal border line ofthe display areas divided horizontaily on the screen ofthe CRTdisplay 5.Thisselection vaiue is supplied from the CPU 1 to the selection value register 10. The selection value stored in the selection value register 10 is supplied to the comparator 11. The comparator 11 compares the selection value supplied from the selection value register 10with the countoutputfrom the counter9 and provides the output of comparison to the selector3.The selector3 divides display areas on the screen ofthe CRT display 5 based on the output of comparison from the comparator 11,so that a picture based on the still picture signal A read outfrom the frame memory 2 is displayed in one of the divided display areas and a picture based on the dynamic picture signal B entered through the inputterminal 12 is displayed in the other display area.
Now, in the following, the operation of a display device in accordance with an embodiment ofthe present invention will be described. The CPU 1 stores the selection value in the selection value register 10 and stores the first address oftheframe memory 2 in the offset register 6. The first address of the frame memory 2 stored in the offset register 6 is supplied to the adder7. The adder 7 aåds the read address supplied to the adder 7. The adder 7 adds the read address supplied from the controller4to the first address so as to designate successively addresses of the frame memory 2.
The controller 4 generates the horizontal synchro nizingsignal and supplies ittothecounter9.Tlne counter 9 counts the horizontal synchronizing signal and supplies the count outputto the comparator 11.
The comparator 11 compares the count value C of the counter 9 with the selection value D stored in the selection value register 10 and based on the output of comparison, the selector 3 is controlled so that a dynamic picture and a still picture are displayed respectively in the two different display areas on the screen ofthe CRT display 5.
More specifically, in case where the countvalue C of the counter 9 is smallerthanthe selection value D,the selection signal S from the comparator 11 is S=1.The selector3 selectsthe dynamic picture signal B entered from the inputterminal 12 based on the selection signal S=1 and supplies the dynamic picture signal B to the CRT display. As a result, in the upper display area on the screen ofthe CRTdisplay 5, a dynamic picture based on the dynamic picture signal B is displayed. When the counter 9 countsthe horizontal synchronizing signal and the countvalue C ofthe counter9 becomes largethantheselectionvalueD, the selection signal from the comparator 11 is S=0.
Then, based on the selection signal S=0, the selector3 selects the still picture signal A read out from the frame memory 2 so that a still picture based on the still picture signal A is displayed in the lower display area on the screen of the CRT display 5. Thus, a dynamic picture and a still picture are displayed simultaneously in the respective display areas divided horizontally on the screen of the CRT display 5.
The horizontal synchronizing signal counted by the counter9 can be separated in synchronism directly from the video signal entered from the exterior throughtheinputtermina112.
Although in the above described embodiment, the screen of the CRT display 5 is divided into two display areas with a comparator 11 and a selection value register 10 being provided, a plurality of comparators 11 and selection value registers 10 may be provided and in this case, by applying the count value of the horizontal synchronizing signal to the respective comparators 11 and storing different selection values in the selection value registers 10, different pictures can be displayed in a plurality of display areas divided on the screen ofthe CRTdisplay 5.
In addition, although in the above described embodiment, the selector 3 selects the dynamic picture signal B with the relation between the count value C ofthe counter9 and the selection valueD of the selection value register 10 being C < D and selects the still picture signal Awith the relatio being C > D,the selector may select on the contrary, the dynamic picture signal B with the relation of C > D and the still picture signal Awith the relation of C < D.
Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken byway of limitation, the spirit and scope of the present invention being limited only bythetermsoftheappended claims.

Claims (8)

1. Adisplaydevicefordisplaying pictures on a CRTdisplay, comprising: an input terminal (12) for receiving a video signal applied from the exterior, a frame memory (2)for storing picture data to be displayed, counting means (9) for counting a synchronizisng signal, setting meansforsefling in advance a value representing a horizontal border line ofthe display areas divided on the screen of said CRT display, so that pictures may be displayed in the respective display areas.
comparing means (11) for comparing the count value of said counting means and the value set by said setting means, and selecting means (3) responsive to the output signal of comparison of said comparing means for dividing along the horizontal border line, the display areas of the screen of said CRT display and selecting and displaying in the respective divided display areas, a picture based on thevideo signal received by said inputterminal and a picture based on the picture data read outfrom said frame memory.
2. A display device in accordance with claim 1, wherein said frame memory includes a storing area for storing the picture data of a still picture, the video signal received by said input terminal includes a signal for displaying a dynamic picture, and said selecting means includes meansfordisplaying selectively said dynamic picture and said still picture on said CRT display based on the output ofcompari- son of said comparing means.
3. A display device for displaying pictures on a display, the device having means to provide a first picture signal to the display, means to provide a second picture signal to the display synchronised with the first, selector means to select which picture signal is supplied to the display, and control means for controlling the operation of the selector means.
the control means having means in which a split-screen boundary value may be set, means to provide a position value representative ofthe position on the display at which the portion of the picture signal currently supplied to the display is displayed, and control output means which provides a control signal to the selector means in responsetoa comparison between the said split-screen boundaryvalue and the said position value, whereby the said split-screen boundary value represents a boundary on the display on one side of which the picture displayed is in accordance with the first picture signal and on the other side ofwhich the picture displayed is in accordance with the second picture signal.
4. A display device according to claim 3 in which the said split-screen boundaryvalue represents a horizontal boundary on the display and the position value providing means comprises a counterwhich countssynchronising signals.
5. A display device according to claim 4 in which the said first picture signal is provided by reading from a memory, and in which the control means comprises a controllerwhich provides address signals which are used in reading the first picture signal from the memory and provides the said synchronising signals to the counter.
6. Adisplay device according to claim 4 or claim 5 in which the said synchronising signals are horizontal synchronizing signals obtained from the said second picture signal.
7. A display device according to any one of claims 3to 6 in which the selector means can select between more than two picture signals and more than one split-screen boundary value can be set in the control means.
8. A display device substantially as herein described with reference to Figure 2 of the accompanying drawings.
GB08525338A 1984-10-15 1985-10-15 Split-screen display arrangement Expired GB2165719B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59215654A JPS6194479A (en) 1984-10-15 1984-10-15 Display device

Publications (3)

Publication Number Publication Date
GB8525338D0 GB8525338D0 (en) 1985-11-20
GB2165719A true GB2165719A (en) 1986-04-16
GB2165719B GB2165719B (en) 1988-02-10

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ID=16675971

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08525338A Expired GB2165719B (en) 1984-10-15 1985-10-15 Split-screen display arrangement

Country Status (4)

Country Link
JP (1) JPS6194479A (en)
CA (1) CA1329650C (en)
FR (1) FR2571882B1 (en)
GB (1) GB2165719B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217144A (en) * 1988-03-28 1989-10-18 Toshiba Kk Superimposlng a teletext picture on a television picture
EP0339675A2 (en) * 1988-04-28 1989-11-02 Matsushita Electric Industrial Co., Ltd. Television receiver and method of displaying video information
GB2222051A (en) * 1988-08-19 1990-02-21 Toshiba Kk Teletext page and image signal displayed simultaneously side-by-side
GB2235845A (en) * 1989-06-27 1991-03-13 Samsung Electronics Co Ltd A circuit for generating a scroll window signal in digital image apparatus
EP0497235A2 (en) * 1991-01-31 1992-08-05 EDICO S.r.l. Improved teletext transmission receiver
GB2253114A (en) * 1991-01-08 1992-08-26 Samsung Electronics Co Ltd Displaying at least two images on a divided screen
EP0766463A2 (en) * 1995-09-27 1997-04-02 Kabushiki Kaisha Toshiba Television receiver with superimposition of text and/or graphic patterns on the television picture
EP0766470A2 (en) * 1995-09-29 1997-04-02 Matsushita Electric Industrial Co., Ltd. Television receiver for teletext

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07203328A (en) * 1993-12-28 1995-08-04 Nec Corp Display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758712A (en) * 1972-03-27 1973-09-11 Sarkes Tarzian Digital special effects generator
GB2023962A (en) * 1978-05-12 1980-01-03 Nippon Electric Co Special effect television scene change device
GB1585952A (en) * 1977-05-24 1981-03-11 Sony Corp Soft-edged video special effects generator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2517916B1 (en) * 1981-12-04 1986-01-17 Thomson Csf STEREOSCOPIC VISUALIZATION APPARATUS FOR USE WITH A HELMET VIEWFINDER

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758712A (en) * 1972-03-27 1973-09-11 Sarkes Tarzian Digital special effects generator
GB1585952A (en) * 1977-05-24 1981-03-11 Sony Corp Soft-edged video special effects generator
GB2023962A (en) * 1978-05-12 1980-01-03 Nippon Electric Co Special effect television scene change device

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217144A (en) * 1988-03-28 1989-10-18 Toshiba Kk Superimposlng a teletext picture on a television picture
US5109279A (en) * 1988-03-28 1992-04-28 Kabushiki Kaisha Toshiba Television receiver with teletext receiving function and a method for superimposing a teletext picture on a television picture
GB2217144B (en) * 1988-03-28 1992-11-18 Toshiba Kk A television receiver with teletext receiving function and a method for superimposing a teletext picture on a television picture
EP0339675A2 (en) * 1988-04-28 1989-11-02 Matsushita Electric Industrial Co., Ltd. Television receiver and method of displaying video information
EP0339675A3 (en) * 1988-04-28 1990-02-28 Matsushita Electric Industrial Co., Ltd. Television receiver and method of displaying video information
US4991012A (en) * 1988-04-28 1991-02-05 Matsushita Electric Industrial Co., Ltd. Television receiver displaying multiplex video information on a vertically oblong display screen and an information displaying method thereof
GB2222051B (en) * 1988-08-19 1992-11-11 Toshiba Kk Color television set having a teletext receiver built-in
GB2222051A (en) * 1988-08-19 1990-02-21 Toshiba Kk Teletext page and image signal displayed simultaneously side-by-side
GB2235845A (en) * 1989-06-27 1991-03-13 Samsung Electronics Co Ltd A circuit for generating a scroll window signal in digital image apparatus
GB2235845B (en) * 1989-06-27 1993-12-22 Samsung Electronics Co Ltd A circuit for generating a scroll window signal in digital image apparatus
GB2253114A (en) * 1991-01-08 1992-08-26 Samsung Electronics Co Ltd Displaying at least two images on a divided screen
GB2253114B (en) * 1991-01-08 1995-05-24 Samsung Electronics Co Ltd Displaying at least two images on a divided screen
EP0497235A2 (en) * 1991-01-31 1992-08-05 EDICO S.r.l. Improved teletext transmission receiver
EP0497235A3 (en) * 1991-01-31 1993-03-17 Edico S.R.L. Improved teletext transmission receiver
EP0766463A2 (en) * 1995-09-27 1997-04-02 Kabushiki Kaisha Toshiba Television receiver with superimposition of text and/or graphic patterns on the television picture
EP0766463A3 (en) * 1995-09-27 1997-08-13 Toshiba Kk Television receiver with superimposition of text and/or graphic patterns on the television picture
US5734436A (en) * 1995-09-27 1998-03-31 Kabushiki Kaisha Toshiba Television receiving set having text displaying feature
EP0766470A2 (en) * 1995-09-29 1997-04-02 Matsushita Electric Industrial Co., Ltd. Television receiver for teletext
EP0766470A3 (en) * 1995-09-29 1998-11-11 Matsushita Electric Industrial Co., Ltd. Television receiver for teletext
US6532041B1 (en) 1995-09-29 2003-03-11 Matsushita Electric Industrial Co., Ltd. Television receiver for teletext

Also Published As

Publication number Publication date
FR2571882B1 (en) 1990-11-02
GB8525338D0 (en) 1985-11-20
FR2571882A1 (en) 1986-04-18
GB2165719B (en) 1988-02-10
JPS6194479A (en) 1986-05-13
CA1329650C (en) 1994-05-17

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931015