CN102279723A - System and method for realizing split-screen display - Google Patents

System and method for realizing split-screen display Download PDF

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Publication number
CN102279723A
CN102279723A CN2011102439077A CN201110243907A CN102279723A CN 102279723 A CN102279723 A CN 102279723A CN 2011102439077 A CN2011102439077 A CN 2011102439077A CN 201110243907 A CN201110243907 A CN 201110243907A CN 102279723 A CN102279723 A CN 102279723A
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China
Prior art keywords
video memory
app
display
display driver
memory zone
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CN2011102439077A
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Chinese (zh)
Inventor
李新征
谢美伦
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Beijing Baidu Netcom Science and Technology Co Ltd
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Beijing Baidu Netcom Science and Technology Co Ltd
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Priority to CN2011102439077A priority Critical patent/CN102279723A/en
Publication of CN102279723A publication Critical patent/CN102279723A/en
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Abstract

The invention provides a system and a method for realizing split-screen display. A display screen is logically divided into N display areas. The system comprises a display controller, a display memory and N display drivers, wherein the display memory comprises N display memory areas; each display driver corresponds to one of the display memory areas; each display memory area corresponds to one of the display areas; N is an integer which is more than 2; when the display drivers are called by an upper application program (APP), the data of the APP is acquired and written into or updated to the corresponding display memory areas; the display memory areas buffer the data to be displayed in the corresponding display areas; and the display controller reads the data of each display memory area and transmits the data to the display area which corresponds to each display memory area. The invention has the advantages that: the split-screen display is realized on the same display screen without customizing the display screen; and the independence of each display area is guaranteed.

Description

A kind of system and method for realizing that split screen shows
[technical field]
The present invention relates to field of computer technology, particularly a kind of system and method for realizing that split screen shows.
[background technology]
For a long time, embedded device can only be as a screen display because its display resolution is lower, screen size is little, is monopolized by system as a display device.Along with evolution of embedded technology, the display resolution of embedded device is more and more higher, screen size is increasing, realize that on screen the demand that split screen shows gets more and more, hope can be divided into a plurality of viewing areas with a display screen, use to operating system part viewing area, and a part of viewing area is used for contents such as display ads, dummy keyboard or information.
The existing method that realizes that split screen shows mainly comprises following two kinds:
One, from hardware, display screen is divided into a plurality of screens, controls these respectively by software then and shield the function that realizes that split screen shows.This method need customize display screen, and it is higher to lack versatility and cost.
Two, display screen is divided into several viewing areas, shows different content respectively from application layer.But owing to be the differentiation of display screen being carried out from application layer, therefore a plurality of screens only can show the different content of same current application, can't guarantee the independence of each viewing area.
[summary of the invention]
In view of this, the invention provides a kind of method and system of realizing that split screen shows, realize that on same display screen split screen shows, need not display screen is customized, and guarantees the independence of each viewing area.
Concrete technical scheme is as follows:
A kind of system that realizes that split screen shows, display screen is from being divided into N viewing area in logic, described system comprises: display controller, a video memory and N display driver, wherein said video memory comprises N video memory zone, the respectively corresponding video memory zone of each display driver, each respectively corresponding viewing area, video memory zone, described N is the integer more than 2;
Described display driver when being used for being called by upper level applications APP, obtaining the data of described APP and writes or be updated to corresponding video memory zone;
Described video memory zone is used for the data that buffer memory will be presented at corresponding viewing area;
Described display controller is used to read the data in each video memory zone and transfers to each video memory zone corresponding display.
Particularly, the size in described video memory zone is determined by the resolution and the color depth of corresponding viewing area.
Preferably, each storage unit in the described video memory zone respectively with corresponding viewing area in pixel corresponding one by one, the size in described video memory zone is that the resolution of corresponding viewing area multiply by the pairing byte number of color depth.
Wherein, a described N display driver provides different interfaces to keep supplying a layer APP respectively and calls, and perhaps provides unified interface to keep supplying a layer APP and calls.
Described N display driver calls for same APP; Perhaps
A described N display driver calls for different APP respectively; Perhaps,
A display driver calls for a plurality of APP.
Further, keep supplying between the interface that layer APP call at display driver and its and also comprise:
The composing unit is used for when this display driver calls for a plurality of APP the data from described a plurality of APP being carried out image co-registration, and described image co-registration comprises: image is synthetic, at least a in the configuration of figure layer and the transparency configuration.
A kind of method that realizes that split screen shows, display screen is from being divided into N viewing area in logic, and video memory comprises N video memory zone, N the video memory zone that display driver is corresponding different respectively, each respectively corresponding viewing area, video memory zone, described N is the integer more than 2; Described method comprises:
When described display driver is called by upper level applications APP, obtain the data of described APP and write or be updated to corresponding video memory zone;
Described video memory zone buffer memory will be presented at the data of corresponding viewing area;
Described display controller reads the data in each video memory zone and transfers to each video memory zone corresponding display.
Particularly, the size in described video memory zone is determined by the resolution and the color depth of corresponding viewing area.
Preferably, each storage unit in the described video memory zone respectively with corresponding viewing area in pixel corresponding one by one, the size in described video memory zone is that the resolution of corresponding viewing area multiply by the pairing byte number of color depth.
Wherein, described display driver is called by upper strata APP and comprises:
A described N display driver is called by upper strata APP by different interfaces, is perhaps called by upper strata APP by unified interface.
Particularly, described display driver is called by upper strata APP and comprises:
A described N display driver is called by same APP; Perhaps
A described N display driver is called by different APP respectively; Perhaps,
A display driver is called by a plurality of APP.
Further, when a display driver was called by a plurality of APP, this method also comprised:
The composing unit carries out image co-registration to the data from described a plurality of APP, and the data after the image co-registration are sent to a described display driver, and described image co-registration comprises: image is synthetic, at least a in the configuration of figure layer and the transparency configuration.
As can be seen from the above technical solutions, the present invention operates a plurality of video memorys zone by said system and method at bottom and is implemented in and carries out split screen on the physics screen and show by a plurality of display drivers, need not display screen is customized, be applicable to any display screen, have high generality and reduced the realization cost; Thereby this mode that shows at the bottom layer realization split screen can be called different display drivers simultaneously for different APP and show the content of different APP in the different viewing areas of display screen, thereby has guaranteed the independence of each viewing area.
[description of drawings]
A kind of system construction drawing of realizing that split screen shows that Fig. 1 provides for the embodiment of the invention;
Fig. 2 realizes the system construction drawing that split screen shows for the another kind that the embodiment of the invention provides;
Software architecture figure under the Android platform that Fig. 3 provides for the embodiment of the invention;
The method flow diagram that the realization split screen that Fig. 4 provides for the embodiment of the invention shows.
[embodiment]
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
The present invention from being divided into N viewing area in logic, and is divided into N video memory zone with the video memory correspondence with a display screen, each respectively corresponding viewing area, video memory zone, and buffer memory will be presented at the data of corresponding viewing area.Simultaneously, there be N display driver, the respectively corresponding video memory zone of each display driver, each display driver provides operation-interface to the upper strata, keep supplying a layer APP and call, when promptly display driver is called by APP, obtain the data of this APP and write or be updated to corresponding video memory zone.Above-mentioned N is the integer more than 2.
Display screen described in the embodiment of the invention is physics screen, can adopt but is not limited to: LED display, LCD display etc.When in advance display screen being divided into a plurality of viewing area, can adopt any-mode, a kind ofly preferred embodiment be: the longitudinal length along display screen is divided, and the width of each viewing area is the width of display screen.
For convenience of description and understand, all with two viewing areas, corresponding two video memorys zone and two display drivers are that example is described in the embodiment of the invention.
As shown in Figure 1, in video memory, there are two video memory zones, i.e. video memory zone 1 and video memory zone 2, viewing area 1 and the viewing area 2 on display screen of correspondence respectively.Viewing area 1 and viewing area 2 are to divide along the longitudinal length of display screen, and width is identical with the width of display screen, and wherein viewing area 1 is greater than the area of viewing area 2.Certainly, viewing area 1 shown in Fig. 1 and viewing area 2 only are a kind of example that the embodiment of the invention provided, and can also select other dividing mode, and be no longer exhaustive at this.
Video memory zone 1 and video memory zone 2 are respectively continuous application heap physically, and first address is respectively base1 and base2, and the size in video memory zone 1 and video memory zone 2 is determined by the resolution and the color depth of its corresponding display respectively.
If each storage unit in the video memory zone respectively with corresponding viewing area in pixel corresponding one by one, the size in video memory zone multiply by the pairing byte number of color depth for resolution so.
The resolution of supposing a physical screen is 640*360, color depth is 8bit (taking a byte), if it is 600*360 and two viewing areas of 40*360 that this screen is divided into resolution, the address in two video memory zones can be respectively in the video memory so: base is to base+600*360-1, and base+600*360 is to base+640*360.
The resolution of supposing a physical screen is 854*480, color depth is 16bit (taking two bytes), if being divided into this screen respectively, rate is 800*480 and two viewing areas of 54*480, the address in two video memory zones can be respectively in the video memory so: base is to base+800*480*2-1, and base+800*480*2 is to base+854*480*2.
In CPU, there are two display drivers: display driver 1 and display driver 2, be respectively applied for operation video memory zone 1 and video memory zone 2, and provide interface to upper layer application, keep supplying a layer APP and call.
Display driver 1 receives the data of the upper strata APP that calls display driver 1, and the data that receive are write or are updated to video memory zone 1, by display controller use direct internal memory read (DMA) read in the video memory zone 1 data and by being transferred to viewing area 1 such as RGB (RGB) interface or mobile industry processor interface image data interfaces such as (MIPI).Equally, display driver 2 receives the data of the upper strata APP that calls display driver 2, and the data that receive are write or are updated to video memory zone 2, by display controller use DMA read in the video memory zone 2 data and by being transferred to viewing area 2 such as image data interfaces such as rgb interface or MIPI interfaces.
Wherein, display driver 1 and display driver 2 can adopt unified interface to keep supplying a layer APP and call, and also can adopt different interfaces to keep supplying a layer APP and call.This keeps supplying the interface that layer APP call can be Graphics Device Interface (GDI).
The mode that different display drivers are called by APP can adopt following several:
First kind: display driver 1 and display driver 2 can call for same APP, for example can call for input method simultaneously, display driver 1 is used for the input results interface data of input method is write or be updated to video memory zone 1, and further is shown in viewing area 1; Display driver 2 is used for the inputting interface data of input method (for example dummy keyboard) are write or be updated to video memory zone 2, and further is shown in viewing area 2.
Second kind: display driver 1 also can call for different APP respectively with display driver 2, and as shown in fig. 1, display driver 1 can call for APP1, and display driver 2 can call for APP2.For example display driver 1 can call for browser, the interface data of browser is write or is updated to video memory zone 1, and further be shown in viewing area 1; Display driver 2 can call for the advertisement pushing device, ad data is write or is updated to video memory zone 2, and further is shown in viewing area 2.
The third: a display driver can call for a plurality of APP simultaneously, and as shown in Figure 2, display driver 1 can call for APP1 and APP2, and display driver 2 can call for APP3.At this moment, keep supplying between the interface that layer APP call at display driver and its and also can have a composing unit (Composer), be used for the data from a plurality of APP are carried out image co-registration, include but not limited to: image is synthetic, the configuration of figure layer, transparency configuration etc.
When carrying out image co-registration, the strategy of employing can for: the sequencing that is called by the user according to a plurality of APP carries out the configuration of figure layer, transparency configuration etc. for the data of each APP.For example the data configuration of the up-to-date APP that calls of user is figure layer topmost, transparency is minimum, i.e. the figure layer of the data configuration of the new more APP that calls upper end more, and transparency is low more.
Method of calling shown in above-mentioned second kind and the third can be widely used in the advertisement pushing field, viewing area 1 corresponding video memory zone 1 and display driver 1 that for example can area is bigger, this display driver 1 of each application call of operating system, viewing area 2 corresponding video memory zone 2 and the display drivers 2 that area is less, the APP that pushes advertisement calls this display driver 2.Finally, be implemented in each application of display operation system in the bigger viewing area 1, the propelling movement of 2 realization advertising messages in less viewing area.Like this, ad content can not covered or block by other application programs, thereby can be presented at the purpose that viewing area 2 reaches advertisement marketing always, and, ad content can not impact other application of mobile phone, and the user is every function of 1 use mobile phone in the viewing area normally.
Be example with Android (android) platform below, the software architecture figure that above-mentioned technology realizes is described, as shown in Figure 3, in Linux kernel, there are two video memory zone fb0 and fb1, hardware abstraction layer can be respectively applied for the fb0 and the fb1 of operation bottom by hal0 and hal1, hardware abstraction layer is actual to be exactly driver, has defined the demand of system to each hardware.Hal0 and hal1 provide unified operation-interface by viewing hardware (Displayhardware) to upper strata surfaceflinger, and surfaceflinger carries out image co-registration to the data of each APP.Realize the GDI interface at the java layer, keep supplying a layer APP and call.View1, View2 ..., the various APPs of Viewn in the android system, moving.
Based on the system that above-mentioned realization split screen shows, realize that the method flow that split screen shows can may further comprise the steps as shown in Figure 4:
Step 401: when display driver is called by upper strata APP, obtain from the data of APP and write or be updated to corresponding video memory zone.
Described in above-mentioned system, display driver is when being called by upper strata APP, and N display driver can be called by upper strata APP by different interfaces, also can be called by upper strata APP by unified interface.
When specifically calling display driver, the mode that N display driver called by APP can adopt following several:
First kind: a plurality of display drivers can call for same APP, for example can call for input method simultaneously, and display driver 1 is used for the input results interface data of input method is write or be updated to video memory zone 1, and further is shown in viewing area 1; Display driver 2 is used for the inputting interface data of input method (for example dummy keyboard) are write or be updated to video memory zone 2, and further is shown in viewing area 2.
Second kind: a plurality of display drivers can call for different APP respectively, and as shown in fig. 1, display driver 1 can call for APP1, and display driver 2 can call for APP2.For example display driver 1 can call for browser, the interface data of browser is write or is updated to video memory zone 1, and further be shown in viewing area 1; Display driver 2 can call for the advertisement pushing device, ad data is write or is updated to video memory zone 2, and further is shown in viewing area 2.
The third: a display driver can call for a plurality of APP simultaneously, and as shown in Figure 2, display driver 1 can call for APP1 and APP2, and display driver 2 can call for APP3.
When a display driver is called by a plurality of APP, also comprise a composing unit between the interface that this display unit and this display unit are called by APP, also comprised before this step: the composing unit carries out image co-registration to the data from a plurality of APP, data after the image co-registration are sent to the step of this display driver, wherein image co-registration can comprise that image is synthetic, at least a in the configuration of figure layer and the transparency configuration.
Step 402: video memory zone buffer memory will be presented at the data of corresponding viewing area.
Each video memory zone is respectively continuous application heap physically, and its size is determined by the resolution and the color depth of its corresponding display respectively.Preferred embodiment a kind of: each storage unit in the video memory zone respectively with corresponding viewing area in pixel corresponding one by one, at this moment, the size in video memory zone multiply by the pairing byte number of color depth for resolution.
Step 403: display controller reads the data in each video memory zone and transfers to each video memory zone corresponding display.
Display controller uses DMA reading of data from each video memory zone of video memory, and by such as image data interfaces such as RGB or MIPI with the data transmission that reads in each video memory zone to corresponding display.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (12)

1. system that realizes that split screen shows, it is characterized in that, display screen is from being divided into N viewing area in logic, described system comprises: display controller, a video memory and N display driver, wherein said video memory comprises N video memory zone, the respectively corresponding video memory zone of each display driver, each respectively corresponding viewing area, video memory zone, described N is the integer more than 2;
Described display driver when being used for being called by upper level applications APP, obtaining the data of described APP and writes or be updated to corresponding video memory zone;
Described video memory zone is used for the data that buffer memory will be presented at corresponding viewing area;
Described display controller is used to read the data in each video memory zone and transfers to each video memory zone corresponding display.
2. system according to claim 1 is characterized in that, the size in described video memory zone is determined by the resolution and the color depth of corresponding viewing area.
3. system according to claim 2, it is characterized in that, each storage unit in the described video memory zone respectively with corresponding viewing area in pixel corresponding one by one, the size in described video memory zone is that the resolution of corresponding viewing area multiply by the pairing byte number of color depth.
4. according to claim 1,2 or 3 described systems, it is characterized in that a described N display driver provides different interfaces to keep supplying a layer APP respectively and calls, perhaps provide unified interface to keep supplying a layer APP and call.
5. according to claim 1,2 or 3 described systems, it is characterized in that described N display driver calls for same APP; Perhaps
A described N display driver calls for different APP respectively; Perhaps,
A display driver calls for a plurality of APP.
6. system according to claim 5 is characterized in that, keeps supplying between the interface that layer APP call at display driver and its also to comprise:
The composing unit is used for when this display driver calls for a plurality of APP the data from described a plurality of APP being carried out image co-registration, and described image co-registration comprises: image is synthetic, at least a in the configuration of figure layer and the transparency configuration.
7. a method that realizes that split screen shows is characterized in that display screen is from being divided into N viewing area in logic, video memory comprises N video memory zone, N the video memory zone that display driver is corresponding different respectively, each respectively corresponding viewing area, video memory zone, described N is the integer more than 2; Described method comprises:
When described display driver is called by upper level applications APP, obtain the data of described APP and write or be updated to corresponding video memory zone;
Described video memory zone buffer memory will be presented at the data of corresponding viewing area;
Described display controller reads the data in each video memory zone and transfers to each video memory zone corresponding display.
8. method according to claim 7 is characterized in that, the size in described video memory zone is determined by the resolution and the color depth of corresponding viewing area.
9. method according to claim 8, it is characterized in that, each storage unit in the described video memory zone respectively with corresponding viewing area in pixel corresponding one by one, the size in described video memory zone is that the resolution of corresponding viewing area multiply by the pairing byte number of color depth.
10. according to claim 7,8 or 9 described methods, it is characterized in that described display driver is called by upper strata APP and comprises:
A described N display driver is called by upper strata APP by different interfaces, is perhaps called by upper strata APP by unified interface.
11., it is characterized in that described display driver is called by upper strata APP and comprises according to claim 7,8 or 9 described methods:
A described N display driver is called by same APP; Perhaps
A described N display driver is called by different APP respectively; Perhaps,
A display driver is called by a plurality of APP.
12. method according to claim 11 is characterized in that, when a display driver was called by a plurality of APP, this method also comprised:
The composing unit carries out image co-registration to the data from described a plurality of APP, and the data after the image co-registration are sent to a described display driver, and described image co-registration comprises: image is synthetic, at least a in the configuration of figure layer and the transparency configuration.
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