CN106686332A - Video display control method and EDID management method - Google Patents
Video display control method and EDID management method Download PDFInfo
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- CN106686332A CN106686332A CN201611013314.0A CN201611013314A CN106686332A CN 106686332 A CN106686332 A CN 106686332A CN 201611013314 A CN201611013314 A CN 201611013314A CN 106686332 A CN106686332 A CN 106686332A
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- video
- edid
- input interface
- temporal specification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Graphics (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The present invention provides a video display control method and a corresponding EDID management method. The EDID management method includes the following steps that: detailed timing description (DTD) about video resolution in the EDID of a video input interface is updated, so that updated detailed timing description can be obtained; and a hot-plug signal is operated, so that a low pulse can be generated to notify a front end device connected with the video input interface to read the updated detailed timing description through the bus channel of the video input interface, so that the front end device can determine display timing for subsequent video signal output based on the updated detailed timing description. According to the method, the DTD can be updated manually or automatically. According to the video display control method and the corresponding EDID management method of the invention, input resolution is modified, so that point-to-point display can be realized, and therefore, problems such as the problems of incomplete display and black frame lingering of the display of video signals on a back-end device can be solved, and the visual experience effect of a user can be improved.
Description
Technical field
The present invention relates to display control technology field, more particularly to a kind of video display control method and a kind of EDID pipes
Reason method.
Background technology
EDID (Extended Display Identification Data, extending display identification data) typically by
128 bytes constitute (having expanded to 256 bytes), wherein believing comprising the parameter about display and its performance, including supplier
Breath, maximum image size, color are arranged, factory default is put, the character of the restriction of frequency range and display name and serial number
String etc..EDID occurs in order to be able to allow PC or other image output devices preferably to recognize video attribute.
The general display process of video signal is illustrated in figure 1, premenstrual end equipment PC of video signal is input into Video processing
On device, through a series of transmission or switching, video processor is sent to video signal on rear end display/scialyscope.
Input, video processor need to allow headend equipment PC know video processor can incoming video signal, and tell
The display sequential that PC video processors are supported, otherwise PC may refuse to export any video signal；In outfan, at video
When reason device needs self-built output timing rather than simple duplication input timing, it is necessary to know rear end display/scialyscope
The display sequential held, so as to the signal for allowing video processor to export can normally show on rear end display/scialyscope.If depending on
The output resolution ratio of frequency processor is mismatched with rear end display/scialyscope resolution, just occurs that video signal is aobvious in rear end
Show the display on device/scialyscope not exclusively or leave the phenomenons such as black surround.
However, the EDID contents of the video interface of video processor are fixed in prior art, EDID is not carried out
Management, its output resolution ratio for being easily caused video processor is mismatched with rear end equipment resolution, realizes point-to-point display
The operation of complex operation and impact user and visual experience effect.
The content of the invention
Therefore, the present invention proposes a kind of video display control method and one for defect of the prior art and deficiency
Plant EDID management methods.
Specifically, a kind of video display control method that the embodiment of the present invention is proposed, is applied to video processor.It is described to regard
Frequency display control method includes step：With regard to video point in the EDID of the video input interface of (i) renewal video processor
The detailed temporal specification of resolution, with detailed temporal specification after being updated；(ii) microcontroller in the video processor enters
Enter to interrupt and inform that the video for connecting the video processor is defeated by operating hot plug signal to produce a trigger pulse
The headend equipment of incoming interface reads detailed temporal specification after the renewal by the bus run of the video input interface；
(iii) headend equipment is received according in detail the video of the display sequential export that temporal specification determines is believed based on after the renewal
Number；And the rear end equipment that (iv) carries out exporting after image procossing to the video processor to the video signal for receiving.
In one embodiment of the invention, step (i) is specifically included：The video input interface that user is changed
Detailed temporal specification in EDID with regard to video resolution is detailed after storing into nonvolatile memory to obtain the renewal
Temporal specification.
In another embodiment of the present invention, step (i) is specifically included：By the video frequency output of the video processor
The bus run of interface reads the 2nd EDID of the video input interface of the rear end equipment；And from the detailed of the 2nd EDID
Best video resolution is extracted in thin temporal specification and write the described of the video input interface of the video processor
In EDID with regard in the detailed temporal specification of video resolution to obtain the renewal after detailed temporal specification.
In one embodiment of the invention, the video input interface be USB interface, HDMI, DVI interface or
DisplayPort interfaces.
In one embodiment of the invention, the trigger pulse is low pulse.
In one embodiment of the invention, the rear end equipment includes LED display.
Additionally, a kind of EDID management methods that the embodiment of the present invention is proposed, it is adaptable to video processor.The EDID management
Method includes step：With regard to the detailed temporal specification of video resolution in the EDID of (a) renewal video input interface, to obtain more
Detailed temporal specification after new；And (b) operation hot plug signal produces a low pulse and informs the connection video input interface
Headend equipment temporal specification in detail is read after the renewal by the bus run of the video input interface, before described
End equipment is based on the display sequential adopted when in detail temporal specification determines follow-up output video signal after the renewal.
In one embodiment of the invention, step (a) is specifically included：The video input interface that user is changed
Detailed temporal specification in EDID with regard to video resolution is detailed after storing into nonvolatile memory to obtain the renewal
Temporal specification.
In another embodiment of the present invention, step (a) is specifically included：Read by the bus run of video output interface
Take the EDID of the rear end equipment for connecting the video output interface；And the detailed sequential of the EDID from the rear end equipment
Best video resolution is extracted in description and is write in the EDID of the video input interface with regard to the detailed of video resolution
Detailed temporal specification after carefully in temporal specification to obtain the renewal.
In one embodiment of the invention, the video input interface be USB interface, HDMI, DVI interface or
DisplayPort interfaces.
From the foregoing, it will be observed that the embodiment of the present invention can reach following one or more beneficial effects：(1) video processor is defeated
Enter resolution manually can be configured with automatic two kinds of way to manages；(2) under automated manner, video processor can be with
Extract the best video resolution of rear end equipment video input interface to show video signal, it is only necessary to by changing defeated automatically
Enter the mode of resolution, you can reach point-to-point display, simplify operating procedure；And (3) improve the visual experience of user
Effect.
Become obvious by the other side and feature below with reference to the detailed description of accompanying drawing, the present invention.But should know
Road, the accompanying drawing is only the purpose design explained, not as the restriction of the scope of the present invention.It should also be noted that unless another
Point out outward, it is not necessary to scale accompanying drawing, they only try hard to conceptually illustrate structure described herein and flow process.
Description of the drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 1 is the general display process schematic of video signal.
Fig. 2 is a kind of application scenarios schematic diagram of EDID management methods.
Fig. 3 is schematic flow sheet when EDID updates in application scenarios shown in Fig. 2.
Fig. 4 is the configuration information interface sectional drawing in the detailed temporal specification of EDID.
Fig. 5 is the corresponding relation figure of the major parameter in the detailed temporal specification of EDID.
Specific embodiment
It is understandable to enable the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
Technical scheme in the following embodiments of the present invention proposes a kind of EDID management methods of video processor, using this skill
Art scheme manually can arrange video input resolution with automatic two ways, solve the output resolution ratio of video processor
Display of the video signal for mismatching with rear end equipment display resolution and causing in rear end equipment is incomplete or leaves black
The problems such as frame, so as to improve the visual experience effect of user.
Fig. 2 is a kind of application scenarios schematic diagram of EDID management methods.The headend equipment such as PC or DVD 21 believes video
(HDMI/DVI interface internals have EDID information, for example, be stored in interface internal for number Jing HDMI/DVI video input interfaces
In EEPROM (or other nonvolatile memories such as Flash), the resolution needed for for supporting headend equipment 21) it is sent to
On video processor 23, through a series of transmission and process, will by the Jing HDMI/DVI video output interfaces of video processor 23
The video signal handled well sends to the rear end equipment 25 such as display (such as LED display) or projector and is shown.
Typically, HDMI/DVI interfaces are configured with DDC (Display Data Channel, DDC) bus run, hot-
(Transition Minimized Differential Signaling are minimized for plug (hot plug) signalling channels and TMDS
Differential signal transmission) channel video signal.
Fig. 3 is schematic flow sheet when EDID updates in application scenarios shown in Fig. 2.The video processor of the present embodiment
EDID management methods, are according to VESA (Video Electronics Standards Association, video electronics standard
Association) standard data form configuration information, it is allowed to using optimal display output effect.The present embodiment has automated manner and handss
Two kinds of EDID generation patterns of flowing mode are available.In the present embodiment, EDID is stored in the video input of video processor 23 and connects
In the nonvolatile memories such as the EEPROM of mouth, and the read-write operation of EDID is controlled by microcontroller such as MCU.
Under manual mode, user need not be concerned about the video resolution of rear end equipment 25 detailed temporal specification (DTD,
Detailed Timing Descriptions), it is only necessary to change in the input interface EDID of video processor 23 with regard to video
The detailed temporal specification of resolution, after modification is completed, the microcontroller of video processor 23 can be entered and interrupted and by operation
Hot-plug signals produce a low pulse, then notify that headend equipment 21 reads video processor 23 and supports by DDC buses
The video resolution being stored in the nonvolatile memories such as input interface EEPROM detailed temporal specification, allow headend equipment
21 video input interfaces for showing sequential to video processor 23 accordingly according to the demand output of user, afterwards again by video
The output resolution ratio size of the video processor 23 that reason device 23 sets according to user, using built-in image processing module for example
Scalar modules carry out image procossing to the video signal being input into, to reach the purpose for showing completely.Scalar modules herein
The image processing operations such as image scaling, image segmentation/intercepting can for example be carried out.
Under automated manner, the active of video processor 23 reads rear end equipment 25 by the DDC buses of output video interface
Video input interface is stored in the EDID in the nonvolatile memories such as EEPROM, and the detailed temporal specification from EDID
Extract best video resolution and be written in the detailed temporal specification of the input interface EDID of video processor 23, then
The microcontroller of video processor 23 can be entered and interrupted, and produce a low pulse by operating hot-plug signals so that front end
Equipment 21 reads the detailed of the EDID that video processor 23 is stored in the nonvolatile memories such as video input interface EEPROM
Temporal specification, reaching can be with the purpose of automatic identification.
It is noted that for correspondence HDMI/DVI interfaces, when hot-plug signals are low level, representing equipment not
Insertion；When hot-plug signals are high level, the connection of equipment is indicated.Therefore, video processor 23 has been updated every time
Video resolution in input interface EDID, actively produce a low pulse (this low pulse standard should more than 500ms,
800ms is greater than in practical application), when headend equipment 21 detects hot-plug signals when low level is changed into high level, just
Actively read an input interface EDID.
Video input interface EDID in the present embodiment is the information of a 256byte, and EDID provides nearly all aobvious
Show the universal description of parameter.The first eight byte is header, is made up of 00FFFFFFFFFFFF00, is immobilized；And most concerned about
The information detailed temporal specification (DTD) that to be initial address amount to 72 bytes for hexadecimal 36h, 48h, 5Ah and 6Ch, it is front
End equipment 21 is exactly based on the detailed temporal specification information of identification, and the optimum resolution supported according to video processor 23 is aobvious to export
Show sequential.This 72 bytes are divided into four parts, per the byte of part 18, at most four sequential (Timing) can be carried out
Describe in detail；And typically Part I (namely initial address for 36h 18 bytes) must be sequential describe in detail with
The optimal sequential of description display, it can also be display descriptor (Monitor that other three parts can be sequential detailed description
Descriptor)。
Hold above-mentioned, the configuration information of detailed temporal specification is as shown in Figure 4 in EDID.Specifically, Fig. 4 illustrates aforementioned first
The detailed temporal specification for dividing, which depict the major parameter for showing sequential, and concrete meaning see the table below 1.
Table 1：Major parameter list in detail in temporal specification
Fig. 5 is the corresponding relation figure of parameters in table 1, as shown in Figure 5, blanking interval=forward position+synchronization+tailing edge, this four
Wherein three can just extrapolate another known to individual parameter.Furthermore, the rightmost Sync Scheme fields of Fig. 4 are described together
The information of step signal, wherein top four is the method for synchronization, is typically chosen " Digital Separate " (digital separation)；Below
Two be synchronizing signal polarity, select to represent polarity for just, i.e., it is high effectively, do not select to represent polarity be it is negative, i.e., it is low effective.This
Outward, what deserves to be explained is, the digital visual interface such as EDID and HDMI, DVI, DisplayPort of the analog video interface such as VGA
The maximum difference of EDID is exactly video input description, and the input of USB interface is Analog, and the EDID of HDMI/DVI interfaces, choosing
Select Digital inputs.
In sum, present invention can reach following one or more beneficial effects：(1) video processor
Input resolution manually can be configured with automatic two kinds of way to manages；(2) under automated manner, video processor
The best video resolution of rear end equipment video input interface can be extracted to show video signal, it is only necessary to by repairing automatically
Change the mode of input resolution, you can reach point-to-point display, simplify operating procedure；And (3) improve the vision of user
Experience effect.
Finally it is worth mentioning that, the video processor of present invention for example include video frequency processing chip (as
STDP8028 family chips etc.), video input interface, video output interface and electrically connect the video frequency processing chip, described regard
The microcontroller of frequency input interface and the video output interface such as MCU；Transmission card logic can also be even integrated with (to be used for
There is provided sending card function).Wherein, the video input interface typically comprises interface circuit and for storing the non-volatile of EDID
Property memorizer.Additionally, if aforementioned rear end equipment includes LED display, the EDID of rear end equipment is for example stored in sending
On card.
The above, is only presently preferred embodiments of the present invention, and any pro forma restriction is not made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, in the range of without departing from technical solution of the present invention, when making a little change or modification using the technology contents of the disclosure above
For the Equivalent embodiments of equivalent variations, as long as being without departing from technical solution of the present invention content, according to the technical spirit pair of the present invention
Any simple modification, equivalent variations and modification that above example is made, still fall within the range of technical solution of the present invention.
Claims (10)
1. a kind of video display control method, is applied to video processor；Characterized in that, the video display control method bag
Include step：
With regard to the detailed temporal specification of video resolution in the EDID of the video input interface of (i) renewal video processor,
With detailed temporal specification after being updated；
(ii) microcontroller in the video processor enters and interrupts and produce a triggering arteries and veins by operating hot plug signal
Punching informs the headend equipment of the video input interface for connecting the video processor by the total of the video input interface
Line passage reads detailed temporal specification after the renewal；
(iii) headend equipment is received according to regarding based on the display sequential export that in detail temporal specification determines after the renewal
Frequency signal；And
(iv) video signal to receiving carries out the rear end equipment exported after image procossing to the video processor.
2. video display control method as claimed in claim 1, it is characterised in that step (i) is specifically included：User is changed
The video input interface EDID in store into nonvolatile memory with regard to the detailed temporal specification of video resolution
Detailed temporal specification after to obtain the renewal.
3. video display control method as claimed in claim 1, it is characterised in that step (i) is specifically included：
The video input interface of the rear end equipment is read by the bus run of the video output interface of the video processor
The 2nd EDID；
Best video resolution is extracted from the detailed temporal specification of the 2nd EDID and write the institute of the video processor
State in the EDID of video input interface with regard in the detailed temporal specification of video resolution to obtain the renewal after in detail
Temporal specification.
4. video display control method as claimed in claim 1, it is characterised in that the video input interface be USB interface,
HDMI, DVI interface or DisplayPort interfaces.
5. video display control method as claimed in claim 1, it is characterised in that the trigger pulse is low pulse.
6. video display control method as claimed in claim 1, it is characterised in that the rear end equipment includes LED display.
7. a kind of EDID management methods, it is adaptable to video processor；Characterized in that, the EDID management methods include step：
With regard to the detailed temporal specification of video resolution in the EDID of (a) renewal video input interface, with detailed after being updated
Temporal specification；And
B () operation hot plug signal produces a low pulse and informs the headend equipment for connecting the video input interface by described
The bus run of video input interface reads detailed temporal specification after the renewal, so that the headend equipment is based on the renewal
Afterwards detailed temporal specification determines the display sequential adopted during follow-up output video signal.
8. EDID management methods as claimed in claim 7, it is characterised in that step (a) is specifically included：The institute that user is changed
State the detailed temporal specification in the EDID of video input interface with regard to video resolution to store into nonvolatile memory to obtain
The detailed temporal specification to after the renewal.
9. EDID management methods as claimed in claim 7, it is characterised in that step (a) is specifically included：
The EDID of the rear end equipment of the connection video output interface is read by the bus run of video output interface；
Best video resolution is extracted from the detailed temporal specification of the EDID of the rear end equipment and the video is write
In the EDID of input interface with regard in the detailed temporal specification of video resolution to obtain the renewal after in detail sequential retouch
State.
10. EDID management methods as claimed in claim 7, it is characterised in that the video input interface be USB interface,
HDMI, DVI interface or DisplayPort interfaces.
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Cited By (8)
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| CN108762707A (en) * | 2018-05-29 | 2018-11-06 | 西安万像电子科技有限公司 | The adaptive approach of multimedia information acquisition, device and system |
| CN109889909A (en) * | 2019-04-04 | 2019-06-14 | 合肥惠科金扬科技有限公司 | A kind of display control method, system and terminal device |
| CN109936708A (en) * | 2019-04-28 | 2019-06-25 | 科大讯飞股份有限公司 | A kind of VGA video switching device, method and system |
| CN110825677A (en) * | 2018-08-09 | 2020-02-21 | 中兴通讯股份有限公司 | Display hot plug processing method, system, equipment and storage medium |
| CN111240629A (en) * | 2020-01-17 | 2020-06-05 | 深圳市世纪创新显示电子有限公司 | Method for switching and displaying double EDID data |
| CN111447378A (en) * | 2020-04-13 | 2020-07-24 | 南京巨鲨显示科技有限公司 | Control method and system for video signal switching equipment |
| CN112908226A (en) * | 2021-01-22 | 2021-06-04 | 亚世光电(集团)股份有限公司 | Method and device for detecting display screen parameter switching by using HDMI (high-definition multimedia interface) of PC (personal computer) |
| CN114286138A (en) * | 2021-01-14 | 2022-04-05 | 海信视像科技股份有限公司 | Display device, external device and multi-view-angle proportion display method |
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| CN110825677A (en) * | 2018-08-09 | 2020-02-21 | 中兴通讯股份有限公司 | Display hot plug processing method, system, equipment and storage medium |
| CN109889909A (en) * | 2019-04-04 | 2019-06-14 | 合肥惠科金扬科技有限公司 | A kind of display control method, system and terminal device |
| CN109936708A (en) * | 2019-04-28 | 2019-06-25 | 科大讯飞股份有限公司 | A kind of VGA video switching device, method and system |
| CN109936708B (en) * | 2019-04-28 | 2021-05-04 | 科大讯飞股份有限公司 | VGA video switching device, method and system |
| CN111240629A (en) * | 2020-01-17 | 2020-06-05 | 深圳市世纪创新显示电子有限公司 | Method for switching and displaying double EDID data |
| CN111447378A (en) * | 2020-04-13 | 2020-07-24 | 南京巨鲨显示科技有限公司 | Control method and system for video signal switching equipment |
| CN114286138A (en) * | 2021-01-14 | 2022-04-05 | 海信视像科技股份有限公司 | Display device, external device and multi-view-angle proportion display method |
| CN114286138B (en) * | 2021-01-14 | 2023-08-18 | 海信视像科技股份有限公司 | Display device, external device and multi-view angle proportional display method |
| CN112908226A (en) * | 2021-01-22 | 2021-06-04 | 亚世光电(集团)股份有限公司 | Method and device for detecting display screen parameter switching by using HDMI (high-definition multimedia interface) of PC (personal computer) |
| CN112908226B (en) * | 2021-01-22 | 2022-07-01 | 亚世光电(集团)股份有限公司 | Method and device for detecting display screen parameter switching by using HDMI (high-definition multimedia interface) of PC (personal computer) host |
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