CN115086766A - Video equipment interaction method and system - Google Patents
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- CN115086766A CN115086766A CN202210850094.6A CN202210850094A CN115086766A CN 115086766 A CN115086766 A CN 115086766A CN 202210850094 A CN202210850094 A CN 202210850094A CN 115086766 A CN115086766 A CN 115086766A
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- 230000003993 interaction Effects 0.000 title claims description 39
- 230000002452 interceptive effect Effects 0.000 claims abstract description 24
- 230000005284 excitation Effects 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 123
- 230000008859 change Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 8
- 230000002159 abnormal effect Effects 0.000 description 4
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- 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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
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- 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
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
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- 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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440263—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the spatial resolution, e.g. for displaying on a connected PDA
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- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The application provides a video device interaction method and system, and relates to the field of device interaction. Detect DDC passageway communication information through interactive device, based on the DDC passageway communication information that detects, send the excitation to video source equipment, video source equipment receives the excitation, send the EDID request to display device, trigger video source equipment to be interrupted regular acquire EDID information to display device, the realization need not the hot plug and can carry out acquireing of EDID information, can improve accuracy and the promptness of acquireing EDID information, the improvement shows unusual prosthetic flexibility in the display system scene of use, tightness and treatment effeciency, display system's reliability under the specific scene has been adapted to, correct output display information to diversified video display system on the market has provided powerful assurance.
Description
Technical Field
The present invention relates to the field of device interaction, and in particular, to a video device interaction method and system.
Background
When the video source device sends an Extended Display Identification Data (EDID) request, the Display device may have EDID executed in different degrees, and these inconsistencies may cause operation problems, such as the Display device being unable to Display the content of the video source device or displaying the content of the video source device abnormally. For example, in some cases, for example, due to incomplete power-on initialization of the display device, the DDC channel (i.e., the channel in which the display device is connected to the video source device) is not provided with EDID information easily, and if the DDC channel is not provided with the EDID information, the video source device cannot acquire EDID data, and thus cannot distinguish the video data format that can be received by the display device, and cannot output a correct video signal, and thus the display device is not displayed.
The above problem is mostly caused by the failure of the video source device to correctly acquire the EDID information. At present, the method for correctly acquiring the EDID information is only used for carrying out hot plug and redetection to acquire the EDID signal again or restarting video source equipment. Under a specific environment, the feasibility is poor, for example, under the conditions that the service environment does not support the shutdown of equipment, does not support the exposure of a VGA interface, does not support hot plug and the like, the difficulty of display recovery is increased.
Disclosure of Invention
The application provides a video device interaction method and a video device interaction system, which are used for improving the accuracy and timeliness of EDID information acquired by video source equipment and improving the flexibility, tightness and processing efficiency of abnormal display repair in scenes using a display system.
In one aspect, the invention provides a video device interaction method, which is based on an interaction apparatus and a video source device, wherein the video source device is provided with a DDC channel for connecting a display device, and the interaction apparatus is mounted on the DDC channel;
the video equipment interaction method comprises the following steps:
after detecting that the display equipment is accessed, the video source equipment sends an extended display identification data EDID request to the display equipment;
after receiving the EDID request, the display equipment sends EDID information to the video source equipment through a DDC channel;
the interactive device detects information sent on the DDC channel in real time and sends excitation to the video source equipment based on a detection result;
and after receiving the excitation, the video source equipment sends an EDID request to the display equipment.
Further, the step of sending, by the interaction means, a stimulus to the video source device based on the detection result includes:
the interaction device sends a first current signal to the video B signal line based on the detection result;
the first current signal causes the level of the video B signal line to change, thereby generating the stimulus to the video source device.
Further, the specific implementation step of the interaction device sending the first current signal to the video B signal line based on the detection result includes:
if the detection result is that the information sent by the DDC channel contains EDID information, detecting the EDID information sent by the DDC channel, judging whether the format of the detected EDID information is correct or not, and outputting the judgment result as a detection result;
if the detection result is that the information sent on the DDC channel does not contain EDID information, outputting the EDID information which is not detected as a detection result;
and selecting a preset timing strategy to start timing according to the detection result, and sending the first current signal to the video B signal line after timing is finished.
Further, selecting a preset timing strategy according to the detection result includes:
if the detected result is that the format of the EDID information is correct, timing is started according to a first timing duration;
if the detected result is that the format of the EDID information is not correct, timing is started according to a second timing duration;
and if the detection result is that the EDID information is not detected, starting timing according to a third timing length.
Further, selecting a preset timing strategy according to the detection result includes:
after each time of starting timing, the interaction device does not select a preset timing strategy to start new timing according to the detection result;
and when each time of timing is finished, the interaction device selects a preset timing strategy to start new timing according to the current latest generated detection result.
In another aspect, the present application provides a video device interaction system, which includes an interaction apparatus and a video source device, where the video source device is provided with a DDC channel for connecting a display device, and the interaction apparatus is mounted on the DDC channel; wherein:
the video source device is used for sending an extended display identification data EDID request to the display device after detecting that the display device is accessed;
the display equipment is used for receiving the EDID request and sending EDID information to the video source equipment;
the interactive device is used for detecting information sent on the DDC channel in real time and sending excitation to the video source equipment based on a detection result;
the video source device is further configured to send an EDID request to the display device after receiving the stimulus.
Further, the interaction device comprises: the EDID detection circuit and the first processing unit; wherein,
the EDID detection circuit is used for detecting the information sent by the DDC channel in real time, respectively detecting the EDID information sent by the DDC channel when the detection result is that the information sent by the DDC channel contains the EDID information, judging whether the format of the detected EDID information is correct or not, and outputting the judgment result as the detection result; the DDC channel is used for sending the information which is not detected to the DDC channel, and the information which is not detected to the DDC channel is used as a detection result to be output when the detection result is that the information sent by the DDC channel does not contain EDID information;
the first processing unit is used for sending the excitation to the video source equipment according to the detection result output by the EDID detection circuit.
Further, the first processing unit includes: the circuit comprises a timer circuit, a voltage generator, a current mirror circuit and a system output circuit;
the input end of the timer circuit is connected with the output end of the EDID detection circuit, and the output end of the voltage generator is connected with the input end of the current mirror circuit;
the output end of the current mirror circuit and the output end of the timer circuit are connected with the input end of the system output circuit;
the output end of the system output circuit is connected with the video source equipment through a video B signal line;
the voltage generator is used for generating a first voltage signal;
the current mirror circuit is used for generating a first current signal according to the first voltage signal;
the timer circuit is used for selecting a preset timing strategy to start timing according to the detection result output by the EDID detection circuit, and sending a logic result to the system output circuit after timing is finished, wherein the logic result is used for indicating the system output circuit to output the first current signal;
the system output circuit is used for connecting the first current signal to the video B signal line after receiving the first current signal and the logic result so as to stimulate a video source device to send an EDID request to the display device;
the video B signal line is a blue signal line B signal line of a color video signal line RGB signal line.
Further, the selecting a preset timing strategy according to the detection result output by the EDID detection circuit includes:
if the detection result output by the EDID detection circuit is that the detected EDID information format is correct, timing is started according to a first timing duration;
if the detection result output by the EDID detection circuit is that the detected EDID information format is incorrect, timing is started according to a second timing duration;
and if the detection result is that the EDID information is not detected, starting timing according to a third timing length.
Further, the selecting a preset timing strategy according to the detection result output by the EDID detection circuit includes:
after each time of starting timing, the timer circuit does not select a preset timing strategy to start new timing according to the detection result;
and when each time of timing is finished, the timer circuit selects a preset timing strategy to start new timing according to the current latest generated detection result.
The technical scheme provided by the invention can bring the following beneficial effects:
the DDC (Display Data Channel) Channel communication information is detected through the interaction device, the video source equipment is triggered to break regularity to acquire EDID information from the Display equipment, the accuracy and timeliness of acquiring the EDID information can be improved, the flexibility, the tightness and the processing efficiency of abnormal Display restoration in a scene of using the Display system are improved, the reliability of the Display system under a specific scene is adapted, and powerful guarantee is provided for the accurate output of the Display information of various video Display systems in the market.
Drawings
In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic illustration of an environment for implementing an embodiment provided by an embodiment of the present application;
fig. 2 is a flowchart of a video device interaction method according to an embodiment of the present application;
FIG. 3 is a schematic illustration of an environment for implementing an embodiment provided by another embodiment of the present application;
fig. 4 is a flowchart of a video device interaction method according to another embodiment of the present application;
fig. 5 is a schematic diagram of a video device interaction system according to another embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
EDID information exchange is a standardized method for demonstrating the performance of display devices and video source devices in communication. This communication is to allow the display device to send its own performance characteristics to the video source device, such as native resolution, to enable the video source device to generate video characteristics appropriate for the display device requirements. The user can furthest improve the compatibility between the devices without manual adjustment, thereby reducing the influence on the display image and the overall reliability of the system caused by incorrect setting and adjustment.
EDID was originally developed for a VGA (Video graphics Array) interface of a computer, and information such as an original resolution and a support resolution of a display device, which reflects a Video characteristic of the display device, is stored in the EDID, so that the EDID information is stored in a memory chip of the display device. The video source device may be a desktop computer or a notebook computer, which needs to read the EDID information of the display device to output the corresponding video signal according to the EDID information.
The EDID/DDC protocol adopts an I2C (Inter-Integrated Circuit) bus standard to carry out EDID information interaction. EDID information is typically exchanged when the video source device is powered on. When starting, the VGA interface of video source equipment can send an EDID request to display equipment through a DDC channel, namely an I2C bus, reads the EDID information stored in the display equipment, or when unplugging and plugging a VGA connecting wire again, the video source equipment carries out the EDID request through detecting B (Blue, Blue signal line) signal line voltage transformation on an RGB (Red Green Blue, color video signal line) signal line so as to acquire the EDID information.
Refer to fig. 1, which illustrates a schematic diagram of an environment for implementing an embodiment of the present application. The embodiment implementation environment includes a video source device 100, a display device 101, and a DDC channel 102.
The video source device 100 refers to a device for providing source video, and alternatively, the video source device 100 may be an electronic device such as a PC (Personal Computer), a tablet Computer, a mobile phone, or the like. The video source device 100 may transmit the EDID request to the display device 101 upon detecting that the display device 101 is connected.
The display apparatus 101 is composed of a display device and related circuits, and can provide visual information in accordance with visual perception factors. Alternatively, the display apparatus 101 may be an electron beam tube display apparatus, a flat panel type display apparatus, and a projection type display apparatus, which are not limited in this application.
The DDC channel 102, i.e., the display data channel, is a data channel used by the video source device 100 to access the memory of the display device 101 to acquire EDID format data in the display device 101 and determine display attribute information of the display device 101.
Illustratively, the video source device 100 is connected to the display device 101 through the DDC channel 102, and when detecting that the display device 101 is connected, the video source device 100 sends an EDID request to the display device 101 through the DDC channel 102, and when receiving the EDID request, the display device 101 sends EDID information to the video source device 100 through the DDC channel 102.
In the following, the technical solution of the present application will be described by several embodiments.
In one embodiment, the present application provides a video device interaction method, which is based on an interaction apparatus and a video source device, wherein the video source device is provided with a DDC channel for connecting a display device, and the interaction apparatus is mounted on the DDC channel;
the video equipment interaction method comprises the following steps:
s1: after detecting that the display equipment is accessed, the video source equipment sends an extended display identification data EDID request to the display equipment;
s2: after receiving the EDID request, the display equipment sends EDID information to the video source equipment through the DDC channel;
s3: the interactive device detects information sent on the DDC channel in real time and sends excitation to the video source equipment based on the detection result;
optionally, the step of sending, by the interaction apparatus, the stimulus to the video source device based on the detection result includes:
the interaction device sends a first current signal to the video B signal line based on the detection result;
the first current signal changes the level of the video B signal line, thereby generating an excitation to the video source device.
Optionally, the specific implementation step of the interaction device sending the first current signal to the video B signal line based on the detection result includes:
if the EDID information is detected, judging whether the format of the detected EDID information is correct or not, and outputting a judgment result serving as a detection result;
if the EDID information is not detected, outputting the EDID information which is not detected as a detection result;
and selecting a preset timing strategy according to the detection result to start timing, and sending a first current signal to the video B signal line after timing is finished.
Optionally, selecting a preset timing policy according to the detection result includes:
if the detected result is that the format of the EDID information is correct, timing according to a first timing duration;
if the detected result is that the EDID information format is not correct, timing is started according to a second timing duration;
and if the detection result is that the EDID information is not detected, starting timing according to a third timing length.
Optionally, selecting a preset timing policy according to the detection result includes:
after each time of starting timing, the interaction device does not select a preset timing strategy to start new timing according to the detection result;
and when each time of timing is finished, the interaction device selects a preset timing strategy to start new timing according to the current latest generated detection result.
S4: the video source device sends an EDID request to the display device after receiving the stimulus.
Referring to fig. 2, a flowchart of a video device interaction method according to an embodiment of the present application is shown. The method can comprise the following steps (201-205).
The interactive device refers to a device for assisting a video source apparatus to interact with a display apparatus.
As shown in fig. 3, the video source device 301 and the display device 303 are connected through a DDC channel 304, and the interactive apparatus 302 is mounted on the DDC channel 304.
The EDID request is to request EDID information of the display device, which is a VESA (Video Electronics Standards Association) standard data format containing parameters related to the display device and its performance, including vendor information, maximum image size, color setting, vendor preset, limit of frequency range, and character string of display name and serial number. The video source equipment detects the access of the display equipment through the DDC channel and sends an EDID request to the display equipment.
And step 203, the display device receives the EDID request and sends EDID information to the video source device through the DDC channel.
Stimulus refers to a level signal used to stimulate the video source device to send an EDID request to the display device.
To sum up, in the embodiment provided by the application, the interaction device sends the excitation to the video source device, so that the EDID information can be acquired without hot plug, the flexibility, the tightness and the processing efficiency of abnormal display repair in a use scene are improved, and the reliability of the display system in a specific scene is adapted.
Referring to fig. 4, a flow chart of a video device interaction method according to another embodiment of the present application is shown. The method can comprise the following steps (401-410).
And step 403, after receiving the EDID request, the display device sends the EDID information to the video source device through the DDC channel.
Illustratively, the interactive device detects the EDID information in the DDC channel, determines whether the EDID information format is correct, and outputs the determination result as a detection result. And detecting whether the EDID information format is correct or not. Illustratively, the interactive device does not detect the EDID information, and outputs the undetected EDID information as a detection result, which is used for showing the undetected EDID information.
Optionally, the interactive device is pre-stored with the correct EDID information format.
And after each time of timing is finished, the interaction device respectively sends a first current signal to the video B signal line.
Optionally, after each time of starting timing, the interactive device does not select a preset timing strategy to start new timing according to the detection result; and when each time of timing is finished, the interaction device selects a preset timing strategy to start new timing according to the current latest generated detection result.
Optionally, if the detected result is that the format of the EDID information is correct, timing is started according to the first timing duration; if the detected result is that the format of the EDID information is not correct, timing is started according to a second timing duration; and if the detection result is that the EDID information is not detected, starting timing according to a third timing length. Optionally, the first timing duration, the second timing duration, and the third timing duration may be set according to an actual situation, which is not limited in this application. Optionally, the first timing duration, the second timing duration, and the third timing duration may be the same or different, and this application does not limit this.
Illustratively, if the detected result is that the format of the EDID information is correct, timing is started according to a first timing duration of 5 seconds; if the detected result is that the format of the EDID information is not correct, timing is started according to the second timing duration of 3 seconds; and if the detection result is that the EDID information is not detected, starting timing according to the third timing duration of 1 second.
The first current signal causes the level of the video B signal line to change, thereby generating an excitation to the video source device, step 406.
In step 407, the video source device sends an EDID request to the display device after receiving the stimulus.
To sum up, in the embodiment that this application provided, detect DDC passageway communication state through interactive device, trigger video source equipment and be interrupted regularity and acquire EDID information to display device, the realization need not hot plug and can carry out the acquirement of EDID information, can improve the accuracy and the promptness of acquireing EDID information, the flexibility, the leakproofness and the treatment effeciency of using to show abnormal repair in the display system scene have been improved, display system's reliability under the specific scene has been adapted to, accurate output display information to diversified video display system on the market provides powerful assurance.
The following are embodiments of the system of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the system of the present application, reference is made to the embodiments of the method of the present application.
Referring to fig. 5, a schematic diagram of a video device interaction system according to an embodiment of the present application is shown. The system has the function of realizing the video equipment interaction method, and the function can be realized by hardware or by hardware executing corresponding software. The system 500 comprises an interaction means 520 and a video source device 510, said video source device 510 being provided with a DDC channel 540 for connecting a display device 530, the interaction means 520 being mounted on said DDC channel 540.
Wherein:
the video source device 510 is configured to send an extended display identification data EDID request to the display device 530 after detecting that the display device 530 is accessed;
the display device 530 is configured to receive the EDID request and send EDID information to the video source device 510;
an interactive device 520, configured to detect EDID information sent over the DDC channel 540 in real time, and send an excitation to the video source device 510 based on a detection result;
the video source device 510 is further configured to send an EDID request to the display device 530 upon receiving the stimulus.
In some examples, the interaction means 520 comprises: EDID detection circuit 521 and a first processing unit; wherein,
an EDID detection circuit 521, configured to detect information sent over the DDC channel in real time, and detect EDID information sent over the DDC channel when the detection result indicates that the information sent over the DDC channel includes the EDID information, and determine whether the format of the detected EDID information is correct or not, and output the determination result as a detection result; and the DDC channel is also used for outputting the EDID information which is not detected as a detection result when the detection result is that the information sent on the DDC channel does not contain the EDID information.
Optionally, the EDID detection circuit includes a shift register device and a comparison output device. Optionally, the shift register apparatus includes a shift register circuit and a matching circuit. Optionally, the matching circuit comprises an input matching circuit and an output high impedance circuit. Optionally, the comparison output device includes an operational amplifier circuit and a logic gate circuit.
Optionally, the shift register device can store at least 6 bytes of data information, so as to ensure the accuracy of detecting the EDID information.
Optionally, the EDID detection circuit pre-stores EDID information of the display device, illustratively, correct EDID information of the display device is pre-stored in the comparison output device, and after detecting the EDID information in the DDC channel, the EDID detection circuit compares the EDID information with the correct EDID information of the display device pre-stored in the comparison output device to obtain a comparison result and outputs the comparison result as the detection result.
And the first processing unit is used for sending the excitation to the video source equipment according to the detection result output by the EDID detection circuit.
In some examples, the first processing unit includes: a timer circuit 522, a voltage generator 523, a current mirror circuit 524, and a system output circuit 525;
the input end of the timer circuit 522 is connected with the output end of the EDID detection circuit 521, and the output end of the voltage generator 523 is connected with the input end of the current mirror circuit 524;
the output terminal of the current mirror circuit 524 and the output terminal of the timer circuit 522 are both connected to the input terminal of the system output circuit 525;
an output terminal of the system output circuit 525 is connected to the video source device 510 via a video B signal line of the DDC channel 540;
the voltage generator 523 is configured to generate a first voltage signal.
Alternatively, the first voltage signal may be set according to actual conditions.
Alternatively, the voltage generator 523 includes an oscillation circuit, an operational amplification device, and a modulation circuit. Optionally, the oscillating circuit comprises an inductor, a capacitor and a matching chip. Optionally, the operational amplification means comprises an operational amplifier and a positive feedback circuit. Optionally, the modulation circuit comprises a matching circuit and a voltage follower circuit.
Illustratively, an oscillating circuit of the voltage generator generates a low-frequency sine waveform, the low-frequency sine waveform is shaped by the operational amplifier and is changed into a low-frequency square wave, the low-frequency square wave passes through the matching chip and outputs a direct current wave of a specific voltage, the direct current wave passes through the matching circuit and the voltage follower circuit to form a voltage source for outputting a first voltage signal, and the voltage generator is high in voltage precision and large in output impedance.
The current mirror circuit 524 is configured to output a first current signal according to the first voltage signal.
Optionally, the current mirror circuit 524 includes a preceding stage mirror follower circuit and a succeeding stage matching output circuit. Optionally, the preceding stage mirror image follower circuit includes a symmetric transistor amplifier circuit and a matching circuit. Optionally, the rear-stage matching output circuit comprises a high-side transistor and a low-side transistor, and the high-side transistor and the low-side transistor of the rear-stage output circuit improve circuit matching capability, avoid influencing data of a DDC channel and an RGB channel to the maximum extent, and ensure data rigidness.
Illustratively, the preceding stage image following circuit of the current mirror device receives the first voltage signal output by the voltage generator, and the subsequent stage matching output circuit of the current mirror device outputs the first current signal.
And the timer circuit 522 is configured to select a preset timing strategy to start timing according to the detection result output by the EDID detection circuit, and send a logic result to the system output circuit after timing is finished, where the logic result is used to instruct the system output circuit 525 to output the first current signal.
Optionally, the timer circuit 522 includes an oscillator circuit and an operational amplifier device. Optionally, the oscillator circuit includes a high-frequency inductor, a high-frequency capacitor, and a matching circuit, and the operational amplifier device includes an operational amplifier, a positive feedback circuit, and an output matching circuit.
Illustratively, the comparison output device of the EDID detection circuit outputs a logic result to the timer circuit, the oscillating circuit of the timer circuit generates a sine wave with a preset frequency, the sine wave is transmitted to the operational amplification circuit to be shaped and output a square wave with a specific frequency, the matching circuit clocks the square wave according to the detection result of the EDID detection circuit, and the logic result is output when the timing time is exceeded or reached.
In some examples, the timer circuit 522 does not select a preset timing strategy to start new timing according to the detection result after each timing is started; the timer circuit 522 selects a preset timing strategy to start new timing according to the current latest detection result when each timing is finished.
A system output circuit 525 for coupling said first current signal to said video B signal line upon receipt of said first current signal and said logic result to stimulate the video source device 510 to send an EDID request to said display device 530.
Optionally, the system output circuit 525 includes a logic circuit and a matching circuit. Alternatively, the logic circuit includes a logic circuit such as an and logic gate circuit or a nor logic gate circuit. Optionally, the matching circuit comprises a reverse blocking circuit, a high impedance matching output circuit.
Illustratively, the logic circuit of the system output circuit receives the logic output of the timer circuit, alternatively, the logic circuit of the system output circuit may receive the logic output of an external circuit of the system as desired, and the matching circuit of the system output circuit receives the first current signal of the current mirror device. Optionally, the current output of the matching circuit of the system output circuit, the logic result is used to instruct the system output circuit to output the first current signal.
The video B signal line is a blue signal line B signal line of a color video signal line RGB signal line.
In some examples, the selecting a preset timing policy according to the detection result output by the EDID detection circuit includes:
if the detection result output by the EDID detection circuit is that the detected EDID information format is correct, timing is started according to a first timing duration;
and if the detection result output by the EDID detection circuit is that the detected EDID information format is incorrect, timing is started according to the second timing duration.
The same and similar parts among the various embodiments in this specification may be referred to each other. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the description in the method embodiment.
In the embodiments provided in the present invention, it should be understood that the disclosed system and method can be implemented in other ways. For example, the system embodiments described above are merely illustrative, and for example, the division of the circuit is merely a logical division, and there may be other divisions when actually implemented, for example, a plurality of circuits or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, circuits or units, and may be in an electrical, mechanical or other form.
In addition, each functional circuit in the embodiments of the present invention may be integrated into one processing circuit, or each circuit may exist alone physically, or two or more circuits may be integrated into one circuit.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions should be within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure and the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A video equipment interaction method is characterized in that the video equipment interaction method is based on an interaction device and a video source equipment, wherein the video source equipment is provided with a DDC channel for connecting a display equipment, and the interaction device is mounted on the DDC channel;
the video equipment interaction method comprises the following steps:
after detecting that the display equipment is accessed, the video source equipment sends an extended display identification data EDID request to the display equipment;
after receiving the EDID request, the display equipment sends EDID information to the video source equipment through a DDC channel;
the interactive device detects information sent on the DDC channel in real time and sends excitation to the video source equipment based on a detection result;
and after receiving the excitation, the video source equipment sends an EDID request to the display equipment.
2. The method of claim 1, wherein the step of sending an incentive to the video source device by the interactive device based on the detection result comprises:
the interaction device sends a first current signal to the video B signal line based on the detection result;
the first current signal causes the level of the video B signal line to change, thereby generating the stimulus to the video source device.
3. The method of claim 2, wherein the step of sending the first current signal to the video B signal line by the interactive device based on the detection result comprises:
if the detection result is that the information sent by the DDC channel contains EDID information, detecting the EDID information sent by the DDC channel, judging whether the format of the detected EDID information is correct or not, and outputting the judgment result as a detection result;
if the detection result is that the information sent on the DDC channel does not contain EDID information, outputting the EDID information which is not detected as a detection result;
and selecting a preset timing strategy to start timing according to the detection result, and sending the first current signal to the video B signal line after timing is finished.
4. The method of claim 3, wherein selecting a predetermined timing strategy according to the detection result comprises:
if the detected result is that the format of the EDID information is correct, timing is started according to a first timing duration;
if the detected result is that the format of the EDID information is not correct, timing is started according to a second timing duration;
and if the detection result is that the EDID information is not detected, starting timing according to a third timing length.
5. The method of claim 3, wherein selecting a predetermined timing strategy according to the detection result comprises:
after each time of starting timing, the interaction device does not select a preset timing strategy to start new timing according to the detection result;
and when each time of timing is finished, the interaction device selects a preset timing strategy to start new timing according to the current latest generated detection result.
6. A video equipment interactive system is characterized by comprising an interactive device and a video source equipment, wherein the video source equipment is provided with a DDC channel for connecting a display equipment, and the interactive device is mounted on the DDC channel; wherein:
the video source device is used for sending an extended display identification data EDID request to the display device after detecting that the display device is accessed;
the display device is used for receiving the EDID request and sending EDID information to the video source device;
the interactive device is used for detecting information sent on the DDC channel in real time and sending excitation to the video source equipment based on a detection result;
the video source device is further configured to send an EDID request to the display device after receiving the stimulus.
7. The system of claim 6, wherein the interaction means comprises: the EDID detection circuit and the first processing unit; wherein,
the EDID detection circuit is used for detecting the information sent by the DDC channel in real time, respectively detecting the EDID information sent by the DDC channel when the detection result is that the information sent by the DDC channel contains the EDID information, judging whether the format of the detected EDID information is correct or not, and outputting the judgment result as the detection result; the DDC channel is used for sending information which is not detected to the DDC channel;
the first processing unit is used for sending the excitation to the video source equipment according to the detection result output by the EDID detection circuit.
8. The system of claim 7, wherein the first processing unit comprises: the circuit comprises a timer circuit, a voltage generator, a current mirror circuit and a system output circuit;
the input end of the timer circuit is connected with the output end of the EDID detection circuit, and the output end of the voltage generator is connected with the input end of the current mirror circuit;
the output end of the current mirror circuit and the output end of the timer circuit are connected with the input end of the system output circuit;
the output end of the system output circuit is connected with the video source equipment through a video B signal line;
the voltage generator is used for generating a first voltage signal;
the current mirror circuit is used for outputting a first current signal according to the first voltage signal;
the timer circuit is used for selecting a preset timing strategy to start timing according to the detection result output by the EDID detection circuit, and sending a logic result to the system output circuit after timing is finished, wherein the logic result is used for indicating the system output circuit to output the first current signal;
the system output circuit is used for connecting the first current signal to the video B signal line after receiving the first current signal and the logic result so as to stimulate a video source device to send an EDID request to the display device;
the video B signal line is a blue signal line B signal line of a color video signal line RGB signal line.
9. The system according to claim 8, wherein the selecting a predetermined timing strategy according to the detection result outputted from the EDID detection circuit comprises:
if the detection result output by the EDID detection circuit is that the detected EDID information format is correct, timing according to a first timing duration;
if the detection result output by the EDID detection circuit is that the detected EDID information format is incorrect, timing is started according to a second timing duration;
and if the detection result is that the EDID information is not detected, starting timing according to a third timing length.
10. The system according to claim 8, wherein the selecting a predetermined timing strategy according to the detection result outputted from the EDID detection circuit comprises:
after each time of starting timing, the timer circuit does not select a preset timing strategy to start new timing according to the detection result;
and when each time of timing is finished, the timer circuit selects a preset timing strategy to start new timing according to the current latest generated detection result.
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