CN104994320B - A kind of HDMI service equipments - Google Patents

A kind of HDMI service equipments Download PDF

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Publication number
CN104994320B
CN104994320B CN201510325067.7A CN201510325067A CN104994320B CN 104994320 B CN104994320 B CN 104994320B CN 201510325067 A CN201510325067 A CN 201510325067A CN 104994320 B CN104994320 B CN 104994320B
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hdmi
switch unit
control
switch
control terminal
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CN104994320A (en
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郭登科
杨元成
岳光生
李见
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Hisense Visual Technology Co Ltd
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Qingdao Hisense Electronics Co Ltd
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Abstract

Body of the embodiment of the present invention provides a kind of HDMI service equipments, is related to TV technology, to reduce the generation of the screen flicker phenomenon of HDMI service equipments.HDMI service equipments include：HDMI interface, transmission branch, first switch unit, and control processor；The first end of transmission branch and the voltage pin of HDMI interface connect, and the second end of transmission branch and the HPD pins of HDMI interface connect；The first end of first switch unit is connected with transmission branch, and the second end ground connection of first switch unit, the control terminal of first switch unit is connected with control processor；Control processor, for when definite HDMI external equipments access the HDMI service equipments, control signal being sent to the first switch unit, to control the conducting and disconnection of the first switch unit.The present invention is suitable for the scene of HDMI data transfers.

Description

A kind of HDMI service equipments
Technical field
The present invention relates to TV technology, more particularly to a kind of HDMI service equipments.
Background technology
HDMI (Hi-Definition Multimedia Interface, high-definition media interface) is that a kind of digitlization regards Frequently/audio interface technology, is the tailored version digital interface for being adapted to audio-visual transmission, widely in display fields such as television sets Use.
Possess at present and HDMI interface is both provided with the chip or equipment of video processing function, so as to promote more IP factories Family develops the IP modules for possessing HDMI data processing functions.And HDMI need to be followed when carrying out HDMI data transfers by IP modules Agreement.The IP modules of different manufacturers exploitation are both provided with there are detail differences in HDMI external equipments and HDMI service equipments IP modules, the IP modules of HDMI external equipments set to send the IP modules of HDMI data, HDMI clothes to HDMI service equipments The IP modules that HDMI data are sent for reception external equipment that the IP modules for equipment of being engaged in are set, take in HDMI external equipments and HDMI After business equipment establishes HDMI connections, since IP modules are to carry out HDMI data transfers according to HDMI agreements, passing through Before IP modules carry out HDMI data transfers, need first by the IP modules of the IP modules of HDMI external equipments and HDMI service equipments into The configuration of row HDMI agreements.And stop transmission HDMI numbers since existing HDMI service equipments are unable to control HDMI external equipments According to, therefore the IP modules there are HDMI external equipments and the IP modules of HDMI service equipments carry out the configuration process of HDMI agreements In, HDMI external equipments send the situation of HDMI data to HDMI service equipments, can cause the display of HDMI service equipments at this time Screen flicker, reduces the viewing experience of user.
The content of the invention
The embodiment provides a kind of HDMI service equipments, show to reduce the screen flicker of HDMI service equipments The generation of elephant, improves the viewing experience of user.
To reach above-mentioned purpose, the embodiment of the present invention adopts the following technical scheme that：
In a first aspect, an embodiment of the present invention provides a kind of HDMI service equipments, including：HDMI interface, transmission branch, the One switch element, and control processor；Wherein, the first switch unit includes：First end, second end and control terminal；It is described The first end of transmission branch is connected with the voltage pin of the HDMI interface, and the second end of the transmission branch connects with the HDMI The hot plug detection HPD pin connections of mouth；The first end of the first switch unit is connected with the transmission branch, and described first The second end ground connection of switch element, the control terminal of the first switch unit are connected with the control processor；At the control Device is managed, for when definite HDMI external equipments access the HDMI service equipments, sending and controlling to the first switch unit Signal, to control the conducting and closing of the first switch unit.
An embodiment of the present invention provides a kind of HDMI service equipments, including：HDMI interface, transmission branch, first switch list Member, and control processor；Wherein, first switch unit includes：First end, second end and control terminal；The first end of transmission branch It is connected with the voltage pin of HDMI interface, the second end of transmission branch and the HPD pins of HDMI interface connect, first switch unit First end be connected with transmission branch, the second end of first switch unit ground connection, the control terminal of first switch unit with control Manage device connection；Control processor, for when definite HDMI external equipments access HDMI service equipments, being sent out to first switch unit Control signal is sent, to control the conducting of first switch unit and closing.In this way, in HDMI service equipments, control processor exists When determining that HDMI external equipments access to HDMI service equipments, control signal can be sent to first switch unit, to control the The conducting and disconnection of one switch element.And when control processor controls first switch unit to turn on by control signal, due to The second end ground connection of first switch unit, therefore the first end of first switch unit also corresponds to be grounded, and first switch unit First end be connected with transmission branch, transmission branch is equivalent to ground connection at this time, therefore transmission branch can not be by from HDMI interface The voltage signal that voltage pin receives is sent to the HPD pins of HDMI interface.At this time, HDMI external equipments can not get high electricity Ordinary mail number, therefore HDMI external equipments are without the transmission of HDMI data.So, HDMI external equipments IP modules with The IP modules of HDMI service equipments are carried out in the configuration process of HDMI agreements, and HDMI service equipments can pass through its control processor First end and the second end conducting of first switch unit are controlled, makes transmission of the HDMI external equipments without HDMI data, so HDMI is serviced in the IP modules of HDMI external equipments carry out the configuration process of HDMI agreements with the IP modules of HDMI service equipments Equipment will not be there is a phenomenon where screen flicker, and then realizes the generation for the screen flicker phenomenon for reducing HDMI service equipments, carries The purpose of the viewing experience of high user.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art Required attached drawing is briefly described, it should be apparent that, drawings in the following description are only some realities of the present invention Example is applied, for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings Obtain other attached drawings.
Fig. 1 is a kind of structure diagram of HDMI service equipments provided in an embodiment of the present invention；
Fig. 2 is the structure diagram of another kind HDMI service equipments provided in an embodiment of the present invention；
Fig. 3 is the structure diagram of another kind HDMI service equipments provided in an embodiment of the present invention；
Fig. 4 is the structure diagram of another kind HDMI service equipments provided in an embodiment of the present invention；
Fig. 5 is the structure diagram of another kind HDMI service equipments provided in an embodiment of the present invention；
Fig. 6 is the structure diagram of another kind HDMI service equipments provided in an embodiment of the present invention；
Fig. 7 is the structure diagram of another kind HDMI service equipments provided in an embodiment of the present invention；
Fig. 8 is the structure diagram of another kind HDMI service equipments provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts Embodiment, belongs to the scope of protection of the invention.
An embodiment of the present invention provides a kind of HDMI service equipments, as shown in Figure 1, including：HDMI(Hi-Definition Multimedia Interface, high-definition media interface) interface 11, transmission branch 12, at first switch unit 13 and control Manage device 14.
Wherein, first switch unit 13 includes：First end, second end and control terminal.
The first end 121 of transmission branch 12 is connected with the voltage pin of HDMI interface 11, the second end 122 of transmission branch 12 With HPD (Hot Plug Detection, hot plug detection) pin connection of HDMI interface 11.
The first end of first switch unit 13 is connected with transmission branch 12, the second end ground connection of first switch unit 13, the The control terminal of one switch element 13 is connected with control processor 14.
Control processor 14, for definite HDMI external equipments access HDMI service equipments when, to first switch unit 13 send control signal, to control the conducting of first switch unit 13 and disconnection.
Refer to it should be noted that the first end of first switch unit 13 is connected with transmission branch 12, first switch unit 13 first end connection is connected with transmission branch 12, and between the first end 121 and second end 122 of transmission branch 12.
Specifically, the first end 121 and the voltage of HDMI interface 11 of the transmission branch 12 that HDMI service equipments include are drawn Foot connects, and the second end 122 of transmission branch 12 is connected with the HPD pins of HDMI interface 11, and such transmission branch 12 can be by it The high level signal received by the voltage pin of HDMI interface 11 is transmitted to, the HDMI interface 11 being connected with its second end 122 HPD pins, so as to which high level signal is transmitted in HDMI external equipments by the HPD pins of HDMI interface 11, with Just HDMI external equipments carry out the biography of HDMI data after the high level signal that the HPD pins for receiving HDMI interface 11 transmit It is defeated.
The first end of the first switch unit 13 included in HDMI service equipments is connected with transmission branch 12, first switch list The second end ground connection of member 13, the control terminal of first switch unit 13 are connected with control processor 14.In this way, first switch unit 13 The first end of control signal control first switch unit 13 that is sent according to control processor 14 of control terminal and leading for second end Through and off are opened.
The control processor 14 included in HDMI service equipments can determine whether HDMI external equipments access HDMI services Equipment, and when HDMI external equipments access HDMI service equipments, control signal, control first are sent to first switch unit 13 The conducting and disconnection of switch element 13.It is to make the conducting of first switch unit 13 in the control signal that control processor 114 is sent out During signal, at this time, when the control terminal of first switch unit 13 receives the control signal of this conducting for making first switch unit 13, The first end of control first switch unit 13 is turned on second end.And the first end in first switch unit 13 is turned on second end When, since the second end of first switch unit 13 is grounded, first end also corresponds to be grounded at this time, and the of first switch unit 13 One end is connected with transmission branch 12, and when first end is grounded, transmission branch 12 also corresponds to be grounded.In this way, 12 nothing of transmission branch The high level signal received from the voltage pin of HDMI interface 11 is transmitted to the HDMI interface being connected with its second end 122 by method again 11 HPD pins, so that HDMI external equipments can not receive high level signal by the HPD pins of HDMI interface 11, So as to without the transmission of HDMI data.
And when the control signal that control processor 14 is sent out is the signal for the disconnection for making first switch unit 13, at this time, the When the control terminal of one switch element 13 receives the control signal of this disconnection for making first switch unit 13, first switch list is controlled The first end of member 13 is disconnected with second end.In this way, the first end of first switch unit 13 be not grounded, with first switch unit 13 The transmission branch 12 of first end connection be also no longer grounded so that transmission branch 12 can will be by its first end 121 from HDMI The HDMI interface 11 that the second end 122 that the high level signal that the voltage pin of interface 11 receives is transmitted to transmission branch 12 connects HPD pins.So that after HDMI external equipments get high level signal by the HPD pins of HDMI interface 11, Jin Erjin The transmission of row HDMI data.So as to ensure that the normal communication of HDMI external equipments and HDMI service equipments.
Further, since the detection pin of HDMI interface 11 can detect whether that HDMI external equipments are accessing HDMI service equipments, therefore control processor 14 determines the method and control process of HDMI external equipments access HDMI service equipments Whether device 14 is directly related with the detection pin connection of HDMI interface 11.In the not inspection with HDMI interface 11 of control processor 14 When surveying pin connection, control processor 14 can be determined by other with the equipment that the detection pin of HDMI interface 11 is connected at this time HDMI external equipments access the HDMI service equipments.As, other can with the equipment that the detection pin of HDMI interface 11 is connected Determine whether that the access HDMI services of HDMI external equipments are set with the detection signal sent by the detection pin of HDMI interface 11 It is standby.And the message that whether has HDMI external equipments access HDMI service equipments will be identified and sent to control processor 14, at this time Control processor 14 can according to reception identify whether have HDMI external equipments access HDMI service equipments message determine Whether there are HDMI external equipments to access HDMI service equipments.As go out to have HDMI external equipments to access HDMI in above-mentioned message identifier During the message of service equipment, then control processor 14 can determine that HDMI external equipments access HDMI service equipments.
Alternatively, control processor 14 directly determines whether that HDMI external equipments access by the detection pin of HDMI interface HDMI service equipments.At this time, as shown in Fig. 2, control processor 14 is also connected with the detection pin of HDMI interface 11.
Control processor 14, specifically in the first detection signal of the detection pin output of HDMI interface 11, to the One switch element 13 sends control signal, to control the conducting of first switch unit 13 and disconnection.
Wherein, first detection signal is indicated for the signal of HDMI external equipments access HDMI service equipments.
Specifically, control processor 14 is connected with the detection pin of HDMI interface 11, in this way, control processor 14 can root According to HDMI interface 11 detection pin export detection signal or whether have HDMI external equipments access HDMI service equipments. When control processor 14 receives first detection signal by the detection pin of HDMI interface 11, HDMI external equipments can be known The signal of HDMI service equipments is accessed, control processor can send control signal to first switch unit 13 at this time, with control The conducting and disconnection of first switch unit 13.
That is, the HDMI interface 11 of HDMI service equipments detect HDMI external equipments access when, at control Manage device 14 and send first detection signal, for control processor 14 when receiving first detection signal, knowing has the HDMI external at this time Equipment accesses HDMI interface 11, at this time in order to ensure after HDMI external equipments access HDMI service equipments, HDMI external equipments The configuration process of HDMI agreements is carried out with the IP modules of HDMI service equipments, HDMI external equipments are not carried out to HDMI service equipments The transmission of HDMI data, control processor 14 send the letter for being used for controlling first switch unit 13 to turn on to first switch unit 11 Number.After the control terminal of first switch unit 11 is received for controlling the signal that first switch unit 13 turns at this time, it is controlled First end and second end conducting.So since the second end of first switch unit 13 is grounded, the of first switch unit 13 at this time One end also corresponds to be grounded, and the first end of first switch unit 13 is connected with transmission branch 12, in first switch unit 13 When first end is grounded, transmission branch 12 also corresponds to be grounded.In this way, transmission branch 12 can not be again by from the voltage of HDMI interface 11 The high level signal that pin receives is transmitted to the HPD pins for the HDMI interface 11 being connected with its second end 122, so that HDMI External equipment can not receive high level signal by the HPD pins of HDMI interface 11, so that the transmission without HDMI data.
And the IP modules in HDMI external equipments and HDMI service equipments are carried out after the completion of the configuration of HDMI agreements, it is necessary to HDMI external equipments and HDMI service equipments carry out the transmission of HDMI data, and at this time, control processor 14 is to first switch unit 11 send the signal for being used for controlling first switch unit 13 to disconnect.The control terminal of first switch unit 13 is received for controlling the After the signal that one switch element 13 disconnects, first end and the second end of control first switch unit 13 disconnect, such first switch The first end of unit 13 be not grounded, and the transmission branch 12 being connected with the first end of first switch unit 13 is also no longer grounded, and is made The high level signal that obtaining transmission branch 12 will can be received by its first end 121 from the voltage pin of HDMI interface 11 be transmitted to The HPD pins for the HDMI interface 11 that the second end 122 of transmission branch 12 connects.So that HDMI external equipments are connect by HDMI After the HPD pins of mouth 11 get high level signal, and then carry out the transmission of HDMI data.So as to ensure that HDMI external equipments With the normal transmission for carrying out HDMI data of HDMI service equipments.
It should be noted that the control signal that control processor 14 is sent can be AC signal.At this point it is possible to it is set in The high level signal of control signal, for controlling first switch unit 13 to turn on.And the ground level signal of control signal, for controlling First switch unit 13 processed disconnects.Or the high level signal of control signal is set, for controlling first switch unit 13 disconnected Open.And the ground level signal of control signal, for controlling first switch unit 13 to turn on.
Alternatively, control signal can also be two kinds of different signals, it is that control signal includes：First signal and the second letter Number.At this time, the first signal, for controlling first switch unit 13 to turn on.Secondary signal, for controlling first switch unit 13 disconnected Open.The present invention is without limitation.
Further, after accessing HDMI service equipments due to HDMI external equipments, it is directly entered the mistake of HDMI protocol configurations Journey, therefore whether control processor 14 can carry out HDMI protocol configurations according to HDMI service equipments and be opened to realize to described first Close unit and send control signal.Specific implementation is as follows：
Control processor 14, specifically for accessing HDMI service equipments in definite HDMI external equipments, carries out HDMI agreements During configuration, the first signal is sent to first switch unit 13, and after the completion of HDMI protocol configurations, sent out to first switch unit 13 Send secondary signal.
The control terminal of first switch unit 13, for when receiving the first signal, the of control first switch unit 13 One end is turned on second end.When receiving secondary signal, first end and the second end of control first switch unit 13 disconnect.
Specifically, after accessing HDMI service equipments due to HDMI external equipments, HDMI external equipments and HDMI service equipments IP modules need to carry out HDMI protocol configurations, in order to prevent in HDMI protocol configuration process, HDMI external equipments are to HDMI Service equipment transmits HDMI data, and control processor 14 can access HDMI service equipments in definite HDMI external equipments at this time, When carrying out HDMI protocol configurations, the first signal is sent to first switch unit 13.The control terminal of first switch unit 13 receives After first signal, the first end of first switch unit 13 can be controlled to be turned on second end, so due to first switch unit 13 Second end ground connection, first end also corresponds to be grounded at this time, and the first end of first switch unit 13 is connected with transmission branch 12, When first end is grounded, transmission branch 12 also corresponds to be grounded.In this way, transmission branch 12 can not be again by from the electricity of HDMI interface 11 The high level signal that pressure pin receives is transmitted to the HPD pins for the HDMI interface 11 being connected with its second end 122, so that HDMI external equipments can not receive high level signal by the HPD pins of HDMI interface 11, thereby may be ensured that outside HDMI Connecing the IP modules of equipment and HDMI service equipments needs during carrying out HDMI protocol configurations, and HDMI external equipments take with HDMI Be engaged in equipment without HDMI data transmission.
And, it is necessary to ensure that HDMI external equipments are normally carried out with HDMI service equipments after the completion of HDMI protocol configurations The transmission of HDMI data, at this time control processor 14 can be sent after the completion of HDMI protocol configurations to first switch unit 13 Secondary signal.After the control terminal of first switch unit 13 receives secondary signal, the first end of control first switch unit 13 with Second end disconnects, and the first end of such first switch unit 13 be not grounded, is being connected with the first end of first switch unit 13 Transmission branch 12 is also no longer grounded so that transmission branch 12 will can be drawn by the voltage of its first end 121 from HDMI interface 11 The HPD pins for the HDMI interface 11 that the second end 122 that the high level signal that foot receives is transmitted to transmission branch 12 connects.So that After HDMI external equipments get high level signal by the HPD pins of HDMI interface 11, and then carry out the biography of HDMI data It is defeated.So as to ensure that the normal transmission for carrying out HDMI data of HDMI external equipments and HDMI service equipments.
Need to illustrate, control processor 14 determines that HDMI service equipments carry out the methods of HDMI protocol configurations can be with Be HDMI service equipments when carrying out HDMI protocol configurations, one can be sent to control processor 14 and indicates that its carries out HDMI associations Discuss the message of configuration.Similarly, control processor 14 determines that the method that the HDMI protocol configurations of HDMI service equipments are completed can be, HDMI service equipments send one when HDMI protocol configurations are completed, to control processor 14 and indicate that its HDMI protocol configuration is completed Message.Certainly, control processor 14 can also be determined by other methods HDMI service equipments carry out HDMI protocol configurations and really Determine the completion of HDMI protocol configurations.For example, protocol configuration stage and configuration completion stage can be preset, in HDMI external equipments After accessing HDMI service equipments, HDMI service equipments need to be introduced into the protocol configuration stage.And pre-set protocol configuration rank The setup time of section.Then control processor 14 knows that HDMI takes after HDMI external equipments access HDMI service equipments are determined Business equipment enters the protocol configuration stage, can determine that HDMI service equipments are carrying out HDMI protocol configurations at this time.And When reaching the setup time in protocol configuration stage, then control processor 14 determines that HDMI service equipments enter the configuration completion stage, It can determine that HDMI service equipments fly the completion of HDMI protocol configurations at this time.The present invention is without limitation.
Alternatively, after accessing HDMI service equipments due to HDMI external equipments, the process of HDMI protocol configurations is directly entered, and And the duration of HDMI protocol configurations can be known by experiment.Therefore control processor 14 is used to connect in definite HDMI external equipments When entering the HDMI service equipments, the specific implementation of control signal is sent also as described below to first switch unit 12.
Control processor 14, specifically for definite HDMI external equipments access HDMI service equipments when, to first switch Unit 13 sends the first signal of preset duration, and after the first signal of preset duration is sent, is sent out to first switch unit 13 Send the secondary signal of preset duration.
At this time, the control terminal of first switch unit 13, for when receiving the first signal, controlling first switch unit 13 First end turned on second end.When receiving secondary signal, the first end of control first switch unit 13 is broken with second end Open.
Specifically, after accessing HDMI service equipments due to HDMI external equipments, HDMI external equipments and HDMI service equipments IP modules be directly entered HDMI protocol configurations, therefore in order to prevent in HDMI protocol configuration process, HDMI external equipments to HDMI service equipments transmit HDMI data, and control processor 14 can access HDMI service equipments in definite HDMI external equipments, When carrying out HDMI protocol configurations, the first signal of preset duration is sent to first switch unit 13.That is, in preset duration Interior, the control terminal of first switch unit 13 can receive the first signal of the transmission of control processor 14.So, default In duration, after the control terminal of first switch unit 13 receives the first signal, the first end of first switch unit 13 can be controlled Turned on second end, so since the second end of first switch unit 13 is grounded, first end also corresponds to be grounded at this time, and first The first end of switch element 13 is connected with transmission branch 12, and when first end is grounded, transmission branch 12 also corresponds to be grounded.This The high level signal received from the voltage pin of HDMI interface 11 can not be transmitted to and its second end by sample, transmission branch 12 again The HPD pins of the HDMI interface 11 of 122 connections, so that HDMI external equipments can not pass through the HPD pins of HDMI interface 11 Receive high level signal, thereby may be ensured that in preset duration, HDMI external equipments and HDMI service equipments without The transmission of HDMI data.The IP modules that thereby may be ensured that in HDMI external equipments and HDMI service equipments carry out HDMI agreements and match somebody with somebody During putting, transmission of the HDMI external equipments with HDMI service equipments without HDMI data, and then can prevent outside HDMI Connect equipment and the IP modules of HDMI service equipments are carried out in HDMI protocol configuration process, the screen flicker of HDMI service equipments.
It should be noted that preset duration, which is HDMI external equipments and the IP modules of HDMI service equipments, carries out HDMI associations Time needed for view configuration.
And control processor 14 sends second after it has sent the first signal of preset duration to first switch unit 13 Signal.After the control terminal of first switch unit 13 receives secondary signal, the first end and second of control first switch unit 13 End disconnects, and the first end of such first switch unit 13 be not grounded, the transmission being connected with the first end of first switch unit 13 Branch 12 is also no longer grounded so that transmission branch 12 will can be connect by the voltage pin of its first end 121 from HDMI interface 11 The HPD pins for the HDMI interface 11 that the second end 122 that the high level signal of receipts is transmitted to transmission branch 12 connects.So that After HDMI external equipments get high level signal by the HPD pins of HDMI interface 11, and then carry out the transmission of HDMI data. In this manner it is ensured that after the completion of HDMI protocol configurations, it is necessary to ensure HDMI external equipments and HDMI service equipments normally into The transmission of row HDMI data,
It should be noted that control processor 14 can also now determine that HDMI external equipments access in fact by other methods During HDMI service equipments, control signal is sent to first switch unit 13, the present invention is without limitation.
It should be noted that HDMI external equipments can be connected by HDMI interface with HDMI service equipments.And HDMI When external equipment is that HDMI service equipments carry out HDMI data transfers, HDMI interface need to be passed through receiving HDMI service equipments After the high level signal that 11 HPD pins are sent to, HDMI data transfers could be carried out.
It should be noted that the first of the preset duration that control processor 14 is sent to the control terminal of first switch unit 13 During signal, preset duration is default settings, can be set in advance according to the actual requirements, such as preset duration can be 100ms (millisecond), the present invention are without limitation.
It should be noted that the first signal can be high level signal or low level signal, other letters are can also be Number.Secondary signal can be low level signal or high level signal, can also be other signals different from the first signal, The present invention is without limitation.
It should be noted that high level signal refers to the voltage signal more than predeterminated voltage.Low level signal refers to less In the voltage signal of predeterminated voltage.Wherein, predeterminated voltage is pre-set according to the actual requirements.
Further, above-mentioned HDMI service equipments, as shown in figure 3, including：Control unit 15, second switch unit 16, and Power branch 17.
Wherein, second switch unit 16 includes：First end, second end and control terminal.
The first end of control unit 15 is connected with the control terminal of second switch unit 16, the control terminal of control unit 15 with The detection pin connection of HDMI interface 11, the second end of control unit 15, for being connected with power-supply device.
One end of power branch 17 is connected with the first end 121 of transmission branch 12, the other end and the detection of HDMI interface 11 Pin connect, for HDMI interface 11 detection pin output second detection signal when, to the first end 121 of transmission branch 12 Export predeterminated voltage.
At this time, the first end of first switch unit 13 be connected with transmission branch 12 including：
The first end of second switch unit 16 is connected with the first end of transmission branch 12, the second end of second switch unit 16 It is connected with the first end of first switch unit 13.
Control unit 15, for the detection signal exported according to the detection pin of HDMI interface 11, controls second switch list The conducting and disconnection of member 16.
Wherein, the second detection signal is indicated for the signal that MHL external equipments access the HDMI service equipments.
It should be noted that (Mobile High-Definition Link, mobile terminal high-definition audio and video standard connect MHL Mouthful) it is a kind of audio-visual standard interface for connecting portable consumer electronic device.HDMI interface can compatible MHL interface.Due to MHL Interface is different from the effect of HDMI interface, therefore during HDMI interface compatibility MHL interface, HDMI interface can be according to the external of access Equipment is different, realizes different functions.In the external input access HDMI interface of HDMI, then HDMI interface realizes HDMI interface Function.When MHL external equipments access HDMI interface, then HDMI interface realizes the function of MHL interface.And realized in HDMI interface During the function of MHL interface, HDMI service equipments can export predeterminated voltage to MHL external equipments, so as to be filled for MHL external equipments Electricity.At this time, HDMI service equipments can export predeterminated voltage by the voltage pin of HDMI interface to MHL external equipments.And The HDMI interface of HDMI service equipments, need to be by HPD pins and MHL external equipments into line number when realizing the function of MHL interface According to communication, therefore, in order to ensure that HDMI interface normally realizes the function of MHL interface, transmission branch 12 cannot be at this time State.
Specifically, in order to make HDMI interface compatibility MHL interface, further included in HDMI service equipments：Control unit 15, the Two switch elements 16, and power branch 17.In this way, the first end of control unit 15 and the control terminal of second switch unit 16 connect Connect, the control terminal of control unit 15 is connected with the detection pin of HDMI interface 11, the second end and power-supply device of control unit 15 Connection.So, the detection that the detection pin for the HDMI interface 11 that control unit 15 can be received according to its control terminal exports The difference of signal, controls the conducting and disconnection of its first end and second end.Also, control unit 15, for according to HDMI interface The detection signal of 11 detection pin output, the conducting and disconnection of control second switch unit 16.
Control unit 15 controls conducting and the specific method disconnected and second switch unit 16 of second switch unit 16 Type is related.
Specifically, when second switch unit 16 is N-type switch element, at this time, second switch unit 16 needs to receive High level signal could turn on, and when not receiving high level signal, be not turned on.In this way, control unit 15 is needing control second When switch element 16 turns on, the first end of control unit 15 can be controlled to be turned on second end.Due to the first of control unit 15 End is connected with the control terminal of second switch unit 16, and the second end of control unit 15 is connected with power-supply device, therefore single in control When the first end of member 15 is turned on second end, the high level signal of power-supply device input can be transmitted to second switch unit 16 Control terminal, and then the control terminal of second switch unit 16 is received the first end of second switch unit 16 after high level signal Turned on second end.
And when needing to control second switch unit 16 to disconnect, the first end and second end that can control control unit 15 are broken Open.At this time, the first end of control unit 15 cannot receive the high level signal of power-supply device input, so that second switch The high level signal that the control terminal of unit 16 does not receive power-supply device input make it that the control terminal of second switch unit 16 can not The first end of control second switch unit 16 is turned on second end.
When second switch unit 16 is p-type switch element, second switch unit 16 needs to receive low level signal It can turn on, be not turned on when not receiving low level signal.Control unit 15 further includes the 3rd end, and the of control unit 15 at this time Three ends are grounded.In this way, control unit 15 is when needing to control second switch unit 16 to turn on, due to the first end of control unit 15 It is connected with the control terminal of second switch unit 16, the 3rd end ground connection of control unit 15, the control terminal of control unit 15 can at this time To control the first end of control unit 15 to be turned on the 3rd end, the first end of control unit 15 is equal to ground connection at this time, so as to be The control terminal of second switch unit 16 provides low level signal, and the control terminal of such second switch unit 16 can be by second switch The first end of unit 16 is turned on second end.
And when needing to control second switch unit 16 to disconnect, the first end and the 3rd end that can control control unit 15 are broken Open, or first end is turned on second end.At this time, the first end of control unit 15 cannot receive low level signal or connect High level signal is received, so that the control terminal of second switch unit 16, which does not receive low level signal, causes second switch list The control terminal of member 16 is unable to control the first end of second switch unit 16 and is turned on second end, as the of second switch unit 16 One end is disconnected with second end.
And the first end of second switch unit 15 is connected with the first end 121 of transmission branch 12, second switch unit 15 Second end is connected with the first end of first switch unit, and so, conducting and the disconnection of second switch unit 15 can control The conducting and disconnection of transmission branch 12.So as to which when HDMI external equipments access HDMI interface 11, transmission branch 12 turns on. When MHL external equipments access HDMI interface 11, transmission branch 12 disconnects.
Further, one end of power branch 17 is connected with the first end 121 of transmission branch 12, the other end and HDMI interface 11 detection pin connection.So when HDMI interface 11 realizes the function of MHL interface, also need pre- to the output of MHL external equipments If voltage, therefore power branch 17 is known outside MHL when receiving the second detection signal by the detection pin of HDMI interface 11 Equipment access HDMI interface 11 is connect, power branch 17 exports predeterminated voltage to the first end 121 of transmission branch 12, and then transmits branch The first end 121 on road 12 exports predeterminated voltage to MHL external equipments by the voltage pin of HDMI interface 11, realizes to MHL Charging external equipment.
That is, in HDMI interface compatibility MHL interface, when HDMI interface realizes the function of HDMI interface, it is When HDMI external equipments access HDMI interface 11, the detection pin of HDMI interface 11 exports first detection signal at this time, with HDMI The control terminal and power branch 17 of the control unit 15 of the detection pin connection of interface 11 can receive first detection signal. After power branch 17 receives first detection signal, predeterminated voltage is not exported.
Since transmission branch 12 needs the high level signal that its first end 121 receives being transmitted to its second end 122, Second switch unit 16 is needed to turn on.In this way, after control unit 15 receives first detection signal, control second switch unit 16 Conducting, so that the high level signal that the first end 121 of transmission branch 12 receives is transmitted to its second end 122.And in HDMI When external equipment accesses HDMI interface 11, in order to ensure that HDMI external equipments and the IP modules of HDMI service equipments carry out HDMI associations The configuration process of view, HDMI external equipments do not carry out the transmission of HDMI data to HDMI service equipments, and control processor 14 is to the One switch element 11 sends the signal for being used for controlling first switch unit 13 to turn on.The control termination of first switch unit 13 at this time After receiving for controlling the signal that first switch unit 13 turns on, its first end and second end is controlled to turn on.So due to first The second end ground connection of switch element 13, the first end of first switch unit 13 also corresponds to be grounded at this time, and first switch unit 13 first end is connected with transmission branch 12, and in the first end ground connection of first switch unit 13, transmission branch 12 also corresponds to Ground connection.In this way, transmission branch 12 again can not be transmitted to the high level signal received from the voltage pin of HDMI interface 11 and it The HPD pins for the HDMI interface 11 that second end 122 connects, so that HDMI external equipments can not pass through HDMI interface 11 HPD pins receive high level signal, so that the transmission without HDMI data.
And after the completion of the configuration that the IP modules of HDMI external equipments and HDMI service equipments carry out HDMI agreements, at control Reason device 14 sends the signal for being used for controlling first switch unit 13 to disconnect, first switch list to the control terminal of first switch unit 13 After the control terminal of member 13 is received for controlling the signal that first switch unit 13 disconnects, its first end is controlled to break with second end Open.In this way, the first end of first switch unit 13 be not grounded, the transmission branch being connected with the first end of first switch unit 13 12 are also no longer grounded so that transmission branch 12 will can be received by its first end 121 from the voltage pin of HDMI interface 11 The HPD pins for the HDMI interface 11 that the second end 122 that high level signal is transmitted to transmission branch 12 connects.So that outside HDMI Connect after equipment gets high level signal by the HPD pins of HDMI interface 11, and then HDMI external equipments is serviced with HDMI Equipment carries out the transmission of HDMI data.
When HDMI interface realizes the function of MHL interface, when being MHL external equipments access HDMI interface 11, at this time Detection pin output the second detection signal of HDMI interface 11, the control unit 15 being connected with the detection pin of HDMI interface 11 Control terminal and power branch 17 can receive the second detection signal.Due to needing the first end by transmission branch 12 at this time 121 export predeterminated voltage to the voltage pin of HDMI interface 11, and then are set by the voltage pin of HDMI interface 11 to MHL is external Standby output predeterminated voltage, and by the HPD pins of HDMI interface 11 and MHL external equipments into row data communication.Therefore need Transmission branch 12 is disconnected, as disconnects second switch unit 16.At this time, the control terminal of control unit 15 receives the second inspection After surveying signal, control second switch unit 16 disconnects.And power branch 17 receives the detection pin output of HDMI interface 11 After second detection signal, predeterminated voltage is exported to the first end of transmission branch 12, and then the first end 121 of transmission branch 12 will be pre- If voltage is exported to MHL external equipments by the voltage pin of HDMI interface 11, realize to MHL charging external equipments.
Further, above-mentioned control unit 15, as shown in figure 4, including:First switch module 151 and second switch module 152。
Wherein, first switch module 151 includes first end, second end and control terminal.Second switch module 152 includes first End, second end and control terminal.
At this time, the first end of control unit 15 be connected with the control terminal of second switch unit 16 including：Second switch module 152 first end is connected with the control terminal of second switch unit 16.
The control terminal of control unit 15 be connected with the detection pin of HDMI interface 11 including：The control of first switch module 151 End processed is connected with the detection pin of HDMI interface 11.
The second end of control unit 15, for be connected with power-supply device including：The first end of first switch module 151 and The control terminal of two switch modules 152, for being connected with power-supply device.
The second end of first switch module 151 and the second end ground connection of second switch module 152.
It should be noted that in embodiments of the present invention, second switch module 152 is N-type switch module, and second switch Unit 16 is p-type switch element.
Specifically, the detection pin connection of the control terminal HDMI interface of first switch module 151, is, first switch mould The first end for the detection signal control first switch module 151 that the control terminal of block 151 is exported according to the detection pin of HDMI interface And the conducting and closing of second end.Since the first end of first switch module 151 is used to be connected with power-supply device, first switch mould The second end ground connection of block 151, therefore when the control terminal of first switch module 151 receives first detection signal, first switch mould The first end and second end of the control terminal control first switch module 151 of block 151 disconnect.Due to the control of second switch module 152 End processed is used to be connected with power-supply device, therefore first of the control terminal control first switch module 151 in first switch module 151 When end and second end disconnect, power-supply device can provide high level signal for the control terminal of second switch module 152, be, the The control terminal of two switch modules 152 receives high level signal, the control terminal control second switch module of second switch module 152 152 first end and second end conducting.Since the second end of second switch module 152 is grounded, and the of second switch module 152 One end is connected with the control terminal of second switch unit 16, therefore, second switch mould is controlled in the control terminal of second switch module 152 When first end and the second end conducting of block 152, the control terminal of second switch unit 16 is equivalent to ground connection, then equivalent to second switch The control terminal of unit 16 receives low level signal, when the control terminal of second switch unit 16 receives low level signal, control First end and the second end conducting of second switch unit 16, turn on transmission branch 12, so transmission branch 12 can by its The high level signal that one end 121 receives is transmitted to its second end 122, and HDMI interface can realize the function of HDMI interface at this time.
When the control terminal of first switch module 151 receives the second detection signal, the control terminal control of first switch module 151 First end and the second end conducting of first switch module 151 processed.Due to, the second end ground connection of first switch module 151, and second The control terminal of switch module 152 is used to be connected with power-supply device, therefore is opened in the control terminal control first of first switch module 151 When closing first end and the second end conducting of module 151, the control terminal of second switch module 152 second is opened at this time equivalent to ground connection The control terminal for closing module 152 controls second switch mould equivalent to low level signal, the control terminal of second switch module 152 is received The first end and second end of block 152 disconnect.At this time, the control terminal of second switch unit 16 does not receive any signal, then and second Switch element 16 disconnects, and then the high level signal that transmission branch 12 can not receive its first end 121 is transmitted to its second end 122, at this time HDMI interface can realize the function of MHL interface.
Further, first switch module 151 for MOS (Mental-Oxide-Semiconductor, metal-oxide- Semiconductor) pipe.Second switch module 152 is the first bipolar transistor.
At this time, the control terminal of first switch module 151 is the grid of metal-oxide-semiconductor, and the first end of first switch module 151 can be with It is the drain electrode of metal-oxide-semiconductor, the second end of first switch module 151 can be the source electrode of metal-oxide-semiconductor.Alternatively, first switch module 151 First end can be the source electrode of metal-oxide-semiconductor, and the second end of first switch module 151 can be the drain electrode of metal-oxide-semiconductor.The present invention to this not It is limited.Wherein, in embodiments of the present invention, it is the drain electrode of metal-oxide-semiconductor with the first end of first switch module 151, first switch The second end of module 151 is illustrated exemplified by the source electrode of metal-oxide-semiconductor, as shown in Figure 5.
The control terminal of second switch module 152 be the first bipolar transistor base stage, the first of second switch module 152 Hold as collector, the second end of second switch module 152 is emitter.
Further, above-mentioned HDMI service equipments, refering to what is shown in Fig. 5, further including：First resistor 18, with first resistor 18 The second resistance 19 of series connection, 3rd resistor 20, the 4th resistance 21 and the first capacitance 22.
At this time, the control terminal of first switch module 151 be connected with the detection pin of HDMI interface 11 including：First switch mould The control terminal of block 151 is connected with second resistance 19, and the 3rd external equipment is connected with first resistor 18.As, the grid of metal-oxide-semiconductor with Second resistance 15 connects, and the detection pin of HDMI interface 11 is connected with first resistor 18.
The first end of first switch module 151 and the control terminal of second switch module 152 are connected with 3rd resistor 20.
At this time, the control terminal of the first end of first switch module 151 and second switch module 152, specifically for passing through Three resistance 20 are connected with power-supply device.As, the base stage of the drain electrode of metal-oxide-semiconductor and the first bipolar transistor is respectively used to by Three resistance 20 are connected with power-supply device.
One end of first capacitance 22 is connected with the control terminal of second switch module 152, other end ground connection.As, the first electricity One end of appearance 22 is connected with the base stage of the first bipolar transistor, other end ground connection.
The first end of second switch module 152 be connected with the control terminal of second switch unit 16 including：Second switch module 152 first end is connected by the 4th resistance 21 with the control terminal of second switch unit 16.As, first bipolar transistor Collector be connected with the control terminal of second switch unit 16 including：The collector of first bipolar transistor passes through the 4th resistance 21 It is connected with the control terminal of second switch unit 16.
In this way, first resistor 18 and second resistance 19 are acted on partial pressure, and then it can prevent the 3rd external equipment from sending Control signal when being high voltage signal, prevent it more than the maximum voltage of the control circuit of HDMI data transfers.3rd resistor 20 there is partial pressure to act on, and prevent that the voltage in the voltage signal of external power supply equipment input is excessive.4th resistance 21 has current limliting Effect.First capacitance 22 has the function that filtering.
Further, second switch unit 16 is the second bipolar transistor, with reference to shown in figure 5.
At this time, the control terminal of second switch unit 16 is the base stage of the second bipolar transistor.Second switch unit 16 First end is the emitter of the second bipolar transistor, and the first end of second switch unit 16 is the collection of the second bipolar transistor Electrode.
That is, control unit 15 be connected with the control terminal of second switch unit 16 including：Second bipolar transistor Base stage be connected with control unit 15.
The first end of second switch unit 16 is connected with the first end 121 of transmission branch 12, and the of second switch unit 16 Two ends be connected with the first end of first switch unit 13 including：The of the emitter of second bipolar transistor and transmission branch 12 One end 121 connects, and the collector of the second bipolar transistor is connected with the first end of first switch unit 13.
Further, first switch unit 13 is the 3rd bipolar transistor, with reference to shown in figure 4.
At this time, the control terminal of first switch unit 13 is the base stage of the 3rd bipolar transistor.First switch unit 13 First end is the collector of the 3rd bipolar transistor.The second end of first switch unit 13 is the hair of the 3rd bipolar transistor Emitter-base bandgap grading.
That is, the first end of first switch unit 13 be connected with transmission branch 12 including：3rd bipolar transistor Collector be connected with transmission branch 12.
The second end ground connection of first switch unit 13 includes：The emitter ground connection of 3rd bipolar transistor.
Further, above-mentioned HDMI service equipments, as shown in fig. 6, including：5th resistance 23, the 6th resistance 24, the 7th electricity 25 and the 8th resistance 26 of resistance.
Wherein, the 5th resistance 23 is connected with the 6th resistance 24.
At this time, the first end of first switch unit 13 be connected with transmission branch 12 including：5th resistance 23 is series at second Between the second end of switch element 16 and the first end of first switch unit 13, the 6th resistance 24 is series at first switch unit 13 First end and transmission branch 12 second end between.
The control terminal of first switch unit 13 be connected with control processor 14 including：The control terminal of first switch unit 13 is led to The 7th resistance 25 is crossed to be connected with control processor 14.
The control terminal of first switch unit 13, is additionally operable to power-supply device connect by the 7th resistance 25 and the 8th resistance 26 Connect.
In this way, setting the 5th resistance 23 and the 6th resistance 24 being cascaded in transmission branch 12, can transmit When branch 12 transmits high level signal, prevent that the voltage of the high level signal of transmission is excessive, have necessarily to transmission branch 12 Protective effect.Equally, the 7th resistance 27 can first switch unit 13 receive control processor 14 send the first signal or During secondary signal, prevent control processor 14 send the first signal or secondary signal voltage it is excessive, to first switch unit 13 have certain protective effect.
The control terminal of first switch unit 13 is connected by the 7th resistance 27 and the 8th resistance 28 with power-supply device, in this way, The signal that first switch unit 13 receives can be strengthened.
Further, in power branch 17, as shown in fig. 7, comprises：Process chip 171, the 9th resistance 172 are parallel with one another Second capacitance 173 and the 3rd capacitance 174.
The grounding pin ground connection of process chip 171, the first input pin and the second input pin are used to connect power supply, enable Pin is connected with the detection pin of HDMI interface 11, the detection signal of the detection pin output for receiving HDMI interface, current limliting Pin is connected with one end of the 9th resistance 172, the first output pin and the second output pin respectively with transmission branch 12 first The connection of end 121, one end of the second capacitance 173, one end connection of the 3rd capacitance 174.The other end of 9th resistance 172, the second electricity Hold 173 other end, and the other end ground connection of the 3rd capacitance 174.
Process chip 171, in detection pin output the second detection signal of HDMI interface, the output of control first to be drawn Foot and the second output pin output predeterminated voltage.
It should be noted that the 1st pin that can be using the grounding pin of process chip 171 as process chip 171, first 2nd pin of the input pin as process chip 171,3rd pin of second input pin as process chip 171 are enabled to draw 4th pin of the foot as process chip 171,5th pin of the current limliting pin as process chip 171, the first output pin conduct 6th pin of process chip 171,7th pin of second output pin as process chip 171.
It should be noted that process chip 171 and being not only to include 7 pins, other pins can also be included, this Invent without limitation.
It should be noted that in HDMI interface 11, the voltage pin of HDMI interface 11 is that HDMI external equipments pass through it The pin of voltage is provided to HDMI service equipments, is usually the 18th pin of HDMI interface.The HPD pins of HDMI interface 11 are 19th pin of pin from the HDMI interface 11 to HDMI external equipment output control signals, usually HDMI interface.HDMI interface 11 detection pin indicates that HDMI interface realizes HDMI interface function or realizes the pin of MHL interface function, is usually 2nd pin of HDMI interface.
It should be noted that HDMI interface can compatible MHL interface, at this time can using the 2nd pin of HDMI interface as The detection pin of MHL interface, the VBUS pins using the 18th pin of HDMI interface as MHL interface, by the 19th of HDMI interface the CBUS pin of the pin as MHL interface.Wherein, the VBUS pins of MHL interface be mobile power supply equipment pin, MHL interface CBUS pins be pin with mobile device communication.
It is connected below with control processor 14 with the detection pin of HDMI interface 11, what control processor 14 was sent is used to control The signal that first switch unit 13 processed turns on is the first signal, and what control processor 14 was sent is used to control first switch unit 13 The signal of disconnection is secondary signal, and control processor 14 is when definite HDMI external equipments access HDMI service equipments, to First switch unit 14 sends the first signal of preset duration, and after the first signal of preset duration is sent, to first switch Unit 14 send preset duration secondary signal, to control the conducting of first switch unit 13 and disconnection, exemplified by illustrate.
Exemplary, as shown in figure 8, the voltage pin of HDMI interface 11 is the 18th pin of HDMI interface 11, HDMI connects The HPD pins of mouth 11 are the 19th pins of HDMI interface 11, and the first end 121 of transmission branch 12 is drawn with the 18th of HDMI interface 11 Foot connects, and second end 122 is connected with the 19th pin of HDMI interface 11.The detection pin of HDMI interface 11 is HDMI interface 11 2nd pin.
The emitter of second bipolar transistor V2 is connected with the 18th pin of HDMI interface 11, the 3rd bipolar transistor The base stage of V3 is connected by the 7th resistance R7 with control processor 14, and passes through in the base stage of the 3rd bipolar transistor V3 Seven resistance R7 and the 8th resistance R8 are connected with power-supply device.The collector of 3rd bipolar transistor V3 by the 5th resistance R5 with The collector connection of second bipolar transistor V2.The transmitter ground connection of 3rd bipolar transistor V3.First resistor R1 with The 2nd pin connection of HDMI interface 11.And first resistor R1 connects with second resistance R2, second resistance R2 and metal-oxide-semiconductor V0's Grid connects, and the source electrode ground connection of metal-oxide-semiconductor V0, drain electrode is connected by 3rd resistor R3 with power-supply device.First bipolar transistor The base stage of V1 is connected by 3rd resistor R3 with power-supply device, and the collector of the first bipolar transistor V1 passes through the 4th resistance R4 It is connected with the base stage of the second bipolar transistor V2, the emitter ground connection of the first bipolar transistor V1.Wherein, the first bipolarity Transistor V1 is N-type transistor, and the second bipolar transistor is P-type transistor.First capacitance C1 one end connects the first bipolarity The base stage of transistor V1, other end ground connection.
Process chip is N21 chips, and the 4th pin of N21 chips is connected with the 2nd pin of HDMI interface 11, and the 1st pin connects Ground, the 2nd pin and the connection of the 3rd pin and power-supply device, the 5th pin are connected with one end of the 9th resistance R9, the 9th resistance R9's The other end is grounded.6th pin and the 7th pin respectively with the first end 121 of transmission branch 12 and the second capacitance C2 parallel with one another, One end connection of 3rd C3, the second capacitance C2 in parallel, the other end ground connection of the 3rd C3.
It is the function that HDMI interface 11 realizes MHL interface when MHL external equipments access HDMI interface 11.At this time, The 2nd pin output the second detection signal of HDMI interface 11, after the grid of metal-oxide-semiconductor V0 receives the second detection signal, grid is opened Open, source electrode is turned on drain electrode, and the high level signal of power-supply device output at this time is transmitted to ground.And the first bipolar transistor V1 Base stage is not received by high level signal, cannot turn on collector and emitter, therefore first crystal at this time equivalent to ground connection Pipe V1 is disconnected.The base stage of second bipolar transistor V2 is not received by any signal, then the second bipolar transistor V2 is disconnected, Not turn on emitter and collector.4th pin of N21 chips receives the second detection signal, and the 7th pin of N21 chips is defeated Go out predeterminated voltage, and be transmitted to the first end 121 of transmission branch 12 and the second capacitance C2 and the 3rd capacitance C3 of parallel connection, to second Capacitance C2 and the 3rd capacitance C3 chargings.Since the emitter of the second bipolar transistor V2 is not turned on collector, so, pass Defeated branch 12 disconnects, it is impossible to which the predeterminated voltage that its first end 121 receives is transmitted to its second end 122.Therefore transmission branch 12 The predeterminated voltage of reception is transmitted to the 18th pin of HDMI interface 11 by its first end 121.Pass through the of HDMI interface 11 Predeterminated voltage can be transmitted to MHL external equipments by 18 pins, be charged to MHL external equipments.
It is that HDMI interface realizes HDMI interface function when HDMI external equipments access HDMI interface 11.At this time, HDMI External equipment is by the 18th pin of HDMI interface 11, to 121 outputs level signals of first end of transmission branch 12.HDMI interface 11 the 2nd pin output first detection signal, after the grid of metal-oxide-semiconductor V0 receives first detection signal, grid is not turned on, source electrode Disconnected with drain electrode, the high level signal of power-supply device output at this time transmits the base stage of the first bipolar transistor V1, and first is bipolar After the base stage of property transistor V1 receives high level signal, collector and the transmitting of the first bipolar transistor V1 can be turned on Pole.Since the emitter of the first bipolar transistor V1 is grounded, collector and transmitting in the first bipolar transistor V1 After the conducting of pole, the base stage of the second bipolar transistor V2 is equivalent to ground connection, so that it is equivalent to low level signal is received, then the Two bipolar transistor V2 turn on the emitter and collector of the second bipolar transistor V2, then transmission branch 12 turns on, at this time The high level signal that its first end 121 receives can be transmitted to transmission branch by transmission branch 12 by the second bipolar transistor V2 The second end 122 on road 12.
And when control processor 14 receives the first detection signal of the 2nd pin output of HDMI interface 11, control Processor 14 exports the first signal of preset duration to the control terminal of the 3rd bipolar transistor V3, at this time the 3rd bipolar transistor The base stage of pipe V3 can receive the first signal and the voltage of power-supply device output, and the base stage of the 3rd bipolar transistor V3 can be with Turn on the collector and emitter of the 3rd bipolar transistor V3.At this time, since emitter is grounded, the 3rd bipolar transistor The collector of pipe V3 is equivalent to ground connection, and the collector of the 3rd bipolar transistor V3 is connected with transmission branch 12, at this time, transmission Branch 12 is equivalent to ground connection, therefore the high level signal that the first end 121 of transmission branch 12 receives is transmitted to ground, and is not transmitted to 19th pin of HDMI interface 11.So that HDMI external equipments do not receive high level signal, HDMI external equipments without The transmission of HDMI data.
After the base stage of from control processor 14 to the 3rd bipolar transistor V3 have sent the first signal of preset duration, i.e., When time to be turned in the collector of the 3rd bipolar transistor V3 with emitter reaches preset duration, HDMI external equipments with After the completion of the IP modules of HDMI service equipments carry out the configuration of HDMI agreements, control processor 14 is to the 3rd bipolar transistor at this time The base stage of pipe V3 sends secondary signal.Secondary signal is low level signal, and the voltage pull-down that can export power-supply device, The 3rd bipolar transistor V3 is caused to receive low level signal, the 3rd bipolar transistor V3 is not turned on its collector and transmitting Pole.At this time, the high level signal that transmission branch 12 can receive its first end 121 is transmitted to its second end 122.And it can incite somebody to action High level signal is transmitted to the 19th pin of HDMI interface 11, and then is transmitted to by the 19th pin of HDMI interface 11 outside HDMI Connect equipment so that after HDMI external equipments receive high level signal, the transmission of HDMI data is carried out with HDMI service equipments.
And the 4th pin of N21 chips is when receiving first detection signal, the 7th pin of N21 chips does not export high level letter Number.
An embodiment of the present invention provides a kind of HDMI service equipments, including：HDMI interface, transmission branch, first switch list Member, and control processor；Wherein, first switch unit includes：First end, second end and control terminal；The first end of transmission branch It is connected with the voltage pin of HDMI interface, the second end of transmission branch and the HPD pins of HDMI interface connect, first switch unit First end be connected with transmission branch, the second end of first switch unit ground connection, the control terminal of first switch unit with control Manage device connection；Control processor, for when definite HDMI external equipments access HDMI service equipments, being sent out to first switch unit Control signal is sent, to control the conducting of first switch unit and closing.In this way, in HDMI service equipments, control processor exists When determining that HDMI external equipments access to HDMI service equipments, control signal can be sent to first switch unit, to control the The conducting and disconnection of one switch element.And when control processor controls first switch unit to turn on by control signal, due to The second end ground connection of first switch unit, therefore the first end of first switch unit also corresponds to be grounded, and first switch unit First end be connected with transmission branch, transmission branch is equivalent to ground connection at this time, therefore transmission branch can not be by from HDMI interface The voltage signal that voltage pin receives is sent to the HPD pins of HDMI interface.At this time, HDMI external equipments can not get high electricity Ordinary mail number, therefore HDMI external equipments are without the transmission of HDMI data.So, HDMI external equipments IP modules with The IP modules of HDMI service equipments are carried out in the configuration process of HDMI agreements, and HDMI service equipments can pass through its control processor The first signal is sent to the control terminal of first switch unit, is led with the first end and second end of control control first switch unit It is logical, make transmission of the HDMI external equipments without HDMI data, so the IP modules in HDMI external equipments are set with HDMI services HDMI service equipments will not be there is a phenomenon where screen flicker in the configuration process of standby IP modules progress HDMI agreements, and then realizes The generation of the screen flicker phenomenon of HDMI service equipments is reduced, improves the purpose of the viewing experience of user.And at control When managing device by control signal control first switch unit disconnection, the control terminal control first switch unit of first switch unit First end is disconnected with second end.In this way, the first end of first switch unit be not grounded, connect with the first end of first switch unit The transmission branch connect is also no longer grounded so that transmission branch will can be received by its first end from the voltage pin of HDMI interface High level signal be transmitted to transmission branch second end connection HDMI interface HPD pins.Set so that HDMI is external After the standby HPD pins by HDMI interface get high level signal, and then the HDMI between HDMI service equipments can be carried out The transmission of data.It is achieved thereby that the IP modules of HDMI external equipments and the IP modules of HDMI service equipments carry out HDMI agreements In configuration process, HDMI external equipments will not occur with HDMI service equipments without HDMI data transfers, HDMI service equipments Screen flicker.The configuration completion of HDMI agreements is carried out with the IP modules of HDMI service equipments in the IP modules of HDMI external equipments Afterwards, HDMI external equipments are normally carried out HDMI data transfers with HDMI service equipments.
Further, in HDMI interface compatibility MHL interface, the HDMI service equipments in the present invention can both ensure HDMI Interface realizes MHL interface function, it is also ensured that when HDMI interface realizes HDMI interface function, in the IP moulds of HDMI external equipments The IP modules of block and HDMI service equipments are carried out in the configuration process of HDMI agreements, and control HDMI external equipments are without HDMI numbers According to transmission, furthermore achieved that while HDMI interface compatibility MHL interface is ensured, reduce the IP moulds in HDMI external equipments The IP modules of block and HDMI service equipments are carried out in the configuration process of HDMI agreements, the generation of HDMI service screen scintillations, Improve the purpose of the viewing experience of user.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used To modify to the technical solution described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic； And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical solution spirit and Scope.

Claims (10)

  1. A kind of 1. HDMI service equipments, it is characterised in that including：HDMI interface, transmission branch, first switch unit, and control Processor；Wherein, the first switch unit includes：First end, second end and control terminal；
    The first end of the transmission branch is connected with the voltage pin of the HDMI interface, the second end of the transmission branch and institute State the hot plug detection HPD pin connections of HDMI interface；
    The first end of the first switch unit is connected with the transmission branch, the second end ground connection of the first switch unit, The control terminal of the first switch unit is connected with the control processor；
    The control processor, for when definite HDMI external equipments access the HDMI service equipments, being opened to described first Close unit and send control signal, and when carrying out HDMI protocol configurations, control the first switch unit to turn on, assisted in HDMI After the completion of view configuration, the first switch unit is controlled to disconnect.
  2. 2. HDMI service equipments according to claim 1, it is characterised in that
    The control processor is also connected with the detection pin of the HDMI interface；
    The control processor, specifically in the first detection signal of the detection pin output of HDMI interface, to described the One switch element sends control signal, to control the conducting and disconnection of the first switch unit；The first detection signal is For indicating that HDMI external equipments access the signal of the HDMI service equipments.
  3. 3. HDMI service equipments according to claim 1, it is characterised in that
    The control processor, specifically for accessing the HDMI service equipments in definite HDMI external equipments, carries out HDMI associations During view configuration, the first signal is sent to the first switch unit, and after the completion of HDMI protocol configurations, to the first switch Unit sends secondary signal；
    The control terminal of the first switch unit, for when receiving the first signal, controlling the of the first switch unit One end is turned on second end；When receiving secondary signal, the first end and second end that control the first switch unit disconnect.
  4. 4. HDMI service equipments according to claim 1, it is characterised in that
    The control processor, specifically for when definite HDMI external equipments access the HDMI service equipments, to described the One switch element sends the first signal of preset duration, and after the first signal of the preset duration is sent, to described first Switch element sends the secondary signal of preset duration；The preset duration sets for the HDMI external equipments with the HDMI services Standby IP modules carry out the time needed for HDMI protocol configurations；
    The control terminal of the first switch unit, for when receiving the first signal, controlling the of the first switch unit One end is turned on second end；When receiving secondary signal, the first end and second end that control the first switch unit disconnect.
  5. 5. HDMI service equipments according to claim 2, it is characterised in that further include：Control unit, second switch list Member, and power branch；The second switch unit includes：First end, second end and control terminal；
    The first end of described control unit is connected with the control terminal of the second switch unit, the control terminal of described control unit with The detection pin connection of the HDMI interface, the second end of described control unit, for being connected with power-supply device；
    One end of the power branch is connected with the first end of the transmission branch, and the other end and the detection of the HDMI interface are drawn Foot connect, for the HDMI interface detection pin output second detection signal when, to the first end of the transmission branch Export predeterminated voltage；The second detection signal is indicated for the signal that MHL external equipments access the HDMI service equipments；
    The first end of the first switch unit be connected with the transmission branch including：
    The first end of the second switch unit is connected with the first end of the transmission branch, and the second of the second switch unit End is connected with the first end of the first switch unit；
    Described control unit, for when the detection pin of the HDMI interface exports the first detection signal, described in control Second switch unit turns on, in the detection pin output of the HDMI interface the second detection signal, control described second Switch element disconnects.
  6. 6. HDMI service equipments according to claim 5, it is characterised in that described control unit includes：First switch mould Block and second switch module；Wherein, first switch module includes first end, second end and control terminal；The second switch module Including first end, second end and control terminal；
    The first end of described control unit be connected with the control terminal of the second switch unit including：
    The first end of the second switch module is connected with the control terminal of the second switch unit；
    The control terminal of described control unit be connected with the detection pin of the HDMI interface including：
    The control terminal of the first switch module is connected with the detection pin of the HDMI interface；
    The second end of described control unit, for be connected with power-supply device including：
    The control terminal of the first end of the first switch module and the second switch module, for connecting with the power-supply device Connect；
    The second end of the second end of the first switch module and the second switch module is grounded.
  7. 7. HDMI service equipments according to claim 6, it is characterised in that the first switch module is metal-oxide-semiconductor；It is described Second switch module is the first bipolar transistor.
  8. 8. HDMI service equipments according to claim 6, it is characterised in that further include：First resistor, with the described first electricity Hinder the second resistance of series connection, 3rd resistor, the 4th resistance and the first capacitance；
    The control terminal of the first switch module be connected with the detection pin of the HDMI interface including：The first switch module Control terminal be connected with the second resistance, the detection pin of the HDMI interface is connected with the first resistor；
    The control terminal of the first end of the first switch module and the second switch module is connected with the 3rd resistor；
    The control terminal of the first end of the first switch module and the second switch module, specifically for passing through the described 3rd electricity Resistance is connected with the power-supply device；
    One end of first capacitance is connected with the control terminal of the second switch module, other end ground connection；
    The first end of the second switch module be connected with the control terminal of the second switch unit including：The second switch mould The first end of block is connected by the 4th resistance with the control terminal of the second switch unit.
  9. 9. HDMI service equipments according to claim 5, it is characterised in that the second switch unit is the second bipolarity Transistor；The first switch unit is the 3rd bipolar transistor.
  10. 10. HDMI service equipments according to claim 5, it is characterised in that further include：5th resistance, the 6th resistance, the Seven resistance and the 8th resistance；Wherein, the 5th resistance is connected with the 6th resistance；
    The first end of the first switch unit be connected with the transmission branch including：
    5th resistance is series between the second end of the second switch unit and the first end of the first switch unit, 6th resistance is series between the first end of the first switch unit and the second end of the transmission branch；
    The control terminal of the first switch unit be connected with the control processor including：
    The control terminal of the first switch unit is connected by the 7th resistance with the control processor；
    The control terminal of the first switch unit, is additionally operable to be connected with power-supply device by the 7th resistance and the 8th resistance.
CN201510325067.7A 2015-06-12 2015-06-12 A kind of HDMI service equipments Active CN104994320B (en)

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CN112202439B (en) * 2020-03-31 2021-09-07 华为技术有限公司 Capacitor isolation circuit, interface module, chip and system

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