CN213906785U - Information source switching control device and display terminal with multi-information source switching function - Google Patents
Information source switching control device and display terminal with multi-information source switching function Download PDFInfo
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- CN213906785U CN213906785U CN202120060999.4U CN202120060999U CN213906785U CN 213906785 U CN213906785 U CN 213906785U CN 202120060999 U CN202120060999 U CN 202120060999U CN 213906785 U CN213906785 U CN 213906785U
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Abstract
The utility model discloses an information source switching control device and have many information sources switching function's display terminal, information source switching control device includes information source extension switch, control circuit and main control chip, and the signal output end of each signal input interface all is connected with main control chip, and a plurality of input ends of information source extension switch are connected with the signal output end of a plurality of signal input interfaces respectively, and its gating signal input end is connected with the information source control end of main control chip, and its output end is connected with the signal input end of main control chip; a plurality of electric signal input ends of the control circuit are respectively connected with electric signal output ends of a plurality of signal input interfaces, control signal input ends of the control circuit are connected with control signal ends of the main control chip, and electric signal output ends of the control circuit are connected with an electric signal receiving end of the main control chip. The signal source switching control device can automatically switch a plurality of paths of signals according to the currently accessed signal input interface so as to output one path of signals.
Description
Technical Field
The utility model relates to an information source switches technical field, especially relates to an information source switches controlling means and has display terminal that many information sources switch function.
Background
Terminal equipment with an interactive display function, such as an intelligent television, an all-in-one education machine, a conference panel and an intelligent display terminal, is usually provided with a plurality of digital audio and video signal source input interfaces, such as HDMI, DP, Type-C, DVI and the like, however, in the actual use process, the situation that the audio and video signal source input interfaces are not enough often occurs, at this time, one audio and video signal source input interface needs to be expanded into more than two for use, and at this time, one path of audio and video signals needs to be selected from a plurality of paths of audio and video signals for output and display. In the traditional technical method, a plurality of audio and video signals are switched through a signal source switch similar to a single-pole multi-throw switch, when only one path of audio and video signals is accessed, the path of signals is selected, if other signals are accessed and correspondingly switched, the current connection is disconnected firstly, and then new signals are accessed again, under the condition of multi-path signal access, the problem of signal compatibility is easily caused by disconnecting and switching the signal source through a software method, the output audio and video signals are disordered and cannot be displayed normally, and therefore the signal source switching cannot be finished smoothly. Therefore, the source switching in the prior art method has the problem that the source switching cannot be smoothly completed.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an information source switching control device aims at solving the problem that the information source switching in the prior art method exists can't be accomplished the information source smoothly and switch.
The embodiment of the utility model provides an information source switching control device, information source switching control device is connected with at least two signal input interfaces, information source switching control device includes information source extension switch, control circuit and main control chip;
the electric signal output end of each signal input interface is connected with the main control chip;
a plurality of input ends of the information source expansion switcher are respectively connected with signal output ends of the plurality of signal input interfaces and used for receiving signals input by a plurality of paths of signal output ends; the gating signal input end of the information source expansion switcher is connected with the information source control end of the main control chip and used for receiving the gating signal output by the information source control end so as to select one path of signal corresponding to the gating signal from multiple paths of signals to output; the output end of the information source expansion switcher is connected with the signal input end of the main control chip and used for outputting one path of signal selected from the multiple paths of signals to the main control chip;
a plurality of electrical signal input ends of the control circuit are respectively connected with electrical signal output ends of the plurality of signal input interfaces and used for receiving electrical signals output by a plurality of paths of electrical signal output ends; the control signal input end of the control circuit is connected with the control signal end of the main control chip and is used for receiving the control signal output by the control signal end so as to select one path of electric signal corresponding to the control signal from the plurality of paths of electric signals to output; and the electric signal output end of the control circuit is connected with the electric signal receiving end of the main control chip and used for outputting one path of electric signal selected from the multiple paths of electric signals to the main control chip.
The signal source switching control device is characterized in that the control circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a triode and a field effect transistor;
one end of the first resistor is used as a control signal input end of the control circuit and is connected with a control signal end of the main control chip, the other end of the first resistor is connected with a base electrode of the triode, an emitting electrode of the triode is grounded, a collecting electrode of the triode is connected with one end of the second resistor, the other end of the second resistor is simultaneously connected with one end of the first capacitor, one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is simultaneously connected with a plurality of electric signal input ends, the other end of the first capacitor, one end of the second capacitor and a source electrode of the field effect tube, the other end of the fourth resistor is simultaneously connected with the other end of the second capacitor and a grid electrode of the field effect tube, and a drain electrode of the field effect tube is used as an electric signal output end of the control circuit.
The information source switching control device is characterized in that the field effect transistor is a P-MOS field effect transistor.
The signal source switching control device is characterized in that the triode is an NPN triode.
The source switching control device is characterized in that a diode is connected in series between each electric signal input end and the third resistor.
The signal source switching control device is characterized in that the number of the electric signal input ends is two, and a first diode and a second diode are respectively connected in series between the two electric signal input ends and the third resistor.
The source switching control device, wherein the source switching control device further comprises a controller;
the controller is connected with the information source switching end of the main control chip and used for sending information source switching information to the main control chip.
The information source switching control device is characterized in that the controller is in wired communication connection with the main control chip.
The information source switching control device is characterized in that the controller is in wireless communication connection with the main control chip.
The embodiment of the utility model provides a still provide a display terminal with many information sources switching function, wherein, display terminal includes foretell information source switching control device and display, main control chip with the display is connected, in order to follow select the signal output all the way that obtains among the multichannel signal extremely the display shows.
The embodiment of the utility model provides an information source switching control device and have many information sources switching function's display terminal, information source switching control device includes information source extension switch, control circuit and main control chip, and the electric signal output of each signal input interface all is connected with main control chip, and a plurality of input ends of information source extension switch are connected with the signal output part of a plurality of signal input interfaces respectively, and its gating signal input end is connected with the information source control end of main control chip, and its output end is connected with the signal input part of main control chip; a plurality of electric signal input ends of the control circuit are respectively connected with electric signal output ends of a plurality of signal input interfaces, control signal input ends of the control circuit are connected with control signal ends of the main control chip, and electric signal output ends of the control circuit are connected with an electric signal receiving end of the main control chip. The signal source switching control device can automatically switch a plurality of paths of signals according to the currently accessed signal input interface so as to output one path of signals, and the problem of signal compatibility in the signal source switching process is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of an overall circuit structure of an information source switching control device according to an embodiment of the present invention;
fig. 2 is a partial circuit structure diagram of the signal source switching control device according to an embodiment of the present invention;
fig. 3 is a partial circuit structure diagram of the signal source switching control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1 to 3, fig. 1 is a schematic diagram of an overall circuit structure of an information source switching control device according to an embodiment of the present invention; fig. 2 is a partial circuit structure diagram of the signal source switching control device according to an embodiment of the present invention; fig. 3 is a partial circuit structure diagram of the signal source switching control device according to an embodiment of the present invention. As shown in the figure, the information source switching control device is connected with at least two signal input interfaces, and comprises an information source expansion switcher 1, a control circuit 2 and a main control chip 3; the electrical signal output end of each signal input interface is connected with the main control chip 3, so that the main control chip 3 can directly receive the electrical signal input by each signal input interface; a plurality of input ends of the information source expansion switcher 1 are respectively connected with signal output ends of a plurality of signal input interfaces and used for receiving signals input by a plurality of signal output ends; the gating signal input end of the information source expansion switcher 1 is connected with the information source control end of the main control chip 3 and used for receiving the gating signal output by the information source control end so as to select one path of signal corresponding to the gating signal from multiple paths of signals to output; the output end of the information source expansion switcher 1 is connected with the signal input end of the main control chip 3 and used for outputting one path of signal selected from the multiple paths of signals to the main control chip 3; a plurality of electrical signal input ends of the control circuit 2 are respectively connected with electrical signal output ends of a plurality of signal input interfaces and used for receiving electrical signals output by a plurality of paths of electrical signal output ends; the control signal input end of the control circuit 2 is connected with the control signal end of the main control chip 3 and is used for receiving the control signal output by the control signal end so as to select one path of electric signal corresponding to the control signal from multiple paths of electric signals to output; the electrical signal output end of the control circuit 2 is connected with the electrical signal receiving end of the main control chip 3, and is used for outputting one path of electrical signal selected from the multiple paths of electrical signals to the main control chip 3. A signal input interface is connected to the signal source switching control device, and a signal output end of the signal input interface is connected to an input end of the signal source expansion switcher 1, and an electrical signal output end of the signal input interface is simultaneously connected to an electrical signal input end of the control circuit 2 and the main control chip 3.
Specifically, for example, if the signal source switching control device is connected to two signal input interfaces, the master signal 3 is connected to the electrical signal output terminal of the signal input interface S1 to receive the electrical signal S1 directly input by the signal input interface S1CThe master control signal 3 is also connected to the electrical signal output terminal of the signal input interface S2 to receive the electrical signal S2 directly input by the signal input interface S2C(ii) a Two input terminals of the source expansion switcher 1 are respectively connected with the signal output terminal of the signal input interface S1 and the signal output terminal of the signal input interface S2, and are used for receiving signals S1 respectively input by the two signal output terminalsDAnd S2DThe gating signal input end of the information source expansion switcher 1 is connected with the information source control end of the main control chip 3 and used for receiving the gating signal S input by the information source control endWAnd selects and gates signal S from two signalsWA corresponding signal SDOutput ofTo the signal input end of the main control chip 3, two electrical signal input ends of the control circuit 2 are respectively connected with the electrical signal output end of the signal input interface S1 and the electrical signal output end of the signal input interface S2, and are used for receiving the electrical signals S1 respectively input by the two signal input interfacesVAnd S2V(ii) a The control signal input end of the control circuit 2 is connected with the control signal end of the main control chip 3 and is used for receiving a control signal D input by the control signal endEAnd selects and controls a signal D from the two electric signalsECorresponding one-path electric signal SUAnd outputting the signal to an electric signal receiving end of the main control chip 3.
In a more specific embodiment, the control circuit 2 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a transistor T1, and a field effect transistor Q1; one end of the first resistor R1 is used as the control signal input end of the control circuit 2 and is connected with the control signal end of the main control chip 3, the other end is connected with the base electrode of the triode T1, the emitter of the transistor T1 is grounded, the collector thereof is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the first capacitor C1, one end of the third resistor R3 and one end of the fourth resistor R4 at the same time, the other end of the third resistor R3 is connected to the electrical signal input terminals, the other end of the first capacitor C1, one end of the second capacitor C2 and the source of the field effect transistor Q1, the other end of the fourth resistor R4 is connected to the other end of the second capacitor C2 and the gate of the fet Q1, and the drain of the fet Q1 is used as the electrical signal output terminal of the control circuit 2. Specifically, the field effect transistor Q1 is a P-MOS field effect transistor. The triode T1 is an NPN type triode.
Taking the signal input interface as an HDMI interface as an example, when the HDMI interface is connected to the information source switching control device, a handshake connection is triggered, when the main control chip 3 receives an electrical signal (HDMI-5V, the electrical signal in the HDMI is 5V) input by the HDMI interface, and the handshake connection is performed, the source device and the main control chip 3 corresponding to the HDMI interface start to read and confirm Extended Display Identification Data (EDID) information of the other party from each other, the handshake connection is completed when the EDID information is confirmed, and the source device corresponding to the HDMI interface outputs an audio/video signal to the main control chip 3.
If only one signal input interface is connected to the signal source switching control device, the electrical signal output end of the signal input interface is simultaneously connected to the electrical signal input end of the control circuit 2 and the main control chip 3, the electrical signal output end of the signal input interface outputs an electrical signal (HDMI-5V) and charges the first capacitor C1 and the second capacitor C2, when the first capacitor C1 and the second capacitor C2 complete charging, the field effect transistor Q1 is switched on, the electrical signal of the signal input interface is switched on by the control circuit 2 and is output to the main control chip 3 from the electrical signal output end of the control circuit 2, and the main control chip receives the electrical signal SUAnd completes the handshake connection.
If a signal input interface is connected to the signal source switching control device and then another new signal input interface is connected, the main control chip 3 can directly obtain the electrical signal S1 simultaneously input by the two signal input interfacesCAnd S2CAt this time, the main control chip 3 sends out a control signal DETo the control circuit 2, control signal DEFor a high level signal, the control circuit 2 receives a control signal DEAnd the transistor T1 is turned on, the field effect transistor Q1 is cut off, and the control circuit 2 outputs the electric signal S to the main control chip 3UAfter the switch is turned off, the control signal input end of the control circuit 2 recovers to the low level, at this time, the triode T1 is cut off, the field effect transistor Q1 is turned on, and the control circuit 2 outputs the electric signal S to the main control chip 3UAnd when the two signals are recovered, the handshake connection can be carried out again, and at the moment, the main control chip 3 can select one signal from the two signals of the two signal input interfaces to output and display.
If two signal input interfaces are connected to the signal source switching control device and one connected signal input interface is removed from the signal source switching control device, the main control chip 3 can acquire the change information of two electric signals changed into one electric signal, and at the moment, the main control chip 3 sends out a control signal DETo the control circuit 2, control signal DEIs one section highLevel signal, control circuit 2 to control signal DEThe specific process of responding is the same as the above process, and finally the information source switching control device can reacquire the remaining path of electric signals and complete the above handshake connection.
In a more specific embodiment, a diode is connected in series between each of the electrical signal inputs and the third resistor R3. Specifically, the signal source switching control device is connected to two signal input interfaces at the same time, the number of the electrical signal input ends is two, and a first diode D1 and a second diode D2 are respectively connected in series between the two electrical signal input ends and the third resistor R3.
In a more specific embodiment, the source switching control apparatus further includes a controller 4; the controller 4 is connected with the information source switching end of the main control chip 3, and the controller 4 is used for sending information source switching information to the main control chip 3, that is, a user can send a control signal by using the controller 4 to switch and output and display a plurality of signals input by the plurality of signal input interfaces. The controller 4 establishes a wired communication connection with the main control chip 3; the controller 4 may establish a wireless communication connection with the main control chip 3. Specifically, the controller 4 may be a mouse, a keyboard, a control switch, or the like that establishes a wired communication connection with the main control chip 3, or may also be a wireless controller that establishes a wireless communication connection with the main control chip 3, such as a wireless mouse, a remote controller, a mobile phone, or a tablet computer, and the wireless communication connection may be a bluetooth communication connection, a 3G communication connection, a 4G communication connection, or a 5G communication connection.
The embodiment of the utility model provides an in still provide a display terminal with many information sources switching function, wherein, display terminal includes foretell information source switching control device and display, main control chip 3 with the display is connected, in order to follow select in the multichannel signal obtained signal output all the way extremely the display shows.
The embodiment of the utility model provides an information source switching control device and have many information sources switching function's display terminal, information source switching control device includes information source extension switch, control circuit and main control chip, the electric signal output part of each signal input interface all is connected with main control chip, a plurality of input ends of information source extension switch are connected with the signal output part of a plurality of signal input interfaces respectively, its gating signal input end is connected with main control chip's information source control end, its output with main control chip's signal input end is connected; a plurality of electric signal input ends of the control circuit are respectively connected with electric signal output ends of a plurality of signal input interfaces, control signal input ends of the control circuit are connected with control signal ends of the main control chip, and electric signal output ends of the control circuit are connected with an electric signal receiving end of the main control chip. The signal source switching control device can automatically switch a plurality of paths of signals according to the currently accessed signal input interface so as to output one path of signals, and the problem of signal compatibility in the signal source switching process is avoided.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within 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. The information source switching control device is characterized in that the information source switching control device is connected with at least two signal input interfaces and comprises an information source expansion switcher, a control circuit and a main control chip;
the electric signal output end of each signal input interface is connected with the main control chip;
a plurality of input ends of the information source expansion switcher are respectively connected with signal output ends of the plurality of signal input interfaces and used for receiving signals input by a plurality of paths of signal output ends; the gating signal input end of the information source expansion switcher is connected with the information source control end of the main control chip and used for receiving the gating signal output by the information source control end so as to select one path of signal corresponding to the gating signal from multiple paths of signals to output; the output end of the information source expansion switcher is connected with the signal input end of the main control chip and used for outputting one path of signal selected from the multiple paths of signals to the main control chip;
a plurality of electrical signal input ends of the control circuit are respectively connected with electrical signal output ends of the plurality of signal input interfaces and used for receiving electrical signals output by a plurality of paths of electrical signal output ends; the control signal input end of the control circuit is connected with the control signal end of the main control chip and is used for receiving the control signal output by the control signal end so as to select one path of electric signal corresponding to the control signal from the plurality of paths of electric signals to output; and the electric signal output end of the control circuit is connected with the electric signal receiving end of the main control chip and used for outputting one path of electric signal selected from the multiple paths of electric signals to the main control chip.
2. The source switching control device according to claim 1, wherein the control circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a triode, and a field effect transistor;
one end of the first resistor is used as a control signal input end of the control circuit and is connected with a control signal end of the main control chip, the other end of the first resistor is connected with a base electrode of the triode, an emitting electrode of the triode is grounded, a collecting electrode of the triode is connected with one end of the second resistor, the other end of the second resistor is simultaneously connected with one end of the first capacitor, one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is simultaneously connected with a plurality of electric signal input ends, the other end of the first capacitor, one end of the second capacitor and a source electrode of the field effect tube, the other end of the fourth resistor is simultaneously connected with the other end of the second capacitor and a grid electrode of the field effect tube, and a drain electrode of the field effect tube is used as an electric signal output end of the control circuit.
3. The device as claimed in claim 2, wherein the fet is a P-MOS fet.
4. The device as claimed in claim 2, wherein the transistor is an NPN transistor.
5. The source switching control device according to any of claims 2-4, wherein a diode is connected in series between each of the electrical signal input terminals and the third resistor.
6. The source switching control device according to claim 5, wherein there are two electrical signal input terminals, and a first diode and a second diode are respectively connected in series between the two electrical signal input terminals and the third resistor.
7. The source switching control device according to claim 5, wherein the source switching control device further comprises a controller;
the controller is connected with the information source switching end of the main control chip and used for sending information source switching information to the main control chip.
8. The device according to claim 7, wherein the controller establishes a wired communication connection with the host chip.
9. The device according to claim 7, wherein the controller establishes a wireless communication connection with the host chip.
10. A display terminal with multi-source switching function, wherein the display terminal comprises the source switching control device and the display as claimed in any one of claims 1 to 9, and the main control chip is connected to the display to output one signal selected from the multiple signals to the display for displaying.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120060999.4U CN213906785U (en) | 2021-01-11 | 2021-01-11 | Information source switching control device and display terminal with multi-information source switching function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120060999.4U CN213906785U (en) | 2021-01-11 | 2021-01-11 | Information source switching control device and display terminal with multi-information source switching function |
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| CN213906785U true CN213906785U (en) | 2021-08-06 |
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| CN202120060999.4U Active CN213906785U (en) | 2021-01-11 | 2021-01-11 | Information source switching control device and display terminal with multi-information source switching function |
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