A conversion circuit and electronic device

Abstract

The embodiment of the application discloses a conversion circuit, comprising a first input end of a first sub-circuit, a first input end of a second sub-circuit and a first input end of a third sub-circuit, all used for connecting an external voltage terminal; a second input end of the first sub-circuit and a second input end of the third sub-circuit are both used for accessing an original driving signal sent by a first display device; a first output end of the third sub-circuit is connected with the second input end of the second sub-circuit, used for outputting a signal meeting voltage demand to the second sub-circuit according to the state of the external voltage terminal providing external voltage; the first sub-circuit is only turned on when accessing external voltage from the external voltage terminal, and outputs a second driving signal to a second display device through the first output end; the second sub-circuit only outputs the first driving signal received from the third sub-circuit through the first output end when not accessing external voltage from the external voltage terminal, which can solve the technical problem of resource waste and improve the utilization rate of the original driving signal.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of conversion circuit, in particular to a conversion circuit and a converter. BACKGROUND

[0002] There are many communication interfaces for display screens, among which commonly used interfaces include LVDS (Low Voltage Differential Signaling), RGB, eDP (Embedded DisplayPort), etc. Among them, the eDP interface has been widely used in industrial computers and industrial tablet computers due to its high transmission efficiency, and the eDP interface is rapidly becoming a mainstream interface.

[0003] When a small screen is used to drive a large screen through an eDP interface, the required power supply requirements are different due to the inconsistency of the screen size. Usually, external power supply is used to realize that a small screen lights up a large screen through an eDP interface. This direct external power supply method makes the internal drive voltage of the small screen unable to be utilized, thereby causing resource waste. SUMMARY

[0004] Embodiments of the present application provide a conversion circuit and an electronic device, which can solve the technical problem of resource waste, improve the utilization rate of the original drive signal, and reduce resource waste.

[0005] Embodiments of the present application provide a conversion circuit, which comprises a first sub-circuit, a second sub-circuit and a third sub-circuit.

[0006] The first input end of the first sub-circuit, the first input end of the second sub-circuit and the first input end of the third sub-circuit are all used to connect an external voltage terminal;

[0007] The second input end of the first sub-circuit and the second input end of the third sub-circuit are both used to input an original drive signal sent by a first display device;

[0008] The first output end of the third sub-circuit is connected with the second input end of the second sub-circuit, for outputting a signal meeting voltage requirements to the second sub-circuit according to the state of the external voltage terminal providing external voltage, the signal being the external voltage or a first drive signal obtained by boosting the original drive signal;

[0009] The first sub-circuit is only turned on when the external voltage is connected from the external voltage terminal, generates a second driving signal meeting the voltage requirement based on the original driving signal and the external voltage, and outputs the second driving signal to the second display device through the first output terminal of the first sub-circuit; the second sub-circuit is only turned on when the external voltage is not connected from the external voltage terminal, and outputs the first driving signal received from the third sub-circuit through the first output terminal of the second sub-circuit, so that the driving signal meeting the voltage requirement required by the second display device is maintained through the first output terminal of the first sub-circuit and the first output terminal of the second sub-circuit.

[0010] The embodiment of the present application also provides an electronic device, comprising a first display device, a second display device and the conversion circuit.

[0011] The first display device is connected with the second display device through the conversion circuit.

[0012] The embodiment of the present application outputs the external voltage meeting the voltage requirement or the first driving signal obtained by boosting the original driving signal to the second sub-circuit according to the state of the external voltage provided by the external voltage terminal through the third sub-circuit, the second sub-circuit is only turned on when the external voltage is not connected from the external voltage terminal, and outputs the first driving signal received from the third sub-circuit through the first output terminal of the second sub-circuit, so that the technical problem of resource waste caused by the fact that the voltage of the original driving signal cannot be utilized is solved, the utilization rate of the original driving signal is improved, and resource waste is reduced. In addition, the first sub-circuit is only turned on when the external voltage is connected from the external voltage terminal, a second driving signal meeting the voltage requirement is generated based on the original driving signal and the external voltage, and the second driving signal is output to the second display device through the first output terminal of the first sub-circuit, so that the voltage of the original driving signal can be utilized, and the external voltage can also be used for driving signal transmission on the basis of realizing the voltage utilization of the original driving signal, and the functional diversity is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a first schematic diagram of a conversion circuit provided by the embodiment of the present application;

[0014] Figure 2 is a schematic diagram of a first sub-circuit provided by the embodiment of the present application;

[0015] Figure 3 is a schematic diagram of a third sub-circuit provided by the embodiment of the present application;

[0016] Figure 4 is a schematic diagram of a second sub-circuit provided by the embodiment of the present application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0018] When the small screen is used to light up the large screen through the eDP interface, the required power supply requirements are different due to the inconsistency of the screen size. Usually, external power supply is used to realize that the small screen lights up the large screen through the eDP interface. This direct external power supply method makes the internal drive voltage of the small screen cannot be utilized, thereby causing resource waste. In addition, using external power supply requires the use of excess wires and adapter plates to realize the adapter function, resulting in increased production cost; at the same time, too many wires can cause the whole machine to be messy, and the product design requirement is high.

[0019] Only through external power supply, an external power supply is needed, which is not allowed in some scenarios, resulting in the inability to use the corresponding circuit conversion function. Only through external power supply, the timing of the power supply and data cannot be controlled, and problems such as no display or screen flicker are prone to occur.

[0020] Therefore, in order to solve the technical problem of resource waste caused by the fact that the voltage of the original drive signal cannot be utilized, the embodiment of the present application provides a conversion circuit. Figure 1 is a first schematic diagram of a conversion circuit provided by the embodiment of the present application, referring to Figure 1 The conversion circuit 1 includes a first sub-circuit 11, a second sub-circuit 12 and a third sub-circuit 13. The first input end of the first sub-circuit 11, the first input end of the second sub-circuit 12 and the first input end of the third sub-circuit 13 are all used to connect an external voltage terminal. The external voltage terminal is used to selectively access an external voltage, which is a voltage that meets the voltage requirement and does not contain corresponding data timing information. Among them, meeting the voltage requirement can be understood as meeting the voltage value requirement, for example, assuming that the voltage requirement is to require a voltage value of 12V, the voltage value of the accessed external voltage should be 12V, so that the external voltage meets the voltage requirement. The second input end of the first sub-circuit 11 and the second input end of the third sub-circuit 13 are both used to access the original drive signal sent by the first display device. The original drive signal can be understood as a drive voltage signal including corresponding data timing information. The first display device can be understood as a display device whose internal drive module can send the original drive signal. The original drive signal is output by the drive module of the first display device to the second input end of the first sub-circuit 11 and the second input end of the third sub-circuit 13. It should be noted that the original drive signal includes a drive voltage and a data timing signal, and the drive module in the first display device is equivalent to a signal source. For example, the original drive signal can be a 10V eDP signal.

[0021] The first output end of the third sub-circuit 13 is connected with the second input end of the second sub-circuit 12, for outputting a signal to the second sub-circuit 12 according to the state of the external voltage provided by the external voltage terminal, the signal being the external voltage or the first driving signal obtained by boosting the original driving signal to meet the voltage requirement. Wherein, meeting the voltage requirement can be understood as meeting the voltage value requirement. The first driving signal meeting the voltage value requirement is obtained by boosting the original driving signal. It should be noted that the original driving signal and the first driving signal are only different in voltage value, and the corresponding data timing information is the same. When the first input end of the third sub-circuit 13 is connected with the external voltage through the external voltage terminal, the first output end of the third sub-circuit 13 outputs the external voltage to the second sub-circuit 12. When the first input end of the third sub-circuit 13 is not connected with the external voltage through the external voltage terminal, the second input end of the third sub-circuit 13 is connected with the original driving signal sent by the first display device, then the third sub-circuit 13 boosts the original driving signal to obtain the first driving signal meeting the voltage requirement, and outputs the first driving signal to the second input end of the second sub-circuit 12 through the first output end of the third sub-circuit 13.

[0022] The first sub-circuit 11 is only turned on when the external voltage is connected through the external voltage terminal, generates the second driving signal meeting the voltage requirement based on the original driving signal and the external voltage, and outputs the second driving signal to the second display device through the first output end. Wherein, meeting the voltage requirement can be understood as meeting the voltage value requirement. The external voltage is the voltage meeting the voltage value requirement, so the second driving signal meeting the voltage value requirement can be generated based on the original driving signal and the external voltage. It should be noted that the original driving signal and the second driving signal are only different in voltage value, and the corresponding data timing information is the same. When the first input end of the first sub-circuit 11 is connected with the external voltage through the external voltage terminal, the second input end of the first sub-circuit 11 is used to connect with the original driving signal sent by the first display device, the first sub-circuit 11 generates the second driving signal meeting the voltage requirement based on the original driving signal and the external voltage, and outputs the second driving signal to the second display device through the first output end, so that the second display device performs screen lighting and displays corresponding content according to the second driving signal. When the first input end of the first sub-circuit 11 is not connected with the external voltage through the external voltage terminal, the first sub-circuit 11 is not turned on, and the transmission of the driving signal is performed by the third sub-circuit 13 and the second sub-circuit 12.

[0023] The second sub-circuit 12 is only turned on when no external voltage is connected from the external voltage terminal, and outputs the first driving signal received from the third sub-circuit 13 through the first output end thereof. As known from the foregoing, when no external voltage is connected from the external voltage terminal to the first input end of the third sub-circuit 13, the original driving signal transmitted by the first display device is connected to the second input end of the third sub-circuit 13, and then the third sub-circuit 13 performs voltage boosting on the original driving signal to obtain the first driving signal meeting the voltage requirement, and outputs the first driving signal to the second input end of the second sub-circuit 12 through the first output end of the third sub-circuit 13. The second sub-circuit 12 transmits the first driving signal received from the first output end of the third sub-circuit 13 to the second display device, so that the second display device can perform screen lighting and display corresponding content according to the first driving signal.

[0024] It should be noted that the driving signal meeting the voltage requirement required by the second display device is maintained through the first output end of the first sub-circuit and the first output end of the second sub-circuit. The first sub-circuit is only turned on when the external voltage is connected from the external voltage terminal, generates the second driving signal meeting the voltage requirement based on the original driving signal and the external voltage, and outputs the second driving signal to the second display device through the first output end thereof. The second sub-circuit is only turned on when no external voltage is connected from the external voltage terminal, and outputs the first driving signal received from the third sub-circuit through the first output end thereof.

[0025] The embodiments of the present application can utilize the original driving signal transmitted by the first display device to obtain the first driving signal or the second driving signal meeting the voltage requirement through the cooperation of the first sub-circuit 11, the second sub-circuit 12 and the third sub-circuit 13, and transmit the first driving signal or the second driving signal to the second display device, so that the second display device can perform screen lighting and display corresponding content according to the driving signal (the first driving signal or the second driving signal), improve the utilization rate of the original driving signal, and thus reduce resource waste.

[0026] Figure 2 is a schematic diagram of the first sub-circuit provided by the embodiments of the present application, with reference to Figure 2The first sub-circuit 11 includes a first switch module 111, a first slow start module 112, a first capacitor C1 and a second switch module 113. The first end of the first switch module 111 is used to access the original driving signal sent by the first display device. The second end of the first switch module 111 is connected with the first end of the first slow start module 112. The third end of the first switch module 111 is grounded. The second end of the first slow start module 112 is connected with the first end of the second switch module 113. The third end of the first slow start module 112 is connected with the second end of the second switch module 113 and the first end of the first capacitor C1. The second end of the first slow start module 112 is used to connect an external voltage terminal. The second end and the third end of the first switch module 111 are turned on only when the external voltage terminal accesses the external voltage. When the second end and the third end of the first switch module 111 are turned on, the second end of the first switch module 111 is used to output a data timing signal to the second switch module 113 based on the original driving signal, so as to control the timing of the second switch module 113. The second end of the first capacitor C1 is connected with the third end of the second switch module 113. The second switch module 113 is used to turn on the first end and the third end of the second switch module 113 only when the external voltage terminal accesses the external voltage. The third end of the second switch module 113 is used to send a second driving signal meeting the voltage requirement to the second display device when the first end and the third end of the second switch module 113 are turned on. When the first end and the third end of the second switch module 113 are turned on, the first end of the second switch module 113 accesses the external voltage, but this external voltage does not have timing information. Therefore, when the second end and the third end of the first switch module 111 are turned on, the second end of the first switch module 111 is used to output a data timing signal (i.e. data timing information) to the second switch module 113 based on the original driving signal, so that the second switch module 113 obtains the timing information of the original driving signal. The second switch module 113 combines the external voltage and the timing information to obtain the second driving signal meeting the voltage requirement.

[0027] It should be noted that the voltage value of the external voltage meets the voltage requirement, and the voltage value of the second driving signal obtained by the second switch module 113 combining the external voltage and the timing information also meets the voltage requirement. For example, the external voltage can be 12V, and the second display device can be a display device that needs 12V voltage to light up.

[0028] For example, the external voltage can be 12V, and the original driving signal can be a 10V eDP signal. Then the first driving signal or the second driving signal meeting the voltage requirement obtained above is a 12V eDP signal.

[0029] It should be noted that the first driving signal and the second driving signal are theoretically the same driving signal. The terms "first" and "second" are only used to distinguish the sources of the signals.

[0030] It should be noted that when the external voltage terminal is not connected to the external voltage, the first switch module 111 and the second switch module 113 are both in an open circuit state, so that no signal is output from the third end of the second switch module 113 of the second switch module 113.

[0031] In an embodiment, referring to Figure 1 , the first switch module 111 includes a first resistor R1, a second resistor R2, and a first triode Q1. The first end of the first resistor R1 is used to connect the original driving signal sent by the first display device, and the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the base of the first triode Q1. The second end of the second resistor R2 is connected with the emitter of the first triode Q1, and the emitter of the first triode Q1 is grounded. The collector of the first triode Q1 is connected with the first end of the first slow start module 112. It should be noted that the first triode Q1 is an NPN type triode.

[0032] In an embodiment, the first slow start module 112 includes a third resistor R3, a fourth resistor R4, a first diode D1, and a second capacitor C2. The first end of the third resistor R3 is connected with the collector of the first triode Q1, the first end of the fourth resistor R4, and the anode of the first diode D1. The second end of the third resistor R3 is connected with the first end of the second capacitor C2 and the first end of the second switch module 113, and the second end of the third resistor R3 is used to connect the external voltage terminal. The second end of the fourth resistor R4 is connected with the second end of the second capacitor C2, the cathode of the first diode D1, the second end of the second switch module 113, and the first end of the second capacitor C2. The first slow start module 112 can prevent jitter delay power-on and control the rising slope and amplitude of the input current, thereby maintaining the transmission stability of the circuit.

[0033] In an embodiment, the second switch module 113 is a first MOS tube QD1. The source of the first MOS tube QD1 is connected with the first end of the second capacitor C2. The gate of the first MOS tube QD1 is connected with the cathode of the first diode D1. The drain of the first MOS tube QD1 is connected with the second end of the first capacitor C1, and the drain of the first MOS tube QD1 is used to send the second driving signal meeting the voltage requirement to the second display device when turned on.

[0034] When the external voltage terminal is not connected to the external voltage, the source of the first MOS tube QD1 in the first sub-circuit 11 has no input source, so the first sub-circuit 11 is not turned on. When the external voltage terminal is connected to the external voltage, the source of the first MOS tube QD1 in the first sub-circuit 11 inputs the source, and the first triode Q1 is turned on, the conduction of the first MOS tube QD1 is controlled by the original drive signal, and the original timing information is retained. The first MOS tube QD1 combines the external voltage and the original timing information of the drive signal to obtain the second drive signal that meets the voltage requirement, so that the drain of the first MOS tube QD1 can send the second drive signal that meets the voltage requirement to the second display device. Through the circuit design of the first sub-circuit 11, the second drive signal that meets the voltage requirement can be output to the second display device when the external voltage is connected, so that the second display device can light up the screen and display the corresponding content according to the second drive signal.

[0035] Figure 3 is a schematic diagram of the third sub-circuit provided by the embodiment of the present application, referring to Figure 3The third sub-circuit 13 comprises a third switch module 131, a fifth resistor R5, a voltage boosting chip U1, a first filter module 132, a second filter module 133, a first inductor L1, a second diode D2, a sixth resistor R6 and a seventh resistor R7. The first end of the third switch module 131 is used for connecting an external voltage terminal. The second end of the third switch module 131 is connected with the enable pin EN of the voltage boosting chip U1 and the first end of the fifth resistor R5. The third end of the third switch module 131 is grounded. The second end and the third end of the third switch module 131 are turned on only when the external voltage terminal is connected with an external voltage. Based on the turn-on of the second end and the third end of the third switch module 131, the enable pin EN of the voltage boosting chip U1 is pulled low, so that the voltage boosting chip U1 cannot work. The second end of the fifth resistor R5 is connected with the first end of the first filter module 132, the first end of the first inductor L1 and the voltage input pin IN of the voltage boosting chip U1. The first end of the first filter module 132 is used for connecting with the original driving signal sent by the first display device. The second end of the first filter module 132 is grounded. The second end of the first inductor L1 is connected with the anode of the second diode D2 and the switch control pin SW of the voltage boosting chip U1. The cathode of the second diode D2 is connected with the first end of the sixth resistor R6, the first end of the second filter module 133 and the second end of the second sub-circuit 12. The second end of the sixth resistor R6 is connected with the voltage feedback pin FB of the voltage boosting chip U1 and the first end of the seventh resistor R7. The second end of the seventh resistor R7 is connected with the ground pin of the voltage boosting chip U1. The voltage boosting chip U1 works only when the external voltage terminal is not connected with the external voltage. The second end of the second filter module 133 is grounded.

[0036] In an embodiment, the third switch module 131 comprises an eighth resistor R8, a ninth resistor R9 and a second triode Q2. The first end of the eighth resistor R8 is used to connect the external voltage terminal, and the second end of the eighth resistor R8 is connected with the first end of the ninth resistor R9 and the base of the second triode Q2. The second end of the ninth resistor R9 is connected with the emitter of the second triode Q2, and the emitter of the second triode Q2 is grounded. The collector of the second triode Q2 is connected with the first end of the fifth resistor R5. It should be noted that the second triode Q2 is an NPN triode. When the external voltage terminal is connected with the external voltage, the base of the second triode Q2 has the external voltage, at this time, the collector of the second triode Q2 is connected with the original driving signal, so that the second triode Q2 is in the on state, at this time, the enable pin EN of the boost chip U1 is pulled down, so that the boost chip U1 cannot work, so that no signal (current) is transmitted to the second input end of the second sub-circuit 12.

[0037] In an embodiment, the first filter module 132 comprises at least one third capacitor C3. The first end of the third capacitor C3 is connected with the first end of the first inductor L1, and the first end of the third capacitor C3 is used to connect the original driving signal transmitted by the first display device. The second end of the third capacitor C3 is grounded. It should be noted that the specific data amount of the third capacitor C3 can be set according to the actual situation, and a corresponding number of third capacitors C3 can be set according to the actual filtering requirement. The original driving signal is filtered by the first filter module 132, so that the filtered signal is more stable, thereby playing a role in protecting the circuit.

[0038] In an embodiment, the second filter module 133 comprises at least one fourth capacitor C4 and a first electrolytic capacitor EA1. The first end of the fourth capacitor C4 is connected with the cathode of the second diode D2, the positive electrode of the first electrolytic capacitor EA1 and the second input end of the second sub-circuit 12. The second end of the fourth capacitor C4 and the negative electrode of the first electrolytic capacitor EA1 are grounded. It should be noted that the specific number of the fourth capacitor C4 can be set according to the actual situation, and a corresponding number of fourth capacitors C4 can be set according to the actual filtering requirement. The second filter module 133 is filtered, so that the filtered output signal is more stable, thereby playing a role in protecting the circuit.

[0039] Figure 4 is a schematic diagram of the second sub-circuit provided by the embodiment of the application, referring to Figure 4The second sub-circuit 12 comprises a fourth switch module 121, a second slow start module 122, a fifth switch module 123 and a fifth capacitor C5. The first end of the fourth switch module 121 is used for connecting the external voltage terminal, the second end of the fourth switch module 121 is connected with the first end of the second slow start module 122, the third end of the fourth switch module 121 is grounded, and the second end and the third end of the fourth switch module 121 are conductive only when the external voltage terminal is not connected with the external voltage. The second end of the second slow start module 122 is connected with the first end of the fifth switch module 123, and the second end of the second slow start module 122 is connected with the first output end of the third sub-circuit 13. The third end of the second slow start module 122 is connected with the second end of the fifth switch module 123 and the first end of the fifth capacitor C5. The third end of the fifth switch module 123 is connected with the second end of the fifth capacitor C5, and the third end of the fifth switch module 123 is used for connecting the second display device. The first end and the third end of the fifth switch module 123 are conductive only when the external voltage terminal is not connected with the external voltage, and the third end of the fifth switch module 123 is used for sending the first driving signal received from the third sub-circuit 13 to the second display device. Based on the above third sub-circuit 13, when the external voltage terminal is not connected with the external voltage, the third switch module 131 has no input source and is not conductive, and the boost chip U1 performs boost work to output the first driving signal meeting the voltage requirement to the second diode D2, and then outputs the second driving signal meeting the voltage requirement to the second input end of the second sub-circuit 12. Thus, when the external voltage terminal is not connected with the external voltage, the second sub-circuit 12 receives the first driving signal meeting the voltage requirement sent by the third sub-circuit 13 through the first end of the fifth switch module 123. Based on the fact that the first end and the third end of the fifth switch module 123 are conductive at this time, the first driving signal meeting the voltage requirement can be sent to the second display device through the third end of the fifth switch module 123, so as to realize that the original driving signal is used as the signal source to provide the first driving signal meeting the voltage requirement to the second display device. Through the circuit design of the third sub-circuit 13 and the second sub-circuit 12, the original driving signal can be used as the signal source to provide the first driving signal meeting the voltage requirement to the second display device, the utilization rate of the original driving signal is improved, and resource waste is reduced.

[0040] In one embodiment, with reference to Figure 3 and Figure 4The fourth switch module 121 includes a tenth resistor R10, an eleventh resistor R11 and a third triode Q3. The first end of the tenth resistor R10 is used for connecting the external voltage terminal, and the second end of the tenth resistor R10 is connected with the first end of the eleventh resistor R11 and the base of the third triode Q3. The second end of the eleventh resistor R11 is connected with the collector of the third triode Q3, and the collector of the third triode Q3 is grounded. The emitter of the third triode Q3 is connected with the first end of the second slow start module 122. It should be noted that the third triode Q3 is a PNP type triode. When the external voltage terminal is not connected with the external voltage, based on the third sub-circuit 13 described above, when the external voltage terminal is not connected with the external voltage, the third switch module 131 has no input source, and thus is not turned on, and the boost chip U1 performs the boost work to output the first driving signal meeting the voltage requirement to the second diode D2, and then output the first driving signal meeting the voltage requirement to the second input end of the second sub-circuit 12, i.e., the emitter of the third triode Q3 has a voltage signal, and thus the third triode Q3 is turned on. When the external voltage terminal is connected with the external voltage, the base of the second triode Q2 has the external voltage, at this time, the collector of the second triode Q2 is connected with the original driving signal, and thus the second triode Q2 is in the turned-on state, at this time, the enable pin EN of the boost chip U1 is pulled low, so that the boost chip U1 cannot work, and thus no signal (current) is transmitted to the second input end of the second sub-circuit 12, i.e., the third triode Q3 is in the cut-off state.

[0041] In an embodiment, the second slow start module 122 includes a twelfth resistor R12, a thirteenth resistor R13, a sixth capacitor C6 and a third diode D3. The first end of the twelfth resistor R12 is connected with the emitter of the third triode Q3, the first end of the thirteenth resistor R13 and the anode of the third diode D3. The second end of the twelfth resistor R12 is connected with the first end of the fifth switch module 123 and the first output end of the third sub-circuit 13. The second end of the twelfth resistor R12 is connected with the second end of the fifth switch module 123 and the first end of the fifth capacitor C5. The second slow start module 122 can prevent the jitter delay power-on and control the rising slope and amplitude of the input current, so as to maintain the transmission stability of the circuit.

[0042] In an embodiment, the fifth switch module 123 comprises a second MOS tube QD2 and a third MOS tube QD3. The source of the second MOS tube QD2 is connected with the second end of the twelfth resistor R12, the gate of the second MOS tube QD2 is connected with the cathode of the third diode D3 and the gate of the third MOS tube QD3, and the drain of the second MOS tube QD2 is connected with the drain of the third MOS tube QD3. The source of the third MOS tube QD3 is connected with the second end of the fifth capacitor C5, and the source of the third MOS tube QD3 is connected with the second display device, for sending the first driving signal received from the third sub-circuit 13 to the second display device when conducting. As known from the above, when the external voltage terminal is not connected with the external voltage, the third sub-circuit 13 outputs the first driving signal meeting the voltage requirement to the second input end of the second sub-circuit 12, and the third diode Q3 is conducting, so that the gates of the second MOS tube QD2 and the third MOS tube QD3 are low to the ground, so that the second MOS tube QD2 and the third MOS tube QD3 are conducting, so that the source of the second MOS tube QD2 can transmit the first driving signal meeting the voltage requirement received from the third sub-circuit 13 to the drain of the third MOS tube QD3 through the drain of the second MOS tube QD2, and then the drain of the third MOS tube QD3 can send the first driving signal received from the third sub-circuit 13 to the second display device. When the external voltage terminal is connected with the external voltage, as known from the above, the third sub-circuit 13 has no signal (current) transmission to the second input end of the second sub-circuit 12, so that the third diode Q3 is in the off state, and the gates of the second MOS tube QD2 and the third MOS tube QD3 are pulled up to the same voltage as the input, so that the second MOS tube QD2 and the third MOS tube QD3 cannot conduct. In addition, the circuit composed of the second sub-circuit 12 and the third sub-circuit 13 is not conducting, only the first sub-circuit 11 is conducting.

[0043] When the external voltage terminal is connected with the external voltage, as known from the above, the third sub-circuit 13 has no signal (current) transmission to the second input end of the second sub-circuit 12, so that the third diode Q3 is in the off state, and the gates of the second MOS tube QD2 and the third MOS tube QD3 are pulled up to the same voltage as the input, so that the second MOS tube QD2 and the third MOS tube QD3 cannot conduct. In addition, the circuit composed of the second sub-circuit 12 and the third sub-circuit 13 is not conducting, only the first sub-circuit 11 is conducting. At this time, only the first sub-circuit 11 outputs the second driving signal meeting the voltage requirement to the second display device, realizing that the external power supply provides the voltage signal, and the original driving signal provides the timing information, realizing that the external voltage and the original driving signal are converted into the corresponding second driving signal meeting the voltage requirement to the second display device.

[0044] When the external voltage terminal is not connected to the external voltage, the entire circuit is powered by the original driving signal. As previously mentioned, when the external voltage terminal is not connected to the external voltage, the third sub-circuit 13 outputs the first driving signal meeting the voltage requirement to the second input terminal of the second sub-circuit 12, and the third diode Q3 is turned on, so that the gates of the second MOS tube QD2 and the third MOS tube QD3 are low to the ground, causing the second MOS tube QD2 and the third MOS tube QD3 to be turned on, so that the source of the second MOS tube QD2 receives the first driving signal meeting the voltage requirement from the third sub-circuit 13, which can be transmitted to the drain of the third MOS tube QD3 through the drain of the second MOS tube QD2, and then the drain of the third MOS tube QD3 can send the first driving signal received from the third sub-circuit 13 to the second display device.

[0045] As mentioned above, the third sub-circuit 13 outputs the external voltage meeting the voltage requirement or the first driving signal obtained by boosting the original driving signal to the second sub-circuit 12 according to the state of the external voltage provided by the external voltage terminal, and the second sub-circuit 12 is only turned on when the external voltage is not connected to the external voltage terminal, and outputs the first driving signal obtained by boosting the original driving signal received from the third sub-circuit 13 through the first output terminal, which solves the technical problem of resource waste caused by the fact that the voltage of the original driving signal cannot be utilized, improves the utilization rate of the original driving signal, and thus reduces resource waste. In addition, the first sub-circuit 11 is only turned on when the external voltage is connected to the external voltage terminal, generates the second driving signal meeting the voltage requirement based on the original driving signal and the external voltage, and outputs it to the second display device through the first output terminal, which not only realizes the utilization of the voltage of the original driving signal, but also uses the external voltage to transmit the driving signal, improving the functional diversity.

[0046] The electronic device provided by the embodiment of the present application comprises a first display device, a second display device and the conversion circuit, wherein the first display device is connected with the second display device through the conversion circuit. The conversion circuit is connected with the driving module of the first display device to receive the original driving signal sent by the driving module of the first display device. The first display device can be an eDP display screen with an original driving voltage of 10V. The second display device can be an eDP display screen with a voltage requirement of 12V. The second display device is only a display device, and needs other devices (for example, the first display device) to provide corresponding driving signals (signals containing corresponding voltage values and data timing information) to display corresponding content. By connecting the first display device with the second display device through the conversion circuit, the original driving signal of the first display device can be converted to obtain the first driving signal meeting the voltage requirement of the second display device through the above-mentioned embodiment, so that the second display device can be lit and display corresponding content according to the first driving signal, so that the original driving signal of the first display device is utilized, and the resource utilization rate is improved. In addition, through the above-mentioned embodiment, when the external voltage is connected, the second driving signal meeting the voltage requirement of the second display device can also be converted according to the external voltage combined with the timing information of the original driving signal, so that the second display device can be lit and display corresponding content according to the second driving signal, and the functional diversity of the electronic device is improved.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense, for example, they can be fixedly connected, or detachably connected, or integrated; they can be mechanically connected, directly connected, or indirectly connected through an intermediate medium, or the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0049] In addition, the terms "first", "second", etc. are used only to describe the purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited and defined.

[0050] It should be noted that in the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0051] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change according to the technical solution and the concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A conversion circuit, characterized by, The first sub-circuit, the second sub-circuit and the third sub-circuit are connected to an external voltage terminal; The first input terminal of the first sub-circuit, the first input terminal of the second sub-circuit and the first input terminal of the third sub-circuit are connected to the external voltage terminal; The second input terminal of the first sub-circuit and the second input terminal of the third sub-circuit are connected to the original driving signal transmitted by the first display device; The first output terminal of the third sub-circuit is connected to the second input terminal of the second sub-circuit, and the third sub-circuit outputs a signal to the second sub-circuit according to the state of the external voltage terminal, wherein the signal is the external voltage or a first driving signal obtained by boosting the original driving signal to meet the voltage requirement; The first sub-circuit is turned on only when the external voltage terminal is connected to the external voltage, and generates a second driving signal meeting the voltage requirement based on the original driving signal and the external voltage, and outputs the second driving signal to the second display device through the first output terminal of the first sub-circuit; the second sub-circuit is turned on only when the external voltage terminal is not connected to the external voltage, and outputs the first driving signal received from the third sub-circuit through the first output terminal of the second sub-circuit, so as to maintain the driving signal meeting the voltage requirement required by the second display device through the first output terminal of the first sub-circuit and the first output terminal of the second sub-circuit.

2. The conversion circuit of claim 1, wherein, The first sub-circuit comprises a first switch module, a first soft-start module, a first capacitor and a second switch module; The first end of the first switch module is connected to the original driving signal transmitted by the first display device, the second end of the first switch module is connected to the first end of the first soft-start module, and the third end of the first switch module is grounded; The second end of the first soft-start module is connected to the first end of the second switch module, the third end of the first soft-start module is connected to the second end of the second switch module and the first end of the first capacitor, and the second end of the first soft-start module is connected to the external voltage terminal; the second end and the third end of the first switch module are turned on only when the external voltage terminal is connected to the external voltage; The second end of the first capacitor is connected to the third end of the second switch module, and the first end and the third end of the second switch module are turned on only when the external voltage terminal is connected to the external voltage; the third end of the second switch module is used to transmit the second driving signal meeting the voltage requirement to the second display device when the first end and the third end of the second switch module are turned on.

3. The conversion circuit of claim 2, wherein, The first switch module comprises a first resistor, a second resistor and a first triode; The first end of the first resistor is connected to the original driving signal transmitted by the first display device, the second end of the first resistor is connected to the first end of the second resistor and the base of the first triode; The second end of the second resistor is connected to the emitter of the first triode, and the emitter of the first triode is grounded; The collector of the first triode is connected to the first end of the first soft-start module.

4. The conversion circuit of claim 3, wherein, The first soft-start module comprises a third resistor, a fourth resistor, a first diode and a second capacitor; The first end of the third resistor is connected with the collector of the first triode, the first end of the fourth resistor and the anode of the first diode; The second end of the third resistor is connected with the first end of the second capacitor and the first end of the second switch module, and the second end of the third resistor is used for connecting an external voltage terminal; The second end of the fourth resistor is connected with the second end of the second capacitor, the cathode of the first diode, the second end of the second switch module and the first end of the second capacitor.

5. The conversion circuit of claim 4, wherein, The second switch module is a first MOS tube; The source of the first MOS tube is connected with the first end of the second capacitor; The gate of the first MOS tube is connected with the cathode of the first diode; The drain of the first MOS tube is connected with the second end of the first capacitor, and the drain of the first MOS tube is used for sending the second driving signal meeting the voltage requirement to the second display device when being turned on.

6. The conversion circuit according to any one of claims 1 to 5, characterized in that, The third sub-circuit comprises a third switch module, a fifth resistor, a boost chip, a first filter module, a second filter module, a first inductor, a second diode, a sixth resistor and a seventh resistor; The first end of the third switch module is used for connecting an external voltage terminal, the second end of the third switch module is connected with the enable pin of the boost chip and the first end of the fifth resistor, the third end of the third switch module is grounded, and the second end and the third end of the third switch module are turned on only when the external voltage terminal accesses an external voltage. The second end of the fifth resistor is connected with the first end of the first filter module, the first end of the first inductor and the voltage input pin of the boost chip, and the first end of the first filter module is used for accessing the original driving signal sent by the first display device. The second end of the first filter module is grounded. The second end of the first inductor is connected with the anode of the second diode and the switch control pin of the boost chip. The cathode of the second diode is connected with the first end of the sixth resistor, the first end of the second filter module and the second end of the second sub-circuit. The second end of the sixth resistor is connected with the voltage feedback pin of the boost chip and the first end of the seventh resistor. The second end of the seventh resistor is connected with the ground pin of the boost chip, and the boost chip only works in the boost mode when the external voltage terminal does not access the external voltage. The second end of the second filter module is grounded.

7. The conversion circuit of claim 6, wherein, The third switch module comprises an eighth resistor, a ninth resistor and a second triode; The first end of the eighth resistor is used for connecting an external voltage terminal, the second end of the eighth resistor is connected with the first end of the ninth resistor and the base of the second triode; The second end of the ninth resistor is connected with the emitter of the second triode, and the emitter of the second triode is grounded. The collector of the second triode is connected with the first end of the fifth resistor.

8. The conversion circuit of claim 6, wherein, The first filter module comprises at least one third capacitor; The first end of the third capacitor is connected with the first end of the first inductor, and the first end of the third capacitor is used for accessing the original driving signal sent by the first display device. The second end of the third capacitor is grounded.

9. The conversion circuit of claim 6, wherein, The second filter module comprises at least one fourth capacitor and a first electrolytic capacitor; The first end of the fourth capacitor is connected with the cathode of the second diode, the positive pole of the first electrolytic capacitor and the second input end of the second sub-circuit; The second end of the fourth capacitor and the negative pole of the first electrolytic capacitor are grounded.

10. The conversion circuit according to any one of claims 1 to 5, characterized in that The second sub-circuit comprises a fourth switch module, a second slow start module, a fifth switch module and a fifth capacitor; The first end of the fourth switch module is used for connecting an external voltage terminal, the second end of the fourth switch module is connected with the first end of the second slow start module, the third end of the fourth switch module is grounded, and the second end and the third end of the fourth switch module are conductive only when the external voltage terminal is not connected with the external voltage; The second end of the second slow start module is connected with the first end of the fifth switch module and the first output end of the third sub-circuit; The third end of the second slow start module is connected with the second end of the fifth switch module and the first end of the fifth capacitor; The third end of the fifth switch module is connected with the second end of the fifth capacitor, the third end of the fifth switch module is used for connecting a second display device, and the first end and the third end of the fifth switch module are conductive only when the external voltage terminal is not connected with the external voltage, and the third end of the fifth switch module is used for sending the first driving signal received from the third sub-circuit to the second display device.

11. The conversion circuit of claim 10, wherein, The fourth switch module comprises a tenth resistor, an eleventh resistor and a third triode; The first end of the tenth resistor is used for connecting an external voltage terminal, the second end of the tenth resistor is connected with the first end of the eleventh resistor and the base of the third triode; The second end of the eleventh resistor is connected with the collector of the third triode, and the collector of the third triode is grounded; The emitter of the third triode is connected with the first end of the second slow start module.

12. The conversion circuit of claim 11, wherein, The second slow start module comprises a twelfth resistor, a thirteenth resistor, a sixth capacitor and a third diode; The first end of the twelfth resistor is connected with the emitter of the third triode, the first end of the thirteenth resistor and the anode of the third diode; The second end of the twelfth resistor is connected with the first end of the fifth switch module and the first end of the sixth capacitor, and the second end of the twelfth resistor is connected with the first output end of the third sub-circuit; The second end of the thirteenth resistor is connected with the cathode of the third diode, the second end of the sixth capacitor, the second end of the fifth switch module and the first end of the fifth capacitor.

13. The conversion circuit of claim 12, wherein, The fifth switch module comprises a second MOS tube and a third MOS tube; The source of the second MOS tube is connected with the second end of the twelfth resistor, the gate of the second MOS tube is connected with the cathode of the third diode and the gate of the third MOS tube, and the drain of the second MOS tube is connected with the drain of the third MOS tube; The source of the third MOS tube is connected with the second end of the fifth capacitor, and the source of the third MOS tube is used to send the first driving signal received from the third sub-circuit to the second display device when it is turned on.

14. An electronic device, comprising: The conversion circuit comprises a first display device, a second display device and any one of claims 1-13. The first display device is connected with the second display device through the conversion circuit.

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