CN218006401U

CN218006401U - TypeC and HDMI two-in-one automatic display control circuit and device

Info

Publication number: CN218006401U
Application number: CN202221642845.7U
Authority: CN
Inventors: 张旅冰; 唐昕; 谢峰
Original assignee: Changsha Pengxin Technology Co ltd
Current assignee: Changsha Pengxin Technology Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-12-09
Anticipated expiration: 2032-06-27

Abstract

The utility model discloses a two unification automatic display control circuits of TypeC and HDMI and device, include: a transmission sub-circuit and a display control sub-circuit; the transmission sub-circuit comprises a TypeC transmission module and an HDMI transmission module; the display control sub-circuit comprises a PD protocol power supply control module, a TypeC interface module, a signal turning module, a DP/HDMI switching module, a TypeC protocol module, a video conversion module and a display interface; the TypeC transmission module and the HDMI transmission module are electrically connected with the TypeC interface module; the TypeC interface module is respectively and electrically connected with the DP/HDMI switching module, the video conversion module and the PD protocol power supply control module; the PD protocol power supply control module is electrically connected with the DP/HDMI switching module; the video conversion module is respectively electrically connected with the signal turning module, the DP/HDMI switching module and the TypeC protocol module, and the display interface is electrically connected with the video conversion module. The utility model discloses a transmission of 1 TypeC interface realization TypeC signal and HDMI signal simultaneously can automatic identification TypeC signal or HDMI signal and show at display terminal, and user experience is high.

Description

TypeC and HDMI two-in-one automatic display control circuit and device

Technical Field

The utility model relates to a show control technical field, especially relate to a two unification automatic display control circuits of type C and HDMI and device.

Background

The current TypeC and HDMI system functions are relatively independent, and a user brings much inconvenience in the using process; for a design manufacturer, two different interfaces need to be provided for two different wires, which brings larger size and cost to the product. Therefore, the invention provides a reliable type c and HDMI two-in-one automatic display control circuit, which is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a two unification automatic display control circuits of TypeC and HDMI and device, in this scheme, realize the transmission of TypeC signal and HDMI signal simultaneously through 1 TypeC interface, can automatic identification TypeC signal or HDMI signal and show at display terminal, user experience is high.

In order to solve the technical problem, the application provides a type c and HDMI two-in-one automatic display control circuit, which comprises a transmission sub-circuit and a display control sub-circuit; the transmission sub-circuit comprises a TypeC transmission module and an HDMI transmission module; the display control sub-circuit comprises a PD protocol power supply control module, a TypeC interface module, a signal turning module, a DP/HDMI switching module, a TypeC protocol module, a video conversion module and a display interface;

the TypeC transmission module and the HDMI transmission module are electrically connected with the TypeC interface module;

the TypeC interface module is respectively and electrically connected with the DP/HDMI switching module, the video conversion module and the PD protocol power supply control module; the PD protocol power supply control module is electrically connected with the DP/HDMI switching module;

the video conversion module is respectively electrically connected with the signal turning module, the DP/HDMI switching module and the TypeC protocol module, and the display interface is electrically connected with the video conversion module.

Preferably, the PD protocol power supply control module includes a first triode, a second triode, and a first capacitor;

the emitting electrode of the first triode is electrically connected with a first CC pin of the TypeC interface module, the emitting electrode of the second triode is electrically connected with a second CC pin of the TypeC interface module, the collecting electrode of the first triode is grounded, the collecting electrode of the second triode is grounded, the base electrode of the first triode is respectively electrically connected with the base electrode of the second triode, the input power supply and the first end of the first capacitor, and the second end of the first capacitor is grounded.

Preferably, the PD protocol power supply control module further includes a first resistor, a second resistor, a third resistor, and a fourth resistor;

the first end of the first resistor is electrically connected with the collector electrode of the first triode, the second end of the first resistor is grounded, the first end of the second resistor is electrically connected with the collector electrode of the second triode, the second end of the second resistor is grounded, the first end of the third resistor is respectively electrically connected with the base electrode of the first triode, the base electrode of the second triode, the first end of the first capacitor and the first end of the fourth resistor, and the second end of the third resistor is electrically connected with the input power supply.

Preferably, the HDMI transmission module comprises an HDMI male connector, a TypeC male connector and a USB male connector;

the male head of TypeC reaches the male head of USB all with the public first electricity of HDMI is connected, the public head of HDMI is used for being connected with the HDMI wire electricity, the public head of TypeC be used for with the electric connection of TypeC interface module.

Preferably, the HDMI male connector further comprises a fifth resistor;

the first end of the fifth resistor is electrically connected with the H-PLUGDET pin of the HDMI male connector and the CC pin of the TypeC male connector respectively, and the second end of the fifth resistor is grounded.

Preferably, the TypeC interface module comprises a TypeC female socket and a sixth resistor;

the TypeC female seat is electrically connected with the TypeC transmission module, the HDMI transmission module, the DP/HDMI switching module, the video conversion module and the PD protocol power supply control module respectively;

the first end of the sixth resistor is electrically connected with the GND pin of the TypeC female socket, and the second end of the sixth resistor is electrically connected with an input power supply.

Preferably, the DP/HDMI switching module comprises a DP/HDMI switching unit and a hot plug unit;

the DP/HDMI switching unit is respectively electrically connected with the TypeC interface module, the PD protocol power supply control module, the video conversion module and the hot plug unit, and the hot plug unit is electrically connected with the video conversion module.

Preferably, the hot plug unit comprises a schottky double diode;

the first end of the Schottky double diode is electrically connected with the video conversion module, and the second end and the third end of the Schottky double diode are electrically connected with the DP/HDMI switching unit.

Preferably, the hot plug unit further comprises a seventh resistor, an eighth resistor and a ninth resistor;

a first end of the seventh resistor is electrically connected with an input power supply, and a second end of the seventh resistor is electrically connected with a first end of the Schottky double diode; the first end of the eighth resistor is electrically connected with the second end of the Schottky double diode, the first end of the ninth resistor is electrically connected with the third end of the Schottky double diode, and the second end of the eighth resistor and the second end of the ninth resistor are electrically connected with the input power supply.

In order to solve the technical problem, the application provides a type C and HDMI two-in-one automatic display control device, which comprises a type C and HDMI two-in-one automatic display control circuit.

The utility model discloses a two unification automatic display control circuits of TypeC and HDMI and device have following beneficial effect, the utility model discloses a two unification automatic display control circuits of TypeC and HDMI include: a transmission sub-circuit and a display control sub-circuit; the transmission sub-circuit comprises a TypeC transmission module and an HDMI transmission module; the display control sub-circuit comprises a PD protocol power supply control module, a TypeC interface module, a signal turning module, a DP/HDMI switching module, a TypeC protocol module, a video conversion module and a display interface;

the TypeC transmission module is used for being connected with a TypeC device to realize transmission of a TypeC signal source; the TypeC interface module is used for receiving the HDMI signal source or the TypeC signal source; the PD protocol power supply control module is used for controlling the TypeC equipment to provide a C0-VBUS power supply to the display control sub-circuit after detecting the input of the TypeC signal source;

the HDMI transmission module is used for being connected with HDMI equipment to realize the transmission of an HDMI signal source; the HDMI transmission module is used for controlling the HDMI equipment to provide a C0-VBUS power supply to the display control sub-circuit after detecting the input of the HDMI signal source;

the TypeC protocol module is used for identifying the positive and negative insertion states of a joint inserted by the TypeC interface module; the signal turning module is used for turning over a signal when the insertion interface is reversely inserted; the video conversion module is used for controlling a working channel of the DP/HDMI switching module, and switching and transmitting the TypeC signal source or the HDMI signal source to the video conversion module for audio and video conversion and then transmitting the audio and video converted signal to the display interface for output. Therefore, the utility model discloses a transmission of type C signal and HDMI signal is realized simultaneously to 1 individual type C interface, can automatic identification type C signal or HDMI signal and show at display terminal, and user experience is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to these drawings:

fig. 1 is a schematic structural diagram of a type c and HDMI two-in-one automatic display control circuit according to a preferred embodiment of the present invention;

fig. 2 is a circuit diagram of a PD protocol power control module of a TypeC and HDMI two-in-one automatic display control circuit according to a preferred embodiment of the present invention;

fig. 3 is a circuit diagram of a PD protocol power control module of a TypeC and HDMI two-in-one automatic display control circuit according to a preferred embodiment of the present invention;

fig. 4 is a circuit diagram of a PD protocol power control module of a TypeC and HDMI two-in-one automatic display control circuit according to a preferred embodiment of the present invention;

fig. 5 is a circuit diagram of a PD protocol power control module of a TypeC and HDMI two-in-one automatic display control circuit according to a preferred embodiment of the present invention;

fig. 6 is a circuit diagram of a PD protocol power control module of a TypeC and HDMI two-in-one automatic display control circuit according to a preferred embodiment of the present invention;

fig. 7 is a circuit diagram of a PD protocol power control module of a TypeC and HDMI two-in-one automatic display control circuit according to a preferred embodiment of the present invention.

Detailed Description

The core of this application provides a two unification automatic display control circuit of TypeC and HDMI and device, in this scheme, realizes the transmission of TypeC signal and HDMI signal simultaneously through 1 TypeC interface, can automatic identification TypeC signal or HDMI signal and show at display terminal, and user experience is high.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a type c and HDMI two-in-one automatic display control circuit provided in the present application, including a transmission sub-circuit 1 and a display control sub-circuit 2; the transmission sub-circuit 1 comprises a TypeC transmission module 11 and an HDMI transmission module 12; the display control sub-circuit 2 comprises a PD protocol power supply control module 21, a TypeC interface module 22, a signal turning module 23, a DP/HDMI switching module 24, a TypeC protocol module 25, a video conversion module 26 and a display interface 27;

the TypeC transmission module 11 and the HDMI transmission module 12 are used for being electrically connected with the TypeC interface module 22;

the typeC interface module 22 is respectively and electrically connected with the DP/HDMI switching module 24, the video conversion module 26 and the PD protocol power supply control module 21; the PD protocol power supply control module 21 is electrically connected with the DP/HDMI switching module 24;

the video conversion module is electrically connected with the signal flip module, the DP/HDMI switch module 24 and the TypeC protocol module 25, respectively, and the display interface 27 is electrically connected with the video conversion module 26.

In the prior art, the current TypeC and HDMI system are relatively independent in function, and a user brings much inconvenience in the use process; for a designer, two different interfaces need to be provided for two different wires, which brings larger size and cost to the product.

Aiming at the above disadvantages, in this application, the cooperation through the type c transmission module 11, the HDMI transmission module 12, the PD protocol power control module 21, the type c interface module 22, the signal flip module 23, the DP/HDMI switching module 24, the type c protocol module 25, the video conversion module 26 and the display interface 27 realizes the transmission of the type c signal and the HDMI signal through 1 type c interface at the same time, the type c signal or the HDMI signal can be automatically identified and displayed on the display terminal, and the user experience is high.

Specifically, when the type C device is plugged into the type C interface module 22 through a standard type C wire, the PD protocol power control module 21 is turned on, and the type C device provides a C0-VBUS power to the display control sub-circuit 2; the TypeC protocol module 25 and the DP/HDMI switching module 24 are powered on, the TypeC device and the TypeC protocol module 25 start to carry out CC communication, and at the moment, the PD protocol power supply control module 21 is disconnected and does not work any more, so that CC signals are not influenced; the system is completely powered on, the TypeC protocol module 25 and the TypeC device CC are communicated, the forward and reverse plugging states of the TypeC device are sent to the video conversion module 26, the video conversion module 26 learns that the TypeC wire is plugged, and after the video conversion module 26 obtains the forward and reverse plugging states of the TypeC wire, if the reverse plugging control signal overturning module 23 carries out signal overturning; the video conversion module 26 sets the DP/HDMI switching module 24 in the DP channel, the video conversion module 26 starts communication with the TypeC device through the signal turning module 23, the DP/HDMI switching module 24, and receives the audio/video signal sent by the TypeC device, and the video conversion module 26 converts the audio/video signal into an image signal and transmits the image signal to the display terminal interface.

Specifically, when the HDMI customized wire is plugged into the TypeC interface module 22 in the forward plugging state, the PD protocol power supply control module 21 does not operate, and the HDMI transmission module 12 provides the C0-VBUS power supply to the display control sub-circuit 2; the type C protocol module 25 and the DP/HDMI switching module 24 are powered on, the type C protocol module 25 detects no CC communication, the system is powered on completely, the video conversion module 26 reads the plug-in state of the HDMI customized wire, the video conversion module 26 sets the DP/HDMI switching module 24 in an HDMI channel, the video conversion module 26 starts communication with the HDMI device through the signal overturning module 23 and the DP/HDMI switching module 24, receives audio and video signals sent by the HDMI device, and the video conversion module 26 converts the audio and video signals into image signals to be transmitted to a display terminal interface.

Specifically, when the HDMI customized wire is plugged into the TypeC interface module 22 in a reverse plug state, the PD protocol power supply control module 21 does not operate, and the HDMI transmission module 12 provides a C0-VBUS power supply to the display control sub-circuit 2; the type C protocol module 25 and the DP/HDMI switching module 24 are powered on, the type C protocol module 25 detects no CC communication, the system is powered on completely, the video conversion module 26 reads the reverse insertion state of the HDMI customized wire, the video conversion module 26 sets the DP/HDMI switching module 24 in an HDMI channel, the video conversion module 26 starts communication with the HDMI device through the signal overturning module 23 and the DP/HDMI switching module 24, receives audio and video signals sent by the HDMI device, and the video conversion module 26 converts the audio and video signals into image signals to be transmitted to a display terminal interface.

In summary, the application provides a type c and HDMI two-in-one automatic display control circuit, in the present scheme, a type c transmission module 11 is used for being connected with a type c device, so as to realize transmission of a type c signal source; the TypeC interface module 22 is configured to receive an HDMI signal source or a TypeC signal source; the PD protocol power supply control module 21 is used for controlling the TypeC equipment to provide a C0-VBUS power supply to the display control sub-circuit 2 after detecting the input of the TypeC signal source; the HDMI transmission module 12 is used for connecting with an HDMI device to realize transmission of an HDMI signal source; the HDMI transmission module 12 is configured to control the HDMI device to provide a C0-VBUS power to the display control sub-circuit after detecting an input of the HDMI signal source; the TypeC protocol module 25 is used for identifying the positive and negative insertion states of a joint inserted by the TypeC interface module; the signal turning module 23 is used for turning signals when the insertion interface is reversely inserted; the video conversion module 26 is configured to control a working channel of the DP/HDMI switching module, and switch and transmit a TypeC signal source or an HDMI signal source to the video conversion module 26 for audio/video conversion and then transmit the converted signal to a display interface for output. Therefore, the utility model discloses a transmission of 1 TypeC interface realization TypeC signal and HDMI signal simultaneously can automatic identification TypeC signal or HDMI signal and show at display terminal, and user experience is high.

On the basis of the above-described embodiment:

referring to fig. 2, fig. 2 is a schematic circuit diagram of a PD protocol power control module 21 of a TypeC and HDMI two-in-one automatic display control circuit provided in the present application.

Referring to fig. 6, fig. 6 is a schematic circuit diagram of a signal flipping module 23 of a TypeC and HDMI two-in-one automatic display control circuit provided in the present application.

Referring to fig. 7, fig. 7 is a schematic circuit diagram of a TypeC protocol module 25 of a TypeC and HDMI two-in-one automatic display control circuit according to the present application.

Preferably, the PD protocol power supply control module 21 includes a first triode Q3, a second triode Q4 and a first capacitor C24;

the emitting electrode of first triode Q3 is connected with TypeC interface module 22's first CC pin electricity, the emitting electrode of second triode Q4 is connected with TypeC interface module 22's second CC pin electricity, first triode Q3's collecting electrode ground connection, second triode Q4's collecting electrode ground connection, first triode Q3's base is connected with second triode Q4's base, input power supply and first electric capacity C24's first end electricity respectively, first electric capacity C24's second end ground connection.

Preferably, the PD protocol power control module 21 further includes a first resistor R24, a second resistor R25, a third resistor R23, and a fourth resistor R22;

the first end of the first resistor R24 is electrically connected with the collector of the first triode Q3, the second end of the first resistor R24 is grounded, the first end of the second resistor R25 is electrically connected with the collector of the second triode Q4, the second end of the second resistor R25 is grounded, the first end of the third resistor R23 is respectively electrically connected with the base of the first triode Q3, the base of the second triode Q4, the first end of the first capacitor C24 and the first end of the fourth resistor R22, and the second end of the third resistor R23 is electrically connected with the input power supply.

Specifically, when the TypeC device is plugged into the TypeC interface module 22 through a standard TypeC wire, because pins A1 and B1 of the TypeC wire are connected to the ground network and are at a low level, pins A5 and B5 of the TypeC wire are connected to CC signals, pins 67 and Pin68 of the video conversion module 26 are both at a low level, and pins A5 and B5 of the TypeC interface module 22 are connected to

pins

14 and 15 of the DP/HDMI switching module 24, pin2 of the first triode Q3, and Pin2 of the second triode Q4; the Pin1 of the first triode Q3 is at a low level, the Pin1 of the second triode Q4 is at a low level, the Pin2 and the Pin3 of the first triode Q3 are communicated or the Pin2 and the Pin3 of the second triode Q4 are conducted, and the CC Pin is pulled down by 5.1K, so that the TypeC device provides a C0-VBUS power source for the display control sub-circuit 2, the first capacitor C24 starts to be charged, and the TypeC protocol module 25 and the DP/HDMI switching module 24 are powered on.

Specifically, after the TypeC protocol module 25 and the DP/HDMI switching module 24 are powered on, pin17 of the DP/HDMI switching module 24 is pulled high by default, pin14 of the DP/HDMI switching module 24 is connected with Pin20, pin15 is connected with Pin21, pins A5 and B5 (CC signals) of the TypeC interface module 22 are connected with pins 3 and 4 of the TypeC protocol module 25, the TypeC device and the TypeC protocol module 25 start CC communication, the first capacitor C24 is charged to 5V, pin1 of the first triode Q3 is at high level, pin1 of the second triode Q4 is at high level, pin2 and Pin3 of the first triode Q3 are disconnected, pin2 and Pin3 of the second triode Q4 are disconnected, and the first triode Q2 and the second triode Q3 do not work any more so as to avoid affecting the CC signals; the DP/HDMI switching module 24 pulls down Pin31 to enable the system to be completely powered on, the DP/HDMI switching module 24 and the TypeC device CC complete communication, the forward and reverse plugging states of the TypeC device are sent to Pin209 of the video conversion module 26 through Pin9, the video conversion module 26 reads that Pin67 and Pin68 are both low levels to know that a TypeC wire is inserted, after the video conversion module 26 obtains the insertion and forward and reverse plugging states of the TypeC device, the Pin204 sets the signal overturning module 23, the video conversion module 26 sets Pin17 of the DP/HDMI switching module 24 to be high levels through Pin14, the DP/HDMI switching module 24 is set to be in the DP state, the video conversion module 26 starts communication through the signal overturning module 23, the DP/HDMI switching module 24 and the TypeC device, receives audio and video signals sent by the TypeC device, and the video conversion module 26 converts the audio and video signals into image signals and transmits the image signals to the display terminal interface J6.

Referring to fig. 3, fig. 3 is a schematic circuit diagram of an HDMI transmission module 12 of a TypeC and HDMI two-in-one automatic display control circuit provided in the present application.

Preferably, the HDMI transmission module 12 includes an HDMI male connector, a TypeC male connector, and a USB male connector; public head of TypeC and the public head of USB all are connected with the public first electricity of HDMI, and the public head of HDMI is used for being connected with the HDMI wire rod electricity, and the public head of TypeC is used for being connected with TypeC interface module 22 electricity.

Preferably, the HDMI male connector further comprises a fifth resistor R42;

the first end of the fifth resistor R42 is electrically connected with the H-PLUGDET pin of the HDMI male connector and the CC pin of the TypeC male connector respectively, and the second end of the fifth resistor R42 is grounded.

Referring to fig. 4, fig. 4 is a schematic circuit diagram of a TypeC interface module 22 of a TypeC and HDMI two-in-one automatic display control circuit provided in the present application.

Preferably, the TypeC interface module 22 includes a TypeC female socket J5 and a sixth resistor R29;

the typeC female socket J5 is electrically connected with the typeC transmission module 11, the HDMI transmission module 12, the DP/HDMI switching module 24, the video conversion module 26 and the PD protocol power supply control module 21 respectively;

the first end of the sixth resistor R29 is electrically connected with the GND pin of the TypeC female socket J5, and the second end of the sixth resistor R29 is electrically connected with the input power supply.

Specifically, when the HDMI customized wire is in a forward-insertion state, the HDMI male plug J1 is inserted into the HDMI device, the USB male plug J3 is inserted into the USB power device, and the TypeC male plug J2 is inserted into the TypeC interface module 22, because the HDMI customized wire A1 is a blank pin, B1 and A5 of the HDMI customized wire are connected to the ground network, B5 of the HDMI customized wire is connected to the HPD signal (pulled down to the ground network by the fifth resistor R42 by default), and the a-plane pin of the TypeC male plug J2 is connected to the a-plane pin of the TypeC interface module 22; the B-plane Pin of the TypeC male plug J2 is connected to the B-plane Pin of the TypeC interface module 22, the A1 Pin of the TypeC interface module 22 is pulled to high level by the sixth resistor R29, the B1 and A5 pins of the TypeC interface module 22 are low level, the B5 Pin of the TypeC interface module 22 is low level, the Pin67 Pin68 Pin of the video conversion module 26 is high level, the A5 and B5 pins (low level) of the TypeC interface module 22 are connected to the Pin14 and Pin15 of the DP/HDMI switching module 24, the Pin2 of the first triode Q3 and the Pin2 of the second triode Q4, the first triode Q3 and the second triode Q4 are disconnected and do not work, and the USB power supply device provides a C0-VBUS power supply to power on the display control sub-circuit 2, the TypeC protocol module 25 and the HDMI/DP switching module 24;

specifically, after the TypeC protocol module 25 and the DP/HDMI switching module 24 are powered on, the Pin17 of the DP/HDMI switching module 24 is default pulled high, the Pin14 of the DP/HDMI switching module 24 is connected to the Pin20, the Pin15 is connected to the Pin21, the pins A5 and B5 (low level) of the TypeC interface module 22 are connected to the pins 3 and 4 of the TypeC protocol module 25, the TypeC protocol module 25 detects two low levels, no CC communication exists, and the DP/HDMI switching module 24 pulls the Pin31 low, so that the system is powered on completely; the video conversion module 26 reads that Pin67 is at a high level and Pin68 is at a low level, and knows that the HDMI customized wire is in a positive insertion state; after the video conversion module 26 learns that the HDMI device is in the normal insertion state, the signal inversion module 23 is set through the Pin204, the video conversion module 26 sets the Pin17 of the DP/HDMI switching module 24 to be the low level through the Pin14, and sets the DP/HDMI switching module 24 to be in the HDMI state, the video conversion module 26 starts to communicate with the HDMI device through the signal inversion module 23 and the DP/HDMI switching module 24 to receive the audio/video signal sent by the HDMI device, and the video conversion module 26 converts the audio/video signal into an image signal and transmits the image signal to the display terminal interface.

Specifically, the HDMI customized wire is in a reverse-plug state, when the HDMI male plug J1 is plugged into the HDMI device, the USB male plug J3 is plugged into the USB power device, and the TypeC male plug J2 is reversely plugged into the TypeC interface module 22, because A1 of the HDMI customized wire is an empty pin, B1 and A5 of the HDMI customized wire are connected to the ground network, B5 of the HDMI customized wire is connected to the HPD signal (pulled down to the ground network by the fifth resistor R42 by default), and a-side pin of the TypeC male plug J2 is connected to a B-side pin of the TypeC interface module 22; a Pin B of the TypeC male plug J2 is connected to a Pin a of the TypeC interface module 22, a Pin B1 of the TypeC interface module 22 is pulled to a high level by a sixth resistor R29, pins A1 and B5 of the TypeC interface module 22 are at low levels, A5 of the TypeC interface module 22 is at low level, a Pin67 of the video conversion module 26 is at low level, a Pin68 is at high level, A5 and B5 (at low levels) of the TypeC interface module 22 are connected to a Pin14 and a Pin1415 of the DP/HDMI switching module 24, a Pin2 of the first triode Q3 and a Pin2 of the second triode Q4, the first triode Q3 and the second triode Q4 are disconnected and do not work, the USB power supply device provides a C0-VBUS power supply to the display control circuit 2, the TypeC protocol module 25 is powered on, and the DP/HDMI switching module 24 is powered on;

specifically, after the TypeC protocol module 25 is powered on, the DP/HDMI switching module 24 is powered on, the Pin17 of the DP/HDMI switching module 24 is default pulled high, the Pin14 of the DP/HDMI switching module 24 is connected to the Pin20, the Pin15 is connected to the Pin21, the pins A5 and B5 (low level) of the TypeC interface module 22 are connected to the pins 3 and 4 of the TypeC protocol module 25, the TypeC protocol module 25 detects two low levels, no CC communication exists, the DP/HDMI switching module 24 pulls the Pin31 low, so that the system is fully powered on; the video conversion module 26 reads that Pin67 is at a low level, pin68 is at a high level, it is known that the HDMI customized wire is in a reverse insertion state, after the video conversion module 26 knows that the HDMI device is in a reverse insertion state, the signal flip module 23 is set through Pin204, the video conversion module 26 sets Pin17 of the DP/HDMI switch module 24 to be at a low level through Pin14, the DP/HDMI switch module 24 is set to be in an HDMI state, the video conversion module 26 starts communication with the HDMI device through the signal flip module 23, the DP/HDMI switch module 24, and receives an audio/video signal sent by the HDMI device, and the video conversion module 26 converts the audio/video signal into an image signal and transmits the image signal to the display terminal interface.

Referring to fig. 5, fig. 5 is a schematic circuit diagram of the DP/HDMI switching module 24 of the TypeC and HDMI two-in-one automatic display control circuit provided in the present application.

Preferably, the DP/HDMI switching module 24 includes a DP/HDMI switching unit and a hot plug unit;

the DP/HDMI switching unit is respectively electrically connected with the TypeC interface module 22, the PD protocol power supply control module 21, the video conversion module and the hot plug unit, and the hot plug unit is electrically connected with the video conversion module.

Preferably, the hot swap unit comprises a schottky double diode Q5;

the first end of the Schottky double diode Q5 is electrically connected with the video conversion module, and the second end and the third end of the Schottky double diode Q5 are electrically connected with the DP/HDMI switching unit.

Preferably, the hot plug unit further includes a seventh resistor R33, an eighth resistor R34, and a ninth resistor R35;

a first end of the seventh resistor R33 is electrically connected with the input power supply, and a second end of the seventh resistor R33 is electrically connected with a first end of the Schottky double diode Q5; a first end of the eighth resistor R34 is electrically connected to the second end of the schottky diode Q5, a first end of the ninth resistor R35 is electrically connected to the third end of the schottky diode Q5, and a second end of the eighth resistor R34 and a second end of the ninth resistor R35 are electrically connected to the input power source.

Specifically, the hot plug unit is used for notifying the HDMI source to send a signal to the DP/HDMI switch module 24 when the HPD transitions from low to high, and the DP/HDMI switch module 24 communicates with the video switch module 26, thereby realizing reliable hot plug detection.

Specifically, in the present application, the chip type of the video conversion module 26 is RTD2795T, and the chip type of the video conversion module 26 is not specifically limited.

The application also provides a two unification automatic display control devices of TypeC and HDMI, include a two unification automatic display control circuits of TypeC and HDMI.

For the introduction of the type c and HDMI two-in-one automatic display control circuit provided in the present application, please refer to the above embodiments, which are not repeated herein.

It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A type C and HDMI two-in-one automatic display control circuit is characterized by comprising a transmission sub-circuit and a display control sub-circuit; the transmission sub-circuit comprises a TypeC transmission module and an HDMI transmission module; the display control sub-circuit comprises a PD protocol power supply control module, a TypeC interface module, a signal turning module, a DP/HDMI switching module, a TypeC protocol module, a video conversion module and a display interface;

the TypeC interface module is electrically connected with the DP/HDMI switching module, the video conversion module and the PD protocol power supply control module respectively; the PD protocol power supply control module is electrically connected with the DP/HDMI switching module;

2. The type C and HDMI two-in-one automatic display control circuit according to claim 1, wherein said PD protocol power control module comprises a first transistor, a second transistor and a first capacitor;

3. The type C and HDMI two-in-one automatic display control circuit according to claim 2, wherein said PD protocol power control module further comprises a first resistor, a second resistor, a third resistor and a fourth resistor;

4. The TypeC and HDMI two-in-one automatic display control circuit according to claim 1, wherein said HDMI transmission module comprises a male HDMI head, a male TypeC head and a male USB head;

5. The TypeC and HDMI two-in-one automatic display control circuit according to claim 4, wherein said HDMI male connector further comprises a fifth resistor;

6. The TypeC and HDMI two-in-one automatic display control circuit according to claim 1, wherein said TypeC interface module comprises a TypeC female socket and a sixth resistor;

7. The TypeC and HDMI two-in-one automatic display control circuit according to claim 1, wherein said DP/HDMI switching module comprises a DP/HDMI switching unit and a hot plug unit;

8. The type C and HDMI two-in-one automatic display control circuit according to claim 7, wherein said hot plug unit comprises a Schottky diode;

9. The type C and HDMI two-in-one automatic display control circuit according to claim 8, wherein said hot plug unit further comprises a seventh resistor, an eighth resistor and a ninth resistor;

10. A type c and HDMI two-in-one automatic display control device comprising the type c and HDMI two-in-one automatic display control circuit of any one of claims 1 to 9.