Projection control circuit and method, and electronic equipment

Abstract

The present application discloses a projection control circuit and method, and an electronic device, which are applied to train tunnel image projection, wherein the projection control circuit includes: an image projection circuit; a position detection circuit, which is used to obtain a train station signal; a first control circuit, which couples the position detection circuit and the image projection circuit, to receive the train station signal sent by the position detection circuit, generates a first image signal based on the train station signal, and sends the first image signal to the image projection circuit, so that the image projection circuit can directionally project the train station information. In the above manner, the projection control circuit in the present application can display the train station information on the tunnel wall in the form of a projection screen, thereby significantly increasing the display screen, making it easier for passengers to identify, avoiding the situation where passengers miss the station, and also facilitating a better display of the display screen.

Description

Technical Field

[0001] The present application relates to the technical field of power management, and in particular to a projection control circuit and method, and electronic equipment. Background Art

[0002] Until now, subway station information has been provided through voice broadcasts and text displays on small LED (Light-Emitting Diode) screens above the doors and small LCD screens inside the train. Due to the noisy environment inside the train, the noise of train operation, or because passengers are focused on their mobile phones, they often miss the voice broadcast link. At this time, they can only check the scrolling text announcement information on the small screen inside the train to understand the train arrival situation. However, because the text information is displayed on the LED screen above the door and the small LCD screen on the side of the door, passengers who are a little far away from here cannot see the text content because the font is too small, resulting in many troubles such as missing the station. Summary of the invention

[0003] The main technical problem solved by the present application is to provide a projection control circuit and method, and an electronic device, which can solve the problem in the prior art that the font size of train station information display is too small, which is difficult to see clearly and easily causes passengers to miss the station.

[0004] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide a projection control circuit to project the train arrival information onto the tunnel wall at the same height as the window glass (i.e., applied to subway tunnel image projection) ， Among them, the projection control circuit includes: an image projection circuit; a position detection circuit for obtaining a train station signal; a first control circuit, coupling the position detection circuit and the image projection circuit to receive the train station signal sent by the position detection circuit, generating a first image signal based on the train station signal, and sending the first image signal to the image projection circuit so that the image projection circuit directionally projects the train station information.

[0005] Among them, the projection control circuit also includes a light source control circuit, the light source control circuit is coupled to the image projection circuit and the first control circuit, the position detection circuit is also used to obtain the train entry and exit signal, and send the train entry and exit signal to the first control circuit, so that the first control circuit sends a light source control instruction to the light source control circuit based on the train entry and exit signal; wherein the light source control circuit is also used to receive the light source control instruction, and send the light source control signal to the image projection circuit based on the light source control instruction, so that the image projection circuit responds to the light source control signal to turn on or off the directional projection of the train station information (turn off the projection light source when entering the station, and turn on the light source when leaving the station and entering the tunnel).

[0006] Among them, the projection control circuit also includes a second control circuit, a first radio frequency communication circuit and a setting switch circuit, the second control circuit is coupled to the first radio frequency communication circuit and the setting switch circuit, the first radio frequency communication circuit is used for short-range wireless communication connection with the position detection circuit; wherein the second control circuit is also used to detect the switch state of the setting switch circuit, and control the first radio frequency communication circuit to send train station signals and / or train entry and exit signals in real time based on the switch state; when the position detection circuit establishes a short-range wireless communication connection with the radio frequency communication circuit, it receives the train station signal and / or the train entry and exit signal.

[0007] Among them, the projection control circuit also includes a third control circuit, a second RF communication circuit, a first communication detection circuit and a second communication detection circuit, the third control circuit is coupled to the second RF communication circuit, the first communication detection circuit and the second communication detection circuit, the second RF communication circuit is coupled to the second communication detection circuit, and is used for short-range wireless communication connection with the position detection circuit, the first communication detection circuit is coupled to the first RF communication circuit and the third control circuit, and the second communication detection circuit is coupled to the second control circuit; wherein, the first communication detection circuit is used to detect the first signal transmission state of the first RF communication circuit, so as to send the first signal transmission state to the second control circuit and the third control circuit; the second communication detection circuit is used to detect the second signal transmission state of the second RF communication circuit, so as to send the second signal transmission state to the second control circuit and the third control circuit; the second control circuit is also used to select and control the first RF communication circuit or the first RF communication circuit to send the train station signal and / or the train entry and exit signal in real time according to the first signal transmission state and the second signal transmission state; and when a signal failure occurs in the second control circuit, the third control circuit selects and controls the first RF communication circuit or the first RF communication circuit to send the train station signal and / or the train entry and exit signal in real time according to the first signal transmission state and the second signal transmission state.

[0008] Among them, the projection control circuit also includes a first indication circuit, a second indication circuit and a switch state indication circuit, the first indication circuit is coupled to the second control circuit, the second indication circuit is coupled to the third control circuit, and the switch state indication circuit is coupled to the second control circuit and the third control circuit; wherein the first indication circuit receives a first operating state signal sent by the second control circuit, and emits a first light signal or a second light signal based on the first operating state signal; the second indication circuit receives a second operating state signal sent by the third control circuit, and emits a first light signal or a second light signal based on the second operating state signal; the switch state indication circuit receives a first switch signal sent by the second control circuit and a second switch signal sent by the third control circuit, and emits a third light signal or a fourth light signal based on the first switch signal and the second switch signal.

[0009] Among them, the projection control circuit also includes a power supply circuit and a charging circuit, the charging circuit includes a charging management circuit and a battery, the power supply circuit is coupled to the second control circuit, the first RF communication circuit, the third control circuit, the second RF communication circuit, the first communication detection circuit, the second communication detection circuit, the first indication circuit, the second indication circuit, the switch state indication circuit and the charging management circuit, and is used to couple with the DC power supply, and the charging management circuit is coupled to the battery; wherein the power supply circuit receives a first DC signal provided by the DC power supply, converts the first DC signal into a second DC signal, and then outputs it to the second control circuit, the first RF communication circuit, the third control circuit, the second RF communication circuit, the first communication detection circuit, the second communication detection circuit, the first indication circuit, the second indication circuit and the switch state indication circuit; the charging management circuit receives the first DC signal provided by the DC power supply, and uses the first DC signal to charge the battery, or receives a third DC signal sent by the battery, and sends the third DC signal to the power supply circuit, so that the power supply circuit converts the first DC signal into a second DC signal.

[0010] Among them, the number of position detection circuits is at least two, and the position detection circuit includes a first resistor, a second resistor, a first capacitor, a second capacitor, a first bidirectional diode and a first RF detection sub-circuit; wherein, the first end of the first resistor is coupled to the first end of the second resistor, and is used to couple with the set level providing end, the second end of the first resistor is coupled to the first end of the first capacitor, the first end of the second capacitor and the third end of the first RF detection sub-circuit, the second end of the second resistor is coupled to the first end of the first RF detection sub-circuit, the first control circuit and the first end of the first bidirectional diode, the second end of the first capacitor is coupled to the second end of the second capacitor, the second end of the first RF detection sub-circuit and is grounded.

[0011] Wherein, the first radio frequency communication circuit includes a first radio frequency transmitting and receiving tube, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a first switch tube; wherein, the first end of the first radio frequency transmitting and receiving tube is used to couple with the setting level providing end, the second end of the first radio frequency transmitting and receiving tube is coupled with the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is coupled with the second end of the fourth resistor, the second end of the fifth resistor and the third end of the first switch tube, the first end of the fifth resistor is coupled with the first end of the sixth resistor and the tenth end of the second control circuit, the second end of the sixth resistor is coupled with the first end of the first switch tube, and the second end of the first switch tube is grounded; The first communication detection circuit includes a seventh resistor, an eighth resistor, a third capacitor, a fourth capacitor, a second bidirectional diode and a second RF detection sub-circuit; wherein, the first end of the seventh resistor is coupled to the first end of the eighth resistor and is used to couple to the set level providing end, the second end of the seventh resistor is coupled to the first end of the third capacitor, the first end of the fourth capacitor and the third end of the second RF detection sub-circuit, the second end of the eighth resistor is coupled to the first end of the second RF detection sub-circuit, the seventeenth end of the second control circuit and the first end of the second bidirectional diode, and the second end of the third capacitor is coupled to the second end of the fourth capacitor, the second end of the second RF detection sub-circuit and is grounded.

[0012] Wherein, the first indication circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second switch tube, a first light-emitting diode and a second light-emitting diode; wherein, the first end of the ninth resistor is used to couple with the set level providing end, the second end of the ninth resistor is coupled to the first end of the tenth resistor and the twentieth end of the second control circuit, the second end of the tenth resistor is coupled to the first end of the second switch tube, the second end of the second switch tube is grounded, the third end of the second switch tube is coupled to the first end of the eleventh resistor, the second end of the eleventh resistor is coupled to the first end of the first light-emitting diode, the second end of the first light-emitting diode is coupled to the second end of the second light-emitting diode, the first end of the second light-emitting diode is coupled to the first end of the twelfth resistor, and the The second end is coupled to the nineteenth end of the second control circuit; the second indication circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a third switch tube, a third light-emitting diode and a fourth light-emitting diode; wherein the first end of the thirteenth resistor is used to couple with the set level providing end, the second end of the thirteenth resistor is coupled to the first end of the fourteenth resistor and the twentieth end of the third control circuit, the second end of the fourteenth resistor is coupled to the first end of the second switch tube, the second end of the third switch tube is grounded, the third end of the third switch tube is coupled to the first end of the fifteenth resistor, the second end of the fifteenth resistor is coupled to the first end of the third light-emitting diode, the second end of the third light-emitting diode is coupled to the second end of the fourth light-emitting diode, and the first end of the fourth light-emitting diode is coupled to the second end of the fourth light-emitting diode. The first end of the fifth light emitting diode is coupled to the first end of the sixteenth resistor, and the second end of the sixteenth resistor is coupled to the nineteenth end of the third control circuit; the switch state indicating circuit includes a fifth light emitting diode, a sixth light emitting diode, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor and a twenty-second resistor; wherein the second end of the fifth light emitting diode is coupled to the second end of the sixth light emitting diode and is used to couple with the setting level providing end, the first end of the fifth light emitting diode is coupled to the first end of the seventeenth resistor, the second end of the seventeenth resistor is coupled to the third end of the fourth switch tube and the third end of the fifth switch tube, the second end of the fourth switch tube is grounded, and the first end of the fourth switch tube is connected to the ground. The first end of the nineteenth resistor is coupled, the second end of the nineteenth resistor is coupled to the fifteenth end of the second control circuit, the second end of the fifth switch tube is grounded, the first end of the fifth switch tube is coupled to the first end of the twentieth resistor, the second end of the twentieth resistor is coupled to the fifteenth end of the third control circuit, the second end of the eighteenth resistor is coupled to the third end of the sixth switch tube and the third end of the seventh switch tube, the second end of the sixth switch tube is grounded, the first end of the sixth switch tube is coupled to the first end of the twenty-first resistor, the second end of the twenty-first resistor is coupled to the thirteenth end of the second control circuit, the second end of the seventh switch tube is grounded, the first end of the seventh switch tube is coupled to the first end of the twenty-second resistor, and the second end of the twenty-second resistor is coupled to the thirteenth end of the third control circuit.

[0013] The power supply circuit includes a first diode, a second diode, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, an eighth switch tube and a first voltage conversion sub-circuit; wherein the first end of the first diode is coupled to the first end of the fifth capacitor, the first end of the sixth capacitor, and the second end of the second diode, and is used to couple with a DC power supply, the second end of the first diode is grounded, the second end of the fifth capacitor is grounded, the second end of the sixth capacitor is grounded, the first end of the second diode is coupled to the second end of the eighth switch tube, the first end of the seventh capacitor is coupled to the second end of the eighth switch tube, the first end of the eighth ... capacitor, the first end of the eighth capacitor is coupled to the second end of the eighth capacitor, the first end of the eighth capacitor is coupled to the second end of the eighth capacitor, the first end of the eighth capacitor is coupled to the second end of the eighth capacitor, the first end of the eighth capacitor is coupled to the second end of the eighth capacitor, the first end of the eighth capacitor is coupled to the second end of the eighth capacitor, the first end of the eighth capacitor is coupled to the second end of the eighth The first end of the eighth capacitor is coupled to the first end of the twenty-third resistor and the first end of the twenty-fourth resistor, the second end of the twenty-third resistor is grounded, the second end of the twenty-fourth resistor is used to couple with the DC power supply, the second end of the twenty-fifth resistor is coupled to the first end of the first voltage conversion sub-circuit, the first end of the twenty-sixth resistor is coupled to the first end of the twenty-seventh resistor and the fifth end of the first voltage conversion sub-circuit, the second end of the twenty-sixth resistor is coupled to the second end of the twenty-eighth resistor, the first end of the ninth capacitor, the first end of the tenth resistor, and the second end of the twenty-sixth resistor. The first end of the capacitor is coupled to the first end of the set level providing end, the second end of the twenty-seventh resistor is grounded, the third end of the first voltage conversion sub-circuit is coupled to the first end of the twenty-eighth resistor, the second end of the first voltage conversion sub-circuit is grounded, the second end of the ninth capacitor is grounded, and the second end of the tenth capacitor is grounded; the charging management circuit includes an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a twenty-ninth resistor, a thirtieth resistor, a seventh light-emitting diode and a second voltage conversion sub-circuit; wherein the first end of the eleventh capacitor is coupled to the first end of the twelfth capacitor and the first end of the twenty-ninth resistor and is grounded, the second end of the eleventh capacitor is coupled to the second end of the twelfth capacitor and the second voltage The fourth end of the conversion sub-circuit, the second end of the twenty-ninth resistor is coupled to the fifth end of the second voltage conversion sub-circuit, the second end of the seventh light-emitting diode is used to couple to a DC power supply, the first end of the seventh light-emitting diode is coupled to the first end of the thirtieth resistor, the second end of the thirtieth resistor is coupled to the first end of the second voltage conversion sub-circuit, the third end of the second voltage conversion sub-circuit is coupled to the first end of the thirteenth capacitor, the first end of the fourteenth capacitor, the second end of the battery and the third end of the eighth switch tube, the second end of the second voltage conversion sub-circuit is grounded, the second end of the thirteenth capacitor is grounded, the second end of the fourteenth capacitor is grounded, the first end of the battery is grounded, the third end of the battery is grounded, and the fourth end of the battery is grounded.

[0014] Among them, the position detection circuit is used to communicate with the network management terminal, and the position detection circuit receives the train station information and the corresponding preset image information sent by the network management terminal to generate a train station signal and a preset image signal; the first control circuit is also used to receive the train station signal and the preset image signal, generate a second image signal based on the train station signal and the preset image signal, and send the second image signal to the image projection circuit so that the image projection circuit can directionally project the train station information and the preset image information; and / or, the projection control circuit also includes a radio frequency digital tag, which is used to connect to the position detection circuit for short-range wireless communication, so that when the position detection circuit establishes a short-range wireless communication connection with the position detection circuit, the position detection circuit reads the tag information in the radio frequency digital tag to obtain the train station signal.

[0015] To solve the above technical problems, another technical solution adopted in the present application is: to provide a projection control method, which includes: obtaining a train station signal; generating a first image signal based on the train station signal; and directionally projecting the train station information according to the first image signal.

[0016] Among them, after the step of directionally projecting the train station information according to the first image signal, it also includes: obtaining train entry and exit signals; generating a light source control signal based on the train entry and exit signals; and turning on or off the directional projection of the train station information in response to the light source control signal.

[0017] To solve the above technical problems, another technical solution adopted in the present application is: to provide an electronic device, wherein the electronic device includes a shell and a projection control circuit connected to the shell; wherein the projection control circuit is the projection control circuit as described in any one of the above items.

[0018] The beneficial effect of the present application is as follows: Different from the prior art, the projection control circuit provided by the present application is specifically used in train tunnel image projection, the position detection circuit in the projection control circuit is used to obtain the train station signal, the first control circuit couples the position detection circuit and the image projection circuit to receive the train station signal sent by the position detection circuit, generates a first image signal based on the train station signal, and sends the first image signal to the image projection circuit, so that the image projection circuit directionally projects the train station information, so that the train station information can be displayed in the form of a projection screen, so as to significantly increase the display screen, thereby making it easier for passengers to be identified, avoiding the situation where passengers miss the station, and also facilitating better display of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0020] Figure 1 It is a structural schematic diagram of a first embodiment of the projection control circuit of the present application;

[0021] Figure 2 It is a structural schematic diagram of a second embodiment of the projection control circuit of the present application;

[0022] Figure 3 yes Figure 2 A schematic diagram of the structure of an embodiment of a position detection circuit in a projection control circuit;

[0023] Figure 4 yes Figure 2 A schematic diagram of the structure of an embodiment of a first radio frequency communication circuit in a projection control circuit;

[0024] Figure 5 yes Figure 2 A schematic structural diagram of an embodiment of a first communication detection circuit in a projection control circuit;

[0025] Figure 6 yes Figure 2 A schematic structural diagram of an embodiment of a first indication circuit in a projection control circuit;

[0026] Figure 7 yes Figure 2 A schematic structural diagram of an embodiment of a second indicating circuit in a projection control circuit;

[0027] Figure 8 yes Figure 2 A schematic diagram of the structure of an embodiment of a switch state indicating circuit in a projection control circuit;

[0028] Fig. 9 yes Figure 2 A schematic diagram of the structure of an embodiment of a power supply circuit in a projection control circuit;

[0029] Fig.10 yes Figure 2 A schematic diagram of the structure of an embodiment of a charging circuit in a projection control circuit;

[0030] Fig.11 yes Figure 2 A schematic diagram of the structure of an embodiment of a second radio frequency communication circuit in a projection control circuit;

[0031] Fig.12 yes Figure 2 A schematic diagram of the structure of an embodiment of a second communication detection circuit in a projection control circuit;

[0032] Fig.13 yes Figure 2 A schematic diagram of the structure of an embodiment of a switch circuit in a projection control circuit;

[0033] Fig.14 yes Figure 2 A schematic structural diagram of an embodiment of a second control circuit in a projection control circuit;

[0034] Fig.15 yes Figure 2 A schematic structural diagram of an embodiment of a third control circuit in a projection control circuit;

[0035] Fig.16 yes Figure 2 A schematic diagram of the structure of an embodiment of a program burning circuit 217 in a projection control circuit;

[0036] Fig.17 It is a structural schematic diagram of a third embodiment of the projection control circuit of the present application;

[0037] Fig.18 is a structural schematic diagram of a fourth embodiment of the projection control circuit of the present application;

[0038] Fig.19 It is a flowchart of the first implementation method of the projection control method of the present application;

[0039] Fig. 20 It is a flowchart of the second implementation mode of the projection control method of the present application;

[0040] Fig.21 It is a schematic diagram of the framework of an implementation scheme of the electronic device of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] The terms "first", "second" and "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the implementation mode of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0043] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0045] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of the first embodiment of the projection control circuit of the present application. In this embodiment, the projection control circuit 10 specifically includes: an image projection circuit 11, a position detection circuit 12 and a first control circuit 13.

[0046] Among them, a projection control circuit 10 provided in the present application is specifically used for train tunnel image projection, so as to utilize the idle subway tunnel wall and transform the dark tunnel wall into streaming media with station announcement display function and commercial and public welfare broadcasting. The arrival information is automatically and accurately displayed on the tunnel wall through the projection control circuit 10. The entire tunnel wall is not installed with electrical equipment and is only used as a reflective surface (screen).

[0047] Optionally, the train may specifically be a subway, an underground mining car or a train, or any other train with tunnels or walls in any reasonable itinerary, and the present application does not limit this.

[0048] The train tunnel wall has a projection reflective surface as long as the tunnel and is used as a projection screen. The projection reflective surface material adopts a weather-resistant paint that is resistant to peeling, yellowing, and scrubbable.

[0049] It is worth noting that the projection control circuit 10 can be specifically understood as a signal function circuit in a vehicle-mounted projector, so as to realize image projection control.

[0050] Among them, the function of the vehicle-mounted projector is to project video content onto the wall of the train tunnel. The video content includes vehicle arrival information and any other reasonable content used for commercial or public welfare, which is not limited in this application.

[0051] In addition, the vehicle-mounted projector can be specifically installed on the equipment layer above the window glass on both sides of each carriage of the train and other suitable positions, and the tunnel projection reflection surface and the window glass are at a corresponding height.

[0052] Specifically, the main function of the position detection circuit 12 is to identify the current station location of the train from the physical track or wireless signal to obtain the train station signal.

[0053] Among them, the position detection method can be implemented through a variety of technologies, for example, trackside beacon reading: using sensors on the train to read beacons installed along the track, such as RFID (Radio Frequency IDentification) tags, each beacon corresponds to a specific station location. GPS (Global Positioning System) positioning: On sections above the ground, GPS can assist in determining the location of the train, but due to factors such as tunnels, its role is limited when running underground. Track circuit detection: Utilizing the electrical and / or communication connection between the train and the track, different sections are identified through different circuit configurations, or specific coded signals sent by station communication devices installed near the train station are received to identify the station location. Image recognition: In some advanced systems, cameras and image processing technology are also used to identify specific platform markers.

[0054] Furthermore, the first control circuit 13 is coupled to the position detection circuit 12 and the image projection circuit 11 . After identifying the train position, the position detection circuit 12 sends this information, ie, the train station signal, to the first control circuit 13 .

[0055] The first control circuit 13 generates a corresponding first image signal according to the received train station signal. The first image signal includes information content that should be displayed inside and outside the train, such as the name of the next station, the arrival time, and any reasonable information content for commercial or public welfare corresponding to the current station, which is not limited in this application.

[0056] Among them, the image projection circuit 11 is used to receive the first image signal to project this information in a visually recognizable form, such as text, icon or video, onto a designated display area, i.e., the wall of the train tunnel, and / or a display screen outside the train, so that passengers waiting on the platform can also see it.

[0057] It is worth mentioning that since the on-board projector is installed on the train, the projected image display is synchronized with the train operation and is relatively static, and the running speed of the train does not affect the visual effect.

[0058] In addition, the term "coupled" herein refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or can be indirectly connected to the second circuit through other circuits or connection means.

[0059] Optionally, the first control circuit 13 may specifically include a DSP (Digital Signal Process), an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, a discrete hardware, or any other reasonable circuit unit with a signal processing function, and the present application does not limit this.

[0060] The above scheme displays the train station information in the form of a projection screen to significantly increase the display screen, making it easier for passengers to identify, avoiding the situation where passengers miss the station, and is also conducive to better display of the display screen. The projection control circuit 10 is easy to maintain, has low energy consumption, and has good commercial value, social benefits and economic benefits.

[0061] In addition, by displaying the station announcement information on the wall of the train tunnel throughout the entire process, passengers can see the arrival information ahead through the window glass at any time, because the information is displayed on the large screen of the train tunnel wall projected by the projection control circuit 10, wherein the screen size is equivalent to the size of the window glass, about 70 inches, thereby effectively solving the troubles caused to passengers by the font being too small or the inability to see the arrival information clearly because of being far away from the door. Passengers in any part of the car can see the station information at a glance by looking up.

[0062] See also Figure 2 , Figure 2The projection control circuit in this embodiment is different from the projection control circuit in the first embodiment provided by the present application in that the projection control circuit 20 further includes a light source control circuit 24 .

[0063] It is understandable that in order to avoid the strong projection light affecting the waiting passengers when the train enters the station, the projection light source needs to be automatically turned off when the train enters the station, that is, the current image projection is automatically paused, and the image projection is turned on again after the train exits the station and enters the tunnel.

[0064] Specifically, the light source control circuit 24 manages the brightness or switch status of the image projection to ensure that clear and visible train station information is provided at the appropriate time, while taking into account the needs of energy saving and passenger experience.

[0065] The light source control circuit 24 is coupled to the image projection circuit 21 and the first control circuit 23, and the position detection circuit 22 is used to monitor the train's entry and exit status in addition to detecting the train station location. When the train is about to enter or leave the station, it will generate specific entry and exit signals and transmit these signals to the first control circuit 23.

[0066] After receiving the entry and exit signals, the first control circuit 23 will generate corresponding light source control instructions according to the content of the signals. The light source control circuit 24, as an actuator, will parse these instructions and convert them into specific control signals after receiving the light source control instructions sent by the first control circuit 23. These signals may be commands to adjust the projection brightness, color, or directly turn on and off the projection light source.

[0067] Optionally, the light source control signal may specifically include turning off the projection light source or reducing the projection brightness, and turning on the projection light source or increasing the projection brightness, which is not limited in the present application.

[0068] The image projection circuit 21 receives the light source control signal sent by the light source control circuit 24 and adjusts its working state in real time. For example, when the train is about to enter the station or has entered the station, the light source control signal will correspond to turning off the projection light source or reducing the projection brightness, so as to automatically reduce the brightness or completely turn off the projection to avoid the strong projection light affecting the waiting passengers; and when the train has left the station and entered the train tunnel, the light source control signal will correspond to turning on the projection light source or enhancing the projection light source, so as to turn on the projection light source again for directional projection of the train station information.

[0069] In one embodiment, the projection control circuit 20 specifically also includes a second control circuit 25, a first RF communication circuit 26 and a setting switch circuit 27. The second control circuit 25 is coupled to the first RF communication circuit 26 and the setting switch circuit 27. The first RF communication circuit 26 is used for short-range wireless communication connection with the position detection circuit 22.

[0070] Optionally, the short-range wireless communication may specifically be one or more of Bluetooth communication, Wi-Fi (wireless network communication), StarFlash communication, infrared communication, RFID (Radio Frequency IDentification) communication and NFC (NearField Communication), and the present application does not limit this.

[0071] It can be understood that the position detection circuit 22 can specifically be a wireless or infrared signal receiving device integrated on the vehicle-mounted projector, and the first RF communication circuit 26 corresponds to an active wireless or infrared signal transmitting device, so that every time the train arrives near a wireless or infrared signal transmitting device with a pre-written position mark, when the distance between the two is reduced to a specific threshold range, the position detection circuit 22 can achieve a short-range wireless communication connection with the first RF communication circuit 26 to obtain the position information of the current position sent by the first RF communication circuit 26, that is, the train station signal and / or the train entry and exit signal, thereby controlling the projector to select the station information of the corresponding position and the film and television content related to the position to play.

[0072] The specific threshold range is the limit distance at which the first RF communication circuit 26 can achieve short-distance wireless communication connection with the position detection circuit 22. Different short-distance wireless communications correspond to different specific threshold ranges, which is not limited in this application.

[0073] In addition, the train station signal and train entry and exit signal can be specifically understood as information coding signals, so that after being sent to the position detection circuit 22, the information coding signal can be decoded by the position detection circuit 22 or the first control circuit 23 to obtain the current station information and entry and exit conditions.

[0074] Specifically, the second control circuit 25 is used to detect and set the switching state of the switching circuit 27, such as setting the level state on a specific terminal of the switching circuit 27, and / or setting the level state of the switching signal sent by the switching circuit 27, so as to control the first RF communication circuit 26 to send train station signals and / or train entry and exit signals in real time based on the currently acquired switching state.

[0075] It is worth noting that the train entry and exit signals can specifically include entry signals and exit signals, and the switch circuit 27 is set to have different switch states corresponding to the entry signal and exit signal, so that when the second control circuit 25 obtains the current switch state, it will send the train station signal, entry signal or exit signal to the first radio frequency communication circuit 26 in real time.

[0076] The position detection circuit 22 will receive the train station signal and / or the train entry and exit signal when establishing a short-range wireless communication connection with the radio frequency communication circuit.

[0077] It is worth noting that the second control circuit 25, the first radio frequency communication circuit 26 and the switch circuit 27 can be specifically integrated in a station communication device installed near each train station, and the point communication device can be specifically installed on the tunnel wall close to the train station, and two can be set on both sides of the train corresponding to the entry position, and two can be set on both sides of the train corresponding to the exit position.

[0078] Among them, the switch state of the switch circuit 27 corresponding to the station entry position set on both sides of the train can be specifically constant to the first switch state, and the first switch state corresponds to the station entry signal; and the switch state of the switch circuit 27 corresponding to the station exit position set on both sides of the train can be specifically constant to the second switch state, and the first switch state corresponds to the station exit signal. Therefore, when the train enters the station, the position detection circuit 22 will receive the train station signal and the station entry signal sent by the first radio frequency communication circuit 26; when the train enters the station, the position detection circuit 22 will receive the train station signal and the station exit signal sent by the first radio frequency communication circuit 26.

[0079] In one embodiment, the projection control circuit 20 specifically also includes a third control circuit 211, a second RF communication circuit 212, a first communication detection circuit 28 and a second communication detection circuit 213. The third control circuit 211 is coupled to the second RF communication circuit 212, the first communication detection circuit 28 and the second communication detection circuit 213. The second RF communication circuit 212 is coupled to the second communication detection circuit 213 and is used for short-range wireless communication connection with the position detection circuit 22. The first communication detection circuit 28 is coupled to the first RF communication circuit 26 and the third control circuit 211. The second communication detection circuit 213 is coupled to the second control circuit 25.

[0080] It is understandable that in order to prevent signal failure in the second control circuit 25 and / or the first RF communication circuit 26, the second control circuit 25 and the first RF communication circuit 26 can be backed up to add a third control circuit 211 and a second RF communication circuit 212. The third control circuit 211 and the second RF communication circuit 212 can be specifically understood as backups for the second control circuit 25 and the first RF communication circuit 26, and have the same circuit characteristics, in order to improve the stability and fault-tolerant processing capabilities of the system.

[0081] Optionally, the second control circuit 25 and the third control circuit 211 may specifically include any reasonable circuit unit with signal processing function, such as DSP, MCU circuit, CPU, single-chip microcomputer, field programmable gate array, programmable logic device, discrete gate or transistor logic device, discrete hardware, etc., and the present application does not limit this.

[0082] Among them, the first communication detection circuit 28 is used to detect the first signal transmission state of the first RF communication circuit 26, so as to send the first signal transmission state to the second control circuit 25 and the third control circuit 211; the second communication detection circuit 213 is used to detect the second signal transmission state of the second RF communication circuit 212, so as to send the second signal transmission state to the second control circuit 25 and the third control circuit 211; the second control circuit 25 is also used to select and control the first RF communication circuit 26 or the first RF communication circuit 26 to send the train station signal and / or the train entry and exit signal in real time according to the first signal transmission state and the second signal transmission state; and when a signal failure occurs in the second control circuit 25, the third control circuit 211 selects and controls the first RF communication circuit 26 or the first RF communication circuit 26 to send the train station signal and / or the train entry and exit signal in real time according to the first signal transmission state and the second signal transmission state.

[0083] Specifically, the first communication detection circuit 28 and the second communication detection circuit 213 will monitor the first signal transmission state and the second signal transmission state of the first RF communication circuit 26 and the second RF communication circuit 212 respectively, and feed back to the second control circuit 25 and the third control circuit 211 in real time respectively. The second control circuit 25 decides to use the first RF communication circuit 26 or the second RF communication circuit 212 to send the train station information and / or the train entry and exit signal based on the first and second signal transmission states. This mechanism ensures that when any single communication path fails or is inefficient, the system can seamlessly switch to the best path, maintain continuous transmission of information, and realize fault backup control. If the second control circuit 25 fails, the third control circuit 211 is immediately enabled, and according to the received first and second signal transmission state indications, it also makes a choice to control the first RF communication circuit 26 or the first RF communication circuit 26 to send the train station signal and / or the train entry and exit signal in real time, ensuring that wireless communication is not interrupted and the train information is continuously and accurately projected.

[0084] In another embodiment, the position detection circuit 22 is also used to communicate with the network management terminal, and the position detection circuit 22 is used to receive the train station information and the corresponding preset image information sent by the network management terminal, so as to generate the train station signal and the preset image signal accordingly, and to receive the train entry and exit signal sent by the first RF communication circuit 26 or the second RF communication circuit 212 accordingly, so as to reduce the signal transmission difficulty and the amount of information transmitted by the first RF communication circuit 26 or the second RF communication circuit 212, and avoid the short time for the position detection circuit 22 to realize short-distance wireless communication with the first RF communication circuit 26 or the second RF communication circuit 212, resulting in signal reception failure.

[0085] Among them, the first control circuit 23 is also used to receive the train station signal and the preset image signal sent by the position detection circuit 22, to generate a first image signal based on the train station signal and the preset image signal, and to send the first image signal to the image projection circuit 21, so that the image projection circuit 21 can directionally project the train station information.

[0086] It is worth noting that the network management terminal can be specifically understood as any reasonable intelligent terminal such as a vehicle information network system, a cloud management server or a background computer, which is used to send train station signals and preset image signals to the position detection circuit 22, and the corresponding image projection circuit 21 directional projects the train station information machine and other any reasonable content for commercial or public welfare. This application does not limit this.

[0087] In addition, the image projection circuit 21 can specifically display the vehicle arrival information at the top of the projection screen, while the other display areas are used to display other contents such as commercial or public welfare, etc. The image projection circuit 21 is also used for picture correction, machine anti-high frequency vibration, heat dissipation, etc.

[0088] In one embodiment, the projection control circuit 20 specifically also includes a first indication circuit 29, a second indication circuit 214 and a switch status indication circuit 210, the first indication circuit 29 is coupled to the second control circuit 25, the second indication circuit 214 is coupled to the third control circuit 211, and the switch status indication circuit 210 is coupled to the second control circuit 25 and the third control circuit 211.

[0089] In the design of the projection control circuit 20, the integrated indication circuit system not only realizes the visual monitoring of the operating status and the switch status, but also enhances the transparency and maintenance convenience of the system. The first indication circuit 29 is used to activate the corresponding indicator light according to the first operating status signal (such as normal operation, standby, fault, standby, etc.) sent by the second control circuit 25. It will emit a first light signal (green light, red light or other colors) to intuitively reflect the operating status of the system, which is convenient for on-site personnel to identify. The second indication circuit 214 assumes a similar function, but for the second operating status signal of the third control circuit 211. Depending on the state, it can also emit a first light signal or a second light signal to provide instant feedback for the state of another system part, which is helpful for understanding control and troubleshooting.

[0090] The switch status indication circuit 210 is quite special. It receives the first switch signal of the second control circuit 25 and the second switch signal of the third control circuit 211 at the same time. It is intended to give a clear prompt when there is a switch action (open, close, switch) in the system, and based on the received switch signal combination, it sends a third light signal or a fourth light signal to further indicate whether the switch action is successful or abnormal, adding an operation confirmation link and improving the reliability of control. The entire indication system design converts the operating status and switch action of complex circuits into intuitive visual feedback through the logic of light signals, which not only facilitates operator monitoring and maintenance, but also improves the overall controllability and safety of the system, especially in rapid response and troubleshooting, it can quickly locate the problem.

[0091] It is worth noting that the first optical signal can specifically be green light, and the second optical signal corresponds to red light. When the first indicator circuit 29 displays green light, it can indicate that the second control circuit 25 is operating normally; and when the first indicator circuit 29 displays red light, it can indicate that a signal failure occurs in the second control circuit 25.

[0092] In addition, the third optical signal can specifically be green light, and the fourth optical signal can specifically correspond to red light, and can specifically correspond to the current switch state of the switch circuit 27, so as to correspond to the train entry signal and the train exit signal, respectively, so that when the switch state indication circuit 210 displays green light, it can indicate that the train is entering the station; and when the switch state indication circuit 210 displays red light, it can indicate that the train is leaving the station.

[0093] The second switch signal sent by the third control circuit 211 can be understood as a backup in case a signal failure occurs in the second control circuit 25 .

[0094] In other embodiments, the first optical signal / third optical signal may be any reasonable color light such as white or blue light, and the second optical signal / fourth optical signal may be any reasonable color light such as yellow or orange light, and the present application does not limit this.

[0095] Furthermore, in one embodiment, the projection control circuit 20 specifically also includes a power supply circuit 215 and a charging circuit 216, the charging circuit 216 includes a charging management circuit and a battery BAT1, the power supply circuit 215 is coupled to the second control circuit 25, the first RF communication circuit 26, the third control circuit 211, the second RF communication circuit 212, the first communication detection circuit 28, the second communication detection circuit 213, the first indication circuit 29, the second indication circuit 214, the switch state indication circuit 210 and the charging management circuit, and is used to couple with a DC power supply, and the charging management circuit is coupled to the battery BAT1.

[0096] Among them, the power supply circuit 215 receives the first DC signal provided by the DC power supply, converts the first DC signal into a second DC signal, and outputs it to the second control circuit 25, the first RF communication circuit 26, the third control circuit 211, the second RF communication circuit 212, the first communication detection circuit 28, the second communication detection circuit 213, the first indication circuit 29, the second indication circuit 214 and the switch state indication circuit 210; the charging management circuit receives the first DC signal provided by the DC power supply, and uses the first DC signal to charge the battery BAT1, or receives the third DC signal sent by the battery BAT1, and sends the third DC signal to the power supply circuit 215, so that the power supply circuit 215 converts the first DC signal into the second DC signal.

[0097] Specifically, the power supply circuit 215 serves as a core power supply unit, which receives a first DC signal from a DC power supply, performs conversion processing, and generates a second DC signal. The second DC signal provides stable power for the key parts of the entire system, including the second control circuit 25, the radio frequency communication circuit, the third control circuit 211, the second radio frequency communication circuit 212, the communication detection circuit, the second communication detection circuit 213, the first indication circuit 29, the second indication circuit 214, and the switch state indication circuit 210, to ensure the operation of each component.

[0098] The charging management circuit is directly connected to the battery BAT1 and has dual functions. On the one hand, it receives a first DC signal from a DC power source, charges the battery BAT1, manages the charging and discharging process, and ensures that the battery BAT1 is safe, efficient, and has a longer life. On the other hand, when the battery BAT1 is full or the battery BAT1 is discharging, the charging management circuit can receive a third DC signal from the battery BAT1 and transmit this signal to the power circuit 215, which then converts the first DC signal into a second DC signal through the power circuit 215 to maintain system power supply.

[0099] In one embodiment, the projection control circuit 20 specifically also includes a program burning circuit 217, which is coupled to the second control circuit 25 and the third control circuit 211 to receive program control instructions input by a user so as to set or update the control program in the second control circuit 25 and / or the third control circuit 211 based on the program control instructions.

[0100] Please continue reading Figure 3 , Figure 3 yes Figure 2 A structural diagram of an embodiment of a position detection circuit in a projection control circuit.

[0101] In one embodiment, the number of the position detection circuits 22 can be at least two to synchronously perform position detection, that is, synchronously receive the train station signal and / or train entry and exit signal sent by the first RF communication circuit 26 or the second RF communication circuit 212.

[0102] Specifically, the position detection circuit 22 includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a first bidirectional diode ESD1 and a first RF detection sub-circuit DIR1; wherein, the first end of the first resistor R1 is coupled to the first end of the second resistor R2, and is used to couple to the set level providing end 3V3-STB, the second end of the first resistor R1 is coupled to the first end of the first capacitor C1, the first end of the second capacitor C2 and the third end of the first RF detection sub-circuit DIR1, the second end of the second resistor R2 is coupled to the first end of the first RF detection sub-circuit DIR1, the first control circuit 23 and the first end of the first bidirectional diode ESD1, the second end of the first capacitor C1 is coupled to the second end of the second capacitor C2, the second end of the first RF detection sub-circuit DIR1 and is grounded.

[0103] Please continue reading Figure 4 , Figure 4 yes Figure 2 A schematic structural diagram of an embodiment of a first radio frequency communication circuit in a projection control circuit.

[0104] In one embodiment, the first RF communication circuit 26 includes a first RF transmitting and receiving tube IR1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first switch tube Q1; wherein, the first end of the first RF transmitting and receiving tube IR1 is used to couple with the set level providing end 3V3-STB, the second end of the first RF transmitting and receiving tube IR1 is coupled to the first end of the third resistor R3 and the first end of the fourth resistor R4, the second end of the third resistor R3 is coupled to the second end of the fourth resistor R4, the second end of the fifth resistor R5 and the third end of the first switch tube Q1, the first end of the fifth resistor R5 is coupled to the first end of the sixth resistor R6 and the tenth end of the second control circuit 25, the second end of the sixth resistor R6 is coupled to the first end of the first switch tube Q1, and the second end of the first switch tube Q1 is grounded.

[0105] Please continue reading Figure 5 , Figure 5 yes Figure 2 A structural diagram of an embodiment of a first communication detection circuit in a projection control circuit.

[0106] In one embodiment, the first communication detection circuit 28 includes a seventh resistor R7, an eighth resistor R8, a third capacitor C3, a fourth capacitor C4, a second bidirectional diode ESD2 and a second RF detection sub-circuit DIR2; wherein, the first end of the seventh resistor R7 is coupled to the first end of the eighth resistor R8, and is used to couple to the set level providing end 3V3-STB, the second end of the seventh resistor R7 is coupled to the first end of the third capacitor C3, the first end of the fourth capacitor C4 and the third end of the second RF detection sub-circuit DIR2, the second end of the eighth resistor R8 is coupled to the first end of the second RF detection sub-circuit DIR2, the seventeenth end of the second control circuit 25 and the first end of the second bidirectional diode ESD2, the second end of the third capacitor C3 is coupled to the second end of the fourth capacitor C4, the second end of the second RF detection sub-circuit DIR2 and is grounded.

[0107] Please continue reading Figure 6 , Figure 6 yes Figure 3 yes Figure 2 A structural schematic diagram of an embodiment of a first indication circuit in a projection control circuit.

[0108] In one embodiment, the first indication circuit 29 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second switch tube Q2, a first light-emitting diode LED1 and a second light-emitting diode LED2; wherein, a first end of the ninth resistor R9 is used to couple with the set level providing end 3V3-STB, a second end of the ninth resistor R9 is coupled to a first end of the tenth resistor R10 and a twentieth end of the second control circuit 25, a second end of the tenth resistor R10 is coupled to a first end of the second switch tube Q2, a second end of the second switch tube Q2 is grounded, a third end of the second switch tube Q2 is coupled to a first end of the eleventh resistor R11, a second end of the eleventh resistor R11 is coupled to a first end of the first light-emitting diode LED1, a second end of the first light-emitting diode LED1 is coupled to a second end of the second light-emitting diode LED2, a first end of the second light-emitting diode LED2 is coupled to a first end of the twelfth resistor R12, and a second end of the twelfth resistor R12 is coupled to a nineteenth end of the second control circuit 25.

[0109] Please continue reading Figure 7 , Figure 7 yes Figure 2 A structural schematic diagram of an embodiment of a second indication circuit in a projection control circuit.

[0110] In one embodiment, the second indication circuit 214 includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a third switch tube Q3, a third light-emitting diode LED3 and a fourth light-emitting diode LED4; wherein, the first end of the thirteenth resistor R13 is used to couple with the set level providing end 3V3-STB, the second end of the thirteenth resistor R13 is coupled to the first end of the fourteenth resistor R14 and the twentieth end of the third control circuit 211, the second end of the fourteenth resistor R14 is coupled to the first end of the second switch tube Q2, the second end of the third switch tube Q3 is grounded, the third end of the third switch tube Q3 is coupled to the first end of the fifteenth resistor R15, the second end of the fifteenth resistor R15 is coupled to the first end of the third light-emitting diode LED3, the second end of the third light-emitting diode LED3 is coupled to the second end of the fourth light-emitting diode LED4, the first end of the fourth light-emitting diode LED4 is coupled to the first end of the sixteenth resistor R16, and the second end of the sixteenth resistor R16 is coupled to the nineteenth end of the third control circuit 211.

[0111] Please continue reading Figure 8 , Figure 8 yes Figure 2 A structural schematic diagram of an embodiment of a switch state indication circuit in a projection control circuit.

[0112] In one embodiment, the switch state indicating circuit 210 includes a fifth light emitting diode LED5, a sixth light emitting diode LED6, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21 and a twenty-second resistor R22; wherein, the second end of the fifth light emitting diode LED5 is coupled to the second end of the sixth light emitting diode LED6, and is used to couple with the setting level providing end 3V3-STB, the first end of the fifth light emitting diode LED5 is coupled to the first end of the seventeenth resistor R17, the second end of the seventeenth resistor R17 is coupled to the third end of the fourth switch tube Q4 and the third end of the fifth switch tube Q5, the second end of the fourth switch tube Q4 is grounded, the first end of the fourth switch tube Q4 is coupled to the nineteenth resistor R19, and the second end of the fourth switch tube Q4 is grounded. The first end of the resistor R19, the second end of the nineteenth resistor R19 is coupled to the fifteenth end of the second control circuit 25, the second end of the fifth switch tube Q5 is grounded, the first end of the fifth switch tube Q5 is coupled to the first end of the twentieth resistor R20, the second end of the twentieth resistor R20 is coupled to the fifteenth end of the third control circuit 211, the second end of the eighteenth resistor R18 is coupled to the third end of the sixth switch tube Q6 and the third end of the seventh switch tube Q7, the second end of the sixth switch tube Q6 is grounded, the first end of the sixth switch tube Q6 is coupled to the first end of the twenty-first resistor R21, the second end of the twenty-first resistor R21 is coupled to the thirteenth end of the second control circuit 25, the second end of the seventh switch tube Q7 is grounded, the first end of the seventh switch tube Q7 is coupled to the first end of the twenty-second resistor R22, and the second end of the twenty-second resistor R22 is coupled to the thirteenth end of the third control circuit 211.

[0113] Please continue reading Fig. 9 , Fig. 9 yes Figure 2 A schematic structural diagram of an embodiment of a power supply circuit in a projection control circuit.

[0114] In one embodiment, the power circuit 215 includes a first diode D1, a second diode D2, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, an eighth switch tube Q8, and a first voltage conversion sub-circuit ZH1; wherein a first end of the first diode D1 is coupled to a first end of the fifth capacitor C5, a first end of the sixth capacitor C6, and a second end of the second diode D2, and is used to couple with a DC power source (not shown in the figure), a second end of the first diode D1 is grounded, a second end of the fifth capacitor C5 is grounded, a second end of the sixth capacitor C6 is grounded, a first end of the second diode D2 is coupled to a second end of the eighth switch tube Q8, a first end of the seventh capacitor C7, a first end of the eighth capacitor C8, a first end of the twenty-fifth resistor R25, and a fourth end of the first voltage conversion sub-circuit ZH1, and a seventh capacitor C8 is coupled to a first end of the eighth capacitor C8, a first end of the eighth capacitor C8, a first end of the twenty-fifth resistor R25, and a fourth end of the first voltage conversion sub-circuit ZH1. The second end of the capacitor C7 is grounded, the second end of the eighth capacitor C8 is grounded, the first end of the eighth switch tube Q8 is coupled to the first end of the twenty-third resistor R23 and the first end of the twenty-fourth resistor R24, the second end of the twenty-third resistor R23 is grounded, the second end of the twenty-fourth resistor R24 ​​is used to couple with the DC power supply, the second end of the twenty-fifth resistor R25 is coupled to the first end of the first voltage conversion sub-circuit ZH1, the first end of the twenty-sixth resistor R26 is coupled to the first end of the twenty-seventh resistor R27 and the fifth end of the first voltage conversion sub-circuit ZH1, the second end of the twenty-sixth resistor R26 is coupled to the second end of the twenty-eighth resistor R28, the first end of the ninth capacitor C9, and the first end of the tenth capacitor C10, and is used to couple with the set level providing terminal 3V3-STB, the second end of the twenty-seventh resistor R27 is grounded, the third end of the first voltage conversion sub-circuit ZH1 is coupled to the first end of the twenty-eighth resistor R28, the second end of the first voltage conversion sub-circuit ZH1 is grounded, the second end of the ninth capacitor C9 is grounded, and the second end of the tenth capacitor C10 is grounded.

[0115] Please continue reading Fig.10 , Fig.10 yes Figure 2 A schematic structural diagram of an embodiment of a charging circuit in a projection control circuit.

[0116] In one embodiment, the charging management circuit (not shown) includes an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a twenty-ninth resistor R29, a thirtieth resistor R30, a seventh light-emitting diode LED7, and a second voltage conversion sub-circuit ZH2; wherein a first end of the eleventh capacitor C11 is coupled to a first end of the twelfth capacitor C12, a first end of the twenty-ninth resistor R29 and grounded, a second end of the eleventh capacitor C11 is coupled to a second end of the twelfth capacitor C12, a fourth end of the second voltage conversion sub-circuit ZH2, a second end of the twenty-ninth resistor R29 is coupled to a fifth end of the second voltage conversion sub-circuit ZH2, and the seventh light-emitting diode L The second end of ED7 is used to couple to a DC power supply, the first end of the seventh light emitting diode LED7 is coupled to the first end of the thirtieth resistor R30, the second end of the thirtieth resistor R30 is coupled to the first end of the second voltage conversion sub-circuit ZH2, the third end of the second voltage conversion sub-circuit ZH2 is coupled to the first end of the thirteenth capacitor C13, the first end of the fourteenth capacitor C14, the second end of the battery BAT1 and the third end of the eighth switch tube Q8, the second end of the second voltage conversion sub-circuit ZH2 is grounded, the second end of the thirteenth capacitor C13 is grounded, the second end of the fourteenth capacitor C14 is grounded, the first end of the battery BAT1 is grounded, the third end of the battery BAT1 is grounded, and the fourth end of the battery BAT1 is grounded.

[0117] Please continue reading Figure 11-Figure 16 ,in, Fig.11 yes Figure 2 A schematic diagram of the structure of an embodiment of a second radio frequency communication circuit in a projection control circuit, Fig.12 yes Figure 2 A schematic diagram of the structure of an embodiment of a second communication detection circuit in a projection control circuit, Fig.13 yes Figure 2 A schematic diagram of the structure of an embodiment of a switch circuit in a projection control circuit, Fig.14 yes Figure 2 A schematic diagram of the structure of an embodiment of a second control circuit in a projection control circuit, Fig.15 yes Figure 2 A schematic diagram of the structure of an embodiment of a third control circuit 1 in a projection control circuit, Fig.16 yes Figure 2 A structural diagram of an embodiment of a program burning circuit in a projection control circuit.

[0118] It can be understood that, in some specific embodiments, the second RF communication circuit 212 specifically also includes a second RF transmitting and receiving tube IR2, a 30th resistor R30, a 31st resistor R31, a 32nd resistor R32, a 33rd resistor R33 and a ninth switch tube Q9; the second communication detection circuit 213 specifically also includes a 34th resistor R34, a 35th resistor R35, a 15th capacitor C15, a 16th capacitor C16, a third bidirectional diode ESD3 and a third RF detection sub-circuit DIR3; the setting switch circuit 27 includes an adjustable switch SW1, a 36th resistor R36, and a 37th resistor R37; the second control circuit 25 includes a first microprocessor circuit U1, a 38th resistor R38, a 39th resistor R39, a 40th resistor R40, a 41st resistor R41, a 42nd resistor R42, a 43rd resistor R43, a 44th resistor R44, a 45th resistor R45, a 46th resistor R46, a 47th resistor R47, a 48th resistor R48, a 49th resistor R49, a 50th resistor R40, a 51st resistor R41, a 52nd resistor R42, a 53th resistor R43, a 54th resistor R44, a 55th resistor R45 Forty resistor R40, forty-first resistor R41, forty-second resistor R42, forty-third resistor R43, forty-fourth resistor R44, forty-fifth resistor R45, forty-sixth resistor R46, forty-seventh resistor R47, seventeenth capacitor C17, eighteenth capacitor C18; the third control circuit 211 includes a second micro-processing circuit U2, a forty-eighth resistor R48, a forty-ninth resistor R49, a fiftieth resistor R50, a fifty-first resistor R51, a fifty-second resistor R52, a fifty-third resistor R53, a fifty-fourth resistor R54, a nineteenth capacitor C19, and a twentieth capacitor C20; the program burning circuit 217 specifically includes a connecting terminal J20, a twenty-first capacitor C21, a fifty-fifth resistor R55, and a fifty-sixth resistor R56.

[0119] It is worth noting that the circuit architecture of the second RF communication circuit 212 and the second communication detection circuit 213 is respectively the same as that of the first RF communication circuit 26 and the first communication detection circuit 28. The circuit connection relationship and corresponding signal feedback of the second RF communication circuit 212, the second communication detection circuit 213, the setting switch circuit 27, the second control circuit 25, the third control circuit 211 and the program burning circuit 217 are as follows: Figure 11-Figure 16 As shown, no further description is given here.

[0120] In addition, each switch tube in this article can specifically be a thin film transistor, a MOS (Metal Oxide Semiconductor Field Effect Transistor), a triode, a field effect transistor or any other reasonable switch tube, and this application does not limit this.

[0121] Among them, the first end of each switch tube is correspondingly connected to the second control circuit 25 or the third control circuit 211, so as to receive the corresponding driving signal sent by the second control circuit 25 or the third control circuit 211, and under the action of the driving signal, trigger the conduction or shutdown of its second end and the third end.

[0122] The first RF detection subcircuit DIR1, the second RF detection subcircuit DIR2 and the third RF detection subcircuit DIR3 are used to detect whether the transmission and reception of the corresponding RF signal are normal; the first RF transmitting and receiving tube IR1 and the second RF transmitting and receiving tube IR2 are used to send the corresponding RF signal; the first light-emitting diode LED1 and the second light-emitting diode LED2 are used to send the first light signal and the second light signal respectively, and specifically, when the second switch tube Q2 receives the first drive signal sent by the second control circuit 25, it is triggered to turn on so that the first light-emitting diode LED1 sends the first light signal, and when the second switch tube Q2 receives the second drive signal sent by the second control circuit 25, it is triggered to turn off so that the second light-emitting diode LED2 sends the second light signal; the third light-emitting diode LED3 and the fourth light-emitting diode LED4 are used to send the first light signal and the second light signal respectively, and specifically, when the third switch tube Q3 receives the third control circuit 25, it is triggered to turn off so that the second light-emitting diode LED2 sends the second light signal. When the fourth switch tube Q4 receives the first drive signal sent by the second control circuit 211, it is triggered to turn on so that the third light-emitting diode LED3 emits a first light signal, and when the fourth switch tube Q4 receives the second drive signal sent by the third control circuit 211, it is triggered to turn off so that the fourth light-emitting diode LED4 emits a second light signal; the fifth light-emitting diode LED5 and the sixth light-emitting diode LED6 are respectively used to emit a third light signal and a fourth light signal, and specifically, when the fourth switch tube Q4 receives the third drive signal sent by the second control circuit 25, or the fifth switch tube Q5 receives the third drive signal sent by the third control circuit 211, it is triggered to turn on so that the fifth light-emitting diode LED5 emits a third light signal, and when the sixth switch tube Q6 receives the fourth drive signal sent by the second control circuit 25, and the seventh switch tube Q7 receives the fourth drive signal sent by the third control circuit 211, it is triggered to turn off so that the second light-emitting diode LED2 emits a fourth light signal.

[0123] Furthermore, the first DC signal provided by the DC power supply may be specifically DC (direct current) 5V, and the set level providing terminal 3V3-STB may be specifically a 3.3V voltage providing terminal, and may be specifically obtained by voltage transformation using the first DC signal by the first voltage conversion subcircuit ZH1 and / or the second voltage conversion subcircuit ZH2. The power supply circuit 215 may also specifically have a built-in DC 5V DC source BAT2 as a replacement or supplement for the DC power supply.

[0124] The adjustable switch SW1 has a first end, a second end and a third end, and the second end can be connected to the first end or the third end to send different switch signals to the second control circuit 25 to correspond to the train entry signal and the train exit signal respectively.

[0125] It is understandable that the switch circuit 27 set near the entrance to the station and the switch circuit 27 set near the exit to the station have different switch states, so that they can be recognized by the second control circuit 25 and send a train entry signal or a train exit signal to the position detection circuit 22 via the first RF communication circuit 26 or the second RF communication circuit 212.

[0126] It is worth noting that the second control circuit 25, the first RF communication circuit 26, the switch circuit 27, the third control circuit 211, the second RF communication circuit 212, the first communication detection circuit 28, the second communication detection circuit 213, the first indication circuit 29, the second indication circuit 214, the switch state indication circuit 210, the power supply circuit 215 and the charging circuit 216 can be specifically integrated in a station communication device installed near each train station, and the point communication device can be specifically installed on the tunnel wall close to the train station, and two are set on both sides of the train corresponding to the entry position, and two are set on both sides of the train corresponding to the exit position.

[0127] Furthermore, the first control circuit 23, the position detection circuit 22 and the image projection circuit 21 are integrated in the vehicle-mounted projector so as to be able to cooperate with the station communication device to effectively realize the train tunnel image projection.

[0128] See also Fig.17 , Fig.17 The projection control circuit in this embodiment differs from the projection control circuit in the first embodiment provided by the present application in that the position detection circuit 32 in the projection control circuit 30 is used for communication connection with the network management terminal 102 .

[0129] Specifically, the position detection circuit 32 is used to receive the train station information and the corresponding preset image information sent by the network management terminal 102, so as to generate the train station signal and the preset image signal accordingly.

[0130] The first control circuit 33 is also used to receive the train station signal and the preset image signal, and generate a second image signal based on the train station signal and the preset image signal, and send the second image signal to the image projection circuit 31 so that the image projection circuit 31 directionally projects the train station information and the preset image information.

[0131] Furthermore, in one embodiment, the network management terminal 102 may specifically be a vehicle information network system, so as to be able to monitor the entry and exit of trains in real time, and send corresponding train entry and exit signals to the position detection circuit 32.

[0132] It is understandable that the network port of the vehicle-mounted projector is coupled to the vehicle information network system. Whenever the train arrives at a location, the vehicle-mounted projector can obtain the train location information from the vehicle information network system to control the projection control circuit 30 to display different station information and video content related to the location.

[0133] The projection control circuit 30 specifically also includes a light source control circuit, which is connected to the image projection circuit 31 and the first control circuit 33. The position detection circuit 32 is also used to obtain the train entry and exit signals sent by the network management terminal, and send the train entry and exit signals to the first control circuit 33, so that the first control circuit 33 sends a light source control instruction to the light source control circuit based on the train entry and exit signals; the light source control circuit is also used to receive the light source control instruction, and send the light source control signal to the image projection circuit 31 based on the light source control instruction, so that the image projection circuit 31 responds to the light source control signal to turn on or off the directional projection of the train station information.

[0134] See also Fig.18 , Fig.18 The projection control circuit in this embodiment is different from the projection control circuit in the first embodiment provided by the present application in that the projection control circuit 40 further includes a radio frequency digital tag 44 .

[0135] In one embodiment, the projection control circuit 40 specifically also includes a radio frequency digital tag 44, which is used to establish a short-range wireless communication connection with the position detection circuit 42, and the position detection circuit 42 can specifically be an RFID code reading circuit, so that when the position detection circuit 42 establishes a short-range wireless communication connection with the position detection circuit 42, the position detection circuit 42 is used to read the tag information in the radio frequency digital tag 44 to obtain the train station signal.

[0136] The first control circuit 43 receives the train station signal sent by the position detection circuit 42, generates a first image signal based on the train station signal, and sends the first image signal to the image projection circuit 41, so that the image projection circuit 41 directionally projects the train station information.

[0137] It is understandable that an RFID reading circuit can be installed inside the vehicle-mounted projector, and a passive RFID can be installed near each train station as a position signal identification tag, so that every time the train arrives near an RFID with a pre-written position mark, the current position information can be read, thereby controlling the projector to select the station information of the corresponding location and the film and television content related to the location to play.

[0138] This application also specifically adopts a projection control method, see Fig.19 , Fig.19 This is a flowchart of the first embodiment of the projection control method of the present application. Specifically, it may include the following steps:

[0139] S51: Acquire train station signal.

[0140] It is understandable that the projection control method in this embodiment is specifically a method for implementing projection control corresponding to a projection control circuit applied to train tunnel image projection. The projection control circuit specifically includes an image projection circuit, a position detection circuit, and a first control circuit, and the first control circuit is coupled to the position detection circuit and the image projection circuit.

[0141] Specifically, the position detection circuit is used to identify the station location where the train is currently located from the physical track or wireless signal to obtain the train station signal.

[0142] Position detection methods can be implemented through a variety of technologies, for example, trackside beacon reading: using sensors on the train to read beacons installed along the track, such as RFID (Radio Frequency IDentification) tags, each beacon corresponds to a specific station location. GPS (Global Positioning System) positioning: On sections above the ground, GPS can assist in determining the location of the train, but due to factors such as tunnels, its role is limited when running underground. Track circuit detection: Using the electrical and / or communication connection between the train and the track, different sections are identified through different circuit configurations, or specific coded signals sent by station communication devices installed near the train station are received to identify the station location. Image recognition: In some advanced systems, cameras and image processing technology are also used to identify specific platform landmarks.

[0143] S52: Generate a first image signal based on the train station signal.

[0144] The first control circuit receives the train station signal sent by the position detection circuit, and generates a corresponding first image signal according to the received train station signal. The first image signal includes information content that should be displayed inside and outside the train, such as the name of the next station, the arrival time, and any reasonable information content corresponding to the current station for commercial or public welfare, which is not limited in this application.

[0145] S53: Directionally projecting train station information according to the first image signal.

[0146] The image projection circuit is used to receive the first image signal to project this information in a visually recognizable form, such as text, icon or video, onto a designated display area, i.e., the wall of a train tunnel, and / or a display screen outside the train, so that passengers waiting on the platform can also see it.

[0147] See also Fig. 20 , Fig. 20 : is a flow chart of the second embodiment of the projection control method of the present application. The projection control method of this embodiment is Fig.19 A flowchart of a detailed implementation of the projection control method in the embodiment of the present invention specifically includes the following steps:

[0148] S51: Acquire train station signal.

[0149] S52: Generate a first image signal based on the train station signal.

[0150] S53: Directionally projecting train station information according to the first image signal.

[0151] Among them, S51, S52, S53 and S54 are Figure 6 S41, S42, S43 and S44 are the same. Please refer to S41, S42, S43 and S44 and their related text descriptions for details, which will not be repeated here.

[0152] S54: Obtain train entry and exit signals.

[0153] It is understandable that in order to avoid the strong projection light affecting the waiting passengers when the train enters the station, the projection light source needs to be automatically turned off when the train enters the station, that is, the current image projection is automatically paused, and the image projection is turned on again after the train exits the station and enters the tunnel.

[0154] Specifically, the projection control circuit also includes a light source control circuit, which is coupled to the image projection circuit and the first control circuit. The light source control circuit manages the brightness or switching state of the image projection to ensure that clear and visible train station information is provided at the appropriate time, while taking into account the needs of energy saving and passenger experience.

[0155] The position detection circuit is used to monitor the train's station position and the train's entry and exit status. When the train is about to enter or leave the station, it will generate specific entry and exit signals and transmit these signals to the first control circuit.

[0156] S55: Generate a light source control signal based on the train entry and exit signal.

[0157] After receiving the entry and exit signals, the first control circuit will generate corresponding light source control instructions according to the content of the signals. The light source control circuit, as an actuator, will parse these instructions and convert them into specific light source control signals after receiving the light source control instructions sent by the first control circuit. These signals may be commands to adjust the projection brightness, color, or directly turn on and off the projection light source.

[0158] S56: Turn on or off the directional projection of the train station information in response to the light source control signal.

[0159] The image projection circuit receives the light source control signal sent by the light source control circuit and adjusts its working state in real time. For example, when the train is about to enter the station or has entered the station, the light source control signal will correspond to turning off the projection light source or reducing the projection brightness, so as to automatically reduce the brightness or completely turn off the projection to avoid the strong projection light affecting the waiting passengers; and when the train has left the station and entered the train tunnel, the light source control signal will correspond to turning on the projection light source or enhancing the projection light source, so as to turn on the projection light source again for directional projection of train station information.

[0160] It is understandable that, in some other embodiments, the projection control circuit specifically includes some other more specific circuit units to be able to implement other more specific projection control methods. For details, please refer to Figure 1-Figure 18 And related text descriptions will not be repeated here.

[0161] This application also specifically uses an electronic device, see Fig.21 , Fig.21 Schematic diagram of the framework of an electronic device of the present application. In this embodiment, the electronic device 70 includes a housing 71 and a projection control circuit 72 connected to the housing 71 .

[0162] It should be noted that the projection control circuit 72 described in this embodiment is the projection control circuit 10, the projection control circuit 20, the projection control circuit 30 or the projection control circuit 40 described in any one of the above embodiments. Figure 1-Figure 17 And the related text content will not be repeated here.

[0163] The beneficial effect of the present application is as follows: Different from the prior art, the projection control circuit provided by the present application is specifically used in train tunnel image projection, the position detection circuit in the projection control circuit is used to obtain the train station signal, the first control circuit couples the position detection circuit and the image projection circuit to receive the train station signal sent by the position detection circuit, generates a first image signal based on the train station signal, and sends the first image signal to the image projection circuit, so that the image projection circuit directionally projects the train station information, so that the train station information can be displayed in the form of a projection screen, so as to significantly increase the display screen, thereby making it easier for passengers to be identified, avoiding the situation where passengers miss the station, and also facilitating better display of the display screen.

[0164] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A projection control circuit, applied to train tunnel image projection, characterized in that: The projection control circuit comprises: Image projection circuit; Position detection circuit, used to obtain train station signals; a first control circuit, coupled to the position detection circuit and the image projection circuit, to receive the train station signal sent by the position detection circuit, generate a first image signal based on the train station signal, and send the first image signal to the image projection circuit, so that the image projection circuit can directionally project the train station information; a second control circuit and a first radio frequency communication circuit, wherein the second control circuit is coupled to the first radio frequency communication circuit, and the first radio frequency communication circuit is used for short-range wireless communication connection with the position detection circuit; a third control circuit, a second radio frequency communication circuit, a first communication detection circuit and a second communication detection circuit, wherein the third control circuit is coupled to the second radio frequency communication circuit, the first communication detection circuit and the second communication detection circuit, the second radio frequency communication circuit is coupled to the second communication detection circuit and is used for short-range wireless communication connection with the position detection circuit, the first communication detection circuit is coupled to the first radio frequency communication circuit and the third control circuit, and the second communication detection circuit is coupled to the second control circuit; Wherein, the first communication detection circuit is used to detect a first signal transmission state of the first radio frequency communication circuit, so as to send the first signal transmission state to the second control circuit and the third control circuit; the second communication detection circuit is used to detect a second signal transmission state of the second radio frequency communication circuit, so as to send the second signal transmission state to the second control circuit and the third control circuit; The second control circuit is further used to select and control the first radio frequency communication circuit or the second radio frequency communication circuit to send the train station signal and / or the train entry and exit signal in real time according to the first signal transmission state and the second signal transmission state; When a signal failure occurs in the second control circuit, the third control circuit selects to control the first radio frequency communication circuit or the second radio frequency communication circuit to send the train station signal and / or the train entry and exit signal in real time according to the first signal transmission state and the second signal transmission state; The first RF communication circuit includes a first RF transmitting and receiving tube, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a first switch tube; wherein the first end of the first RF transmitting and receiving tube is used to couple with the setting level providing end, the second end of the first RF transmitting and receiving tube is coupled with the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is coupled with the second end of the fourth resistor, the second end of the fifth resistor and the third end of the first switch tube, the first end of the fifth resistor is coupled with the first end of the sixth resistor and the tenth end of the second control circuit, the second end of the sixth resistor is coupled with the first end of the first switch tube, and the second end of the first switch tube is grounded; The first communication detection circuit includes a seventh resistor, an eighth resistor, a third capacitor, a fourth capacitor, a second bidirectional diode and a second RF detection sub-circuit; wherein, the first end of the seventh resistor is coupled to the first end of the eighth resistor and is used to couple to the set level providing end, the second end of the seventh resistor is coupled to the first end of the third capacitor, the first end of the fourth capacitor and the third end of the second RF detection sub-circuit, the second end of the eighth resistor is coupled to the first end of the second RF detection sub-circuit, the seventeenth end of the second control circuit and the first end of the second bidirectional diode, and the second end of the third capacitor is coupled to the second end of the fourth capacitor, the second end of the second RF detection sub-circuit and is grounded.

2. The projection control circuit according to claim 1, characterized in that: The projection control circuit further includes a light source control circuit, which is coupled to the image projection circuit and the first control circuit. The position detection circuit is further used to obtain the train entry and exit signal and send the train entry and exit signal to the first control circuit, so that the first control circuit sends a light source control instruction to the light source control circuit based on the train entry and exit signal. Wherein, the light source control circuit is also used to receive the light source control instruction, and send a light source control signal to the image projection circuit based on the light source control instruction, so that the image projection circuit turns on or off the directional projection of the train station information in response to the light source control signal.

3. The projection control circuit according to claim 2, characterized in that: The projection control circuit further includes a setting switch circuit, and the second control circuit is coupled to the setting switch circuit; Among them, the second control circuit is also used to detect the switch state of the setting switch circuit, and control the first radio frequency communication circuit to send the train station signal and / or the train entry and exit signal in real time based on the switch state; the position detection circuit receives the train station signal and / or the train entry and exit signal when establishing a short-range wireless communication connection with the radio frequency communication circuit.

4. The projection control circuit according to claim 3, characterized in that: The projection control circuit further includes a first indication circuit, a second indication circuit and a switch state indication circuit, wherein the first indication circuit is coupled to the second control circuit, the second indication circuit is coupled to the third control circuit, and the switch state indication circuit is coupled to the second control circuit and the third control circuit; Among them, the first indication circuit receives the first operating status signal sent by the second control circuit, and sends out the first optical signal or the second optical signal based on the first operating status signal; the second indication circuit receives the second operating status signal sent by the third control circuit, and sends out the first optical signal or the second optical signal based on the second operating status signal; the switch state indication circuit receives the first switch signal sent by the second control circuit and the second switch signal sent by the third control circuit, and sends out the third optical signal or the fourth optical signal based on the first switch signal and the second switch signal.

5. The projection control circuit according to claim 4, characterized in that: The projection control circuit further includes a power supply circuit and a charging circuit, the charging circuit includes a charging management circuit and a battery, the power supply circuit is coupled to the second control circuit, the first radio frequency communication circuit, the third control circuit, the second radio frequency communication circuit, the first communication detection circuit, the second communication detection circuit, the first indication circuit, the second indication circuit, the switch state indication circuit and the charging management circuit, and is used to be coupled to a DC power supply, and the charging management circuit is coupled to the battery; The power supply circuit receives a first DC signal provided by the DC power supply, converts the first DC signal into a second DC signal, and then outputs the second DC signal to the second control circuit, the first RF communication circuit, the third control circuit, the second RF communication circuit, the first communication detection circuit, the second communication detection circuit, the first indication circuit, the second indication circuit, and the switch state indication circuit; The charging management circuit receives the first DC signal provided by the DC power supply to charge the battery using the first DC signal, or receives a third DC signal sent by the battery and sends the third DC signal to the power supply circuit so that the power supply circuit converts the first DC signal into the second DC signal.

6. The projection control circuit according to any one of claims 1 to 5, characterized in that: The number of the position detection circuits is at least two, and the position detection circuit comprises a first resistor, a second resistor, a first capacitor, a second capacitor, a first bidirectional diode, and a first radio frequency detection subcircuit; Among them, the first end of the first resistor is coupled to the first end of the second resistor and is used to couple with the set level providing end, the second end of the first resistor is coupled to the first end of the first capacitor, the first end of the second capacitor and the third end of the first RF detection sub-circuit, the second end of the second resistor is coupled to the first end of the first RF detection sub-circuit, the first control circuit and the first end of the first bidirectional diode, and the second end of the first capacitor is coupled to the second end of the second capacitor, the second end of the first RF detection sub-circuit and is grounded.

7. The projection control circuit according to any one of claims 4 to 5, characterized in that: The first indication circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second switch tube, a first light-emitting diode and a second light-emitting diode; wherein the first end of the ninth resistor is used to couple with the set level providing end, the second end of the ninth resistor is coupled with the first end of the tenth resistor and the twentieth end of the second control circuit, the second end of the tenth resistor is coupled with the first end of the second switch tube, the second end of the second switch tube is grounded, the third end of the second switch tube is coupled with the first end of the eleventh resistor, the second end of the eleventh resistor is coupled with the first end of the first light-emitting diode, the second end of the first light-emitting diode is coupled with the second end of the second light-emitting diode, the first end of the second light-emitting diode is coupled with the first end of the twelfth resistor, and the second end of the twelfth resistor is coupled with the nineteenth end of the second control circuit; The second indicating circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a third switch tube, a third light-emitting diode and a fourth light-emitting diode; wherein the first end of the thirteenth resistor is used to couple with the setting level providing end, the second end of the thirteenth resistor is coupled with the first end of the fourteenth resistor and the twentieth end of the third control circuit, the second end of the fourteenth resistor is coupled with the first end of the second switch tube, the second end of the third switch tube is grounded, the third end of the third switch tube is coupled with the first end of the fifteenth resistor, the second end of the fifteenth resistor is coupled with the first end of the third light-emitting diode, the second end of the third light-emitting diode is coupled with the second end of the fourth light-emitting diode, the first end of the fourth light-emitting diode is coupled with the first end of the sixteenth resistor, and the second end of the sixteenth resistor is coupled with the nineteenth end of the third control circuit; The switch state indication circuit includes a fifth light-emitting diode, a sixth light-emitting diode, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor and a twenty-second resistor; wherein, the second end of the fifth light-emitting diode is coupled to the second end of the sixth light-emitting diode and is used to couple with the set level providing end, the first end of the fifth light-emitting diode is coupled to the first end of the seventeenth resistor, the second end of the seventeenth resistor is coupled to the third end of the fourth switch tube and the third end of the fifth switch tube, the second end of the fourth switch tube is grounded, the first end of the fourth switch tube is coupled to the first end of the nineteenth resistor, and the second end of the nineteenth resistor is coupled to the set level providing end. The fifteenth terminal of the second control circuit, the second end of the fifth switch tube is grounded, the first end of the fifth switch tube is coupled to the first end of the twentieth resistor, the second end of the twentieth resistor is coupled to the fifteenth terminal of the third control circuit, the second end of the eighteenth resistor is coupled to the third end of the sixth switch tube and the third end of the seventh switch tube, the second end of the sixth switch tube is grounded, the first end of the sixth switch tube is coupled to the first end of the twenty-first resistor, the second end of the twenty-first resistor is coupled to the thirteenth terminal of the second control circuit, the second end of the seventh switch tube is grounded, the first end of the seventh switch tube is coupled to the first end of the twenty-second resistor, and the second end of the twenty-second resistor is coupled to the thirteenth terminal of the third control circuit.

8. The projection control circuit according to claim 5, characterized in that: The power supply circuit includes a first diode, a second diode, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, an eighth switch tube and a first voltage conversion sub-circuit; wherein, the first end of the first diode is coupled to the first end of the fifth capacitor, the first end of the sixth capacitor, and the second end of the second diode, and is used to couple with the DC power supply, the second end of the first diode is grounded, the second end of the fifth capacitor is grounded, the second end of the sixth capacitor is grounded, the first end of the second diode is coupled to the second end of the eighth switch tube, the first end of the seventh capacitor, the first end of the eighth capacitor, the first end of the twenty-fifth resistor and the fourth end of the first voltage conversion sub-circuit, the second end of the seventh capacitor is grounded, and the first end of the eighth capacitor is grounded. two ends are grounded, a first end of the eighth switch tube is coupled to the first end of the twenty-third resistor and the first end of the twenty-fourth resistor, a second end of the twenty-third resistor is grounded, a second end of the twenty-fourth resistor is used to couple with the DC power supply, a second end of the twenty-fifth resistor is coupled to the first end of the first voltage conversion sub-circuit, a first end of the twenty-sixth resistor is coupled to the first end of the twenty-seventh resistor and the fifth end of the first voltage conversion sub-circuit, a second end of the twenty-sixth resistor is coupled to the second end of the twenty-eighth resistor, the first end of the ninth capacitor, and the first end of the tenth capacitor, and is used to couple with the set level providing end, a second end of the twenty-seventh resistor is grounded, a third end of the first voltage conversion sub-circuit is coupled to the first end of the twenty-eighth resistor, a second end of the first voltage conversion sub-circuit is grounded, a second end of the ninth capacitor is grounded, and a second end of the tenth capacitor is grounded; The charging management circuit includes an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a twenty-ninth resistor, a thirtieth resistor, a seventh light-emitting diode and a second voltage conversion sub-circuit; wherein, a first end of the eleventh capacitor is coupled to a first end of the twelfth capacitor and a first end of the twenty-ninth resistor and is grounded, a second end of the eleventh capacitor is coupled to a second end of the twelfth capacitor and a fourth end of the second voltage conversion sub-circuit, a second end of the twenty-ninth resistor is coupled to a fifth end of the second voltage conversion sub-circuit, a second end of the seventh light-emitting diode is used to couple with the DC power supply, a first end of the seventh light-emitting diode is coupled to a first end of the thirtieth resistor, a second end of the thirtieth resistor is coupled to a first end of the second voltage conversion sub-circuit, a third end of the second voltage conversion sub-circuit is coupled to a first end of the thirteenth capacitor, a first end of the fourteenth capacitor, a second end of the battery and a third end of the eighth switch tube, a second end of the second voltage conversion sub-circuit is grounded, a second end of the thirteenth capacitor is grounded, a second end of the fourteenth capacitor is grounded, a first end of the battery is grounded, a third end of the battery is grounded, and a fourth end of the battery is grounded.

9. The projection control circuit according to claim 1, characterized in that: The position detection circuit is used to communicate with the network management terminal, and the position detection circuit receives the train station information and the corresponding preset image information sent by the network management terminal to generate the train station signal and the preset image signal; the first control circuit is also used to receive the train station signal and the preset image signal, generate a second image signal based on the train station signal and the preset image signal, and send the second image signal to the image projection circuit, so that the image projection circuit directionally projects the train station information and the preset image information; And / or, the projection control circuit also includes a radio frequency digital tag, which is used to establish a short-range wireless communication connection with the position detection circuit, so that when the radio frequency digital tag establishes a short-range wireless communication connection with the position detection circuit, the position detection circuit reads the tag information in the radio frequency digital tag to obtain the train station information.

10. A projection control method, applied to the projection control circuit according to any one of claims 1 to 9, characterized in that: The projection control method comprises: Get train station signals; generating a first image signal based on the train station signal; The train station information is directionally projected according to the first image signal.

11. The projection control method according to claim 10, characterized in that: After the step of directionally projecting the train station information according to the first image signal, the method further includes: Get train entry and exit signals; Generate a light source control signal based on the train entry and exit signal; The directional projection of the train station information is turned on or off in response to the light source control signal.

12. An electronic device, characterized in that: The electronic device comprises a housing and a projection control circuit coupled to the housing; Wherein, the projection control circuit is the projection control circuit as described in any one of claims 1-9.

Images