Display device applied to railway vehicle

Abstract

The utility model relates to the technical field of rail traffic lighting display, and discloses a display device applied to a rail vehicle, which comprises a power supply conversion module, a white light control module, an RGB (Red, Green, Blue) control module, a switching module and a display module, the power supply conversion module converts external voltage into power supply voltage of the white light control module, the switching module, the RGB control module and the display module. The input end of the white light control module inputs an external dimming signal, and the output end of the white light control module is connected with the first control end of the display module; the input end of the RGB control module inputs external image data, and the output end of the RGB control module is connected with the second control end of the display module; the input end of the switching module inputs an external dimming signal, and the output end of the switching module is connected with the third control end of the display module. The intelligent ecological display module can be switched between two display states of white light illumination and intelligent ecological display, so that the illumination cost is reduced, and the utilization rate of the display module is improved.

Description

Technical Field

[0001] This utility model relates to the field of rail transit lighting and display technology, specifically to a display device applied to rail vehicles. Background Technology

[0002] Existing rail vehicles use a single color for their lighting, making it impossible to create different intelligent lighting effects within the carriages by adjusting the color of the light source. When large-area intelligent dynamic lighting, ecological atmosphere decoration, and media displays are required, additional displays need to be installed to achieve the desired lighting and decorative effects, leading to a sharp increase in investment costs. Utility Model Content

[0003] In view of this, the present invention provides a display device for use in rail vehicles to solve the problem that existing rail vehicle lighting cannot simultaneously meet the requirements of ecological display.

[0004] This utility model provides a display device for use in rail vehicles, comprising: a power conversion module, an RGB control module, and a display module. The power conversion module inputs external voltage and external data signals. Its first output terminal is connected to the first power supply terminal of the display module. The first output terminal is also connected to the first control terminal of the display module and outputs a PWM signal. The second output terminal of the power conversion module is connected to the power supply terminals of both the RGB control module and the display module. The power conversion module supplies power to the display module and the RGB control module, enabling the display module to adjust the white light brightness based on the PWM signal. The RGB control module inputs external image data from the external data signal. Its output terminal is connected to the second control terminal of the display module. The RGB control module controls the display module to display RGB images based on the external image data.

[0005] The present invention provides a display device for rail vehicles. The display module can provide white light illumination under the action of a PWM signal and adjust the brightness of the white light based on the PWM signal. The display module can also display full-color RGB ambient lighting, intelligent dynamic lighting, ecological atmosphere decoration, media data, etc. under the control of an RGB control module. This allows the display device to flexibly switch between white light illumination and RGB intelligent ecological display states, improving the applicability of the display device. There is no need to install both white light illumination and full-color display modules in the rail vehicle at the same time, saving production costs, improving the intelligence of the rail vehicle, improving passenger visual comfort, and increasing the viewing experience.

[0006] In one optional embodiment, the power conversion module includes: a first voltage conversion unit and a second voltage conversion unit, wherein the input terminal of the first voltage conversion unit receives an external voltage and an external data signal, and the output terminal of the first voltage conversion unit is connected to a first power supply terminal and a first control terminal of the display module. The first voltage conversion unit is used to convert the external voltage into a first voltage and output a PWM signal; the input terminal of the second voltage conversion unit is connected to the output terminal of the first voltage conversion unit, and the output terminal of the second voltage conversion unit is connected to the power supply terminal of the RGB control module and the second power supply terminal of the display module. The second voltage conversion unit is used to convert the first voltage into a second voltage; the external voltage is greater than the first voltage, and the first voltage is greater than the second voltage.

[0007] In one optional embodiment, the first voltage conversion unit includes an EMC unit and a power conversion chip, wherein the input terminal of the EMC unit receives an external voltage, the output terminal of the EMC unit is connected to the input terminal of the power conversion chip, and the EMC unit is used to reduce electromagnetic interference in the external voltage; the output terminal of the power conversion chip is connected to the input terminal of the second voltage conversion unit and outputs a first voltage.

[0008] In one optional implementation, the RGB control module includes a data receiving module and a data processing module. The power supply terminal of the data receiving module is connected to the second output terminal of the power conversion module. The input terminal of the data receiving module receives external image data, and the output terminal of the data receiving module is connected to the input terminal of the data processing module. The data receiving module is used to receive and store the external image data. The power supply terminal of the data processing module is connected to the second output terminal of the power conversion module, and the output terminal of the data processing module is connected to the second control terminal of the display module. The data processing module is used to convert the external image data into display control signals, enabling the display module to display an RGB image based on the display control signals.

[0009] In one optional embodiment, the display module includes: multiple white light control units, a switching unit, an RGB driving unit, and an RGB+W four-primary-color LED array. Each white light control unit's power supply terminal is connected to the first output terminal of the power conversion module, each white light control unit's input terminal receives a PWM signal, and each white light control unit's output terminal is connected to a white light control terminal of the RGB+W four-primary-color LED array. The white light control unit is used to control the RGB+W four-primary-color LED array to adjust the brightness of the white light based on the PWM signal. The switching unit's first input terminal receives an external switching signal, its second input terminal is connected to the second output terminal of the power conversion module, and its output terminal is connected to the second power supply terminal of the RGB+W four-primary-color LED array. The switching unit is used to turn the second power supply terminal of the RGB+W four-primary-color LED array on or off based on the external switching signal, thereby turning the RGB display function on or off. The RGB driving unit's input terminal is connected to the output terminal of the RGB control module, and its output terminal is connected to an RGB control terminal of the RGB+W four-primary-color LED array. The RGB driving unit is used to control the RGB+W four-primary-color LED array to perform RGB display based on the display control signal output by the RGB control module.

[0010] In one optional implementation, the white light control unit includes a filtering unit, an operational amplifier unit, and a switching unit. A first terminal of the filtering unit receives a PWM signal, and a second terminal of the filtering unit is connected to the input terminal of the operational amplifier unit. The output terminal of the operational amplifier unit is connected to the control terminal of the switching unit. The output terminal of the switching unit is connected to a white light control terminal of the RGB+W four-primary-color LED array. The switching unit is used to switch the switching state based on the PWM signal, thereby adjusting the brightness of the white light from the RGB+W four-primary-color LED array.

[0011] In one optional implementation, the display module further includes a data scanning chip, the input terminal of which is connected to the output terminal of the RGB control module, and the output terminal of which is connected to the input terminal of the RGB driving unit. The data scanning chip is used to control the RGB+W four-primary-color LED array to perform RGB scanning display based on the display control signal.

[0012] In one optional implementation, the RGB driving unit includes a red light driving unit, a green light driving unit, and a blue light driving unit. Each output terminal of the red light driving unit is connected to a red light control terminal of the RGB+W four-primary-color LED array; each output terminal of the green light driving unit is connected to a green light control terminal of the RGB+W four-primary-color LED array; and each output terminal of the red light driving unit is connected to a blue light control terminal of the RGB+W four-primary-color LED array. The control terminals of the red light driving unit, green light driving unit, and blue light driving unit are all connected to the output terminals of the data scanning chip. The red light driving unit, green light driving unit, and blue light driving unit are respectively used to control the RGB+W four-primary-color LED array to perform red light, green light, and blue light scanning display based on the output signal of the data scanning chip.

[0013] In one optional implementation, the RGB+W four-primary-color LED array includes: a plurality of LEDs cascaded according to a preset number of rows and a preset number of columns.

[0014] In one optional embodiment, each LED includes: a white LED, a red LED, a green LED, and a blue LED. The white LEDs in each row of LEDs are connected in series, with one end connected to the output of a white light control unit and the other end connected to the first output of a power conversion module. The first end of each red LED in each row of LEDs is connected to an output of a switching unit, and the second end of each red LED in each row of LEDs is connected to an output of a red light driving unit. Similarly, the first end of each green LED in each row of LEDs is connected to an output of a switching unit, and the second end of each green LED in each row of LEDs is connected to an output of a green light driving unit. The first end of each blue LED in each row of LEDs is connected to an output of a switching unit, and the second end of each blue LED in each row of LEDs is connected to an output of a blue light driving unit. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a component diagram of a display device applied to a rail vehicle according to an embodiment of the present utility model;

[0017] Figure 2 This is another component diagram of a display device applied to a rail vehicle according to an embodiment of the present utility model;

[0018] Figure 3 This is a specific circuit structure diagram of a power conversion module according to an embodiment of the present utility model;

[0019] Figure 4 This is another component diagram of a display device applied to a rail vehicle according to an embodiment of the present utility model;

[0020] Figure 5 This is another component diagram of a display device applied to a rail vehicle according to an embodiment of the present utility model;

[0021] Figure 6 This is a specific circuit structure diagram of the white light control unit according to an embodiment of the present utility model;

[0022] Figure 7 This is another component diagram of a display device applied to a rail vehicle according to an embodiment of the present utility model;

[0023] Figure 8 This is a specific circuit structure diagram of an RGB driving unit according to an embodiment of the present utility model;

[0024] Figure 9 This is a specific circuit structure diagram of an RGB+W four-primary-color LED array according to an embodiment of the present utility model;

[0025] Figure 10 This is a specific circuit structure diagram of the switching unit according to an embodiment of the present utility model. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] This embodiment provides a display device for use in rail vehicles, such as... Figure 1 As shown, it includes: power conversion module 1, RGB control module 2 and display module 3.

[0031] Specifically, Figure 1 In this configuration, the power conversion module 1 receives external voltage and external data signals. The first output terminal of the power conversion module 1 is connected to the first power supply terminal of the display module 3. The first output terminal of the power conversion module 1 is also connected to the first control terminal of the display module 3 and outputs a PWM signal. The second output terminal of the power conversion module 1 is connected to the power supply terminal of the RGB control module 2 and the second power supply terminal of the display module 3. The input terminal of the RGB control module 2 receives external image data from the external data signals, and the output terminal of the RGB control module 2 is connected to the second control terminal of the display module 3.

[0032] Specifically, Figure 1 In this embodiment, display module 3 is a fully-on W+RGB four-primary-color display module, which integrates multiple W+RGB LEDs. W+RGB refers to LEDs that combine white (W), red (R), green (G), and blue (B) colors. The W+RGB LEDs can mix full-color light by adjusting the brightness ratio of the white, red, green, and blue LEDs under different control signals. In this embodiment, since the power supply voltage of the white LEDs is different from that of the RGB LEDs, a power conversion module 1 is used to convert the external power supply voltage into two different voltage levels, supplying power to the white LEDs in display module 3 and the RGB control module 2 respectively.

[0033] Specifically, Figure 1In the power conversion module 1, a PWM signal is output during operation. This PWM signal serves as the dimming signal for white light, allowing the white LEDs to control the switching of the white light based on the duty cycle of the PWM signal, achieving stepless adjustment of white light brightness from 0-100%. When lighting is required for the rail vehicle, the operator can adjust the output voltage and duty cycle of the PWM signal of the power conversion module 1 to activate the white light display of the display module 3, providing different brightness levels for the interior of the carriage. When the display module 3 needs to display RGB full-color data, such as creating a dynamic lighting effect of blue sky and white clouds over a large area of ​​the carriage against an ecological background, displaying corresponding atmospheric decorations based on urban culture, or for media promotion, the operator inserts the edited external image data into the external data signal and inputs it into the power conversion module 1. The RGB control module 2 then recognizes the external image data and uses its integrated mature image processing software to convert the external image data into control signals, controlling the RGB LEDs in different areas of the display module 3 to display different colors, so that the display module 3 displays the same content as the external image.

[0034] It should be noted that when using white light to illuminate the vehicle interior, the priority of white light can be set higher than that of RGB display. That is, when the white LED in the W+RGB lamp is lit, the RGB LED in the W+RGB lamp is turned off. Operators can also control the display module 3 in sections, so that some areas of the display module 3 display RGB and other areas are illuminated with white light.

[0035] The display device for rail vehicles provided in this embodiment can provide white light illumination under the action of a PWM signal and adjust the white light brightness based on the PWM signal. The display module can also display full-color RGB ambient lighting, intelligent dynamic lighting, ecological atmosphere decoration, media data, etc. under the control of the RGB control module. This allows the display device to flexibly switch between white light illumination and RGB intelligent ecological display states, which improves the applicability of the display device. There is no need to install both white light illumination and full-color display modules in the rail vehicle at the same time, which saves production costs, improves the intelligence of the rail vehicle, enhances passenger visual comfort, and increases the viewing experience.

[0036] In some alternative implementations, such as Figure 2As shown, the power conversion module 1 includes a first voltage conversion unit 11 and a second voltage conversion unit 12. The input terminal of the first voltage conversion unit 11 receives external voltage and external data signals, and the output terminal of the first voltage conversion unit is connected to the first power supply terminal and the first control terminal of the display module 3. The first voltage conversion unit 11 is used to convert the external voltage into a first voltage and output a PWM signal. The input terminal of the second voltage conversion unit 12 is connected to the output terminal of the first voltage conversion unit 11, and the output terminal of the second voltage conversion unit 12 is connected to the power supply terminal of the RGB control module 2 and the second power supply terminal of the display module 3. The second voltage conversion unit is used to convert the first voltage into a second voltage. The external voltage is greater than the first voltage, and the first voltage is greater than the second voltage.

[0037] Specifically, Figure 3 In the first voltage conversion unit 11, there are: an EMC unit 111 and a power conversion chip 112. The input terminal of the EMC unit 111 receives an external voltage, and the output terminal of the EMC unit 111 is connected to the input terminal of the power conversion chip 112. The EMC unit 111 is used to reduce electromagnetic interference in the external voltage. The output terminal of the power conversion chip 112 is connected to the input terminal of the second voltage conversion unit 12 and outputs a first voltage.

[0038] For example, Figure 3 In the process, the external voltage is DC110V. The power conversion chip 112 steps down the DC110V to a first voltage of 48V and outputs it to the first power supply terminal and the first control terminal of the display module 3 to power the white LED beads in the display module 3. The first voltage of 48V is a PWM signal. The second voltage conversion unit 12 steps down the first voltage of 48V and outputs a second voltage of 5V to power the RGB control module 2 and the RGB LED beads in the display module 3.

[0039] In some alternative implementations, such as Figure 4 As shown, the RGB control module 2 includes a data receiving module 21 and a data processing module 22. The power supply terminal of the data receiving module 21 is connected to the second output terminal of the power conversion module 1, the input terminal of the data receiving module 21 receives external image data, and the output terminal of the data receiving module 21 is connected to the input terminal of the data processing module 22. The data receiving module 21 is used to receive and store external image data. The power supply terminal of the data processing module 22 is connected to the second output terminal of the power conversion module 1, and the output terminal of the data processing module 22 is connected to the second control terminal of the display module 3. The data processing module 22 is used to convert the external image data into display control signals, so that the display module 3 displays RGB images based on the display control signals.

[0040] Specifically, Figure 4In this configuration, the data receiving module 21 receives external image data sent by the train and stores uploaded image and video data. It supports RJ45 port transmission and wireless signal transmission. The data processing module 22 converts and downloads data, receives image and video data, and decomposes the image and video data into corresponding display control signals according to the set display module model, specifications, and cascading method, sending them to the display module output. Clock signals, cascading data latch and enable signals, color ratio data signals, brightness ratio data signals, horizontal scan control signals, and vertical scan control signals are output to the display module 3.

[0041] It should be noted that the data receiving module and data processing module in this embodiment integrate mature data processing software from the prior art. This software can convert image data into display control signals. For example, for each pixel of the external image data, it calculates the monochrome value of each primary color included in the target format image, replaces the RGB three-color channel values ​​of the image pixel with the calculated values ​​of the three primary color channels of the converted RGB image pixel, and uses this as a display control signal, which is then input to the display device for display. That is, this embodiment only protects the connection relationship, not the image data processing method.

[0042] In some alternative implementations, such as Figure 5 As shown, the display module 3 includes: multiple white light control units 31, a switching unit 32, an RGB driving unit 33, and an RGB+W four-primary-color LED array 34.

[0043] Figure 5 In this configuration, the power supply terminal of each white light control unit 31 is connected to the first output terminal of the power conversion module 1, the input terminal of each white light control unit is input with a PWM signal, and the output terminal of each white light control unit 31 is connected to a white light control terminal of the RGB+W four-primary-color LED array 34. The white light control unit 31 is used to control the RGB+W four-primary-color LED array 34 to adjust the brightness of the white light based on the PWM signal.

[0044] Figure 5 In the process, the first input terminal of the switching unit 32 receives an external switching signal, the second input terminal of the switching unit 32 is connected to the second output terminal of the power conversion module 1, and the output terminal of the switching unit 32 is connected to the second power supply terminal of the RGB+W four-primary-color LED array 34. The switching unit is used to turn on or off the second power supply terminal of the RGB+W four-primary-color LED array 34 based on the external switching signal, thereby turning on or off the RGB display function.

[0045] Figure 5In the RGB drive unit 33, the input terminal is connected to the output terminal of the RGB control module 2, and the output terminal of the RGB drive unit 33 is connected to one of the RGB control terminals of the RGB+W four primary color LED array. The RGB drive unit is used to control the RGB+W four primary color LED array to perform RGB display based on the display control signal output by the RGB control module 2.

[0046] Specifically, the RGB+W four-primary-color LED array 34 includes multiple LEDs cascaded according to a preset number of rows and columns. Each LED includes a white LED, a red LED, a green LED, and a blue LED. A white LED control unit 31 can control the white LEDs in a row of LEDs connected in series, or it can control the white LEDs in a column of LEDs connected in series, the number of which is determined by the connection method of the LEDs.

[0047] Specifically, Figure 6 In the white light control unit 31, there are: a filtering unit 311, an operational amplifier unit 312, and a switching unit 313. The first terminal of the filtering unit 311 is input with a PWM signal, and the second terminal of the filtering unit 311 is connected to the input terminal of the operational amplifier unit 312. The output terminal of the operational amplifier unit 312 is connected to the control terminal (i.e., R2) of the switching unit 313. The output terminal of the switching unit 313 is connected to a white light control terminal (i.e., LED1-(W)) of the RGB+W four-primary-color LED array 34. The switching unit 313 is used to switch the switching state based on the PWM signal, thereby adjusting the brightness of the white light of the RGB+W four-primary-color LED array 34.

[0048] Optionally, the number of white light control units 31 is the same as the number of white light control terminals of the RGB+W four-primary-color LED array 34. When there are n white light control units, the output terminals of the n white light control units are respectively connected to the n white light control terminals LED1-(W) to LEDn-(W) of the RGB+W four-primary-color LED array 34.

[0049] In some alternative implementations, such as Figure 7 As shown, the display module 3 also includes a data scanning chip 35, the input terminal of which is connected to the output terminal of the RGB control module 2, and the output terminal of which is connected to the input terminal of the RGB driving unit 33.

[0050] Specifically, Figure 7 In this process, the data scanning chip 35 is used to control the single pixel in the RGB+W four-primary-color LED array 34 to light up based on the display control signal using a line / field scanning method, thereby achieving the display function. The data scanning chip 35 integrates mature control software from the existing technology, and its specific scanning method will not be described in detail here.

[0051] In some alternative implementations, such as Figure 8 As shown, the RGB driving unit 33 includes a red light driving unit 331, a green light driving unit 332, and a blue light driving unit 333. Each output terminal of the red light driving unit 331 is connected to a red light control terminal of the RGB+W four-primary-color LED array 34. Each output terminal of the green light driving unit 332 is connected to a green light control terminal of the RGB+W four-primary-color LED array 34. Each output terminal of the red light driving unit 331 is connected to a blue light control terminal of the RGB+W four-primary-color LED array 34. The control terminals of the red light driving unit 331, green light driving unit 332, and blue light driving unit 333 are all connected to the output terminal of the data scanning chip 35 to receive RGB field scanning signals. The red light driving unit 331, green light driving unit 332, and blue light driving unit 333 are respectively used to control the RGB+W four-primary-color LED array 34 to perform red, green, and blue light scanning display based on the output signals of the data scanning chip 35.

[0052] For example, the RGB+W four-primary-color LED array 34 in this embodiment includes 16 red light control terminals, 16 green light control terminals, and 16 blue light control terminals, respectively connected to... Figure 8 The 16 output terminals (R1 to R16) of the red light driving unit 331, the 16 output terminals (G1 to G16) of the green light driving unit 332, and the 16 output terminals (B1 to B16) of the blue light driving unit 333 are connected accordingly. The red light driving unit 331 controls the red light part of the RGB+W four-primary-color LED array 34, the green light driving unit 332 controls the green light part of the RGB+W four-primary-color LED array 34, and the blue light driving unit 333 controls the blue light part of the RGB+W four-primary-color LED array 34. All of them control the on / off state of each output terminal based on the received RGB field scanning signal, and adjust the ratio of red light, green light, and blue light of the RGB+W four-primary-color LED array 34 connected to the corresponding output terminal to display an RGB full-color image.

[0053] In some alternative implementations, such as Figure 9 As shown, each LED (LED1 to LED32) includes, from top to bottom, a white LED, a green LED, a red LED, and a blue LED (corresponding to the four black rectangles in each LED).

[0054] For example, in this embodiment, the RGB+W four-primary-color LED array 34 is a 32*16 uniformly arranged LED array with 16 LEDs per row and 32 LEDs per column. Figure 9 The example shows 32 LEDs cascaded together, with 8 LEDs in one row and 4 LEDs in one column. The connection relationships of the remaining LEDs are not shown.

[0055] Specifically, Figure 10 The circuit diagram of switching unit 32 shows that the input terminal of switching unit 32 (i.e., pin E3 of U3) receives the switching signal, and the output terminal of U3 (i.e., terminals Y0 to Y1) is connected to the corresponding input pins of U4 and U5 respectively. The output terminals of U4 and U5 are respectively connected to... Figure 9 The RGB power supply terminals LED+(1H) to LED+(4H) in each row of LEDs are connected.

[0056] Specifically, Figure 9 In each row of LEDs, the white LED beads are connected in series, with one end connected to the output terminal of a white light control unit (i.e., LED1-(W)~LED8-(W)) and the other end connected to the first output terminal (i.e., DC48V+(W)) of the power conversion module 1; the first end of the red LED beads in each row of LEDs is connected to one output terminal (LED+(1H)~LED+(4H)) of the switching unit 32, and the second end of the red LED beads in each row of LEDs is connected to one output terminal (i.e., R1~R16) of the red light driving unit 331; each row of LEDs... The first end of each green LED in the LED is connected to one output terminal (LED+(1H)~LED+(4H)) of the switching unit 32, and the second end of each green LED in each row of LEDs is connected to one output terminal (i.e., G1~G16) of the green light driving unit 332; the first end of each blue LED in each row of LEDs is connected to one output terminal (LED+(1H)~LED+(4H)) of the switching unit 32, and the second end of each blue LED in each row of LEDs is connected to one output terminal (i.e., B1~B16) of the blue light driving unit 333.

[0057] Specifically, refer to Figures 8-10 The RGB+W four-primary-color LED array 34 uses LEDs as display wafers. Each LED contains white, red, green, and blue LEDs. The white light part is independently powered by DC48V, while the full-color RGB part, composed of red, green, and blue LEDs, is independently powered by DC5V. The DC48V and DC5V power supply units are designed with an isolated layout. The external data signal input from the train data input is processed and converted by the power module, and the signal is smoothly switched in the RGB+W four-primary-color LED array.

[0058] Specifically, refer to Figures 8-10The white light is powered by a constant DC 48V supply and dimmed using analog current adjustment. The white LED temperature can be selected according to customer needs, with a range of 2700K-6500K. The white light is controlled by the PWM duty cycle, allowing for stepless brightness adjustment from 0-100% and switching between the white light and RGB display modules. The current of each white LED signal is consistent, ensuring uniform current across all series-connected LEDs. This results in a uniform and soft white light emission surface, achieving stepless linear changes in LED brightness and providing a soft, flicker-free lighting effect.

[0059] Specifically, refer to Figures 8-10 Each LED in the full-color RGB array uses a dedicated 16-channel LED constant current driver IC to independently control the three colors of each color using a red light driver unit 331, a green light driver unit 332, and a blue light driver unit 333. It incorporates a built-in CMOS shift register and latch function, converting serial input data into parallel output data format. Supporting clock frequencies up to 25MHz, it can meet the needs of large data transmission. The current of each channel can be adjusted according to the external hardware circuit settings. Through the RGB color brightness serial data signal received by the data receiving module, the 16 channels are divided into upper and lower groups of 8-bit channels to achieve parallel control of color brightness output and the switching of the RGB-LED negative terminals. Then, a dedicated display 245... The tri-state output eight-channel bidirectional transceiver chip controls the cascaded control output of the full-color RGB display module circuit unit by receiving clock data from the data receiving module, cascaded data latching, and enable signals. The cascaded signal is input from the serial bus via the SDI pin of the LED constant current driver IC, then processed by the LED constant current driver IC, and output from the SDO pin to the SDI pin of the next LED constant current driver IC to complete the next level of cascaded control. A 138 high-speed CMOS chip circuit is used for decoding. The received field control signal is driven and output to the 138 high-speed CMOS chip for decoding. After decoding, the PMOS field effect transistors U4 / U5 are controlled to control the vertical scanning of the RGB-LED power supply positive terminal of the full-color RGB display module to achieve field scanning display.

[0060] Specifically, refer to Figures 8-10 The system receives data from a data receiving module, which outputs a constant current driver IC to control the negative terminal of a full-color RGB-LED. A 138 high-speed CMOS chip decodes the data and controls the positive terminal output of the full-color RGB-LED for vertical field display. Simultaneously, it uses a line / field scanning method to control the illumination of individual pixels, achieving the display function. White light and RGB ambient display are achieved using the enable pin of the 138 high-speed CMOS chip.

[0061] Specifically, refer to Figures 8-10When switching between white light and RGB display, the module output signal is controlled via optocoupler isolation input. When white light is on, the power supply output analog signal controls the enable terminal of the 138 decoder U3, stopping the horizontal scanning output and turning off the data output of the RGB display circuit. This immediately turns off the positive terminal of the RGB-LED power supply of the field-effect transistor, thus turning off the RGB-LED. Conversely, when white light is turned off as a display effect, the power supply output analog signal controls the enable terminal of the 138 decoder IC, restoring the enable terminal function and the decoder to normal output. This turns on the positive terminal of the RGB-LED power supply controlled by the field-effect transistor, restoring the output of the RGB-LED and outputting a full-color RGB-LED. When used as a lighting effect, white light has higher priority than the RGB display.

[0062] It should be noted that all data processing methods involved in this embodiment are implemented using mature software in the existing technology, that is, this embodiment only protects the structure of the display device.

[0063] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A display device for use in rail vehicles, characterized in that, include: The power conversion module, RGB control module, and display module are included. The power conversion module receives external voltage and external data signals. The first output terminal of the power conversion module is connected to the first power supply terminal of the display module. The first output terminal of the power conversion module is also connected to the first control terminal of the display module and outputs a PWM signal. The second output terminal of the power conversion module is connected to the power supply terminal of the RGB control module and the second power supply terminal of the display module. The power conversion module is used to supply power to the display module and the RGB control module, and to enable the display module to adjust the white light brightness based on the PWM signal. The input terminal of the RGB control module receives external image data from the external data signal, and the output terminal of the RGB control module is connected to the second control terminal of the display module. The RGB control module is used to control the display module to display RGB images based on the external image data.

2. The display device according to claim 1, characterized in that, The power conversion module includes: a first voltage conversion unit and a second voltage conversion unit, wherein... The input terminal of the first voltage conversion unit receives external voltage and external data signals, and the output terminal of the first voltage conversion unit is connected to the first power supply terminal and the first control terminal of the display module. The first voltage conversion unit is used to convert the external voltage into a first voltage and output a PWM signal. The input terminal of the second voltage conversion unit is connected to the output terminal of the first voltage conversion unit, and the output terminal of the second voltage conversion unit is connected to the power supply terminal of the RGB control module and the second power supply terminal of the display module. The second voltage conversion unit is used to convert the first voltage into a second voltage. The external voltage is greater than the first voltage, and the first voltage is greater than the second voltage.

3. The display device according to claim 2, characterized in that, The first voltage conversion unit includes: an EMC unit and a power conversion chip, wherein, The input terminal of the EMC unit receives an external voltage, and the output terminal of the EMC unit is connected to the input terminal of the power conversion chip. The EMC unit is used to reduce electromagnetic interference in the external voltage. The output terminal of the power conversion chip is connected to the input terminal of the second voltage conversion unit, and outputs the first voltage.

4. The display device according to claim 1, characterized in that, The RGB control module includes: a data receiving module and a data processing module, wherein, The power supply terminal of the data receiving module is connected to the second output terminal of the power conversion module. The input terminal of the data receiving module receives external image data, and the output terminal of the data receiving module is connected to the input terminal of the data processing module. The data receiving module is used to receive and store the external image data. The power supply terminal of the data processing module is connected to the second output terminal of the power conversion module, and the output terminal of the data processing module is connected to the second control terminal of the display module. The data processing module is used to convert the external image data into a display control signal, so that the display module displays an RGB image based on the display control signal.

5. The display device according to claim 1, characterized in that, The display module includes: multiple white light control units, a switching unit, an RGB driving unit, and an RGB+W four-primary-color LED array, wherein... The power supply terminal of each white light control unit is connected to the first output terminal of the power conversion module, the input terminal of each white light control unit is input with the PWM signal, and the output terminal of each white light control unit is connected to a white light control terminal of the RGB+W four-primary-color LED array. The white light control unit is used to control the RGB+W four-primary-color LED array to adjust the brightness of the white light based on the PWM signal. The first input terminal of the switching unit receives an external switching signal, the second input terminal of the switching unit is connected to the second output terminal of the power conversion module, and the output terminal of the switching unit is connected to the second power supply terminal of the RGB+W four-primary-color LED array. The switching unit is used to turn the second power supply terminal of the RGB+W four-primary-color LED array on or off based on the external switching signal, thereby turning the RGB display function on or off. The input terminal of the RGB driving unit is connected to the output terminal of the RGB control module, and the output terminal of the RGB driving unit is connected to one of the RGB control terminals of the RGB+W four-primary-color LED array. The RGB driving unit is used to control the RGB+W four-primary-color LED array to perform RGB display based on the display control signal output by the RGB control module.

6. The display device according to claim 5, characterized in that, The white light control unit includes: a filtering unit, an operational amplifier unit, and a switching unit, wherein... The first terminal of the filtering unit receives the PWM signal, and the second terminal of the filtering unit is connected to the input terminal of the operational amplifier unit. The output terminal of the operational amplifier unit is connected to the control terminal of the switching unit; The output terminal of the switching unit is connected to a white light control terminal of the RGB+W four-primary-color LED array. The switching unit is used to switch the switching state based on the PWM signal, thereby adjusting the brightness of the white light of the RGB+W four-primary-color LED array.

7. The display device according to claim 5, characterized in that, The display module also includes a data scanning chip. The input terminal of the data scanning chip is connected to the output terminal of the RGB control module, and the output terminal of the data scanning chip is connected to the input terminal of the RGB driving unit. The data scanning chip is used to control the RGB+W four-primary-color LED array to perform RGB scanning display based on the display control signal.

8. The display device according to claim 7, characterized in that, The RGB driving unit includes: a red light driving unit, a green light driving unit, and a blue light driving unit, wherein... Each output terminal of the red light driving unit is connected to a red light control terminal of the RGB+W four-primary-color LED array; Each output terminal of the green light driving unit is connected to a green light control terminal of the RGB+W four-primary-color LED array; Each output terminal of the red light driving unit is connected to a blue light control terminal of the RGB+W four-primary-color LED array; The control terminals of the red light driving unit, green light driving unit, and blue light driving unit are all connected to the output terminal of the data scanning chip. The red light driving unit, green light driving unit, and blue light driving unit are respectively used to control the RGB+W four-primary-color LED array to perform red light, green light, and blue light scanning display based on the output signal of the data scanning chip.

9. The display device according to claim 8, characterized in that, The RGB+W four-primary-color LED array includes: Multiple LEDs are cascaded according to a preset number of rows and columns.

10. The display device according to claim 9, characterized in that, Each of the LEDs includes: one white LED, one red LED, one green LED, and one blue LED, wherein... After the white LEDs in each row are connected in series, one end is connected to the output terminal of one of the white light control units, and the other end is connected to the first output terminal of the power conversion module. The first end of the red LED in each row of LEDs is connected to one output terminal of the switching unit, and the second end of the red LED in each row of LEDs is connected to one output terminal of the red light driving unit. The first end of the green LED in each row of LEDs is connected to one output terminal of the switching unit, and the second end of the green LED in each row of LEDs is connected to one output terminal of the green light driving unit. The first end of the blue LED in each row of LEDs is connected to one output terminal of the switching unit, and the second end of the blue LED in each row of LEDs is connected to one output terminal of the blue light driving unit.

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