A LED automatic splicing screen and cascading method

Abstract

The present invention discloses an automatic LED splicing screen and a cascading method. The automatic LED splicing screen comprises a plurality of control cards and a plurality of LED display modules; each LED display module is connected to a corresponding control card; the plurality of control cards are sequentially cascaded through an HDMI interface; the display area coordinates of the LED display modules connected to the plurality of control cards are automatically set by the order in which the plurality of control cards are sequentially cascaded, and if the cascading order of the plurality of control cards is changed, the display area coordinates of the LED display modules connected to the plurality of control cards will also be automatically adjusted according to the changed cascading order. The present invention can realize the automatic cascading of the LED splicing screen.

Description

Technical Field

[0001] The present invention relates to the technical field of LED splicing screens, and in particular to an LED automatic splicing screen and a cascading method. Background Art

[0002] Currently, a large-area LED display device can be realized by splicing and displaying a plurality of small-sized LED display modules.

[0003] When LED display modules are spliced ​​and cascaded, each LED display module needs to know its display area, so generally the wiring sequence is confirmed first, and then the coordinate parameters of each LED display module are set one by one.

[0004] However, when the required LED display device is very large, it will take a lot of time and manpower to set the coordinate parameters of each LED display module one by one, and after the coordinate parameters are set, the position of the LED display module and the wiring sequence of its corresponding control card cannot be changed arbitrarily, which is not conducive to subsequent modification and maintenance. Summary of the invention

[0005] The invention provides an LED automatic splicing screen and a cascading method, so as to solve the problem that the existing LED splicing screen cannot be arbitrarily wired and automatically cascaded.

[0006] In a first aspect, an embodiment of the present invention provides an LED automatic splicing screen, the LED automatic splicing screen comprising a plurality of control cards and a plurality of LED display modules;

[0007] Each LED display module is connected to a control card;

[0008] The multiple control cards are cascaded in sequence via the HDMI interface;

[0009] The display area coordinates of the LED display modules connected to the multiple control cards are automatically set according to the cascading order of the multiple control cards. If the cascading order of the multiple control cards is changed, the display area coordinates of the LED display modules connected to the multiple control cards will also be automatically adjusted according to the changed cascading order.

[0010] Optionally, the control card further includes: a main control chip, a gating chip, a decoding chip and an FPGA;

[0011] The main control chip is connected to the gating chip, the gating chip is connected to the decoding chip, the decoding chip is connected to the FPGA, and the FPGA is connected to the LED display module.

[0012] Optionally, the decoding chip of the upper-level control card is also connected to the gating chip of the lower-level control card;

[0013] The multiple control cards include a first-level control card, wherein the first-level control card refers to a control card in which the gate chip is only connected to the main control chip;

[0014] The main control chip of the first-level control card is used to transmit data packets to the enable chip of the first-level control card, and the data packets include: video data, audio data, EDID data, E-EDID data and various auxiliary data.

[0015] Optionally, the gating chip of the control card is used to select the data packet to be transmitted;

[0016] The gating chip of the first-level control card selects to transmit a data packet outputted by the main control chip of the first-level control card;

[0017] The strobe chips of other control cards except the first-level control card select to transmit the data packets outputted by the previous-level control card.

[0018] Optionally, the decoding chip is used to add 1 to the characteristic value in the E-EDID data in the received data packet and transmit it to the gating chip of the next level control card;

[0019] The decoding chip is also used to decode the characteristic value in the E-EDID data to obtain the display area coordinates of the LED display module, and transmit the display data of the display area coordinates to the LED display module through the FPGA.

[0020] Optionally, the decoding chip is also used to extract audio data from the data packet and output the audio data.

[0021] Optionally, the model of the main control chip is RK3566, the model of the selection chip is LT8631UX, and the model of the decoding chip is GSV2011 chip.

[0022] In a second aspect, an embodiment of the present invention further provides a cascading method for an LED automatic splicing screen, and the cascading method for an LED automatic splicing screen is executed by the LED automatic splicing screen described in any one embodiment of the first aspect;

[0023] The cascading method of the LED automatic splicing screen includes:

[0024] The control card at the upper level transmits the data packets to be transmitted to the control card at the lower level through the HDMI interface, wherein the data packets include: video data, audio data, EDID data, E-EDID data and various auxiliary data;

[0025] The upper level control card further comprises, before transmitting the data packet to the lower level control card:

[0026] Add 1 to the characteristic value in the E-EDID data in the data packet, and generate the display area coordinates of the LED display module connected to the next-level control card after the characteristic value is parsed by the next-level control card;

[0027] The LED display module displays an image according to the received display data and the display area coordinates.

[0028] The technical solution of the embodiment of the present invention is to cascade multiple control cards in sequence through the HDMI interface, and the display area coordinates of the LED display modules connected to the multiple control cards are automatically set according to the order in which the multiple control cards are cascaded in sequence. If the cascading order of the multiple control cards is changed, the display area coordinates of the LED display modules connected to the multiple control cards will also be automatically adjusted according to the changed cascading order, which solves the problem that the existing LED splicing screen cannot be arbitrarily wired and automatically cascaded, and has the beneficial effects of realizing automatic cascading, arbitrarily changing the wiring order of the control cards in the middle, and each control card can automatically adjust the display coordinates.

[0029] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A structural diagram of an LED automatic splicing screen provided by an embodiment of the present invention;

[0032] Figure 2 A structural diagram of another LED automatic splicing screen provided by an embodiment of the present invention;

[0033] Figure 3 A structural diagram of a control card provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof 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 necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Figure 1 This is a structural diagram of the LED automatic splicing screen provided by an embodiment of the present invention. Figure 2 This is a structural diagram of another LED automatic splicing screen provided by an embodiment of the present invention. Figure 3 The structure diagram of the control card provided by the embodiment of the present invention. Figure 1-3 The LED automatic splicing screen provided by the embodiment of the present invention is exemplarily described.

[0037] refer to Figure 1 The LED automatic splicing screen includes multiple control cards 10 and multiple LED display modules 30 (only two are taken as an example in the figure).

[0038] Specifically, each LED display module 30 is connected to a corresponding control card 10, and multiple control cards 10 are cascaded in sequence through the HDMI interface. The display area coordinates of the LED display modules 30 connected to the multiple control cards 10 are automatically set according to the order in which the multiple control cards 10 are cascaded in sequence. If the cascade order of the multiple control cards 10 is changed, the display area coordinates of the LED display modules 30 connected to the multiple control cards 10 will also be automatically adjusted according to the changed cascade order.

[0039] For example, continue to refer to Figure 1 In this embodiment, an LED automatic splicing screen including two control cards and two LED display modules is used as an example for explanation. The multiple control cards 10 include a control card 101 and a control card 102, and the multiple LED display modules 30 include an LED display module 301 and an LED display module 302, wherein the control card 101 is connected to the LED display module 301, the control card 102 is connected to the LED display module 302, and the control card 101 is connected to the control card 102.

[0040] Exemplary, reference Figure 2This embodiment is described by taking an LED automatic splicing screen including n control cards 10 and n LED display modules 30 as an example, wherein n is a positive integer. The connection relationship between each control card 10 and between each control card 10 and each display module 30 is as follows: Figure 2 shown.

[0041] It should be noted that the embodiment of the present invention does not limit the number of control cards 10 and LED display modules 30, and those skilled in the art can set them according to actual needs.

[0042] Continue to refer Figure 1 The control card 10 further includes: a main control chip 11, a gate chip 12, a decoding chip 13 and an FPGA 14. The main control chip 11 is connected to the gate chip 12, the gate chip 12 is connected to the decoding chip 13, the decoding chip 13 is connected to the FPGA 14, and the FPGA 14 is connected to the LED display module 30.

[0043] Specifically, the decoding chip 13 of the upper-level control card 10 is also connected to the gating chip 12 of the lower-level control card 10. The multiple control cards 10 include a first-level control card, which refers to a control card 10 in which the gating chip 12 is only connected to the main control chip 11. The main control chip 11 of the first-level control card is used to transmit a data packet to the gating chip 12 of the first-level control card, and the data packet includes: video data, audio data, EDID data, E-EDID data and various auxiliary data.

[0044] It should be noted that video data, audio data and various auxiliary data are transmitted through the TMDS (Transition Minimized Differential Signal) channel of HDMI, EDID data is transmitted through the DDC (Display Data Channel) channel of HDMI, and E-EDID data is transmitted through the SCDC (State and Control Data Channel) channel.

[0045] Exemplary, reference Figure 1 It can be seen that in this embodiment, the first control card is the control card 101, and the decoding chip 13 of the control card 101 is also connected to the enabling chip 12 of the control card 102. The main control chip 11 of the control card 101 can transmit the data packet to the enabling chip 12 of the control card 101, and the data packet output by the main control chip 11 of the control card 101 can also be transmitted to the control card 102 through the main control chip 11 of the control card 101, the enabling chip 12, the decoding chip 13 and the enabling chip 12 of the control card 102.

[0046] Adaptively, the multiple control cards 10 of the embodiment of the present invention may also include a control card 103, and then the data packet output by the main control chip 11 of the control card 101 may also be transmitted to the control card 103 through the main control chip 11, the enable chip 12, the decoding chip 13 of the control card 101 and the enable chip 12, the decoding chip 13 and the enable chip 12 of the control card 102.

[0047] It should be noted that each control card 10 is connected via an HDMI interface.

[0048] Specifically, refer to Figure 1 The gating chip 12 of the control card 10 is used to select the data packet to be transmitted. Among them, the gating chip 12 of the first-level control card, i.e., the control card 101, selects to transmit the data packet outputted from the main control chip 11 of the first-level control card, and the gating chip 12 of the other control cards, i.e., the control card 102, except the first-level control card, selects to transmit the data packet outputted from the upper-level control card 10, i.e., the control card 101.

[0049] Specifically, the decoding chip 13 of the control card 10 is used to add 1 to the characteristic value in the E-EDID data in the received data packet and transmit it to the selection chip 12 of the next level control card 10. The decoding chip 13 is also used to decode the characteristic value in the E-EDID data, obtain the display area coordinates of the LED display module 30, and transmit the display data of the display area coordinates to the LED display module 30 through the FPGA14.

[0050] Specifically, the decoding chip 13 of the control card 10 is also used to extract the audio data in the data packet and output the audio data.

[0051] Exemplarily, the decoding chip 13 of the control card 10 further includes an audio extraction insertion module for extracting audio data from the data packet and outputting the audio data.

[0052] refer to Figure 3 The model of the main control chip 11 is RK3566, the model of the selection chip 12 is LT8631UX, and the model of the decoding chip 13 is GSV2011 chip. The control card 10 also includes a USB interface, a PCIE interface, and a Wi-Fi dual-mode BL8821 connected to the RK3566 main control chip, wherein the USB interface is used to connect to a USB flash drive, the PCIE interface is used to connect to a computer PC, and the Wi-Fi dual-mode BL8821 is used for Wi-Fi connection. The first-level control card, i.e., the control card 101, can receive or update data packets from the outside through the USB flash drive, the computer PC, and the Wi-Fi connection.

[0053] The embodiment of the present invention further provides a cascading method for an LED automatic splicing screen, which is executed by the LED automatic splicing screen of any one of the first aspects. The cascading method for an LED automatic splicing screen comprises: the control card 10 of the upper level transmits the data packet to be transmitted to the control card 10 of the lower level through the HDMI interface, wherein the data packet includes: video data, audio data, EDID data, E-EDID data and various auxiliary data.

[0054] In more detail, before transmitting the data packet to the next level control card 10, the upper level control card 10 further includes: adding 1 to the characteristic value in the E-EDID data in the data packet, and the characteristic value is parsed by the next level control card 10 to generate the display area coordinates of the LED display module 30 connected to the next level control card 10. The LED display module 30 displays an image according to the received display data and the display area coordinates.

[0055] The technical solution of the embodiment of the present invention is to cascade multiple control cards in sequence through the HDMI interface, and the display area coordinates of the LED display modules connected to the multiple control cards are automatically set according to the order in which the multiple control cards are cascaded in sequence. If the cascading order of the multiple control cards is changed, the display area coordinates of the LED display modules connected to the multiple control cards will also be automatically adjusted according to the changed cascading order, which solves the problem that the existing LED splicing screen cannot be arbitrarily wired and automatically cascaded, and has the beneficial effects of realizing automatic cascading, arbitrarily changing the wiring order of the control cards in the middle, and each control card can automatically adjust the display coordinates.

[0056] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED automatic splicing screen, characterized in that: The LED automatic splicing screen includes multiple control cards and multiple LED display modules; Each LED display module is connected to a control card; The multiple control cards are cascaded in sequence via the HDMI interface; The display area coordinates of the LED display modules connected to the multiple control cards are automatically set according to the order in which the multiple control cards are cascaded in sequence. If the cascade order of the multiple control cards is changed, the display area coordinates of the LED display modules connected to the multiple control cards will also be automatically adjusted according to the changed cascade order; The control card also includes a main control chip, and a USB interface, a PCIE interface and a Wi-Fi dual-mode connected to the main control chip, wherein the USB interface is used to connect a U disk, the PCIE interface is used to connect a computer, and the Wi-Fi dual-mode is used for Wi-Fi connection; The control card also includes: a main control chip, a gating chip, a decoding chip and an FPGA; The main control chip is connected to the gating chip, the gating chip is connected to the decoding chip, the decoding chip is connected to the FPGA, and the FPGA is connected to the LED display module; The decoding chip of the upper level control card is also connected to the strobe chip of the lower level control card; The multiple control cards include a first-level control card, wherein the first-level control card refers to a control card in which the gate chip is only connected to the main control chip; The main control chip of the first-level control card is used to transmit a data packet to the strobe chip of the first-level control card, and the data packet includes: video data, audio data, EDID data, E-EDID data and various auxiliary data; The decoding chip is used to add 1 to the characteristic value in the E-EDID data in the received data packet and transmit it to the gating chip of the next level control card; The decoding chip is also used to decode the characteristic value in the E-EDID data to obtain the display area coordinates of the LED display module, and transmit the display data of the display area coordinates to the LED display module through the FPGA.

2. The LED automatic splicing screen according to claim 1 is characterized in that: The strobe chip of the control card is used to select the data packet to be transmitted; The gating chip of the first-level control card selects to transmit a data packet outputted by the main control chip of the first-level control card; The strobe chips of other control cards except the first-level control card select to transmit the data packets outputted by the previous-level control card.

3. The LED automatic splicing screen according to claim 1 is characterized in that: The decoding chip is also used to extract the audio data in the data packet and output the audio data.

4. The LED automatic splicing screen according to claim 1, characterized in that: The model of the main control chip is RK3566, the model of the gating chip is LT8631UX, and the model of the decoding chip is GSV2011 chip.

5. A cascading method for an LED automatic splicing screen, characterized in that: Executed by the LED automatic splicing screen according to any one of claims 1 to 4; The cascading method of the LED automatic splicing screen includes: The control card at the upper level transmits the data packets to be transmitted to the control card at the lower level through the HDMI interface, wherein the data packets include: video data, audio data, EDID data, E-EDID data and various auxiliary data; The upper level control card further comprises, before transmitting the data packet to the lower level control card: Add 1 to the characteristic value in the E-EDID data in the data packet, and generate the display area coordinates of the LED display module connected to the next-level control card after the characteristic value is parsed by the next-level control card; The LED display module displays an image according to the received display data and the display area coordinates.

Images