Miniaturized RGB video data line filtering protection circuit and protection device

Abstract

The utility model discloses a miniaturized RGB video data line filtering protection circuit and protection device. The miniaturized RGB video data line filtering protection circuit comprises an RGB video data interface module, a TEE differential mode filtering module and an ESD electrostatic protection module. The RGB video data interface module comprises a first video data interface unit, a second video data interface unit and a third video data interface unit; the TEE differential mode filtering module comprises a first TEE differential mode filtering unit, a second TEE differential mode filtering unit and a third TEE differential mode filtering unit; the first video data interface unit is electrically connected with the first TEE differential mode filtering unit, the second video data interface unit is electrically connected with the second TEE differential mode filtering unit, and the third video data interface unit is electrically connected with the third TEE differential mode filtering unit; the ESD electrostatic protection module is electrically connected with the first TEE differential mode filtering unit, the second TEE differential mode filtering unit and the third TEE differential mode filtering unit. According to the utility model, EM I suppression and EDS electrostatic protection of the RGB video data interface can be effectively realized, the circuit structure is simple, and PCB wiring is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of video signal processing, in particular to a miniaturized RGB video data line filtering protection circuit and a protection device. Background Art

[0002] With the rapid iteration and update of electronic products, the volume and transmission rate of products are also developing towards miniaturization and high speed. As a result, the EM I emission intensity of products is enhanced and complicated, which also puts forward higher requirements on the treatment measures to suppress EM I. Of course, the volume and process requirements of filtering protection devices are also constantly increasing. In the process of dealing with EM I problems, the processing of RGB video data lines has always been a technical problem, because RGB video data lines are also mixed with clock interference when transmitting data. RGB video data transmission is a unique data plus clock transmission method. This transmission method can better handle EM I problems when the PCB board of the product is large enough.

[0003] At present, miniaturization of products is a trend. The EMI problem of RGB video data lines faces the problem of too small PCB board, which makes it difficult to filter. In the prior art, the existing EMI problem treatment methods of RGB video data lines have the following problems: 1) The effect of suppressing EMI is not significant enough, and it is impossible to take into account the EMI emission suppression of a wide frequency band; 2) There are many RGB data lines, and filtering measures will occupy a large amount of board space after adding; 3) After filtering solutions such as RC absorption circuits are added, the video data routing is not beautiful and may cause other noise coupling problems. Therefore, inventing a miniaturized RGB video data line filtering protection circuit and protection device is an urgent problem to be solved by technicians in this field. Utility Model Content

[0004] The purpose of this application is to provide a miniaturized RGB video data line filter protection circuit and protection device. In this solution, it is intended to solve the EMI radiation emission and electrostatic protection problems of RGB video data ports, especially for products with small size, high power, limited PCB board space and ports with RGB video transmission.

[0005] In order to solve the above technical problems, the present application provides a miniaturized RGB video data line filter protection circuit, including an RGB video data interface module, a TEE differential mode filter module and an ESD electrostatic protection module; the RGB video data interface module includes a first video data interface unit, a second video data interface unit and a third video data interface unit; the TEE differential mode filter module includes a first TEE differential mode filter unit, a second TEE differential mode filter unit and a third TEE differential mode filter unit;

[0006] The first video data interface unit is electrically connected to the first TEE differential mode filter unit, the second video data interface unit is electrically connected to the second TEE differential mode filter unit, and the third video data interface unit is electrically connected to the third TEE differential mode filter unit;

[0007] The ESD electrostatic protection module is electrically connected to the first TEE differential mode filter unit, the second TEE differential mode filter unit and the third TEE differential mode filter unit respectively.

[0008] Preferably, the ESD electrostatic protection module includes a first ESD electrostatic protection unit, a second ESD electrostatic protection unit and a third ESD electrostatic protection unit;

[0009] The first ESD electrostatic protection unit is electrically connected to the first TEE differential mode filter unit, the second ESD electrostatic protection unit is electrically connected to the second TEE differential mode filter unit, and the third ESD electrostatic protection unit is electrically connected to the third TEE differential mode filter unit.

[0010] Preferably, the first TEE differential mode filtering unit comprises a first TEE differential mode filtering device;

[0011] The first TEE differential mode filter device is electrically connected to the first video data interface unit and the ESD electrostatic protection module respectively.

[0012] Preferably, the second TEE differential mode filtering unit comprises a second TEE differential mode filtering device;

[0013] The second TEE differential mode filter device is electrically connected to the second video data interface unit and the ESD electrostatic protection module respectively.

[0014] Preferably, the third TEE differential mode filtering unit comprises a third TEE differential mode filtering device;

[0015] The third TEE differential mode filter device is electrically connected to the third video data interface unit and the ESD electrostatic protection module respectively.

[0016] Preferably, the first ESD electrostatic protection unit comprises a first four-channel integrated electrostatic protection device;

[0017] The first four-channel integrated electrostatic protection device is electrically connected to the first TEE differential mode filter device.

[0018] Preferably, the second ESD electrostatic protection unit comprises a second four-channel integrated electrostatic protection device;

[0019] The second four-channel integrated electrostatic protection device is electrically connected to the second TEE differential mode filter device.

[0020] Preferably, the third ESD electrostatic protection unit comprises a third four-channel integrated electrostatic protection device;

[0021] The third four-channel integrated electrostatic protection device is electrically connected to the third TEE differential mode filter device.

[0022] In order to solve the above technical problems, the present application provides a miniaturized RGB video data line filter protection device, including a miniaturized RGB video data line filter protection circuit.

[0023] A miniaturized RGB video data line filter protection circuit and protection device of the utility model have the following beneficial effects. A miniaturized RGB video data line filter protection circuit disclosed by the utility model includes: an RGB video data interface module, a TEE differential mode filter module and an ESD electrostatic protection module; the RGB video data interface module includes a first video data interface unit, a second video data interface unit and a third video data interface unit; the TEE differential mode filter module includes a first TEE differential mode filter unit, a second TEE differential mode filter unit and a third TEE differential mode filter unit; the first video data interface unit is electrically connected to the first TEE differential mode filter unit, the second video data interface unit is electrically connected to the second TEE differential mode filter unit, and the third video data interface unit is electrically connected to the third TEE differential mode filter unit; the ESD electrostatic protection module is electrically connected to the first TEE differential mode filter unit, the second TEE differential mode filter unit and the third TEE differential mode filter unit respectively. The utility model can effectively realize EMI suppression and EDS electrostatic protection of the RGB video data interface, and the circuit structure is simple and convenient for PCB wiring. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0025] Figure 1 It is a principle block diagram of a miniaturized RGB video data line filter protection circuit of a preferred embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of the principle of another miniaturized RGB video data line filter protection circuit of a preferred embodiment of the utility model;

[0027] Figure 3 It is a circuit schematic diagram of an RGB video data interface module of a miniaturized RGB video data line filter protection circuit of a preferred embodiment of the utility model;

[0028] Figure 4 It is a circuit schematic diagram of a TEE differential mode filter module and an ESD electrostatic protection module of a miniaturized RGB video data line filter protection circuit of a preferred embodiment of the utility model;

[0029] Figure 5 It is a device diagram of a TEE differential mode filter device of a miniaturized RGB video data line filter protection circuit in a preferred embodiment of the utility model;

[0030] Figure 6 This is a schematic circuit diagram of a single-channel TEE filter of a miniaturized RGB video data line filter protection circuit in a preferred embodiment of the utility model;

[0031] Figure 7 It is a filter-free EMI test data and line graph of a preferred embodiment of the utility model;

[0032] Figure 8 This is the EM I test data and line graph after adding RC absorption in a preferred embodiment of the utility model;

[0033] Fig. 9 It is an EMI test data and a line graph after adding a TEE filter according to a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0034] The core of this application is to provide a miniaturized RGB video data line filter protection circuit and protection device. In this solution, it is intended to solve the EMI radiation emission and electrostatic protection problems of the RGB video data port, especially for products with small size, high power, limited PCB board space and ports with RGB video transmission.

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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.

[0036] See also Figure 1 , Figure 1A schematic diagram of a principle block diagram of a miniaturized RGB video data line filter protection circuit provided in the present application includes an RGB video data interface module 1, a TEE differential mode filter module 2 and an ESD electrostatic protection module 3; the RGB video data interface module 1 includes a first video data interface unit 11, a second video data interface unit 12 and a third video data interface unit 13; the TEE differential mode filter module 2 includes a first TEE differential mode filter unit 21, a second TEE differential mode filter unit 22 and a third TEE differential mode filter unit 23;

[0037] The first video data interface unit 11 is electrically connected to the first TEE differential mode filter unit 21, the second video data interface unit 12 is electrically connected to the second TEE differential mode filter unit 22, and the third video data interface unit 13 is electrically connected to the third TEE differential mode filter unit 23;

[0038] The ESD protection module 3 is electrically connected to the first TEE differential mode filter unit 21 , the second TEE differential mode filter unit 22 and the third TEE differential mode filter unit 23 , respectively.

[0039] In the prior art, the existing methods for dealing with the EMI problem of RGB video data lines have the following problems: 1) the effect of suppressing EMI is not significant enough, and it is impossible to take into account the EMI emission suppression in a wide frequency band; 2) there are many RGB data lines, and filtering measures will occupy a large amount of board space after adding them; 3) after filtering solutions such as RC absorption circuits are added, the video data routing is not beautiful and may cause other noise coupling problems.

[0040] In view of the above shortcomings, in this application, the EMI suppression and EDS electrostatic protection of the RGB video data interface are achieved through the cooperation of the RGB video data interface module 1, the TEE differential mode filter module 2 and the ESD electrostatic protection module 3.

[0041] Specifically, the present application is applied to the RGB video data port circuit, which integrates the capabilities of differential mode noise filtering and electrostatic protection. The RGB video data interface module is used to filter differential mode noise, and the ESD electrostatic protection module 3 is used to provide electrostatic protection capability. The present application has strong differential mode filtering capability and electrostatic protection capability. In addition, the circuit of the present application is small in size and the PCB board space is compact.

[0042] Specifically, in this embodiment, the first TEE differential mode filter unit 21, the second TEE differential mode filter unit 22 and the third TEE differential mode filter unit 23 are used to filter out the differential mode noise of the data clamp clock brought out by the RGB video data routing.

[0043] Specifically, it can be understood that the first TEE differential mode filter unit 21, the second TEE differential mode filter unit 22 and the third TEE differential mode filter unit 23 not only ensure the filtering effect, but also occupy a small PCB space, which is conducive to PCB wiring.

[0044] In summary, the present application provides a miniaturized RGB video data line filter protection circuit, which includes an RGB video data interface module 1, a TEE differential mode filter module 2 and an ESD electrostatic protection module 3 in this solution; the RGB video data interface module 1 includes a first video data interface unit 11, a second video data interface unit 12 and a third video data interface unit 13; the TEE differential mode filter module 2 includes a first TEE differential mode filter unit 21, a second TEE differential mode filter unit 22 and a third TEE differential mode filter unit 23; the first video data interface unit 11 is electrically connected to the first TEE differential mode filter unit 21, the second video data interface unit 12 is electrically connected to the second TEE differential mode filter unit, and the third video data interface unit 13 is electrically connected to the third TEE differential mode filter unit 23; the ESD electrostatic protection module 3 is electrically connected to the first TEE differential mode filter unit 21, the second TEE differential mode filter unit 22 and the third TEE differential mode filter unit 23 respectively. The utility model can effectively realize EMI suppression and EDS electrostatic protection of the RGB video data interface, has a simple circuit structure, and is convenient for PCB wiring.

[0045] Based on the above embodiments:

[0046] Please refer to Figure 2 , Figure 2 A schematic diagram of the principle block diagram of a miniaturized RGB video data line filtering protection circuit provided in the present application.

[0047] As a preferred embodiment, the ESD electrostatic protection module 3 includes a first ESD electrostatic protection unit 31, a second ESD electrostatic protection unit 32 and a third ESD electrostatic protection unit 33;

[0048] The first ESD electrostatic protection unit 31 is electrically connected to the first TEE differential mode filter unit 21 , the second ESD electrostatic protection unit 32 is electrically connected to the second TEE differential mode filter unit 22 , and the third ESD electrostatic protection unit 33 is electrically connected to the third TEE differential mode filter unit 23 .

[0049] Please refer to Figure 3 , Figure 3 A circuit schematic diagram of an RGB video data interface module provided in this application.

[0050] Please refer to Figure 4 , Figure 4 A circuit schematic diagram of a TEE differential mode filter module provided in this application.

[0051] As a preferred embodiment, the first TEE differential mode filtering unit 21 includes a first TEE differential mode filtering device;

[0052] The first TEE differential mode filter device is electrically connected to the first video data interface unit 11 and the ESD electrostatic protection module 3 respectively.

[0053] As a preferred embodiment, the second TEE differential mode filtering unit includes a second TEE differential mode filtering device;

[0054] The second TEE differential mode filter device is electrically connected to the second video data interface unit 12 and the ESD electrostatic protection module 3 respectively.

[0055] As a preferred embodiment, the third TEE differential mode filtering unit includes a third TEE differential mode filtering device;

[0056] The third TEE differential mode filter device is electrically connected to the third video data interface unit 13 and the ESD electrostatic protection module 3 respectively.

[0057] Please refer to Figure 5 , Figure 5 A schematic diagram of a TEE differential mode filter device provided in this application.

[0058] Please refer to Figure 6 , Figure 6 A schematic diagram of a single-channel circuit of a TEE filter provided in this application.

[0059] Specifically, in this embodiment, Figure 5 This is a simplified diagram of the TEE filter device, where A1-A4 are the four filter channels of the filter. Each device can filter four data lines. The left and right are the two ground pins of the device.

[0060] Specifically, Figure 6 It is a highly integrated filter circuit inside the TEE filter device. The circuit of each channel is equivalent to a π-type filter circuit. Compared with the RC absorption circuit, the π-type filter circuit can effectively suppress differential mode noise. In addition, the multiple grounding pins of the TEE filter device provide a better grounding effect, reduce the generation of grounding parasitic inductance, and have a good filtering effect. The front and rear pole capacitors of the π-type filter circuit improve the circuit's electrostatic interference discharge capability.

[0061] Please refer to Figure 7 , Figure 7 A filter-free EMI test data and line graph provided for this application.

[0062] Please refer to Figure 8 , Figure 8 This is the EMI test data and line graph after adding RC absorption provided by this application.

[0063] Please refer to Fig. 9 , Fig. 9 This application provides EMI test data and line graph after adding a TEE filter.

[0064] It is worth noting that, under the premise of sufficient board space, the most common filtering circuit for existing RGB video data routing is to consider adding an RC absorption circuit to each data routing, but this will lead to a large waste of board space, and the routing will also be staggered and re-coupled with each other, resulting in poor grounding effect. Therefore, the TEE filtering circuit of this application can reduce space occupancy and improve filtering effect.

[0065] As a preferred embodiment, the first ESD electrostatic protection unit includes a first four-channel integrated electrostatic protection device;

[0066] The first four-channel integrated electrostatic protection device is electrically connected to the first TEE differential mode filter device.

[0067] As a preferred embodiment, the second ESD electrostatic protection unit includes a second four-channel integrated electrostatic protection device;

[0068] The second four-channel integrated electrostatic protection device is electrically connected to the second TEE differential mode filter device.

[0069] As a preferred embodiment, the third ESD electrostatic protection unit includes a third four-channel integrated electrostatic protection device;

[0070] The third four-channel integrated electrostatic protection device is electrically connected to the third TEE differential mode filter device.

[0071] Specifically, the four-channel integrated electrostatic protection device used in this application is an integrated device, which has the advantage of small size in space, and the two grounded pins of the four-channel integrated electrostatic protection device provide better electrostatic discharge capability. It is understandable that the RGB video line involves hot plugging and electrostatic contact with the screen, so the electrostatic protection capability of the RGB data line can effectively prevent chip pin damage.

[0072] The present application also provides a miniaturized RGB video data line filter protection device, including a miniaturized RGB video data line filter protection circuit.

[0073] For an introduction to a miniaturized RGB video data line filter protection circuit provided in the present application, please refer to the above-mentioned embodiment, and the present application will not go into details here.

[0074] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0075] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A miniaturized RGB video data line filter protection circuit, characterized in that: It includes an RGB video data interface module, a TEE differential mode filter module and an ESD electrostatic protection module; the RGB video data interface module includes a first video data interface unit, a second video data interface unit and a third video data interface unit; the TEE differential mode filter module includes a first TEE differential mode filter unit, a second TEE differential mode filter unit and a third TEE differential mode filter unit; The first video data interface unit is electrically connected to the first TEE differential mode filter unit, the second video data interface unit is electrically connected to the second TEE differential mode filter unit, and the third video data interface unit is electrically connected to the third TEE differential mode filter unit; The ESD electrostatic protection module is electrically connected to the first TEE differential mode filter unit, the second TEE differential mode filter unit and the third TEE differential mode filter unit respectively.

2. A miniaturized RGB video data line filter protection circuit according to claim 1, characterized in that: The ESD electrostatic protection module includes a first ESD electrostatic protection unit, a second ESD electrostatic protection unit and a third ESD electrostatic protection unit; The first ESD electrostatic protection unit is electrically connected to the first TEE differential mode filter unit, the second ESD electrostatic protection unit is electrically connected to the second TEE differential mode filter unit, and the third ESD electrostatic protection unit is electrically connected to the third TEE differential mode filter unit.

3. A miniaturized RGB video data line filter protection circuit according to claim 2, characterized in that: The first TEE differential mode filtering unit comprises a first TEE differential mode filtering device; The first TEE differential mode filter device is electrically connected to the first video data interface unit and the ESD electrostatic protection module respectively.

4. A miniaturized RGB video data line filter protection circuit according to claim 2, characterized in that: The second TEE differential mode filtering unit includes a second TEE differential mode filtering device; The second TEE differential mode filter device is electrically connected to the second video data interface unit and the ESD electrostatic protection module respectively.

5. A miniaturized RGB video data line filter protection circuit according to claim 2, characterized in that: The third TEE differential mode filtering unit includes a third TEE differential mode filtering device; The third TEE differential mode filter device is electrically connected to the third video data interface unit and the ESD electrostatic protection module respectively.

6. A miniaturized RGB video data line filter protection circuit according to claim 3, characterized in that: The first ESD electrostatic protection unit includes a first four-channel integrated electrostatic protection device; The first four-channel integrated electrostatic protection device is electrically connected to the first TEE differential mode filter device.

7. A miniaturized RGB video data line filter protection circuit according to claim 4, characterized in that: The second ESD electrostatic protection unit includes a second four-channel integrated electrostatic protection device; The second four-channel integrated electrostatic protection device is electrically connected to the second TEE differential mode filter device.

8. A miniaturized RGB video data line filter protection circuit according to claim 5, characterized in that: The third ESD electrostatic protection unit includes a third four-channel integrated electrostatic protection device; The third four-channel integrated electrostatic protection device is electrically connected to the third TEE differential mode filter device.

9. A miniaturized RGB video data line filter protection device, characterized in that: A miniaturized RGB video data line filter protection circuit comprising any one of claims 1 to 8.

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