CN117198189A

CN117198189A - Display device

Info

Publication number: CN117198189A
Application number: CN202311183324.9A
Authority: CN
Inventors: 张正光; 张艺才; 王大可; 李天马; 任绥民; 林兴月; 刘凡; 陈锐
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2023-09-13
Filing date: 2023-09-13
Publication date: 2023-12-08

Abstract

The present disclosure provides a display device, including display panel, backlight unit and be used for driving display panel with the circuit board of backlight unit, wherein, the circuit board includes: a first electromagnetic shielding portion disposed on a first surface of the circuit board and configured to: shielding electromagnetic interference on the display panel; a second electromagnetic shield portion provided on a second surface of the circuit board opposite to the first surface, and configured to: shielding electromagnetic interference on the backlight module; a filter circuit electrically coupled to the first electromagnetic shield and the second electromagnetic shield, respectively, and configured to: and filtering the noise signal in the display device between the display panel and the backlight module. The display device realizes the balance of electromagnetic interference capability and electromagnetic interference immunity capability, and improves the electromagnetic compatibility capability of the display device.

Description

Display device

Technical Field

The disclosure relates to the field of display technologies, and in particular, to a display device.

Background

With the progress of technology, display devices have been widely used in a variety of electronic products in various fields. As the functions of electronic products are increasingly complex, electronic circuits in display devices are increasingly complex, and the problem of electromagnetic compatibility becomes one of the important problems of circuit design.

Electromagnetic compatibility (EMC) includes electromagnetic interference (EMI) and electromagnetic immunity (EMS), which have a relationship of mutual restriction in improvement, and both are difficult to improve at the same time.

In view of this, how to balance the electromagnetic interference capability and the electromagnetic immunity capability and improve the electromagnetic compatibility capability of the display device has become an important research problem.

Disclosure of Invention

Accordingly, an object of the present disclosure is to provide a display device for solving or partially solving the above-mentioned problems.

In view of the above object, a first aspect of the present disclosure provides a display device including:

display panel, backlight unit and be used for driving the display panel with the circuit board of backlight unit, wherein, the circuit board includes:

a first electromagnetic shielding portion disposed on a first surface of the circuit board and configured to: shielding electromagnetic interference on the display panel;

a second electromagnetic shield portion provided on a second surface of the circuit board opposite to the first surface, and configured to: shielding electromagnetic interference on the backlight module;

a filter circuit electrically coupled to the first electromagnetic shield and the second electromagnetic shield, respectively, and configured to: and filtering the noise signal in the display device between the display panel and the backlight module.

In some embodiments, the filtering circuit is configured to:

blocking noise signals with the frequency smaller than a first preset frequency in the display device; and/or

Carrying out backflow on noise signals with the frequency larger than a second preset frequency in the display device;

wherein the first preset frequency is less than or equal to the second preset frequency.

In some embodiments, the second surface of the circuit board faces the backlight module, and the second electromagnetic shielding portion is in contact with the backlight module.

In some embodiments, the first electromagnetic shield includes a conductive region disposed on a first side of the circuit board; and/or the second electromagnetic shielding part comprises a conductive area arranged on the second surface of the circuit board.

In some embodiments, the filter circuit includes a first resistor and a first capacitor connected in parallel with the first capacitor, a first end of the first resistor and the first capacitor electrically coupled to the first electromagnetic shield, and a second end of the first resistor and the first capacitor electrically coupled to the second electromagnetic shield.

In some embodiments, the filter circuit includes a second resistor having one end electrically coupled to the first electromagnetic shield and the other end electrically coupled to the second electromagnetic shield, wherein the second resistor has a resistance value of 10 ⁵ Ohmic; and/or

The filter circuit comprises a second capacitor, one end of the second capacitor is electrically coupled with the first electromagnetic shielding part, and the other end of the second capacitor is electrically coupled with the second electromagnetic shielding part.

In some embodiments, the filter circuit includes a magnetic bead device having one end electrically coupled to the first electromagnetic shield and the other end electrically coupled to the second electromagnetic shield.

In some embodiments, the display device further comprises an electromagnetic shielding tape and a housing assembly;

the shell component is fixedly connected with the backlight module;

the shell component comprises a rear shell, the circuit board is arranged between the backlight module and the rear shell, and the first surface of the circuit board faces the rear shell;

the electromagnetic shielding tape is arranged on the first surface of the circuit board and covers the first electromagnetic shielding part.

In some embodiments, the circuit board includes at least two first electromagnetic shielding portions, the first electromagnetic shielding portions are electrically insulated from each other, and the electromagnetic shielding tape covers the at least two first electromagnetic shielding portions.

In some embodiments, the orthographic projection of the electromagnetic shielding tape on the rear housing is located in or overlaps with the orthographic projection of the circuit board on the rear housing.

In some embodiments, at least one side edge of the first electromagnetic shield is flush with a same side edge of the first face of the circuit board; and/or at least one side edge of the second electromagnetic shield is flush with the same side edge of the second face of the circuit board.

From the above, it can be seen that the present disclosure provides a display device, which connects a first electromagnetic shielding portion disposed on a first surface of a circuit board and a second electromagnetic shielding portion disposed on a second surface of the circuit board through a filter circuit, so as to implement filtering processing on noise signals in the display device between a display panel and a backlight module, and improve electromagnetic interference capability of the display device. Simultaneously, electromagnetic interference on the display panel is shielded through the first electromagnetic shielding part, and electromagnetic interference on the backlight module is shielded through the second electromagnetic shielding part, so that the blocking of external noise is realized, and the electromagnetic anti-interference capability of the display device is improved. The electromagnetic interference resistance of the display device is guaranteed while the electromagnetic interference resistance of the display device is improved, the balance of the electromagnetic interference resistance and the electromagnetic interference resistance is realized, and the electromagnetic compatibility of the display device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure or related art, the drawings required for the embodiments or related art description will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.

Fig. 1A shows a schematic diagram of an exemplary display device provided by an embodiment of the present disclosure.

Fig. 1B shows a schematic diagram of an exemplary circuit board of an embodiment of the present disclosure.

Fig. 1C illustrates a schematic cross-sectional structure of an exemplary display device provided by an embodiment of the present disclosure.

Fig. 2 shows a schematic diagram of an exemplary filtering circuit according to an embodiment of the present disclosure.

Fig. 3 shows a schematic diagram of another exemplary filtering circuit according to an embodiment of the present disclosure.

Fig. 4 shows a schematic diagram of another exemplary filtering circuit according to an embodiment of the present disclosure.

Fig. 5 shows a schematic diagram of another exemplary filtering circuit according to an embodiment of the present disclosure.

Fig. 6 shows a schematic diagram of another exemplary filtering circuit according to an embodiment of the present disclosure.

Fig. 7 shows a schematic diagram of another exemplary filtering circuit according to an embodiment of the present disclosure.

Detailed Description

For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in embodiments of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

The terms involved in the embodiments of the present disclosure are explained as follows:

EMC: i.e. electromagnetic compatibility (Electromagnetic Compatibility, EMC), requires that the power supply module and other electronic devices have no serious sources and devices inside, or that the power supply system has a good anti-interference capability.

EMI: electromagnetic interference (Electromagnetic Interference, EMI), which refers to electromagnetic waves generated by electronic devices during their own operation, emits externally and causes interference to other parts of the device or to other external devices.

EMS: electromagnetic immunity (Electromagnetic Susceptibility, EMS), refers to the sensitivity of an electronic device to electromagnetic interference.

Fig. 1A shows a schematic diagram of an exemplary display device 100 provided by an embodiment of the present disclosure.

As shown in fig. 1A, the display device 100 may include: the backlight module 102 is arranged on the backlight side of the display panel 101 and provides backlight for the display panel 101, the circuit board 103 is electrically coupled with the display panel 101 and the backlight module 102 respectively, and the display panel 101 and the backlight module 102 are driven through the circuit board 103, so that the display panel 101 is controlled to display and the backlight module 102 is controlled to emit light. The display panel 101, the backlight module 102 and the circuit board 103 may be disposed in the housing assembly 104, and the display device 100 is assembled by connecting (e.g. by screw fixing) the display panel 101 and the backlight module 102 with the housing assembly 104.

In some embodiments, in order to improve electromagnetic compatibility of the display apparatus 100, an electromagnetic shielding member may be provided in the display apparatus 100. For example, an electromagnetic shielding portion (e.g., a ground portion (GND)) may be provided on the circuit board 103 to realize an electromagnetic shielding function, and electromagnetic shielding performance may be further improved by attaching an electromagnetic shielding tape (e.g., EMI tape).

In order to secure electromagnetic shielding performance of the display device 100, the display device 100 may be subjected to an EMC test, which further includes an EMI test and an EMS test. Wherein, EMI is electromagnetic interference, and is a measure of the interference degree of the display panel 101 to the whole machine in use. The EMS is an electromagnetic immunity test that measures the ability of the display panel 101 to withstand external disturbances. Generally, the better the conduction performance between the electromagnetic shielding parts of the whole machine parts of the display device is, the faster the noise signal of the display module is released, the better the EMI performance is, and meanwhile, the external noise is easier to be conducted to the display module, so that the EMS capability of the display module is deteriorated. How to improve EMC capability and balance EMC and EMS has been an important point of circuit design. Moreover, the debugging improvement of EMC often involves modification of the PCB design, taking much time and effort.

The inventor of the present disclosure found that in the related art, the complete machine of the display device, the backlight module, and the electromagnetic shielding portion of the display panel are conductive, and when the EMC test is performed, the noise of the complete machine is conducted to the display panel through the mutually conductive electromagnetic shielding portions, which affects the normal operation of the display panel, and also makes the display panel perform poorly in the EMC test.

In view of this, in some embodiments, as shown in fig. 1A, the circuit board 103 may further include a first electromagnetic shielding portion 1031, a second electromagnetic shielding portion 1032, and a filtering circuit 1033 therein.

Fig. 1B shows a schematic diagram of an exemplary circuit board 103 according to an embodiment of the present disclosure.

As shown in fig. 1B, in some embodiments, the first electromagnetic shielding portion 1031 is disposed with a first face 103A of the circuit board 103, and the circuit board 103 is electrically coupled with the display panel 101 for providing driving signals to the display panel 101. Illustratively, the electrical coupling of the circuit board 103 to the display panel 101 may be accomplished using a Bonding (Bonding) process. The first electromagnetic shielding portion 1031 can shield electromagnetic interference on the display panel 101, so as to reduce the influence of electromagnetic interference signals on the normal use of the display device.

The second electromagnetic shielding portion 1032 is provided on a second surface 103B (shown with reference to fig. 2) of the circuit board 103. Wherein the second surface is disposed opposite to the first surface, the second electromagnetic shielding portion 1032 is disposed on a surface of the circuit board 103 opposite to the first surface 103A (i.e., a back surface of the first surface 103A) as indicated by a dotted line in fig. 1B. The second electromagnetic shielding portion 1032 can shield electromagnetic interference on the backlight module 102. In some embodiments, the second electromagnetic shielding portion 1032 may also shield electromagnetic interference of the entire display device 100.

The filter circuit 1033 is electrically coupled to the first electromagnetic shielding portion 1031 and the second electromagnetic shielding portion 1032, respectively, so that the filter circuit 1033 is used to filter noise signals between the display panel 101 and the backlight module 102. Optionally, the noise signal includes a noise signal generated by the display device 100 during operation and an external noise signal in an environment where the display device 100 is located. The filtering circuit 1033 is used for filtering noise signals in the display device, so that the electromagnetic interference capability of the display device 100 is ensured, and meanwhile, the electromagnetic interference rejection capability of the display device 100 is improved, and the electromagnetic compatibility capability of the display device 100 is further improved. In addition, by providing the first electromagnetic shielding portion 1031 for electromagnetically shielding the display panel 101 and the second electromagnetic shielding portion 1032 for electromagnetically shielding the backlight unit 102 on both sides of the circuit board 103, noise isolation between the display panel 101 and the backlight unit 102 can be better achieved, and the electromagnetic compatibility of the display device 100 can be further improved.

In some embodiments, the circuit board 103 includes at least two first electromagnetic shielding portions 1031, and the first electromagnetic shielding portions 1031 are electrically insulated from each other. As shown in fig. 1B, first electromagnetic shielding portions 1031A and 1031B are provided on both sides of a first surface 103A of the circuit board 103, respectively. By providing the first electromagnetic shielding portion at different portions of the first surface 103A of the circuit board 103, the electromagnetic shielding effect can be better achieved. In some embodiments, in order to ensure electromagnetic compatibility of the display device 100, a filter circuit may be disposed between each of the first electromagnetic shielding portions and the second electromagnetic shielding portions 1032, where the filter circuit may be one or more, and each filter circuit corresponds to one of the first electromagnetic shielding portions.

Fig. 1C illustrates a schematic cross-sectional structure of an exemplary display device 100 provided by an embodiment of the present disclosure.

In some embodiments, as shown in fig. 1C, along the light emitting direction (upward direction in fig. 1C) of the display device 100, the display device 100 may include a circuit board 103, a backlight module 102 and a display panel 101 that are stacked, and a housing assembly 104 is used to fix the circuit board 103, the backlight module 102 and the display panel 101, thereby realizing a complete machine assembly. It should be noted that the housing assembly 104 is shown in fig. 1C by way of example only, and it is understood that the housing assembly 104 may be formed of multiple parts, such as a rear shell, a middle frame, an outer frame, and the like. As shown in fig. 1C, the housing assembly 104 may include a rear housing 1041 located on a backlight side of the display device 100, a first surface 103A of the circuit board 103 faces the rear housing 1041, a second surface 103B of the circuit board 103 faces the backlight module 102, and the second electromagnetic shielding portion 1032 contacts the backlight module 102, so as to better shield electromagnetic interference on the backlight module 102.

Returning to fig. 1B, in some embodiments, the first electromagnetic shield 1031 includes a conductive region disposed on the first side 103A of the circuit board 103, and illustratively, the first electromagnetic shield 1031 includes an exposed metal region disposed on the first side 103A of the circuit board 103, e.g., the exposed metal region is a copper-exposed region. In this way, by providing a planar conductive region, electromagnetic shielding can be performed better while reducing the overall thickness of the display device 100.

In some embodiments, as shown in fig. 1B, the second electromagnetic shield 1032 includes a conductive region disposed on the second side 103B of the circuit board 103, and illustratively, the second electromagnetic shield 1032 includes an exposed metal region disposed on the second side of the circuit board 103, e.g., the exposed metal region is a copper-exposed region. In this way, by providing a planar conductive region, electromagnetic shielding can be performed better while reducing the overall thickness of the display device 100. In some embodiments, as shown in fig. 1B, at least one side edge of the first electromagnetic shielding portion 1031 is flush with the same side edge of the first surface of the circuit board 103, so that a better electromagnetic shielding effect can be achieved. In some embodiments, as shown in fig. 1B, at least one side edge of the second electromagnetic shielding portion 1032 is flush with the same side edge of the second surface of the circuit board 103, so that a better electromagnetic shielding effect can be achieved.

Fig. 2 shows a schematic diagram of an exemplary filtering circuit according to an embodiment of the present disclosure. Wherein the first side 103A and the second side 103B of the circuit board 103 are shown separately for clarity of illustration.

In some embodiments, as shown in fig. 2, the filter circuit 1033 includes a first resistor R1 and a first capacitor C1, where the first resistor R1 is connected in parallel with the first capacitor C1 to form a resistor-capacitor parallel circuit. The first resistor R1 is electrically coupled to the first electromagnetic shielding portion 1031 at a first end of the first capacitor C1, and the first resistor R1 is electrically coupled to the second electromagnetic shielding portion 1032 at a second end of the first capacitor C1.

In practical application, when a first noise signal (for example, a low-frequency noise signal) with a frequency smaller than a first preset frequency exists in the display device, the impedance value of the filter circuit 1033 approaches to the resistance value of the first resistor R1, so that the overall resistance value in the circuit board 103 is increased, the filter circuit 1033 can be utilized to block the first noise signal, and the use influence of the noise signal on the display device is reduced.

When there is a second noise signal (e.g., a high-frequency noise signal) with a frequency greater than a second preset frequency in the display device, the first preset frequency is less than or equal to the second preset frequency, and the impedance value of the filter circuit 1033 is close to zero, so that the display panel 101 and the backlight module 102 are close to be conducted, the release rate of the noise signal generated when the display device operates is improved, and noise backflow is realized.

Alternatively, to achieve a better filtering effect, the resistance value of the first resistor R1 may be 100kΩ, and the capacitance value of the first capacitor C1 may be 100nF.

In some embodiments, as shown in fig. 3, when the number of the first resistors R1 is plural, the number of the first capacitors C1 is plural, the secondary resistor-capacitor filter circuit 1033 or the multiple resistor-capacitor filter circuits 1033 may be formed. Illustratively, when the filter circuit 1033 is a secondary resistor-capacitor filter circuit 1033, the number of the first resistors R1 is two, and the number of the first capacitors C1 is two.

By the above scheme, when noise signals with the frequency lower than the first preset frequency exist in the display device, blocking processing is performed, crosstalk between the display panel 101 and the backlight module 102 is avoided, performance of the display device is affected, and electromagnetic anti-interference capability of the display device is enhanced. When the noise signal with the frequency larger than the second preset frequency exists in the display device, such as the noise signal generated by the operation of the display device, the noise reflux is realized, and the basic electromagnetic interference capability of the display device is maintained.

In some embodiments, as shown in fig. 4, the filter circuit 1033 includes a second resistor R2. Optionally, the resistance value of the second resistor R2 is 10 ⁵ Ohm, one end of the second resistor R2 is connected with the first electromagnetic screenThe shielding part 1031 is electrically coupled, and the other end of the second resistor R2 is electrically coupled to the second electromagnetic shielding part 1032. By separately connecting the second resistor R2 with a large resistance in series between the first electromagnetic shielding portion 1031 and the second electromagnetic shielding portion 1032, an effect of blocking noise signals with all frequencies is achieved, and an influence of the noise signals on the display device is reduced to a greater extent.

In some embodiments, as shown in fig. 5, the filter circuit 1033 includes a second capacitance C2. One end of the second capacitor C2 is electrically coupled to the first electromagnetic shielding portion 1031, and the other end of the second capacitor C2 is electrically coupled to the second electromagnetic shielding portion 1032. By individually connecting the second capacitor C2 in series between the first electromagnetic shielding part 1031 and the second electromagnetic shielding part 1032, the first electromagnetic shielding part 1031 is connected in series with the second capacitor C2 and the second electromagnetic shielding part 1032, that is, the first electromagnetic shielding part 1031 is disconnected from the second electromagnetic shielding part 1032. When in later debugging, if specific frequency points need to be filtered, other filter circuits can be replaced by capacitors, so that the debugging is convenient.

In some embodiments, as shown in fig. 6, the filter circuit 1033 includes a third resistor R3. Optionally, the resistance value of the third resistor R3 is zero ohm, one end of the third resistor R3 is electrically coupled to the first electromagnetic shielding portion 1031, and the other end of the third resistor R3 is electrically coupled to the second electromagnetic shielding portion 1032. By separately connecting the third resistor R3 with zero ohm between the first electromagnetic shielding portion 1031 and the second electromagnetic shielding portion 1032 in series, the first electromagnetic shielding portion 1031 is directly connected with the second electromagnetic shielding portion 1032, that is, the display panel 101, the circuit board 103 and the backlight module 102 are directly connected, so that the release rate of noise signals generated by the display device during operation is accelerated, and the electromagnetic interference capability of the display device is improved. In the later debugging process, if the whole machine, the display panel 101 and the backlight module 102 are required to be turned on, only other filter circuits are required to be replaced by zero ohm resistors.

In some embodiments, as shown in fig. 7, the filtering circuit 1033 includes a bead device FB. One end of the bead device FB is electrically coupled to the first electromagnetic shielding part 1031, and the other end of the bead device FB is electrically coupled to the second electromagnetic shielding part 1032. And when a third noise signal with the frequency larger than a third preset frequency exists in the display device, blocking the third noise signal, wherein the third preset frequency is larger than or equal to the second preset frequency.

By the above scheme, the magnetic bead device FB is connected in series between the first electromagnetic shielding portion 1031 and the second electromagnetic shielding portion 1032, so that the filtering processing of the noise signal with the specific frequency in the display device is realized, and the performance noise influence on the display device is avoided. When in later debugging, if the specific frequency point is required to be filtered, other filter circuits can be replaced by magnetic beads, so that the debugging is convenient.

In some embodiments, the display device further includes an electromagnetic shielding tape (not shown in the drawings) disposed on the first surface 103A of the circuit board 103 and covering the first electromagnetic shielding part 1031. Illustratively, the electromagnetic shielding tape is a black tape (EMI tape).

Electromagnetic interference is conducted in space and in contact, and electromagnetic shielding adhesive tape is used for attaching the first surface of the circuit board 103, so that electromagnetic interference conducted through space is reduced. Meanwhile, the electromagnetic shielding tape covers the first electromagnetic shielding part of the first surface of the circuit board 103, so that the first electromagnetic shielding part can be separated from the rear housing 1041, and the electromagnetic shielding tape is not attached to the backlight module 102, thereby avoiding contact between the first electromagnetic shielding part and the housing assembly and the backlight module 102, and reducing electromagnetic interference conducted through contact.

In some embodiments, returning to fig. 1B, the circuit board 103 includes at least two first electromagnetic shielding portions 1031, and the electromagnetic shielding tape covers all the first electromagnetic shielding portions 1031 included on the circuit board 103, so as to greatly reduce contact between components inside the display device and avoid electromagnetic crosstalk.

In some embodiments, the orthographic projection of the electromagnetic shielding tape on the rear housing is located in the orthographic projection of the circuit board 103 on the rear housing or overlaps with the orthographic projection of the circuit board 103 on the rear housing. When the electromagnetic shielding tape is attached, it may cover only all of the first electromagnetic shielding portion included on the first surface of the circuit board 103, or may cover all of the area of the first surface of the circuit board 103.

It should be noted that, for the first electromagnetic shielding portion, the orthographic projection of the electromagnetic shielding tape on the rear housing is located in the orthographic projection of the circuit board 103 on the rear housing, and at this time, the electromagnetic shielding tape only covers all the first electromagnetic shielding portions included on the first surface of the circuit board 103, so as to avoid the first electromagnetic shielding portion contacting with the housing assembly and the backlight module 102, and avoid electromagnetic crosstalk caused by contact conduction electromagnetic interference. Or, the orthographic projection of the electromagnetic shielding tape on the rear shell overlaps with the orthographic projection of the circuit board 103 on the rear shell, and at this time, the electromagnetic shielding tape completely covers the first surface of the circuit board 103, so as to avoid the first electromagnetic shielding part from contacting with the housing assembly and the backlight module 102, thereby achieving the effect of avoiding electromagnetic crosstalk caused by contact conduction electromagnetic interference.

In some embodiments, the display device 100 may be a vehicle-mounted display device, and since the vehicle-mounted display device is generally close to a user and is more easily interfered by various electronic products carried by the user, the application of the display device 100 of the embodiments of the present disclosure to the vehicle-mounted display device can improve the user experience of the automobile user.

Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present disclosure, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in details for the sake of brevity.

Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present disclosure. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present disclosure, and this also accounts for the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform on which the embodiments of the present disclosure are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.

Claims

1. The utility model provides a display device, its characterized in that includes display panel, backlight unit and is used for driving the display panel with the circuit board of backlight unit, wherein, the circuit board includes:

2. The display device according to claim 1, wherein the filter circuit is configured to:

3. The display device according to claim 1, wherein the second surface of the circuit board faces the backlight module, and the second electromagnetic shielding portion is in contact with the backlight module.

4. The display device according to claim 1, wherein the first electromagnetic shield portion includes a conductive region provided at the first face of the circuit board; and/or the second electromagnetic shielding part comprises a conductive area arranged on the second surface of the circuit board.

5. The display device of claim 1, wherein the filter circuit comprises a first resistor and a first capacitor, the first resistor and a first end of the first capacitor being electrically coupled to the first electromagnetic shield, the first resistor and a second end of the first capacitor being electrically coupled to the second electromagnetic shield.

6. The display device according to claim 1, wherein the filter circuit comprises a second resistor, one end of the second resistor is electrically coupled to the first electromagnetic shielding portion, and the other end of the second resistor is electrically coupled to the second electromagnetic shielding portion, wherein a resistance value of the second resistor is 10 ⁵ Ohmic; and/or

7. The display device according to claim 1, wherein the filter circuit includes a magnetic bead device, one end of the magnetic bead device is electrically coupled to the first electromagnetic shielding portion, and the other end of the magnetic bead unit is electrically coupled to the second electromagnetic shielding portion.

8. The display device of claim 1, further comprising an electromagnetic shielding tape and housing assembly;

the shell component is fixedly connected with the backlight module;

9. The display device according to claim 8, wherein the circuit board includes at least two of the first electromagnetic shielding portions, the first electromagnetic shielding portions are electrically insulated from each other, and the electromagnetic shielding tape covers the at least two of the first electromagnetic shielding portions.

10. The display device of claim 8, wherein the orthographic projection of the electromagnetic shielding tape on the rear housing is located in or overlaps with the orthographic projection of the circuit board on the rear housing.

11. The display device of claim 1, wherein at least one side edge of the first electromagnetic shield is flush with a same side edge of the first face of the circuit board; and/or at least one side edge of the second electromagnetic shield is flush with the same side edge of the second face of the circuit board.