Display device control unit and display device

Description

TECHNICAL FIELD

[0001] The present invention relates to a control unit of a display device and a display device comprising the control unit.BACKGROUND

[0002] A plurality of circuit structures are arranged in a control unit of display device. In order to prevent interference of electric field and electromagnetic wave being generated between different circuit structures, the circuit structures are generally shielded to prevent it from being influenced by the outside environment. In the prior art, the electric field is generally shielded by a metal casing, but in this way, the heat generated by the circuit structures cannot be dissipated well while the electric field is completely shielded, therefore reducing the heat dissipating effect of the control unit and shortening the lifetime of the control unit.

[0003] [0002.1] JP 2003 173147 A discloses a heat radiation structure for a display device, the display device comprising a display panel, a frame chassis to fix and support the display panel from the rear face in a first principal surface, a plurality of reinforcing ribs to reinforce the frame chassis, and circuit boards; the reinforcing ribs are vertically arranged so as to take a sideway attitude toward the second principal surface of the frame chassis; the circuit boards are mounted between upper and lower reinforcing ribs in the second principal surface with a gap from the frame chassis; spaces for introducing cooling air to the gap are provided between the circuit boards and the reinforcing rib positioned at the lower part; spaces for discharging the cooling air from the gap are provided between the circuit boards and the reinforcing rib positioned at the upper part.

[0004] [0002.2] US 2008 / 0212270 A1 discloses a coupling structure including a chassis base configured to support a display panel, and an electromagnetic wave shielding member connected to the chassis base so as to form an area for installing a circuit board. The electromagnetic wave shielding member may surround the circuit board.

[0005] [0002.3] US 2009 / 0147175 A1 discloses a liquid crystal display apparatus. A circuit board mounting surface at the back of the liquid crystal monitor unit is divided into a plurality of board mount areas using the vertically extending reinforcement members. A signal circuit board section and timing control circuit board section are disposed in the same board mount area which is different from the partition where the power supply circuit board section resides.

[0006] [0002.4] US 2017 / 0006697 A1 discloses a heatsink to be mounted on a circuit board including a plurality of electronic parts is constituted of a conductive and rectangular plate-shaped member, and mounted on the circuit board such that a main surface of the heatsink blocks an airflow generated on the circuit board, the heatsink being electrically grounded. The main surface includes a contacting portion disposed in contact with the circuit board and an isolated portion separated from the circuit board, the isolated portion being cut into two parts along a straight line extending in a direction away from the circuit board. The two parts are each bent such that an end portion on a side of the straight line is oriented to a downstream side of the airflow, so that an opening is defined between the respective end portions of the two parts on the side of the straight line.

[0007] [0002.5] US 2009 / 0188703 A1 discloses a multilayer wiring board including a multilayer wiring substrate having a concave portion which accommodates an electronic component. The multilayer wiring substrate has multiple insulation layers, multiple conductive circuits, multiple vias and an electromagnetic shielding layer. The conductive circuits are separated by the insulation layers and electrically connected through the vias. The electromagnetic shielding layer has a roughened surface and formed along one of a bottom surface and side surfaces of the concave portion in the multilayer wiring substrate.

[0008] [0002.6] US 2016 / 0302301 A1 discloses a printed circuit board and a method of manufacturing a printed circuit board; the printed circuit board includes a base, a wiring structure disposed on at least one of a surface and an interior of the base, and a plurality of stitching vias penetrating through the base in a thickness direction along an edge of the base and having side surfaces exposed externally.

[0009] [0002.7] US 2017 / 0034903 A1 discloses an electronic module having an electromagnetic shielding structure and its manufacturing method. At first, a first substrate and a second substrate are separately provided. At least one electronic element and at least one connection pad are formed on a surface of the first substrate. The second substrate includes a conductive film and at least one conductive bump is formed on a surface of the conductive film. The first substrate and the second substrate are laminated together wherein the conductive bump is aligned with and connected to the connection pad to obtain the electronic module.

[0010] [0002.8] US2014048914A1 discloses a wiring board with embedded device and electromagnetic shielding, the wiring board includes a shielding frame, a semiconductor device, a stiffener, a first build-up circuitry and a second build-up circuitry with a shielding lid. The first and second build-up circuitries cover the semiconductor device, the shielding frame and the stiffener in the opposite vertical directions. The shielding frame and the shielding lid are electrically connected to at least one ground contact pad of the semiconductor device by the first build-up circuitry and can respectively serve as effective horizontal and vertical electromagnetic shields for the semiconductor devices within the aperture of the stiffener.

[0011] [0002.9] US2016295713A1 discloses a display device having a compact structure, the display device includes a main board and an inverter board of the display device connected to each other. A bracket supports the main board and the inverter board. The bracket includes a shielding part to block electromagnetic waves, an inverter board holding part to allow the inverter board to be easily seated on the bracket, and a support and fixing part to support and fix the bracket. Further, a front cover and a back cover are connected in a snap-fit manner, and a bottom chassis includes a cable receipt groove to organize the internal wiring of the display device.SUMMARY

[0012] It is an object of the present invention to provide a control unit of a display device and a display device comprising the control unit, which can solve at least one of the technical problems existing in the prior art and can improve the heat dissipating effect without affecting the shielding effect of the electric field.

[0013] The object is achieved by the features of independent claim 1. Further embodiments are defined in the corresponding dependent claims.BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described in the following; the described drawings are only related to some embodiments of the invention which is only defined in the claims. Fig. 1 is a partial perspective view of a control unit of display device in an embodiment of the present invention; Fig. 2 is a top view of a circuit structure and an electric field shielding structure in a first structure in a control unit of display device in an embodiment of the present invention; Fig. 3 is a positional relationship schematic diagram of a circuit structure and a first shielding structure on one side of the circuit structure; Fig. 4 is a top view of a circuit structure and an electric field shielding structure in a second structure in a control unit of display device in an embodiment of the present invention; Fig. 5 is a sectional view taken along a line A-A' of Fig. 4; and Fig. 6 is a schematic diagram of two adjacent circuit structures and a shielding strip between the two adjacent circuit structures.

[0015] Wherein the reference numbers are: 10 - first shielding structure; 11 - first shielding strip; 20 - second shielding structure; 21 - second shielding strip; 30 - back plate; 40 - circuit structure; 41 - circuit board; 42 - electronic component; 43 - signal terminal; 44 - signal line; 45 - electric field shielding casing .DETAILED DESCRIPTION

[0016] Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms "first," "second," etc., which are used in the description and the claims of the present application for disclosure, are not intended to indicate any sequence, amount or importance, but distinguish various components. Also, the terms such as "a," "an," etc., are not intended to limit the amount, but indicate the existence of at least one. The terms "comprise," "comprising," "include," "including," etc., are intended to specify that the elements or the objects stated before these terms encompass the elements or the objects and equivalents thereof listed after these terms, but do not preclude the other elements or objects. The phrases "connect", "connected", etc., are not intended to define a physical connection or mechanical connection, but may include an electrical connection, directly or indirectly. "On," "under," "right," "left" and the like are only used to indicate relative position relationship, and when the position of the object which is described is changed, the relative position relationship may be changed accordingly.

[0017] In an aspect of the present disclosure, a control unit of display device is provided, the control unit of display device comprises: a back plate; a plurality of circuit structures, the plurality of circuit structures are arranged on the back plate; a plurality of electric field shielding structures, each of the electric field shielding structures being arranged between the circuit structures and configured to shield an electric field between the circuit structures, wherein each of the electric field shielding structures comprises a plurality of shielding strips, the plurality of shielding strips are spaced apart from each other and projections of the shielding strips on a corresponding side of the circuit structures are continuous and uninterrupted.

[0018] An exemplary description is given below with reference to Fig. 1 to Fig. 4. the control unit of display device comprises a back plate 30, a plurality of circuit structures 40 and an electric field shielding structure that is used for shielding an electric field for each of the circuit structures 40 are arranged on the back plate 30; the electric field shielding structure comprises a plurality of shielding strips that surrounds the circuit structure 40. The plurality of shielding strips comprise a plurality of first shielding strips 11 that are arranged on two opposite sides of the circuit structure 40 and a plurality of second shielding strips 21 that are arranged on other two sides of the circuit structure 40; the first shielding strips 11 that are arranged on the same side of the circuit structure 40 constitute a first shielding structure 10, the second shielding strips 21 that are arranged on the same side of the circuit structure 40 constitute a second shielding structure 20, two first shielding structures 10 are arranged in a predetermined heat dissipating direction of the circuit structure 40. The first shielding structure 10 comprises at least two first shielding strips 11 that are spaced apart from each other, a size of each of the first shielding strips in an arrangement direction of the two second shielding structures 20 is smaller than a size of the circuit structure 40 in the arrangement direction of the two second shielding structures 20, and a projection of the first shielding structure 10 on a corresponding side of the circuit structure 40 is continuous and uninterrupted.

[0019] It should be noted that the projection being continuous and uninterrupted means that there is no gap between any adjacent projections of the projections of all the shielding strips in the shielding structure. For example, the projection edges between the adjacent shielding strips are seamlessly connected or the projections overlap with each other.

[0020] The control unit of display device is particularly suitable for a vertical display device. The heat generated during the operation of the circuit structure 40 mainly dissipates in a vertical direction, therefore the predetermined heat dissipating direction refers to an up-down direction when the control unit of display device is used in the vertical display device. In the present disclosure, the predetermined heat dissipating direction is the up-down direction in Fig. 2 and Fig. 4.

[0021] In Fig. 2 and Fig. 4, the two second shielding structures 20 are arranged in a left-right direction. Therefore, the size of the first shielding strip 11 in the arrangement direction of the two second shielding structures 20 is a length of a projection of the first shielding strip 11 on the circuit structure 40 in the left-right direction.

[0022] In the present disclosure, the two first shielding structures 10 are arranged in the predetermined heat dissipating direction (namely a main direction of the heat dissipation), the first shielding strips 11 of the first shielding structure 10 are spaced apart from each other, and the size of the first shielding strip 11 in the arrangement direction of the two second shielding structures 20 is smaller than the size of the circuit structure 40 in the arrangement direction of the two second shielding structures 20, therefore when most of the heat generated by the circuit structure 40 dissipates in the predetermined heat dissipating direction, the heat can dissipate outwardly via an interval between the two adjacent first shielding strips 11 to improve the heat dissipating effect. Moreover, the projection of the first shielding structure 10 on the corresponding side of the circuit structure 40 is continuous and uninterrupted, and an electromagnetic wave propagates in a straight line direction, therefore an interval between the first shielding strips 11 does not affect the shielding effect of the electric field, so as to improve the heat dissipating effect of the control unit of display device without affecting the electric field shielding effect and prolong the service life of the control unit of the display device.

[0023] Herein in order to improve the shielding effect, the size of the first shielding structure 10 in the arrangement direction of the two second shielding structures 20 is not smaller than the size of the circuit structure 40 in the arrangement direction of the two second shielding structures 20; and / or, a size of the second shielding structure 20 in the predetermined heat dissipating direction is not smaller than a size of the circuit structure 40 in the predetermined heat dissipating direction.

[0024] In the present disclosure, in order to realize that the projection of the first shielding structure 10 on the circuit structure 40 is continuous and uninterrupted, the projections of every two adjacent first shielding strips 11 on the circuit structure 40 may partially overlap with each other or only contact but not overlap with each other. In order to further facilitate the heat to dissipate outwardly, for example, as illustrated in Fig. 2 and Fig. 4, in the same first shielding structure 10, the projections of every two adjacent first shielding strips 11 on the corresponding side of the circuit structure 40 are in contact with each other and without any overlap, that is, two ends of two adjacent first shielding strips 11 that are close to each other are flush in the predetermined heat dissipating direction.

[0025] It should be noted that "two adjacent first shielding strips 11" in the present disclosure means that a distance between the two first shielding strips 11 in the arrangement direction of the two second shielding structures 20 are the smallest. For example, an arrangement of the first shielding strips 11 in one of the first shielding structures 10 is illustrated in Fig. 3, the two second shielding structures (not illustrated in Fig. 3) are still arranged in the left-right direction. In this situation, the first shielding strip 11 that is adjacent to a leftmost first shielding strip 11 is a middle first shielding strip 11 instead of a rightmost shielding strip 11.

[0026] In the present disclosure, an extending direction of the first shielding strip 11 is not particularly limited. For example, the extending direction of the first shielding strip 11 may be perpendicular to the predetermined heat dissipating direction (as illustrated in Fig. 1) or may intersect with but not be perpendicular to the predetermined heat dissipating direction. For example, as illustrated in Fig. 2 and Fig. 4, an angle between the extending direction of at least one of the first shielding strips 11 and the predetermined heat dissipating direction ranges from 45 ° to 90 °. Further, for example, an angle between the extending direction of each of the first shielding strips 11 and the predetermined heat dissipating direction ranges from 45 ° to 90 °. Compared with the arrangement in Fig. 1 (that is, the extending direction of each of the first shielding strips 11 is perpendicular to the predetermined heat dissipating direction), the angle between the extending direction of the first shielding strip 11 and the predetermined heat dissipating direction being set to range from 45 ° to 90 ° are more favorable to dissipate heat.

[0027] Structures of the circuit structure 40 and the second shielding structure 20 are described below with reference to Fig. 1 to Fig. 4. The circuit structure 40 comprises a circuit board 41 that is arranged on the back plate 30 and an electronic component 42 that is arranged on the circuit board 41, a signal terminal 43 is arranged on an edge of the circuit board 41 that is close to at least one second shield structure 20. The signal terminal 43 is used to connect with other circuit structures 40 or a signal terminal through a signal line 44.

[0028] The second shielding structure 20 (the second shielding structure 20 on a right side of the circuit structure 40 in Fig. 2 and Fig. 4) corresponding to the edge where the signal terminal 43 is arranged comprises at least two second shielding strips 21 that are spaced apart from each other, projections of the second shielding strips 21 on the corresponding side of the circuit structure 40 is discrete at a position of the signal terminal 43, and the electric field shielding structure further comprises an electric field shielding casing 45 (as illustrated in Fig. 5) that is enveloped outside the signal terminal 43. Therefore, the signal line 44 may be led out from the interval between the second shielding strips 21 on the right side, and the electric field shielding casing 45 that is enveloped outside the signal terminal 43 can prevent electric field interference that is caused by the interval between the second shielding strips 21 on the right side. In order to facilitate every signal line 44 to being lead out, the number of the intervals that are formed by the projections of the second shielding structures 20 corresponding to the edge where the signal terminal 43 is arranged on the circuit structure 40 may be the same as the number of the signal terminals 43. For example, in Fig. 2 and Fig. 4, two signal terminals 43 are arranged on an edge of the circuit board 41 facing the right second shield structure 20. In this situation, the second shield structure 20 may comprise three second shield strips 21 that are spaced apart from each other. The interval between every two adjacent second shielding strips 21 corresponds to one signal terminal 43. Herein a height of the electric field shielding casing 45 may be greater than a height of the electronic component 42 on the circuit board 41 to improve the shielding effect.

[0029] Further, the signal terminal 43 is arranged on an edge of a circuit board 41 that is close to one of the second shield structures 20 (the right second shield structure 20 in Fig. 2 and Fig. 4), and at an edge of the circuit board 41 that is close to another second shield structure 20 (the left second shield structure 20 in Fig. 2 and Fig. 4), no signal terminal 43 is arranged. In this situation, in the another second shielding structure 20 (the left second shielding structure 20 in Fig. 2 and Fig. 4), the number of the second shielding strips 21 is at least two and the two second shielding strips 21 are spaced from each other, the size of the second shielding strip 21 in the predetermined heat dissipating direction is smaller than the size of the circuit structure 40 in the predetermined heat dissipating direction and the projection of the second shielding structure 20 on the corresponding side of the circuit structure 40 is uninterrupted. Therefore, when the heat of the circuit structure 40 dissipates in the left-right direction, the heat can also dissipate out from an interval between the left second shielding strips 21 to further improve the heat dissipating effect. There is an interval between two adjacent second shielding strips 21 on the left side, but there is no interval between projections of the two adjacent second shielding strips 21 on the circuit structure 40. Therefore, the interval between the second shielding strips 21 can further improve the heat dissipation without affecting the shielding of the electric field.

[0030] Herein in the left second shield structure 20, projections of two adjacent second shield strips 21 on the circuit structure 40 may not overlap with each other or may partially overlap with each other. In each of the second shielding structures 20, each of the second shielding strips 21 may extend in the predetermined heat dissipating direction.

[0031] Material and structure of the shielding strip in the present disclosure may be set as follows: A first manner is: the first shielding strip 11 and / or the second shielding strip 21 are metal strips that are formed integrally with the back plate 30. A second manner is: the first shielding strip 11 and / or the second shielding strip 21 respectively comprise a filling block and a conductive layer enveloping the filling block. The filling block may be in a foam-like or a sponge-like structure, and the conductive layer may be a conductive adhesive tape.

[0032] That is, both the first shielding strip 11 and the second shielding strip 21 may be metal strips that are formed integrally with the back plate 30; alternatively, both the first shielding strip 11 and the second shielding strip 21 may respectively comprise a filling block and a conductive layer enveloping the filling block. Alternatively, one of the first shielding strip 11 and the second shielding strips 21 is a metal strip that is formed integrally with the back plate 30, the other one comprises a filling block and a conductive layer enveloping the filling block.

[0033] In order to ensure that the shielding strip between the two adjacent circuit structures 40 can shield the electric field, a height of the shielding strip cannot be toosmall. The height of the shielding strip between the two circuit structures 40 should not be less than a maximum height of an electronic component 42 on the circuit structure 40 with a relative small height, a height of an electronic component 42 is a distance between a top of the electronic component 42 and an upper surface of the back plate 30 at a corresponding position to the electronic component. Further, as illustrated in Fig. 6, in any two adjacent circuit structures 40 when a height of a first circuit structure 40 is less than a height of a second circuit structure 40 (the height of a circuit structure 40 is a height of an electronic component with a highest height in the circuit structure 40), a height of a shielding strip between the two circuit structures 40 is H2, the height H2 is a distance between a top of the shielding strip and an upper surface of the back plate 30 at a corresponding position to the shielding strip; H2 satisfies: H 2 ≥ H 3 * L 1 + H 1 L − L 1 / L ;

[0034] In the above formula, H1 is a height of a first reference electronic component in the first circuit structure 40 (namely the circuit structure 40 at a left side in Fig.6), the height is a distance between a top of the first reference electronic component and an upper surface of the back plate 30 at a position corresponding to the first reference electronic component; H3 is a height of a second reference electronic component in the second circuit structure 40 (namely the right circuit structure 40 in the Fig.6), the height is a distance between a top of the second reference electronic component and an upper surface of the back plate 30 at a corresponding position to the second reference electronic component; L1 is a distance between a side of the first reference electronic component that is farthest from the shielding strip between the two circuit structures 40 and a side of the shielding strip between the two circuit structures 40 that is closest to the first reference electronic element; L is a distance between a side of the first reference electronic component that is farthest from the second reference electronic component and a side of the second reference electronic component that is farthest from the first reference electronic component. Wherein the second reference electronic component is an electronic component 42 with a highest height in the second circuit structure 40; the first reference electronic component is an electronic component 42 with a smallest angle between a connection line of a top of the electronic component 42 in the first circuit structure 40 and a top of the second reference electronic component and the back plate 30. In Fig. 6, the shielding strip between the two circuit structures 40 is shown as the second shielding strip 21 to illustrate. Of course, the shielding strip between the two circuit structures 40 may also be the first shielding strip 11.

[0035] Above is a description of the control unit of display device provided by the present disclosure. It can be seen that in the electric field shielding structure that is used for shielding the circuit structure 40, the first shielding strips 11 of the first shielding structure 10 are spaced apart from each other, and the size of the first the shielding strip 11 in the arrangement direction of the two second shielding structures 20 is smaller than the size of the circuit structure 40 in the arrangement direction of the two second shielding structures 20, therefore when most of the heat that is generated by the circuit structure 40 dissipates in a predetermined heat dissipating direction, the heat can dissipate outwardly via the interval between the two adjacent first shielding strips 11 to improve the heat dissipating effect. Moreover, the electromagnetic wave propagates in a straight line direction, the projection of the first shielding structure 10 on the corresponding side of the circuit structure 40 is continuous and uninterrupted, therefore the interval between the first shielding strips 11 does not affect the shielding effect of the electric field so as to improve the heat dissipating effect of the control unit of the display device without affecting the shielding effect of the electric field. In addition, the second shielding structure 20 comprises at least two second shielding strips 21 that are spaced apart from each other, the signal terminal 43 on the circuit board 41 is enveloped by the electric field shielding casing 45, and therefore the signal interference caused by the interval between the second shielding strips 21 can be avoided. The projection of the second shielding structure 20 corresponding to the edge where the signal terminal 43 is not arranged on the circuit structure 40 is continuous so as to further improve the heat dissipating effect without affecting the shielding effect of the electric field.

[0036] As a second aspect of the present disclosure, a display device is provided, the display device comprises the above control unit of the display device. Wherein the display device may be a vertical display device. In the electric field shielding structure of the control unit of display device in the present disclosure, the interval between the shielding strips does not affect the shielding effect of the electric field while increases the heat dissipating effect, and therefore prolongs the lifetime of the control unit of display device, and the display device adopting the control unit of display device can achieve better heat dissipation and better quality.

[0037] The present disclosure provides a control unit of display device and a display device. The two first shielding structures are arranged in the predetermined heat dissipation direction, the first shielding strips of the first shielding structure are spaced apart from each other, and the size of the first shielding strip in the arrangement direction of the two second shielding structures is smaller than the size of the circuit structure in the arrangement direction of the two second shielding structures, so that when most of the heat that is generated by the circuit structure dissipates in the predetermined heat dissipating direction, the heat can dissipate outwardly via the interval between the two adjacent first shielding strips to improve the heat dissipating effect. Moreover, the projection of the first shielding structure on the circuit structure is continuous and uninterrupted, and the electromagnetic wave propagates in a straight line direction, therefore the interval between the first shielding strips does not affect the shielding effect of the electric field so as to improve the heat dissipating effect of the control unit of display device without affecting the shielding effect of the electric field, and therefore prolong the lifetime of the control unit of display device and the lifetime of a display panel adopting the control unit of display device.

Claims

1. A control unit of display device, comprising: a back plate (30), a plurality of circuit structures (40), the plurality of circuit structures (40) being arranged on the back plate (30), a plurality of electric field shielding structures (10, 20), each of the plurality of electric field shielding structures (10,20) being arranged between the circuit structures (40) and configured to shield an electric field between the circuit structures (40), wherein each of the plurality of circuit structures (40) comprises a circuit board (41) that is arranged on the back plate (30) and an electronic component (42) that is arranged on the circuit board (41), characterized in that each of the plurality of electric field shielding structures (10, 20) comprises a plurality of shielding strips (11, 21), the plurality of shielding strips(11, 21) are spaced apart from each other and projections of the plurality of shielding strips (11, 21) on a corresponding side of the circuit structure (40) are continuous and uninterrupted.

2. The control unit of display device according to claim 1, wherein, the circuit structure (40) is in a shape of rectangular, the plurality of electric field shielding structures (10, 20) comprise first shielding structures (10) and second shielding structures (20), the first shielding structures (10) are arranged on two opposite sides of the circuit structure (40), and the second shielding structures (20) are arranged on other two sides of the circuit structure (40); each of the first shielding structure (10) comprises at least two first shielding strips (11) that are spaced apart from each other, a size of each of the first shielding strips (11) in an arrangement direction of the second shielding structures (20) is smaller than a size of the circuit structure (40) in the arrangement direction of the second shielding structures (20), and a projection of each of the first shielding structures (10) on a corresponding side of the circuit structure (40) is continuous and uninterrupted.

3. The control unit of display device according to claim 2, wherein in one of the first shielding structures (10) which is located at an identical side of the circuit structure (40), projections of every two adjacent shielding strips (11) on the corresponding side of the circuit structure (40) are in contact with each other and without any overlap.

4. The control unit of display device according to claim 2, wherein an angle between an extending direction of at least one of the first shielding strips (11) and a predetermined heat dissipating direction ranges from 45 ° to 90 °.

5. The control unit of display device according to claim 4, wherein an angle between the extending direction of each of the first shielding strips (11) and the predetermined heat dissipating direction ranges from 45 ° to 90 °.

6. The control unit of display device according to claim 2, wherein a size of the first shielding structure (10) in the arrangement direction of the second shielding structures (20) is not smaller than the size of the circuit structure (40) in the arrangement direction of the second shielding structures (20); or a size of the second shielding structure (20) in a predetermined heat dissipating direction is not smaller than a size of the circuit structure (40) in the predetermined heat dissipating direction.

7. The control unit of display device according to claim 2, wherein a size of the first shielding structure (10) in the arrangement direction of the second shielding structures (20) is not smaller than the size of the circuit structure (40) in the arrangement direction of the second shielding structures (20); and a size of the second shielding structure (20) in a predetermined heat dissipating direction is not smaller than a size of the circuit structure (40) in the predetermined heat dissipating direction.

8. The control unit of display device according to any one of claims 2-7, wherein a signal terminal (43) is arranged on an edge of the circuit board (41) that is close to at least one of the second shielding structures (20); the second shielding structure (20) corresponding to the edge where the signal terminal (43) is arranged comprises at least two second shielding strips (21) that are spaced apart from each other and a projection of the second shielding structure (20) on a corresponding side of the circuit structure (40) is discrete at a position of the signal terminal, and the electric field shielding structure (10, 20) further comprises an electric field shielding casing (45) that is enveloped outside the signal terminal (43).

9. The control unit of display device according to claim 8, wherein the signal terminal (43) is arranged on an edge of the circuit board (41) that is close to one of the second shielding structures (20); in another one of the second shielding structures (20), a number of the second shielding strips (21) is at least two and the second shielding strips (21) are spaced apart from each other, a size of the second shielding strip (21) in the predetermined heat dissipating direction is smaller than a size of the circuit structure (40) in the predetermined heat dissipating direction, and the projection of the second shielding structure (20) on the circuit structure (40) is continuous and uninterrupted.

10. The control unit of display device according to any one of claims 2-7, wherein the second shielding strip (21) extends along the predetermined heat dissipating direction.

11. The control unit of display device according to any one of claims 2-7, wherein the first shielding strip (11) and the second shielding strip (21) are metal strips that are formed integrally with the back plate (30); or, the first shielding strip (11) or the second shielding strip (21) is a metal strip that is formed integrally with the back plate (30).

12. The control unit of display device according to any one of claims 2-7, wherein the first shielding strip (11) comprises a filling block and a conductive layer enveloping the filling block; and / or, the second shielding strip (21) comprises a filling block and a conductive layer enveloping the filling block.

13. The control unit of display device according to any one of claims 2-7, wherein the circuit structure (40) comprises a signal terminal (43)that is arranged on the circuit board (41), in any two adjacent circuit structures (40), under a condition that a height of a first circuit structure (40) is less than a height of a second circuit structure (40), a height of a shielding strip between the first circuit structure (40) and the second circuit structure (40) is not less than (H3 * L1 + H1 (L-L1)) / L; wherein H1 is a height of a first reference electronic component in the first circuit structure (40); H3 is a height of a second reference electronic component in the second circuit structure (40); L1 is a distance between a side of the first reference electronic component that is farthest from the shielding strip between the first circuit structure (40) and the second circuit structure (40) and a side of the shielding strip between the first circuit structure (40) and the second circuit structure (40) that is closest to the first reference electronic element; L is a distance between a side of the first reference electronic component that is farthest from the second reference electronic component and a side of the second reference electronic component that is farthest from the first reference electronic component; the second reference electronic component is an electronic component with a highest height in the second circuit structure (40); the first reference electronic component is an electronic component with a smallest angle between a connection line of a top of the electronic component in the first circuit structure (40) and a top of the second reference electronic component and the back plate (30); the height of the shielding strip is a distance between a top of the shielding strip and an upper surface of the back plate (30) at a corresponding position to the shielding strip; the height of the electronic component is a distance between a top of the electronic component and an upper surface of the back plate (30) at a corresponding position to the electronic component; and the height of the circuit structure (40) is a height of an electronic component with a highest height in the circuit structure (40).

14. The control unit of display device according to any one of claims 2-7, wherein in one of the first shielding structures (10) which is located at an identical side of the circuit structure (40), projections of every two adjacent first shielding strips (11) on the corresponding side of the circuit structure (40) overlap with each other.

15. A display device, comprising the control unit of display device according to any one of claims 1-14.