CN105873342B - Display device - Google Patents

Abstract

A display device includes a display panel, a circuit board and a conductive element. The circuit board is adjacent to the display panel and electrically connected to the display panel. The circuit board has at least one conductive pattern configured in a grounding area. The conductive pattern includes a plurality of conductive parts arranged at intervals. The number of these conductive parts along a first direction and a second direction is respectively a plurality, and the first direction is substantially perpendicular to the second direction. The conductive element is arranged on the conductive pattern, and the conductive element is electrically connected to these conductive parts. The present invention can not only reduce the grounding impedance between the conductive element and the grounding area, but also improve the side thrust stress resistance of the conductive element. Therefore, problems such as poor contact or falling off of the conductive element can be avoided, thereby improving the electromagnetic interference and electrostatic discharge protection capabilities of the display device.

Description

display device

technical field

The present invention relates to a display device, in particular to a flat display device.

Background technique

With the advancement of technology, flat-panel display devices have been widely used in various fields, especially liquid crystal display devices or organic light-emitting diode display devices, which have gradually replaced Traditional cathode ray tube display devices are applied to many types of electronic products, such as mobile phones, portable multimedia devices, notebook computers or televisions, and so on.

In addition, due to the increasingly powerful functions of modern electronic products, faster and faster operation speeds, and increasingly dense and complex electronic circuits, the problems of Electro Magnetic Interference (EMI) or Electro Static Discharge (ESD) becomes another one of the major challenges in circuit design. Therefore, how to strengthen the protection of electronic circuits against EMI interference and electrostatic discharge is also one of the goals that the industry has been striving for.

In the prior art, during the product development process of the flat panel display device, a paste-type conductive element (such as conductive foam) is generally arranged on the control circuit board, so that the components on the circuit board can be directly connected to the control circuit board through the conductive element. The metal shell contacts to increase the electromagnetic interference and electrostatic protection capabilities of the components. However, attaching the conductive elements to the circuit board by pasting not only increases the man-hours for pasting, but also easily causes problems such as poor contact of the conductive elements, or even falling off, resulting in a reduction in electromagnetic interference or electrostatic discharge protection.

Contents of the invention

The purpose of the present invention is to provide a display device, which can avoid problems such as poor contact or falling off of conductive elements, so as to improve the protection ability of electromagnetic interference and electrostatic discharge.

The technical solution of the present invention is to provide a display device including a display panel, a circuit board and a conductive element. The circuit board is adjacent to the display panel and is electrically connected to the display panel. The circuit board has at least one conductive pattern arranged in a grounding area. The conductive pattern includes a plurality of conductive parts arranged at intervals. These conductive parts are arranged along a first direction and a first direction. The quantity of the two directions is multiple respectively, and the first direction is substantially perpendicular to the second direction. The conductive element is disposed on the conductive pattern, and the conductive element is electrically connected to these conductive parts.

In one embodiment, the conductive parts are arranged in a two-dimensional matrix.

In one embodiment, at least some of the conductive parts are directly connected to the conductive elements by welding.

In one embodiment, the conductive element has an elastic body and a metal layer, and the metal layer is disposed on the outer surface of the elastic body.

In one embodiment, the conductive element has a first surface, the first surface is in contact with the conductive pattern, and the sum of the lengths of these conductive parts along the first direction is between 0.5 and 0.85 times the length of the first surface along the first direction .

In one embodiment, there is a distance between two adjacent conductive parts arranged along the first direction, and the distance is greater than 0.5 mm and less than 1.2 mm.

In one embodiment, at least one of the conductive portions has a portion exposed outside the conductive element along the first direction.

In an embodiment, the conductive parts are completely covered by the conductive elements along the second direction.

In one embodiment, the display device further includes a metal part, the conductive element has a first surface and a second surface opposite to the first surface, the first surface contacts the conductive parts, and the second surface directly contacts the metal part.

In one embodiment, the metal part is a casing or a back plate of the display device.

As mentioned above, in the display device of the present invention, the number of these conductive parts arranged at intervals in the grounding area of the circuit board along the first direction and the second direction is respectively multiple, and the conductive elements are arranged on the conductive pattern , and electrically connect these conductive parts, therefore, compared with the prior art, not only the grounding impedance between the conductive element and the grounding area can be reduced, but also the strength of the conductive element against lateral thrust can be improved, so that poor contact of the conductive element can be avoided Or falling off and other problems, thereby improving the protection ability of the display device from electromagnetic interference and electrostatic discharge.

Description of drawings

FIG. 1 is a schematic diagram of a display device according to a preferred embodiment of the present invention.

FIG. 2A is a schematic diagram of the connection between the circuit board and the conductive elements of the display device in FIG. 1 .

FIG. 2B is a schematic top view of the conductive pattern of the circuit board of FIG. 2A .

FIG. 2C is a schematic diagram of connection of a circuit board, a conductive element and a metal part in a display device.

FIG. 3A is a schematic diagram of connection between a circuit board and a conductive element in another embodiment.

FIG. 3B is a schematic top view of the conductive pattern of the circuit board of FIG. 3A .

detailed description

A display device according to a preferred embodiment of the present invention will be described below with reference to related drawings, wherein the same elements will be described with the same reference symbols.

Please refer to FIGS. 1 to 2C, wherein FIG. 1 is a schematic diagram of a display device 1 according to a preferred embodiment of the present invention, and FIG. 2A is a schematic diagram of the connection between the circuit board 12 and the conductive element 13 of the display device 1 of FIG. 1 2B is a schematic top view of the conductive pattern 121 of the circuit board 12 of FIG.

The display device 1 can be a liquid crystal display device or an organic light emitting diode display device, and is for example but not limited to a display screen, a tablet computer, a smart phone, a global positioning system (global positioning system) or a notebook computer, or a Electronic devices with touch screens are not limited.

The display device 1 includes a display panel 11 , a circuit board 12 and a conductive element 13 . Wherein, in order to clearly illustrate the features of the present invention, in the display device 1, the extending direction of the long side of the display panel 11 or the long side of the circuit board 12 is defined as a first direction D1, and the short side of the display panel 11 or the circuit board 12 The extending direction of the short side is defined as a second direction D2, and the second direction D2 is substantially perpendicular to the first direction D1.

The display panel 11 can be a liquid crystal display panel (LCD) or an organic light emitting diode (OLED) display panel, and the circuit board 12 is adjacent to the display panel 11 and electrically connected to the display panel 11 . Wherein, the circuit board 12 has control circuits or elements for driving and controlling the display panel 11 , and can be a printed circuit board, through which the operation of the display panel 11 can be driven and controlled (such as displaying images). The circuit board 12 of this embodiment is electrically connected to the display panel 11 through two connecting circuit boards 14 . Wherein, the connection circuit board 14 can be, for example, a flexible printed circuit board (flexible print circuit, FPC) or a chip on film (chip on film, COF), and is not limited thereto. In addition, this embodiment takes one circuit board 12 as an example. In different embodiments, the display device 1 may include multiple circuit boards 12 , and these circuit boards 12 are also electrically connected to the display panel 11 through the connection circuit board 14 . In addition, in different embodiments, the display device 1 may also include a control circuit board (not shown in the figure), the control circuit board is connected to the circuit board 12, and is electrically connected to the display panel 11 through the connection circuit board 14 for controlling The actions of the display panel 11 are not limited by the present invention.

The circuit board 12 has at least one conductive pattern 121 disposed on a grounding area 122 . The circuit board 12 in this embodiment is taken as an example with four conductive patterns 121 disposed on four grounding regions 122 . Herein, the so-called “ground area” refers to the area electrically connected to the ground terminal of the control element on the circuit board 12 ; Therefore, the object (conductive pattern 121 ) disposed in the grounding area can be directly grounded. The conductive pattern 121 may include a plurality of conductive parts 1211 arranged at intervals, and the numbers of the conductive parts 1211 along the first direction D1 and the second direction D2 are respectively multiple. Wherein, the shape of the conductive portion 1211 may be, for example, polygonal, circular or arc-shaped, or irregular. As shown in FIG. 2A , the number of the conductive parts 1211 in this embodiment is four, and the shape of the conductive parts 1211 is a quadrilateral as an example. Since the first direction D1 is substantially perpendicular to the second direction D2, the two conductive portions 1211 are arranged along the first direction D1, and the two conductive portions 1211 are arranged along the second direction D2, thereby forming a two-dimensional matrix. However, in different embodiments, the number of conductive parts 1211 may also be, for example, 6, 8, .

The conductive element 13 is disposed corresponding to the conductive pattern 121 and is disposed on the conductive pattern 121 . Here, the conductive element 13 itself has elasticity, so it has an elastic recovery force when it is stressed, so as to provide a buffer force; another "corresponding arrangement" means that the number of conductive patterns 121 is the same as the number of conductive elements 13, and one conductive The element 13 is disposed on a conductive pattern 121 to directly contact and electrically connect the conductive portions 1211 , so that the conductive element 13 and the conductive portions 1211 are also grounded. In addition, at least some of these conductive parts 1211 are directly connected to the conductive element 13 by welding. In this embodiment, the four conductive parts 1211 are all connected to the conductive element 13 by welding (that is, the two are connected by welding), so that these conductive parts 1211 are in contact with the conductive element 13 and electrically connected, in addition to adding conductive elements In addition to the connection strength between 13 and these conductive parts 1211, the contact resistance between them can also be reduced. The conductive element 13 of this embodiment can also be called a solderable conductive element 13 .

The cross-sectional shape of the conductive element 13 may be quadrilateral (trapezoid, square, rectangle), arc or ellipse, and is not limited. In addition, the conductive element 13 of this embodiment has an elastic body 131 and a metal layer 132. The metal layer 132 is disposed on the outer surface of the elastic body 131 to cover the outer periphery of the elastic body 131. Therefore, the metal layer 132 can directly contact These conductive parts 1211 are electrically connected. In addition, the elastic body 131 is a hollow elastic body, and can be made of insulating material (such as high molecular polymer, rubber or silica gel) or conductive material (such as high molecular polymer mixed with conductive particles), which is not limited. In addition, the material of the metal layer 132 can be, for example, a single-layer metal material or a multi-layer metal composite material of tin/copper/aluminum (aluminum can enhance stress resistance), and is not limited.

In addition, the conductive element 13 has a first surface S1 and a second surface S2, the first surface S1 contacts these conductive portions 1211, and the second surface S2 is opposite to the first surface S1. As shown in FIG. 2B , the length L of the first surface S1 of the conductive element 13 of the present embodiment along the first direction D1 is, for example, 5 mm, and the width W of the first surface S1 along the second direction D2 is, for example, 4 mm, and its height For example, it is 3mm (not marked). In addition, the sum of the lengths (L1+L2) of these conductive parts 1211 along the first direction D1 is between 0.5 times and 0.85 times the length L of the first surface S1 of the conductive element 13 along the first direction D1, and along the first direction There is a distance d1 between two adjacent conductive parts 1211 arranged in D1, and the distance d1 is greater than 0.5 millimeters. Among the conductive portions 1211 of the conductive pattern 121 of this embodiment, the length L1 along the first direction D1 is 1.5 mm, the length L2 is also 1.5 mm, and the length L is 5 mm, so (L1+L2)/L=0.6. In addition, the distance d1 between two adjacent conductive parts 1211 along the first direction D1 is 2.3mm, and 1.5+2.3+1.5=5.3>5, so at least one of these conductive parts 1211 has a part on the first direction D1 will be exposed outside the conductive element 13 . Here, the two conductive portions 1211 are partially exposed outside the first surface S1 of the conductive element 13 in the first direction D1 .

In addition, the widths W1 and W2 of these conductive parts 1211 along the second direction D2 in this embodiment are respectively 1.35 mm, and the distance d2 between two adjacent conductive parts 1211 along the second direction D2 is 1.0 mm (1.35+1.0+1.35 =3.7mm), and the width W of the conductive element 13 along the second direction D2 is 4mm (4>3.7), so these conductive parts 1211 are completely covered (not exposed) by the conductive element 13 in the second direction D2, thereby, The conductive element 13 has a higher connection strength when connected to the conductive parts 1211 , so it can withstand a higher lateral thrust in the second direction D2 without falling off.

In addition, as shown in FIG. 2C, the display device 1 can also include a metal piece 15, the metal piece 15 can be a housing or a backplane of the display device 1 (such as a component of a backlight module), and the metal piece 15 and the second The two surfaces S2 are in direct contact. Therefore, the grounding of the components on the circuit board 12 can be electrically connected to the metal piece 15 through the conductive element 13. Therefore, when there is electromagnetic interference and or electrostatic discharge on the circuit board 12, the electromagnetic interference and or electrostatic discharge can be passed through the conductive element 13. The electrostatic discharge charges are transferred to the metal part 15 of the display device 1 , thereby improving the protection capability of the circuit board 12 against electromagnetic interference or electrostatic discharge.

In addition, in the process of assembling or transporting the display device 1, the metal parts 15 mainly generate lateral thrust stress along the second direction D2 on the conductive elements 13, and the number of these conductive parts 1211 along the first direction D1 and the second direction D2 There are a plurality of conductive elements 13 connected to these conductive parts 1211 by welding, which not only can electrically connect the conductive pattern 121 to the conductive elements 13 to reduce the grounding impedance, but also can improve the lateral push resistance of the conductive elements 13 and the circuit board 12 Therefore, compared with the prior art, the display device 1 can avoid problems such as poor contact or falling off of the conductive element 13, thereby improving the protection ability of electromagnetic interference and electrostatic discharge.

In addition, please refer to FIG. 3A and FIG. 3B, wherein, FIG. 3A is a schematic diagram of the connection between the circuit board 12a and the conductive element 13 in another embodiment, and FIG. 3B is a diagram of the conductive pattern 121a of the circuit board 12a in FIG. 3A Top view schematic.

The main difference from FIG. 2A and FIG. 2B is that the number of these conductive parts 1211 of the conductive pattern 121a of the circuit board 12a of this embodiment is 6, and they are arranged in a two-dimensional matrix (arranged in two rows, each row has 3 conductive parts 1211). In addition, as shown in FIG. 3B , among the conductive portions 1211 of this embodiment, the length L1 along the first direction D1 is 1.5 mm, and the length L2 is also 1.5 mm, but they are located between the two conductive portions 1211 with a length of 1.5 mm. The length L3 of another conductive portion 1211 between them is only 1.0 mm, and the length L of the first surface S1 along the first direction D1 is also 5 mm, so (L1+L2+L3)/L=0.8. In addition, the distances d1 and d3 between two adjacent conductive parts 1211 along the first direction D1 are the same, both being 0.65 mm, so the distance d1 (or d3) between two adjacent conductive parts 1211 along the first direction D1 in this embodiment Greater than 0.5mm and less than 1.2mm (0.5mm<d1<1.2mm). In addition, the two conductive portions 1211 are partly exposed outside the first surface S1 of the conductive element 13 along the first direction D1 .

In addition, the widths W1 and W2 of these conductive parts 1211 along the second direction D2 in this embodiment are both 1.35 mm, and the distance d2 between two adjacent conductive parts 1211 along the second direction D2 is also 1.0 mm, so W1+d2 +W2=3.7mm, and the width W of the conductive element 13 along the second direction D2 is also 4mm (4>3.7), so these conductive parts 1211 are also completely covered by the conductive element 13 in the second direction D2.

It should be noted that in this embodiment, among the two rows of conductive parts 1211 along the first direction D1, the outer four conductive parts 1211 can also be connected to the conductive element 13 by welding, but the middle two conductive parts 1211 It can be connected with the conductive element 13 by welding or pasting. If the two conductive parts 1211 in the middle are selected to be connected by sticking, compared with the embodiment in Fig. When choosing to connect the conductive element 13 by welding, compared with the embodiment in FIG. 2A , it not only has a lower ground resistance value, but also has the advantage of higher connection strength.

It should be mentioned again that when the same amount of lateral pushing force and times are applied to the conductive element 13 along the second direction D2, compared with the prior art, the present embodiment has a lower contact resistance. In addition, compared with the prior art in which there is only one conductive portion along the first direction D1, if the same number of side pushing applications is applied, this embodiment not only has a lower contact resistance, but also requires more times. Only when the lateral pushing force is required, the conductive element 13 may have poor contact or fall off. Therefore, compared with the prior art, this embodiment can reduce the contact resistance between the conductive element 13 and the circuit board 12, and can also increase the lateral thrust stress intensity of the conductive element 13. Therefore, when the lateral thrust stress is generated, the The connection surface of the conductive element 13 and the circuit board 12 breaks or falls off, resulting in an open circuit, which affects the protection ability of electromagnetic interference and electrostatic discharge.

To sum up, in the display device of the present invention, the number of these conductive parts arranged at intervals in the grounding area of the circuit board along the first direction and the second direction is respectively multiple, and the conductive elements are arranged on the conductive pattern , and electrically connect these conductive parts, therefore, compared with the prior art, not only the grounding impedance between the conductive element and the grounding area can be reduced, but also the strength of the conductive element against lateral thrust can be improved, so that poor contact of the conductive element can be avoided Or falling off and other problems, thereby improving the protection ability of the display device from electromagnetic interference and electrostatic discharge.

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the claims.

Claims (9)

1. A display device, characterized in that, comprising: a display panel; A circuit board is arranged adjacent to the display panel and is electrically connected to the display panel. The circuit board has at least one conductive pattern arranged in a grounding area, and the conductive pattern includes a plurality of conductive parts arranged at intervals. The number of the conductive parts along a first direction and a second direction are respectively plural, and the first direction is substantially perpendicular to the second direction; and a conductive element disposed on the conductive pattern, and the conductive element is electrically connected to the conductive part; The conductive element has an elastic body and a metal layer, and the metal layer is disposed on the outer surface of the elastic body. 2. The display device according to claim 1, wherein the conductive parts are arranged in a two-dimensional matrix. 3. The display device according to claim 1, wherein at least part of the conductive part is directly connected to the conductive element by welding. 4. The display device according to claim 1, wherein the conductive element has a first surface, the first surface contacts the conductive pattern, and the length of the conductive portion along the first direction The sum is between 0.5 and 0.85 times the length of the first surface along the first direction. 5 . The display device according to claim 1 , wherein there is a distance between two adjacent conductive parts arranged along the first direction, and the distance is greater than 0.5 millimeters and less than 1.2 millimeters. 6 . The display device according to claim 1 , wherein at least one of the conductive parts has a part exposed outside the conductive element in the first direction. 7. The display device according to claim 1, wherein the conductive part is completely covered by the conductive element along the second direction. 8. The display device according to claim 1, further comprising: A metal piece, the conductive element has a first surface and a second surface opposite to the first surface, the first surface contacts the conductive part, and the second surface is in direct contact with the metal piece . 9. The display device according to claim 8, wherein the metal part is a casing or a back plate of the display device.