ELECTRICAL CONNECTION STRUCTURE AND ELECTRONIC DEVICE INCLUDING THE SAME

Disclosed are an electrical connection structure and an electronic device including the same. The electrical connection structure includes a first substrate, a first conductive pad, a second substrate, a second conductive pad, a through hole, and a conductive material is provided. The first conductive pad is disposed on the first substrate. The first conductive pad includes a first upper surface. The second conductive pad is disposed on the second substrate. The second conductive pad includes a second upper surface. The through hole penetrates the first substrate and exposes a part of the second upper surface. The conductive material is partially disposed in the through hole. The conductive material includes a narrowest portion and a first contact portion in contact with the second upper surface. A length of the first contact portion is greater than a length of the narrowest portion in a cross-sectional view.

BACKGROUND

Technical Field

The disclosure relates to a connection structure, and particularly relates to an electrical connection structure and an electronic device including the same.

Description of Related Art

Along with continuous expansion of applications and innovative technological development of electronic devices, requirements for an electrical connection structure and quality of the electronic devices are increasing so that the electronic devices are faced with different issues. Therefore, continuous update and adjustment for research and development of electronic devices may be required.

SUMMARY

The disclosure is directed to an electrical connection structure and an electronic device including the same.

According to an embodiment of the disclosure, an electrical connection structure includes a first substrate, a first conductive pad, a second substrate, a second conductive pad, a through hole, and a conductive material. The first conductive pad is disposed on the first substrate. The first conductive pad includes a first upper surface. The second conductive pad is disposed on the second substrate. The second conductive pad includes a second upper surface. The through hole penetrates the first substrate and exposes a part of the second upper surface. The conductive material is partially disposed in the through hole. The conductive material includes a narrowest portion and a first contact portion in contact with the second upper surface. A length of the first contact portion is greater than a length of the narrowest portion in a cross-sectional view.

According to an embodiment of the disclosure, an electronic device includes an electrical connection structure, an electronic component, a driving substrate; and a third conductive pad. The electrical connection structure includes a first substrate, a first conductive pad, a second substrate, a second conductive pad, a through hole, and a conductive material. The first conductive pad is disposed on the first substrate. The first conductive pad includes a first upper surface. The second conductive pad is disposed on the second substrate. The second conductive pad includes a second upper surface. The through hole penetrates the first substrate and exposes a part of the second upper surface. The conductive material is partially disposed in the through hole. The conductive material includes a narrowest portion and a first contact portion in contact with the second upper surface. A length of the first contact portion is greater than a length of the narrowest portion in a cross-sectional view. The electronic component is disposed on the first substrate, and electrically connected to the first conductive pad disposed on the first substrate. The third conductive pad is disposed on the driving substrate, and electrically connected to the second substrate.

Based on the above description, in the embodiments of the disclosure, the through hole penetrates the first substrate and exposes a part of the second upper surface of the second conductive pad, and the conductive material is partially disposed in the through hole, so that the first substrate and the second substrate have an electrical conduction path. Therefore, the electrical connection structure of the disclosure may achieve the effect of electrically connecting a plurality of substrates, and when it is subsequently applied to an electronic device, the electrical conduction path between the substrates may be shortened and a design of a peripheral region may be simplified, so as to achieve a slim border design of the electronic device. In addition, the conductive material includes the narrowest portion and the first contact portion in contact with the second upper surface. In a cross-sectional view, the length of the first contact portion is greater than the length of the narrowest portion, which increases a contact length between the conductive pad and the conductive material, and enhances a success rate of electrical connection of multiple substrates, so that the electrical connection structure of the disclosure may have better electrical reliability.

DESCRIPTION OF THE EMBODIMENTS

The disclosure may be understood by referring to the following detailed description in conjunction with the accompanying drawings. It should be noted that, in order to facilitate readers' understanding and to simplify the drawings, the drawings in the disclosure only depict a part of an electronic device, and specific elements in the drawings are not drawn according to actual scale. In addition, the number and size of each element in the figures are for illustration only, and are not intended to limit a scope of the disclosure.

Throughout the specification and the appended claims of the disclosure, certain terms may be used to refer to specific elements. Those skilled in the art will understand that electronic device manufacturers may refer to the same element by different names. This document does not intend to distinguish between elements that have the same function but have different names.

In the following description and claims, the words “comprising” and “including” are open-ended words, so they should be interpreted as meaning “including but not limited to . . . ”.

In addition, relative terms, such as “below” or “bottom” and “above” or “top,” may be used in the embodiments to describe a relative relationship of one element of the drawings to another element. It will be understood that if a device in the figures is turned upside down, elements described on a “lower” side would become elements described on an “upper” side.

In some embodiments of the disclosure, terms related to bonding and connection, such as “connect”, “interconnect”, etc., unless otherwise defined, may refer to that two structures are in direct contact, or may also refer to that the two structures are not directly (indirectly) in contact with each other, and there are other structures between the two structures. And the terms of joining and connecting may also include the case where both structures are movable, or both structures are fixed. Furthermore, a term “couple” includes transfer of energy between two structures by means of direct or indirect electrical connection, or transfer of energy between two separate structures by means of mutual induction.

It will be understood that when an element or a film layer is referred to as being “on” or “connected to” another element or film layer, it may be directly on or directly connected to the other element or film layer, or there are intervening elements or film layers there between (indirect case). In contrast, when an element is referred to as being “directly on” or “directly connected to” another element or film layer, there are no intervening elements or film layers there between.

In the disclosure, lengths, widths, thicknesses, heights or areas, or a distance or spacing between components may be measured by using an optical microscope (OM), a scanning electron microscope (SEM), a film thickness profiler (α-step), an ellipsometer, or other suitable methods. In detail, according to some embodiments, the scanning electron microscope may be used to obtain cross-sectional structure images of the components to be measured, and measure a length, a width, a thickness, a height or an area of each component, or a distance or spacing between components, but the disclosure is not limited thereto.

In addition, phrases “a given range is from a first value to a second value”, “a given range falls within a range from the first value to the second value” means that the given range includes the first value, the second value and other values there between. If a first direction is perpendicular to a second direction, an angle between the first direction and the second direction may be between 80 degrees and 100 degrees; if the first direction is parallel to the second direction, the angle between the first direction and the second direction may be between 0 and 10 degrees. The terms “about”, “equal to”, “equal” or “same”, “substantially” or “approximately” are generally construed as within 20% of a given value or range, or construed as within 10%, 5%, 3%, 2%, 1%, or 0.5% of the given value or range.

As used herein, the terms “film” and/or “layer” may refer to any continuous or discontinuous structures and materials (such as materials deposited by the methods disclosed herein). For example, films and/or layers may include two-dimensional materials, three-dimensional materials, nanoparticles, or even partial or complete molecular layers, or partial or complete atomic layers, or atom and/or molecular clusters. The film or layer may comprise a material or layer having pinholes, which may be at least partially continuous.

Although the terms first, second, third . . . may be used to describe various constituent elements, the constituent elements are not limited by the terms. These terms are only used to distinguish a single constituent element from other constituent elements in the specification.

The same terms may not be used in the claims, but replaced by first, second, third, . . . in the order in which the elements are recited in the claims. Therefore, in the following description, the first constituent element may be the second constituent element in the claims.

It should be noted that, in the following embodiments, the technical features in several different embodiments may be replaced, reorganized, and mixed to complete other embodiments without departing from the spirit of the disclosure.

Reference will now be made in detail to the exemplary embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals are used in the drawings and description to refer to the same or like parts.

FIG.1is a schematic cross-sectional view of an electrical connection structure according to an embodiment of the disclosure. Referring toFIG.1, in the embodiment, an electrical connection structure100aincludes a first substrate110a, a first conductive pad120a, a second substrate130, a second conductive pad140, a through hole150a, and a conductive material160a. The first conductive pad120ais disposed on the first substrate110a, where the first conductive pad120aincludes a first upper surface122a. The second conductive pad140is disposed on the second substrate130, where the second conductive pad140includes a second upper surface142. The through hole150apenetrates the first substrate110aand exposes a part of the second upper surface142. The conductive material160ais partially disposed in the through hole150a, where the conductive material160aincludes a narrowest portion162aand a first contact portion164ain contact with the second upper surface142. In a cross-sectional view, a length L12of the first contact portion164ais greater than a length L11of the narrowest portion162a, which may increase a contact length between the second conductive pad140and the conductive material160a, and improve a success rate of electrical connection between the first substrate110aand the second substrate130. In the embodiment, the through hole150asubstantially has a design of a wide top and a narrow bottom, but in order to avoid insufficient contact length between the conductive material160aand the second conductive pad140, the through hole150aofFIG.1may include a design of a through hole wide portion WR1and a through hole wide portion WR2at left and right sides. In a direction from the narrowest portion162ato the first contact portion164a, the through hole wide portion WR1and the through hole wide portion WR2include portions where a through hole diameter on the left and right sides of the through hole150agradually increases, and the through hole wide portion WR1and the through hole wide portion WR2are adjacent to the second conductive pad140. When the conductive material160afills the through hole wide portion WR1and the through hole wide portion WR2, the contact length between the second conductive pad140and the conductive material160amay be increased, and the success rate of the electrical connection between the first substrate110aand the second substrate130may also be improved. In some embodiments, the design of the through hole150amay include one of the through hole wide portion WR1and the through hole wide portion WR2. When the conductive material160afills one of the through hole wide portion WR1and the through hole wide portion WR2, the contact length of the second conductive pad140and the conductive material160amay also be improved, and the success rate of the electrical connection between the first substrate110aand the second substrate130may be improved.

The manner in which the conductive material160ais disposed in the through hole150amay include solder paste printing, inkjet printing, chemical vapor deposition, physical vapor deposition, electroplating, or other suitable methods, or a combination of the above methods, but the disclosure is not limited thereto. A material of the conductive material160amay include tantalum (Ta), niobium (Nb), hafnium (HO, nickel (Ni), chromium (Cr), cobalt (Co), zirconium (zirconium, Zr), tungsten (W), aluminum (Al), tin (Sn), copper (Cu), silver (Ag), aurum (Au) or other suitable metals, or alloys or combinations of the above materials, but the disclosure is not limited thereto. The through hole150amay be fabricated by, for example, mechanical drilling, laser drilling, ultrasonic drilling, micro electrical discharge machining (μ-EDM), micro powder blasting or inductively coupled plasma reactive ion etching (ICP-RIE) or other suitable methods, or a combination of the above methods, but the disclosure is not limited thereto.

In detail, in the embodiment, the first substrate110aand the second substrate130may be, for example, respectively rigid substrates, flexible substrates, or a combination thereof. A material of the first substrate110aand a material of the second substrate130may be, for example, glass, quartz, sapphire, ceramic, polycarbonate (PC), polyimide (PI), polyethylene terephthalate (PET), other suitable substrate materials, or a combination of the above materials, but the disclosure is not limited thereto. Furthermore, as shown inFIG.1, the electrical connection structure100aof the embodiment further includes an intermediate layer170disposed between the first substrate110aand the second substrate130and covering the second conductive pad140. The through hole150apenetrates the first substrate110aand a part of the intermediate layer170to expose a part of the second upper surface142. In other words, the intermediate layer170may be disposed between at least two of a plurality of substrates. A material of the intermediate layer170may include organic materials, inorganic materials, other suitable substrate materials, or a combination of the above materials, but the disclosure is not limited thereto. In some embodiments, the intermediate layer170may adhere at least two of the plurality of substrates.

Referring toFIG.1again, in the embodiment, the through hole150apenetrates the first conductive pad120a, the first substrate110aand a part of the intermediate layer170to expose a part of the second upper surface142of the second conductive pad140. A diameter of the through hole150amay be, for example, gradually reduced first and then gradually enlarged in a direction from the first substrate110atoward the second upper surface142, but the disclosure is not limited thereto. The narrowest portion162amay be located in the intermediate layer170, but the disclosure is not limited thereto. The conductive material160afills the through hole150aand extends to the first upper surface122aof the first conductive pad120alocated on both sides of the through hole150a, where the filled conductive material160aelectrically connects the first conductive pad120aand the second conductive pad140, which achieves an effect of vertically conducting (i.e., electrically connecting) the first substrate110aand the second substrate130.

Furthermore, the conductive material160aof the embodiment further includes a second contact portion166ain contact with the first upper surface122a, where a length L13of the second contact portion166ais greater than the length L11of the narrowest portion162a, which may increase a contact length between the first conductive pad120aand the conductive material160a, and improve the success rate of electrical connection between the first substrate110aand the second substrate130. As shown inFIG.1, the length L13of the second contact portion166ain the embodiment is greater than the length L12of the first contact portion164a, and the length L12of the first contact portion164ais greater than the length L11of the narrowest portion162a, which may increase the contact length between the first conductive pad120aand the conductive material160aand the contact length between the second conductive pad140and the conductive material160a, and improve the success rate of the electrical connection between the first substrate110aand the second substrate130. Furthermore, the conductive material160aof the embodiment has an arc-shaped upper surface1605, which may facilitate better sidewall step coverage during film deposition when film deposition is performed on the upper layer of the conductive material160a.

In brief, the through hole150apenetrates the first substrate110aand exposes a part of the second upper surface142of the second conductive pad140, and the conductive material160ais partially disposed in the through hole150a, so that the first substrate110aand the second substrate130may be electrically conducted. Therefore, the electrical connection structure100aof the embodiment may achieve the effect of electrically connecting a plurality of substrates, and when the electrical connection structure100ais subsequently applied to an electronic device, an electrical conduction path between the first substrate110aand the second substrate130may be greatly shortened, the design of the peripheral regions of the first substrate110aand the second substrate130may also be simplified, and the electronic device may achieve a design of slim border or even no border. In addition, in a cross-sectional view, the length L12of the first contact portion164aof the conductive material160ais greater than the length L11of the narrowest portion162aof the conductive material160a, and the through hole150amay be designed to include the through hole wide portion WR1and/or the through hole wide portion WR2, when the conductive material160afills the through hole wide portion WR1and/or the through hole wide portion WR2, the contact length between the second conductive pad140and the conductive material160amay be increased, and the success rate of the electrical connection between the first substrate110aand the second substrate130may also be improved, so that the electrical connection structure100aof the disclosure may have better electrical reliability.

It should be noted here that the following embodiments adopt the element numbers and a part of the contents of the previous embodiments, where the same numbers are used to represent the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted part, reference may be made to the foregoing embodiments, and repeated descriptions thereof in the following embodiments will not be repeated.

FIG.2is a schematic cross-sectional view of an electrical connection structure according to another embodiment of the disclosure. Referring toFIG.1andFIG.2at the same time, an electrical connection structure100bis similar to the electrical connection structure100aofFIG.1, and descriptions of similar parts thereof are not repeated here. A difference betweenFIG.1andFIG.2is: in the embodiment ofFIG.2, a first substrate110bincludes a base layer112and a dielectric layer114, where the dielectric layer114is disposed on the base layer112, and the first conductive pad120ais disposed on the dielectric layer114. A material of the base layer112is, for example, a polymer, and a material of the dielectric layer114is, for example, an inorganic material, but the disclosure is not limited thereto. In some embodiments, a multi-layer stacked structure (not shown) may be designed between the base layer112and the first conductive pad120a, for example, a conductive layer, a semiconductor layer, an insulating layer, a passivation layer, a light-emitting layer, an encapsulation layer or other suitable stacked layers, or a combination of the above stacked layers may be added there between, but the disclosure is not limited thereto.

FIG.3is a schematic cross-sectional view of an electrical connection structure according to another embodiment of the disclosure. Referring toFIG.1andFIG.3at the same time, an electrical connection structure100cis similar to the electrical connection structure100aofFIG.1, and descriptions of similar parts thereof are not repeated here. A difference betweenFIG.1andFIG.3is that in the embodiment ofFIG.3, an air gap G1is between a conductive material160cand the through hole150a, i.e., the conductive material160cfills the through hole wide portion WR1and the through hole wide portion WR2but not completely fill the through hole150a. In detail, in the embodiment, a first conductive pad120cincludes a side surface124c, where the side surface124cis adjacent to the through hole150a. The conductive material160cfills the through hole150aand extends along the side surface124cof the first conductive pad120cto a first upper surface122cof the first conductive pad120c. The conductive material160cincludes a narrowest portion162c, a first contact portion164cin contact with the second upper surface142, and a second contact portion166cin contact with the first upper surface122c, where a length L33of the second contact portion166cis greater than a length L31of the narrowest portion162c, and a length L32of the first contact portion164cis greater than the length L31of the narrowest portion162c, which may increase a contact length of the first conductive pad120c, the second conductive pad140and the conductive material160a, and improve a success rate of electrical connection between the first substrate110aand the second substrate130. In the embodiment ofFIG.3, the length L32of the first contact portion164cmay be greater than the length L33of the second contact portion166c. Here, the conductive material160cfills the through hole wide portion WR1and the through hole wide portion WR2and is in direct contact with the second conductive pad140, the side surface124cand the first upper surface122cof the first conductive pad120c, where the filled conductive material160cis electrically connected to the first conductive pad120cand the second conductive pad140, so as to achieve the effect of vertically conducting (i.e., electrically connecting) the first substrate110aand the second substrate130. The electrical connection structure100cof the embodiment may achieve the effect of electrically connecting a plurality of substrates, and when the electrical connection structure100cis subsequently applied to an electronic device, the electrical conduction path between the first substrate110aand the second substrate130may be greatly shortened, the design of the peripheral regions of the first substrate110aand the second substrate130may also be simplified, and the electronic device may achieve a design of slim border or even no border.

In some embodiments, the design of the through hole150amay include one of the through hole wide portion WR1and the through hole wide portion WR2, and when the conductive material160cfills one of the through hole wide portion WR1and the through hole wide portion WR2, the contact length between the second conductive pad140and the conductive material160cmay also be increased to improve the success rate of electrical connection between the first substrate110aand the second substrate130.

FIG.4is a schematic cross-sectional view of an electrical connection structure according to another embodiment of the disclosure. Referring toFIG.1andFIG.4at the same time, an electrical connection structure100dis similar to the electrical connection structure100aofFIG.1, and descriptions of similar parts thereof are not repeated here. One of the differences betweenFIG.1andFIG.4is that inFIG.4of the embodiment, an air gap G2is between a conductive material160dand a through hole150d, i.e., the conductive material160dfills the through hole wide portion WR1and the through hole wide portion WR2but does not completely fill the through hole150d. In detail, the conductive material160dis filled into the through hole150d, and the conductive material160dincludes a narrowest portion162d, a first contact portion164din contact with the second upper surface142, and a second contact portion166din contact with the first upper surface122a, where a length L43of the second contact portion166dis greater than a length L42of the first contact portion164d, and the length L42of the first contact portion164dis greater than a length L41of the narrowest portion162d, so that the contact length between the first conductive pad120a, the second conductive pad140and the conductive material160dmay be increased to improve the success rate of the electrical connection between the first substrate110aand the second substrate130. Here, the filled conductive material160dis electrically connected to the first conductive pad120aand the second conductive pad140, so as to achieve the effect of vertically conducting (i.e., electrically connecting) the first substrate110aand the second substrate130. The electrical connection structure100dof the embodiment may achieve the effect of electrically connecting a plurality of substrates, and when the electrical connection structure100dis subsequently applied to an electronic device, the electrical conduction path between the first substrate110aand the second substrate130may be greatly shortened, the design of the peripheral regions of the first substrate110aand the second substrate130may also be simplified, and the electronic device may achieve a design of slim border or even no border.

Moreover, the design of the through hole150dinFIG.4may have a relatively uniform through hole diameter at the beginning, and then further include the through hole wide portion WR1and the through hole wide portion WR2at a place adjacent to the second upper surface142. In some embodiments, the design of the through hole150dmay include one of the through hole wide portion WR1and the through hole wide portion WR2, and when the conductive material160dfills one of the through hole wide portion WR1and the through hole wide portion WR2, the contact length between the second conductive pad140and the conductive material160dmay also be improved to enhance the success rate of the electrical connection between the first substrate110aand the second substrate130.

FIG.5is a schematic cross-sectional view of an electrical connection structure according to another embodiment of the disclosure. Referring toFIG.1andFIG.5at the same time, an electrical connection structure100eis similar to the electrical connection structure100aofFIG.1, and similar part thereof are will not be repeated here. A difference betweenFIG.1andFIG.5is that in the embodiment inFIG.5, a through hole150eis generally narrow at the top and wide at the bottom, and penetrates a first conductive pad120e, the first substrate110aand a part of the intermediate layer170to expose a part of the second upper surface142of the second conductive pad140, where a diameter of the through hole150egradually increases in a direction from the first substrate110atoward the second upper surface142. When the through hole150epenetrates the first conductive pad120e, a part of the first substrate110ais exposed, and a conductive material160eincludes a narrowest portion162e, a first contact portion164ein contact with the second upper surface142, and a second contact portion166ein contact with a first upper surface122e, where a length of the narrowest portion162eis L51, and the length L51may be substantially a diameter of the through hole150ecorresponding to the upper surface of the first substrate110a. Furthermore, a length L53of the second contact portion166eis greater than a length L52of the first contact portion164e, and the length L52of the first contact portion164eis greater than the length L51of the narrowest portion162e, which may increase the contact length between the first conductive pad120eand the second conductive pad140and the conductive material160eto enhance the success rate of the electrical connection between the first substrate110aand the second substrate130. In addition, the filled conductive material160eelectrically connects the first conductive pad120eand the second conductive pad140to achieve the effect of vertically conducting (i.e., electrically connecting) the first substrate110aand the second substrate130. The electrical connection structure100eof the embodiment may achieve the effect of electrically connecting a plurality of substrates, and when the electrical connection structure100eis subsequently applied to an electronic device, the electrical conduction path between the first substrate110aand the second substrate130may be greatly shortened, the design of the peripheral regions of the first substrate110aand the second substrate130may also be simplified, and the electronic device may achieve a design of slim border or even no border.

FIG.6is a schematic cross-sectional view of an electrical connection structure according to another embodiment of the disclosure. Referring toFIG.1andFIG.6at the same time, an electrical connection structure100fis similar to the electrical connection structure100eofFIG.5, and descriptions of similar parts thereof are not repeated here. A difference betweenFIG.5andFIG.6is that in the embodiment inFIG.6, a through hole150fincludes the through hole wide portion WR1and the through hole wide portion WR2. The through hole150fpenetrates the first conductive pad120e, the first substrate110a, and a part of the intermediate layer170to expose a part of the second upper surface142of the second conductive pad140, where a diameter of the through hole150fincludes the through hole wide portion WR1and the through hole wide portion WR2, and a shape of the through hole150ffrom the first substrate110ato the second upper surface142is like a stepped through hole (increasing gradually in two stages in a stepped manner). A conductive material160fincludes a narrowest portion162f, a first contact portion164fin contact with the second upper surface142, and a second contact portion166fin contact with the first upper surface122e, where a length L63of the second contact portion166fis greater than a length L62of the first contact portion164f, and the length L62of the first contact portion164fis greater than a length L61of the narrowest portion162f, which may increase the contact length of the first conductive pad120e, the second conductive pad140and the conductive material160f, and enhance the success rate of electrical connection between the first substrate110aand the second substrate130. In addition, the filled conductive material160felectrically connects the first conductive pad120eand the second conductive pad140to achieve the effect of vertically conducting (i.e., electrically connecting) the first substrate110aand the second substrate130. The electrical connection structure100fof the embodiment may achieve the effect of electrically connecting a plurality of substrates, and when the electrical connection structure100fis subsequently applied to an electronic device, the electrical conduction path between the first substrate110aand the second substrate130may be greatly shortened, the design of the peripheral regions of the first substrate110aand the second substrate130may also be simplified, and the electronic device may achieve a design of slim border or even no border. In some embodiments, the design of the through hole150fmay include one of the through hole wide portion WR1and the through hole wide portion WR2. When the conductive material160ffills one of the through hole wide portion WR1and the through hole wide portion WR2, the contact length between the second conductive pad140and the conductive material160fmay be increased to enhance the success rate of electrical connection between the first substrate110aand the second substrate130.

FIG.7is a schematic cross-sectional view of an electrical connection structure according to another embodiment of the disclosure. Referring toFIG.6andFIG.7at the same time, an electrical connection structure100gis similar to the electrical connection structure100fofFIG.6, and descriptions of similar parts thereof are not repeated here. A difference betweenFIG.6andFIG.7is that: in the embodiment ofFIG.7, the first substrate110bincludes the base layer112and the dielectric layer114, where the dielectric layer114is disposed on the base layer112, and the first conductive pad120eis disposed on the dielectric layer114. A material of the base layer112is, for example, a polymer, and a material of the dielectric layer114is, for example, an inorganic material, but the disclosure is not limited thereto. In some embodiments, a multi-layer stacked structure (not shown) may be designed between the base layer112and the first conductive pad120e, for example, a conductive layer, a semiconductor layer, an insulating layer, a passivation layer, a light-emitting layer, an encapsulation layer, or other suitable stacked layers, or a combination of the stacked layers may be added there between, but the disclosure is not limited thereto.

FIG.8is a schematic cross-sectional view of an electrical connection structure according to another embodiment of the disclosure. Referring toFIG.6andFIG.8at the same time, an electrical connection structure100his similar to the electrical connection structure100fofFIG.6, and descriptions of similar parts thereof are not repeated here. A difference betweenFIG.6andFIG.8is that: in the embodiment ofFIG.8, an air gap G3is between a conductive material160hand the through hole150f, i.e., the conductive material160hfills the through hole wide portion WR1and the through hole wide portion WR2but does not completely fill the through hole150f. In detail, in the embodiment, a first conductive pad120hincludes a side surface124h, where the side surface124his adjacent to the through hole150f. The conductive material160his filled into the through hole150fand extends along the side surface124hof the first conductive pad120hto a first upper surface122hof the first conductive pad120h. The conductive material160hincludes a narrowest portion162h, a first contact portion164hin contact with the second upper surface142, and a second contact portion166hin contact with the first upper surface122h, where a length L83of the second contact portion166his greater than a length L81of the narrowest portion162h, and a length L82of the first contact portion164his greater than the length L81of the narrowest portion162h, which increases a contact length of the first conductive pad120h, the second conductive pad140and the conductive material160h, and enhances a success rate of electrical connection between the first substrate110aand the second substrate130. In the embodiment ofFIG.8, the length L82of the first contact portion164hmay be greater than the length L83of the second contact portion166h. Here, the conductive material160hfills the through hole wide portion WR1and the through hole wide portion WR2and is in direct contact with the second conductive pad140, the side surface124hof the first conductive pad120h, and the first upper surface122h, where the filled conductive material160helectrically connects the first conductive pad120hand the second conductive pad140to achieve the effect of vertically conducting (i.e., electrically connecting) the first substrate110aand the second substrate130. The electrical connection structure100hof the embodiment may achieve the effect of electrically connecting a plurality of substrates, and when the electrical connection structure100his subsequently applied to an electronic device, the electrical conduction path between the first substrate110aand the second substrate130may be greatly shortened, the design of the peripheral regions of the first substrate110aand the second substrate130may also be simplified, and the electronic device may achieve a design of slim border or even no border.

In some embodiments, the design of a through hole150hmay include one of the through hole wide portion WR1and the through hole wide portion WR2. When the conductive material160hfills one of the through hole wide portion WR1and the through hole wide portion WR2, the contact length between the second conductive pad140and the conductive material160hmay be increased to enhance the success rate of electrical connection between the first substrate110aand the second substrate130.

FIG.9is a schematic cross-sectional view of an electrical connection structure according to another embodiment of the disclosure. Referring toFIG.6andFIG.9at the same time, an electrical connection structure100iis similar to the electrical connection structure100fofFIG.6, and descriptions of similar parts thereof are not repeated here. A difference betweenFIG.6andFIG.9is that: in the embodiment ofFIG.9, an air gap G4is between a conductive material160iand the through hole150f, i.e., the conductive material160ifills the through hole wide portion WR1and the through hole wide portion WR2but does not completely fill the through hole150f. In detail, the conductive material160iis filled into the through hole150f, and the conductive material160iincludes a narrowest portion162i, a first contact portion164iin contact with the second upper surface142, and a second contact portion166iin contact with the first upper surface122e, where a length L93of the second contact portion166iis greater than a length L92of the first contact portion164i, and the length L92of the first contact portion164iis greater than a length L91of the narrowest portion162i, which increases a contact length of the first conductive pad120e, and the second conductive pad140with the conductive material160ito enhance a success rate of electrical connection between the first substrate110aand the second substrate130. The filled conductive material160ielectrically connects the first conductive pad120eand the second conductive pad140to achieve the effect of vertically conducting (i.e., electrically connecting) the first substrate110aand the second substrate130. The electrical connection structure100iof the embodiment may achieve the effect of electrically connecting a plurality of substrates, and when the electrical connection structure100iis subsequently applied to an electronic device, the electrical conduction path between the first substrate110aand the second substrate130may be greatly shortened, the design of the peripheral regions of the first substrate110aand the second substrate130may also be simplified, and the electronic device may achieve a design of slim border or even no border.

In some embodiments, the design of the through hole150fmay include one of the through hole wide portion WR1and the through hole wide portion WR2. When the conductive material160ifills one of the through hole wide portion WR1and the through hole wide portion WR2, the contact length between the second conductive pad140and the conductive material160imay be increased to enhance the success rate of electrical connection between the first substrate110aand the second substrate130.

FIG.10is a schematic cross-sectional view of an electronic device using the electrical connection structure ofFIG.1. Referring toFIG.10, in the embodiment, an electronic device10includes the electrical connection structure100aofFIG.1, an electronic component20, a driving substrate30and a third conductive pad180, where the second substrate130further includes a conductive via135electrically connected to the second conductive pad140. The electronic component20is disposed on the first substrate110aand are electrically connected to the first conductive pad120adisposed on the first substrate110a. The third conductive pad180is disposed on the driving substrate30and is electrically connected to the conductive via135of the second substrate130. In other words, the electronic device10of the embodiment may realize the electrical connection of a plurality of substrates through the electrical connection structure100a. In addition, the electronic device10of the embodiment may be provided with any electrical connection structure (i.e., any one of the electrical connection structures100ato100i) in the above-mentioned specification. In some embodiments, a plurality of electrical connection structures may be provided in the electronic device10, where the electrical connection structures may be provided with any one of the electrical connection structures in the above specification or a combination of the above electrical connection structures, but the disclosure is not limited thereto. Here, the electronic device10of the embodiment may include a display device, an antenna device, a sensing device, a light-emitting device, a touch display device, a packaging device, a curved display, a free-form display, or a splicing device, but the disclosure is not limited thereto. The electronic device10may include a bendable or flexible electronic device. The electronic device10may include a plurality of light boards electrically connected to each other. The electronic device10includes, for example, a liquid crystal layer or light emitting diodes (LED). The electronic component20may include passive components and active components, such as capacitors, resistors, inductors, variable capacitors, filters, diodes, transistors, inductors, MEMS, liquid crystal chips, etc., but the disclosure is not limited thereto. The diodes may include light emitting diodes or photodiodes. The light emitting diodes may include, for example, organic light emitting diodes (OLEDs), mini LEDs, micro LEDs, quantum dot LEDs, fluorescence, phosphor or other suitable materials, or a combination thereof, but the disclosure is not limited thereto. The sensors may include, for example, capacitive sensors, optical sensors, electromagnetic sensors, fingerprint sensors (FPS), touch sensors, antennas, or styluses (pen sensors), etc., but the disclosure is not limited thereto. The antenna is, but not limited to, a liquid crystal antenna, a diode antenna. An antenna device may include, but is not limited to, an antenna splicing device. It should be noted that, the electronic device10may be any arrangement and combination of the above, but the disclosure is not limited thereto. In addition, the electronic device10may have a rectangular shape, a circular shape, a polygonal shape, a shape with curved edges, or other suitable shapes in appearance. The electronic device10may have peripheral systems such as a driving system, a control system, a light source system, a shelf system, etc., to support a display device, an antenna device or a splicing device.

It should be noted that, in the above-mentioned embodiments, the number of electrical connection structures is schematically shown as one, and the number of substrates is schematically shown as two or three, but the disclosure is not limited thereto. In other not-shown embodiments, the number of electrical connection structures and the number of substrates may be increased according to actual requirements, which still fall within the scope of the disclosure. Moreover, the electrical connection structure may be selected from any one of the electrical connection structures in the above-mentioned specification or a combination of the above-mentioned electrical connection structures, but the disclosure is not limited thereto.

In summary, in the embodiments of the disclosure, the through hole penetrates the first substrate and exposes a part of the second upper surface of the second conductive pad, and the conductive material is partially disposed in the through hole, so that the first substrate and the second substrate may be electrically conducted. Therefore, the electrical connection structure of the disclosure may achieve the effect of electrically connecting a plurality of substrates, and when it is subsequently applied to an electronic device, the electrical conduction path between the substrates may be shortened and a design of a peripheral region of the substrate may be simplified, so as to achieve a slim border design or even no border design of the electronic device. In addition, the conductive material includes the narrowest portion and the first contact portion in contact with the second upper surface. In a cross-sectional view, the length of the first contact portion is greater than the length of the narrowest portion, which increases a contact length between the conductive pad and the conductive material, and enhances a success rate of electrical connection of multiple substrates, so that the electrical connection structure of the disclosure may have better electrical reliability.