Disclosed are a circuit board and its preparation method. The circuit board includes a base layer, a transmission wire layer including multiple conductor tabs, and an insulating and thermally conductive layer including multiple thermally conductive portions. A gap is defined between each adjacent two of the multiple conductor tabs to expose at least a portion of the base layer, and the gap is filled with a corresponding thermally conductive portion. A height of the thermally conductive portion is larger than heights of each adjacent two of the multiple conductor tabs to define a connection groove. The circuit board the disclosure providing enhances heat dissipation performance of circuit boards.

A wiring module according to an embodiment of the present technology includes: a wiring board and a heat dissipation member. The wiring board includes a body portion and one or more heat dissipation vias, the body portion including a front surface layer to which a device package is connected and a rear surface layer opposite to the front surface layer, the one or more heat dissipation vias penetrating the body portion from the front surface layer to the rear surface layer. The heat dissipation member is connected to the rear surface layer so as to thermally bond with the one or more heat dissipation vias.

An electronic device with high density for component arrangement includes a first substrate, a second substrate, a plural of passages formed through the first and the second substrates, a first contact arranged on the first face of the first substrate to conceal the corresponding one of the passages, a second contact arranged on the second substrate and adjacent to the corresponding one of the passages, and a conductor disposed in the passages. A first end of the conductor electrically connects the first contact, while a second end of the conductor electrically connects the second contact.

A printed circuit board, on which at least one light emitting diode including at least two electrodes is mounted, includes a base member, an insulating layer disposed on the base member, a plurality of conductive pads disposed on the insulating layer and electrically connected to the light emitting diode, a plurality of via holes formed through at least one conductive pad of the plurality of conductive pads and at least a portion of each insulating layer, and filling members disposed in the plurality of via holes to electrically connect the base member to the at least one conductive pad, A distance between the plurality of via holes is ‘n’ times greater than a depth of at least one via hole of the plurality of via holes, in which ‘n’ is a positive integer greater than ‘1’ and less than ‘10’.

A circuit board according to an embodiment includes an insulating layer; and a via portion disposed in a via hole formed in the insulating layer; wherein the via portion includes: a first pad disposed on a lower surface of the insulating layer; a second pad disposed on an upper surface of the insulating layer; a third pad disposed in the via hole and disposed on the first pad; and a connection portion disposed in the via hole and disposed between the second pad and the third pad.

A printed circuit board and/or an electronic device including the same are provided. The printed circuit board and/or an electronic device includes at least one insulation layer including a first rigid region and a flexible region extending from the first rigid region, at least one first circuit pattern disposed on one surface of the at least one insulation layer to at least partially transverse the flexible region from the first rigid region, and at least one conductive pad formed at least partially on a surface of the first circuit pattern in the first rigid region, wherein the flexible region may be configured to flexibly deform more than the first rigid region.

An electronic device includes a housing, a first substrate, a second substrate, and an interposer disposed between the first substrate and the second substrate and configured to electrically connect the first substrate and the second substrate. The interposer includes a substrate, a first surface, a second surface, and a side surface. The interposer further includes a plurality of first conductive pads, a plurality of second conductive pads, a plurality of conductive posts, a plurality of third conductive terminals at least partially exposed on the first surface and electrically connected to the plurality of first conductive pads via a first conductive via (CV), and a plurality of fourth conductive terminals at least partially exposed on the second surface and electrically connected to the plurality of second conductive pads via a second CV.

A method for manufacturing a wiring substrate includes preparing a substrate including an insulating layer and metal foils, forming a through hole in the substrate to penetrate through the insulating layer and foils, forming a first plating film on the substrate such that the first film is formed on the entire surface of each metal foil and the inner wall of the hole, laminating one or more resin sheets on the first film such that the resin sheet or sheets cover the first film on the entire surface of a respective one of the foils, pressing the resin sheet or sheets such that resin is extruded from the resin sheet or sheets into the hole and fills space surrounded by the first film inside the hole, removing the resin sheet or sheets, and forming a second plating film on the substrate to cover surface of the resin in the hole.

A printed circuit board has a solder joint inspection system including a substrate surface having at least one solder pad thereon, at least one conductor wire having an end attached to the at least one solder pad, and a first inspection feature. A first inspection feature is marked on the substrate surface adjacent to the at least one solder pad to define a conductor end zone on the at least one solder pad. The end of the conductor wire is in the conductor end zone when properly attached. The at least one solder pad may define a second inspection feature to mark an extent to which the at least one solder pad is covered by a flow of solder when the wire is properly attached.

A circuit board according to an embodiment includes an insulating layer; a circuit pattern disposed on an upper surface of the insulating layer; a first solder resist disposed on an upper surface of the insulating layer and having a height smaller than a height of the circuit pattern; and a second solder resist disposed on an upper surface of the first solder resist and including a first portion having an upper surface lower than an upper surface of the circuit pattern and a second. portion having an upper surface higher than the upper surface of the circuit pattern, wherein the circuit pattern includes: a plurality of first circuit patterns disposed on an upper surface of a first region of the insulating layer, and a plurality of second circuit patterns disposed on an upper surface of a second region of the insulating layer; wherein the first portion of the second solder resist is disposed between the plurality of first circuit patterns to have an upper surface lower than an upper surface of the first circuit pattern; and wherein the second portion of the second solder resist has an upper surface higher than an upper surface of the second circuit pattern, and is disposed to cover the plurality of second circuit patterns between the plurality of second circuit patterns.