JP7629366B2 - Circuit board, assembly part set of electrical device, and electrical device - Google Patents

Description

The present disclosure relates to circuit boards, assembly component sets for electrical devices, and electrical devices.

In recent years, as described in the following Patent Document 1, development has been carried out on backlights for liquid crystal displays as an example of an electrical device. A technology called local dimming is used in backlights. Local dimming is a technology in which the backlight is divided into multiple regions and the brightness of each of the multiple regions is controlled separately.

In the backlight disclosed in the above-mentioned Patent Document 1, each of the multiple regions in which local dimming is performed is configured by a circuit board on which a light-emitting element is mounted. More specifically, in the backlight, multiple circuit boards are arranged in a matrix. Furthermore, multiple light-emitting elements, for example multiple LEDs (Light Emitting Diodes), are mounted on the surface of each of the multiple circuit boards. The multiple LEDs are electrically connected to form an electric circuit on the surface of the circuit board.

JP 2007-288194 A

In the backlight disclosed in the above-mentioned Patent Document 1 as an example of an electrical device, the board electrical paths extend from the rear surface of each of a set of circuit boards arranged in a matrix to an LED control board. Therefore, the pattern of the board electrical paths on the rear surface is different for each of the circuit boards in the set. Therefore, when the size of the backlight is changed, it becomes necessary to change the board electrical paths on the rear surface of the set of circuit boards. Therefore, it is not possible to flexibly accommodate changes in the size of the backlight. In other words, it is not easy to change the size of the electrical device.

The present disclosure has been made in consideration of the above-mentioned problems. An object of the present disclosure is to provide a circuit board, an assembly part set for an electrical device, and an electrical device that can be easily resized.

A circuit board according to one embodiment of the present disclosure includes a board on which an electric circuit is provided, a first connector including a pair of circuit pins connected to the electric circuit and a pair of first pins separated from the electric circuit, a second connector including a pair of second pins, and a pair of board electrical circuits connecting the pair of first pins and the pair of second pins.

An assembly part set for an electric device according to one embodiment of the present disclosure includes a first circuit board, a second circuit board, and a first connection portion that can be connected to the first circuit board and the second circuit board, and each of the first circuit board and the second circuit board includes a board on which an electric circuit is provided, a first connector including a pair of circuit pins connected to the electric circuit and a pair of first pins separated from the electric circuit, a second connector including a pair of second pins, and a pair of board electrical paths that connect the pair of first pins and the pair of second pins, and the first connection portion includes a pair of connection electrical paths that can electrically connect the pair of second pins of the first circuit board and the pair of circuit pins of the second circuit board.

An electrical device according to one aspect of the present disclosure includes a first circuit board, a second circuit board, a first connection portion connected to the first circuit board and the second circuit board, and a control portion for controlling the first circuit board and the second circuit board, and each of the first circuit board and the second circuit board includes a board on which an electrical circuit is provided, a first connector including a pair of circuit pins connected to the electrical circuit and a pair of first pins separated from the electrical circuit, a second connector including a pair of second pins, and a pair of board electrical connectors connecting the pair of first pins and the pair of second pins. The first connection portion includes a pair of connection paths that electrically connect the pair of second pins of the first circuit board and the pair of circuit pins of the second circuit board, and the control portion transmits a first signal that controls the electric circuit of the first circuit board via the pair of circuit pins of the first circuit board, and transmits a second signal that controls the electric circuit of the second circuit board via the pair of first pins, the pair of board paths, and the pair of second pins of the first circuit board, and the pair of circuit pins of the second circuit board.

2 is a schematic plan view of a surface of a circuit board according to the first embodiment. FIG. 2 is a schematic plan view of a surface of a connection portion according to the first embodiment. FIG. 2 is a schematic plan view of a surface of a backlight of an example of an electric device according to the first embodiment. FIG. 11 is a schematic plan view of the front surface of a circuit board according to a second embodiment. FIG. 13 is a schematic plan view of the surface of a connection portion according to a second embodiment. FIG. 11 is a schematic plan view of a surface of a backlight of an example of an electric device according to a second embodiment. FIG. 13 is a schematic plan view of a surface of a backlight of an example of an electric device according to a third embodiment. FIG. 13 is a schematic plan view of the rear surface of a backlight of an example of an electric device according to a third embodiment. FIG.

The circuit board, electrical device assembly part set, and electrical device of the present disclosure will be described below with reference to the drawings. Note that in the drawings, identical or equivalent elements are given the same reference numerals, and redundant descriptions of identical or equivalent elements will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic plan view of a circuit board CB according to the first embodiment.

As shown in FIG. 1, the circuit board CB includes a substrate B and a first connector C1 and a second connector C2 provided on the surface of the substrate B. In a plan view, the structure provided on the surface of the circuit board CB is symmetrical with respect to an imaginary line connecting the midpoints of the opposing long sides of the rectangle. In this embodiment, nothing is formed on the back surface of the circuit board CB. In other words, in this embodiment, only the flat surface of the substrate B exists as the back surface of the circuit board CB.

The substrate B is a plate material having a rectangular shape in a plan view. The substrate B has insulating properties. An electric circuit EC is provided on the surface of the substrate B. A pair of substrate electrical paths EP and another pair of substrate electrical paths EPa are provided on the surface of the substrate B. The pair of substrate electrical paths EP are made up of a pair of electrical wiring EW. The other pair of substrate electrical paths EPa are also made up of a pair of electrical wiring EW. However, the pair of substrate electrical paths EP and the other pair of substrate electrical paths EPa may be any path through which electricity flows, and may include metal fittings (not shown) other than the electrical wiring EW.

The electric circuit EC includes a plurality of light-emitting elements L. The plurality of light-emitting elements L are connected in series by circuit wiring CW printed on the surface of the substrate B. Each of the plurality of light-emitting elements L is an LED (Light Emitting Diode). In this embodiment, the plurality of light-emitting elements L are arranged in a matrix on the surface of the substrate B. Therefore, the light emitted by the plurality of light-emitting elements L on the surface of the substrate B is made uniform.

The multiple light-emitting elements L and circuit wiring CW that make up the electric circuit EC shown in FIG. 1 are arranged symmetrically with respect to an imaginary line (not shown) that connects the midpoints of the opposing long sides of the rectangle of the substrate B. However, in FIG. 1, to make the drawing easier to understand, the light-emitting elements to the right of the imaginary line are not given reference symbols.

The electric circuit EC may include any element such as a capacitor, a resistor, a coil, a transistor, or any other circuit element in addition to or instead of the plurality of light-emitting elements L. In other words, the electric circuit EC may be anything that functions as an electric circuit.

The first connector C1 includes a pair of circuit pins CP and a pair of first pins P1. The pair of circuit pins CP are each connected to both ends of an electric circuit EC. The pair of first pins P1 are not connected to the electric circuit EC. In other words, the pair of first pins P1 are isolated from the electric circuit EC. The first connector C1 further includes another pair of first pins P1a.

The second connector C2 includes a pair of second pins P2. The pair of second pins P2 is not connected to the electric circuit EC. In other words, the pair of second pins P2 is isolated from the electric circuit EC. The second connector C2 includes another pair of second pins P2a. The other pair of second pins P2a is not connected to the electric circuit EC. In other words, the other pair of second pins P2a is isolated from the electric circuit EC.

In this specification, all pins may be of any type as long as they are conductive and function as electrical connections.

In this embodiment, the first connector C1 and the second connector C2 each have a rod shape extending in the longitudinal direction, i.e., along the long side, of the rectangular substrate B. The first connector C1 and the second connector C2 are arranged on the surface of the substrate B so as to face each other. A pair of substrate electrical paths EP are provided between the first connector C1 and the second connector C2. This allows the substrate electrical paths EP to be shortened. Therefore, the area occupied by the pair of substrate electrical paths EP on the main surface of the substrate B can be reduced. As a result, the main surface of the substrate B can be used effectively.

The pair of board electrical paths EP includes a plurality of electrical wirings EW printed on the main surface of the board B. Each of the pair of board electrical paths EP connects a pair of first pins P1 and a pair of second pins P2. Therefore, an electrical signal can be transmitted to another circuit board CB via one circuit board CB using the pair of board electrical paths EP. Specifically, as described later with reference to FIG. 3, the control unit CT can transmit an electrical signal to the second circuit board CB (2) via the first circuit board CB (1).

Also, as shown in FIG. 1, the other pair of board electrical paths EPa are respectively connected to the other pair of first pins P1a and the other pair of second pins P2a. Therefore, an electrical signal can be transmitted to the other circuit board CB via the other pair of board electrical paths EPa of one circuit board CB and the pair of board electrical paths EP of the other circuit board CB. More specifically, as described later with reference to FIG. 6, the control unit CT can transmit a signal to the third circuit board CB(3) via the other pair of board electrical paths EPa of the first circuit board CB(1) and the pair of board electrical paths EP of the second circuit board CB(2).

Figure 2 is a schematic plan view of the surface of the connection part CN in embodiment 1.

As shown in FIG. 2, the connection part CN can be connected to each of the two circuit boards CB. The connection part CN is composed of a flexible flat cable (FFC). In FIG. 2, only the wiring part of the FFC is illustrated from the viewpoint of ease of viewing the drawing. Both ends of the connection part CN are provided with one connector CX and the other connector CY. The one connector CX and the other connector CY are connected to the first connector C1 and the second connector C2, respectively. Specifically, the one connector CX is inserted into the recess of the first connector C1 along the surface of the board B. The other connector CY is inserted into the recess of the second connector C2 along the surface of the board B. The circuit board CB connection part CN includes a pair of connection electric paths LP. The pair of connection electric paths LP can electrically connect a pair of second pins P2 of one of the two circuit boards CB to a pair of circuit pins CP of the other of the two circuit boards CB (see FIG. 3).

The assembly parts set for an electric device in this embodiment includes a plurality of circuit boards CB shown in FIG. 1 and at least one connection part CN shown in FIG. 2. In this specification, the assembly parts set for an electric device refers to a state in which the plurality of circuit boards CB and at least one connection part CN are each individually separated but form a set. With this assembly parts set for an electric device, the size of an electric device, for example, a backlight BL (see FIG. 3 and FIG. 6) of a liquid crystal display device described later, can be changed simply by increasing or decreasing the number of circuit boards CB and the number of connection parts CN. In other words, in order to change the size of the electric device, it is not necessary to change either the pair of board electric paths EP or the other pair of connection electric paths LPa. Therefore, the size of the electric device can be easily changed.

Furthermore, the connection portion CN includes another pair of connection electric paths LPa. The other pair of connection electric paths LPa can electrically connect another pair of second pins P2a of one circuit board CB to a pair of first pins P1 of the other circuit board CB. More specifically, the other pair of connection electric paths LPa can electrically connect another pair of second pins P2a of the first circuit board CB(1) to a pair of first pins P1 of the second circuit board CB(2), as described later with reference to FIG. 6. Therefore, three circuit boards CB can be electrically connected by two connection portions CN.

In addition, the connection portion CN can be connected to each of the two circuit boards CB so as to cross the longitudinal direction of the board B, specifically, the opposing long sides of the rectangular board B (see Figures 3 and 6). Therefore, the multiple boards B are arranged so as to line up along the short side direction of each of the multiple boards B. As a result, the variety of adjustments of the overall size of an electrical device, for example, a backlight BL (see Figures 3 and 6), can be increased compared to when the multiple boards B are arranged so as to line up along the long side direction of the rectangle.

In this embodiment, the first connector C1 and the second connector C2 have the same shape. Therefore, the connection portion CN can be connected to each of the first connector C1 and the second connector C2 without considering the orientation of the substrate B.

Figure 3 is a schematic plan view of the surface of the backlight BL of a liquid crystal display device, which is an example of an electrical device according to embodiment 1.

The backlight BL of this embodiment includes two circuit boards CB, a first circuit board CB(1) and a second circuit board CB(2), a connection unit CN, and a control unit CT. The configurations of the first circuit board CB(1) and the second circuit board CB(2) are the same as the configuration of the circuit board CB described using FIG. 1. One connector CX and the other connector CY of the connection unit CN are connected to the first circuit board CB(1) and the second circuit board CB(2), respectively. The connection unit CN(1) includes a pair of connection paths LP that electrically connect a pair of second pins P2 of the first circuit board CB(1) and a pair of circuit pins CP of the second circuit board CB(2). The configuration of the connection unit CN is the same as the configuration described using FIG. 2.

The control unit CT is connected to each of the pair of circuit pins CP and the pair of first pins P1 of the first circuit board CB(1) so as to be able to transmit an electric signal via an electric path. The control unit CT transmits a first signal to control the electric circuit EC of the first circuit board CB(1) via the pair of circuit pins CP of the first circuit board CB(1). The control unit CT transmits a second signal to control the electric circuit EC of the second circuit board CB(2) via the pair of first pins P1, the pair of board electric paths EP, and the pair of second pins P2 of the first circuit board CB(1), and the pair of circuit pins CP of the second circuit board CB(2). Therefore, the control unit CT can independently control each of the electric circuit EC of the first circuit board CB(1) and the electric circuit CB of the second circuit board CB(2). As a result, local dimming of the backlight BL can be performed.

In addition, in the backlight BL of this embodiment, a pair of substrate electrical paths EP, another pair of substrate electrical paths EPa, a pair of connecting electrical paths LP, and another pair of connecting electrical paths LPa are arranged to cross the long side of the substrate. Therefore, the overall electrical path length can be shortened compared to when a pair of substrate electrical paths EP, another pair of substrate electrical paths EPa, a pair of connecting electrical paths LP, and another pair of connecting electrical paths LPa are arranged along the long side direction of the substrate B.

In this embodiment, the first connectors C1 of the multiple circuit boards CB each have the same structure. The second connectors C2 of the multiple circuit boards CB each have the same structure. At least one connection portion CN each has the same structure. Therefore, the multiple circuit boards CB can be electrically connected by one or more connection portions CN without considering the relative positions of the multiple circuit boards CB. Therefore, the backlight BL, which is an example of an electrical device, can be easily assembled.

Furthermore, each of the substrates B of the multiple circuit substrates CB, the electric circuit EC including the multiple light-emitting elements L, and the pair of substrate electrical paths EP have the same shape. Therefore, even if the multiple circuit substrates CB are connected at least one connection portion CN without considering the relative positions of the multiple circuit substrates CB, a backlight BL that emits light in a similar manner can be manufactured. This makes it easy to manufacture the backlight BL.

(Embodiment 2)
A circuit board, an assembly part set for an electric device, and an electric device according to the second embodiment will be described with reference to the drawings. Note that the following description of the same points as those in the first embodiment will not be repeated. The present embodiment differs from the first embodiment in the following points.

Figure 4 is a schematic plan view of the surface of the circuit board CB of embodiment 2.

As can be seen from FIG. 4, the circuit board CB of this embodiment differs from the circuit board CB of embodiment 1 in the shape and arrangement of each component, but the function of each component is the same. The multiple light-emitting elements L and circuit wiring CW that make up the electric circuit EC shown in FIG. 4 are arranged symmetrically with respect to an imaginary line (not shown) connecting the midpoints of the opposing long sides of the rectangle of the board B. However, in FIG. 4, to make the drawing easier to understand, the light-emitting elements to the right of the imaginary line are not given reference symbols.

Figure 5 is a schematic plan view of the connection portion CN in embodiment 2.

As can be seen from FIG. 5, the shape and arrangement of each component of the connection part CN of this embodiment is almost the same as that of the connection part CN of embodiment 1, and the function of each component is the same. Also, as with FIG. 2, from the viewpoint of ease of viewing the drawing, only the wiring of the FFC is drawn in FIG. 5.

Figure 6 is a schematic plan view of the backlight BL of the liquid crystal display device of embodiment 2.

The configurations of the first circuit board CN(1), first connection part CN(1), and second circuit board CB(2) of the backlight L of this embodiment are basically the same as the configurations of the first circuit board CN(1), connection part CN, and second circuit board CB(2) of the backlight BL of embodiment 1. The backlight BL of this embodiment further includes a second connection part CN(2) and a third circuit board CB(3) in addition to the configuration of the backlight BL of embodiment 2. In other words, the three circuit boards CB consisting of the first circuit board CB(1), the second circuit board CB(2), and the third circuit board CB(3) are connected by two connection parts CN consisting of the first connection part CN(1) and the second connection part CN(2).

More specifically, a pair of circuit pins CP of the first circuit board CB(1) is electrically connected to the electric circuit EC. Also, a pair of first pins P1, a pair of board electrical paths EP, and a pair of second pins P2 of the first circuit board CB(1) and a pair of connecting electrical paths LP of the first connection part CN(1) are electrically connected in this order. Also, a pair of connecting electrical paths LP of the first connection part CN(1) and a pair of circuit pins CP and an electric circuit EC of the second circuit board CB(2) are electrically connected in this order.

Furthermore, the other pair of first pins P1a, the other pair of board electrical paths EPa, and the other pair of second pins P2a of the first circuit board CB(1), and the other pair of connecting electrical paths LPa of the first connection part CN(1) are electrically connected in this order. Furthermore, the other pair of connecting electrical paths LPa of the first connection part CN(1), and the pair of first pins P1, the pair of board electrical paths EP, and the pair of second pins P2 of the second circuit board CB(2) are electrically connected in this order. In addition, the pair of second pins P2 of the second circuit board CB(2), the pair of connecting electrical paths LP of the second connection part CN(1), and the circuit pins CP and electrical circuit EC of the third circuit board CB(3) are electrically connected in this order.

The control unit CT transmits a third signal to the electric circuit EC of the third circuit board CN (3). Specifically, the third signal is first transmitted from the other pair of first pins P1a, the other pair of board electric paths EPa, and the other pair of second pins P2a of the first circuit board CB (1) to the other pair of connection electric paths LPa of the first connection part CN (1). Next, the third signal is transmitted from the other pair of connection electric paths LPa of the first connection part CN (1) to the pair of connection electric paths LP of the second connection part CN via the pair of first pins P1, the pair of board electric paths EP, and the pair of second pins P2 of the second circuit board CN (2). Furthermore, the third signal is transmitted from the pair of connection electric paths LP of the second connection part CN to the electric circuit EC of the third circuit board CN (3) via the circuit pins CP of the third circuit board CN (3). Therefore, the control unit CT can send signals independently to the electrical circuits EC of the first circuit board CB(1), the second circuit board CB(2), and the third circuit board CB(3).

The circuit board CB, electrical device assembly part set, and electrical device of this embodiment can provide the same effects as those provided by the circuit board CB, electrical device assembly part set, and electrical device of embodiment 1.

(Embodiment 3)
A circuit board, an assembly part set for an electric device, and an electric device according to the third embodiment will be described with reference to the drawings. Note that the following description of the same points as those in the second embodiment will not be repeated. The present embodiment differs from the second embodiment in the following respects.

Figure 7 is a schematic plan view of the front side of the backlight BL of a liquid crystal display device, which is an example of an electrical device according to embodiment 3. Figure 8 is a schematic plan view of the rear side of the backlight BL of a liquid crystal display device, which is an example of an electrical device according to embodiment 3.

As shown in FIG. 7, the backlight BL of the example of the electrical device of this embodiment has the same structure as the backlight BL of the example of the electrical device of the second embodiment with respect to the front surface. Also, as shown in FIG. 8, the backlight BL of this embodiment has, in addition to the configuration of the backlight BL of the second embodiment, a third connector C1, a fourth connector C4, and another pair of board electrical paths EPR on the rear side of the board B. The third connector C3 includes a pair of third pins P3 separated from the electrical circuit EC on the front surface. In other words, the pair of third pins P3 is not connected to the electrical circuit EC. Also, the fourth connector C4 includes a pair of fourth pins P4. The fourth connector C4 includes a pair of fourth pins P4 separated from the electrical circuit EC on the front surface. The pair of fourth pins P4 is not connected to the electrical circuit EC. Another pair of board electrical paths EPR is connected to the pair of third pins P3 and the pair of fourth pins P4. As can be seen from Figures 7 and 8, the backlight BL of this embodiment includes a fourth circuit board CN (4) and a third connection part CN (3) in addition to the configuration of the backlight BL of embodiment 2.

As can be seen from Figures 7 and 8, all circuit boards CB have the same structure. All connection parts CN have the same structure. The connector CY and connector CX of the third connection part CN (3) are connected to the fourth connector C4 on the back surface of the first circuit board CB (1) and the first connector C1 on the front surface of the fourth circuit board CB (4), respectively. The pair of connection electric paths LP of the third connection part CN (3) electrically connects the pair of fourth pins P4 of the first circuit board CB (1) and the pair of circuit pins CP of the fourth circuit board CB (4) in a direction different from the direction in which one connection part CN extends on the front surface side of the first circuit board CB.

The control unit CT transmits a fourth signal to the electrical circuit EC of the fourth circuit board CB(4) via a pair of third pins P3 of the third connector C3 of the first circuit board CB(1), another pair of board electrical paths EPR, a pair of fourth pins P4 of the fourth connector C4, and a circuit pin CP of the fourth circuit board CB(4).

According to the backlight BL described above, the fourth circuit board CB(4) is connected to the first circuit board (1) in a different direction from the second circuit board CB(2) connected to the first connector C1 and the second connector C2 using the third connector C3 and the fourth connector C4. This allows for an increased variety of shapes for the backlight BL.

In this embodiment, the third connector C3 and the fourth connector C4 are provided on the back surface of the substrate B, but they may be provided on the front surface of the substrate B, similar to the first connector C1 and the second connector C2.

B Board BL Backlight C1 First connector C2 Second connector C3 Third connector C4 Fourth connector CB Circuit board CB(1) First circuit board CB(2) Second circuit board CB(3) Third circuit board CB(4) Fourth circuit board CN Connection portion CN(1) First connection portion CN(2) Second connection portion CN(3) Third connection portion CP Pair of circuit pins CT Control portion EP Pair of board electric paths EPa Another pair of board electric paths EPR Yet another pair of board electric paths EC Electric circuit L Light-emitting element LP Pair of connecting electric paths LPa Another pair of connecting electric paths P1 Pair of first pins P2 Pair of second pins P1a Another pair of first pins P2a Another pair of second pins P3 Pair of third pins P4 Pair of fourth pins

Claims (14)

A substrate having an electric circuit provided thereon;
a first connector including a pair of circuit pins connected to the electrical circuit and a pair of first pins isolated from the electrical circuit;
a second connector including a pair of second pins;
A pair of circuit board paths connecting the pair of first pins and the pair of second pins,
Circuit board. the first connector further includes another pair of first pins;
the second connector further includes another pair of second pins;
Further comprising another pair of substrate wiring paths connecting the other pair of first pins and the other pair of second pins.
The circuit board according to claim 1 . each of the first connector and the second connector has a shape extending along a longitudinal direction of the substrate;
the first connector and the second connector are disposed on the substrate so as to face each other,
The pair of board electrical paths are provided between the first connector and the second connector.
The circuit board according to claim 1 or 2. a third connector including a pair of third pins separated from the electrical circuit;
a fourth connector including a pair of fourth pins;
and a further pair of substrate wiring paths connecting the pair of third pins and the pair of fourth pins.
The circuit board according to any one of claims 1 to 3. A first circuit board;
A second circuit board;
a first connection portion that can be connected to the first circuit board and the second circuit board;
Each of the first circuit board and the second circuit board includes:
A substrate having an electric circuit provided thereon;
a first connector including a pair of circuit pins connected to the electrical circuit and a pair of first pins isolated from the electrical circuit;
a second connector including a pair of second pins;
a pair of substrate wiring paths connecting the pair of first pins and the pair of second pins;
the first connection portion includes a pair of connection paths that can electrically connect the pair of second pins of the first circuit board and the pair of circuit pins of the second circuit board;
A set of electrical equipment assembly parts. The first connection portion may be connected to the first circuit board and the second circuit board so as to cross a longitudinal direction of the boards.
6. A set of electrical device components according to claim 5. the first connector further includes another pair of first pins;
the second connector further includes another pair of second pins;
each of the first circuit board and the second circuit board further includes another pair of board traces connecting the other pair of first pins and the other pair of second pins;
the first connection portion further includes another pair of connection paths capable of connecting the other pair of second pins of the first circuit board and the other pair of first pins of the second circuit board;
7. A set of electrical device components according to claim 6. a third circuit board including the same board as each of the first circuit board and the second circuit board, the first connector, the second connector, and the pair of board electrical paths;
A second connection portion including the pair of connection electric paths identical to the first connection portion;
Further equipped with
Each of the first connection portion and the second connection portion further includes another pair of connection paths,
the other pair of connection electric paths of the second connection portion can be connected to the other pair of second pins of the second circuit board,
The other pair of second pins of the second circuit board may be electrically connected to the other pair of circuit pins of the third circuit board via the other pair of connection electric paths of the second connection portion.
A set of parts for assembling an electrical device according to claim 7. a fourth circuit board including the same board as each of the first circuit board and the second circuit board, the first connector, the second connector, and the pair of board electrical paths;
a third connection portion including the pair of connection electric paths identical to the first connection portion;
Further equipped with
The first circuit board, the second circuit board, and the fourth circuit board each include
a third connector further including a pair of third pins separated from the electrical circuit;
a fourth connector including a pair of fourth pins;
and a further pair of substrate wiring paths connecting the pair of third pins and the pair of fourth pins,
the third connection portion may electrically connect the pair of fourth pins of the first circuit board and the circuit pins of the fourth circuit board;
A set of parts for assembling an electric device according to any one of claims 5 to 8. A first circuit board;
A second circuit board;
a first connection portion connected to the first circuit board and the second circuit board;
a control unit that controls the first circuit board and the second circuit board,
Each of the first circuit board and the second circuit board includes:
A substrate having an electric circuit provided thereon;
a first connector including a pair of circuit pins connected to the electrical circuit and a pair of first pins isolated from the electrical circuit;
a second connector including a pair of second pins;
a pair of substrate wiring paths connecting the pair of first pins and the pair of second pins;
the first connection portion includes a pair of connection paths that electrically connect the pair of second pins of the first circuit board and the pair of circuit pins of the second circuit board,
The control unit is
Transmitting a first signal via the pair of circuit pins of the first circuit board to control the electrical circuit of the first circuit board;
a second signal for controlling the electric circuit of the second circuit board is transmitted via the pair of first pins, the pair of board electric paths, and the pair of second pins of the first circuit board, and the pair of circuit pins of the second circuit board;
Electrical equipment. The electrical device according to claim 10, wherein the pair of substrate electrical paths and the pair of connecting electrical paths are arranged transversely to the longitudinal direction of the substrate. a third circuit board including the same board as each of the first circuit board and the second circuit board, the first connector, the second connector, and the pair of board electrical paths;
A second connection portion including the pair of connection electric paths identical to the first connection portion;
Further equipped with
Each of the first connection portion and the second connection portion further includes another pair of connection paths,
the other pair of connection electric paths of the second connection portion are connected to the other pair of second pins of the second circuit board;
the other pair of second pins of the second circuit board are electrically connected to the other pair of circuit pins of the third circuit board via the other pair of connection electric paths of the second connection portion;
the control unit transmits a third signal to the electric circuit of the third circuit board via the other pair of first pins, the other pair of board electric paths, and the other pair of second pins of the first circuit board, the other pair of connecting electric paths of the first connection portion, the pair of first pins, the pair of board electric paths, and the pair of second pins of the second circuit board, the pair of connecting electric paths of the second connection portion, and the circuit pin of the third circuit board.
12. An electrical device according to claim 10 or 11. a fourth circuit board including the same board as each of the first circuit board and the second circuit board, the first connector, the second connector, and the pair of board electrical paths;
a third connection portion including the pair of connection electric paths identical to the first connection portion;
Further equipped with
The first circuit board, the second circuit board, and the fourth circuit board each include
a third connector further including a pair of third pins separated from the electrical circuit;
a fourth connector including a pair of fourth pins;
and a further pair of substrate wiring paths connecting the pair of third pins and the pair of fourth pins,
the third connection portion electrically connects the pair of fourth pins of the first circuit board and the circuit pins of the fourth circuit board;
the control unit transmits a fourth signal to the electric circuit of the fourth circuit board via the pair of third pins of the first circuit board, the further pair of board electric paths, and the pair of fourth pins, and the circuit pin of the fourth circuit board;
An electrical device according to any one of claims 10 to 12. the electrical circuit includes a plurality of light emitting elements;
An electrical device according to any one of claims 10 to 13, which functions as a backlight for a liquid crystal display device.

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