JP2007134357A - Electrical connection structure of wiring board, and liquid crystal module and display having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical connection structure of a wiring board that can save space or can be stored, and to provide a liquid crystal module and a display having the electrical connection structure of the wiring board. <P>SOLUTION: A plurality of printed-wiring boards 41, 42 for distributing an electric signal and/or power to a plurality of TCPs 31 with a driver 311 for driving a liquid crystal display panel 2 packaged therein are electrically connected by a first FPC 51 and a second FPC 52 that are arranged while being superposed at least partially. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrical connection structure of a wiring board, a liquid crystal module including the electrical connection structure of the wiring board, and a display device, and is particularly suitable for electrical connection of a wiring board that transmits an electrical signal or the like to a liquid crystal display panel. The present invention relates to an electrical connection structure of a wiring board, a liquid crystal module including the electrical connection structure of the wiring board, and a display device.

  A general liquid crystal display panel is mounted with a circuit board or wiring board on which a driver IC for driving the liquid crystal display panel is mounted, and is incorporated in a display device together with a control circuit board for controlling the driver IC or the like. Used.

  FIG. 7 is an external perspective view showing an example of a conventional configuration of an assembly in which various circuit boards and wiring boards are mounted on a liquid crystal display panel. The assembly 9 shown in FIG. 7 includes a liquid crystal display panel 91, a plurality of TCP (Tape Carrier Packages) 92 and 93 on which a driver IC for driving the liquid crystal display panel 91 is mounted, and the TCPs 92 and 93. And a printed wiring board 94 for transmitting various electrical signals and supplying power to the liquid crystal display panel 91. The assembly 9 has a configuration in which the TCPs 92 and 93 are mounted at predetermined positions on the peripheral edge of the liquid crystal display panel 91, and each TCP 92 is connected to the printed wiring board 94.

  The printed wiring board 94 is formed in an elongated shape, for example, a rectangular shape. And it arrange | positions so that the peripheral part of the liquid crystal display panel 91 may be followed. A plurality of electrical wirings are provided in parallel along the longitudinal direction on the surface or inner layer. A plurality of TCPs 92 are attached to one printed wiring board 94, and a predetermined electrical signal and power can be distributed to each attached TCP 92.

  The longitudinal dimension of the printed wiring board 94 is set according to the size of the liquid crystal display panel 91. Therefore, the size of the printed wiring board 94 in the longitudinal direction needs to be increased as the liquid crystal display panel 91 is increased in size. However, such a printed wiring board 94 may have a predetermined maximum size that can be manufactured in advance. For this reason, it may be difficult to manufacture a large-sized printed wiring board 94 that exceeds the defined dimensions, or the manufacturing cost may increase significantly.

  Further, when the longitudinal dimension of the printed wiring board 94 is increased, it may be difficult to ensure the alignment accuracy of the mounting position with each TCP 92. That is, as the longitudinal dimension of the printed wiring board 92 increases, the amount of deformation due to temperature changes also increases. Therefore, in aligning the connection position of the printed wiring board 94 and each TCP 92, it is difficult to mount each TCP 92 at a predetermined position with a predetermined accuracy.

  For this reason, when the size of the liquid crystal display panel 91 is large, a plurality of printed wiring boards 94 are used, and the electrical wiring provided on each printed wiring board 94 is connected to an FPC (Flexible Print Circuit) 95 or FFC (Flexible A configuration of electrical connection using a flat cable is used. According to such a configuration, since it is not necessary to increase the longitudinal dimension of the printed wiring board 94, an increase in the manufacturing cost of the printed wiring board 94 can be suppressed, and the alignment accuracy of the mounting position of each TCP 92 can be ensured. Is also easier.

JP-A-4-295684 Japanese Patent Laid-Open No. 2002-9673

  However, when the electrical wiring provided on such a printed circuit board is electrically connected using FPC, FFC, or the like, the following problems occur.

  As described above, the printed wiring board is provided with a large number of electric wirings on the surface and the inner layer. For this reason, FPC and FFC which connect these electric wirings, or the connector for connecting a printed wiring board with FPC, FFC, etc. enlarges. In particular, if the printed wiring board has a multi-layer structure, and electrical wiring is provided in each layer, the lateral width dimensions of the FPC, FFC, and connector that connect these electrical wirings are the lateral width dimensions of the printed wiring board. It may become larger than.

  When such an assembly is incorporated in a display device or the like, the FPC or FFC protrudes from a space for storing a printed wiring board provided in the display device. For this reason, for example, it is necessary to separately fix and store the FPC and FFC such as folding or fixing the FPC and FFC and storing the FPC and FFC in the storage space of the printed wiring board. As described above, it takes time to assemble the display device. Further, the protruding FPC, FFC, or the like may interfere with other work.

  In view of the above circumstances, the problem to be solved by the present invention is to provide an electrical connection structure of a wiring board that is space-saving or easy to store, a liquid crystal module including the electrical connection structure of the wiring board, and a display device. An object of the present invention is to provide an electrical connection structure for a wiring board that can save labor in the assembly process of the apparatus and the like, a liquid crystal module including the electrical connection structure for the wiring board, and a display device.

  In order to solve the above problems, an electrical connection structure for a wiring board according to the present invention includes a plurality of wiring boards on which electrical wiring is provided and at least a part of the wiring boards overlapping each other to electrically connect the plurality of boards. And a plurality of electrical connection means for connection.

  Here, it is preferable that the connector portion to which the electrical connection means and the wiring board are coupled is provided in the vicinity of the sides facing each other of the plurality of boards and in close proximity to each other.

  For the electrical connection means, FPC (Flexible Print Circuit) and / or FFC (Flexible Flat Cable) can be applied.

  The liquid crystal module according to the present invention includes a liquid crystal display panel, a plurality of circuit boards on which drivers for driving the liquid crystal display panel are mounted, and a plurality of wirings that distribute electric signals and / or power to the plurality of circuit boards. And a plurality of wiring boards connected by an electrical connection structure of the wiring boards.

  The gist of the display device according to the present invention is that it includes the liquid crystal module.

  By using a plurality of electrical connection means for electrically connecting the wiring boards and arranging them at least partially overlapping each other, it is possible to reduce the size of the connection structure between the wiring boards. By downsizing, the connection structure can be easily stored in a predetermined space, for example, a wiring board. In addition, since it is not necessary to fold or fix these electrical connection means for storage, labor saving can be achieved.

  In a display device including such a liquid crystal module, a plurality of electrical connection means for connecting the printed wiring boards are accommodated without protruding from the space for accommodating the printed wiring boards. And when storing these electrical connection means, it is not necessary to bend or fix. For this reason, the labor of the assembly process of the display device can be reduced, and the electrical connection means can be prevented from becoming an obstacle to other work.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic plan view illustrating a configuration of a liquid crystal module including an electrical connection structure for a wiring board according to an embodiment of the present invention. In this specification, the “liquid crystal module” means an assembly in which a circuit board or a wiring board for driving the liquid crystal display panel is mounted on the liquid crystal display panel.

  As shown in FIG. 1, a liquid crystal module 1 having an electrical connection structure of a wiring board according to an embodiment of the present invention includes a liquid crystal display panel 2, a plurality of TCP (Tape Carrier Packages) 31, 32, and a plurality of printed wiring boards. 41, 42. The liquid crystal module according to the present embodiment includes two printed wiring boards.

  As the liquid crystal display panel 2 of the present liquid crystal module, various known liquid crystal display panels such as a conventional active matrix type liquid crystal display panel can be applied. Therefore, description of the structure and operation of the liquid crystal display panel is omitted.

  A plurality of TCPs 31 and 32 are respectively mounted at predetermined positions on one of the opposing long sides and one of the opposing short sides of the liquid crystal display panel 2. A source driver 311 for driving a source bus line of the liquid crystal display panel 2 is mounted on each TCP 31 mounted on the long side of the liquid crystal display panel 2. On the other hand, the TCP 32 mounted on the short side of the liquid crystal display panel 2 is mounted with a gate driver 321 for driving the gate bus line of the liquid crystal display panel.

  Further, printed wiring boards 41 and 42 are further attached to each TCP 31 attached to the long side of the liquid crystal display panel 2. As shown in FIG. 1, these printed wiring boards 41 and 42 are formed in an elongated shape such as a rectangle. A plurality of electric wirings for transmitting various electric signals and supplying electric power are provided in parallel along the longitudinal direction on the surfaces and inner layers of these printed wiring boards 41 and 42.

  One printed wiring board 41 is connected to a predetermined external circuit board, for example, a control circuit board for controlling the liquid crystal module, and the electrical wiring provided on the printed wiring board 41 transmits various electric signals from the outside. Can receive power supply. The printed wiring boards 41 and 42 are electrically connected to each other, and the electrical wiring of the other printed wiring board 42 is transmitted through the one printed wiring board 41 and various electric signals are supplied. Can receive. The configuration of electrical connection between the printed wiring boards 41 and 42 will be described later.

  These electric wirings include source signal wirings 411 and 421 for transmitting a signal for controlling the source driver 311 of each TCP 31, source driver power wirings 412 and 422 for supplying power to the source driver 311, and a common voltage for the liquid crystal display panel 2. Common voltage lines 413 and 423 for applying voltage, gate signal wirings 414 and 424 for transmitting a signal for controlling the gate driver 321 of each TCP 32, gate driver power wirings 415 and 425 for supplying power to the gate driver 321, and liquid crystal display panels The auxiliary capacity supply lines 416 and 426 for supplying the auxiliary capacity to the auxiliary capacity bus line and their spare wiring (not shown) are included.

  The printed wiring boards 41 and 42 are configured to distribute the various signals, power, and common voltage to the TCPs 31 and the liquid crystal display panel 2 mounted on the printed wiring boards 41 and 42, respectively. Specific modes of distribution of electric signals and electric power are as follows.

  The printed wiring boards 41 and 42 are used for signals and operations for controlling the source driver 311 to the source drivers of the respective TCPs 31 mounted on the printed circuit boards 41 and 42 through the source signal wirings 411 and 421 and the source driver power wirings 412 and 422, respectively. To distribute the power. The source driver 311 of each TCP 31 drives the source bus line of the liquid crystal display panel 2 based on the distributed electrical signal. The printed wiring boards 41 and 42 apply a common voltage to the liquid crystal display panel 2 through the common voltage lines 413 and 423 and the TCPs 31.

  Further, the printed wiring board 42 has a gate driver 321 with respect to the gate driver 321 of each TCP 32 mounted on the short side of the liquid crystal display panel 2 through the gate signal wirings 414 and 424, the gate power lines 415 and 425, and a specific TCP. It is possible to supply electric signals and electric power for controlling the operation. Each gate driver 321 drives the gate bus line of the liquid crystal display panel 2 based on the distributed electrical signal. Similarly, an auxiliary capacity can be supplied to the auxiliary capacity bus line of the liquid crystal display panel 2 through the auxiliary capacity lines 416 and 426.

  The electric wirings provided on the printed wiring boards 41 and 42 are electrically connected to each other by an FPC installed between the printed wiring boards 41 and 42. In the present embodiment, each electrical wiring is electrically connected by two FPCs, a first FPC 51 and a second FPC 52. Source signal wirings 411 and 421 that transmit signals for controlling each source driver 311 and source driver power wirings 412 and 422 that supply power to each source driver 311 are connected by a first FPC 51. In addition, electrical wiring other than these is connected by the second FPC 52.

  FIG. 2 is a partial cross-sectional view schematically showing a connection portion between the printed wiring boards 41 and 42 extracted from the liquid crystal module 1.

  As shown in FIG. 2, each printed wiring board 41, 42 has a multilayer structure, and the electric wirings 411 to 416 are formed on the inner layer and one surface (the lower surface in FIG. 2). , 421 to 426 are provided. In the vicinity of opposite sides of the printed wiring boards 41 and 42, first FPC connectors 417 and 427 and second FPC connectors 418 and 428 are provided, respectively. Specifically, the first FPC connectors 417 and 427 and the second FPC connectors 418 and 428 are provided in parallel and close to opposite sides of the printed wiring boards 41 and 42. Various known FPC connectors can be applied to the first FPC connectors 417 and 427 and the second FPC connectors 418 and 428. Therefore, detailed description of these FPC connectors is omitted.

  The first FPC connectors 417 and 427 of each printed wiring board 41 and 42 are electrically connected by the first FPC 51, and the second FPC connectors 418 and 428 are connected by the second FPC 52. Thereby, the electric wirings 411 to 416 and 421 to 426 provided on the printed wiring boards 41 and 42 are electrically connected to each other.

  The first FPC 51 and the second FPC 52 are constructed so that at least a part of them overlap each other.

  According to such a configuration, when each printed wiring board 41, 42 is viewed from a direction perpendicular to the surface direction, the first FPC 51 and the second FPC 52 are arranged in the longitudinal direction of each printed wiring board 41, 42. , Or an extension line A thereof, does not protrude outward, or the protrusion can be reduced.

  For this reason, when a liquid crystal module having such an electrical connection structure of a wiring board is incorporated in a display device or the like, the first FPC 51 and the second FPC 52 do not protrude from the space in which the printed wiring boards 41 and 42 are stored. Can be stored. Therefore, it is not necessary to perform the operation of folding or fixing the FPCs 51 and 52 to accommodate them, and the FPCs 51 and 52 and the printed wiring boards 41 and 42 connected thereto are easily handled. Become.

  In addition, since the first FPC 51 and the second FPC 52 themselves can be small, the manufacturing cost of the liquid crystal module can be reduced.

  Next, a display device and a television receiver in which the present liquid crystal module is incorporated will be described.

  FIG. 3 is an exploded perspective view schematically showing a configuration of a display device in which the liquid crystal module according to the present embodiment is incorporated. For convenience of explanation, the upper side in FIG. 3 is referred to as “front side” of the display device, and the lower side is referred to as “back side”.

  The display device 7 includes a liquid crystal module 1, a chassis 71, a light source lamp 72, a reflection sheet 73, an optical sheet 74, a side holder 75, a frame 76, a bezel 77, a light source, and the like. A drive circuit board 78 and a control circuit board 79 are provided.

  Each of these members will be briefly described. The chassis 71 is a substantially quadrangular plate-like member, and is integrally formed by using, for example, a metal plate or the like by pressing.

  The light source lamp 72 may be a fluorescent tube such as a hot cathode tube or a cold cathode tube, an LED, other various light sources, or a combination thereof. FIG. 3 shows a configuration in which a plurality of fluorescent tubes formed linearly are applied.

  The reflection sheet 73 is a sheet-like or plate-like member that diffusely reflects light emitted from the light source lamp 72. The reflection sheet 73 is made of, for example, foamed PET (polyethylene terephthalate).

  Here, the optical sheets 74 refer to a plate-like or sheet-like member for adjusting the characteristics of light emitted from the light source lamp 72 or a set of these. Specifically, the optical sheets 74 include a diffusion plate, a lens sheet, a polarization reflection sheet, and the like. In general, these are used by being stacked.

  The side holder 75 is a substantially rod-shaped member that functions as a spacer or the like for placing the optical sheets 74. The side holder 75 is integrally formed of, for example, a resin material.

  The frame 76 is a member for holding members such as the light source lamp 72 and the optical sheets 74 on the chassis 71. The bezel 77 is a member having a function of holding the liquid crystal module 1 or the like on the frame 76. The frame 76 and the bezel 77 are formed, for example, in a substantially quadrilateral shape that is opened by pressing or the like using a metal plate material or the like.

  The light source driving circuit board 78 is a circuit board on which an electronic circuit and an electric circuit for driving the light source lamp 72 are constructed. The control circuit board 79 is a circuit board that generates various signals for controlling the liquid crystal display panel.

  In addition, since these members 71-79 except the liquid crystal module 1 can apply a conventionally general member, detailed description is abbreviate | omitted.

  The assembly of the display device 7 having such a member is as follows. A reflection sheet 73 is laid on the front side of the chassis 71, and a light source lamp 72 is arranged on the front side. In this state, the side holder 75 is attached to the peripheral edge of the short side of the chassis 71. An optical sheet 74 is disposed on the front side of the chassis 71 and the side holder 75, and a frame 76 is mounted on the front side.

  The liquid crystal module 1 is disposed on the front side of the frame 76. A bezel 77 is mounted on the front side.

  On the other hand, a light source driving circuit board 78 and a control circuit board 79 are mounted on the rear side of the chassis 71, and a light source driving circuit board cover 781 and a control circuit board cover 791 are mounted so as to cover the circuit boards 78 and 79. Is done.

  FIG. 4 is an exploded perspective view showing an example of the configuration of the television receiver in which the liquid crystal module according to the embodiment is incorporated. The television receiver 8 includes a display device 7, a tuner substrate 81, a loudspeaker 82, a power supply substrate 83, a cabinet 84, and a support base 85.

  The tuner board 81 generates a video signal and an audio signal of a predetermined channel based on the received radio wave or a signal input from the outside. For the tuner substrate 81, a conventional general terrestrial (analog or digital or both) tuner, BS tuner, CS tuner, or the like can be applied.

  The loudspeaker 82 emits a sound based on the sound signal generated by the tuner board 81. As this loudspeaker 82, a conventional general loudspeaker such as a general speaker can be applied.

  The display device 7 displays a video based on the video signal generated by the tuner substrate 81. A display device incorporating the liquid crystal module according to the present embodiment is applied to the display device 7. The power supply board 83 supplies power to the tuner board 81, the loudspeaker 82, and the display device 7.

  As shown in FIG. 4, the display device 7, the tuner board 81, the loudspeaker 82, and the power supply board 83 are housed in a cabinet 84 and supported by a support base 85. In FIG. 4, the cabinet 84 has a configuration including a front cabinet 841 and a back cabinet 842.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the embodiments, and various modifications can be made without departing from the spirit of the present invention. Needless to say.

  Here, the modification of the electrical connection structure of the wiring board which concerns on embodiment of this invention is shown.

  FIG. 5 is an external perspective view showing a first modification, and corresponds to FIG. 2 of the embodiment. In the first modification, the first FPC connectors 417 ′ and 427 ′ and the second FPC connectors 418 ′ and 428 ′ are arranged in the vicinity of the sides facing each other of the printed wiring boards 41 and 42, respectively. Arranged in series along the direction edge.

  The first FPC connectors 417 'and 427' are electrically connected to the second FPC connectors 418 'and 428' by the first FPC 51 'and the second FPC 52', respectively.

  The first FPC 51 ′ and the second FPC 52 ′ have a shape in which the vicinity of both ends is bent at a substantially right angle in the same direction. Each of the first FPC 51 ′ and the second FPC 52 ′ is at least partially so as not to protrude from the longitudinal side of each printed wiring board or its extension line A, or to reduce the amount of protrusion. Are superposed on each other.

  FIG. 6 is an external perspective view showing a second modification, and corresponds to FIG. 2 of the embodiment. In the second modified example, the first connectors 417 ″ and 427 ″ are provided in the vicinity of the opposite sides of the printed wiring boards 41 and 42 and substantially parallel to the sides. The second FPC connectors 418 ″ and 428 ″ are provided in the vicinity of opposite sides of the printed wiring boards 41 and 42 and substantially parallel to the longitudinal side.

  The first FPC connectors 417 "and 427" and the second FPC connectors 418 "and 428" are electrically connected to each other by the first FPC 51 "and the second FPC 52", respectively. The first FPC 51 ″ has a simple linear shape as in the above-described embodiment, and the second FPC 52 ″ has a shape in which the vicinity of both ends bends substantially at right angles toward the same direction. Each of the first FPC 51 ″ and the second FPC 52 ″ is at least partly so as not to protrude from the longitudinal side of each printed wiring board or its extension line A, or to reduce the amount of protrusion. Are superposed on each other.

  Also according to these first or second modifications, the same operational effects as those of the above-described embodiment can be obtained.

  In the above-described embodiment and each modified example, an example in which electrical connection is configured by two FPCs has been shown. However, the number of FPCs is not limited to two, but three or more. There may be. When three or more FPCs are used for electrical connection, each FPC connector for connecting each FPC to each printed wiring is opposite to each other on each printed wiring board as in the above embodiment. Any configuration may be used provided that it is provided in the vicinity of the side in parallel with the side, or provided in the vicinity of the opposite side of each printed wiring board along the side in the longitudinal direction.

  Moreover, in the said embodiment and each modification, although each FPC connector showed the structure provided in the surface of the same side of a printed wiring board, the structure provided in the surface of the both sides of a printed wiring board may be sufficient.

  In short, each electrical wiring is electrically connected to each printed wiring board using a plurality of FPCs so that these FPCs do not protrude from the longitudinal sides of each printed wiring board or their extension lines. Alternatively, any structure may be used as long as the protrusion is reduced. For this purpose, each FPC may be constructed so that at least a part of each FPC overlaps each other.

  Moreover, in the said embodiment, although the structure which uses FPC as an electrical connection means of the various electric wirings provided in each printed wiring board was shown, you may use FFC and also use FPC and FFC together. Also good. In this case, “FPC” can be read as “FFC” or “FPC or FFC”, and “FPC connector” can be read as “FFC connector” or “FPC connector or FFC connector” in the description of the embodiment and each modification. That's fine. Various known FFC and FFC connectors can be applied to these FFC and FFC connectors. Even if the FFC is used as the electrical connection means and the FFC connector is provided on the printed wiring board, the same effects as those of the above-described embodiment can be achieved.

  Further, the connection between each FPC and each printed wiring board is not limited to the configuration using the FPC connector as in the above embodiment. In short, as long as the FPC and the electric wiring provided on each printed wiring board can be electrically connected, the method and the members used are not limited. For example, soldering may be used.

It is the plane schematic diagram which showed the structure of the liquid crystal module provided with the electrical connection structure of the wiring board which concerns on embodiment of this invention. It is the external appearance perspective view which extracted and showed the electrical connection structure of the wiring board which concerns on embodiment of this invention. It is the disassembled perspective view which showed typically the structure of the display apparatus incorporating the liquid crystal module provided with the electrical connection structure of the wiring board which concerns on embodiment of this invention. It is the disassembled perspective view which showed typically the structure of the television receiver in which the said liquid crystal module was integrated. It is the external appearance perspective view which showed the 1st modification of the electrical connection structure of the wiring board which concerns on embodiment of this invention. It is the external appearance perspective view which showed the 2nd modification of the electrical connection structure of the wiring board which concerns on embodiment of this invention. It is the external appearance perspective view which showed an example of the structure of the assembly of the conventional liquid crystal display panel, various circuit boards, and a wiring board.

Explanation of symbols

1 Liquid crystal module 2 Liquid crystal display panel 31, 32 TCP
41, 42 Printed circuit board 51 First FPC
52 Second FPC
417, 427 First FPC connectors 418, 428 Second FPC connectors 411-416 Electrical wiring

Claims (5)

  A plurality of wiring boards on which electrical wiring is provided, and a plurality of electrical connection means that at least partially overlap each other and electrically connect the electrical wirings provided on the plurality of boards. An electrical connection structure of a wiring board characterized by   2. The connector part to which the electrical connection means and the wiring board are coupled is provided in the vicinity of the mutually opposing sides of the plurality of wiring boards and in close proximity to each other. Electrical connection structure of the described wiring board.   3. The wiring board electrical connection structure according to claim 1, wherein the electrical connection means is FPC and / or FFC.   A plurality of circuit boards on which a liquid crystal display panel, a driver for driving the liquid crystal display panel are mounted, and a plurality of wiring boards that distribute electric signals and / or power to the plurality of circuit boards. 4. A liquid crystal module, wherein electrical wirings provided on the wiring board are electrically connected by the electrical connection structure of the wiring board according to claim 1. A display device comprising the liquid crystal module according to claim 4.

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