JP2012182409A - Flexible wiring board, and drive circuit structure of electro-optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible wiring board capable of adjusting the length at the time of electrical connection and being positioned at a suitable position with respective to a connector and the like, and a drive circuit structure of an electro-optical device.SOLUTION: A flexible wiring board 50 includes: an insulating base material 1 having flexibility; a plurality of wiring lines 10 extending in a longitudinal direction of the base material 1; a first connection land group TG1 and a second connection land group TG2 formed of connection lands and provided either end side of the plurality of the wiring lines 10; a third connection land group TG3 provided between the first connection land group TG1 and the second connection land group TG2 in a longitudinal direction of the wiring lines 10; and pairs of cutout portions C1, C2, C3, C4 provided as outline references, each of the pairs being provided on each end side of the base material 1 in a short side direction corresponding to the first to the third connection land groups TG1, TG2, TG3.

Description

  The present invention relates to a flexible wiring board and a drive circuit structure for an electro-optical device including the flexible wiring board.

  Flexible printed circuit boards (FPCs) are obtained by patterning a base material made of, for example, a polyimide resin having both flexibility and insulation, and a copper foil bonded on the base material. It is often used to electrically connect an electro-optical device such as a liquid crystal device or an organic EL device and an external drive circuit.

On the other hand, in order to electrically connect the external drive circuit and the electro-optical device, an FPC that conforms to the specifications of the electro-optical device is required. Therefore, as the types of electro-optical devices increase, the types of FPC increase. There was a problem.
For example, Patent Document 1 discloses a connector for connection that can connect an FPC and an electric wire.
The connecting connector has a plurality of bus bars each having an electric wire connected to the base end and having a claw portion on the distal end side, and the claw portions of the plurality of bus bars have the same dimensions as the interval between the conductor portions of the FPC. It is provided in the main body part in a state shifted to. The FPC is sandwiched and fixed between the main body portion and the cover portion in a state where each claw portion is pierced into each conductor portion.
That is, it is possible to electrically connect to the electric wire via the connector for connection at an arbitrary position of the FPC, and the degree of freedom in the length direction of the FPC is improved. For example, the length of the FPC is changed according to the specifications of the electro-optical device. The need is avoided.

JP 2001-118621 A

However, although the length of the FPC can be arbitrarily adjusted by using the connection connector disclosed in Patent Document 1, the conductor portion of the FPC is scratched by the claw portion. For example, if the connector is repeatedly attached and detached, stress is applied to the FPC and the wound is damaged. May cause problems such as tearing of the FPC.
Further, when the interval (pitch) between the conductor portions of the FPC is narrowed, there is a problem that it is difficult to accurately position with respect to the bus bar claw portion.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A flexible wiring board according to this application example includes a flexible insulating base material, a plurality of wirings extending in a longitudinal direction of the base material, and the longitudinal direction of the plurality of wirings. A first connection land group and a second connection land group each formed of connection lands provided on both ends, and the first connection land group and the second connection land in the longitudinal direction of the plurality of wirings. A third connection land group provided between the group and a pair of external reference provided at least corresponding to the third connection land group on both ends in the short direction of the substrate. It is characterized by that.

According to this configuration, for example, when the flexible wiring board is electrically connected to the circuit board, the second connection land group provided at the end in the longitudinal direction on the basis of the first connection land group, A connection can be made by selecting any one of the third connection land groups provided between the two connection land groups. Therefore, compared with the case where a flexible wiring board is prepared corresponding to a desired length, one flexible wiring board can be shared, inventory management and the like are simplified, and the cost can be reduced.
In addition, since a pair of outer shape references are provided corresponding to at least the third connection land group, when the third connection land group is used, for example, an unnecessary connection land group is used using the pair of outer shape references. Can be cut and deleted to ensure a secure connection.

Application Example 2 In the flexible wiring board of the application example described above, the pair of outer shape references is a cutout portion formed by cutting out the base material.
According to this, for example, positioning to a connection member such as a connector using a notch portion, or cutting over a pair of notch portions to delete unnecessary connection land groups, a desired connection Only the land group can be left.

Application Example 3 In the flexible printed circuit board according to the application example described above, the pair of external reference is provided for each of the first connection land group, the second connection land group, and the third connection land group. It is preferable.
According to this, it is possible to select two of the first to third connection land groups and position them on a connection member such as a connector while adjusting the length in the longitudinal direction to achieve electrical connection. it can.

  Application Example 4 The drive circuit structure of the electro-optical device according to this application example includes the flexible wiring board according to the application example described above and the drive circuit of the electro-optical device. The drive circuit and the flexible wiring board are electrically connected to each other. And a second connector for electrically connecting the electro-optical device and the flexible wiring board.

According to this configuration, for example, when the electro-optical device is driven by connecting the flexible wiring board to the first connector and the second connector, the length of the flexible wiring board can be adjusted according to the operating environment state. An optical device drive circuit structure can be provided.
In other words, even if you want to change the length of the flexible wiring board that connects the electro-optical device and the drive circuit according to the operating environment, it can be handled with one flexible wiring board, and between different types of electro-optical devices Can share the drive circuit structure.

Application Example 5 Another electro-optical device drive circuit structure according to this application example includes the flexible wiring board according to the application example described above, and the drive circuit of the electro-optical device mounted thereon. A first board having a first connector to be electrically connected; and a second connector to electrically connect the electro-optical device and the flexible wiring board, wherein the first connector and the second connector are: Each of the flexible wiring boards has a positioning reference with respect to the pair of external references.
According to this configuration, the length of the flexible wiring board can be adjusted according to the operating environment, and can be reliably connected to the first connector and the second connector using a pair of external reference of the flexible wiring board. A driving circuit structure for an electro-optical device can be provided.

Application Example 6 In the drive circuit structure of the electro-optical device according to the application example described above, the pair of outer shape references of the flexible wiring board are notched portions in which the base material is cut, and the first and second The positioning reference of the connector is a protrusion that fits into the notch.
According to this, even if the arrangement pitch of the connection lands becomes fine, the protrusions of the first and second connectors are fitted into the cutout portions of the flexible wiring board having a desired length and positioned, so that the flexible wiring The board and the first and second connectors can be reliably connected.

Application Example 7 In the drive circuit structure of the electro-optical device according to the application example, the driving circuit structure includes a second substrate on which the second connector is mounted, and the second substrate is connected to the second connector via a wiring. The electro-optical device may include a third connector that is electrically connected.
According to this, the third connector according to the number of terminals and the terminal arrangement of the relay board connected to the electro-optical device side is provided on the second board, and the electro-optical device is flexibly wired via the third connector and the second connector. It can be connected to a substrate. That is, since it is not necessary to directly connect the relay substrate of the electro-optical device and the flexible wiring substrate by the second connector, the structure of the second connector can be simplified. In addition, the drive circuit structure can be shared with more electro-optical devices having different terminal specifications.

(A) is a schematic plan view which shows the structure of a flexible wiring board, (b) is a schematic sectional drawing. FIG. 3 is a schematic perspective view illustrating a configuration of a drive structure of an electro-optical device. (A) is a schematic plan view which shows the state by which the flexible wiring board was connected to the connector, (b) is a schematic sectional drawing. FIG. 4A is a schematic plan view illustrating a configuration of a liquid crystal light valve as an example of an electro-optical device, and FIG. 5B is a schematic plan view illustrating a configuration of an electroviewfinder as another example of the electro-optical device. Schematic which shows the operating environment of the projection type display apparatus using a liquid crystal light valve. Schematic which shows the operating environment of an electro viewfinder. The schematic plan view which shows the structure of FPC of the modification 1. FIG. FIG. 9 is a schematic plan view showing a configuration of an FPC according to Modification 2.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. Note that the drawings to be used are appropriately enlarged or reduced so that the part to be described can be recognized.

  In addition, in the following forms, for example, when “on the base material” is described, when placed on the base material, or when placed on the base material via another component Or it shall be arranged so that a part will touch on a substrate, and a part shall be arranged via other constituents.

<Flexible wiring board>
First, the flexible wiring board of this embodiment will be described with reference to FIG. FIG. 1A is a schematic plan view showing the configuration of the flexible wiring board, and FIG. 1B is a schematic cross-sectional view.
As shown in FIGS. 1A and 1B, a flexible wiring board 50 (hereinafter referred to as FPC 50) of the present embodiment includes an insulating base material 1 having flexibility and flexibility. A plurality of wirings 10 provided at intervals on the material 1 and extending in the longitudinal direction of the base material 1, and a coverlay 2 partially laminated on the base material 1 in the longitudinal direction across the plurality of wirings 10 And have.

  The substrate 1 is, for example, a polyimide film having a thickness of 20 μm to 30 μm, and has flame retardancy in addition to flexibility and insulation.

The plurality of wirings 10 are obtained by patterning a rolled copper foil laminated on the base material 1 into a desired shape. The thickness of the copper foil is about 35 μm, for example. The plurality of wirings 10 include a first connection land group TG1 including connection lands 11 provided on one end side in the longitudinal direction and connection lands provided on the other end side in the longitudinal direction. 12 and a third connection land 13 including a connection land 13 provided between the first connection land group TG1 and the second connection land group TG2 in the longitudinal direction. And a group TG3.
Each connection land group TG1, TG2, and TG3 is subjected to gold (Au) plating treatment with Ni as a base in order to make the contact resistance smaller than that of the copper foil. For example, the underlying Ni plating thickness is 1 μm, and the Au plating thickness is 0.1 μm.

  The connection lands 11, 12, and 13 provided for each wiring 10 are shifted in the longitudinal direction between the adjacent wirings 10 and arranged in front and rear (staggered). As a result, even if the connection lands 11, 12, and 13 are provided wider than the wiring 10, they are not short-circuited with each other, and an electrically stable connection is secured by securing a contact area in connection with a connector described later. It is the structure which can aim at.

The first connection land group TG1 is provided within a range of a length L1 from one end of the base 1. The second connection land group TG2 is provided within a range of a length L5 from the other end of the substrate 1.
On the other hand, the third connection land group TG3 provided inside the second connection land group TG2 has a length L3 from a position obtained by adding the length L2 to the length L1 from one end of the substrate 1. It is provided in the range. The length L1, the length L3, and the length L5 are the same.

  The position of the third connection land group TG3 in the longitudinal direction on the substrate 1 of the present embodiment can be arbitrarily set. That is, the length L2 between the first connection land group TG1 and the third connection land group TG3 and the length L4 from the other end of the substrate 1 to the third connection land group TG3 are arbitrarily set. can do. In this case, the length L2 is set to be the longest.

  In addition, at the ends of the length L1 and the length L2 in the longitudinal direction from one end of the substrate 1, and at both ends in the short direction of the positions L4 and L5 from the other end of the substrate 1, A pair of cutout portions C1, C2, C3, and C4 in which the base material 1 is cut out in a semicircular shape are provided. The pair of notches C1, C2, C3, and C4 correspond to the first connection land group TG1, the second connection land group TG2, and the third connection land group TG3, and can be separated from each other. It is provided as a standard.

  The cover lay 2 can use, for example, the same polyimide film as that of the base material 1 and is adhered between the first connection land group TG1 and the third connection land group TG3 of the base material 1 with an adhesive. Yes. The coverlay 2 is used for the purpose of reinforcing the plurality of wirings 10 so as not to be broken against repeated bending of the FPC 50. In addition to covering the portions where the plurality of wirings 10 are exposed in addition to the first to third connection land groups TG1, TG2, and TG3, the insulation between the wirings 10 is lost due to, for example, scratches or condensation. The plurality of wirings 10 are protected so as not to be interrupted. In order to play the role of such protection, it is desirable to use a film material such as the coverlay 2, but an insulating resin (resist) may be applied to protect the film. Further, it is not always necessary to provide the coverlay 2 or the like that plays the role of such protection.

  In the present embodiment, the planar shape of each of the connection lands 11, 12, and 13 is substantially rectangular, but the present invention is not limited to this. For example, the shape of one connection land arranged in a staggered pattern may be formed longer in the longitudinal direction than the other connection land. In other words, it is desirable to have a shape corresponding to the shape of the connecting portion in the connector described later.

According to the FPC 50 of this embodiment, either the second connection land group TG2 or the third connection land group TG3 in the longitudinal direction is selected and connected to the connector on the basis of the first connection land group TG1. Can do. That is, the connection which changed the length at the time of connection by one FPC50 is possible. For example, when the third connection land group TG3 is used, the unnecessary second connection land group TG2 is removed by cutting across the pair of cutout portions C3.
In other words, it is not necessary to prepare FPCs individually designed according to the length at the time of connection, and various lengths at the time of connection can be realized using one FPC 50. Therefore, by sharing it as a part, it is possible to reduce the labor of inventory management and the cost.

<Drive circuit structure of electro-optical device>
Next, the drive structure of the electro-optical device according to the present embodiment will be described with reference to FIGS. FIG. 2 is a schematic perspective view showing the configuration of the drive structure of the electro-optical device.

  As shown in FIG. 2, an operation unit (OPU) 100 as a drive structure of an electro-optical device according to this embodiment includes a drive circuit 102 for the electro-optical device, a power supply circuit 103 that supplies power to the drive circuit, and the like. The first substrate 101, the second substrate 110 to which the electro-optical device is connected, and a flexible wiring substrate (FPC) 50 for electrical connection between the first substrate 101 and the second substrate 110 are provided. .

  The first substrate 101 is a rigid circuit substrate having, for example, glass epoxy as a base material. The first substrate 101 is provided with a first connector 104 that connects the drive circuit 102 and the FPC 50.

  The second substrate 110 is also a rigid circuit substrate having a base material such as glass epoxy. The second substrate 110 is provided with a second connector 111 that connects the FPC 50 and the second substrate 110, and a third connector 112 that connects the electro-optical device and the second substrate 110. In addition, wiring for electrically connecting the second connector 111 and the third connector 112 is provided. That is, the electro-optical device is electrically connected to the drive circuit 102 via the first connector 104, the FPC 50, the second connector 111, and the third connector 112. In this case, the structures of the first connector 104 and the second connector 111 are basically the same, but the third connector 112 is selected and used according to the connection terminal specifications of the relay board on the electro-optical device side. .

  FIG. 3A is a schematic plan view showing a state where the flexible wiring board is connected to the connector, and FIG. 3B is a schematic cross-sectional view showing a state where the flexible wiring board is connected to the connector.

  As shown in FIGS. 3A and 3B, the first connector 104 includes an FPC 50 sandwiched between a base portion 105 provided with a conductor portion 106 and a resin-made pressing portion 109. The first connection land group TG1 composed of a plurality of connection lands 11 and the conductor 106 are electrically connected.

  A plurality of conductor portions 106 provided in the base portion 105 are arranged in a staggered manner and in a plane corresponding to the connection lands 11 of the FPC 50, and have a portion that penetrates the base portion 105 and is exposed on the opposite side. is doing. As a result, for example, the base portion 105 can be mounted on the surface of the first substrate 101 by soldering.

  Further, the base portion 105 has a pair of positioning pins 107 as positioning references for positioning the FPC 50 and a pair of stop pins 108 arranged at positions where the end portions of the FPC 50 come into contact with each other with a predetermined length. It is provided so as to protrude from the surface of the base portion 105.

  The pair of positioning pins 107 is disposed on the base portion 105 as a protrusion that fits into the cutout portion C <b> 1 of the FPC 50.

  The pressing portion 109 has a hole 109a and a hole 109b at positions corresponding to the pair of positioning pins 107 and the pair of stop pins 108, and has a convex portion 109c for pressing the FPC 50 from the base material side. Yes.

  Protrusions 107 a and 108 a that swell along the outer periphery of the pins are provided on the distal ends of the pair of positioning pins 107 and the pair of stop pins 108, respectively. Corresponding to the convex portions 107a and 108a, concave portions 109d are also provided in the holes 109a and 109b of the pressing portion 109, respectively.

  By fitting the notch portion C1 of the FPC 50 and the positioning pin 107 with the end portion of the FPC 50 in contact with the stop pin 108 of the base portion 105, the first connection land group TG1 and the conductor portion 106 are fitted. Can be positioned accurately. In addition, the convex portion 109c presses the FPC 50 from the base material side by fitting the pressing portion 109 into the positioning pin 107 and the stop pin 108 provided on the base portion 105 and pushing it in, so that the first connection connection is performed. The pressing portion 109 can be fixed to the base portion 105 in a state where the land group TG1 and the conductor portion 106 are sufficiently in contact with each other.

  The second connector 111 provided on the second substrate 110 has the same structure as the first connector 104, and the FPC 50 is connected to the second connection land group TG2 and the third connection land group TG3. It is possible.

  According to the OPU 100 of the present embodiment, since the FPC 50 is used, the connection length between the first substrate 101 and the second substrate 110 can be changed at least in two stages to be electrically connected. As a result, the electrical connection between the electro-optical device and the drive circuit 102 can be realized by changing the length.

  Now, the operation environment of the electro-optical device will be described by giving a more specific example of the electro-optical device. 4A is a schematic plan view showing a configuration of a liquid crystal light valve as an example of an electro-optical device, and FIG. 4B is a schematic plan view showing a configuration of an electro-viewfinder as another example of the electro-optical device. is there. FIG. 5 is a schematic diagram showing an operating environment of a projection display device using a liquid crystal light valve, and FIG. 6 is a schematic diagram showing an operating environment of an electroviewfinder.

  As shown in FIG. 4A, a liquid crystal light valve 200 as an electro-optical device has a transmissive liquid crystal panel 210 and fixing holes 202 at four corners, and is made of a metal that holds the liquid crystal panel 210. It has a first frame 201 and a second frame 203 made of the same metal that is fitted to the first frame 201 with the liquid crystal panel 210 interposed therebetween. A flexible wiring board (FPC) 204 as a relay board is connected to the liquid crystal panel 210. The FPC 204 is provided with a terminal portion 206 in which a plurality of connection terminals 207 for connection with the external drive circuit 102 are arranged. A driver IC 205 that receives a control signal from the external drive circuit 102 and sends the drive signal to the liquid crystal panel 210 is mounted.

  The liquid crystal panel 210 has a display area in which substantially square pixels 211 are arranged in a matrix. Each of the first frame 201 and the second frame 203 has an opening that corresponds to the display area of the liquid crystal panel 210.

  As shown in FIG. 4B, an electro viewfinder (EVF) 300 as an electro-optical device includes a transmissive liquid crystal panel 310, a backlight (not shown) using an LED as a light source, and a plastic that stores them. Frame 301. A flexible wiring board (FPC) 304 as a relay board is connected to the liquid crystal panel 310. The FPC 304 is provided with a terminal portion 305 in which a plurality of connection terminals 306 are arranged for connection with the external drive circuit 102.

  The liquid crystal panel 310 has a display area in which rectangular sub-pixels 311 (R, G, B) from which red (R), green (G), and blue (B) color lights are obtained are arranged in a matrix. Yes. One surface of the plastic frame 301 has an opening that opens to face the display area.

Next, the operating environment of the projection display device using the liquid crystal light valve 200 will be described.
As shown in FIG. 5, the projection display device 500 is, for example, a dichroic that separates light emitted from a light source (not shown) and red (R), green (G), and blue (B) light, for example. It is configured to include at least an optical system such as a mirror, liquid crystal light valves 200R, 200G, and 200B provided for each color light, a dichroic prism 501, and a projection lens 502.

  The red liquid crystal light valve 200 </ b> R and the blue liquid crystal light valve 200 </ b> B are arranged with a gap so that the display surface is parallel to the light incident surface facing the dichroic prism 501. The green liquid crystal light valve 200G is similarly arranged with a gap so that the display surface is parallel to the light incident surface that is adjacent to and intersects the light incident surface.

  The FPCs 204 of the liquid crystal light valves 200R, 200G, and 200B are connected to a third connector 112 provided on the second substrate 110 of the OPU 100 that is prepared correspondingly. Of course, the FPC 50 is connected to the second connector 111 of the second substrate 110, and electrical connection with the drive circuit 102 is achieved.

  The projection display device 500 controls the transmission state of the color light incident on the liquid crystal light valves 200R, 200G, and 200B based on the image information, and causes the dichroic prism 501 to enter the display light for each color light. The display light for each color light is synthesized by the dichroic prism 501, emitted toward the projection lens 502, and enlarged and projected onto the screen 505 by the projection lens 502, so that a full color display can be performed.

  According to such a projection type display device 500, the distance at the time of connection between the OPU 100 and each of the liquid crystal light valves 200R, 200G, and 200B can be appropriately adjusted depending on the relative positional relationship between the dichroic prism 501 and the OPU 100. It becomes. For example, the length of the FPC 50 that connects the two liquid crystal light valves 200R and 200B and the OPU 100 that are arranged to face the dichroic prism 501 can be different from the length of the FPC 50 that connects the liquid crystal light valve 200G and the OPU 100.

  Such a configuration of the FPC 50 in the OPU 100 can efficiently arrange each configuration of the projection display device 500 in a limited space housing. In addition, when the projection display device 500 is not a completed real machine but at the stage of a prototype, the length of the FPC 50 can be appropriately adjusted depending on the positional relationship with each component, and can be reflected in the final finished product. Furthermore, it is also effective when the projection display device 500 is used as an inspection device that inspects the driving state of the liquid crystal light valves 200R, 200G, and 200B. For example, depending on the liquid crystal light valve model, even if the length of the relay substrate is not constant, the length of the FPC 50 is adjusted and the liquid crystal light valve to be inspected is arranged at an appropriate position with respect to the dichroic prism 501. Is possible.

  Next, the operating environment of the EVF 300 will be described. The EVF 300 is used in a video camera, a digital camera, or the like, displays a captured moving image or still image in full color, and is directly viewed by an observer. In recent years, the recording capacity has increased with the evolution of imaging devices, so that the display function of the EVF 300 corresponding to that has been demanded, and the subpixel 311 in the liquid crystal panel 310 has become high definition. An example of the operating environment of the EVF 300 of the present embodiment relates to the inspection environment of the EVF 300 having such a high-definition sub-pixel 311.

  As shown in FIG. 6, the FPC 304 that is a relay board of the EVF 300 is connected to the third connector 112 provided on the second board 110 of the OPU 100. Of course, the FPC 50 is connected to the second connector 111 of the second substrate 110 and is electrically connected to the drive circuit 102. An optical system 600 such as a microscope or a camera that can be observed by enlarging the liquid crystal panel 310 is disposed at a position facing the display surface of the driven EVF 300.

  For example, even if the relative positions of the optical system 600 and the OPU 100 are fixed so as to be suitable for the work of the inspector and the length of the FPC 304 of the EVF 300 is different depending on the model, the FPC 50 connected to the second substrate 110. By appropriately adjusting the length of the EVF 300, the EVF 300 can be disposed at an appropriate position with respect to the optical system 600.

  As described above, having the FPC 50 capable of adjusting the connection length in the OPU 100 increases the types of electro-optical devices that can be driven by the OPU 100, thereby further increasing the commonality.

  Note that the specification of the relay board (FPC) provided in the electro-optical device differs depending on the model, so that the third connector 112 on the second board 110 needs to correspond to the model. In other words, it is necessary to prepare the second substrate 110 corresponding to the model.

  In this embodiment, the second substrate 110 is used to electrically connect the electro-optical device and the FPC 50. However, the present invention is not limited to this, and the relay substrate on the electro-optical device side and the FPC 50 are electrically connected. For example, a relay connector or the like may be used as means for connecting to the relay.

  Various modifications other than the above embodiment are conceivable. Hereinafter, a modification will be described.

(Modification 1) The configuration of the pair of outer shape references in the FPC 50 of the above embodiment is not limited to this. FIG. 7 is a schematic plan view showing the configuration of the FPC according to the first modification. For example, as shown in FIG. 7, the FPC 60 has an outer shape reference having a different shape from the FPC 50 of the above-described embodiment. Specifically, the length L1 and the length L2 in the longitudinal direction from one end of the substrate 1, and the both ends in the short direction of the length L4 and the length L5 from the other end of the substrate 1 Are provided with a pair of holes H1, H2, H3, and H4, each of which is formed by cutting out the substrate 1 in a circular shape.
The distance between the pair of holes H1, H2, H3, and H4 in the short direction is the same.
In addition, a pair of outer shape references that can be distinguished from each other corresponding to the first connection land group TG1, the second connection land group TG2, and the third connection land group TG3 are notches and holes of the base material 1. The shape of the alignment marks printed on the substrate 1 and the connecting lands located on both ends in the short direction are different from those of other connecting lands if the positioning with the connector is possible visually. The characteristic portion may be used as an alignment mark.
Furthermore, a contact hole may be provided for each connection land, and the contact land may be connected to a connector having a conductive protrusion that fits into the contact hole. According to this, it is possible to achieve both alignment and electrical connection.
In addition, the above-described notch portions, which are a pair of external shapes, and the notch holes of the modification are not limited to being provided corresponding to all the connection land groups. For example, when the third connection land group TG3 is used, it is sufficient that the unnecessary second connection land group TG2 can be cut and deleted with high precision. Therefore, at least a cutout corresponding to the third connection land group TG3 is used. It is good also as a structure which provides the part C3 or the notch hole H3.

  (Modification 2) The configuration of the connection land group in the FPC 50 of the above embodiment is not limited to this. FIG. 8 is a schematic plan view showing the configuration of the FPC according to the second modification. For example, as shown in FIG. 8, the FPC 70 is different from the FPC 50 of the above embodiment in the number and arrangement of connection land groups. Specifically, the first connection land group TG1 at one end in the longitudinal direction of the substrate 1, and a fifth connection land group TG5 and a plurality of connection lands 15 arranged in parallel therewith. And a sixth connection land group TG6 including the connection lands 16 are provided. The second connection land group TG2 at the other end in the longitudinal direction of the substrate 1, and a third connection land group TG3 and a plurality of connection lands 14 including a plurality of connection lands 13 arranged in parallel therewith. And a fourth land group for connection TG4. That is, a total of six connection land groups are arranged on the object in the longitudinal direction of the substrate 1. According to this, the length at the time of connection can be adjusted in the both ends of the longitudinal direction of FPC70.

(Modification 3) The configuration of the FPC 50 of the above embodiment is not limited to this. For example, based on the back side of the substrate 1 corresponding to the first connection land group TG1, the second connection land group TG2, and the third connection land group TG3 connected to the first connector 104 or the second connector 111. A reinforcing member thicker than the material 1 may be provided. Thereby, the mechanical strength of the connection portion can be improved with respect to repeated attachment to and removal from the connector.
Further, the shape of the substrate 1 is not limited to an elongated rectangular shape as shown in FIG. For example, the shape may be bent in a plane in the range of the length L2 in FIG. The wiring 10 in the bent portion also has a bent portion corresponding to the shape of the substrate 1. According to this, even if the position of the connector to be connected at both ends in the longitudinal direction of the substrate 1 is shifted in the direction intersecting the longitudinal direction, the connection can be made without applying stress such as bending to the substrate 1. It becomes.

  DESCRIPTION OF SYMBOLS 1 ... Base material, 2 ... Coverlay, 10 ... Wiring, 11, 12, 13, 14, 15, 16 ... Connection land, 50, 60, 70 ... Flexible wiring board (FPC), 100 ... Drive of electro-optical apparatus Operation unit (OPU) as a structure, 101 ... first substrate, 102 ... drive circuit, 104 ... first connector, 110 ... second substrate, 111 ... second connector, 112 ... third connector, 200 ... electro-optical device Liquid crystal light valve as 300, Electro viewfinder (EVF) as electro-optical device, 500 Projection type display device, C1, C2, C3, C4 Notched portion, TG1 First land for connection, TG2 Second connection land group, TG3... Third connection land group.

Claims (7)

An insulating base material having flexibility;
A plurality of wires extending in the longitudinal direction of the substrate;
A first connection land group and a second connection land group, each of which includes connection lands provided on both ends in the longitudinal direction of the plurality of wirings;
A third connection land group provided between the first connection land group and the second connection land group in the longitudinal direction of the plurality of wirings;
A flexible wiring board comprising: a pair of external reference provided at least on the both ends in the short direction of the base material so as to correspond to the third connection land group.   The flexible wiring board according to claim 1, wherein the pair of outer shape references are cutout portions formed by cutting out the base material.   3. The pair of outer shape references are provided for each of the first connection land group, the second connection land group, and the third connection land group. Flexible wiring board. The flexible wiring board according to any one of claims 1 to 3,
A first substrate having a first connector on which a drive circuit for an electro-optical device is mounted and electrically connecting the drive circuit and the flexible wiring board;
A drive circuit structure for an electro-optical device, comprising: a second connector that electrically connects the electro-optical device and the flexible wiring board. The flexible wiring board according to claim 3,
A first substrate having a first connector on which a drive circuit for an electro-optical device is mounted and electrically connecting the drive circuit and the flexible wiring board;
A second connector for electrically connecting the electro-optical device and the flexible wiring board;
The drive circuit structure for an electro-optical device, wherein each of the first connector and the second connector has a positioning reference with respect to the pair of external shapes of the flexible wiring board.   The pair of outer shape references of the flexible wiring board are notch portions in which the base material is cut out, and the positioning references of the first and second connectors are protrusions that fit into the notch portions. The drive circuit structure of the electro-optical device according to claim 3. A second board on which the second connector is mounted;
The said 2nd board | substrate is connected to the said 2nd connector through wiring, and has a 3rd connector with which the said electro-optical apparatus is electrically connected, The one of Claim 4 thru | or 6 characterized by the above-mentioned. A drive circuit structure for the electro-optical device according to the description.

Images