JP2009216810A - Electrooptical device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical device and electronic equipment capable of securing excellent display luminance by surely preventing floating of a display panel while reducing the size and cost. <P>SOLUTION: The electrooptical device includes an electrooptical panel 10 including electrooptical material, a wiring board 20 whose board end is connected to the electrooptical panel 10, and a frame 40 in which at least the electrooptical panel 10 is housed. The wiring board 20 comprises a flexible board, and has an electronic component mounting part 22 fixed to the back side of the electrooptical panel 10, and a connection part 21 connected to the electrooptical panel 10 by extending along the side end face of the frame 40 in width narrower than the electronic component mounting part 22, and notched parts 26a and 26b are formed at least at one end of a boundary part between the connection part 21 and the electronic component mounting part 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electro-optical device and an electronic apparatus.

Currently, in various electronic devices such as a mobile phone and a portable information terminal, a liquid crystal display device is used as a display unit for visually displaying various information.
As an example of such a liquid crystal display device, a liquid crystal display device including a liquid crystal panel which is an example of a display panel, a backlight (illumination device), and a frame for accommodating the liquid crystal panel and the backlight is known. .

  The liquid crystal panel includes a pair of substrates, a sealing material formed between the pair of substrates along the outer periphery of the substrate, and a liquid crystal disposed in a region surrounded by the pair of substrates and the sealing material. It is what is done. The backlight generally includes a light guide plate made of a light-transmitting resin and a light source that generates light. As such a light source, for example, an LED (Light Emitting Diode), a cold cathode tube, or the like can be used. Light emitted from the light source is introduced into the light guide plate, and then travels through the light guide plate. The light is emitted from the light exit surface of the light plate to the liquid crystal layer of the liquid crystal display device for display.

  The liquid crystal panel is connected to a wiring board having flexibility, such as an FPC (Flexible Printed Circuit). In this wiring board, for example, a driving circuit and an input terminal necessary for driving a liquid crystal panel are formed. By connecting an external power source and various external devices to the input terminal, the wiring board A drive signal and electric power can be supplied to the liquid crystal panel via this. In some cases, an LED as a light source is mounted and a liquid crystal panel can be irradiated with transmitted light by a light guide plate or a prism sheet. Mounting the light source (LED) on the wiring board is beneficial in terms of cost.

  In general, such a wiring board has a configuration in which it is linearly drawn from a liquid crystal panel (display panel) and bent for the purpose of reducing the size of the liquid crystal display device and increasing the degree of design freedom. Used in a state where bending stress is generated. In addition, the liquid crystal panel is housed in the frame by being attached to the backlight with an adhesive tape having light shielding properties. However, as the light shielding region of the liquid crystal panel is reduced, the liquid crystal panel is used as a light shielding region. The surface area of adhesive tape is also getting smaller.

  Therefore, as shown in FIG. 15, since the reaction force of the wiring substrate 101 is generated in a direction substantially perpendicular to the display surface of the liquid crystal panel 103, the liquid crystal panel 103 and the backlight 104 are bonded with the adhesive force of the adhesive tape 102 as described above. And the liquid crystal panel 103 may be peeled off from the backlight 104 and lifted up from the frame 105.

  As described above, when the liquid crystal panel 103 is peeled off from the backlight 104, a problem such as uneven surface luminance of the liquid crystal display surface occurs. Further, when the liquid crystal panel 103 is lifted from the frame 105, the positional relationship between the backlight 104 and the liquid crystal panel 103 is changed, so that the light of the backlight 104 cannot be used effectively, and the display quality of the liquid crystal display device 100 is increased. There is a problem that will decrease.

Therefore, as shown in FIG. 16, a configuration has been considered in which the reaction force of the wiring board 101 is suppressed by providing the ribs 111 and the like and pressing the liquid crystal panel 103 and the wiring board 101 (see, for example, Patent Document 1). ).
JP 2006-98811 A

  However, it is often insufficient to hold only the wiring board against the floating of the liquid crystal panel. Further, the structure for holding the liquid crystal panel may cause the panel to crack due to the ribs or the like strongly pressing the liquid crystal panel upon impact during dropping. Furthermore, a structure in which the polarizing plate is pressed by a rib or the like has been proposed. Such a structure is effective for the floating of the liquid crystal panel, but the size of the outer shape becomes large, and it cannot meet the current customer needs for a compact structure. For this reason, there is a demand for a structure in which the outer shape is stored compactly and the liquid crystal panel is reliably prevented from floating.

  In addition, due to variations in the length of the wiring board and the dimensions (tolerances) of the frame, there has been a problem that it becomes difficult to incorporate ribs or the like, and the pressing of the wiring board or the like by the ribs becomes weak.

  The present invention has been made in order to solve the above-described problems, and it is possible to ensure good display brightness by reliably preventing the display panel from floating while reducing the size and cost. An object of the present invention is to provide an electro-optical device and an electronic apparatus.

In order to achieve the above object, the present invention provides the following means.
The electro-optical device of the present invention is an electro-optical device including an electro-optical panel including an electro-optical material, a wiring board whose substrate end is connected to the electro-optical panel, and a frame that houses at least the electro-optical panel. The wiring board is made of a flexible substrate and has a wide portion and an electronic component mounting portion fixed to the back side of the electro-optical panel, and a side of the frame having a narrower width than the electronic component mounting portion. A connecting portion that extends along the end surface and is connected to the electro-optic panel, and a cutout portion is formed at at least one end of a boundary portion between the connecting portion and the electronic component mounting portion. Features.

  In the electro-optical device according to the present invention, the cutout portion is formed at least at one end of the boundary portion between the connection portion and the electronic component mounting portion, so that the bending stress of the wiring board (the wiring board tries to return to its original state). Reaction force). That is, in the electro-optical device of the present invention, since the electronic component mounting portion is fixed to the back side of the electro-optical panel, stress is concentrated on the bent portion of the wiring board. It is possible to prevent the reaction force of the wide electronic component mounting portion from acting on the connection portion. As a result, the stress applied to the bent portion of the wiring board can be relieved, so that the electro-optical panel can be prevented from floating from the frame. In this way, by reliably preventing the electro-optical panel from floating, it is possible to perform a good display without luminance unevenness and maintain the display quality of the image for a long period of time. In addition, since the present invention is not provided with a fixing portion that suppresses the reaction force of the wiring board as in the prior art, the entire device can be reduced in size and cost can be reduced.

  In the electro-optical device according to the aspect of the invention, the side end surface of the frame has a curved surface, and the connection portion of the wiring board maintains a gap between the side end surface of the frame and extends along the side end surface of the frame. It is preferable that the side edge of the wide part extending in the width direction from the connection part of the electronic component mounting part and the side edge of the frame substantially coincide with each other in plan view.

In the electro-optical device according to the invention, since the electronic component mounting portion has a wide portion extending in the width direction from the connection portion, for example, the side edge of the wide portion of the electronic component mounting portion and the side edge of the frame are attached to a jig. By pressing, the side edge of the electronic component mounting portion and the side edge of the frame can be substantially matched in plan view. Here, in the wiring board in which the notch portion is not formed, when the wiring board is folded back by aligning the side edge of the wide part of the electronic component mounting part and the side edge of the frame, the wide part of the electronic component mounting part is also easily bent, The assembly of the device becomes complicated. Therefore, the electro-optical device of the present invention can accurately position the wiring board with respect to the frame by a simple method, so that the number of assembling steps can be reduced and the cost can be reduced. It becomes.
Further, the side end surface of the frame has a curved surface, and the connection portion of the wiring board extends along the side end surface of the frame while maintaining a gap with the side end surface of the frame. Therefore, by maintaining an appropriate gap between the side end face of the frame and the connection portion of the wiring board, the stress on the wiring board is relieved, and excessive contact between the side end face of the frame and the connection portion is prevented. It is possible to prevent disconnection of the wiring formed on the substrate.

  In the electro-optical device according to the aspect of the invention, it is preferable that a slit extending along a length direction of the electronic component mounting portion is formed in the notch portion.

  In the electro-optical device according to the present invention, since the slit is formed in the notch portion along the length direction of the electronic component mounting portion, the reaction force of the wide electronic component mounting portion does not act on the connection portion. Can be. Therefore, the stress applied to the bent portion of the wiring board can be more effectively relaxed. That is, since the reaction force of the wiring board can be effectively suppressed, the electro-optical panel can be reliably prevented from floating.

  In the electro-optical device according to the aspect of the invention, the wiring board is provided with at least one through-hole penetrating from the front surface toward the back surface, and the back surface of the frame has at least one protrusion protruding toward the wiring substrate side. It is preferable that the protrusion penetrates the through hole provided in the wiring board.

  In the electro-optical device according to the aspect of the invention, since the wiring board is provided with at least one through hole and at least one protrusion is formed on the back surface of the frame, the protrusion is passed through the through hole provided in the wiring board. Thus, it is possible to accurately align the wiring board with respect to the frame.

  In the electro-optical device according to the aspect of the invention, at least one protrusion protruding toward the wiring board is provided on the back surface of the frame, and the side edge or the notch of the wide part of the electronic component mounting part. It is preferable that the bottom part on the electronic component mounting side of the part and the outer peripheral part of the projection on the back surface of the frame are in contact with each other.

  In the electro-optical device according to the aspect of the invention, the electronic component mounting side bottom of the wide part of the electronic component mounting part or the bottom part on the electronic component mounting side of the notch is in contact with the outer peripheral part of the protrusion on the back surface of the frame. It is possible to accurately align the wiring board.

  In the electro-optical device according to the aspect of the invention, it is preferable that the height dimension of the protrusion on the back surface of the frame is larger than the thickness dimension of the electronic component mounting portion.

  In the electro-optical device according to the present invention, since the height dimension of the protrusion on the back surface of the frame is larger than the thickness dimension of the electronic component mounting portion, it is possible to accurately align the wiring board with respect to the frame. In addition, by setting the height of the protrusion to the thickness of the electronic component mounting portion and the thickness including, for example, the electronic component and the semiconductor device mounted on the electronic component mounting portion, the protrusion becomes a substitute for the spacer. It is possible to prevent electronic components, semiconductor devices, and the like from coming into contact with other components.

  In the electro-optical device according to the aspect of the invention, it is preferable that a through hole is formed in a region adjacent to the connection portion side of the electronic component mounting portion of the wiring board.

  In the electro-optical device according to the present invention, the through hole is formed in a region adjacent to the connection portion side of the electronic component mounting portion of the wiring board. Thereby, even if it is a large-sized wiring board for large-sized liquid crystal panels, for example, the stress applied to the bent portion of the wiring board is reduced by the through hole in addition to the notch. Accordingly, since the electro-optical panel can be reliably prevented from floating, it is possible to perform good display without unevenness in luminance and maintain the display quality of the image for a long period of time.

  In the electro-optical device according to the aspect of the invention, at least one protrusion that protrudes toward the wiring board is provided on the back surface of the frame, and the protrusion penetrates the through hole, and the peripheral portion of the through hole. It is preferable that the outer peripheral portion of the protrusion is in contact with the projection.

  In the electro-optical device according to the present invention, the protrusion protruding from the wiring board side passes through the through hole, and the peripheral edge portion of the through hole and the outer peripheral portion of the protrusion are in contact with each other. By penetrating through the through hole, it is possible to accurately align the wiring board with respect to the frame.

  In the electro-optical device according to the aspect of the invention, the electronic component mounting portion may be fixed to the back surface side of the electro-optical panel via a fixing member provided on the front end portion side of the electronic component mounting portion with respect to the notch portion. It is preferable that

When the fixing member is provided near the bent portion of the wiring board, the stress applied to the bent portion of the wiring board is hardly relaxed. Therefore, the electronic component mounting portion is fixed to the frame by a fixing member provided closer to the front end portion of the electronic component mounting portion than the notch portion. That is, by providing the fixing member at a position away from the bent portion of the wiring board, it is possible to prevent the wiring board from peeling off from the frame while further relaxing the stress applied to the bent portion of the wiring board.
Furthermore, since the fixing member is provided on the front end side of the electronic component mounting portion relative to the notch portion, the fixing member is not exposed from the notch portion. Thereby, it becomes possible to suppress that a fixing member adversely affects other members.

  In the electro-optical device according to the aspect of the invention, it is preferable that an external connection terminal is provided in the electronic component mounting portion.

  Here, when the external connection terminal is provided in the electronic component mounting part of the wiring board, it is necessary to arrange the external connection terminal at an accurate position. Therefore, in the electro-optical device of the present invention, the wiring board can be accurately aligned with the frame. Therefore, even when the external connection terminal is provided on the wiring board, the external connection terminal and the external connection terminal are connected to the external connection terminal. It is possible to connect the other connection terminals to be connected satisfactorily.

According to another aspect of the invention, there is provided an electronic apparatus including the above electro-optical device.
According to the electronic apparatus of the present invention, since the above-described electro-optical device is provided, it is possible to display a high-quality and reliable image without luminance unevenness.

  Hereinafter, embodiments of an electro-optical device and an electronic apparatus according to the invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

[First Embodiment]
A first embodiment of the electro-optical device according to the invention will be described below.
FIG. 1 is an exploded perspective view of a liquid crystal display device according to this embodiment. 2 is a schematic plan view of the assembled liquid crystal display device, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, FIG. 4 is a schematic plan view of the FPC board, and FIG. FIG. 6 is a view showing an example of a method of bending the FPC board, and FIG. 7 is a cross-sectional view taken along line BB of FIG.
As shown in FIG. 1, the liquid crystal display device (electro-optical device) 1 includes a liquid crystal panel (electro-optical panel) 10, an FPC (Flexible Printed Circuit) substrate (wiring substrate) 20 connected to the liquid crystal panel 10, An illumination device 30 that illuminates the liquid crystal panel 10 and a frame 40 that houses the liquid crystal panel 10 and the illumination device 30 are provided.

Next, each component will be described in detail with reference to FIGS.
[LCD panel]
As shown in FIG. 1, the liquid crystal panel 10 has a first substrate 11, a second substrate 12 having an overhanging portion 12 a that projects from the first substrate 11, and the first substrate 11 and the second substrate 12. A liquid crystal layer (not shown) as an electro-optical material disposed in a space formed by the sealing material (not shown) provided on the peripheral edge of the substrate, the first substrate 11 and the second substrate 12 and the sealing material, A first polarizing plate 13 and a second polarizing plate 14 are provided so as to sandwich the first and second substrates 11 and 12. The first substrate 11 and the second substrate 12 are made of translucent glass, plastic, or the like.

  On the surface of the first substrate 11 facing the second substrate 12, for example, a stripe-shaped first transparent electrode made of a plurality of ITO (Indium · Tin Oxide) films is provided to cover the first transparent electrode. Thus, an alignment film made of polyimide or the like is formed. On the other hand, on the surface of the second substrate 12 facing the first substrate 11, for example, a plurality of ITO films made of a plurality of ITO films are provided so as to intersect the first transparent electrode. 2 An alignment film made of polyimide or the like is formed so as to cover the transparent electrode. Here, the first transparent electrode, the second transparent electrode, and the alignment film covering them are formed by a known technique, and are not shown in FIG.

  Further, as shown in FIG. 2, a driving circuit 50 and an input terminal (not shown) necessary for driving the liquid crystal panel 10, for example, are formed on the projecting portion 12a. By connecting an external power source and various external devices, a driving signal and power can be supplied to the liquid crystal panel 10 via the FPC board 20.

  In the liquid crystal panel 10 having such a configuration, pixels are formed by the first transparent electrode and the second transparent electrode facing each other, and a liquid crystal layer sandwiched between them. And the optical characteristic of a liquid crystal layer is changed by selectively changing the voltage applied to each pixel, and the light irradiated from the illuminating device 30 is modulated by transmitting through this liquid crystal layer of each pixel. Thus, by modulating the light, an image or the like can be displayed, and the display area in the liquid crystal panel 10 is substantially equal to the display area V surrounded by the sealing material.

[Lighting device]
As shown in FIG. 1, the illumination device 30 includes an LED (light source) 31 that emits light, a light guide plate 32, a reflection plate 33, a diffusion plate 34, a first prism sheet 35, and a second prism sheet 36. The reflector plate 33, the light guide plate 32, the diffuser plate 34, the first prism sheet 35, and the second prism sheet 36 are arranged in this order toward the liquid crystal panel 10.
As shown in FIG. 1, the light guide plate 32 has a light guide region 32 d that emits light to the display region V of the liquid crystal panel 10 and a first portion that supports the protruding portion 12 a when assembled as the liquid crystal display device 1. A support region 32g in which the support portion 32a is disposed, and an LED region 32f in which four first recesses 32b for housing the light source 31 disposed in a region between the support region 32g and the light guide region 32d are provided. .

  The first support portion 32a of the light guide plate 32 has a shape in which the light guide region 32d extends, is disposed along one side 30a of the light guide plate 32, and has the emission end face 30b facing upward (the liquid crystal panel 10 side). Is formed in a convex shape protruding slightly upward from the light guide region 32d. In the present embodiment, the height when the light guide region 32d of the first support portion 32a is used as a reference is such that the second polarizing plate 14, the first prism sheet 35, the second prism sheet 36, and the diffusion plate 34 are overlapped. It almost corresponds to the thickness of time.

  The light guide region 32 d of the light guide plate 32 substantially corresponds to the display region V of the liquid crystal panel 10. On the two sides 30c and 30d orthogonal to the one side 30a of the light guide plate 32, five protrusions 32e protruding from the light guide region 32d are provided for each of the sides 30c and 30d. Each of these protrusions 32e is inserted into a corresponding recess 40b provided in the frame 40 and fixed. The protrusions 32e are arranged at substantially equal intervals.

The LED region 32f is adjacent to five second support portions 32h that support the FPC board 20 by bonding and fixing the light guide plate 32 and the electronic component mounting portion 22 of the FPC board 20 when the liquid crystal display device 1 is assembled. It has four 1st recessed parts 32b in which LED31 shown in FIG. 1 arrange | positioned between the 2nd support parts 32h is accommodated. In the present embodiment, the height of the LED 31, that is, the dimension of the LED 31 along the thickness direction of the light guide plate 32 is substantially the same as the thickness of the light guide plate 32 in the light guide region 32d. 32 is a hole penetrating through 32. Thus, by providing the light guide plate 32 with the first recess 32b that accommodates the LED 31, it is not necessary to provide the LED 31 in a state of protruding from the light guide plate 32, and the liquid crystal display device 1 can be downsized.
The illuminating device 30 and the liquid crystal panel 10 are bonded together via a double-sided light shielding sheet 37 that can be bonded on both sides. The double-sided light shielding sheet 37 has a light shielding property and prevents light leakage from the lighting device 30.
As shown in FIGS. 2 and 3, when the liquid crystal display device 1 is assembled, the FPC board 20 that linearly extends from the liquid crystal panel 10 is curved so that the first recess 32 b formed in the light guide plate 32. The LED 31 is arranged inside to constitute the light source unit of the illumination device 30.

Bending stress is generated in the FPC board 20 bent in this way. That is, an external force is applied to the liquid crystal panel 10 to which the FPC board 20 in which bending stress is generated is connected.
As shown in FIG. 1, the liquid crystal panel 10 is bonded to the light guide plate 32 by a frame-shaped double-sided light shielding sheet 37. The double-sided light shielding sheet 37 also serves as a light shielding region of the liquid crystal panel 10. In general, the area of the light shielding region is very small, and the surface area of the double-sided light shielding sheet 37 is also small. Therefore, it is difficult for the adhesive force of the double-sided light shielding sheet 37 to withstand the stress generated in the liquid crystal panel 10 as described above.
Therefore, the liquid crystal panel 10 accommodated in the frame 40 is subjected to a force that causes the liquid crystal panel 10 to peel off from the light guide plate 32 or the frame 40 due to the stress and to float from the frame 40.

[FPC board]
As shown in FIGS. 1 and 3, the FPC board 20 includes a connection portion 21 and an electronic component mounting portion 22. In addition, a wiring that is conductively connected to the input terminal disposed on the projecting portion 12a by an ACF (conductive adhesive) or the like is formed on the connecting portion 21, and the electronic component mounting portion 22 is electrically connected to the wiring. A plurality of semiconductor devices 54 as circuit elements to be connected, mounting components such as a capacitor 51, a coil 52, and a resistor 52 are arranged. Further, a plurality of LEDs 31 (four in this embodiment) as light source units are arranged on the back surface 20c.

  The semiconductor device 54 supplies a control signal and power to the drive circuit 50 of the liquid crystal panel 10. Furthermore, wiring (not shown) for supplying a control signal, a power source, and the like from the outside to the semiconductor device 54 is formed on the back surface 20c of the FPC board 20. The FPC board 20 has an end portion 21a opposite to the electronic component mounting portion 22 of the connection portion 21 fixed to the protruding portion 12a by ACF or the like. The wiring of the FPC board 20 is conductively connected to the input terminal on the overhanging portion 12a by the conductive particles in the ACF.

  As shown in FIGS. 2 and 3, the FPC board 20 is used in a state of being bent so as to overlap the back side of the liquid crystal panel 10 when the liquid crystal display device 1 is configured. Therefore, the frame 40 has a wiring board recess 40c on one side of the frame 40 so that the electronic component mounting portion 22 of the bent FPC board 20 is easily located on the back surface 33a of the reflector 33 shown in FIG. Is formed. As shown in FIG. 3, the frame 40 has a curved surface that is curved from the upper surface 41 of the wiring substrate recess 40 c toward the side end surface 42. Further, the connection portion 21 of the FPC board 20 extends along the side end surface 42 of the frame 40 while maintaining a gap with the side end surface 42 of the frame 40.

  As shown in FIG. 4, the FPC board 20 is an electronic device having a connecting part 21 having a board end 20 d attached to the projecting part 12 a of the second board 12 and a tip 20 e fixed on the back side of the liquid crystal panel 10. And a component mounting unit 22. In the present embodiment, the electronic component mounting unit 22 is fixed to the back surface 33 a of the reflection plate 33. When the frame 40 is provided on the back surface 33 a side of the reflecting plate 33, the electronic component mounting unit 22 is fixed to the frame 40.

Both end portions of the electronic component mounting portion 22 extend in the width direction from the connection portion 21. That is, when comparing the length (width) L1 of the connecting portion 21 in the direction substantially orthogonal to the length direction of the FPC board 20 (vertical direction in FIG. 4) and the length (width) L2 of the electronic component mounting portion 22, The length L2 of the electronic component mounting part 22 is larger (L1 <L2). Further, notches 26a and 26b are formed at both ends A1 and A2 of the boundary portion between the connection portion 21 and the electronic component mounting portion 22. The notches 26a and 26b are formed in a circular arc shape having a curved surface. For example, the radius of curvature is about 0.4 mm to 1.5 mm.
Further, as shown in FIG. 5, the connecting portion 21 extends along the side end face 42 of the frame 40, and the semiconductor device 54 is mounted on the electronic component mounting portion 22. In addition, an electronic component or the like can be mounted on the wide portion 23 extending on both sides of the electronic component mounting portion 22.

Next, a method for bending the FPC board 20 will be described.
First, after fixing the board end 20 d of the FPC board 20 to the projecting part 12 a of the second board 12, the electronic component mounting part 22 is turned around to the back side of the liquid crystal panel 10 by the side end face 42 of the frame 40. As shown in FIG. 6, the jig 59 has two block-shaped members, and the connecting portion 21 of the FPC board 20 is arranged between these block-shaped members. . As shown in FIGS. 6 and 7, the frame 40 around which the FPC board 20 is wrapped is set on the jig 59. Then, the end face 22 a of the wide part 23 of the electronic component mounting part 22 and the side end face 42 of the frame 40 on which the connection part 21 is arranged are pressed against the jig 59. In this way, the electronic component mounting portion 22 is fixed to the back surface 33a of the reflector 33 with the end surface 22a of the electronic component mounting portion 22 and the side end surface 42 of the frame 40 being flush with each other. As a result, the FPC board 20 can be fixed in an accurately aligned state.
As shown in FIG. 5, a double-sided tape (fixing member) 45 is provided on the side of the tip 22d of the electronic component mounting part 22 from the notches 26a and 26b. And the electronic component mounting part 22 is fixed to the reflecting plate 33 arrange | positioned at the back surface side of the liquid crystal panel 10 with the double-sided tape 45. FIG. At this time, the double-sided tape 45 is provided at a position where it is not exposed from the notches 26a and 26b.

  In the liquid crystal display device 1 according to the present embodiment, since the notches 26a and 26b are formed at both ends of the boundary portion between the connection portion 21 and the electronic component mounting portion 22, the bending stress of the FPC board 20 (the wiring board is (Reaction force to return to the original) can be suppressed. That is, in the liquid crystal display device 1 of the present invention, since the electronic component mounting portion 22 is fixed around the back side of the liquid crystal panel 10, stress concentrates on the bent portion of the FPC board 20, but the notch 26a. , 26b can prevent the wide electronic component mounting portion 22 from being bent together with the connection portion 21, thereby preventing the reaction force of the electronic component mounting portion 22 from acting on the panel. . Therefore, since the stress applied to the bent portion of the FPC board 20 can be relaxed, the liquid crystal panel 10 can be prevented from floating from the frame 40. In this way, by reliably preventing the liquid crystal panel 10 from floating, it is possible to perform good display without unevenness in luminance and maintain the display quality of the image for a long period of time. Further, according to the present invention, since it is not necessary to provide the frame with a fixing portion that suppresses the reaction force of the FPC board 20 as in the prior art, the entire apparatus can be reduced in size and cost can be reduced.

Further, in the FPC board 20 in which the notches 26 a and 26 b are not formed, even if the FPC board 20 is folded back with the end face 22 a of the wide part 23 of the electronic component mounting part 22 aligned with the side end face 42 of the frame 40. The wide part 23 of the electronic component mounting part 22 is also easily bent, and the assembly of the apparatus becomes complicated. However, by forming the notches 26a and 26b, the bending of the wide portion 23 of the electronic component mounting portion 22 can be suppressed. Thereby, since the liquid crystal display device 1 of the present invention can accurately align the FPC board 20 with respect to the frame 40 by a simple method, the number of assembling steps can be reduced and the cost can be reduced. It becomes possible to plan.
That is, the liquid crystal display device 1 of the present embodiment can reliably prevent the liquid crystal panel 10 from floating and ensure good display luminance while reducing the size and cost.

  Further, the side end surface 42 of the frame 40 has a curved surface, and the connecting portion 21 of the FPC board 20 extends along the side end surface 42 of the frame 40 with a gap between the side end surface 42 and the side end surface 42 of the frame 40. Therefore, by maintaining an appropriate gap between the side end surface 42 of the frame 40 and the connection portion 21 of the FPC board 20, the stress of the FPC board 20 is relieved, and the side end surface 42 of the frame 40 and the connection portion 21 are excessively reduced. It is possible to prevent the wirings formed on the FPC board 20 from being cut off.

In addition, the shape of the notches 26a and 26b of the FPC board 20 is not limited to the shape described above. For example, it may be V-shaped or U-shaped.
The electronic component mounting part 22 may be provided with an external connection terminal 55. Here, when the external connection terminal 55 is provided in the electronic component mounting part 22 of the FPC board 20, it is necessary to arrange the external connection terminal 55 at an accurate position. Therefore, in the liquid crystal display device 1 of the present embodiment, since the FPC board 20 can be accurately aligned with the frame 40, even when the external connection terminal 55 is provided on the FPC board 20, the external connection terminal 55 is provided. It is possible to satisfactorily connect the housing-side connection terminal connected to the external connection terminal 55.
Further, the shape of the double-sided tape 45 is not limited to that shown in FIG. 5, and as shown in FIG. 8, the shape according to the shape of the electronic component mounting portion 22, that is, the double-sided tape having a protruding portion in the wide portion 23. 46 may be sufficient.

Further, as shown in FIGS. 9A, 9B, and 9C, the frame 40 may have a configuration in which protrusions 57a, 57b, and 58 are provided on the wide portion 23 side. In FIGS. 9A to 9C, only the projections 57a, 57b, and 58 on one side are shown.
As shown in FIG. 9A, in the configuration in which the columnar protrusion 57a protruding toward the FPC board 20 is provided on the back surface 40a of the frame 40, the FPC board 20 penetrates from the front surface toward the back surface. A hole 56 is provided. The protrusion 57 a passes through a through hole 56 provided in the FPC board 20. With this configuration, it is possible to accurately align the FPC board 20 with respect to the frame 40.
Further, the height dimension of the protrusion 57 a is larger than the thickness dimension of the electronic component mounting portion 22. This makes it possible to accurately align the FPC board 20 with respect to the frame. The height dimension S1 of the protrusion 57a is preferably larger than the height dimension S2 including the electronic component mounting portion 22 and the semiconductor device 54. Thereby, the protrusion 57a can be used as a spacer, and the mounting component, the semiconductor device 54, and the like can be prevented from coming into contact with other components.
In addition, although the through-hole 56 and the protrusion 57a were each provided in the wide part 23 side, it was provided only in one side, and may be provided in three or more.

Further, as shown in FIG. 9B, a configuration in which a columnar protrusion 57b protruding toward the FPC board 20 is provided in the vicinity of the side end face 42 of the back surface 40a of the frame 40 may be employed. In this configuration, the bottom portion 26c of the cutout portions 26a and 26b on the electronic component mounting portion 22 side and the outer peripheral portion of the protrusion 57b on the back surface 40a of the frame 40 are in contact with each other. Therefore, the FPC board 20 can be accurately aligned with the frame 40 by the notches 26a and 26b and the protrusions 57b.
Further, as shown in FIG. 9C, a configuration in which a rectangular columnar protrusion 58 protruding toward the FPC board 20 side is provided in the vicinity of the side end surface 42 of the back surface 40 a of the frame 40 may be employed. With this configuration, the side edge 22b of the wide portion 23 of the electronic component mounting portion 22 is in contact with the outer peripheral portion of the protrusion 58 of the back surface 40a of the frame 40. Accordingly, the projection 58 can accurately align the FPC board 20 with respect to the frame 40.

Further, the FPC board 20 has a configuration in which cutout portions 26a and 26b are formed at both ends A1 and A2 of the boundary portion between the connection portion 21 and the electronic component mounting portion 22, but as shown in FIG. The notch 26b may be formed only at one end A2.
Further, the liquid crystal display device 1 including the liquid crystal panel 10 as an electro-optical device has been described as an example. However, the present invention is not limited to this, and the present invention can be applied to general electro-optical devices.
Further, the end surface 22a of the wide portion 23 of the electronic component mounting portion 22 and the side end surface 42 of the frame are substantially the same in plan view, but the side end 22b of the wide portion 23 and the side end 40e of the frame 40 are coincident. You just have to match.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described with reference to FIG. FIG. 11 is a plan view of the FPC board 60. In the drawings of the respective embodiments described below, portions having the same configuration as those of the liquid crystal display device 1 according to the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
In the liquid crystal display device according to the present embodiment, the shape of the FPC board 60 is different from that of the first embodiment. Other configurations are the same as those of the first embodiment.

The FPC board 60 includes a connection part 21 and an electronic component mounting part 61. As shown in FIG. 11, slits along the length direction of the electronic component mounting portion 61 of the FPC board 60 may be formed in the notches 62 a and 62 b. Moreover, the length of the slit of the notches 62a and 62b is about 0.4 mm to 10 mm.
In this configuration, since the slits are formed in the cutout portions 62a and 62b in the length direction of the electronic component mounting portion 61, the wide portion 23 of the wide electronic component mounting portion 61 becomes more difficult to bend, and the liquid crystal The reaction force against the panel 10 can be further reduced. Therefore, the stress applied to the bent portion of the FPC board 60 can be more effectively reduced, and the liquid crystal panel 10 can be reliably prevented from floating.
Moreover, it is preferable that the double-sided tape 45 for fixing the electronic component mounting portion 61 is provided closer to the front end portion 60a than the notches 62a and 62b. Thereby, since it can suppress that stress concentrates on the part which the FPC board 20 bends, reaction force can further be reduced.

[Third Embodiment]
Next, a third embodiment according to the present invention will be described with reference to FIG. FIG. 12 is a plan view of the FPC board 70.
The liquid crystal display device according to the present embodiment differs from the first embodiment in the shape of the FPC board 70. Other configurations are the same as those of the first embodiment.

As shown in FIG. 12, the FPC board 70 has three penetrations on the area adjacent to the connection part 21 side of the electronic component mounting part 22 of the FPC board 20, that is, on the line connecting the two notches 26a and 26b. A hole 71 is formed. In FIG. 12, an example in which three through-holes 71 are formed is given as an example, but the number of through-holes 71 is not limited to this, and even if four or more are formed, only one is formed. May be.
In this configuration, a through hole 71 is formed in the FPC board 70 on a line connecting two notches 26a and 26b. Thereby, for example, even in a large FPC board for a large liquid crystal panel, the stress applied to the bent portion of the FPC board is reduced by the through hole 71 in addition to the notches 26a and 26b. Accordingly, since the liquid crystal panel 10 can be reliably prevented from floating, it is possible to perform a good display without unevenness in luminance and maintain the display quality of an image for a long period of time.

  As shown in FIG. 13, a protrusion 72 may be provided at a position corresponding to the through hole 71. In this configuration, the protrusion 72 protruding from the FPC board 20 side passes through the through hole 71, and the peripheral edge portion of the through hole 71 and the outer peripheral portion of the protrusion 72 are in contact with each other. Thus, by allowing the protrusion 72 to penetrate the through hole 71, the FPC board 20 can be accurately aligned with the frame 40.

[Electronics]
Next, an electronic apparatus including the liquid crystal display device 1 having the above-described configuration will be described. In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. Here, FIG. 14 is an external perspective view showing a mobile phone which is an electronic apparatus including the liquid crystal display device 1 of the present invention. The electronic apparatus according to the present embodiment is a mobile phone 300 as shown in FIG. 14, and includes a main body 301 and a display body 302 that can be opened and closed. A display device 303 is arranged inside the display body 302, and various displays relating to telephone communication can be visually recognized on the display screen 304. In addition, operation buttons 305 are arranged on the main body 301.
An antenna 306 is attached to one end of the display body 302 so as to be extendable. In addition, a speaker (not shown) is built in the receiver 307 provided on the upper portion of the display body 302. Furthermore, a microphone (not shown) is built in the transmitter 308 provided at the lower end of the main body 301. Here, the liquid crystal display device 1 is used for the display device 303.
In addition, although the liquid crystal display device 1 was used as the display device 303, it is not restricted to this, You may use the liquid crystal display device of 2nd, 3rd embodiment.

  In addition to the mobile phone, the electronic device of the present invention includes, for example, an electronic notebook, a personal computer, an electronic book, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, and a word processor. , Workstations, videophones, POS terminals and the like.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention. It is a top view of the liquid crystal display device of FIG. It is AA sectional drawing of FIG. It is a top view of the wiring board of FIG. It is the perspective view seen from the back surface side of the liquid crystal display device of FIG. It is a schematic diagram which shows the alignment method of the wiring board of FIG. It is BB sectional drawing of FIG. It is a modification of the shape of the double-sided tape of FIG. It is a perspective view which shows the structure by which protrusion was provided in the liquid crystal display device of FIG. It is a top view which shows the modification of the wiring board of FIG. It is a disassembled perspective view which shows the wiring board of the liquid crystal display device which concerns on 2nd Embodiment of this invention. It is a disassembled perspective view which shows the wiring board of the liquid crystal display device which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the structure by which protrusion was provided in the liquid crystal display device of FIG. It is a schematic block diagram of the mobile telephone which concerns on the electronic device of this invention. It is sectional drawing which showed the trouble of the conventional liquid crystal display device. It is sectional drawing which showed the other problem of the conventional liquid crystal display device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device (electro-optical device), 10 ... Liquid crystal panel (electro-optical panel), 20 ... FPC board | substrate (wiring board), 20d ... Board | substrate edge part, 20e ... Tip part, 21 ... Connection part, 22 ... Electronic component Mounting part, 22a ... side edge, 40 ... frame, 40e ... side edge, 42 ... side end surface, 300 ... mobile phone

Claims (9)

An electro-optical device comprising: an electro-optical panel including an electro-optical material; a wiring board whose substrate end is connected to the electro-optical panel; and a frame that houses at least the electro-optical panel.
The wiring board is made of a flexible substrate and has a wide part and is fixed to the back side of the electro-optical panel. The electronic part mounting part is narrower than the electronic part mounting part and extends along the side end surface of the frame. A connection portion extending and connected to the electro-optical panel,
An electro-optical device, wherein a notch portion is formed at least at one end of a boundary portion between the connection portion and the electronic component mounting portion. The side end surface of the frame has a curved surface, and the connection portion of the wiring board extends along the side end surface of the frame while maintaining a gap with the side end surface of the frame.
2. The electro-optic according to claim 1, wherein a side edge of the wide part extending in a width direction from the connection part of the electronic component mounting part and a side edge of the frame substantially coincide with each other in a plan view. apparatus.   The electro-optical device according to claim 1, wherein a slit extending along a length direction of the electronic component mounting portion is formed in the notch portion. The wiring board is provided with at least one through-hole penetrating from the front surface to the back surface,
2. The rear surface of the frame is provided with at least one protrusion projecting toward the wiring board, and the protrusion penetrates the through hole provided in the wiring board. The electro-optical device according to claim 3. At least one protrusion protruding toward the wiring board side is provided on the back surface of the frame,
The electronic component mounting side bottom portion of the wide portion of the electronic component mounting portion or the bottom portion of the notch portion on the electronic component mounting side is in contact with the outer peripheral portion of the protrusion on the back surface of the frame. The electro-optical device according to any one of claims 1 to 3.   6. The electro-optical device according to claim 4, wherein a height dimension of the protrusion on the back surface of the frame is larger than a thickness dimension of the electronic component mounting portion.   4. The electro-optical device according to claim 1, wherein a through-hole is formed in a region adjacent to the connection portion side of the electronic component mounting portion of the wiring board. At least one protrusion protruding toward the wiring board side is provided on the back surface of the frame,
The electro-optical device according to claim 7, wherein the protrusion penetrates the through-hole, and a peripheral edge portion of the through-hole and an outer peripheral portion of the protrusion are in contact with each other.   An electronic apparatus comprising the electro-optical device according to any one of claims 1 to 8.

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