JP2006030829A - Optoelectronic device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a more miniaturized optoelectronic device as compared with a conventional device by reducing the projection amount of a bent part of a flexible wiring board and preventing the overlap of circuit parts to a liquid crystal panel in the depth direction. <P>SOLUTION: A liquid crystal display device comprises a liquid crystal panel 2 including liquid crystal and an FPC 5 connected to the liquid crystal panel 2 and bent to the direction of the liquid crystal panel 2. The FPC 5 has a wire 52 extended in approximately parallel with the side end of the liquid crystal panel 2 on the bent part 5c. The FPC 5 has also a plurality of circuit parts 51 extended approximately in parallel with the side end of the liquid crystal panel 2 and arranged approximately linearly on the bent part 5c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electro-optical device formed by connecting a flexible wiring board on which circuit components are mounted to an electro-optical panel containing an electro-optical material. The present invention also relates to an electronic apparatus configured using the electro-optical device.

  Currently, electro-optical devices such as liquid crystal display devices and EL devices are widely used in various electronic devices such as mobile phones and portable information terminals. For example, an electro-optical device is used as a display unit for visually displaying various types of information related to electronic devices. In this electro-optical device, a device using liquid crystal as an electro-optical material, that is, a liquid crystal display device is known. An EL device using EL (Electro Luminescence) as an electro-optical material is also known.

  For example, a liquid crystal display device has a liquid crystal panel as an electro-optical panel. This liquid crystal panel generally has a structure in which a liquid crystal layer is interposed between a pair of substrates each having an electrode. This liquid crystal layer is formed, for example, as follows, that is, by forming a space surrounded by a sealing material between the pair of substrates and sealing the liquid crystal in this space. In this liquid crystal display device, the orientation of liquid crystal molecules in the liquid crystal layer is controlled for each pixel by supplying light to the liquid crystal layer and controlling the voltage applied to the liquid crystal layer for each pixel. The light supplied to the liquid crystal layer is modulated according to the alignment state of the liquid crystal molecules, and by supplying the modulated light to the liquid crystal side surface of the polarizing plate, letters, numbers, figures, etc. are formed on the observation side surface of the polarizing plate. Is displayed.

  In general, a flexible wiring board such as an FPC (Flexible Printed Circuit) is connected to the liquid crystal panel. In the FPC, a circuit necessary for driving the liquid crystal panel is formed. This circuit is usually formed by forming wirings in a predetermined pattern on a base substrate and further mounting circuit components such as ICs, capacitors, coils, resistors, etc. at predetermined positions on the base substrate. An input terminal is formed in the FPC, and an external power source and various external devices are connected to the input terminal. A signal and power for driving the liquid crystal panel are supplied from an external device or an external power source through the FPC. In general, the FPC is often bent toward the liquid crystal panel after being connected to the liquid crystal panel, rather than being connected to the liquid crystal panel and extending linearly. This is because there is a desire to reduce the overall shape of the liquid crystal display device.

  Incidentally, electronic devices such as mobile phones and portable information terminals are becoming smaller in size, and accordingly, electro-optical devices such as liquid crystal display devices used in those electronic devices are also required to be reduced in size. In order to meet this demand, a liquid crystal display device having a structure in which an LED (Light Emitting Diode) that is a light source for illuminating a liquid crystal panel is provided in a bent portion of an FPC is known (for example, Patent Document 1 and Patent Document 2). According to these liquid crystal display devices, the size of the liquid crystal display device is reduced by arranging the LEDs in a space formed inside the bent portion of the FPC, that is, by effectively using the space. It was.

JP 2003-92020 (3rd page, FIG. 1) JP 2000-98415 A (page 3, FIG. 1)

  However, in the conventional liquid crystal display device disclosed in Patent Document 1, the overhang dimension of the bent portion of the FPC from the liquid crystal panel cannot be reduced. This is because if the overhanging dimension is reduced, the FPC may be peeled off from the panel at the connection portion between the panel and the FPC where the FPC starts to bend. Moreover, if the overhang dimension of the bent portion of the FPC is reduced, the LED mounted on the FPC may be peeled off from the FPC at the portion where the FPC starts to bend. In order to prevent such peeling of the FPC and LED, in the conventional liquid crystal display device, the bent portion of the FPC has to be greatly projected outside the liquid crystal panel, and therefore the liquid crystal display device cannot be made sufficiently small. It was.

  Further, in the conventional liquid crystal display device disclosed in Patent Document 2, a plurality of circuit components on the FPC are placed in a position overlapping the liquid crystal panel in a state in which the FPC is bent. There was a possibility that the device could not be made thin enough.

  The present invention has been made in view of the above problems, and it is possible to reduce the overhang amount of a bent portion of a flexible wiring board or to overlap a circuit component and a liquid crystal panel in the thickness direction. It is an object of the present invention to provide an electro-optical device and an electronic apparatus that are much smaller than conventional ones by preventing this.

  A first electro-optical device according to the present invention includes an electro-optical panel including an electro-optical material, and a flexible wiring board connected to the electro-optical panel and bent toward the electro-optical panel. The wiring board has a linear member extending substantially parallel to the side edge of the electro-optical panel at the bent portion.

  In the above configuration, the electro-optical material is a material whose characteristics change according to a change in an electric field, and for example, a liquid crystal, an organic EL, an inorganic EL, or the like can be considered. The electro-optical panel is a panel structure formed to include an electro-optical material. Moreover, the flexible wiring board can be configured by, for example, FPC. This FPC is formed, for example, by forming a desired circuit on a film made of polyimide or polyester as a base material. These films are excellent in bendability but at the same time have elasticity. Therefore, if the amount of bending of the film protruding from the edge of the electro-optic panel is reduced, circuit components mounted in the vicinity of the bending portion and electro-optical panels connected in the vicinity of the bending portion are There is a risk of peeling from the FPC due to elasticity.

  According to the first electro-optical device, the linear member that extends substantially parallel to the side edge of the electro-optical panel is provided in the bent portion of the wiring board. Can be easily bent. For this reason, a wiring board can be bent easily and the force which the bent wiring board tries to return to the original by the elasticity can be weakened. As a result, even when the amount by which the bent portion of the wiring board protrudes is reduced, it is possible to prevent the circuit components and the electro-optical panel provided in the vicinity of the bent portion from peeling off. Therefore, the shape of the electro-optical device can be reduced.

  In the electro-optical device according to the present invention having the above-described configuration, it is preferable that the linear member has a linear pattern. If it carries out like this, when a wiring board is bent, a clean and smooth bending wrinkle can be given to a wiring board.

  In the electro-optical device according to the aspect of the invention, it is preferable that the linear member is positioned substantially at the top of the bent portion. By doing this, the shape of the bent portion does not shift to the electro-optical panel side or to the opposite side, and the entire bent portion can be made uniform. As a result, the length of the bent portion protruding from the liquid crystal panel can be shortened.

  In the electro-optical device according to the aspect of the invention, it is preferable that the linear member is a ground wire. Generally, in a circuit formed on a wiring board, a ground line is formed in order to obtain a reference potential. This ground line is usually formed thicker than other wirings. Providing such a thick wiring in the bent portion of the wiring board is very effective in attaching a bending fold to the bent wiring board.

  In the electro-optical device according to the present invention, a so-called laminated wiring board having a wiring structure on both the front and back surfaces can be used as the wiring board. In this case, it is preferable that the linear member extending substantially parallel to the side edge of the electro-optical panel is formed on a surface of the wiring substrate that is bent and contracted. If it carries out like this, sufficient bending wrinkles can be provided to the bent wiring board.

  In the electro-optical device according to the aspect of the invention, it is preferable that a wiring extending from the wiring board toward the electro-optical panel is formed on a surface of the wiring board that is bent and extends. Here, the wiring extending from the wiring board toward the electro-optical panel is, of course, a wiring having a right-angled positional relationship with respect to the linear member extending substantially parallel to the side edge of the electro-optical panel. It is. If the wiring extending from the wiring board toward the electro-optical panel is provided on the surface of the wiring board that is bent and extended as in this embodiment, the bending wiring board is sufficiently bent. Can be granted.

  Next, a second electro-optical device according to the present invention includes an electro-optical panel including an electro-optical material, and a flexibility that is connected to the electro-optical panel and bent toward the electro-optical panel. A wiring board, and the wiring board includes a plurality of circuit components extending substantially in parallel with a side edge of the electro-optical panel and arranged in a substantially straight line at the bent portion.

  In the above configuration, the plurality of circuit components are components necessary for driving the electro-optical panel, such as an IC, a resistor, a coil, and a capacitor. Conventionally, these circuit components have been provided at any unspecified location on the wiring board. However, in this case, when the wiring board is bent, the circuit component may overlap the electro-optical panel in the thickness direction. In order to compensate for this, at least between the wiring board and the electro-optical panel, The gap beyond the height of the circuit component had to be secured.

  On the other hand, according to the second electro-optical device, a plurality of circuit components are arranged substantially parallel to the side edge of the electro-optical panel and linearly on the bent portion of the wiring board. The circuit component does not overlap the electro-optical panel in the thickness direction of the electro-optical device. For this reason, it is not necessary to secure an unnecessarily large gap in a region where the wiring board and the electro-optical panel overlap, and the gap between the wiring board and the electro-optical panel can be narrowed. As a result, the electro-optical device can be thinly formed.

  In the second electro-optical device, it is preferable that the plurality of circuit components are disposed in a space formed in a bent portion of the wiring board. By doing so, the electro-optical device can be further reduced in size.

  In the second electro-optical device, the wiring board includes a linear member extending between the plurality of circuit components and the electro-optical panel so as to be substantially parallel to a side edge of the electro-optical panel. It is desirable. This embodiment corresponds to an electro-optical device having a configuration in which the first electro-optical device and the second electro-optical device are combined. According to this embodiment, the electro-optical device can be reduced in size from both the lateral projecting dimension and the thickness dimension.

  Further, the second electro-optical device can further include, as components, a light guide disposed substantially parallel to the electro-optical panel, and a light source disposed side by side with the light guide. . In this case, the wiring board can be bent so that the tip of the wiring board contacts the opposite surface of the light emitting surface of the light guide. Further, it is preferable that the plurality of circuit components are arranged in a space formed in a bent portion of the wiring board and adjacent to the light source. By doing so, the electro-optical device can be further reduced in size.

  Next, an electronic apparatus according to the invention includes the electro-optical device having the above-described configuration. In the electro-optical device according to the present invention, the amount of overhang of the bent portion of the flexible wiring board is reduced, or a plurality of circuit components are arranged in a space that can be formed in the bent portion of the wiring board. The overall shape of the device has been reduced. As a result, the electronic apparatus according to the present invention using this electro-optical device can also be reduced in overall size.

(Embodiment of electro-optical device)
A first electro-optical device according to the present invention includes an electro-optical panel including an electro-optical material, and a flexible wiring board that is connected to the electro-optical panel and is bent toward the electro-optical panel. And the wiring board has wiring extending substantially parallel to the side edge of the electro-optical panel at the bent portion.

  In addition, a second electro-optical device according to the present invention includes an electro-optical panel including an electro-optical material, and a flexible wiring connected to the electro-optical panel and bent toward the electro-optical panel. The circuit board includes a plurality of circuit components extending substantially in parallel with the side edges of the electro-optical panel and arranged in a substantially straight line at the bent portion.

  Hereinafter, both the first electro-optical device and the second electro-optical device will be described by taking a liquid crystal display device which is an example of an electro-optical device as an example. In addition, embodiment described below is an example of this invention, Comprising: This invention is not limited. Further, in the following description, the drawings will be referred to as necessary. In this drawing, in order to show the important components of the structure composed of a plurality of components in an easy-to-understand manner, The dimensions are shown.

  FIG. 1 shows an embodiment of a liquid crystal display device which is an electro-optical device according to the present invention. FIG. 2 shows the liquid crystal panel and the wiring board included in the liquid crystal display device of FIG. 1 in an unfolded state. 3 shows an enlarged main cross-sectional structure inside the liquid crystal display device shown in FIG. 2 corresponds to a state in which the liquid crystal panel of FIG. 1 is turned upside down.

  FIG. 1 shows an active matrix transflective liquid crystal display device 1 using a TFD (Thin Film Diode) element, which is a two-terminal nonlinear resistance element. 2, the liquid crystal display device 1 includes a liquid crystal panel 2, a driving IC 3 mounted on the liquid crystal panel 2, an FPC 5 as a flexible wiring board mounted on the liquid crystal panel 2, and a liquid crystal panel. And an illuminating device 4 arranged substantially in parallel to the two. The liquid crystal panel 2, the driving IC 3, the FPC 5, and the lighting device 4 are accommodated in a metal frame 50 in FIG.

  The metal frame 50 is formed by bonding the first metal frame 50a and the second metal frame 50b using an appropriate bonding technique. As such a joining method, for example, a method of forming a fitting structure in advance at appropriate positions of both metal frames 50a and 50b, a method of joining using a fastener such as a screw, or the like can be used. The second metal frame 50b is provided with an opening V0 for visually recognizing a display realized by the liquid crystal panel 2.

  In FIG. 1, the illumination device 4 is disposed on the back side of the liquid crystal panel 2 as viewed from the observation side indicated by the arrow A and functions as a backlight. The illuminating device 4 includes a light guide 7 formed of a translucent resin, and an LED (Light Emitting Diode) 6 serving as a light source disposed to face the light entrance 7a of the light guide 7. Have. A reflective layer 8 is provided on the back side of the light guide 7 as viewed from the observation side, if necessary. A diffusion layer 9 is provided on the observation side of the light guide 7 as necessary.

  As shown in FIG. 2, the LED 6 is mounted on an LED substrate 55 that is a flexible wiring substrate. The LED substrate 55 is formed in an L shape using, for example, FPC, and the LED 6 is mounted on the long side portion of the L shape. In the present embodiment, four LEDs 6 are provided at equal intervals. In addition, a buffer member 56 made of a resin such as acrylic or urethane is provided on the back surface of the LED substrate 55 on which the LED 6 is provided. In FIG. 1, the buffer member 56 prevents the LED board 55 from coming into contact with other components, and allows the LED 6 to be positioned at a predetermined position with respect to the light inlet 7a of the light guide 7. It has a function of pressing the LED 6. The light generated from the LED 6 is introduced into the light guide 7 through the light entrance 7a, travels through the light guide 7, and then exits from the light exit 7b as planar light. The light source can also be constituted by a point light source other than the LED 6 or a linear light source such as a cold cathode tube.

  As shown in FIG. 2, the liquid crystal panel 2 includes an element substrate 12, a color filter substrate 11 facing the element substrate 12, and a square or rectangular frame-shaped sealing material 13 to which the substrates are bonded. In FIG. 3, a liquid crystal layer is formed by sealing liquid crystal 14 as an electro-optical material in a gap sandwiched between the color filter substrate 11 and the element substrate 12, that is, a so-called cell gap G.

  In FIG. 1, the color filter substrate 11 includes a first light-transmitting substrate 16 a that is rectangular or square when viewed from the direction of arrow A. The first translucent substrate 16a is made of, for example, translucent glass, translucent plastic, or the like. In addition, a retardation plate 26a and a polarizing plate 27a are respectively attached to the outer surface of the first light transmitting substrate 16a by sticking or the like.

  In FIG. 3, a resin layer 17 is formed on the inner surface of the first translucent substrate 16a, a reflective layer 18 is formed thereon, and a plurality of coloring elements 19 and a light shielding member 21 surrounding them are formed thereon. An overcoat layer 22 is formed thereon, a plurality of strip electrodes 23a extending linearly in the direction perpendicular to the paper surface are formed thereon, and an alignment film 24a is further formed thereon. The alignment film 24a is subjected to an alignment process such as a rubbing process, whereby the alignment of liquid crystal molecules in the vicinity of the color filter substrate 11 is determined.

  An uneven shape is formed on the surface of the resin layer 17. For this reason, the reflective layer 18 laminated | stacked on the resin layer 17 has the same uneven | corrugated shape. Due to this uneven shape, the light reflected by the reflective layer 18 diffuses. The reflective layer 18 is made of, for example, Al (aluminum), Al alloy, or the like. In addition, when it is desired to smooth the uneven shape formed on the surface of the resin layer 17, the resin layer 17 is formed by a two-layer structure of the first layer and the second layer, and a rough uneven shape is formed on the surface of the first layer. In addition, a method of laminating the second layer thereon to smooth the uneven shape can also be used.

  For example, each of the coloring elements 19 is formed in a rectangular dot shape when viewed from the direction of the arrow A, and each coloring element 19 has three primary colors of R (red), G (green), and B (blue). It is formed of any one material that transmits light. The coloring elements 19 of these colors are arranged so as to form a stripe arrangement, a delta arrangement, a mosaic arrangement, and other appropriate arrangements when viewed from the direction of the arrow A. The coloring element 19 can also be formed by three primary colors of C (cyan), M (magenta), and Y (yellow).

  The light shielding member 21 is formed so as to fill a space between the plurality of coloring elements 19 with a light shielding material such as Cr (chromium). The light shielding member 21 functions as a black matrix and improves the contrast of an image displayed by light transmitted through the coloring elements 19. The light shielding member 21 is not limited to being formed of a specific material such as Cr, but can be formed by overlapping, that is, laminating, the R, G, and B coloring elements that constitute the coloring element 19.

  The overcoat layer 22 is formed of a photosensitive resin such as an acrylic resin or a polyimide resin. The plurality of strip electrodes 23a are formed of a metal oxide such as ITO (Indium Tin Oxide). Further, the alignment film 24a formed thereon is formed of polyimide or the like, for example.

  In FIG. 1, the element substrate 12 facing the color filter substrate 11 has a second light-transmitting substrate 16b. The second light transmissive substrate 16b is formed of, for example, light transmissive glass, light transmissive plastic, or the like. A phase difference plate 26b and a polarizing plate 27b are attached to the outer surface of the second light transmissive substrate 16b by sticking or the like, respectively.

  Returning to FIG. 3, line wiring 33 is formed on the inner surface of the second translucent substrate 16 b, and a plurality of TFD elements 31, which are two-terminal type non-linear resistance elements functioning as switching elements, are connected to the line wiring 33. Connected to and formed. Further, a plurality of dot electrodes 23 b are formed so as to be connected to those TFD elements 31. The line wiring 33 extends on the color filter substrate 11 in a direction perpendicular to the strip electrode 23a, that is, in the left-right direction in FIG.

  A plurality of photo spacers 15 are formed between the dot electrodes 23b, and an alignment film 24b is formed thereon. These photo spacers 15 are formed, for example, by patterning a photosensitive resin by a photolithography process. The photo spacer 15 is formed in a standing cylindrical shape, and functions so that the cell gap G maintains a uniform dimension. The alignment film 24b is subjected to an alignment process such as a rubbing process, whereby the alignment of liquid crystal molecules in the vicinity of the element substrate 12 is determined. The dot electrode 23b is formed of a metal oxide such as ITO. The alignment film 24b is formed of, for example, polyimide.

  Each of the plurality of linear line wirings 33 provided on the element substrate 12 extends in the left-right direction in the figure, and is provided in a stripe shape as a whole. The plurality of TFD elements 31 are connected to the individual line wirings 33 at appropriate intervals, and the dot electrodes 23 b are connected to the TFD elements 31. Each TFD element 31 is provided at a position corresponding to the light shielding member 21 on the color filter substrate 11 side.

  Further, the plurality of strip electrodes 23a provided on the color filter substrate 11 facing the element substrate 12 each extend in a direction perpendicular to the drawing sheet and are formed in a stripe shape as a whole. These band-like electrodes 23a extend in a direction perpendicular to the line wiring 33 when the color filter substrate 11 and the element substrate 12 are bonded together by the sealing material 13 (see FIG. 2). Each strip electrode 23a overlaps with a plurality of dot electrodes 23b arranged in a row in a plane. Thus, the region where the belt-like electrode 23a and the dot electrode 23b overlap constitutes the display dot region D which is the minimum unit of display. The plurality of display dot areas D are arranged in a matrix in the vertical direction and the horizontal direction, and an image such as a character, number, figure, or the like is formed in an area formed by the plurality of display dot areas D, that is, an effective display area. Is displayed.

  As in the present embodiment, one pixel is formed by the three display dot regions D corresponding to the three coloring elements 19 corresponding to the three colors R, G, and B. On the other hand, when monochrome display is performed in black and white or any one color, one pixel is formed by one display dot region D.

  The reflective layer 18 is provided with openings 46 corresponding to the individual display dot regions D. These openings 46 are formed in a rectangular shape when viewed from the direction of arrow A. In each display dot region D, a portion R where the reflective layer 18 is provided is a reflective portion, and a portion T where the opening 46 is formed is a transmissive portion. External light incident from the observation side, that is, external light Lo incident from the element substrate 12 side is reflected by the reflection portion R. On the other hand, the light Ls emitted from the light guide 7 of the illumination device 4 in FIG. 1 passes through the transmission part T in FIG.

  In FIG. 1, the second light transmissive substrate 16 b constituting the element substrate 12 has a protruding portion 29 that projects outward from the first light transmissive substrate 16 a constituting the color filter substrate 11 that is the counter substrate. As shown in FIG. 2, on the surface of the overhanging portion 29 on the color filter substrate 11 side, three driving ICs 3 are provided with COG (Anisotropic Conductive Film) 57 using, for example, an ACF (Anisotropic Conductive Film) 57. Chip On Glass) technology. These driving ICs 3 are constituted by a driving IC 3a that outputs a scanning signal and a driving IC 3b that outputs a data signal. These driving ICs 3 may be configured to output a scanning signal and a data signal by one driving IC.

  An external connection terminal 58 is formed at the end of the overhang portion 29. The external connection terminal 58 is connected to an input terminal of the driving IC 3, for example, an input bump. Further, the FPC 5 that is a flexible wiring board is connected to the external connection terminal 58 by, for example, an ACF 57. For the connection between the FPC 5 and the external connection terminal 58, a conductive connection method such as soldering or heat sealing can be used.

  The FPC 5 is a substrate excellent in bendability formed using, for example, a film made of polyimide, polyester, or the like as a base material. The FPC 5 has a surface S1 which is bent as indicated by an arrow C in FIG. 2 and faces the liquid crystal panel 2, and a surface S2 which is the opposite surface. The FPC 5 includes a circuit forming portion 5a, an input terminal 5b, a bent portion 5c, an output terminal 5d, and an LED board connecting terminal 5e. The circuit forming part 5a is a part for forming an electronic circuit. The bent portion 5c is a portion that bends when the FPC 5 is bent as indicated by an arrow C. The LED board 55 is connected to the LED board connection terminal 5e by soldering, for example. The input terminal 5b is connected to a control circuit, a power source and the like provided in an electronic device such as a mobile phone or a portable information terminal.

  In the present embodiment, an FPC having a two-layer wiring structure is used as the FPC 5. Accordingly, the circuit forming portion 5a is formed between the surface S1 and the surface S2, and electrical conduction is established between these surfaces by through holes as necessary. A plurality of circuit components 51 necessary for driving the liquid crystal panel 2 are mounted on the circuit forming portion 5a on the surface S1 side, and a power source for supplying electric power for driving these circuit components 51 The IC 53 is mounted, and a plurality of wirings that connect the circuit components 51 to form a circuit are formed by patterning. The plurality of circuit components 51 are arranged near the bent portion 5c of the circuit forming portion 5a and arranged in a straight line substantially parallel to the side edge of the element substrate 12, that is, the side edge of the liquid crystal panel 2.

  The power supply IC 53 is mounted on the same straight line as the plurality of circuit components 51 arranged in a straight line, using the ACF 57 at the corner of the circuit forming part 5a. A notch B is formed between the circuit forming portion 5a and the bent portion 5c where the power supply IC 53 is mounted as shown in FIG. By providing this notch B, when the FPC 5 is bent at the bent portion 5c, the circuit forming portion 5a where the power supply IC 53 is mounted has a planar shape without being affected by the bent state of the bent portion 5c. maintain. For this reason, the inconvenience that the power supply IC 53 is peeled off from the FPC 5 does not occur. Further, the bent portion 5c can be bent without being affected by the power supply IC 53.

  The surface S1 of the bent portion 5c is a surface that contracts when bent. On the other hand, the surface S2 on the opposite side of the bent portion 5c is a surface on the side that extends when bent. On the contraction side surface S1 of the bent portion 5c, a wiring 52 as a linear member is formed substantially parallel to the side edge of the liquid crystal panel 2. The wiring 52 is formed in a linear pattern. Further, the wiring 52 functions as a GND line of an electronic circuit formed on the circuit forming portion 5a, that is, a ground line. In general, the ground line has a larger line width than other wirings. The linear wiring 52 is formed on the bent portion 5 c at a substantially central position between the boundary line between the circuit forming portion 5 a and the bent portion 5 c and the side edge of the liquid crystal panel 2.

  A plurality of wirings 54 extending from the circuit forming portion 5a toward the liquid crystal panel 2 are provided on the extension-side surface S2 of the bent portion 5c. These wirings 54 extend in a direction perpendicular to the grounding wiring 52 formed on the contraction-side surface S1. Further, these wirings 54 are wirings for transmitting the output signal of the electronic circuit on the circuit forming portion 5a to the output terminal 5d. The signal transmitted to the output terminal 5d is transmitted to the driving IC 3 through the external connection 58 of the liquid crystal panel 2.

  When assembling the liquid crystal display device 1 shown in FIG. 1 using the liquid crystal panel 2, the driving IC 3, the FPC 5, the LED substrate 55, and the light guide 4 of FIG. 2, first, the driving IC 3 is attached to the overhanging portion of the liquid crystal panel 2. The phase difference plates 26a and 26b and the polarizing plates 27a and 27b shown in FIG. Next, the FPC 5 is connected to the portion of the overhanging portion 29 of the liquid crystal panel 2 where the external connection terminal 58 is provided, and the LED substrate 55 is connected to the LED substrate connection terminal 5 e of the FPC 5.

  Next, the light guide 7 is placed on the color filter substrate 11 side of the liquid crystal panel 2, and the FPC 5 is moved upward as shown by an arrow C in FIG. Bend until. At this time, the FPC 5 bends at the bent portion 5c. In FIG. 1, the first metal frame 50a is assembled to the liquid crystal panel 2 from the light guide 7 side, and the second metal frame 50b is assembled to the liquid crystal panel 2 from the element substrate 12 side of the liquid crystal panel 2. The frames 50a and 50b are combined using an appropriate connection method to form one metal frame 50. Thus, the liquid crystal panel 2, the lighting device 4, and the FPC 5 are accommodated in the metal frame 50 in a predetermined positional relationship, and the liquid crystal display device 1 is manufactured.

  When the first metal frame 50a and the second metal frame 50b are combined, the entire liquid crystal panel 2 is held between the metal frames 50a and 50b with a predetermined pressure so as not to be displaced. The LED 6 is held between the first metal frame 50a and the second metal frame 50b with a predetermined pressure with the buffer material 56 and the overhanging portion 29 of the liquid crystal panel 2 interposed therebetween, and is held so as not to be displaced. Accordingly, the LED 6 is accurately placed at a predetermined position with respect to the light entrance 7 a of the light guide 7. Further, in FIG. 2, a plurality of circuit components 51 mounted near the bent portion 5 c of the circuit forming portion 5 a of the FPC 5 are spaces formed by bending the FPC 5, and the liquid crystal panel 2 is sandwiched between the LEDs 6. Stored in the opposite position.

  The liquid crystal display device 1 manufactured as described above can selectively execute reflection type display and transmission type display. In the case where reflection type display is performed, in FIG. The external light Lo is reflected by the reflecting portion R and supplied to the liquid crystal layer 14. On the other hand, when the transmissive display is performed, the illumination device 4 in FIG. 1 is turned on, and planar light emitted from the light guide 7 is supplied to the liquid crystal layer 14 through the transmissive portion T in FIG.

  While light is supplied to the liquid crystal layer 14 in this way, a scanning signal is applied to one of the strip electrode 23 a and the dot electrode 23 b that sandwich the liquid crystal layer 14, and a data signal is applied to the other, thereby applying to the liquid crystal layer 14. The electric field is controlled for each display dot region D. By this voltage control, the light passing through the liquid crystal layer 14 is modulated for each display dot region D, and this modulated light is applied to the inside of the polarizing plate 27b, so that the outside of the polarizing plate 27b, that is, the observation is observed. On the side, images such as letters, numbers, figures, etc. are displayed. The display thus obtained is visually recognized by the observer from the direction of arrow A through the opening V0 of the second metal frame 50b in FIG.

  By the way, in order to reduce the size of the liquid crystal display device 1, it is desirable to shorten the length X of the bent portion 5c projecting outside the liquid crystal panel 2 in FIG. However, if an ordinary FPC that has not been taken any measures is used as the FPC 5, when the overhang length X is short, the FPC 5 is connected to the liquid crystal panel 2 at the connection portion between the FPC 5 and the liquid crystal panel 2 due to the elasticity of the FPC 5. May peel off from the liquid crystal panel 2. Further, there is a possibility that the circuit component mounted in the vicinity of the bent portion of the FPC 5 is peeled off from the FPC 5. For these reasons, when the FPC 5 is formed using a normal FPC, the overhang length X cannot be reduced, and therefore the length in the width direction of the liquid crystal display device 1 must be increased.

  In this regard, in the present embodiment, as shown in FIG. 2, the wiring 52 substantially parallel to the side edge of the liquid crystal panel 2 is formed on the bent portion 5 c of the FPC 5. For this reason, when the FPC 5 is bent, a bending wrinkle is given to the bent portion 5c. Because of this bending wrinkle, even if the overhang length X of the bent portion 5c when the FPC 5 is bent is reduced, the FPC 5 is hardly peeled off from the liquid crystal panel 2 at the beginning of the bent portion 5c. Further, for the same reason, the circuit component mounted in the vicinity of the bent portion of the bent portion 5c is hardly peeled off from the FPC 5. For these reasons, in this embodiment, the overhanging length X of the bent portion 5c of the FPC 5 can be reduced, and therefore the lateral length of the liquid crystal display device 1 can be reduced.

  In particular, in the present embodiment, since the wiring 52 has a linear pattern and is not a curved shape or a stepped shape, an effective bending wrinkle is given to the FPC 5. Moreover, in this embodiment, the wiring 52 was formed so that it might be located in the top part of the bending part 5c. For this reason, since the shape of the bending part 5c does not shift to the connection part side of the FPC 5 and the liquid crystal panel 2 or to the opposite side, the entire bending part 5c can be made into a uniform shape. The overhang length X can be further shortened from the liquid crystal panel 2 of 5c.

  Moreover, in this embodiment, the wiring 52 provided in the bending part 5c was used as the ground line of the electronic circuit. In general, the ground wire is thicker than the other wires. When the bent portion 5c is bent, the thick wiring can be provided with a strong bend that is desirable to prevent the FPC 5 from being peeled off from the liquid crystal panel 2 and the circuit components from being peeled off from the FPC 5.

  In the present embodiment, a two-layer wiring board is used as the FPC 5. And the wiring 52 extended substantially parallel to the edge of the liquid crystal panel 2 was formed in the surface S1 of the side of the FPC 5 which is bent and contracted. This wiring structure prevents the FPC 5 from being peeled off from the liquid crystal panel 2 at the beginning of the bent portion 5c, and further prevents the circuit component 51 from being peeled off from the FPC 5 at the beginning of the bent portion 5c of the FPC 5. Therefore, it is a very preferable wiring structure.

  In the present embodiment, in FIG. 2, the wiring 54 extending from the FPC 5 toward the liquid crystal panel 2 is provided on the surface S <b> 2 on the side of the FPC 5 that is bent and extended. In this way, compared to the case where the wiring 54 is provided on the contraction-side surface S1 of the bent portion 5c, a sufficient bending fold can be given to the bent portion 5c of the FPC 5.

  In the present embodiment, a plurality of circuit components 51 that extend substantially parallel to the side edges of the liquid crystal panel 2 and are arranged in a substantially straight line are mounted at the bent portion 5 c of the FPC 5. Therefore, the circuit component 51 does not overlap the liquid crystal panel 2 in the thickness direction of the liquid crystal display device 1, and it is not necessary to secure an unnecessarily large gap in the region where the FPC 5 and the liquid crystal panel 2 overlap. It became possible to narrow the gap with. As a result, the thickness direction of the liquid crystal display device 1 can be formed thin.

  In the present embodiment, as shown in FIG. 1, a plurality of circuit components 51 are accommodated in a space formed in the bent portion of the FPC 5. Thereby, the dimension of the thickness direction of the liquid crystal display device 1 can be further reduced.

(Modification)
A first electro-optical device according to the present invention includes an electro-optical panel including an electro-optical material, and a flexible wiring board that is connected to the electro-optical panel and is bent toward the electro-optical panel. And the wiring board has wiring extending substantially parallel to the side edge of the electro-optical panel at the bent portion.

  According to the present invention, in the above embodiment, it is an indispensable component requirement to provide the wiring 52 at the bent portion 5c of the FPC 5 as shown in FIG. 2, but the circuit component 51 is connected to the FPC 5 as shown in FIG. The mounting at the bent portion 5c is not necessarily performed.

  In addition, a second electro-optical device according to the present invention includes an electro-optical panel including an electro-optical material, and a flexible wiring connected to the electro-optical panel and bent toward the electro-optical panel. The circuit board includes a plurality of circuit components extending substantially in parallel with the side edges of the electro-optical panel and arranged in a substantially straight line at the bent portion.

  According to the present invention, in the above embodiment, it is an indispensable component to mount the circuit component 51 at the bent portion 5c of the FPC 5 as shown in FIG. 1, but as shown in FIG. It is not always necessary to provide the wiring 52 at the bent portion 5c.

(Other embodiments)
The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the embodiments, and various modifications can be made within the scope of the invention described in the claims.

  For example, in each of the embodiments described above, the present invention is applied to a transflective liquid crystal display device. However, the present invention is a liquid crystal display device that performs only a reflective display and a liquid crystal display that performs only a transmissive display. Applicable to any of the devices.

  In each of the above embodiments, the present invention is applied to a liquid crystal display device using a TFD element. However, the present invention is also applied to an active matrix liquid crystal display device using a two-terminal switching element other than a TFD element. Applicable. The present invention can also be applied to an active matrix liquid crystal display device using a three-terminal switching element such as a TFT (Thin Film Transistor). The present invention can also be applied to a simple matrix liquid crystal display device that does not use a switching element.

  The present invention also relates to an electro-optical device other than a liquid crystal display device, such as an organic EL (Electro Luminescence) device, an inorganic EL device, a plasma display device (PDP), an electrophoretic display (EPD), a field The present invention can also be applied to an emission display device (FED: Field Emission Display) LED display device and DMD (Digital Micromirror Device).

(Embodiment of electronic device)
Next, an embodiment of an electronic device according to the present invention will be described with reference to the drawings. FIG. 4 shows a block diagram of an embodiment of an electronic apparatus according to the present invention. The electronic apparatus shown here includes the liquid crystal display device 1 and a control circuit 70 that controls the liquid crystal display device 1. The liquid crystal display device 1 includes a liquid crystal panel 71 and a drive circuit 72 composed of a semiconductor IC or the like. The control circuit 70 includes a display information output source 73, a display information processing circuit 74, a power supply circuit 76, and a timing generator 77.

  The display information output source 73 includes a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), a storage unit such as a magnetic recording disk or an optical recording disk, and a tuning circuit that tunes and outputs a digital image signal. Have The display information output source 73 supplies display information to the display information processing circuit 74 in the form of an image signal or the like in a predetermined format based on various clock signals generated by the timing generator 77.

  The display information processing circuit 74 includes various known circuits such as a serial-parallel conversion circuit, an amplification / inversion circuit, a rotation circuit, a gamma correction circuit, and a clamp circuit, and executes processing of input display information to obtain image information thereof. Are supplied to the drive circuit 72 together with the clock signal CLK. The drive circuit 72 includes a scanning line drive circuit, a data line drive circuit, and an inspection circuit. The power supply circuit 76 supplies a predetermined voltage to each of the above components.

  The liquid crystal display device 1 can be constituted by, for example, the liquid crystal display device 1 shown in FIG. In the liquid crystal display device 1, since the linear pattern-like wiring 52 is formed in the bent portion 5 c of the FPC 5, the overhang dimension of the bent portion 5 c of the FPC 5 can be formed small. Further, since the liquid crystal display device 1 is provided with the circuit component 51 in a straight line at the bent portion 5c, the device can be formed thin. Therefore, the electronic apparatus using this can also be reduced in size.

  FIG. 5 shows an embodiment in which the present invention is applied to a mobile phone which is an example of an electronic apparatus. A cellular phone 80 shown here has a main body portion 81 and a display body portion 82 provided on the main body portion 81 so as to be opened and closed. A display device 83 configured by an electro-optical device such as a liquid crystal display device is disposed inside the display body portion 82, and various displays relating to telephone communication can be visually recognized on the display body portion 82 on the display screen 84. Operation buttons 86 are arranged on the main body 81.

  An antenna 87 is attached to one end of the display body portion 82 so as to be extendable. A speaker (not shown) is arranged inside the receiver unit 88 provided at the upper part of the display body unit 82. In addition, a microphone (not shown) is incorporated in the transmitter 89 provided at the lower end of the main body 81. A control unit for controlling the operation of the display device 83 is stored in the main body 81 or the display body unit 82 as a part of the control unit that controls the entire mobile phone or separately from the control unit. The

  The display device 83 can be configured by, for example, the liquid crystal display device 1 shown in FIG. In the liquid crystal display device 1, since the linear pattern-like wiring 52 is formed in the bent portion 5 c of the FPC 5, the overhang dimension of the bent portion 5 c of the FPC 5 can be formed small. Further, since the liquid crystal display device 1 is provided with the circuit component 51 in a straight line at the bent portion 5c, the device can be formed thin. Therefore, the cellular phone 80 of FIG. 5 using this can also be reduced in size.

(Modification)
In addition to the mobile phone described above, the electronic device according to the present invention includes a personal computer, a liquid crystal television, a digital still camera, a wristwatch, a viewfinder type or a monitor direct view type video tape recorder, a car navigation device, a pager, An electronic notebook, a calculator, a word processor, a workstation, a video phone, a POS terminal, and other various devices can be considered.

1 is a cross-sectional view of a liquid crystal display device showing an embodiment of an electro-optical device according to the invention. FIG. 2 is a perspective view showing the liquid crystal display device of FIG. 1 in an unfolded state. It is sectional drawing which expands and shows the principal part of FIG. It is a block diagram which shows one Embodiment of the electronic device which concerns on this invention. It is a perspective view which shows other embodiment of the electronic device which concerns on this invention.

Explanation of symbols

1. 1. liquid crystal display device (electro-optical device), LCD panel (electro-optical panel),
3. Driving IC, 4. 4. lighting device; FPC (wiring board), 5a. Circuit forming section, 5b. Input terminal, 5c. Bent part, 5d. Output terminal,
5e. 5. LED board connection terminal LED, 7. Light guide,
7a. 7. Light incident surface of the light guide; A reflective layer, 9. 11. diffusion layer; Color filter substrate, 12. Element substrate, 14. Liquid crystal, 15. Photo spacer,
16a, 16b. Translucent substrate, 17. Resin layer, 18. Reflection layer, 19. Coloring elements, 21. Light shielding member, 22. Overcoat layer, 23a. Strip electrode,
23b. Dot electrodes, 24a, 24b. Alignment films, 26a, 26b. Retardation plate,
27a, 27b. Polarizing plate, 29. Overhang, 31. TFD element,
33. Line wiring, 46. Opening, 51. Circuit components,
52. Grounding wire (linear member), 53. IC for power supply, 55. LED board,
56. Buffer member, 57. ACF, 58. External connection terminal,
80. Mobile phone (electronic device), 83. Liquid crystal display device; Display dot area,
Lo. External light, Ls. Transmitted light; Reflector, T. Transmission part, S1. Front side,
S2. Back side, X. Bending length

Claims (11)

An electro-optic panel containing an electro-optic material;
A flexible wiring board connected to the electro-optical panel and bent toward the electro-optical panel;
The wiring board includes a linear member extending substantially parallel to a side edge of the electro-optical panel at the bent portion.   2. The electro-optical device according to claim 1, wherein the linear member is a linear pattern.   3. The electro-optical device according to claim 1, wherein the linear member is positioned substantially at a top of the bent portion. 4.   4. The electro-optical device according to claim 1, wherein the linear member is a grounding wire for driving the electro-optical panel. 5. The electro-optical device according to any one of claims 1 to 4,
The wiring board has wiring on both front and back sides,
The electro-optical device, wherein the linear member extending substantially parallel to a side edge of the electro-optical panel is formed on a surface of the wiring board on a side that is bent and contracted.   6. The electro-optical device according to claim 5, wherein a wiring extending from the wiring board toward the electro-optical panel is formed on a surface of the wiring board that is bent and extends. Optical device. An electro-optic panel containing an electro-optic material;
A flexible wiring board connected to the electro-optical panel and bent toward the electro-optical panel;
2. The electro-optical device according to claim 1, wherein the wiring board has a plurality of circuit components extending substantially parallel to the side edge of the electro-optical panel and arranged in a substantially straight line at the bent portion.   8. The electro-optical device according to claim 7, wherein the plurality of circuit components are arranged in a space formed in a bent portion of the wiring board. The electro-optical device according to claim 7 or 8,
The electro-optical device, wherein the wiring board includes a linear member extending substantially parallel to a side edge of the electro-optical panel between the plurality of circuit components and the electro-optical panel. The electro-optical device according to any one of claims 7 to 9,
A light guide disposed substantially parallel to the electro-optical panel;
A light source disposed side by side with the light guide;
The wiring board is bent and its tip contacts the opposite surface of the light emitting surface of the light guide,
The electro-optical device, wherein the plurality of circuit components are arranged in a space formed in a bent portion of the wiring board and adjacent to the light source. An electronic apparatus comprising the electro-optical device according to claim 1.

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