JP2007248718A - Electrooptical device, method for manufacturing same, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical device in which a printing area of product identification information can be sufficiently secured even when a panel is miniaturized, a connection defect between a flexible circuit board and an electronic component due to the printing of the product identification information is not easily generated and combination between ink to be used for printing and a flexible circuit board is not restricted. <P>SOLUTION: The electrooptical device 1 comprises a connection terminal 19 formed on an electrooptical panel 2, a flexible circuit board 3 electrically connected to the connection terminal 19 and a fixing tape 50 for fixing the flexible circuit board 3. The product identification information of the electrooptical device is printed on the fixing tape 50. The end part of the flexible circuit board 3, which is the opposite side to the side electrically connected to the connection terminal 19, is arranged in an area superposed to the electrooptical panel 2 and fixed from the side of the flexible circuit board 3, which is opposed to a surface faced to the electrooptical panel 2, to the electrooptical panel 2 side by the fixing tape 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electro-optical device, a method for manufacturing the electro-optical device, and an electronic apparatus.

  Currently, liquid crystal devices are widely used as display devices for electronic devices such as mobile phones. The liquid crystal device generally includes a liquid crystal panel, a flexible printed circuit (FPC), and a backlight. As the flexible circuit board, a metal wiring made of a copper thin film or the like is formed on a polyimide film as a base substrate, and an electronic component such as a driving IC is mounted on the metal wiring. On the flexible circuit board, a plurality of light emitting diodes (LEDs) that are light sources of the backlight are mounted. Then, the light source is arranged on the incident end face of the light guide plate by bending the flexible circuit board toward the light guide plate side of the backlight.

  In such a liquid crystal device, it is necessary to align the light source and the light guide plate with high precision so that the light from the light source is uniformly incident on the liquid crystal panel. In this case, since the light source and the light guide plate cannot be directly fixed with an adhesive or the like, conventionally, a double-sided adhesive sheet is disposed between the light guide plate and the flexible circuit board, and the flexible circuit board is disposed on the back surface of the light guide plate. Both were fixed by bonding (for example, refer to Patent Document 1). In this liquid crystal device, after connecting the flexible circuit board and the liquid crystal panel, the flexible circuit board is bent toward the light guide plate so that the light guide plate is wound inside. Then, each light source mounted on the flexible circuit board is opposed to the incident end face of the light guide plate, and after both are accurately aligned, the flexible circuit board is further bent to the back side of the light guide plate, and a double-sided adhesive sheet is used. Fix it.

However, the double-sided adhesive sheet cannot exhibit a sufficient adhesive force for a while after being bonded. Further, since the flexible circuit board itself has a certain degree of rigidity, the flexible circuit board is easily peeled off from the light guide plate immediately after being bonded with the double-sided adhesive sheet. Therefore, conventionally, in order to prevent such peeling of the double-sided adhesive sheet immediately after bonding, a fixing tape is further applied from above the portion where the flexible circuit board and the light guide plate are bonded to each other. The method of fixing to heavy is adopted.
JP 2005-17613 A

  By the way, information such as product number, version information, date of manufacture, current factory, and current time is printed on the liquid crystal device as product identification information. This product identification information is printed on the back surface of the liquid crystal device (that is, the back surface of the light guide plate) using a print stamp or the like. In the conventional liquid crystal device, since the size of the liquid crystal panel is large, printing is performed in an area where the flexible circuit board is not disposed. However, in recent liquid crystal devices that require miniaturization, such a printing area cannot be secured sufficiently, so a method of directly printing on the surface of the flexible circuit board fixed to the back surface of the light guide plate is adopted. Has been.

  However, since a large number of electronic components are mounted on the flexible circuit board, if mechanical pressure is applied from the back side by a printing stamp, the terminals of the electronic component and the flexible circuit board may be peeled off, resulting in poor connection. is there. In addition, when printing directly on a flexible circuit board, depending on the type of ink, a chemical reaction may occur with the polyimide film that is the base substrate, and a compound that does not conform to ISO (International Organization for Standardization) standards may be generated. . Such a problem is not limited to the liquid crystal device, and is a common problem in other electro-optical devices (for example, organic electroluminescence devices) that bend and fix the flexible circuit board.

  The present invention has been made in view of such circumstances, and even when the panel is downsized, a sufficient area for printing product identification information can be secured, and a flexible circuit board by printing product identification information. It is an object of the present invention to provide an electro-optical device and a method for manufacturing the same, which are less likely to cause poor connection between the electronic component and the electronic component, and are not limited by the combination of ink used for printing and a flexible circuit board. It is another object of the present invention to provide an electronic apparatus that is easy to downsize and excellent in reliability by including such an electro-optical device.

In order to solve the above problems, an electro-optical device of the present invention includes a connection terminal provided in an electro-optical panel, a flexible circuit board electrically connected to the connection terminal, and a fixing for fixing the flexible circuit board. The fixing tape is made of a printable material, product identification information of the electro-optical device is printed on the fixing tape, and the flexible circuit board Is arranged in a region overlapping with the electro-optical panel, and is fixed to the electro-optical panel side from the side opposite to the surface facing the electro-optical panel of the flexible circuit board by the fixing tape. Features.
According to this configuration, since the product identification information is printed on the fixing tape, a sufficient print area can be secured even when the size of the electro-optical device is small. In addition, if product identification information is printed on the fixing tape and then pasted on the flexible circuit board, connection failure does not occur in the electronic components mounted on the flexible circuit board due to the mechanical pressure due to printing. Further, since printing is not performed directly on the flexible circuit board, an undesired compound (for example, a compound that does not meet ISO standards) is not generated by a chemical reaction between the flexible circuit board and the printing ink.

In the present invention, an adhesive is provided between the flexible circuit board and a surface of the flexible board facing the electro-optical panel, and the flexible circuit board is fixed to the electro-optical panel side by the adhesive. It is desirable.
According to this configuration, the flexible circuit board can be double-fixed with the adhesive and the fixing tape, and therefore, the flexible circuit board is less likely to be peeled off or displaced.

The electro-optical device manufacturing method of the present invention includes a connection terminal provided on an electro-optical panel, a flexible circuit board electrically connected to the connection terminal, and a fixing tape for fixing the flexible circuit board. A method of manufacturing an electro-optical device, the step of printing product identification information of the electro-optical device on the fixing tape, the step of electrically connecting the flexible circuit board to the connection terminal, and the flexible Arranging the circuit board in a region overlapping the electro-optical panel and fixing the flexible circuit board to the electro-optical panel side from the opposite side of the surface facing the electro-optical panel of the flexible circuit board; It is characterized by having.
According to this method, since the product identification information is printed on the fixing tape, a sufficient print area can be secured even when the size of the electro-optical device is small. In addition, since product identification information is printed on the fixing tape and then stuck on the flexible circuit board, connection failure does not occur in the electronic components mounted on the flexible circuit board due to mechanical pressure due to printing. Furthermore, since printing is not directly performed on the flexible circuit board, an undesired compound is not generated by a chemical reaction between the flexible circuit board and the printing ink.

The electro-optical device manufacturing method of the present invention includes a connection terminal provided on an electro-optical panel, a flexible circuit board electrically connected to the connection terminal, and a fixing tape for fixing the flexible circuit board. A method of electrically connecting the flexible circuit board to the connection terminal, and arranging the flexible circuit board in a region overlapping the electro-optic panel, and using the fixing tape The step of fixing the flexible circuit board to the electro-optical panel side from the side opposite to the surface facing the electro-optical panel, and printing the product identification information of the electro-optical device on the fixing tape by a droplet discharge method And a step of performing.
According to this method, since the product identification information is printed on the fixing tape, a sufficient print area can be secured even when the size of the electro-optical device is small. Further, since the product identification information is printed by the droplet discharge method, the connection failure is less likely to occur in the electronic component mounted on the flexible circuit board as compared with the case of printing by a mechanical printing method such as a stamp. Furthermore, since printing is not directly performed on the flexible circuit board, an undesired compound is not generated by a chemical reaction between the flexible circuit board and the printing ink.

The electro-optical device manufacturing method of the present invention includes a connection terminal provided on an electro-optical panel, a flexible circuit board electrically connected to the connection terminal, and a fixing tape for fixing the flexible circuit board. A method of electrically connecting the flexible circuit board to the connection terminal, and arranging the flexible circuit board in a region overlapping the electro-optic panel, and using the fixing tape The step of fixing the flexible circuit board to the electro-optical panel side from the side opposite to the surface facing the electro-optical panel, and the electronic component mounted on the flexible circuit board on the fixing tape in plan view And a step of printing product identification information of the electro-optical device in a non-overlapping region.
According to this method, since the product identification information is printed on the fixing tape, a sufficient print area can be secured even when the size of the electro-optical device is small. In addition, since product identification information is printed in an area other than the mounting area of the electronic component, poor connection is unlikely to occur in the electronic component mounted on the flexible circuit board even when printed by a mechanical printing method such as a stamp. . Furthermore, since printing is not directly performed on the flexible circuit board, an undesired compound is not generated by a chemical reaction between the flexible circuit board and the printing ink.

In the present invention, before the flexible circuit board is fixed by the fixing tape, the flexible circuit board is formed by an adhesive provided between the flexible circuit board and a surface of the flexible board facing the electro-optical panel. Is preferably fixed to the electro-optical panel side.
According to this method, the flexible circuit board can be double-fixed with the adhesive and the fixing tape, so that the flexible circuit board is more unlikely to be peeled off or displaced.

An electronic apparatus according to the present invention includes the electro-optical device of the present invention described above or the electro-optical device manufactured by the method of manufacturing the electro-optical device of the present invention described above.
According to this configuration, it is possible to provide an electronic device that is easily downsized and excellent in reliability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, a liquid crystal device, specifically, a reflective transflective passive matrix liquid crystal device will be described as an example of an electro-optical device, but the present invention is not limited to this. In the following drawings, an XYZ coordinate system is used in which the directions parallel to the display surface of the liquid crystal device are the X-axis direction and the Y-axis direction, and the direction perpendicular thereto is the Z-axis direction. The X-axis direction and the Y-axis direction coincide with the extending directions of the common electrode and the segment electrode, respectively, and the Z-axis direction coincides with the direction in which light from the illumination device is emitted (observation direction). Furthermore, in order to make each configuration easy to understand, the actual structure and the scale and number of each structure are different.

[Configuration of liquid crystal device]
1 is a schematic perspective view of a liquid crystal device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a schematic exploded perspective view of the liquid crystal device, and FIG. FIG.
The liquid crystal device 1 includes, for example, a liquid crystal panel 2 as an electro-optical panel, a flexible substrate 3 as a flexible circuit board electrically connected to the liquid crystal panel 2, and a liquid crystal panel as shown in FIGS. 2 includes a lighting device 4 that irradiates light, a frame 5 that holds the liquid crystal panel 2 and the lighting device 4, a light shielding member 6 that blocks light, and a fixing tape 50 that fixes the flexible substrate 3 on the frame. Here, in addition to the frame 5, other auxiliary mechanisms are attached to the liquid crystal device 1 as necessary (not shown).

  The liquid crystal panel 2 is sealed in a gap between the first substrate 8 and the second substrate 9 which are substrates bonded together with a sealant 7 as shown in FIGS. 1, 2 and 3, for example. It has an electro-optic material, for example, a STN (Super Twisted Nematic) type liquid crystal 10, and is accommodated in the frame 5 so that the second substrate 9 side becomes a display surface.

  For example, as shown in FIGS. 2 and 3, a plurality of common electrodes 11 are formed on the first substrate 8 in a predetermined pattern on the liquid crystal side surface, and over the common electrode 11 (liquid crystal side). A coat layer 12 is formed, and an alignment film (not shown) is further formed thereon. Further, a polarizing plate or the like (not shown) is disposed outside the first substrate 8 (on the side opposite to the liquid crystal 10).

  On the other hand, on the second substrate 9, for example, as shown in FIGS. 2 and 3, a plurality of segment electrodes 13 are formed in a predetermined pattern on the liquid crystal side surface. An overcoat layer 14 is formed, and an alignment film (not shown) is further formed thereon. Further, a polarizing plate or the like (not shown) is disposed outside the second substrate 9 (on the side opposite to the liquid crystal 10).

  Further, on the display surface on the second substrate side, for example, as shown in FIG. 1, a display region B in which an image or the like is displayed on the inside by driving a substantially rectangular liquid crystal and a surrounding part or the second substrate A non-display area C in which an image or the like of the nine overhanging portions 15 is not displayed is formed.

  Although not shown, an underlayer, a reflective layer, a colored layer, a light shielding layer, and the like are formed on the inner surface of one of the first substrate 8 and the second substrate 9 as necessary.

  Here, as shown in FIGS. 2 and 3, the first substrate 8 and the second substrate 9 are plate-like members formed of a light-transmitting material such as glass or synthetic resin, and the second substrate 9. Has a projecting portion 15 projecting outward from the first substrate 8 (in the Y-axis direction in FIGS. 2 and 3).

  The common electrodes 11 are formed in a plurality of stripes with a transparent conductive material such as ITO (Induium Tin Oxide), for example, but as shown in FIGS. 2 and 3, they are parallel in one direction (X-axis direction in the figure). It is formed to become. In addition, the segment electrode 13 is formed in a plurality of stripes with a transparent conductive material such as ITO similarly to the common electrode 11. However, as shown in FIGS. 2 and 3, the segment electrode 13 crosses the common electrode 11. It is formed in the axial direction.

  For example, as illustrated in FIGS. 2 and 3, the overhang portion 15 includes a common electrode wire 16 and a segment electrode wire 17 extending from the region where the common electrode 11 and the segment electrode 13 are surrounded by the seal material 7 to the overhang portion 15, For example, a liquid crystal driving IC 18 for supplying a liquid crystal driving current to each electrode wiring is provided. The overhanging portion 15 includes an external terminal (connection terminal) 19 that receives current from the flexible substrate 3 and the like, and an input wiring (not shown) that supplies current from the outside to the liquid crystal driving IC 18. When the liquid crystal driving IC 18 receives various signals related to a display image or the like via, for example, the flexible substrate 3 and the external terminal 19, the liquid crystal driving IC 18 generates a driving signal corresponding to the signal, and the driving signal is It is supplied to the common electrode wiring 16 and the segment electrode wiring 17.

  Next, the flexible substrate 3 is illustrated with wiring patterns 21 (21a, 21b, 21c) formed on the base substrate 20 (20a, 20b, 20c) as shown in FIGS. 1, 2, and 3, for example. Electronic components such as capacitors and ICs that are not installed are mounted. Here, the base substrate 20 (20a, 20b, 20c) is a flexible film-like member, and the wiring pattern 21 (21a, 21b, 21c) is made of, for example, copper. Moreover, although not shown in figure, the double-sided adhesive sheet is adhere | attached on the surface fixed to the flame | frame 5 grade | etc., For example. Thereby, as will be described later, the flexible substrate 3 can also prevent the liquid crystal panel 2 from protruding from the frame 5 or being displaced.

  In addition, the flexible substrate 3 includes a main body portion 22 and a right branch portion 23 and a lower branch portion 41 as extension portions extending from the main body portion 22, and the right branch portion 23 is illustrated. The lower branch portion 41 is bent to the bottom surface side of the frame 5 together with the main body portion 22. A main body connection terminal (not shown) is formed at the end of the liquid crystal panel on the main body 22 and is electrically connected to an external terminal 19 of the liquid crystal panel 2 via an ACF (Anisotropic Conductive Film) (not shown). ing. Moreover, the right branch part 23 branches from the right side (+ X direction side) of the main body part 22 as shown in FIGS. 1, 2, and 3, for example, and is provided on the base substrate 20 a of the main body part 22. A part of the wiring pattern 21 a is electrically connected to the wiring pattern 21 b provided on the base substrate 20 b of the right branch portion 23. Further, the lower branch portion 41 branches from the lower side (−Y direction side) of the main body portion 22 as shown in FIGS. 1, 2, and 3, for example, on the base substrate 20 a of the main body portion 22. A part of the wiring pattern 21 a provided on the base plate 20 is electrically connected to the wiring pattern 21 c provided on the base substrate 20 c of the lower branch portion 41.

  Next, the illumination device 4 is housed in a frame 5 as shown in FIGS. 2 and 3, for example, and is sandwiched between the liquid crystal panel 2 and the inner bottom surface of the recess of the frame 5. Specifically, it includes a light source 24, a light guide plate 25, two prism sheets 26 and 27, a diffusion sheet 28, a reflection sheet 29, a light shielding sheet 30, and the like.

  For example, an LED (LIGHT Emitting Diode) is used as the light source 24, and is mounted on the base substrate 20c of the lower branch portion 41 as shown in FIGS. The light source 24 has a light guide plate 25 on the edge side adjacent to the overhanging portion 15 of the second substrate 9 when the lower branch portion 41 is folded so as to cover the opening 40 of the frame 5 as shown in FIG. It is arranged so that light from the light source 24 is incident on a light receiving surface which is an end surface of the light source.

  The light guide plate 25 has, for example, a substantially rectangular shape as shown in FIGS. 2 and 3 and irradiates the entire diffusion sheet 28 with the light incident from the light source 24. The prism sheets 26 and 27 are the light guide plate 25. The brightness of the light emitted from is improved.

  For example, as shown in FIGS. 2 and 3, the light shielding sheet 30 is formed in a frame shape in which an opening is formed so that the central portion coincides with at least the display region B that is an area related to the display of the second substrate 9. Thus, the light in the non-display area C that is not involved in the display such as the vicinity of the overhanging portion 15 is shielded. The light shielding sheet 30 may be configured to reflect light such as black on the liquid crystal panel side and white on the prism sheet side. Thereby, the light leaked from the light source 24 and the like is reflected by the light shielding sheet 30, and the light from the outside is also absorbed by the black surface, so that the influence of the reflection on the liquid crystal driving IC 18 can be reduced.

  Here, for example, a diffusion sheet 28, two prism sheets 26 and 27, and a light shielding sheet 30 are arranged in this order on the light exit surface side of the light guide plate 25, and reflected on the opposite side of the light guide plate 25 from the exit surface. A sheet 29 is disposed. Furthermore, the light guide plate 25, the diffusion sheet 28, the two prism sheets 26 and 27, and the reflection sheet 29 have substantially the same size.

  Next, the frame 5 has, for example, a substantially box shape opened to the liquid crystal panel 2 side as shown in FIGS. 1, 2, and 3, and has a concave portion 31 inside, and the concave portion 31 is just illuminated. The device 4 and the liquid crystal panel 2 are formed to be accommodated. Specifically, the inner bottom surface 32 of the recess 31 and, for example, the reflection sheet 29 of the lighting device 4 are bonded and fixed by a double-sided adhesive sheet or the like (not shown).

  1, 2, and 3, the frame 5 is formed in parallel so as to correspond to the inner bottom surface 32 as the bottom and the side surface of the liquid crystal panel 2, and the non-display area C of the liquid crystal panel 2. The first side wall 33 (a side wall on the −X direction side in FIG. 3 toward the overhang part 15) and the second side wall 34 (the overhang part in FIG. 3) that are formed so as to sandwich the (overhang part 15). And a third side wall 35 on the projecting portion side of the liquid crystal panel 2 sandwiched between the first and second side walls.

  The first sidewall 33 and the second sidewall 34 have a first sidewall recess 36 in the first sidewall 33 and a first sidewall recess 36 in the second sidewall 34 so as to sandwich the vicinity of the protruding portion of the liquid crystal panel 2. The third side wall 35 is formed with a third side wall recess 38 at substantially the center of the third side wall 35.

  Here, in the first side wall recess 36, the upper surface of the first side wall 33 on the display surface side (the surface facing the + Z direction in the figure) is, for example, as shown in FIG. The light-shielding member is recessed substantially in the thickness direction (-Z direction in the figure), and the width of the recess 36a is formed to be equal to the width of the light-shielding member. Further, the first side wall recess 36 is recessed by the thickness of the light shielding member from the bottom surface direction to the upper surface direction on the side opposite to the recess on the upper surface side (surface facing the −Z direction in the drawing). The width of the recess 36b is formed to be equal to the width of the light shielding member. Further, the first side wall recess 36 has an outer surface (a surface facing the -X direction in the figure) sandwiched between the upper and lower dents inward from the outer surface to the inner side (+ X direction in the figure). The width of the recess 36c is formed so as to be equal to the width of the light shielding member. Thereby, the light shielding member does not protrude from the first side wall 33 of the frame 5 due to the attachment of the light shielding member, so that the liquid crystal device 1 can be miniaturized and the positioning of the light shielding member is facilitated.

  In the second side wall recess 37, the upper surface (the surface facing the + Z direction in the figure) of the second side wall 34 on the display surface side is, for example, as shown in FIG. The width of the right branch portion 23 of the flexible substrate is recessed toward the Z direction, and the width of the recess 37a is formed to be equal to the width of the right branch portion 23. Further, the second side wall concave portion 37 is recessed by the thickness of the substantially right side branching portion 23 from the bottom surface direction toward the upper surface direction on the side opposite to the recess on the upper surface side (surface facing the −Z direction in the drawing) The width of the recess 37b is formed to be equal to the width of the right branch portion 23. In addition, the second side wall recess 37 has an outer surface (on the opposite side to the outer surface of the first side wall recess) sandwiched between the upper and lower surface recesses from the outer surface inward (opposite direction to the first side wall recess). The width of the recess 37c is formed to be equal to the width of the right branch 23. As a result, the right branch portion 23 does not protrude from the second side wall 34 of the frame 5 due to the attachment of the right branch portion 23, whereby the liquid crystal device 1 can be downsized, and the right branch portion 23 can be easily positioned.

  In the third side wall recess 38, the upper surface of the third side wall 35 on the display surface side (the surface facing the + Z direction in the figure) is, for example, as shown in FIGS. The second substrate 9, the external terminal 19, and the flexible substrate main body 22 have a thickness that is substantially the same as the width of the main body. It is formed to become. Further, the third side wall recess 38 is recessed at least approximately the thickness of the main body portion 22 of the flexible substrate from the bottom surface direction to the upper surface direction on the opposite side (the surface facing the -Z direction in the figure) from the upper surface side recess. The width of the recess 38b is formed to be equal to the width of the main body portion 22. Further, the third side wall recess 38 has an outer surface (a surface facing the −Y direction in the drawing) sandwiched between the upper and lower recesses, and the thickness of the main body 22 from the outer surface to the inside (the + Y direction in the drawing). The width of the recess 38c is formed to be equal to the width of the main body 22. Thereby, the liquid crystal device 1 can be reduced in size without sticking the main body portion 22 of the flexible substrate 3 so that the main body portion 22 protrudes from the third side wall 35 of the frame 5, and the positioning of the main body portion 22 is facilitated.

  For example, as shown in FIG. 3, the inner bottom surface 32 has a partially inner bottom surface near the center of the edge of the first substrate 8 adjacent to the overhanging portion 15 and on the overhanging portion 15 side and the opposite side of the overhanging portion. An opening 40 is provided to leave. The opening 40 is covered from the outside of the frame 5 by the lower branching portion 41, and the light source 24 just mounted on the lower branching portion 41 is inserted into the frame from the opening 40 and the light guide plate 25 is not shown. It is formed so as to be arranged on the light receiving surface.

  Further, the frame 5 has a partially outer bottom surface 39 as an external bottom surface on the surface opposite to the inner bottom surface 32 that overlaps the overhanging portion 15 (the surface opposite to the liquid crystal panel side). Such a partial outer bottom surface 39 overlaps the overhanging portion 15 in a planar manner. Of course, the frame 5 has an outer bottom surface corresponding to the inner bottom surface 32 in addition to a part of the outer bottom surface, for example, in a plane overlapping the display area B.

  Here, as shown in FIGS. 1 and 2, the flexible substrate 3 includes a main body portion 22 electrically connected to the external terminal 19 of the first substrate 8 and a lower branch portion 41 branched from the main body portion 22. However, for example, it extends from the recess 38a on the upper surface side of the third side wall recess 38 to the outside of the frame 5 and passes through the recess 38c on the outer surface of the third side wall recess 38 as it is. Further, the main body portion 22 and the lower branching portion 41 wrap around the bottom of the frame 5 from the recess 38 b on the lower surface side of the third side wall recess 38 to cover the opening 40, and end of the main body portion 22 and the lower branching portion 41. The part is bonded to the opposite surface (outer bottom surface) of the inner bottom surface 32. Of course, the main body portion 22 and the lower branch portion 41 are also bonded to contact surfaces with the other third side wall recesses 38 and the like.

  Further, the right branch portion 23 branched from the main body portion 22 extends from the recess 37b on the opposite side to the upper surface side of the second side wall recess 37, for example, as shown in FIGS. The side wall recess 37 is bonded to the outer surface through a recess 37c. Further, the right branch 23 bonded to the outer recess 37 c returns from the recess 37 a on the upper surface side of the second sidewall recess 37 into the frame 5, and the overhanging portion 15 (non-display area C) adjacent to the second sidewall 34. ) Is adhered to the second region D which is a part of the surface. Further, the tip of the right branch portion 23 extends from the recess 38 a on the upper surface side of the third side wall recess 38 over the main body portion 22 to the outside of the frame 5. Note that the distal end portion is electrically connected to an external circuit (not shown) by, for example, a connector.

  Next, the light shielding member 6 has a double-sided adhesive sheet adhered on a film substrate such as a black-printed PET (polyethylene terephthalate) film, and the display surface of the overhanging portion 15 as shown in FIGS. Covers the right branch 23 bonded to the side surface, and includes a first region E that is a part of the surface of the overhanging portion adjacent to the first side wall 33, and is disposed so as to cover substantially the entire surface of the overhanging portion. Has been. Further, the light shielding member 6 bonded to the overhanging portion 15 extends from the display surface side surface of the overhanging portion 15 to the depression 36a on the upper surface side of the first side wall recess 36 as shown in FIG. The dent 36 b passes through the dent 36 c on the outer surface and passes from the dent 36 b on the opposite side to the upper surface to the partially outer bottom surface 39 of the frame 5, and is bonded to the partially outer bottom surface 39. Of course, the light shielding member 6 may partially extend from the outer bottom surface 39 to the main body 22 of the flexible substrate 3 and finally be bonded to the surface of the main body 22. As a result, the flexible substrate 3 and the light shielding member 6 are connected together, and the frame 5 and the liquid crystal panel 2 are more firmly fixed, so that the liquid crystal panel 2 can be prevented from jumping out from the frame 5 and from being displaced.

  The opening 40 described above is formed in a substantially rectangular shape as shown in FIGS. 2 and 3, but is not limited to this, for example, a hole, a notch, or the bottom surface (inner bottom surface) of the frame 5. Any structure in which the frame 5 is not present in the portion corresponding to the light source 24 such as a structure in which the flexible substrate side is cut off may be used.

  In addition, the upper surface side of the first side wall recess 36, the second side wall recess 37, and the third side wall recess 38, and the recesses on the opposite side and the outer surface are the thicknesses of the light shielding member 6, the right branch portion 23, and the main body portion 22, respectively. Although it has been dented with the same size as the width and width, it is not limited to this, and for example, it may of course be slightly larger than those sizes. As a result, some errors can be covered.

  Further, the portions of the first and second side walls 33 and 34 where the light shielding member 6 and the flexible substrate 3 are applied are partly cut out so that there is no step between the display side surface of the liquid crystal panel 2 and the upper surface of each side wall. It is preferable that it is comprised. Thereby, it is possible to prevent the light shielding member 6 or the flexible substrate 3 that is an adhesive base material from floating from the surface of the overhanging portion 15 or the like of the liquid crystal panel 2.

  Next, when viewed from the frame 5 side, as shown in FIG. 4, the main body portion 22 and the lower branch portion 41 branched from the main body portion wrap around the frame 5 from the recess 38 b on the lower surface side of the third side wall recess 38. The end portion of the main body portion 22 and the end portion of the lower branch portion 41 are bonded onto the frame 5. A fixing tape 50 for fixing the main body portion 22 and the lower branch portion 41 from the upper surface side (the side opposite to the surface facing the liquid crystal panel of the flexible substrate) is attached to the center portion of the frame 5. The fixing tape 50 is formed by bonding the main body 22 and the lower branch 41 to the frame 5 with an adhesive such as a double-sided adhesive sheet, and then preventing the adhesive from peeling off. The part 41 is attached from the side opposite to the frame 5 and is arranged so as to cover the lower branch part 41 across the boundary part between the main body part 22 and the frame 5. The fixing tape 50 is, for example, an adhesive applied to the back surface of the paper that is the base substrate, and the product number, as the product identification information of the liquid crystal device 1, on the surface of the paper that is the base substrate. Information such as version information, date of manufacture, fluid factory, and fluid time is printed. The base substrate is not limited to paper and may be any material that can be printed.

[Method of manufacturing liquid crystal device]
Next, the manufacturing method of the liquid crystal device 1 configured as described above will be described focusing on the process of bonding the flexible substrate 3 and the light shielding member 6 to the liquid crystal panel 2 and the frame 5.
FIG. 5 is an explanatory diagram of a state in which the lighting device and the liquid crystal panel are housed in a frame, FIG. 6 is an explanatory diagram of a state in which the main body of the flexible substrate is folded, and FIG. 7 is an explanatory diagram of a state in which the right branch portion of the flexible substrate is folded. 8 is an explanatory view showing a state in which the light shielding member is bonded to the overhanging portion, and FIG. 9 is an explanatory view showing a state in which the fixing tape is stuck on the flexible substrate.

  First, the liquid crystal panel 2, the flexible substrate 3, and the lighting device 4 are manufactured by a known method, and the flexible substrate 3 and the surface (first surface) on which the external terminal 19 of the overhanging portion 15 is provided are electrically connected. To do.

  Next, the reflective sheet 29 of the lighting device 4 is bonded to the inner bottom surface 32 of the frame 5 shown in FIG. 3 by a double-sided adhesive sheet (not shown), and the first substrate side of the liquid crystal panel 2 is further disposed thereon, and illumination is performed. The device 4 and the liquid crystal panel 2 are accommodated in the recess 31 of the frame 5. At this time, the main body portion 22 of the flexible substrate 3 electrically connected to the external terminal 19 of the second substrate 9 through an ACF (not shown) is a recess on the upper surface side of the third side wall recess 38 as shown in FIG. 38a is once taken out of the frame 5.

  5 is bent in the direction of the arrow F shown in FIG. 5, and the end surface of the main body 22 is bent from the recess on the lower surface side of the third side wall recess 38 of the frame 5 to the bottom of the frame 5. Wrap around. Then, as shown in FIG. 6, the light source 24 mounted on the lower branching portion 41 is inserted from the opening 40 while the lower branching portion 41 covers the opening 40 of the frame 5, and the light receiving surface of the light guide plate 25. And the ends of the main body portion 22 and the lower branch portion 41 are bonded to the opposite side surface (outer bottom surface; second surface) of the inner bottom surface 32 of the frame 5 with a double-sided adhesive sheet (not shown). At that time, the right branch portion 23 branched from the right side of the main body portion 22 is adhered to a part of the outer bottom surface 39 on the second side wall recess 37 side as shown in FIG. Pull out from 37b to the outside of the frame 5.

  Further, the right branch portion 23 pulled out to the outside of the frame 5 is bent as indicated by an arrow G shown in FIG. 6 and bonded to the recess 37c on the outer surface side of the second side wall recess 37, and further the upper surface side of the second side wall recess 37 7 is returned to the inside of the frame 5 as shown in FIG. 7 and bonded to a part of the surface of the overhanging portion 15 on the display surface side of the second substrate 9, and the tip of the right branch portion 23 is the first end. From the recess 38 a on the upper surface side of the three side wall recesses 38, it passes over the main body 22 and is pulled out of the frame 5. Note that a connector connected to the outside may be provided at the tip of the right branch portion 23.

  Further, for example, as shown in FIG. 8, the light shielding member 6 is disposed and bonded to the entire surface of the overhanging portion 15 so as to cover the right branch portion 23 bonded to the display surface side surface of the overhanging portion 15.

  Next, the light shielding member 6 bonded to the overhanging portion 15 is extended from the display surface side surface of the overhanging portion 15 to the depression 36a on the upper surface side of the first side wall recess 36 as shown in FIG. As shown in FIG. 1, it travels in the direction along a recess 36c (not shown) on the outer surface of the first side wall recess 36 and passes from a recess 36b (not shown) on the opposite side to the top surface to a part of the outer bottom surface 39 of the frame 5. Adhering to the partially outer bottom surface 39. Of course, the light shielding member 6 may be partially extended from the outer bottom surface 39 to the main body 22 of the flexible substrate 3 and finally adhered to the surface of the main body 22. As a result, the flexible substrate 3 and the light shielding member 6 are connected together, and the frame 5 and the liquid crystal panel 2 are more firmly fixed, so that the liquid crystal panel 2 can be prevented from jumping out from the frame 5 and from being displaced.

  Subsequently, as shown in FIG. 9, the fixing tape 50 is pasted on the main body portion 22 and the lower branch portion 41 bonded on the outer bottom surface of the frame 5 from the side opposite to the frame 5 (from the −Z direction side). To wear. The fixing tape 50 is disposed so as to straddle at least the boundary between the main body portion 22 and the frame 5. By doing so, it is possible to prevent the adhesive disposed between the flexible substrate 3 and the frame 5 from peeling off. In addition, product identification information of the liquid crystal device 1 is printed in advance on the fixing tape 50 by a stamp or the like, and by sticking the fixing tape 50, the liquid crystal device 1 is distributed to a trader or the like in the distribution process. Product identification information can be easily provided.

Above, description of the manufacturing method of the liquid crystal device 1 is complete | finished.
According to such a liquid crystal device 1 of the present embodiment, the following operational effects can be obtained.
(1) Since the flexible substrate 3 and the frame 5 are doubly fixed by the double-sided adhesive sheet and the fixing tape 50, the floating and shifting of the flexible substrate are suppressed over a long period of time, and the optical axis of the light source 24 is suppressed from shifting. be able to.

(2) Since product identification information is printed on the fixing tape 50, a sufficient print area can be secured even when the size of the liquid crystal device 1 is small. In addition, since product identification information is printed on the fixing tape 50 and then pasted on the flexible substrate 3, electronic components (light source 24, capacitor, IC, etc.) mounted on the flexible substrate 3 by mechanical pressure due to printing. In this case, an undesired compound (for example, a compound that does not meet ISO standards) is formed by a chemical reaction between the flexible substrate 3 and the printing ink. It is not generated.

  In the present embodiment, product identification information is printed on the fixing tape 50 in advance by a stamp or the like, and then the flexible substrate 3 is fixed by the fixing tape 50. However, the product identification information is printed by a droplet discharge method ( In the case of the ink jet method, the flexible substrate 3 can be fixed with the fixing tape 50 first, and then product identification information can be printed on the fixing tape 50. This is because, if the mechanical stress at the time of printing is small like the droplet discharge method, it is difficult to cause a connection failure even in an electronic component mounted on the flexible substrate 3. However, even when printing is performed by a mechanical printing method such as a stamp, if printing is performed in a region other than the mounting region of the electronic component (a region that does not overlap with the electronic component mounted on the flexible substrate 3), Such a problem does not occur. Therefore, if the product identification information is printed in an area other than the area arranged on the mounting area of the fixing tape 50, the flexible substrate 3 is first fixed with the fixing tape 50, and then the product identification information. It is also possible to print on the fixing tape 50.

(3) Since the adhesive base material, for example, the light shielding member 6, is continuously adhered to the overhanging portion 15 and the like which are also the non-display area C of the liquid crystal device 1 and the frame 5 that holds the liquid crystal panel 2 and the like. It is possible to prevent the liquid crystal panel 2 from jumping out of the frame 5 or being displaced due to an impact applied to 5. Further, since the liquid crystal panel 2 is adhered to the non-display area, the light shielding member 6 can be prevented from obstructing the display of the liquid crystal device 1.

(4) If the light shielding member 6 is used for the adhesive base, even when the liquid crystal driving IC 18 is mounted on the projecting portion 15 which is also a non-display area, for example, the light to the liquid crystal driving IC 18 is shielded and the liquid crystal driving is performed. The malfunction of the IC 18 due to light can be prevented, and the light shielding member 6 can prevent the liquid crystal panel 2 from jumping out from the frame 5 or being displaced. Further, since the light shielding member 6 is used as it is for preventing the liquid crystal panel or the like from jumping out, no new parts are required, and the object can be achieved at low cost. In addition, since the adhesive member can be bonded in a conventional process for attaching the light shielding member 6, the number of processes does not increase.

(5) The light shielding member 6 is substantially removed from the first side wall 33 and the first region E so as to overlap the flexible substrate 3 bonded to the second region D of the projecting portion 15 from the second side wall 34. Since it extends over the entire surface of the overhang portion, the flexible substrate 3 is also firmly fixed by the light shielding member 6. In addition, since the light shielding member 6 also covers the liquid crystal panel 2 from the first region E to the second region D in the non-display region at least on the entire surface of the overhanging portion, the light shielding effect is increased.

(6) The right branch portion 23 of the flexible substrate 3 is bent into the second region D so as to wrap around from the outside of the second side wall of the frame 5, and the light shielding member 6 is placed on the first side wall side of the frame 5. Therefore, it is possible to prevent the electro-optical panel from jumping out with the existing flexible substrate 3 and the light shielding member 6. Further, if the light shielding member 6 is adhered to the overhanging portion 15 which is also a non-display area with a little larger size, it is possible to prevent malfunction of light of the mounted liquid crystal driving IC or the like.

(7) Since the light-shielding member 6 extends to a part of the outer bottom surface 39 of the frame 5, the bonding area between the light-shielding member 6 as an adhesive base and the frame 5 is increased, and the liquid crystal panel 2 from the frame 5 Thus, it is possible to more firmly prevent popping out and misalignment.

(8) Since the main body portion 22 can be pressed and fixed toward the liquid crystal panel 2 by the adhesive base material, for example, the light shielding member 6, which is bonded to the side opposite to the side where the light source 24 is mounted of the main body portion 22. It is possible to prevent the main body portion 22 from floating from the light guide plate 25 fixed to the liquid crystal panel 2 and the light source 24 to be displaced from the light guide plate 25 in the vertical direction. Therefore, the light emitted from the light source 24 can be reliably incident on the light guide plate 25.

[Electronics]
Next, an electronic apparatus including the liquid crystal device 1 will be described. In addition, about the component which is common in the component demonstrated by the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. FIG. 10 is a schematic configuration diagram showing the overall configuration of the display control system of the electronic device.

  The electronic device 300 includes, for example, a liquid crystal panel 2 and a display control circuit 390 as shown in FIG. 10 as a display control system. The display control circuit 390 includes a display information output source 391, a display information processing circuit 392, a power supply circuit 393, and the like. A timing generator 394 and the like are included. In addition, the liquid crystal panel 2 includes a drive circuit 361 that drives the display region I.

  The display information output source 391 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. It has. Further, the display information output source 391 is configured to supply display information to the display information processing circuit 392 in the form of a predetermined format image signal or the like based on various clock signals generated by the timing generator 394.

  The display information processing circuit 392 includes various well-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 display the image. Information is supplied to the drive circuit 361 together with the clock signal CLK. The power supply circuit 393 supplies a predetermined voltage to each component described above.

  According to such an electronic apparatus, since the liquid crystal device 1 is provided in the display unit, an electronic apparatus that is easily downsized and excellent in reliability is provided.

  Specific electronic devices include touch panels equipped with liquid crystal devices in addition to mobile phones and personal computers, projectors, liquid crystal televisions and viewfinder types, video tape recorders with direct view of monitors, car navigation systems, pagers, electronic notebooks, A calculator, a word processor, a workstation, a video phone, a POS terminal, etc. are mentioned. And it cannot be overemphasized that the liquid crystal device 1 mentioned above is applicable as a display part of these various electronic devices, for example.

Although the present invention has been described above with the preferred embodiment, the present invention is not limited to any of the above-described embodiments, and can be implemented with appropriate modifications within the scope of the technical idea of the present invention.
For example, in the above-described embodiment, the end portion of the flexible substrate 3 is fixed on the outer bottom surface of the frame 5, but the surface (second surface) for fixing the flexible substrate 3 is not necessarily limited to this, and illumination The back surface of the device 4 (the back surface of the reflection sheet 29) or the like may be used.

  In the above-described embodiment, the passive matrix type liquid crystal device has been described. However, the present invention is not limited to this. For example, a thin film transistor element active matrix type or thin film diode element active matrix type liquid crystal device may be used. Furthermore, not only a transflective type but also a transmissive type may be used.

  In the above embodiment, the liquid crystal device has been described as an example of the electro-optical device. However, the present invention is not limited to this, and the present invention can also be applied to electro-optical devices other than the liquid crystal device. In the present invention, the electro-optical device is a generic term including an electro-optical effect that changes the light transmittance by changing the refractive index of a substance due to an electric field, and a device that converts electric energy into optical energy. Yes. Specifically, a liquid crystal device using liquid crystal as an electro-optical material, an organic EL device using organic EL (Electro-Luminescence) as an electro-optical material, an inorganic EL device using inorganic EL, and a plasma using a plasma gas as an electro-optical material There are display devices. Furthermore, there are electrophoretic display (EPD), field emission display (FED), electrochromic display (ECD), etc., and the present invention is widely applied to these various electro-optical devices. Applicable.

1 is a schematic perspective view of a liquid crystal device which is an example of an electro-optical device. It is the sectional view on the AA line of FIG. 1 is a schematic exploded perspective view of a liquid crystal device according to a first embodiment. It is the top view which looked at the liquid crystal device from the case side. It is explanatory drawing of the state which accommodated the illuminating device and the liquid crystal panel in the flame | frame. It is explanatory drawing of the state which bent the main-body part of the flexible substrate. It is explanatory drawing of the state which bent the right side branch part of the flexible substrate. It is explanatory drawing of the state which adhere | attached the light shielding member on the overhang | projection part. It is explanatory drawing of the state which stuck the tape for fixing from the outer side of the flexible substrate. It is a schematic block diagram of the display control system of an electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal device (electro-optical device), 2 ... Liquid crystal panel (electro-optical panel), 3 ... Flexible substrate (flexible circuit board), 19 ... External terminal (connection terminal), 50 ... Fixing tape

Claims (7)

An electro-optical device having a connection terminal provided on an electro-optical panel, a flexible circuit board electrically connected to the connection terminal, and a fixing tape for fixing the flexible circuit board,
The fixing tape is made of a printable material, and product identification information of the electro-optical device is printed on the fixing tape,
The flexible circuit board is disposed in a region overlapping the electro-optical panel, and is fixed to the electro-optical panel side from the opposite side of the surface of the flexible circuit board facing the electro-optical panel by the fixing tape. An electro-optical device.   An adhesive is provided between the flexible circuit board and a surface of the flexible board facing the electro-optic panel, and the flexible circuit board is fixed to the electro-optic panel side by the adhesive. The electro-optical device according to claim 1. An electro-optical device manufacturing method comprising: a connection terminal provided on an electro-optical panel; a flexible circuit board electrically connected to the connection terminal; and a fixing tape for fixing the flexible circuit board,
Printing product identification information of the electro-optical device on the fixing tape;
Electrically connecting the flexible circuit board to the connection terminal;
The step of arranging the flexible circuit board in a region overlapping the electro-optical panel and fixing the flexible circuit board to the electro-optical panel side from the opposite side of the surface of the flexible circuit board facing the electro-optical panel. And a method of manufacturing the electro-optical device. An electro-optical device manufacturing method comprising: a connection terminal provided on an electro-optical panel; a flexible circuit board electrically connected to the connection terminal; and a fixing tape for fixing the flexible circuit board,
Electrically connecting the flexible circuit board to the connection terminal;
Arranging the flexible circuit board in a region overlapping the electro-optic panel and fixing the flexible circuit board to the electro-optic panel side from the opposite side of the surface of the flexible circuit board facing the electro-optic panel; ,
And a step of printing product identification information of the electro-optical device on the fixing tape by a droplet discharge method. An electro-optical device manufacturing method comprising: a connection terminal provided on an electro-optical panel; a flexible circuit board electrically connected to the connection terminal; and a fixing tape for fixing the flexible circuit board,
Electrically connecting the flexible circuit board to the connection terminal;
Arranging the flexible circuit board in a region overlapping the electro-optic panel and fixing the flexible circuit board to the electro-optic panel side from the opposite side of the surface of the flexible circuit board facing the electro-optic panel; ,
And a step of printing product identification information of the electro-optical device on a region that does not overlap the electronic component mounted on the flexible circuit board on the fixing tape. Production method.   Before the flexible circuit board is fixed by the fixing tape, the flexible circuit board is bonded to the electro-optical panel by an adhesive provided between the flexible circuit board and a surface of the flexible board facing the electro-optical panel. The method of manufacturing an electro-optical device according to claim 3, wherein the method is fixed to the side. An electronic apparatus comprising the electro-optical device according to claim 1 or 2 or the electro-optical device manufactured by the method for manufacturing an electro-optical device according to any one of claims 3 to 6.

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