JP4859346B2 - Liquid crystal display device, method for manufacturing liquid crystal display device, electronic device - Google Patents

Description

  The present invention relates to a liquid crystal display device, a manufacturing method thereof, and an electronic device including the liquid crystal display device, and more particularly, a liquid crystal display device including a light guide in a metal frame, a manufacturing method thereof, and a liquid crystal display. The present invention relates to an electronic device including the device.

  Conventionally, liquid crystal display devices are widely used in applications such as portable electronic devices and personal computer monitors. Such a liquid crystal display device is provided with a liquid crystal display (LCD) module, and this LCD module is usually composed of an LCD panel, a light guide, a plastic frame, a gold frame, etc., and a plastic is placed in the gold frame. A frame is accommodated, and a light guide is accommodated in the plastic frame. The LCD panel is disposed on the light guide.

Japanese Patent Laid-Open No. 6-347782

  By the way, the conventional LCD module as described above is manufactured by separately molding the plastic frame and manufacturing the metal frame and assembling them. For this reason, since manufacturing tolerances and assembly tolerances of the respective parts are required, there is a problem that rattling between the parts is likely to occur after assembly, and the assembly accuracy is not good. In this case, the problem that the intensity | strength of the LCD module as an assembly structure is not good arises. Here, since the strength of the LCD module is directly related to the strength of the liquid crystal display device, there arises a problem that the liquid crystal display device cannot obtain good strength.

  In addition, since the above-described tolerance is required, the size of the entire LCD module is increased by the tolerance, so that there is a restriction on the miniaturization of the LCD module, and it is difficult to further miniaturize the LCD module. Here, since the size of the LCD module is directly linked to the size of the liquid crystal display device, there arises a problem that it is difficult to further reduce the size of the liquid crystal display device.

  Here, as techniques for improving the assembly accuracy, a liquid crystal display panel composed of an upper frame having a display window, a liquid crystal plate integrated with a drive circuit board, and a light guide assembly composed of a light diffusion plate and a light guide. A frame-shaped intermediate frame that houses this light guide assembly and mounts a linear backlight light source on at least one side, and a lower frame are laminated in this order, and the upper frame and the lower frame are connected and fixed. In the liquid crystal display device formed by connecting and fixing the upper frame and the lower frame, each side of the light guide assembly is placed on the inner side of the intermediate frame that houses the light guide assembly. There has been proposed a liquid crystal display device formed by integrally forming a frame-like spacer covering from the liquid crystal display panel side (see, for example, Patent Document 1).

  However, the technique described in Patent Document 1 does not include a metal frame with respect to assembly accuracy, and does not improve the strength of the LCD module. That is, it cannot be said that the strength of the LCD module is good. Further, the entire LCD module is not downsized.

  Accordingly, an LCD module having sufficiently good strength and reduced in size has not been established yet, and there is still room for improvement with respect to these viewpoints.

  The present invention has been made in view of the above, and an object of the present invention is to provide a liquid crystal display device having sufficiently good strength and further reduced in size, and a method for manufacturing the same. Moreover, it aims at providing the electronic device provided with this liquid crystal display device.

In order to solve the above-described problems and achieve the object, a liquid crystal display device according to the present invention is arranged to face a liquid crystal panel, a light source, and the liquid crystal panel, and guides light from the light source to the liquid crystal panel side. A light guide that illuminates the light guide, a plastic frame that houses the light guide and surrounds a side surface of the light guide along the outer shape of the light guide , the liquid crystal panel, the light guide, and the plastic frame And a metal container having a side surface and a bottom surface for housing the plastic container, wherein the plastic frame is abutted against the side surface and the bottom surface on the inner surface side of the metal container by injection molding. are integrally molded in a state of contact with, the opening is provided in the metal container, the plastic frame, in the opening configuration material of the plastic frame during the injection molding Wherein the convex portion fitted to the opening portion is formed by being Komu.
Moreover, the liquid crystal display device according to the present invention is characterized in that the opening of the metal container is provided on the bottom surface of the metal container.
Further, in the liquid crystal display device according to the present invention, a plurality of the convex portions that fit into the opening of the metal container are provided, and the liquid crystal display device protrudes to the outer surface side of the metal container, and the liquid crystal display device is mounted. It is used for positioning with an electronic device.
In the liquid crystal display device according to the present invention, a reflective sheet is disposed between the bottom surface of the metal container and the light guide, and an end of the reflective sheet is disposed between the plastic frame and the metal container. The plastic frame is integrally formed by being in contact with the side surface and the bottom surface of the inner surface of the metal container by injection molding so that the plastic frame is disposed between the bottom surface and the bottom surface of the body. To do.
The liquid crystal display device according to the present invention is characterized in that the light guide is integrally formed in an opening of the plastic frame that houses the light guide.

  In this liquid crystal display device, since the container and the frame are integrally formed, there is no space between the container and the frame. The container and the frame are in contact with each other. Thereby, it can prevent effectively that assembly accuracy falls due to the clearance gap between a container and a flame | frame. Further, it is possible to prevent the strength as the assembly structure of the liquid crystal display device, particularly the torsional strength, from being lowered due to the gap. Therefore, in this liquid crystal display device, there is an effect that a liquid crystal display device having good and sufficient strength can be realized by integrally forming the container and the frame. Further, this liquid crystal display device is configured in a state in which the container and the frame are in contact with each other, and since there is no gap between both members, there is an effect that the entire liquid crystal display device can be reduced in size.

  Further, in this liquid crystal display device, the container and the frame are fitted and fixed by fitting the convex part provided on the frame to the concave part provided on the container, so that the container and the frame are securely connected. In addition, there is an effect that it can be firmly fixed.

According to a preferred aspect of the present invention, a connecting portion for connecting to another member outside the metal container is integrally formed with the plastic frame outside the container. This liquid crystal display device can be connected easily and accurately when it is disposed in an electronic device or the like by including a connecting portion. And since this connection part is integrally molded with the frame outside the container, it can be provided at any part of the container, and this liquid crystal display device has a high degree of freedom in the position of the connection part. It is said that.

According to a preferred aspect of the present invention, the light guide is integrally formed in the first opening of the plastic frame . As a result, it is possible to effectively prevent the assembly accuracy from being lowered due to the gap between the frame and the light guide. Thereby, the positional accuracy of a light guide can also be improved. Further, it is possible to prevent the strength as the assembly structure of the liquid crystal display device, particularly the torsional strength, from being lowered due to the gap. Therefore, in this liquid crystal display device, since the light guide is integrally formed with the frame, it is possible to realize a liquid crystal display device having better and sufficient strength.

  In addition, this liquid crystal display device is configured in a state where the frame and the light guide are in contact with each other, and there is no gap between the two members, so that the entire liquid crystal display device can be further reduced in size. Play.

In order to solve the above-described problems and achieve the object, the liquid crystal display device according to the present invention is characterized in that the inner bottom surface and the inner side surface of the metal container are constituted by a reflecting portion .

  In addition, according to the present invention, an electronic apparatus having the above-described liquid crystal display device is provided. As a result, it is possible to provide a high-quality electronic device having a sufficiently good strength and further miniaturized.

In order to solve the above-described problems and achieve the object, a manufacturing method of a liquid crystal display device according to the present invention includes a liquid crystal panel, a light source, and a liquid crystal panel arranged opposite to each other, and guides light from the light source. A light guide that illuminates the liquid crystal panel , a plastic frame that houses the light guide and surrounds a side surface of the light guide along the outer shape of the light guide , the liquid crystal panel, the light guide, and A liquid crystal display device manufacturing method comprising: a metal container having a side surface and a bottom surface for accommodating the plastic frame; and a step of forming an opening in the metal container; Pouring the constituent material of the plastic frame into the inner surface side of the metal container so as to contact the side surface and the bottom surface on the inner surface side, and integrally molding the metal container and the plastic frame; Wherein the step of integrally molded with said plastic frame and said metal container, the plastic projections which constituent material is fitted to the opening by causing flow into the opening of the metal container of the plastic frame It is formed in a frame .

  In this method of manufacturing a liquid crystal display device, since the container and the frame are integrally formed, there is no space between the container and the frame, that is, the liquid crystal display device in which the container and the frame are in contact with each other Can be manufactured. Thereby, it can prevent effectively that assembly accuracy falls due to the clearance gap between a container and a flame | frame. Further, it is possible to prevent the strength as the assembly structure of the liquid crystal display device, particularly the torsional strength, from being lowered due to the gap.

  Therefore, according to this method of manufacturing a liquid crystal display device, there is an effect that a liquid crystal display device having good and sufficient strength can be realized. Further, in this liquid crystal display device manufacturing method, since the container and the frame are in contact with each other, there is no gap between the two members, and the entire liquid crystal display device can be reduced in size. Play.

  Further, in this method of manufacturing a liquid crystal display device, the container and the frame are fitted and fixed by fitting the convex part provided on the frame into the concave part provided on the container, so that the container and the frame are securely connected. In addition, there is an effect that it can be firmly fixed.

  In order to solve the above-described problems and achieve the object, a method for manufacturing a liquid crystal display device according to the present invention includes a liquid crystal panel and a light source that illuminates the liquid crystal panel. A liquid crystal display device having a light guide guided to the side, a liquid crystal panel and a housing for housing the light guide, wherein a recess for fitting is formed in the housing; A step of performing reflection processing on the inner bottom surface and the inner side surface, and a step of pouring the constituent material of the light guide into the interior of the housing including the recess of the housing and integrally molding the housing and the light guide. It is characterized by that.

  In this method of manufacturing a liquid crystal display device, since the container and the light guide are integrally formed, there is no space between the container and the light guide, that is, the container and the light guide are in contact with each other. The liquid crystal display device described above can be manufactured. Thereby, it can prevent effectively that assembly accuracy falls due to the clearance gap between a container and a light guide. Further, it is possible to prevent the strength as the assembly structure of the liquid crystal display device, particularly the torsional strength, from being lowered due to the gap.

  Therefore, according to this method of manufacturing a liquid crystal display device, there is an effect that a liquid crystal display device having good and sufficient strength can be realized. Further, in this method of manufacturing a liquid crystal display device, since the container and the light guide are configured in contact with each other, there is no gap between the two members, and the entire liquid crystal display device can be reduced in size. There is an effect.

  Further, in this method of manufacturing a liquid crystal display device, the container and the light guide are fitted and fixed by fitting the protrusion provided on the light guide into the recess provided in the container. There exists an effect that it can fix to a light guide reliably and firmly.

  Embodiments of a liquid crystal display device, a manufacturing method thereof, and an electronic apparatus according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the following description, and can be appropriately changed without departing from the gist of the present invention. The drawings and the scales between the members may be different for easy understanding.

  FIG. 1 is an exploded perspective view illustrating the configuration of the liquid crystal display device 50 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the main part illustrating the configuration of the liquid crystal display device 50. 3 and 4 are diagrams for explaining the configuration of the liquid crystal display device 50. FIG. 3 is a bottom view of the liquid crystal display device 50 as viewed from the direction of arrow A in FIG. FIG. 4 is a side view of the liquid crystal display device 50 as viewed from the direction of arrow B in FIG. 3. As shown in FIGS. 1 and 2, the liquid crystal display device 50 according to the present embodiment includes a liquid crystal panel 1 to which a flexible wiring substrate 11 on which a conductor pattern including wiring, a driving IC chip, and the like are mounted, and the liquid crystal The backlight unit 3 that illuminates the panel 1 is configured to be housed in a metal case 5 that is a container in which a plastic frame 7 is integrally formed. And in this liquid crystal display device 50, as shown in FIG.1 and FIG.2, the flexible wiring board 11 is bent and fixed so that it may overlap with the back surface (surface on the opposite side to the liquid crystal panel 1) of the metal case 5. FIG.

  As shown in FIG. 2, the liquid crystal panel 1 is formed by bonding a substrate 21 and a substrate 23 through a sealing material (not shown) and enclosing a liquid crystal 25 between the substrates. Electrode patterns (not shown) are formed on the inner surfaces of the substrate 21 and the substrate 23, respectively. Further, polarizing plates 27 and 29 are attached to the outer surfaces of the substrate 21 and the substrate 23, respectively.

  The backlight unit 3 includes an optical sheet layer 15 in which a plurality of optical sheets such as a diffusion sheet and a prism sheet are stacked, and a light guide 17 that guides light from a light source. As the light source, a light emitter such as a light emitting diode (LED) 18 is used. For example, when the LED 18 is mounted on the flexible wiring board 11, the LED 18 is arranged on the flexible wiring board 11 so that the LED 18 is positioned at the end of the light guide 17 when the flexible wiring board 11 is bent and arranged. Has been. The liquid crystal panel 1 and the backlight unit 3 are fixed by a light-shielding double-sided tape 19 at the outer peripheral edge of the opposing surface. Here, the light-shielding double-sided tape 19 fixes the backlight unit 3 and the liquid crystal panel 1 and blocks the light from the backlight unit 3 at the outer edge of the backlight unit 3 to restrict the illumination area of the liquid crystal panel 1. It also functions. In addition, a reflection sheet 9 that reflects light from the backlight unit 3 is disposed at the bottom of the metal case 5, and the light from the backlight unit 3 is reflected by the reflection sheet 9 in the liquid crystal display device. Is being used effectively.

  The metal case 5 serving as a housing portion is a thin box-like body, and has an upper surface (liquid crystal panel side) opened. Moreover, the metal case 5 has the opening part 5a also in the position where LED18 is arrange | positioned. The opening 5 a is opened to fit the LED 18 mounted on the flexible wiring board 11 and to be disposed at the end of the light guide 17. The metal case 5 is made of, for example, stainless steel, titanium (Ti), aluminum (Al), or the like. By using such a material, a lightweight and sufficiently strong frame can be configured. By configuring the frame with a metal material, it is possible to obtain an electrical noise countermeasure effect. Moreover, the metal case 5 can also be comprised with resin other than the above metal materials.

  The flexible wiring board 11 includes a conductive pattern including wiring on one surface of a flexible insulating substrate made of polyimide resin or the like, and further includes an insulating layer that covers the conductive pattern from the opposite side of the insulating substrate. Yes, it has flexibility. An LED 18 and an electronic component (IC) 20 are also mounted on the flexible wiring board 11.

  Further, in the liquid crystal display device 50, as shown in FIG. 3, the surface of the convex portion 7a which is a part of the plastic frame 7 is exposed at a part of the bottom surface of the metal case 5. The convex portion 7a is integrally formed with the plastic frame 7 housed in the metal case 5, and the metal case is provided through an opening 5b (see FIG. 9 described later) which is a concave portion provided on the bottom surface of the metal case 5. The bottom surface of 5 is exposed. The convex portion 7 a is a fitting convex portion for fitting and fixing the metal case 5 and the plastic frame 7. The opening 5b is a fitting recess for fitting and fixing the metal case 5 and the plastic frame 7 together. That is, the metal case 5 and the plastic frame 7 are fitted and fixed by fitting the opening 5 b provided in the metal case 5 with the convex portion 7 a that is a part of the plastic frame 7. Since the metal case 5 and the plastic frame 7 are fitted and fixed, they are securely and firmly fixed.

  Further, in the liquid crystal display device 50, as shown in FIG. 3 and FIG. 4, a positioning member 7b when disposed in an electronic device or the like is provided on a part of the bottom surface of the metal case 5. The positioning member 7 b is integrally formed with the plastic frame 7 housed in the metal case 5, and protrudes from the bottom surface of the metal case 5 through an opening 5 c that is a recess provided in the bottom surface of the metal case 5. Is provided. By providing the positioning member 7b, the liquid crystal display device 50 can be easily and accurately placed when placed in an electronic device or the like. Further, since the positioning member 7b is integrally formed in a state of protruding from the bottom surface of the metal case 5 through the opening 5c which is a recess provided on the bottom surface of the metal case 5, it can be formed at any part of the metal case 5. The liquid crystal display device 50 has a high degree of freedom in the arrangement position of the positioning member 7b.

  In the liquid crystal display device 50, as shown in FIGS. 3 and 4, a connection member 7 c for connecting to other members outside the metal case 5 is provided on a part of the bottom surface of the metal case 5. The connection member 7 c is integrally formed with the plastic frame 7 housed in the metal case 5, and protrudes from the bottom surface of the metal case 5 through an opening 5 d that is a recess provided in the bottom surface of the metal case 5. Is provided. By providing the connection member 7c, the liquid crystal display device 50 can be easily and accurately connected when placed in an electronic device or the like. Further, since the connecting member 7c is integrally formed so as to protrude from the bottom surface of the metal case 5 through an opening 5d which is a recess provided on the bottom surface of the metal case 5, it is provided at any part of the metal case 5. The liquid crystal display device 50 has a high degree of freedom in the arrangement position of the connection member 7c.

  FIG. 5 is a plan view of the liquid crystal display device 50 as viewed from the direction of arrow C in FIG. However, FIG. 5 shows a state in which the liquid crystal panel 1, the backlight unit 3, and the flexible wiring board 11 are omitted for convenience of explanation, and a metal sheet 5 is provided with a reflection sheet 9 (not shown) and a plastic frame 7. The state in which the backlight unit 3 including the light guide 17 is housed is described. FIG. 6 is a schematic sectional view showing a longitudinal section of FIG. In FIG. 6, the backlight unit 3 is omitted.

  In this liquid crystal display device 50, as shown in FIGS. 5 and 6, since the plastic frame 7 is integrally formed with the metal case 5, there is a space between the inner surface of the metal case 5 and the side surface of the plastic frame 7. do not do. That is, the inner surface of the metal case 5 and the side surface of the plastic frame 7 are in contact with each other without a gap. This prevents the assembly accuracy from deteriorating due to the gap between the inner surface of the metal case 5 and the side surface of the plastic frame 7. Further, it is possible to prevent the strength, particularly torsional strength, of the assembly structure of the liquid crystal display device 50 from being reduced due to the gap. Therefore, in the liquid crystal display device 50, the plastic frame 7 is integrally formed with the metal case 5, so that a liquid crystal display device having good and sufficient strength is realized.

  Further, in the liquid crystal display device 50, the inner side surface of the metal case 5 and the side surface of the plastic frame 7 are in contact with each other, and there is no gap between the two members, so that the entire liquid crystal display device can be reduced in size. It has been.

  FIG. 7 is an exploded perspective view illustrating the configuration of a conventional liquid crystal display device. As shown in FIG. 7, a conventional liquid crystal display device includes a liquid crystal panel 61 to which a flexible wiring board 71 on which a conductor pattern including wiring, a driving IC chip, and the like are mounted, and a backlight that illuminates the liquid crystal panel 61. The unit 63 is housed in a reflective case 67 made of resin, and these are housed in a metal case 65. Here, like the liquid crystal display device 50, the backlight unit 63 is an optical sheet layer disposed on a light guide. A reflective sheet 69 is disposed between the metal case 65 and the reflective case 67.

  FIG. 8 corresponds to FIG. 6 and is a schematic sectional view showing a longitudinal section of a conventional liquid crystal display device. In FIG. 8, a state in which the reflection sheet 69 and the reflection case 67 are housed in the metal case 65 is illustrated. Such a conventional liquid crystal display device is manufactured by assembling a metal case 65 and a reflection case 67 as shown in FIG. For this reason, since the manufacturing tolerance and the assembly tolerance of each part are required, the gap 66 is generated, and there is a problem that rattling between parts is likely to occur after assembly, and the assembly accuracy is not good. In this case, there arises a problem that the strength of the assembled structure is lowered. Therefore, the conventional liquid crystal display device has a problem that good strength cannot be obtained.

  Further, in the conventional liquid crystal display device, since the above-described tolerance, that is, the gap 66 is necessary, the size of the entire liquid crystal display device is increased by the tolerance, and thus there is a restriction on downsizing of the liquid crystal display device.

  However, in the liquid crystal display device 50, since the plastic frame 7 is integrally formed with the metal case 5, the problems of the conventional liquid crystal display device are solved, and it has good and sufficient strength, and is further compact. A liquid crystal display device that has been realized is realized.

  Next, a method for manufacturing such a liquid crystal display device 50 will be described. First, as shown in FIG. 9, the opening 5a, the opening 5b, the opening 5c, and the opening 5d are formed in a metal case 5 having a thin box-like body and having an upper surface opened. In addition, in FIG. 9, the state which looked at the metal case 5 from the direction of arrow C in FIG. 1 is shown.

  Next, a reflection sheet 9 is laminated on the inner bottom surface of the metal case 5 as shown in FIG. Then, as shown in FIG. 11, the constituent material of the plastic frame 7 is poured into a predetermined position in the metal case 5 and the plastic frame 7 is integrally formed with the metal case 5 by injection molding. At this time, since the constituent material of the plastic frame 7 flows into the opening 5b, the opening 5c, and the opening 5d of the metal case 5, the opening 5b, the opening 5c, and the opening 5d are also part of the plastic frame 7. A certain convex portion 7a is formed (not shown in FIG. 11), whereby the convex portion 7a and the opening 5b are fitted, and the metal case 5 and the plastic frame 7 are fitted and fixed. The positioning member 7b and the connecting member 7c are also integrally formed through the opening 5b and the opening 5c, respectively, when the plastic frame 7 is integrally formed (not shown in FIG. 11).

  Next, as shown in FIG. 12, the light guide 17 (light unit 3) provided with the optical sheet layer 15 is accommodated in the plastic frame 7. Then, the liquid crystal panel 1 to which the flexible wiring board 11 is connected is accommodated in the metal case 5 and fixed. The liquid crystal panel 1 and the light guide unit 3 are fixed by attaching the liquid crystal panel 1 and the light guide unit 3 at the outer peripheral edge of the surface of the liquid crystal panel 1 using a light-shielding double-sided tape 19. Finally, the flexible wiring board 11 is bent and fixed so as to overlap the back surface of the metal case 5 (surface opposite to the liquid crystal panel 1). By performing the above steps, the liquid crystal display device 50 according to the present embodiment having the above-described advantages can be manufactured.

  In addition, in the above, although the case where the reflective sheet 9 was used was demonstrated, it is not limited to this in this invention, The structure which mirror-finished the inner surface of the metal case 5 instead of providing the reflective sheet 9, and the reflective plate were stuck. It can also be configured.

  In Example 2, another embodiment of the liquid crystal display device according to the present invention will be described. Since the basic structure is the same as that of the first embodiment described above, the characteristic part will be described below. FIG. 13 is a diagram for explaining another liquid crystal display device according to the present invention, and is a plan view seen from the direction of arrow C in FIG. However, FIG. 13 shows a state in which the liquid crystal panel 1, the backlight unit 3, and the flexible wiring board 11 are excluded for convenience of explanation, as in FIG. 5, and a reflective sheet 9 (however, not shown) is shown. ), A state in which the backlight unit 3 including the plastic frame 7 and the light guide 17 is housed is described.

  In this liquid crystal display device, the plastic frame 7 is integrally formed with the metal case 5 similarly to the liquid crystal display device 50 described in the first embodiment. Therefore, the liquid crystal display device according to the present embodiment also has the effect of the liquid crystal display device 50 described in the first embodiment.

  In the liquid crystal display device according to the present embodiment, the light guide 17 is further integrally formed with the plastic frame 7. That is, in the conventional liquid crystal display device described in the first embodiment, it is possible to prevent the assembly accuracy from being deteriorated due to the gap between the reflection case 67 and the backlight unit 6 (light guide). Thereby, the positional accuracy of the light guide 17 is improved. Further, it is possible to prevent the strength as an assembly structure of the liquid crystal display device, particularly the torsional strength, from being reduced due to the gap. Therefore, in this liquid crystal display device, since the light guide 17 is integrally formed with the plastic frame 7, a liquid crystal display device having better and sufficient strength is realized.

  In the liquid crystal display device according to the present embodiment, the inner side surface of the plastic frame 7 and the side surface of the light guide 17 are in contact with each other, and there is no gap between the two members. The size is reduced.

  Next, a method for manufacturing such a liquid crystal display device will be described. First, as shown in FIG. 14, an opening 5a, an opening 5b, an opening 5c, and an opening 5d are formed in a metal case 5 having a thin box-like body and having an upper surface opened. In addition, in FIG. 14, the state which looked at the metal case 5 from the direction of arrow C in FIG. 1 is shown.

  Next, a reflection sheet 9 is laminated on the inner bottom surface of the metal case 5 as shown in FIG. Then, as shown in FIG. 16, the constituent material of the plastic frame 7 is poured into a predetermined position in the metal case 5, and the plastic frame 7 is integrally formed with the metal case 5 by injection molding. At this time, since the constituent material of the plastic frame 7 flows into the opening 5b, the opening 5c, and the opening 5d of the metal case 5, the opening 5b, the opening 5c, and the opening 5d are also part of the plastic frame 7. A certain convex portion 7a is formed (not shown in FIG. 16). Thus, the convex portion 7a and the opening 5b are fitted, and the metal case 5 and the plastic frame 7 are fitted and fixed. Further, the positioning member 7b and the connecting member 7c are also integrally formed through the opening 5b and the opening 5c, respectively, when the plastic frame 7 is integrally formed (not shown in FIG. 16).

  Next, as shown in FIG. 17, the constituent material of the light guide 17 is poured into the plastic frame 7, and the light guide 17 is integrally formed with the plastic frame 7 by injection molding. At this time, it is necessary to manage the melting point of the material of the plastic frame 7 and the melting point of the material of the light guide 17. When the melting point of the material of the plastic frame 7 is lower than the melting point of the material of the light guide 17, the plastic frame 7 that has already been formed melts when the light guide 17 is integrally formed in the plastic frame 7. It is. Therefore, it is important to select a material having a melting point higher than that of the light guide 17 as the material of the plastic frame 7.

  Then, the optical sheet layer 15 is disposed on the light guide body 17. Subsequent steps are the same as those in the first embodiment. As described above, the liquid crystal display device according to this embodiment having the above-described advantages can be manufactured.

  In Example 3, still another embodiment of the liquid crystal display device according to the present invention will be described. Since the basic structure is the same as that of the first embodiment described above, the characteristic part will be described below. 18 is a diagram for explaining another liquid crystal display device according to the present invention, and is a plan view seen from the direction of arrow C in FIG. However, in FIG. 18, as in FIG. 5, for convenience of explanation, the liquid crystal panel 1, the backlight unit 3, and the flexible wiring board 11 are not shown, and the metal case 5 is provided with a reflection sheet 9 (not shown). ), A state in which the backlight unit 3 including the plastic frame 7 and the light guide 17 is housed is described.

  In this liquid crystal display device, other members are integrally formed with the metal case 5 in the metal case 5 in the same manner as the liquid crystal display device 50 described in the first and second embodiments. Therefore, the liquid crystal display device according to the present embodiment also has the effect of the liquid crystal display device 50 described in the first embodiment.

  The liquid crystal display device according to the present embodiment is different from the liquid crystal display device 50 described in the first embodiment in that the light guide 17 is integrally formed with the metal case 5 without providing the plastic frame 7, and the metal The reflection sheet 9 is also provided on the inner surface of the case 5. In this liquid crystal display device 50, as shown in FIG. 18, the light guide 17 is formed integrally with the metal case 5 without providing the plastic frame 7, so that it is smaller than the liquid crystal display device according to the second embodiment. It is planned.

  Further, there is no space between the inner side surface of the metal case 5 and the side surface of the light guide body 17. That is, the inner side surface of the metal case 5 and the side surface of the light guide 17 are in contact with each other without any gap. This prevents the assembly accuracy from deteriorating due to the gap between the inner surface of the metal case 5 and the side surface of the light guide 17. Further, it is possible to prevent the strength as an assembly structure of the liquid crystal display device, particularly the torsional strength, from being reduced due to the gap. Therefore, in this liquid crystal display device, the light guide 17 is formed integrally with the metal case 5 to realize a liquid crystal display device having good and sufficient strength.

  Moreover, since the light guide 17 is integrally formed with the metal case 5, the light guide 17 and the reflection sheet 9 can be brought into close contact with each other. That is, since there is no air layer between the reflective layer 9 and the light guide 17, higher reflectance can be obtained and luminance can be improved.

  Next, a method for manufacturing such a liquid crystal display device will be described. First, as shown in FIG. 19, an opening 5a, an opening 5b, an opening 5c and an opening 5d are formed in a metal case 5 having a thin box-like body and having an upper surface opened. In addition, in FIG. 19, the state which looked at the metal case 5 from the direction of arrow C in FIG. 1 is shown.

  Next, as shown in FIG. 20, the reflection sheet 9 is laminated on the inner bottom surface and the inner side surface of the metal case 5. Then, as shown in FIG. 21, the constituent material of the light guide 17 is poured into a predetermined position in the metal case 5, and the light guide 17 is integrally formed with the metal case 5 by injection molding. At this time, since the constituent material of the light guide 17 also flows into the opening 5b, the opening 5c, and the opening 5d of the metal case 5, one of the light guides 17 also enters the opening 5b, the opening 5c, and the opening 5d. The convex portion 7a which is a portion is formed (not shown in FIG. 21). As a result, the convex portion 7a and the opening 5b are fitted, and the metal case 5 and the light guide 17 are fitted and fixed. The Further, the positioning member 7b and the connecting member 7c are also integrally formed through the opening 5b and the opening 5c, respectively, when the light guide 17 is integrally formed (not shown in FIG. 21).

  Then, the optical sheet layer 15 is disposed on the light guide body 17. Subsequent steps are the same as those in the first embodiment. As described above, the liquid crystal display device according to this embodiment having the above-described advantages can be manufactured.

  In the fourth embodiment, a specific example of an electronic apparatus including the electro-optical device described in the above-described embodiments will be described. FIG. 22 to FIG. 24 are examples of electronic apparatuses equipped with the above-described liquid crystal display device according to the present invention. FIG. 22 is a perspective view illustrating an example of a mobile phone. In FIG. 22, reference numeral 100 denotes a mobile phone body, of which 101 is a display unit comprising the liquid crystal display device according to the present invention. FIG. 23 is a perspective view illustrating an example of a wristwatch-type electronic device. In FIG. 23, reference numeral 110 denotes a watch body having a built-in watch function, and 111 denotes a display unit comprising the liquid crystal display device according to the present invention. FIG. 24 is a perspective view showing an example of a portable information processing apparatus such as a word processor or a personal computer. In FIG. 24, 120 denotes a portable information processing device, 122 denotes an input unit such as a keyboard, 124 denotes an information processing device main unit storing arithmetic means, storage means, and the like, and 126 denotes a liquid crystal display according to the present invention. It is the display part which consists of an apparatus.

  If the liquid crystal display device according to the present invention is used for these electronic devices, high-quality electronic devices can be realized. Note that electronic devices are not limited to these as long as a liquid crystal display device can be mounted thereon. Therefore, as an electronic device equipped with such a liquid crystal display device, in addition to the mobile phone shown in FIG. 22, the wristwatch-type electric device shown in FIG. 23, the portable information processing device shown in FIG. , Digital still cameras, in-vehicle monitors, digital video cameras, viewfinder type or monitor direct-view type video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, workstations, video phones, POS terminals, and other liquid crystal display devices Can be mentioned.

  As described above, the liquid crystal display device according to the present invention is useful for electronic devices having a liquid crystal display screen, and is particularly suitable for portable devices such as mobile phones and other mobile communication devices.

It is a disassembled perspective view explaining the structure of a liquid crystal display device. It is principal part sectional drawing explaining the structure of a liquid crystal display device. It is a bottom view explaining the structure of a liquid crystal display device. It is a side view explaining the structure of a liquid crystal display device. It is a top view of a liquid crystal display device. It is a schematic sectional drawing which shows the longitudinal cross-section of FIG. It is a disassembled perspective view explaining the structure of the conventional liquid crystal display device. It is a schematic sectional drawing which shows the longitudinal cross-section of the conventional liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a figure explaining the other liquid crystal display device concerning this invention. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a figure explaining the other liquid crystal display device concerning this invention. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a top view explaining the manufacturing method of a liquid crystal display device. It is a perspective view which shows an example of the conventional liquid crystal display device. It is a disassembled perspective view which shows schematic structure of the conventional liquid crystal display device. It is principal part sectional drawing explaining the structure of the conventional liquid crystal display device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel, 3 Backlight unit, 5 Metal case, 5a, 5b, 5c, 5d Opening part, 7 Plastic frame, 7c Connection member, 9 Reflective sheet, 11 Flexible wiring board, 15 Optical sheet layer, 17 Light guide, 19 light-shielding double-sided tape, 21 substrate, 23 substrate, 25 liquid crystal, 27 polarizing plate, 29 polarizing plate, 50 liquid crystal display device

Claims (7)

LCD panel,
A light source;
A light guide disposed opposite to the liquid crystal panel and guiding the light from the light source to illuminate the liquid crystal panel;
A plastic frame that houses the light guide and surrounds a side surface of the light guide along an outer shape of the light guide ;
A metal container including a side surface and a bottom surface for accommodating the liquid crystal panel, the light guide, and the plastic frame;
A liquid crystal display device comprising:
The plastic frame is integrally formed in a state of being in contact with the side surface and the bottom surface on the inner surface side of the metal container by injection molding, the metal container is provided with an opening , The liquid crystal display device is characterized in that a convex portion fitted into the opening is formed by the material constituting the plastic frame flowing into the opening during the injection molding.   The liquid crystal display device according to claim 1, wherein the opening of the metal container is provided on the bottom surface of the metal container.   A plurality of the convex portions that fit into the opening of the metal container are provided and protruded to the outer surface side of the metal container, and are used for positioning with an electronic device on which the liquid crystal display device is mounted. 3. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device.   A reflective sheet is disposed between the bottom surface of the metal container and the light guide, and an end of the reflective sheet is disposed between the plastic frame and the bottom surface of the metal container. Thus, the plastic frame is integrally formed in a state of being in contact with the side surface and the bottom surface on the inner surface side of the metal container by injection molding. 2. A liquid crystal display device according to item 1.   5. The liquid crystal display device according to claim 1, wherein the light guide is integrally formed in an opening of the plastic frame that accommodates the light guide. 6.   An electronic apparatus comprising the liquid crystal display device according to claim 1. LCD panel,
A light source;
A light guide disposed opposite to the liquid crystal panel and guiding the light from the light source to illuminate the liquid crystal panel;
A plastic frame that houses the light guide and surrounds a side surface of the light guide along an outer shape of the light guide ;
A metal container including a side surface and a bottom surface for accommodating the liquid crystal panel, the light guide, and the plastic frame;
A method of manufacturing a liquid crystal display device having
Forming an opening in the metal container;
A step of pouring the constituent material of the plastic frame into the inner surface side of the metal container so as to contact the side surface and the bottom surface on the inner surface side of the metal container, and integrally molding the metal container and the plastic frame When,
Including
The step of integrally molding the metal container and the plastic frame includes:
A method for manufacturing a liquid crystal display device, wherein the plastic frame is formed with convex portions fitted into the opening by causing the constituent material of the plastic frame to flow into the opening of the metal container.

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