JP2007279593A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of preventing the disconnection of an FPC while easily arranging the FPC mounting an LED in a frame. <P>SOLUTION: In the liquid crystal display device constituted of arranging an LED 9, an FPC 10, a light guide plate 8, optical sheets 4 to 7, and a liquid crystal cell 2 in a frame 11, projecting and laying the end part 10a of the FPC 10 from the frame 11 so as to be connected to a connector formed on the rear side of the frame 11: the LED 9 is mounted on a straight portion 10d of the L-shaped FPC 10 so that light is radiated to the opposite side of the FPC 10, a groove 11b is formed so as to engage the direct-below portion 10d of the longitudinally arranged FPC 10 along one edge of the frame 11 and hold the straight portion, a recessed portion 11c is formed so as to engage the LED 9 on the center side of the frame 11 from the groove 11b to face the LED 9 to the end surface 8a of the light guide plate 8, and a hole 11e to be projected to the rear side of the frame 11 through the end part 10a of the FPC 10 and the straight portion 10c is formed on the bottom of the groove 11b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure in which an FPC on which an LED as a light source of a liquid crystal display device is mounted is held in a frame and one end of the FPC protrudes from the frame.

  FIG. 6 is a perspective view showing an exploded state of the conventional liquid crystal display device 50. FIG. 7 is a perspective view showing an assembled state of the liquid crystal display device 50. 6 and 7 are reversed in direction. FIG. 8 is a side view showing a usage state of the liquid crystal display device 50. 9A is a cross-sectional view taken along the line AA in FIG. 9B is a cross-sectional view taken along the line BB in FIG. The liquid crystal display device 50 is a small liquid crystal module and is incorporated in an electronic device such as a printer, a mobile phone, or a digital still camera. As shown in FIG. 6, the liquid crystal display device 50 includes a bezel 51, a liquid crystal cell 52, an FPC (Flexible Print Cable) 53, optical sheets 54 to 57, a light guide plate 58, and an LED (Light Emitting Diode). 59, FPC 60, and frame 61.

  The bezel 51 is made of sheet metal and has a rectangular frame shape. A rectangular hole 51 a is formed on each side surface of the bezel 51. The liquid crystal cell 52 displays a color image on the display area 52a by light incident from the back side (lower side). The FPC 53 is connected to the glass substrate 52b of the liquid crystal cell 52 by ACF (Anisotropic Conductive Film) or the like. The FPC 53 is formed in a rectangular shape and has a relatively large width. In the FPC 53, wirings and circuits for inputting signals and power for driving the liquid crystal cell 52 are formed. The FPC 60 is formed in an L shape and has a relatively small width. A plurality (three in this example) of LEDs 59 are mounted at a predetermined interval on the straight portion 60d having a long length toward the end portion 60b of the FPC 60. The LED 59 is a side-view white LED, and emits light from a side surface 59a opposite to the end 60a of the FPC 60. In the FPC 60, wiring for supplying electric power for driving the LED 59 is formed.

  The frame 61 is made of a white synthetic resin and is formed in a rectangular frame shape. Locks 61 a are formed on the side surfaces of the frame 61 so as to correspond to the holes 51 a of the bezel 51. The frame 61 is formed in a size that can accommodate the liquid crystal cell 52, the optical sheets 54 to 57, the light guide plate 58, the LED 59, and the FPC 60. In the vicinity of one edge in the frame of the frame 61, a support portion 61b that receives and supports the FPC 60 and a recess 61c into which the LED 59 is fitted are formed. At one edge of the frame 61, an opening 61d for projecting the end 53a of the FPC 53 and an opening 61e for projecting the end 60a of the FPC 60 and the straight portion 60c having a short length toward the end 60a are formed. ing.

  The light guide plate 58 is disposed on the side of the support portion 61 b and the recess 61 c of the frame 61. The light emitted from the LED 59 enters from one end surface 58a of the light guide plate 58 and is diffused inside the light guide plate 58, and then from either the front surface (upper surface) or the back surface (lower surface) of the light guide plate 58. The light is emitted in a planar shape. The optical sheets 54 to 57 include lens sheets 54 and 55, a diffusion sheet 56, and a reflection sheet 57. The reflection sheet 57 is disposed on the back side of the light guide plate 58. The light emitted from the back surface of the light guide plate 58 is reflected to the front side of the light guide plate 58 by the reflection sheet 57. The diffusion sheet 56 and the lens sheets 55 and 54 are stacked between the front surface of the light guide plate 58 and the liquid crystal cell 52. Light emitted from the front surface of the light guide plate 58 is diffused by the diffusion sheet 56, collected by the lens sheets 54 and 55, and incident on the entire liquid crystal cell 52. The light collection rates of the lens sheets 54 and 55 are different.

  As an example of the assembly procedure of the liquid crystal display device 50, first, as shown in FIGS. 9A and 9B, the reflective sheet 57 is inserted into the frame 61 while being bent from the back side (downward). The reflection sheet 57 is held by the claws 61 f formed on the frame 61 so as not to come off to the back side. Next, the light guide plate 58 is fitted into the frame 61 from the front side (above) and placed on the reflection sheet 57, and one end surface 58a is placed on the side surface 61g of the support portion 61b as shown in FIG. 9B. Close or close. Next, a double-sided tape 62 is attached to the LED 59 side surface of the straight portion 60d of the FPC 60, and a single-sided tape 63 that shields the light from the LED 59 while reinforcing the FPC 60 is attached to the surface opposite to the LED 59. Then, the FPC 60 is inserted into the frame 61 from the front side in a lateral direction, and the LED 59 is fitted into the recess 61c as shown in FIG. 9A, so that the light emitting surface 59a is in close contact with the end surface 58a of the light guide plate 58. Alternatively, the straight portion 60 d is placed on the support portion 61 b and the light guide plate 58 and is fixed to the light guide plate 58 with the double-sided tape 62. 9B, the end portion 60a and the straight portion 60c of the FPC 60 are passed through the opening 61e of the frame 61 and the opening 51e formed on one side surface of the bezel 51 from the inside of the frame 61. , Projecting to the side of the frame 61.

  The arrangement structure of the LED 59 and the FPC 60 as described above is disclosed in, for example, the following Patent Documents 1, 2, and 3. As described above, when the light emitting surface 59a of the LED 59 and the end surface 58a of the light guide plate 58 are brought into close or close proximity, the light utilization efficiency of the LED 59 is increased. In particular, the light utilization efficiency of the LED 59 becomes higher when the light emitting surface 59a and the end surface 58a are brought closer to each other. Further, the light utilization efficiency of the LEDs 59 is higher when the light emitting surfaces 59a of the respective LEDs 59 are brought closer to each other in parallel at the same distance rather than being inclined closer to the end surface 58a. However, when the FPC 60 is inserted into the frame 61, the light emitting surface 59a of the LED 59 and the end surface 58a of the light guide plate 58 are hidden by the FPC 60 and cannot be seen, so the light emitting surface 59a and the end surface 58a are in close contact with each other or at the same distance. It is very difficult to position and fix the FPC 60 and the LED 59 with high precision so that they are close to each other in parallel. Further, since the FPC 60 is small, it takes time and effort to attach the two types of tapes 62 and 63. On the other hand, Patent Literature 4 below discloses a method for positioning LEDs and FPCs. However, it is difficult to adopt this positioning method in this example because the FPC 60 is small. Further, in Patent Document 5 below, a concave portion for fitting an LED is provided in the light guide plate, and the FPC on which the LED is mounted is in a vertically oriented state and is brought into close contact with the end surface of the light guide plate and fixed with a double-sided tape. A structure is disclosed in which the end portion of the frame protrudes laterally through an opening formed in the side surface of the frame. However, even in this structure, since the FPC is small and the area of the FPC LED mounting surface and the end surface of the light guide plate is small, it takes time to attach the tape.

  When the FPC 60 is arranged in the frame 61 as described above, the diffusion sheet 56 and the lens sheets 55 and 54 are laminated, and fitted into the frame 61 from the front side and placed on the light guide plate 58. , Located on the side of the FPC 60 and the tapes 62 and 63. Next, the liquid crystal cell 52 is fitted into the frame 61 from the front side and placed on the lens sheet 54 and the single-sided tape 63. Further, as shown in FIG. 9A, the end portion 53a of the FPC 53 passes through the opening 61d of the frame 61 and the opening 51d formed on one side surface of the bezel 51 from the inside of the frame 61. Project to the side. Finally, the bezel 51 is covered from the front side of the frame 61, and the locks 61a of the frame 61 are fitted into the holes 51a of the bezel 51 as shown in FIG. 7, and the bezel 51 is attached to the front side of the frame 61.

  When the liquid crystal display device 50 assembled as described above is installed in a narrow installation space of an electronic device, a control board 70 for controlling the liquid crystal display device 50 is disposed on the back side of the liquid crystal display device 50 as shown in FIG. . The distance between the liquid crystal display device 50 and the control board 70 is about the height of the connectors 71 and 72 for electrically connecting the FPCs 53 and 60 and the control board 70. For this reason, in order to fit and connect the end portions 53a and 60a of the FPCs 53 and 60 to the connectors 71 and 72, it is necessary to bend the FPCs 53 and 60 180 degrees as disclosed in Patent Document 4. . However, in that case, the FPC 60 is narrow in width, weak in strength, high in flexibility, and easy to handle. Therefore, excessive force is concentrated and disconnection occurs. If the FPC 60 is thus disconnected, the liquid crystal display device 50 becomes a defective product in a later inspection process. Further, when the FPC is vertically oriented and protrudes sideways from the side surface of the frame as in Patent Document 5, the routing of the FPC becomes more complicated, and disconnection is likely to occur.

JP 2005-321586 A JP 2004-349019 A JP 2005-173302 A JP-A-2005-77756 JP 2005-294172 A

  The present invention solves the above-described problems, and the problem is to prevent the FPC from being disconnected while allowing the FPC with the LED mounted thereon to be easily placed within the frame. An object of the present invention is to provide a liquid crystal display device that can perform the above-described operation.

  In the present invention, an FPC in which an LED as a light source is mounted, a light guide plate that makes light emitted from the LED incident from one end face, diffuses inside and emits in a planar shape, reflects light emitted from the light guide plate, An optical sheet for diffusing and condensing and a liquid crystal cell are arranged in the frame of the frame, and one end of the FPC is protruded from the frame of the frame so as to be connected to a connecting member arranged on the back side of the frame. In the liquid crystal display device that is drawn around, the FPC is formed in an L shape, and the LED is mounted on the other straight part toward the other end of the FPC so as to emit light to the opposite side of the FPC. A groove is provided along one edge to hold the other straight portion with the FPC in a vertical orientation, and the LED is fitted to the center side of the frame from the groove so as to face one end surface of the light guide plate. A recess is provided The bottom surface of one end portion of the groove, one end portion and one of the straight portion toward the end portion of the FPC by through providing holes to protrude to the back side of the frame.

  In this way, with the FPC with the LED mounted vertically, the other straight part of the FPC is fitted into a groove provided near one edge in the frame of the frame, the LED is fitted into the recess, and the hole is inserted into the hole. By penetrating one end portion and straight portion of the FPC, the other straight portion of the FPC is held in the groove, and the light emitting surface of the LED faces one end surface of the light guide plate. The end portion and the straight portion protrude toward the back side of the frame. Therefore, even if the FPC is not fixed to the light guide plate or the frame with a double-sided tape or the like, the light emitted from the LED can be reliably incident on one end surface of the light guide plate by holding it in the groove of the frame. . Moreover, even if it does not position FPC and LED accurately, the light emission surface of LED can be made to adjoin at least in parallel with one end surface of a light-guide plate. Furthermore, even if one straight portion of the FPC is not bent and routed at a large angle of about 180 ° or greater than 180 °, the FPC can be bent and routed at a small angle of about 90 ° or less than 90 °, The end can be connected to a connection member arranged on the back side of the frame. Therefore, it is possible to easily dispose the FPC on which the LED is mounted within the frame, and to prevent disconnection of the FPC.

  In one embodiment of the present invention, in the above, the other straight part of the FPC is provided with a close contact member for bringing the straight part into close contact with the side surface of the groove.

  Since the FPC is generally thin, it is very difficult to form a groove in the frame with a minute width substantially equal to the thickness of the FPC so that the FPC can be held without rattling. However, according to the above, a groove having a width larger than the thickness of the FPC is easily formed in the frame, the gap between the groove and the other straight portion of the FPC is filled with a close member, and the other FPC in the groove is filled. It is possible to reliably prevent the straight portion from rattling, and light emitted from the LED can be stably incident on one end face of the light guide plate.

  In one embodiment of the present invention, in the above, the width of the concave portion perpendicular to the groove is set to be equal to or less than the distance from the other straight portion of the FPC to the surface emitting the LED light.

  In this way, the light emission surface of the LED can be flush with or protrude from the side surface of the recess on the light guide plate side, and the light emission surface is brought into close contact with one end surface of the light guide plate to It is possible to increase the use efficiency.

  Further, in an exemplary embodiment of the present invention, an FPC on which a reflection sheet, a light guide plate, a diffusion sheet, a lens sheet, a liquid crystal cell, and an LED as a light source are mounted is disposed in the frame, and the bezel is placed on the front surface of the frame. In the liquid crystal display device that is attached to the side and protrudes from the frame so that one end of the FPC is connected to a connector disposed on the back side of the frame, the FPC is formed in an L shape, and the other end of the FPC The LED is mounted on the other straight part toward the end of the FPC so that light is emitted perpendicularly to the FPC on the opposite side of the FPC, and the FPC is vertically oriented along one edge in the frame of the frame. In this state, a groove for fitting and holding the other straight portion is provided, and a recess for fitting the LED and facing one end surface of the light guide plate is provided on the center side of the frame from the groove, and the other straight portion of the FPC is provided. On the opposite side of the LED, a close contact member is provided for bringing the straight portion into close contact with the side surface of the groove on the concave side, and the width of the concave portion perpendicular to the groove is set to be a surface that emits LED light from the other straight portion of the FPC. And a hole is formed in the bottom surface of one end of the groove so as to penetrate one end of the FPC and one straight portion toward the end and project to the back side of the frame.

  In this way, with the FPC on which the LED is mounted oriented vertically, the other straight part of the FPC is fitted into the groove in the frame of the frame, the LED is fitted into the concave part, and one end of the FPC and the straight part are fitted into the hole. By penetrating the portion, the other straight portion of the FPC is held in close contact with the side surface of the groove on the recess side by the close contact member, and does not rattle. Further, the light emission surface of the LED is flush with the side surface of the concave portion on the light guide plate side or protrudes from the side surface, and comes into close contact with one end surface of the light guide plate. Furthermore, one end portion and straight portion of the FPC protrude from the inside of the frame to the back side. For this reason, even if the FPC is not fixed to the light guide plate or the frame with a double-sided tape or the like, the FPC is securely held in the groove of the frame so that the light emitted from the LED is stably incident on one end surface of the light guide plate. Even if the FPC and the LED are not accurately positioned, the light emitting surface of the LED can be easily brought into close contact with one end surface of the light guide plate, and the light use efficiency of the LED can be further enhanced. . In addition, even if one straight part of the FPC is not bent at a large angle of about 180 ° or greater than 180 °, the FPC can be bent at a small angle of about 90 ° or less than 90 ° to draw one of the FPCs. The end can be connected to a connector disposed on the back side of the frame. Therefore, it is possible to easily dispose the FPC on which the LED is mounted within the frame, and to prevent disconnection of the FPC.

  According to the present invention, the LED and the FPC on which the LED is mounted are accurately positioned and fixed to the light guide plate or the frame with a double-sided tape or the like. Can be connected in parallel to one end face of the light guide plate, and can be connected to the connecting member on the back side of the frame by bending the FPC at a small angle of about 90 °, so the FPC can be easily placed in the frame of the frame In this way, disconnection of the FPC can be prevented.

  FIG. 1 is a perspective view showing an exploded state of a liquid crystal display device 100 according to an embodiment of the present invention. FIG. 2 is a perspective view showing an assembled state of the liquid crystal display device 100. 1 and 2 are reversed in direction. FIG. 3 is a side view showing the usage state of the liquid crystal display device 100. 4A is a cross-sectional view taken along the line AA in FIG. 4B is a cross-sectional view taken along line BB in FIG. 4C is a cross-sectional view taken along the line CC of FIG. The liquid crystal display device 100 is a small liquid crystal module and is incorporated in an electronic device such as a printer, a mobile phone, or a digital still camera. As shown in FIG. 1, a liquid crystal display device 100 includes a bezel 1, a liquid crystal cell 2, an FPC (Flexible Print Cable) 3, optical sheets 4 to 7, a light guide plate 8, and an LED (Light Emitting Diode). 9, the FPC 10 and the frame 11.

The bezel 1 is made of sheet metal and is formed in a rectangular frame shape. A rectangular hole 1 a is formed on each side surface of the bezel 1. The liquid crystal cell 2 displays a color image on the display area 2a by light incident from the back side (downward). On the glass substrate 2b of the liquid crystal cell 2, FPC3 is ACF (anisotropic conductive film: Anisotropic).
Connected by Conductive Film). The FPC 3 is formed in a rectangular shape and has a relatively large width. In the FPC 3, wirings and circuits for inputting signals and power for driving the liquid crystal cell 2 are formed. The FPC 10 is formed in an L shape and has a relatively small width. A plurality (three in this example) of LEDs 9 are mounted at predetermined intervals on the straight portion 10d having a long length toward the end portion 10b of the FPC 10. The LED 9 is a front-view type white LED, and emits light perpendicularly to the FPC 10 from the front surface 9 a to the side opposite to the FPC 10. In the FPC 10, wiring for supplying electric power for driving the LED 9 is formed.

  The frame 11 is made of a white synthetic resin and is formed in a rectangular frame shape. Locks 11 a are formed on the side surfaces of the frame 11 so as to correspond to the holes 1 a of the bezel 1. The inside of the frame 11 is formed in a size that can accommodate the liquid crystal cell 2, the optical sheets 4 to 7, the light guide plate 8, the LED 9, and the FPC 10. A groove 11b is provided along one edge of the frame 11 so as to fit and hold the straight portion 10d in a state where the FPC 10 is oriented vertically as shown in FIGS. 1 and 4A. On the center side of the frame 11 from the groove 11b, there is provided a recess 11c for fitting the LED 9 so as to face one end face 8a of the light guide plate 8 as shown in FIGS. On the opposite side of the straight portion 10d of the FPC 10 from the LED 9, as shown in FIGS. 4A and 4B, a gap between the groove 11b and the straight portion 10d is filled to reinforce the straight portion 10d and to the side surface of the groove 11b on the concave portion 11c side. A close contact member 12 is provided for close contact.

The close contact member 12 is configured, for example, by attaching a single-sided tape to the entire surface of the straight portion 10d opposite to the LED 9. As described above, it is easier to apply the single-sided tape to the entire surface of the straight portion 10d on the side opposite to the LED 9 than to apply it to a part of the surface or to the surface of the straight portion 10d on the LED 9 side. . Other than this, for example, as the close contact member 12, synthetic resin, metal, synthetic rubber, sponge, cloth, or the like is used as an adhesive or the like on the surface of the straight portion 10d opposite to the LED 9 or the side opposite to the recess 11c of the groove 11b. Or may be inserted on the opposite side of the LED 9 of the straight portion 10d in the groove 11b. Further, any one of the above members is provided as a close contact member on the LED 9 side of the straight portion 10d in the groove 11b so that the straight portion 10d is in close contact with the side surface of the groove 11b opposite to the recess 11c. Also good.

  The width of the recess 11c perpendicular to the groove 11b and the FPC 10 is set to be equal to or less than the distance from the straight portion 10d of the FPC 10 to the light emitting surface 9a of the LED 9. For this reason, the light emission surface 9a of the LED 9 is flush with the side surface 11d of the recess 11c on the light guide plate 8 side or protrudes from the side surface 11d. As shown in FIGS. 1 and 4B, the bottom surface of one end of the groove 11b penetrates the end portion 10a of the FPC 10 and the straight portion 10c toward the end portion 10a so as to protrude toward the back side of the frame 11. Is provided. As shown in FIGS. 1 and 4A, an opening 11f that projects the end 3a of the FPC 3 is formed on one edge of the frame 11.

  The light guide plate 8 is disposed on the side of the recess 11c of the frame 11 as shown in FIGS. 4A and 4B. The end face 8a of the light guide plate 8 is close to the inner side face 11d of the frame 11, and the other end faces are close to the side faces located at the same height as the inner side face 11d of the frame 11, for example, as shown in FIG. 4C. Yes. Light emitted from the LED 9 is incident from one end surface 8a of the light guide plate 8 and diffused inside the light guide plate 8, and then from either the front surface (upper surface) or the back surface (lower surface) of the light guide plate 8. The light is emitted in a planar shape. The optical sheets 4 to 7 include lens sheets 4 and 5, a diffusion sheet 6, and a reflection sheet 7. The reflection sheet 7 is disposed on the back side of the light guide plate 8. The reflection surface of the reflection sheet 7 is close to the back surface of the light guide plate 8, and each end surface is close to each side surface located below the light guide plate 8 inside the frame 11. The light emitted from the back surface of the light guide plate 8 is reflected to the front side of the light guide plate 8 by the reflection sheet 7. The diffusion sheet 6 and the lens sheets 5 and 4 are disposed between the front surface of the light guide plate 8 and the liquid crystal cell 2. The back surface of the diffusion sheet 6 is close to the front surface of the light guide plate 8 and the top surface of the recess 11 c of the frame 11. The front surface of the lens sheet 4 is close to the back surface of the liquid crystal cell 2. The end faces of the diffusion sheet 6 and the lens sheets 5, 4 on the FPC 10 side are close to the straight portion 10 d of the FPC 10, and the other end faces are close to the side faces located above the light guide plate 8 inside the frame 11. The light emitted from the front surface of the light guide plate 8 is diffused by the diffusion sheet 6, condensed by the lens sheets 4 and 5, and incident on the entire liquid crystal cell 2. The light collection rates of the lens sheets 4 and 5 are different.

  The back surface of the liquid crystal cell 2 is close to the front surface of the lens sheet 4, the FPC 10, and the upper end portion of the close contact member 12. The front surface of the liquid crystal cell 2 is in contact with the inner surface of the bezel 1 for grounding. Shaking of the FPC 10 in the width direction of the groove 11 b is suppressed by the close contact member 12, and rattling of the FPC 10 in the vertical direction of the groove 11 b is suppressed by the liquid crystal cell 2.

  As an example of the assembly procedure of the liquid crystal display device 100, first, as shown in FIGS. 4A to 4C, the reflective sheet 7 is inserted into the frame 11 while being bent from the back side (downward). The reflection sheet 7 is held by a claw 11g formed on the frame 11 so as not to be detached to the back side. Next, the light guide plate 8 is fitted into the frame 11 from the front side (upper side) and placed on the reflection sheet 7, and one end surface 8 a is attached to the side surface of the frame 11 as shown in FIGS. 4A and 4B. Close or close to 11d. Next, the close contact member 12 is provided on the entire surface of the straight portion 10d of the FPC 10 opposite to the LED 9. Then, with the FPC 10 vertically oriented as shown in FIG. 1, the straight portion 10d and the close contact member 12 of the FPC 10 are fitted into the groove 11b from the front side of the frame 11 as shown in FIG. 4A, and the LED 9 is fitted into the recess 11c. The FPC 10 is held in the groove 11b by bringing the light emitting surface 9a into close contact with or close to the end surface 8a of the light guide plate 8. Further, as shown in FIG. 4B, the end portion 10 a and the straight portion 10 c of the FPC 10 are projected from the inside of the frame 11 through the hole 11 e on the bottom surface of the groove 11 b to the rear side of the frame 11.

  Next, the diffusion sheet 6 and the lens sheets 5 and 4 are laminated, fitted into the frame 11 from the front side, and placed on the front surface of the light guide plate 8, the upper surface of the LED 9, and the upper surface of the recess 11c. And beside. Next, the liquid crystal cell 2 is fitted into the frame 11 from the front side and placed on the lens sheet 4, the FPC 10, and the close contact member 12. Further, as shown in FIG. 4A, the end 3a of the FPC 3 passes through the opening 11f of the frame 11 and the opening 1f formed on one side surface of the bezel 1 from the inside of the frame 11. Project to the side. Finally, the bezel 1 is covered from the front side of the frame 11, and the locks 11 a of the frame 11 are fitted into the holes 1 a of the bezel 1 as shown in FIG. 2, and the bezel 1 is attached to the front side of the frame 11.

  When the liquid crystal display device 100 assembled as described above is installed in a narrow installation space of an electronic device, a control board 70 for controlling the liquid crystal display device 100 is disposed on the back side of the liquid crystal display device 100 as shown in FIG. . The distance between the liquid crystal display device 100 and the control board 70 is about the height of the connectors 71 and 72 for electrically connecting the FPCs 3 and 10 and the control board 70. Since the FPC 3 protrudes to the side of the frame 11, the end 3 a can be connected to the connector 71 by bending it 180 °. Since the FPC 10 protrudes toward the back side of the frame 11, the end 10 a can be connected to the connector 72 by bending 90 ° and pulling around.

  As described above, in a state where the FPC 10 on which the LED 9 is mounted is oriented vertically, the straight portion 10d of the FPC 10 is fitted into the groove 11b provided near one edge in the frame of the frame 11, and the LED 9 is fitted into the recess 11c. By passing the end portion 10a and the straight portion 10c of the FPC 10 through the hole 11e, the straight portion 10d of the FPC 10 is held in the groove 11b, the light emitting surface 9a of the LED 9 faces the end surface 8a of the light guide plate 8, and the FPC 10 The end portion 10a and the straight portion 10c protrude toward the back side of the frame 11. Therefore, even if the FPC 10 is not fixed to the light guide plate 8 or the frame 11 with a double-sided tape or the like, the light emitted from the LED 9 is reliably incident on the end surface 8a of the light guide plate 8 by being held in the groove 11b of the frame 11. Can be made. Further, even if the FPC 10 and the LED 9 are not accurately positioned, the light emitting surface 9a of each LED 9 can be brought close to the end surface 8a of the light guide plate 8 in close proximity or in parallel at the same distance. Further, even if the straight portion 10c of the FPC 10 is not bent and routed at a large angle of about 180 ° or greater than 180 °, the end portion 10a of the FPC 10 can be bent and routed at a small angle of about 90 ° or less than 90 °. Can be connected to a connector 72 disposed on the back side of the frame 11. Therefore, the FPC 10 on which the LED 9 is mounted can be easily arranged in the frame 11, and the disconnection of the FPC 10 can be prevented.

  Further, since the FPC 10 is generally thin, it is very difficult to form the groove 11b in the frame 11 with a very small width substantially equal to the thickness of the FPC 10 so as to hold the FPC 10 without rattling. However, as described above, the groove 11b having a width larger than the thickness of the FPC 10 can be easily formed on the frame 11 by providing the straight member 10d of the FPC 10 in close contact with the side surface of the groove 11b. The gap between the groove 11b and the straight portion 10d of the FPC 10 is filled with the close contact member 12, and the straight portion 10d of the FPC 10 can be reliably prevented from rattling in the groove 11b, and the light emitted from the LED 9 can be stabilized. The light can be incident on the end surface 8 a of the light guide plate 8.

  Further, by making the width of the concave portion 11c perpendicular to the groove 11b of the frame 11 equal to or less than the distance from the straight portion 10d of the FPC 10 to the light emitting surface 9a of the LED 9, the light emitting surface 9a of the LED 9 is guided to the concave portion 11c. The side surface 11d on the side of the light plate 8 can be flush with or protrude from the side surface 11d, and the light emission surface 9a can be brought into close contact with the end surface 8a of the light guide plate 8 to improve the light utilization efficiency of the LED 9.

  The present invention can adopt various forms other than the embodiment described above. For example, in the above embodiment, the example in which the close contact member 12 is provided in the gap between the straight portion 10d of the FPC 10 and the groove 11b of the frame 11 is described, but the present invention is not limited to this, and other than this. For example, the gap between the straight part of the FPC and the groove of the frame may be made minute and the close contact member may be omitted. FIG. 5 is a diagram showing an embodiment in this case. The same or corresponding parts as those in FIG. 4A described above are denoted by the same reference numerals for the sake of convenience. In this embodiment, the thickness of the FPC 20 on which the LED 9 is mounted is formed thicker than the FPC 10 shown in FIG. 4A and the like. Further, a groove 21b to be fitted in a state in which the FPC 20 is vertically oriented is formed with a width approximately equal to the thickness of the FPC 20 along one edge of the inner frame of the frame 21. Such a narrow groove 21b can be formed by, for example, improving the molding accuracy of the frame 21, and becomes easier as the frame 21 becomes smaller. In this way, the gap between the FPC 20 and the groove 21b becomes very small in a state where the FPC 20 is fitted in the groove 21b, and the FPC hardly gets stuck in the groove without providing a close member in the groove 21b. Light emitted from the LED can be stably incident on one end face of the light guide plate.

  Moreover, although the example which connected the edge part 10a of FPC10 to the horizontal fitting type connector 72 arrange | positioned at the back side of the flame | frame 11 is given in the above embodiment, this invention is not limited to this. The present invention can also be applied to the case where the end portion is connected to a connecting member such as a vertical fitting type or a diagonal fitting type connector or a board by fitting or direct soldering.

  Furthermore, in the above embodiment, an example in which the present invention is applied to a small-sized liquid crystal display device 100 incorporated in a printer, a cellular phone, a digital still camera, or the like is given. However, the present invention is incorporated in other electronic devices. It can also be applied to a liquid crystal display device.

It is a perspective view which shows the decomposition | disassembly state of the liquid crystal display device which concerns on embodiment of this invention. It is a perspective view which shows the assembly state of the liquid crystal display device which concerns on embodiment of this invention. It is a side view which shows the use condition of the liquid crystal display device which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a figure which shows other embodiment. It is a perspective view which shows the decomposition | disassembly state of the conventional liquid crystal display device. It is a perspective view which shows the assembly state of the conventional liquid crystal display device. It is a side view which shows the use condition of the conventional liquid crystal display device. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bezel 2 Liquid crystal cell 4 Lens sheet 5 Lens sheet 6 Diffusion sheet 7 Reflection sheet 8 Light guide plate 8a End surface 9 LED
9a Light emitting surface 10 FPC
10a end portion 10b end portion 10c straight portion 10d straight portion 11 frame 11b groove 11c recess 11e hole 12 close contact member 20 FPC
21 frame 21b groove 72 connector 100 liquid crystal display device

Claims (4)

An FPC on which a reflection sheet, a light guide plate, a diffusion sheet, a lens sheet, a liquid crystal cell, and an LED as a light source are mounted is placed in the frame, the bezel is attached to the front side of the frame, and one end of the FPC is attached to the frame In a liquid crystal display device that is projected from the frame so as to be connected to a connector arranged on the back side of the
Forming the FPC into an L-shape;
The LED is mounted on the other straight part toward the other end of the FPC so as to emit light perpendicular to the FPC on the opposite side of the FPC,
A groove is provided along one edge in the frame of the frame to hold the other straight portion in a state where the FPC is vertically oriented,
A recess is provided on the center side of the frame from the groove so that the LED is fitted to face one end surface of the light guide plate.
On the side opposite to the LED of the other straight portion, a close contact member is provided for bringing the straight portion into close contact with the side surface of the groove on the concave portion side,
The width of the recess perpendicular to the groove is set to be equal to or less than the distance from the other straight portion to the surface emitting the light of the LED,
A liquid crystal characterized in that a hole is provided on the bottom surface of one end portion of the groove so as to penetrate one end portion of the FPC and one straight portion toward the end portion and project to the back side of the frame. Display device. An FPC with an LED as a light source, a light guide plate that makes light emitted from the LED incident from one end surface and diffuses and emits in a planar shape, and reflects, diffuses, and collects light emitted from the light guide plate A liquid crystal display in which an optical sheet to be illuminated and a liquid crystal cell are arranged in the frame of the frame, and are projected from the frame of the frame so that one end of the FPC is connected to a connecting member arranged on the back side of the frame In the device
Forming the FPC into an L-shape;
The LED is mounted on the other straight part toward the other end of the FPC so as to emit light to the opposite side of the FPC,
A groove is provided along one edge in the frame of the frame to hold the other straight portion in a state where the FPC is vertically oriented,
A recess is provided on the center side of the frame from the groove so that the LED is fitted to face one end surface of the light guide plate.
A liquid crystal characterized in that a hole is provided on the bottom surface of one end portion of the groove so as to penetrate one end portion of the FPC and one straight portion toward the end portion and project to the back side of the frame. Display device. The liquid crystal display device according to claim 2,
2. A liquid crystal display device according to claim 1, wherein a contact member is provided on the other straight portion of the FPC so as to bring the straight portion into close contact with a side surface of the groove. The liquid crystal display device according to claim 2 or 3,
The liquid crystal display device, wherein a width of the concave portion perpendicular to the groove is set to be equal to or less than a distance from the other straight portion of the FPC to a surface that emits light of the LED.

Images