JP2006276265A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure strength of a four-circumference frame, in which a display panel is incorporated by making the four-circumference frame not have notch portions formed in both sidewalls, as much as possible. <P>SOLUTION: A liquid crystal display device has display panels P1 and P2 on a top-surface side and a reverse-surface side and includes one rectangular four-circumference frame 6, where both the display panels P1 and P2 are incorporated, a panel-driving substrate F1 which drives those display panels P1 and P2, and a light-source driving substrate F2 on which light sources of the display panels are mounted, and a 1st downward folded portion 8B, which is folded toward the lower side of the four-circumference frame 6, is formed on the light-source driving substrate F2 and arranged on the reverse-surface side from the top-surface side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device having a display panel on each of a front surface side and a back surface side, and a single rectangular quadrilateral frame in which both display panels are incorporated.

  In recent years, information devices such as a mobile phone and a mobile personal computer have a form having a main display panel on the front surface and a sub display panel on the back surface (patents). Reference 1).

  FIG. 5 shows an example of the liquid crystal display device 31, which includes a main display panel P 1 that performs display on the front surface side and a sub display panel P 2 that performs display on the back surface side. The liquid crystal display device 31 is attached to the lower side of the main display panel P1 and a synthetic resin quadrilateral frame 36 in which the display panels P1 and P2 are incorporated together with the light guide plates 34 and 35. A panel driving substrate F1 for driving the panels P1 and P2 and a band-shaped light source driving substrate F2 on which each light source 38L for irradiating light from below the light guide plates 34 and 35 is mounted.

  Cutout portions 39a and 39b are provided on both side walls 36d and 36e of the four-circumferential frame 36, respectively. First, one notch 39 a is provided for adapter connection between the light source driving substrate F 2 and the panel driving substrate F 1 on the back side of the liquid crystal display device 31. The panel driving substrate F1 is folded back from the front surface side of the liquid crystal display device 31 along the lower end of the four-frame frame 36, is disposed on the back surface side of the liquid crystal display device 31, and is connected to the sub display panel P2. At this time, the panel driving substrate F1 is connected to the sub display panel P2 while covering the light source driving substrate F2. On the other hand, an electronic component such as an IC that gives a command to the light source driving substrate F2 is mounted on the panel driving substrate F1, and therefore, in order to make the light source driving substrate F2 function, the light source driving substrate F2 and the panel driving device are used. It is necessary to connect the board F1 with a connector. A connection connector S3 is provided at the end 38d of the bent portion 38a of the light source driving substrate F2, and the back surface is folded back along the one side wall 36d of the quadrilateral frame 36 from the front surface side covered with the panel driving substrate F1. On the side, it is connected to the connection connector S4 of the panel drive board F1.

The other notch 39b is provided to place the light source 38L below the light guide plates 34 and 35. Since the light source 38L is mounted on the light source driving substrate F2, the light source driving substrate F2 is disposed on the liquid crystal display device in order to dispose the light source 38L below the light guiding plates 34, 35. It is necessary to fold along the other side wall 36e of the four-frame frame 36 from the front surface side of 31 and wind up to the back surface side of the liquid crystal display device 31.
JP 2004-187154 A

  By the way, the both side walls 36d, 36e side of the four-frame frame 36 is a place where there is a limit to widen the width in order to ensure a wide screen size, and it is a place where thinness is required. The lower side of the quadrilateral frame 36 is a portion that does not affect the screen size as compared with the side walls 36d and 36e side. However, if notches 39a and 39b for folding the light source driving substrate F2 are provided on both side walls 36d and 36e of the four-circumferential frame 36 constituting the liquid crystal display device 31, the strength of these portions is reduced. It will be. For this reason, when an unexpected external force (bending force) is applied to the side walls 36d and 36e, the side walls 36d and 36e of the quadrilateral frame 36 may be damaged.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device that ensures the strength of a quadrilateral frame by providing as few cutouts as possible on both side walls of the quadruple frame in which a display panel is incorporated.

  The liquid crystal display device according to claim 1 of the present invention has a display panel on each of the front surface side and the back surface side, one rectangular quadrilateral frame in which these both display panels are incorporated, and a panel for driving these display panels. In a liquid crystal display device comprising a driving substrate and a light source driving substrate on which a light source of each display panel is mounted, and the panel driving substrate is folded and arranged below a rectangular quadrilateral frame, the light source driving substrate The substrate is characterized in that a first lower-side bent portion that is folded back toward the lower side of the quadrilateral frame is formed on the substrate so as to be arranged from the front surface side to the back surface side.

  In the conventional liquid crystal display device, not only a notch portion for folding the bent portion of the light source driving substrate is provided on one side wall of the four-round frame, but also the bent portion of the light source driving substrate is folded on the other side wall of the four-round frame. Therefore, when external addition was added to the both side walls, sufficient strength (rigidity) could not be exhibited. However, according to the present invention, the light source driving substrate is formed with the first lower bent portion that is folded back toward the lower side of the quadrilateral frame so as to be arranged from the front side to the back side. Therefore, even if external addition is added to both side walls, sufficient strength can be exhibited.

  According to a second aspect of the present invention, on the premise of the first aspect of the present invention, a first lower side for folding and fixing the first lower bent portion to the lower side of the quadrilateral frame. A notch is formed.

  According to the present invention, the first lower notch for folding and fixing the first lower bent portion is formed on the lower side of the four-frame frame. Is a portion that does not affect the screen size as compared with the side walls 36d, 36e side, so that the first lower side notch can be sufficiently secured, and the first lower side bent portion can be secured. It becomes a fixed part when turning back.

  According to a third aspect of the present invention, on the premise of the first aspect, the liquid crystal display device is provided with a second lower bent portion connected to the light source driving substrate on the back surface side with the panel driving substrate. And is arranged from the front surface side to the back surface side.

  In the conventional liquid crystal display device, not only a notch portion for folding the bent portion of the light source driving substrate is provided on one side wall of the four-round frame, but also the bent portion of the light source driving substrate is folded on the other side wall of the four-round frame. Therefore, even if external addition was added to the both side walls, sufficient strength could not be exhibited. However, according to the present invention, the light source driving substrate is provided with a second downward bent portion connected to the panel driving substrate on the back surface side, and is arranged from the front surface side to the back surface side. Therefore, even if external addition is added to both side walls, sufficient strength can be exhibited.

  According to a fourth aspect of the present invention, in the liquid crystal display device according to the fourth aspect of the present invention, a second lower side notch for folding and fixing the second lower bent portion is formed on the lower side of the quadrilateral frame. Features.

  According to this invention, the second lower side notch for folding back and fixing the second lower bent portion is formed on the lower side of the quadrilateral frame. Since it is a portion that does not affect the screen size as compared with the both side walls, the second lower side notch can be sufficiently secured and fixed when the second lower side bent portion is folded back. It becomes a place to do.

  According to the liquid crystal display device of the present invention, the first and second lower bent portions are formed on the light source driving substrate so as to be arranged from the front surface side to the back surface side. Even if an external force is applied, it is difficult for a situation in which the four-frame frame is damaged, and it becomes possible to protect the display panel and the light guide plate of the liquid crystal display device and to extend the life.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1st Embodiment of this invention is the liquid crystal display device 1 used for information equipment, such as a mobile telephone and a mobile personal computer, especially the information equipment which has a liquid crystal display part on the surface side and back side, A main display panel P1 for performing display, a sub display panel P2 for performing display on the back surface side, a quadruple frame 6 in which these display panels P1 and P2 are incorporated together with the light guide plates 4 and 5, and a main display A panel driving substrate F1 that is attached to the lower end of the panel P1 and drives the display panels P1 and P2, and each light source 8L that irradiates light toward the light guide plates 4 and 5 from below the light guide plates 4 and 5. Each light source 8L is mounted and has a substantially U-shaped light source driving substrate F2 for driving each light source 8L (FIG. 1).

  FIG. 1 is an exploded perspective view showing the structure of the liquid crystal display device 1. The main display panel P1 that performs display on the front side is such that the optical sheet 11a, the array substrate 12a, the liquid crystal (not shown), the counter substrate 14a, the optical sheet 15a, and the like are sequentially stacked from the side close to the light guide plate 4. Composed. The optical sheets 11a and 15a are for optically changing and adjusting the light incident from the light guide plate 4 side or the light incident from the counter substrate 14a. The array substrate 12a is a substrate in which thin film transistors (TFTs), transparent pixel electrodes (ITO) and the like (not shown) are formed in a matrix on the surface side of a glass substrate which is an insulating substrate. The counter substrate 14a is a substrate in which a counter electrode (not shown) or the like is formed on the back side of a glass substrate that is an insulating substrate. Note that liquid crystal is disposed between the array substrate 12a and the counter substrate 14a.

  A panel drive substrate F1 is integrally attached to the lower end of the main display panel P1, that is, below the surface side of the array substrate 12a. The panel driving substrate F1 is responsible not only for driving the main display panel P1, but also for driving the sub display panel P2. The panel driving substrate F1 is also mounted with an electronic component such as an IC that gives a command to the light source driving substrate F2 described below. On the other hand, the sub display panel P2 has the same configuration as the main display panel P1. That is, the optical sheet 11b, the array substrate 12b, the liquid crystal (not shown), the counter substrate 14b, the optical sheet 15b, and the like are sequentially stacked from the side close to the light guide plate 5. The characteristics of the constituent members are the same as those of the constituent members of the main display panel P1.

  Each display panel P <b> 1, P <b> 2 is incorporated in one quadruple frame 6. The quadrilateral frame 6 is formed in a substantially rectangular shape (FIGS. 1 and 2). FIG. 2 is a diagram showing the configuration of the quadrilateral frame 6, and FIG. 2A is a front view showing the configuration of the front side of the quadruple frame 6. The light guide plate 4 for supplying the light of the light source 8L to the main display panel P1 is housed on the front surface side of the four-frame frame 6, and the outer wall for incorporating the main display panel P1 on the peripheral edge on the front surface side, that is, the top A wall 6c, one side wall 6d, another side wall 6e, and a lower wall 6f are integrally formed. One side wall 6d of the outer wall is provided with a notch 9a for folding the side-side bent portion 8a of the light source driving substrate F2 from the front surface side to the back surface side. On the other hand, the lower wall 6f of the outer wall is provided with a notch 10 for folding the panel driving substrate F1 from the front surface side to the back surface side. Further, in the cutout portion 10 of the quadrilateral frame 6, a first lower bent portion (consisting of a vertical portion 8b and a lower side portion 8c) 8B of the light source driving substrate F2 is further formed from the front surface side to the back surface side. A first lower side notch portion 9b is provided for folding back. The first lower cutout portion 9b is formed with a width equal to or greater than the width of the vertical portion 8b of the light source driving substrate F2.

  FIG. 2B is a rear view showing the configuration of the back surface side of the four-circumferential frame 6. A light guide plate 5 for supplying light from the light source 8L to the sub display panel P2 is housed on the back side of the four-frame frame 6, and an outer wall for incorporating the sub display panel P2 on the back side, that is, Both side walls 6g, 6g are integrally formed on the back side of the four-frame 6 in accordance with the size of the sub display panel P2. Here, the light source 8L uses a light emitting diode.

  The light source driving substrate F2 is configured by mounting a plurality of light sources 8L and wirings for driving the light sources 8L on the back side of a substantially U-shaped flexible substrate as shown in FIG. The A plurality of light sources 8L that allow light to enter the light guide plate 4 are mounted on the back side of the upper side 8a in the U-shape, and light is applied to the light guide plate 5 on the back side of the lower side 8c. A plurality of incident light sources 8L are mounted. A connection adapter S1 for adapter connection with the panel driving substrate F1 is provided at an end 8d of the upper side 8a of the U-shape. Here, the upper side 8a of the U-shape is a side bent portion, and the combination of the vertical portion 8b and the lower side 8c of the U-shape is a first lower bent portion 8B. .

  Next, in assembling the liquid crystal display device 1 according to the present embodiment, first, the light guide plates 4 and 5 are housed on the front surface side and the back surface side of the quadrilateral frame 6. Next, the side-side bent portion (upper side portion 8a) of the light source driving substrate F2 is overlaid below the light guide plate 4 housed on the front surface side of the quadrilateral frame 6. At this time, each light source 8L of the light source driving substrate F2 is inserted into the plurality of light source cutout portions 4K provided at the lower end portion of the light guide plate 4. Thereby, the light emitted from each light source 8 </ b> L enters the light guide plate 4 from the light source notch 4 </ b> K of the light guide plate 4. Here, the end portion 8d (S1) of the side-side bent portion (upper side portion 8a) is shaped to protrude outward from the notch portion 9a provided on the one side wall 6d of the four-frame frame 6.

  The first lower bent portion (vertical portion 8b and lower side portion 8c) 8B is folded back and fixed along a first lower cutout portion 9b provided on the lower side of the four-frame 6. At this time, the vertical portion 8b of the first lower bent portion 8B is folded back along the first lower cutout portion 9b, so that the lower side portion 8c is arranged on the back surface side of the four-frame 6. Will be. And the lower side part 8c distribute | arranged to the back surface side is piled up under the light-guide plate 5 accommodated in the back surface side of the quadrilateral frame 6. FIG. At this time, each light source 8L of the light source driving substrate F2 is inserted into the plurality of light source cutout portions 5K provided at the lower end portion of the light guide plate 5 (FIGS. 1 and 2B). Thereby, the light emitted from each light source 8 </ b> L enters the light guide plate 5 from the notch portion 5 </ b> K for the light guide plate 5. Here, the lower side of the quadrilateral frame 6 indicates the notch 10 provided in the lower wall 6f of the quadruple frame.

  Next, the display panels P1 and P2 are assembled in the four-round frame 6 to which the light guide plates 4 and 5 and the light source driving substrate F2 are attached. First, the main display panel P <b> 1 is attached to the front surface side of the quadrilateral frame 6. That is, the main display panel P1 is fitted into the outer walls (upper wall 6c, one side wall 6d, the other side wall 6e, and the lower wall 6f) arranged on the front surface side of the four-frame frame 6. Here, a panel driving substrate F1 is attached to the lower end of the main display panel P1, and this panel driving substrate F1 protrudes to the outside from the notch 10 provided in the lower wall 6f. Appears. Further, the sub display panel P2 is also fitted and attached to the outer walls (both side walls 6g and 6g) disposed on the back side of the quadrilateral frame 6. Accordingly, the display panels P1 and P2 can receive light from the light guide plates 4 and 5, respectively.

  The panel driving substrate F1 is folded back from the front side to the back side along the cutout portion 10 of the quadruple frame 6, and connected to the sub display panel P2 attached to the back side of the quadruple frame 6. . Specifically, the panel drive substrate F1 is provided with a window 7a that matches the shape of the sub display panel P1. When the window 7a is folded back, the sub display panel P2 is passed through the window 7a. . Then, the connection portion 7b provided at the lower end (the lower end when viewed from FIG. 1) of the window 7a is connected to the upper end portion (the upper end when viewed from FIG. 1) of the array substrate 12b of the sub display panel P2. . The panel driving substrate F1 is responsible not only for driving the main display panel P1, but also for driving the sub display panel P2. By this connection, the main display panel P1 and the sub display panel P2 are used for panel driving. The driving is performed in association with the command of the substrate F1.

  Finally, the panel driving substrate F1 and the light source driving substrate F2 are adapter-connected. As described above, the panel driving substrate F1 is attached to the quadrilateral frame 6 so as to cover the light source driving substrate F2. The side-side bent portion (upper side portion 8a) of the light source driving substrate F2 The shape of the frame 6 projects outward from a notch 9 a provided on one side wall 6 d of the frame 6. The side bent portion (upper side portion 8a) is folded back from the front surface side to the back surface side along the notch portion 9a. Then, the connection adapter S1 (male portion S1) provided at the end portion 8d of the side bent portion (upper side portion 8a) and the surface side of the panel driving substrate F1 (as viewed from FIG. 1) are arranged. An adapter is connected to the connection adapter S2 (female part S2). Thus, each light source 8L mounted on the light source driving substrate F2 is driven by a command from the panel driving substrate F1. The liquid crystal display device 1 of the present embodiment is assembled by the above process. Here, the above assembly process is merely an example, and it is arbitrary to assemble the liquid crystal display device 1 in another order. For example, in the manufacturing process in the plant, a method is often used in which the panel drive substrate F1 and the light source drive substrate F2 are connected in advance by adapter connection and incorporated in the four-round frame 6. Thus, the liquid crystal display device 1 may be manufactured.

  Here, the lower frame edge 6b of the four-circumferential frame 6 is a place where the width can be increased as compared with the left and right frame edges 6a, 6a. The left and right side frame edges 6a, 6a of the four-circumferential frame 6 are places where there is a limit to widen the width in order to ensure a wide screen size, and the four-circumferential frame 36 is required to be thin. The lower side (lower frame edge 6b) is a place where a strong frame is required because the light source 8L and the like are arranged, and is a place that does not affect the screen size compared to the side walls 6d and 6d side. Therefore, the first lower side notch 9b can be sufficiently formed, and the screen size and the like are not particularly affected. In the present embodiment, it is not necessary to form a notch in one of the left and right side walls 6d, 6e of the four-frame frame 6, and the rigidity of the four-frame frame 6 is ensured accordingly.

(Second Embodiment)
As shown in FIG. 4, the liquid crystal display device 21 according to the second embodiment of the present invention is provided with a notch 20 for folding the panel driving substrate F1 from the front surface side to the back surface side. In the notch 20, the second lower bent portion (one vertical portion 28s) and the first lower bent portion (the other vertical portion 28b and the lower side portion 28c) 28B of the light source driving substrate F2 are provided on the surface side. Notches 29a and 29b are provided for folding back from the back to the back side. Here, the notch 29b is a first lower notch, and the notch 29a is a second lower notch. These notches 29a and 29b are formed with a width equal to or greater than the width of one vertical portion 28s and the other vertical portion 28b of the light source driving substrate F2.

  The light source driving substrate F2 is configured by mounting a plurality of light sources 8L and wiring for driving the light sources 8L on the back side of the substrate. The shape of the substrate is integrally arranged at a substantially U-shaped portion (upper side portion 28a, the other vertical portion 28b, lower side portion 28c) and an end portion of the upper side portion 28a of the substantially U-shaped portion. One vertical portion 28s, and is configured as the number “6” or “9”. A plurality of light sources 8L that allow light to enter the light guide plate 4 are mounted on the back side of the upper side portion 28a, and a light source 8L that causes light to enter the light guide plate 5 is provided on the back side of the lower side portion 28c. Several are implemented. Further, a connection adapter S1 for adapter connection with the panel driving substrate F1 is provided at the end portion 28d of the one vertical portion 28s. Here, the one vertical portion 28s is defined as a second lower bent portion, and the combination of the other vertical portion 28b and the lower side portion 28c is defined as a first lower bent portion 28B.

  Next, in assembling the liquid crystal display device 21 of the present embodiment, the light guide plates 4 and 5 are first stored on the front surface side and the back surface side of the quadrilateral frame 26, and then below the stored light guide plate 4. The upper side portion 28a of the light source driving substrate F2 is overlapped. At this time, each light source 8L of the light source driving substrate F2 is inserted into the plurality of light source cutout portions 4K provided at the lower end portion of the light guide plate 4. Thereby, the light emitted from each light source 8 </ b> L enters the light guide plate 4 from the light source notch 4 </ b> K of the light guide plate 4. On the other hand, the first lower bent portion (the other vertical portion 28b and lower side portion 28c) 28B of the light source driving substrate F2 is on the lower side of the quadrilateral frame 26, that is, the notch portion 29b provided in the notch portion 20. Wrapped along. At this time, the vertical portion 28b of the first lower bent portion (the other vertical portion 28b and the lower side portion 28c) 28B is folded along the first lower cutout portion 29b. The portion 28c is disposed on the back side of the four-frame 26. And the lower side part 28c distribute | arranged to the back surface side is piled up under the light-guide plate 5 accommodated in the back surface side of the quadrilateral frame 26. FIG. At this time, each light source 8L of the light source driving substrate F2 is inserted into the plurality of light source cutout portions 5K provided at the lower end portion of the light guide plate 5. Thereby, the light emitted from each light source 8 </ b> L enters the light guide plate 5 from the notch portion 5 </ b> K for the light guide plate 5.

  Next, the display panels P1 and P2 are assembled in the four-round frame 26 to which the light guide plates 4 and 5 and the light source driving substrate F2 are attached. First, the main display panel P <b> 1 is attached to the front surface side of the quadrilateral frame 26. That is, the main display panel P1 is fitted into the outer walls (upper wall 26c, one side wall 26d, the other side wall 26e, and the lower wall 26f) arranged on the front surface side of the four-circumferential frame 26. Here, the panel driving substrate F1 is attached to the lower end of the main display panel P1, and this panel driving substrate F1 protrudes outside from the notch portion 20 provided in the lower wall 26f. It looks like. Further, the sub display panel P2 is also fitted and attached to the outer walls (both side walls 26g, 26g) arranged on the back surface side of the quadrilateral frame 26. As a result, the display panels P1 and P2 can be supplied with light from the light guide plates 4 and 5, respectively.

  The panel driving substrate F1 is folded back from the front side to the back side along the cutout portion 20 of the quadrilateral frame 26, and is connected to the sub display panel P2 attached to the back side of the quadruple frame 26. The Specifically, the panel drive substrate F1 is provided with a window 27a that matches the shape of the sub display panel P2. When the window 27a is folded back, the sub display panel P2 is passed through the window 27a. The connecting portion 27b provided at the lower end (the lower end as viewed in FIG. 4) of the window 27a is connected to the upper end portion (the upper end portion as viewed from FIG. 4) of the array substrate 12b of the sub display panel P2. . The panel driving substrate F1 is responsible not only for driving the main display panel P1, but also for driving the sub display panel P2. By this connection, the main display panel P1 and the sub display panel P2 are connected to each other. Driven in association with the F1 command. Here, the second lower side bent portion (one vertical portion 28s) of the light source driving substrate F2 protruding from the cutout portion 20 of the quadrilateral frame 26 is a cut provided on the side edge of the panel driving substrate F1. Since it passes through the notch 27K and is guided to the front surface side of the panel driving substrate F1, the light source driving substrate F1 is not caught even if it is folded back.

  Finally, the panel driving substrate F1 and the light source driving substrate F2 are adapter-connected. As described above, the panel driving substrate F1 is attached to the quadrilateral frame 26 so as to cover the light source driving substrate F2, but the second downward bent portion (one vertical portion 28s) of the light source driving substrate F2. Is passed through a notch 27K provided on the side edge of the panel driving substrate F1, and is led to the surface side of the panel driving substrate F1. The second lower bent portion (one vertical portion 28s) is folded along the surface of the panel driving substrate F1. Then, below the connection adapter S1 provided at the end 28d of the second lower bent portion (one vertical portion 28s) and the cutout portion 27K of the panel driving substrate F1 (as viewed from FIG. 4). An adapter is connected to the connection adapter S2 arranged in the network. As a result, each light source 8L mounted on the light source driving substrate F2 is driven by a command from an electronic component such as an IC mounted on the panel driving substrate F1.

  Here, the above assembly process is merely an example, and it is optional to assemble the liquid crystal display device 21 in another order. For example, in the manufacturing process in the plant, a method is often used in which the panel drive substrate F1 and the light source drive substrate F2 are connected in advance by adapter connection and incorporated in the four-round frame 26. Thus, the liquid crystal display device 21 may be manufactured.

  According to the liquid crystal display device 21 of the present embodiment, the second lower bent portion (one vertical portion 28s) of the light source driving substrate F2 and the first lower bent portion (the other lower portion of the light source driving substrate F2). The notches 29a and 29b for folding the vertical portion 28b and the lower side portion 28c) 28B are provided on the lower side of the four-frame 26 instead of the two walls 26d and 26e of the four-frame 26, so Even if a general addition is added, sufficient strength can be exhibited. Further, in order to correspond to the shape of the four-round frame 26, the shape of the light source driving substrate F2 is changed to a second lower bent portion (one vertical portion 28s) and a first lower bent portion (the other vertical portion 28b). By adopting the shape having the lower side portion 28c), it is not affected by the attachment of the main display panel P1 or the panel driving substrate F1 without providing the notches on the side walls 26d and 26e as in the prior art. The lower side portion 28c of the light source driving substrate F2 can be smoothly arranged on the back surface side of the four-frame 26, and the connection between the light source driving substrate F2 and the panel driving substrate F1 can be performed smoothly.

1 is an exploded perspective view showing a structure of a liquid crystal display device according to a first embodiment of the present invention. It is the figure showing the structure of the four frame which is a structural member of the said 1st Embodiment, FIG.2 (a) is the front view which showed the structure of the surface side of a four frame, FIG.2 (b) These are the rear views which showed the structure of the back surface side of a quadrilateral frame, and FIG.2 (c) is the side view which showed the structure of the side surface side of a quadrilateral frame. It is the front view which showed the light source drive board | substrate which is a structural member of the said 1st Embodiment. It is the disassembled perspective view which showed the structure of the liquid crystal display device which is the 2nd Embodiment of this invention. It is the disassembled perspective view which showed the structure of the conventional liquid crystal display device.

Explanation of symbols

1,21 liquid crystal display device,
P1 main display panel,
P2 sub display panel,
4,5 light guide plate,
6,26 Quadruple frame, 6b Lower frame edge, 6a, 6a Left right frame edge,
F1 Panel drive board,
F2 light source driving substrate,
8B first lower bent portion (vertical portion 8b and lower side portion 8c),
28B first lower bent portion (the other vertical portion 28b and lower side portion 28c),
28s Second lower bent portion (one vertical portion)
9a, 29a second lower notch,
9b, 29b first lower side notch,
10 Notch,
4K, 5K light source notch,
27K substrate notch,

Claims (4)

Each display panel has a display panel on the front side and the back side, and a rectangular quadrilateral frame in which both display panels are incorporated, a panel drive substrate for driving each display panel, and a light source for each display panel are mounted. In the liquid crystal display device, the panel driving substrate is folded and arranged on the lower side of the rectangular quadrilateral frame.
A liquid crystal display device characterized in that a first lower side bent portion is formed on the light source driving substrate so as to be bent toward the lower side of the quadrilateral frame, and is arranged from the front surface side to the back surface side. .   2. The liquid crystal display device according to claim 1, wherein a first lower notch for folding and fixing the first lower bent portion is formed on the lower side of the quadrilateral frame.   2. The light source driving substrate is provided with a second downward bent portion connected to the panel driving substrate on the back surface side, and is arranged from the front surface side to the back surface side. The liquid crystal display device described.   4. The liquid crystal display device according to claim 3, wherein a second lower side notch for folding and fixing the second lower side bent portion is formed on the lower side of the four-circumferential frame.

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