JP2009003142A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display in which an LED flexible board to mount an LED can be manufactured in a simple form; at low cost. <P>SOLUTION: A main flexible board 6 has insertion passages 66a, 66b provided in both sides via a feeder terminal 65. An LED flexible board 9 comprises a base film 91, having an LED mounting part 91b provided with an LED land 93 to mount an LED 8 and a connecting part 91a, provided with a terminal 92 to connect an LED feeder circuit 94 to the feeder terminal 65. The LED land 93, the terminal 92 and the LED feeder circuit 94 connecting both are laid on one surface of the base film 91, the connecting part 91a is inserted from the top face to the back of the insertion passage 66a, is further inserted from the back face to the top face of the insertion passage 66b, and is folded toward the feeder terminal 65 and electrically connect the terminal 92 to the feeder terminal 65. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and in particular, allows a flexible substrate for LED mounting an LED (light emitting diode) used as a light source for a backlight of a liquid crystal panel to be manufactured simply and inexpensively. .

  For example, in a liquid crystal display device whose demand is increasing as a display device of an electronic device such as a printer, a camera, or a mobile phone, the liquid crystal panel and a drive control unit are mounted to drive and control the liquid crystal panel. It is necessary to connect to the drive control circuit board. In addition, a light guide plate is disposed on the back surface of the liquid crystal panel, and the light of the LED is emitted toward the liquid crystal panel through the light guide plate. Therefore, a power supply circuit for supplying power to the LED is necessary.

  In such a liquid crystal display device, for example, as shown in FIGS. 11 to 13, a liquid crystal panel 105 and a drive control circuit board (not shown) are connected via a main flexible board 106 having a signal transmission circuit and a power feeding circuit. ing. Further, for the LED 108 that emits light toward the liquid crystal panel 105 through the light guide plate 107, a T-shaped LED flexible substrate 109 on which the LED 108 is mounted is connected to a power feeding circuit 106 a formed on the main flexible substrate 106. It was connected to supply power.

  However, in such a configuration, the LED flexible substrate 109 connects the LED land 109a for mounting the LED 108 on one surface thereof to the power supply circuit 106a formed on the main flexible substrate 106 on the other surface. Therefore, it is necessary to form the terminal part 109b for each. That is, the LED flexible substrate 109 needs to be manufactured as a so-called two-layer flexible substrate in which a pattern or the like is formed on both sides of the base film. As a result, the manufacturing process of the LED flexible substrate 109 becomes complicated, and there is a problem that it becomes momentary and expensive.

  Conventionally, for example, there is an LED and a semiconductor device arranged on the first surface of a flexible substrate and an electrode connected to the first terminal of the liquid crystal panel formed on the second surface (for example, Patent Document 1).

In addition, there is a main flexible substrate, a sub flexible substrate, and a connection made through a conductive line provided on a display panel (for example, see Patent Document 2). Furthermore, a flexible board that connects the liquid crystal panel and the control circuit board is formed into a plurality of crotch-shaped branches, and LEDs are mounted on the branched flexible board (for example, Patent Documents). 3).
JP 2004-133108 A JP 2006-330731 A JP 2004-258060 A

  However, in the configuration of the above-mentioned Patent Document 1, as in the configuration shown in FIGS. 11 to 13 described above, the flexible substrate has LEDs and semiconductor devices on the first and second surfaces of the base film, that is, both surfaces. It is necessary to manufacture a so-called two-layer flexible substrate in which patterns such as lands and terminals for mounting are formed. As a result, there has been a problem that the manufacturing process of the flexible substrate becomes complicated, and the momentum becomes expensive.

  In addition, in the configuration of Patent Document 2, a conductive line for connecting the main flexible board and the sub flexible board to the display panel is separately required, and the conductive line, the main flexible board, the conductive line, and the sub flexible are provided. There is a problem in that it is necessary to individually crimp and connect the substrates, and the number of connection points increases. Furthermore, in the configuration of Patent Document 3, since the LED is mounted on the flexible substrate that connects the liquid crystal panel and the control circuit substrate, the shape of the base film that configures the flexible substrate becomes complicated. As a result, there is a problem that a lot of parts are wasted in cutting out the raw material from the film sheet, the momentum and the price are increased, and it is not preferable from the viewpoint of resource saving.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a liquid crystal display device that can manufacture a flexible substrate for LED mounting a LED in a simple and inexpensive manner.

  In order to achieve such an object, in the present invention, a liquid crystal panel, a main flexible substrate connected to a panel terminal provided in the liquid crystal panel, a light guide plate disposed on the back of the liquid crystal panel, and the light guide plate An LED that irradiates light toward the liquid crystal panel, and an LED flexible substrate on which the LED is mounted. The LED flexible substrate has an LED power supply circuit for supplying power to the LED. In the liquid crystal display device in which the LED power supply circuit is connected to the power supply circuit provided on the main flexible substrate, the main flexible substrate is connected to the power supply terminal portion connected to the power supply circuit and the power supply terminal portion. The LED mounting portion further includes insertion passages provided on both sides, and the LED flexible substrate is provided with an LED land on which the LED is mounted. The base film includes a base film having a connection portion provided with a terminal portion for connecting the LED power supply circuit to the power supply terminal portion. The LED land, the terminal portion, and the LED power supply circuit for connecting the LED land to one side of the base film The connecting portion is located on the back side of the insertion path located on the light guide plate side of the insertion path from the surface where the power supply terminal portion of the main flexible board is provided (hereinafter this surface is referred to as the front surface). Furthermore, it is inserted from the back side to the front side into the insertion path located on the side far from the light guide plate in the insertion path, and is folded back to the power supply terminal part side, and the terminal part is electrically connected to the power supply terminal part. Connect.

  According to this configuration, the insertion passage for inserting the connection portion of the LED flexible substrate is formed on both sides of the power supply terminal portion formed on the main flexible substrate, and the connection portion of the LED flexible substrate is arranged in the insertion passage. The insertion path located on the light guide plate side of the main flexible board is inserted into the back surface side from the surface on which the power supply terminal portion is provided, and the back surface is inserted into the insertion path located on the far side from the light guide plate in the insertion path. The terminal portion is inserted from the side, folded back to the power supply terminal portion side, and the terminal portion is electrically connected to the power supply terminal portion. Therefore, the LED flexible substrate is connected to the LED power supply circuit, the LED land connected to the LED, and the terminal portion connected to the LED power supply circuit are formed on one side of the base film. It can be produced as a simple flexible substrate having a so-called single layer structure. As a result, the manufacturing process of the LED flexible substrate can be simplified, and these can be combined to make this type of liquid crystal display device inexpensive.

  Moreover, in this invention, an insertion path is formed in a long hole a little wider than the horizontal width of the connection part of the flexible substrate for LED. According to this configuration, since the LED flexible board is formed in a long hole slightly wider than the width of the connection part of the LED flexible board formed on the main flexible board, the connection part of the LED flexible board is inserted from the surface of the main flexible board. In addition, it is easy to perform the work of folding back from the back side to the front side.

  In the present invention, the insertion path is formed by a slit cut from one side end portion of the main flexible substrate to a length substantially equal to the lateral width of the connection portion of the LED flexible substrate. According to this configuration, when the connecting portion of the LED flexible substrate is inserted from the front surface of the main flexible substrate and then folded back from the back surface side to the front surface side, the LED flexible substrate is connected from one side end portion where the slit is formed. Since it can be inserted in a state where the connection portion of the substrate is substantially bent, the insertion operation is easy and convenient.

  Moreover, in this invention, the connection part of the flexible substrate for LED is folded and formed in the electric power feeding terminal part side so that it may make a U-turn in the insertion path part located in the side far from a light-guide plate. According to this configuration, since the folded portion of the connection portion of the flexible substrate for LED is formed to make a U-turn, the thickness of the folded portion can be extremely reduced, which is convenient.

  Furthermore, in the present invention, the connection portion of the LED flexible substrate is formed by being bent a plurality of times in the insertion passage portion located on the side far from the light guide plate and folded back to the power supply terminal portion side. According to this configuration, since the connection portion of the LED flexible substrate is bent a plurality of times in the insertion passage portion located on the side far from the light guide plate, the stress of the base film in the folded portion is alleviated, The damage can be extremely small and convenient.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid crystal display device which can manufacture the flexible substrate for LED which mounts LED simply and cheaply can be obtained.

(First embodiment)
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an external view of a photo direct printer (hereinafter referred to as PD printer) and a digital still camera (hereinafter referred to as DSC) using a liquid crystal display device according to an embodiment of the present invention. 2 is a rear view showing a main part of the liquid crystal display device of the PD printer shown in FIG. 1, FIG. 3 is a side sectional view of the liquid crystal display device shown in FIG. 2, and FIG. 4 is a bent state of the flexible substrate for LED. It is a conceptual diagram to explain. FIG. 5 is a plan view showing an example of the main flexible board. FIG. 6 is a plan view showing an example of an LED flexible substrate. FIG. 7 is a conceptual diagram illustrating another example of the bent state of the LED flexible substrate. FIG. 8 is a conceptual diagram illustrating still another example of the bent state of the LED flexible substrate.

  The PD printer 1 shown in FIG. 1 directly receives a digital still image from the DSC 2 and prints it. The PD printer 1 and the DSC 2 are connected via a USB (Universal Serial Bus) cable 3 to constitute a direct print system. In this direct print system, direct printing from the DSC 2 to the PD printer 1 is realized using PictBridge (a communication standard for printing by directly connecting a digital camera and a printer). The PD printer 1 displays a paper feed tray 11 on which sheets for photo printing are placed, a discharge tray 12 on which printed sheets are stacked, print layout information, various messages, and the like. A liquid crystal display device 4 and an operation panel 13 (instruction input means) for performing various operations are provided. Further, a liquid crystal display device 40 as a liquid crystal monitor and an operation unit 21 for performing various operations are arranged on the back side of the DSC 2, and a shutter 22 is provided at the upper end of the DSC 2. . The liquid crystal display device 40 is an object to be printed at the time when an image of light incident on a CCD (not shown), a digital still image that has been taken, or divided printing (printing a plurality of divided images on one sheet). A selection screen 23 for selecting an image is displayed. As shown in the figure, the selection screen 23 is a screen that displays a list of a plurality of captured images 24 in thumbnail size.

  With this configuration, for example, when the user inputs an instruction to perform division printing with the layout for printing six divided images on one sheet from the DSC 2 side, the user does not show a micro (not shown) on the DSC 2 side. The processor displays a selection screen 23 including a plurality of captured images 24 on the liquid crystal display device 40. In this state, the user uses the operation unit 21 to select an image for divided printing (hereinafter referred to as a divided image) from the captured images 24 displayed on the selection screen 23, and these divided images 24. The microprocessor transmits a print signal for performing 6-division printing to the PD printer 1 via the USB cable 3.

  When the microprocessor (not shown) on the PD printer 1 side receives the print signal from the DSC 2, it decodes the received command using the decoder on the PD printer 1 side. Then, the DSC 2 is notified that the PD printer 1 has entered the printing state. Next, the microprocessor on the PD printer 1 side creates print layout information arranged in the order received from the DSC 2 and displays the created print layout information on the liquid crystal display device 4 to notify the user. Then, the user uses the operation panel 13 to input an instruction to perform printing using the print layout information displayed on the liquid crystal display device 4 as it is (hereinafter referred to as a determination instruction input). When an instruction for changing the order and / or orientation of the print layout information displayed on the liquid crystal display device 4 at that time is input, the microprocessor on the PD printer 1 side responds to the content of the instruction input. Process. Then, the microprocessor starts split printing output processing based on the print layout information changed or confirmed in the processing, starts printing, discharges printed paper to the discharge tray 12, and finishes printing. As a result, the user can easily print the desired captured image 24.

  Thus, according to the present invention, for example, the liquid crystal display device 4 of the PD printer 1 includes a liquid crystal panel 5 for displaying print layout information and various messages, as shown in FIGS. The main flexible board 6 connected to the panel terminal portion 51 provided on one side of the surface of the panel 5 (the lower side in FIG. 3), the light guide plate 7 disposed on the back surface of the liquid crystal panel 5, and the light guide plate 41 An LED 8 that emits light toward the liquid crystal panel 5 via the LED, a flexible substrate 9 for LED on which the LED 6 is mounted, and a diffusion sheet (not shown), a reflection sheet, and the like as necessary.

  For example, as shown in FIG. 5, the main flexible board 6 includes a flexible base film 61 formed in a square shape. For example, one end of one side of the base film 61 has a panel-side connecting portion. 62, and a substrate-side connecting portion 63 is formed at the other end. In addition, a power supply terminal portion 65 is formed at the other end of the power supply circuit 64 whose one end is connected to the substrate side connection portion 63. On both sides of the power supply terminal portion 65, as will be described later, insertion passages 66a and 66b for inserting the connection portion 91a of the LED flexible substrate 9 are provided. The insertion passages 66a and 66b are formed by long holes that are slightly wider than the lateral width h of the connecting portion 91a, for example. The panel-side connecting portion 62 of the main flexible substrate 6 is mounted on the panel terminal portion 51 of the liquid crystal panel 5, and the substrate-side connecting portion 63 is driven by a drive control unit that drives and controls the liquid crystal panel 5 (not shown). Each is connected to a connector on the circuit board. If the insertion paths 66a and 66b are formed at the same time, for example, when the base film 61 is cut out from the raw film sheet, there is no need to separately form the insertion paths 66a and 66b. Can be convenient.

  In addition, as shown in FIG. 6, the LED flexible substrate 9 includes, for example, a T-shaped top portion on one side of a flexible base film 91 formed in a T shape, and a LED mounting portion 61 b. As shown, LED lands 93 for mounting the LEDs 8 are formed. In addition, a terminal portion 92 connected to the power feeding terminal portion 65 is formed by using a portion serving as a T-shaped leg portion on the same surface as a connection portion 91a. The LED land 93 and the terminal portion 92 are connected by an LED power supply circuit 94 formed on the same surface. The LED flexible substrate 7 is disposed on the back side of the liquid crystal panel 5 and on the same side as the panel terminal portion 51.

  Then, in order to connect the LED power supply circuit 92 to the power supply circuit 62 provided on the main flexible substrate 6, as shown in FIGS. 2 to 4, a connection in which the terminal portion 92 of the LED flexible substrate 9 is formed. The portion 91a is inserted into the insertion passage 66a located on the light guide plate 7 side of the insertion passages 66a and 66b from the surface on which the power supply terminal portion 65 of the main flexible board 6 is provided to the back side, and further the insertion passage 66a. , 66b, the insertion passage 66b located on the side far from the light guide plate 7 is inserted from the back side to the front side, and the insertion passage 66b is folded back to the feeding terminal portion 65 side so as to make a U-turn. Thereafter, the power supply terminal portion 65 and the terminal portion 92 are electrically connected by crimping. As a result, the LED 8 receives predetermined power via the power supply circuit 64 formed on the main flexible substrate 6, the power supply terminal portion 65, the terminal portion 92 of the LED flexible substrate 9, the LED power supply circuit 94, and the LED land 93. It is supplied with power and emits light, and functions as a backlight light source. In the main flexible substrate 6 and the LED flexible substrate 9 shown in each figure, descriptions of a drive control circuit that transmits a signal for controlling the driving of the liquid crystal panel 5 and an insulating layer are omitted.

  Further, as shown in FIG. 7 or FIG. 8, the connection portion 91a may be folded back to the power supply terminal portion 65 side by two or three diffractions, that is, by bending a plurality of times. . As described above, when the connecting portion 91a of the LED flexible substrate 9 is bent and bent a plurality of times in the insertion passage 66b portion located on the side far from the light guide plate 7, the stress of the base film 91 in the folded portion is relieved. The damage in the part can be extremely reduced, which is convenient.

  According to the present embodiment having the above configuration, the insertion path for inserting the connection portion 91a of the LED flexible substrate 9 is formed on both sides of the power supply terminal portion 65 formed on the main flexible substrate 6, and the LED flexible substrate. 9 is inserted into the insertion passage 66a located on the light guide plate 7 side of the insertion passages 66a and 66b from the surface where the power supply terminal portion 65 of the main flexible board 6 is provided to the back side, Of the insertion paths 66a and 66b, the insertion path 66b located on the side far from the light guide plate 7 is inserted from the back surface side to the front surface side, folded back to the power supply terminal section 65 side, and connected to the power supply terminal section 65 to the terminal section 92. Are electrically connected. Therefore, the LED flexible substrate 9 is connected to the LED power supply circuit 94, the LED land 93 connected to the LED power supply circuit 94, and the terminal portion 92 connected to the LED power supply circuit 94. Is formed only on one side of the base film 91 and can be manufactured as a simple flexible substrate having a so-called single-layer structure. As a result, the manufacturing process of the LED flexible substrate 9 can be simplified, and together, these kinds of liquid crystal display devices 4 can be made inexpensive.

  In addition, according to the present embodiment, the insertion paths 66a and 66b formed in the main flexible board 6 are formed in long holes slightly wider than the lateral width of the connection part 91a of the LED flexible board 9, and therefore the connection part 91a. Is inserted into the insertion passage 66a from the front surface of the main flexible substrate 6, and further inserted through the insertion passage 66b from the back surface side and folded back to the front surface side.

  Furthermore, according to the present embodiment, since the folded portion of the connection portion 91a of the LED flexible substrate 9 is formed to make a U-turn, the thickness of the folded portion can be extremely reduced, which is convenient.

(Second Embodiment)
Next, another embodiment of the present invention will be described with reference to FIG. FIG. 9 is a plan view showing another example of a main flexible board according to another embodiment of the present invention. Note that, in FIG. 9, portions denoted by the same reference numerals as those in FIGS. 1 to 8 described above indicate substantially the same components, and thus detailed description thereof is omitted here. Hereinafter, the difference from the above-described first embodiment will be mainly described.

  In this embodiment, as shown in FIG. 9, the main flexible substrate 6 is substantially the same as the lateral width h (see FIG. 6) of the connecting portion 91 a of the LED flexible substrate 9 from one side end (upper side in the illustrated example). Insertion passages 66a and 66b made of slits cut into the same length are formed. Then, the connecting portion 91a of the LED flexible substrate 9 is previously bent into a state as shown in FIG. 4, FIG. 7 or FIG. 8, and in this substantially bent state, the insertion paths 66a and 66b made of slits are provided. It penetrates from the formed upper side end. Thereafter, similarly to the above-described embodiment, the power feeding terminal portion 65 and the terminal portion 92 are connected by crimping and electrically connected. As in the above-described embodiment, the connecting portion 91a may be inserted through the insertion path 66a from the surface of the main flexible board 6, and further inserted through the insertion path 66b from the back surface side and folded back to the surface side. Of course.

  According to this embodiment having the above configuration, the same effects as those of the first embodiment described above can be obtained, and the connection portion 91a of the LED flexible substrate 9 is inserted from the front surface of the main flexible substrate 6, and further from the back surface side. When turning back to the front surface side, the connection portion 91a of the LED flexible substrate 9 can be inserted in a substantially folded state from one side end portion where the insertion paths 66a and 66b made of slits are formed. Work is easy and convenient.

(Third embodiment)
Next, still another embodiment of the present invention will be described with reference to FIG. FIG. 10 is a plan view showing a state of the main flexible board and the connection part of the LED flexible board according to still another embodiment of the present invention. Note that, in FIG. 10, portions denoted by the same reference numerals as those in FIGS. 1 to 9 described above indicate substantially the same parts, and thus detailed description thereof is omitted here. Hereinafter, the difference from the above-described first embodiment will be mainly described.

  In this embodiment, as shown in FIG. 10, the main flexible board 6 has a length L slightly shorter than the lateral width h of the connecting portion 91a of the LED flexible board 9 from one side end (upper side in the illustrated example). Insertion passages 66a and 66b made of cut linear slits are formed. And like the above-mentioned 2nd Embodiment, the connection part 91a of the flexible substrate 9 for LED is bent in the state as shown in FIG.4, FIG.7 or FIG.8 beforehand, for example, in this substantially bent state From the upper side end portion where the insertion passages 66a and 66b made of linear slits are formed, they are inserted. Thereafter, similarly to the above-described embodiment, the power feeding terminal portion 65 and the terminal portion 92 are connected by crimping and electrically connected. As in the above-described embodiment, the connecting portion 91a may be inserted through the insertion path 66a from the surface of the main flexible board 6, and further inserted through the insertion path 66b from the back surface side and folded back to the surface side. Of course.

  According to the present embodiment having the above configuration, the same effects as the first and second embodiments described above can be obtained, and the insertion paths 66a and 66b formed in the main flexible board 6 can be made to the minimum necessary size. It is possible and convenient.

  Each embodiment described above is a preferred example of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  For example, in the above-described embodiment, the case where the liquid crystal display device 4 is applied to a display device that displays print layout information and various messages of the PD printer 1 has been described in detail. For example, the liquid crystal display device 4 is incident on the CCD of the DSC 2 described above. The present invention may be applied to the liquid crystal display device 40 as a liquid crystal monitor that monitors an image of light, a captured digital still image, a selection screen for selecting an image to be printed at the time of divided printing, and the like. Of course. Furthermore, it is needless to say that the present invention may be applied as a display device for other electronic devices.

1 is an external view of a PD printer and DSC using a liquid crystal display device according to an embodiment of the present invention. It is a rear view which shows the principal part of the liquid crystal display device of PD printer shown in FIG. It is side surface sectional drawing of the liquid crystal display device shown in FIG. It is a conceptual diagram explaining the bending state of the flexible substrate for LED. It is a top view which shows an example of a main flexible substrate. It is a top view which shows an example of the flexible substrate for LED. It is a conceptual diagram explaining the other example of the bending state of the flexible substrate for LED. It is a conceptual diagram explaining the further another example of the bending state of the flexible substrate for LED. It is a top view which shows the other example of the main flexible substrate which concerns on other embodiment of this invention. It is a top view which shows the state of the connection part of the main flexible substrate which concerns on further another embodiment of this invention, and the flexible substrate for LED. It is a rear view which shows the principal part of the conventional liquid crystal display device. It is principal part sectional drawing of FIG. It is a conceptual diagram for demonstrating the conventional flexible substrate for LED.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Liquid crystal display device 40 Liquid crystal display device 5 Liquid crystal panel 51 Panel terminal part 6 Main flexible board 61 Base film 62 Panel side connection part 63 Substrate side connection part 64 Feed circuit 65 Feed terminal part 66a Insertion path 66b Insertion path 7 Light guide plate 8 LED
DESCRIPTION OF SYMBOLS 9 Flexible substrate for LED 91 Base film 91a Connection part 91b LED mounting part 92 Terminal part 93 Land for LED 94 Power supply circuit for LED

Claims (5)

A liquid crystal panel, a main flexible board connected to a panel terminal provided in the liquid crystal panel, a light guide plate disposed on the back surface of the liquid crystal panel, and light directed toward the liquid crystal panel via the light guide plate An LED to be irradiated and an LED flexible substrate on which the LED is mounted, the LED flexible substrate having an LED power supply circuit for supplying power to the LED, and the LED power supply circuit In the liquid crystal display device that is connected to a power supply circuit provided on the main flexible substrate,
The main flexible substrate further includes a power supply terminal portion connected to the power supply circuit, and insertion paths provided on both sides via the power supply terminal portion, and the LED flexible substrate is an LED on which the LED is mounted. An LED mounting portion provided with a land for use, and a base film having a connection portion provided with a terminal portion for connecting the LED power supply circuit to the power supply terminal portion, and the LED land on one side of the base film, The terminal portion and the LED power supply circuit for connecting the terminal portion and the power supply circuit for the LED are disposed, and the connection portion is provided in the insertion passage located on the light guide plate side of the insertion passage. The insertion portion is inserted from the front surface provided with the terminal portion to the back surface side, and further to the insertion passage located on the far side from the light guide plate in the insertion passage, from the back surface side to the front surface side. While being inserted, folded to the feeding terminal portion, the power supply terminal portions, the liquid crystal display device which is characterized in that electrically connecting the terminal portions.   The liquid crystal display device according to claim 1, wherein the insertion path is a long hole that is slightly wider than a lateral width of the connection portion of the LED flexible substrate.   The said insertion path is a slit cut into the length substantially the same as the horizontal width of the connection part of the said flexible substrate for LED from the one side edge part of the said main flexible substrate. Liquid crystal display device.   The connection portion of the LED flexible substrate is folded back toward the power supply terminal portion so as to make a U-turn in an insertion passage portion located on the side far from the light guide plate. 4. The liquid crystal display device according to any one of 3.   The connection portion of the LED flexible substrate is bent a plurality of times at an insertion path portion located on the side far from the light guide plate, and is turned back to the power supply terminal portion side. Item 4. The liquid crystal display device according to any one of Items 3 to 4.