JP5410240B2 - Display module and electronic device - Google Patents

Description

The present invention relates to a display module and an electronic device using the display module, and more specifically, a bending suppressing member is provided at an outlet opening portion of a housing from which a flexible printed wiring board (hereinafter referred to as “FPC board”) is led out. Thus, the present invention relates to a display module in which through holes and the like formed in an FPC board are not easily damaged even when the FPC board is bent, and an electronic apparatus using the display module.

A liquid crystal display device has characteristics of light weight, thinness, and low power consumption as compared with a CRT (cathode ray tube), and thus is used in many electronic devices for display. The liquid crystal display device displays an image by changing the amount of light passing through the liquid crystal layer by changing the direction of liquid crystal molecules aligned in a predetermined direction by an electric field by rubbing the alignment film. is there. The light source incident on the liquid crystal layer includes external light in a reflective liquid crystal display device and a backlight in a transmissive liquid crystal display device. The reflective liquid crystal display device has advantages such as power saving and high visibility under strong external light, and the transmissive liquid crystal display device has advantages in high visibility in a dark environment. Also,
A transflective liquid crystal display device having both properties is also known. Currently, a transmissive or transflective liquid crystal display device is often used as a liquid crystal display device because of its high visibility even in a dark environment.

Thus, a transmissive or transflective liquid crystal display device has a backlight unit on the back surface of the liquid crystal panel. A display module in which the liquid crystal panel and the backlight unit are housed in a casing is mass-produced at a module manufacturing factory, and the display module is incorporated into various electronic devices at the electronic apparatus manufacturing factory. This display module includes the following Patent Document 1.
As shown in FIG. 4, the display control circuit board is also accommodated in the case in which the liquid crystal panel and the backlight unit are accommodated, or as shown in FIG. What is known. In this display module, the extending part of the FPC board is led out from the outlet opening of the housing, and the terminal of the extending part is connected to an electronic device to supply drive power and input display data. As shown in FIG. 1 and FIG. 3 of Patent Document 1 below, the outlet opening of this FPC board is shown in the form provided on the side surface of the housing, and in FIG. 1 and FIG. 2 of Patent Document 2. Thus, there are many forms provided on the bottom surface of the housing.

JP 2008-226965 A JP 2008-009229 A JP 2000-183526 A JP 2008-112663 A

The FPC board led out from the housing of the display module is often bent, for example, bent when connected to an electronic device, or connected in a bent state depending on the installed state in the electronic device. And the FPC board that is usually led out from the casing has the outlet opening of the casing as the starting point of bending. Also, the FPC board usually has a laminated structure through through holes,
As disclosed in Patent Document 3, this bending damages the through-hole of the FPC board, or damages the copper foil wiring portion starting from this through-hole.

Therefore, since the through-hole and the peripheral portion of the through-hole are easily damaged when the FPC board is bent, the through-hole formation area is restricted, and the design time is long. There is a problem that the FPC board has to be lengthened in order to form the through-hole formation region away from the outlet opening of the housing. In addition, there is a problem in that the electrically coupled portion of the mounted component is easily damaged by the bending of the FPC board, and this formation region cannot be formed in the vicinity of the outlet opening of the housing. In addition,
Such problems are not limited to a display module using a liquid crystal display panel, but also to a display module using a flat panel such as an organic EL (electroluminescence) display panel as disclosed in Patent Document 4 above. This is a problem that occurs.

The present invention has been made in view of the above problems, and an object of the present invention is an FPC board derived from a housing of a display module, such as a through-hole formation area and an electrical component mounting area. An object of the present invention is to provide a display module and an electronic device using the display module, in which an area that is easily damaged by bending can be formed in the vicinity of the outlet opening of the FPC board of the housing.

In order to achieve the above object, a display module of the present invention is a display module having a display panel, a flexible printed wiring board, and a housing for housing the display panel and the flexible printed wiring board. The printed wiring board has a lead-out portion led out from an outlet opening provided in the casing, and the casing has a bending suppression member extending from the outlet opening leading out the flexible printed wiring board. It is provided in the position facing a part.

The lead-out portion of the FPC board is often bent when connecting to an electronic device or when incorporating the electronic device. In addition, an electrical joint portion such as a through hole of the FPC board and a portion where the mounting component is disposed are easily damaged by bending. In the display module of the present invention, since the bending suppressing member for restricting the bending of the FPC board is disposed in the outlet opening provided in the housing and the FPC board extends from the outlet opening, the FPC board does not bend. The region or the region that is difficult to bend can be increased. Thus, according to the display module of the present invention, the FP
The design time can be shortened by increasing the degree of freedom in designing the through-holes of the C substrate and the mounting positions of the electrical components, and the FPC substrate can be prevented from becoming large.

In addition, by attaching a separate reinforcing plate at the lead-out portion of the conventional FPC board and preventing the bending at the lead-out portion by this reinforcing plate, a through hole is also formed in the portion where the reinforcing plate is pasted. However, such a configuration has problems such as an increase in thickness at the lead-out portion of the FPC board and an increase in cost of the FPC board due to pasting. However, in the present invention, since the bending suppression member is provided in the casing itself, problems such as an increase in thickness at the lead-out portion of the FPC board and an increase in cost of the FPC board do not occur.
In addition, as display modules are becoming smaller and thinner, FPC boards are also becoming smaller and thinner, and it is extremely possible to expand the area where through holes can be designed by a simple method such as the present invention. is important.

In the display module of the present invention, it is preferable that a through hole is formed in the FPC board, and the through hole is formed at a position where the FPC board faces the bending suppressing member.

In the vicinity of the outlet opening from which the FPC board is led out, many through holes are used for collecting wiring to the connection terminals. According to the display module of the present invention, since the FPC board is formed at a position facing the bending suppressing member, the FPC board at the position where the through hole is formed is difficult to bend. Is difficult to damage.

Moreover, in the display module of this invention, it is preferable that the said bending suppression member is provided in the exit opening of the said housing | casing so that it may be hold | maintained in the shape of a cantilever.

According to the display module of the present invention, since the bending suppressing member is held in a cantilever shape, the bending can be restricted so that the FPC board does not have a smaller curvature radius, and the through hole is not easily damaged. Become.

In the display module of the present invention, the casing is made of a metal material, and the bending suppressing member is made of an insulating material and is provided on the casing so as to overlap the FPC board in a plan view. It is preferable.

If the housing of the display module is made of a metal material, a high-strength housing can be obtained and high-frequency noise can be prevented from leaking to the outside, but the FPC board is easily scratched. Short circuit is likely to occur with the FPC board. According to the display module of the present invention, since the bending suppressing member is made of an insulating material and is formed so as to overlap in a plan view of the FPC board, the FPC board is sharply cut by the vibration or the like. In addition to avoiding damage on the surface, a short circuit between the FPC board and the housing is also suppressed.

In the display module of the present invention, the casing is provided with an opening for avoiding contact with an electrical component mounted on the FPC board, and the bending suppressing member is formed so as to cover the periphery of the opening. It is preferable that

According to the display module of the present invention, even if the thickness of the casing is small, the electrical component formed on the FPC board is not brought into contact with the casing by the opening formed in the casing. Since the bending suppression member is provided at the periphery of the opening, the electrical component is prevented from coming into contact with the opening of the housing due to vibration or the like.

Moreover, in the display module of this invention, it is preferable that the said reinforcement member consists of material which has bending elasticity.

When the reinforcing member is made of a bending elastic member, the bending can be restricted by the reinforcing member so that the FPC board does not have a smaller radius of curvature. Therefore, according to the display module of the present invention, the through hole is less likely to be damaged.

Moreover, in the display module of this invention, it is preferable that the said bending suppression member consists of a polyethylene terephthalate film.

Polyethylene terephthalate film has high strength and good electrical insulation. According to the display module of the present invention, since the high-strength, good electrical insulating polyethylene terephthalate is used as the bending suppressing member, the FPC board is less likely to be scratched, and a short circuit between the FPC board and the casing is also caused. It will be suppressed.

Furthermore, in order to achieve the above object, an electronic apparatus according to the present invention includes the display module according to any one of claims 1 to 7.

According to the electronic apparatus of the present invention, the design time can be shortened by increasing the degree of freedom in designing the through hole of the FPC board and the mounting position of the electrical component, and the FPC board can be prevented from becoming large. Thus, an electronic device using a display module that can be used is obtained.

FIG. 3 is an exploded perspective view of the display module according to the first embodiment. 2A is a plan view of the display module according to the first embodiment with the outer frame removed, and FIG. 2B is a bottom view of FIG. 2A. 3A is a cross-sectional view taken along line IIIA-IIIA in FIG. 2A, and FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. 2A. 4A is a plan view of the display module according to the second embodiment with the outer frame removed, and FIG. 4B is a cross-sectional view taken along the line IVB-IVB in FIG. 4A.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the embodiments and drawings. However, the embodiments shown below are not intended to limit the present invention to those described herein.
The present invention can be equally applied to various changes made without departing from the technical idea shown in the claims. In each drawing used for the description in this specification, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing. However, it is not necessarily displayed in proportion to the actual dimensions.

[First embodiment]
The display module 10 of 1st Embodiment of this invention is demonstrated using FIGS. 1-3. The display module 10 according to the first embodiment stores a transmissive liquid crystal display panel 11, a backlight unit 12 disposed on the back of the display panel 11, and the display panel 11 sandwiched between the backlight unit 12. An outer frame 13 is provided. As shown in FIGS. 1 and 3A, the display panel 11 includes a liquid crystal layer 1.
4, an array substrate 15 and a color filter substrate 16 that sandwich the substrate 4, and a sealing material 17 that surrounds the periphery of the liquid crystal layer 14 to prevent liquid crystal from leaking. The display panel 11 includes
A first FPC board 18 for driving for receiving a video signal and the like from an external control board (not shown) and supplying power is connected. The first FPC board 18 is a double-sided FPC board in which a pattern is formed on both sides and a through hole for electrically connecting the patterns on both sides is formed.

As shown in FIG. 1, the backlight unit 12 includes a bottom case 19, a bending suppression member 20, a reflection sheet 21, an inner frame 22, a light guide plate 23, and a plurality of optical sheets 24 that are superimposed from the back side of the display module 10. (In this embodiment, it consists of one diffusion sheet 25 and one prism sheet 26) and a second FPC board 27 disposed on the side surface of the light guide plate 23.

The bottom case 19 is formed, for example, by pressing a stainless steel plate having a thickness of 0.3 mm. The bending suppression member 20 is made of a PET (polyethylene terephthalate) film having bending elasticity, and is adhered to the bottom case 19 with two double-sided tapes 28 (see FIG. 3A). The reflection sheet 21 is held in the inner frame 22 by fitting a concave portion and a convex portion (not shown), and is used to reflect light from the LED 29 that is a backlight light source toward the display panel 11. is there.

The inner frame 22 is formed by injection molding of a synthetic resin material, and has a frame shape having a large opening 22a through which light from the backlight passes. As shown in FIGS. 1 and 3A, the projection 22c on the side wall 22b of the inner frame 22 and the fitting hole 21b on the side wall 19a of the bottom case 19 are fitted together, so that the inner frame 22 and the bottom case 19 are mechanically connected. Are combined. The light guide plate 23 is made of transparent PMMA (polymethylmethacrylate), and is held on the inner frame 22 by fitting a concave portion and a convex portion (not shown). The side surface that becomes the light incident surface of the light guide plate 23 is processed to have unevenness to make the luminance of the incident light from the LED 29 uniform, and the upper surface that becomes the light exit surface collects light in a desired direction. The process of the unevenness for performing is performed.

The diffusion sheet 25 diffuses the emitted light from the light guide plate 23 so that the luminance is uniform, and the prism sheet 26 condenses the light emitted from the light guide plate 23 on the display panel 11 side. As shown in FIG. 1, the extended portion 24 a of the two optical sheets 24 is a recess 22 of the inner frame 22.
The optical sheet 24 is positioned by being inserted into d. The second FPC board 27 is provided with a plurality of LEDs 29 that emit white light to the display panel 11. The second FPC board 27 is attached to the display panel 11 so that the LED 29 is disposed to face the side surface that becomes the light incident surface of the light guide plate 23. The end of the second FPC board 27 opposite to the LED 29 is electrically connected to the first FPC board 18 by soldering.

The other end of the first FPC board 18 whose one end is electrically connected to the display panel 11 is the reflection sheet 2.
1 and the bending suppressing member 20 are shaped by bending 180 degrees. The display panel 11 has an inner frame 2
2 is adhered by a double-sided tape (not shown). As shown in FIG.
For example, it is formed by pressing a stainless steel plate and has a frame shape having a large opening 13a serving as a display window in the center. When the fitting hole 13c of the side wall 13b of the outer frame 13 and the projection 19c of the side wall 19a of the bottom case 19 are fitted, the outer frame 13 and the bottom case 19 are mechanically coupled. The display panel 11 is held between the two.

With the above-described configuration, the light emitted from the LEDs 29 of the second FPC board 27 is diffused on the side surface of the light guide plate 23, reflected and diffused by the reflection sheet 21, and the luminance in a predetermined direction is increased by the light guide plate 23. Then, the light is condensed in the display direction by the prism sheet 26 and applied to the back surface of the display panel 11.

Next, the configuration of the bending suppressing member 20 will be described in detail with reference to FIGS. 1 and 2B. The bottom case 19 to which the bending suppressing member 20 is attached is provided with an opening 19e in a portion of the bottom plate 19d facing the region 18a on which the electrical component of the first FPC board 18 is mounted. This opening 1
9e is disposed on the first FPC board 18 because the accommodation height of the first FPC board 18 between the bottom case 19 and the reflection sheet 21 is low because the display module 10 needs to be thin. This is an escape hole that allows the electrical component to be accommodated. Also, the side wall 19a of the bottom case 19
The outlet opening 1 through which the lead-out portion 18b, which is the other end side of the first FPC board 18, is led out of the housing.
9f is provided. The end face of the outlet opening 19f has a hemming process (180 for preventing scratches).
The bending part 19g by which the bending process of the degree was carried out is formed.

The bending suppressing member 20 is provided with an opening 20a smaller than the opening 19e of the bottom case 19, covers the periphery of the opening 19e of the bottom case 19, and also has a bent portion 19g of the bottom case 19,
The lead portion 18b of the first FPC board 18 is partially covered. As shown in FIGS. 2B and 3B, the first FPC board 18 is provided with fitting holes 18c and fitting notches in the two dowels 22e on the back side of the inner frame 22 for positioning on the back side of the first FPC board 18. 18d (FIG. 1
Is inserted. Further, the bending suppressing member 20 is provided with a notch 20b in order to avoid contact with the two dowels 22e of the inner frame 22. The length of the lead-out portion 18b that is the exposed portion of the first FPC board 18 is L1, as shown in FIGS. 2B and 3B. Moreover, the bending suppression member 20 is extended from the bending part 19g of the bottom case 19 to the surface of the side wall 13b (refer FIG. 1) of the outer frame 13, and the length of this extension part is L2.

A connection terminal 1 connected to an external electronic device is provided at the tip of the lead-out portion 18c of the first FPC board 18.
8e is formed. In the first FPC board 18, it is particularly desirable to form through holes as close as possible to the vicinity of the outlet opening 19 f of the bottom case 19 in order to collect the wiring to the connection terminals 18 e that are narrow in width. Therefore, it is desirable that the first FPC board 18 has a wide through hole forming region in the vicinity of the outlet opening 19f. However, as disclosed in Patent Document 3 above, the through hole and the periphery of the through hole are vulnerable to bending and may be damaged when bent with a small radius of curvature. A bent part 19
It is difficult to form a through hole in the first FPC board 18 at a position exceeding g, and if a through hole is to be formed, a reinforcing plate is attached to the first FPC board 18 itself, so that the first FPC board 18 Problems such as an increase in thickness and an increase in cost have occurred.

Note that increasing the area of the through hole formation region of the first FPC board 18 by further extending the bent portion 19g prevents the first FPC board 18 from easily coming out of the positioning dowel 22e. Since the dowels 22e need to be extended to the exposed surface of the bottom case 19 and the mold for manufacturing the bottom case 19 needs to be changed, it cannot be adopted immediately. Further, when the bent portion 19g is extended to be flush with, for example, the end portion of the outer frame 13, the through hole formation area increases, but the position where the first FPC board 18 can be bent is 19g.
Since the bending position of the first FPC board 18 protrudes to the outside of the outer frame 13, the outer shape of the display module 10 itself becomes large. Of course, when a display module is incorporated in an electronic device, that much space is required.

Therefore, in the present invention, as described above, the bending suppressing member 20 is provided with the extending portion 20c extending beyond the bending portion 19g by L2. Since the extending portion 20c can easily extend the starting position of the bending of the first FPC board 18, the through-hole formation region can be expanded accordingly. The length L2 of the extending portion 20c of the bending suppressing member 20 is a length that does not exceed the casing (here, the bottom case 19 and the outer frame 13), but the length of L2 is an arbitrary length. be able to. Further, since the extending portion 20c of the bending suppressing member 20 is held in a cantilever shape, it can be easily bent. And the bending suppression member 20 is a PET film, for example, and has bending elasticity. For this reason, the first FPC board 18 in the vicinity beyond the tip of the extended portion 20c of the bending suppressing member 20 does not bend with a small radius of curvature, so that the through-hole formation region extends to a position exceeding L2. It can be expanded.

The bending suppressing member 20 made of an insulating PET film is formed so as to cover the first FPC board 18 between the bottom case 19 made of a conductive stainless steel and the first FPC board 18 in plan view. Thereby, it is possible to prevent the first FPC board 18 from coming into direct contact with the bottom case 19 and short-circuiting. The bottom case 19 is provided with an opening 19e that allows the electrical components of the first FPC board 18 to be accommodated. Since the opening 19e is formed by pressing, its cut surface, particularly the core side (variable The side on which is exposed is sharp. Therefore, the bending suppressing member 20 is provided with an opening 20a that is smaller than the opening 19e of the bottom case 19, and the bottom case 19 is provided.
The periphery of the opening 19e is covered with the bending suppressing member 20. Thereby, the first FPC board 18 and the operator's finger are hardly damaged by the opening 19e of the bottom case 19. Moreover, since the bending suppression member 20 is a PET film having both bending elasticity and insulation, both the effects of bending elasticity and the short-circuit suppression effect of insulation can be exhibited simultaneously.

[Second Embodiment]
Next, the display module 40 of 2nd Embodiment is demonstrated using FIG. However, FIG. 4A is a figure corresponding to FIG. 2B of 1st Embodiment, and FIG. 4B is a figure corresponding to FIG. 3A of 1st Embodiment. In the display module of the second embodiment shown in FIG. 4, the same reference numerals are given to the same components as those of the display module 10 of the first embodiment, and detailed description thereof is omitted. The display module 40 of the second embodiment is different from the display module 10 of the first embodiment in that the FPC board is derived from the side surface of the housing in the display module 10 of the first embodiment. The display module 40 of the second embodiment is derived from the bottom case 41 of the housing.

As shown in FIG. 4B, the display module 40 of the second embodiment has a larger separation distance between the bottom case 41 and the reflection sheet 21 than the display module 10 of the first embodiment. The first FPC board 42 can be accommodated without forming an opening for a relief hole that allows the electrical components arranged on the surface of the first FPC board 42 to be accommodated. An outlet opening 41b through which the lead-out portion 42a of the first FPC board 42 is led out is formed in the bottom plate 41a of the bottom case 41. The outlet opening 41b of the bottom case 41 is provided with the first FPC board 4
The first side 41c, where 2 is the inside of the housing, is not scratched to prevent scratches and is simply cut. Z bending is performed on the second side 41d of the outlet opening 41b of the case 41 where the first FPC board 42 is located outside the casing. This Z bending process is the first FPC
While preventing the board | substrate 42 from being damaged, the reflective sheet 21 and the light-guide plate 23 are supported. A space between the first side 41c and the second side 41d is an insertion empty portion of the lead-out portion 42a of the first FPC board 42. As shown in FIG. 4B, the first FPC board 42 has an outlet opening 41 of the bottom case 41.
Only L3 is derived from the first side 41c of b. That is, the length of the lead-out portion 42a of the first FPC board 42 is L3.

The bend suppressing member 43 of the second embodiment is made of a PET sheet as in the case of the bend suppressing member 20 of the first embodiment, and is planarly viewed across the entire area of the FPC substrate 42 between the first FPC substrate 42 and the bottom case 41. Are arranged so as to overlap each other. The bending suppressing member 43 extends from the first side 41c of the bottom case 41 by L4. That is, the length of the extending portion 43a of the bending suppressing member 43 is L4. Even in this case, the display module 40 according to the second embodiment can increase the through-hole formation region and the electrical component mounting region as in the display module 10 according to the first embodiment. Further, the bending suppressing member 43 has a first side 41c.
Since the sharp cut surface is covered, the FPC board 42 and the operator's finger are prevented from being damaged.

In the display modules 10 and 40 of the first embodiment and the second embodiment described above, the description of a specific example of the display control circuit is omitted.
The present invention can also be applied to a display module formed on an FPC board. When the display control circuit is provided in the display modules 10 and 40 of the first embodiment and the second embodiment,
In order to prevent leakage of high frequency noise, the display module 1 of the first embodiment and the second embodiment
0 and 40 are arranged in a metal casing that also serves as a shield. In that case, the outlet opening for leading out the FPC board formed on the bottom plate of the metal housing is designed to be narrow, but according to the display module of the present invention, the FPC board is not bent with a small radius of curvature. For,
It is encouraged that the through hole is damaged. The display module of the present invention can be applied not only to the liquid crystal display panel described above but also to a display module using a thin flat panel such as an organic EL display panel.

The example of the display module has been described above as an embodiment of the present invention. Such a display module of the present invention can be used in various electronic devices such as a personal computer, a mobile phone, a portable information terminal, and a car navigation system. Since the basic configuration of these various electronic devices is well known to those skilled in the art, detailed description thereof is omitted.

DESCRIPTION OF SYMBOLS 10 ... Display module 11 ... Display panel 12 ... Backlight part 13 ... Outer frame 13
a ... opening of outer frame 13b ... sidewall of outer frame 13c ... fitting hole of outer frame 14 ... liquid crystal layer 15 ... array substrate 16 ... color filter substrate 17 ... sealing material 18 ... first FPC substrate 18
a ... first FPC board mounting part 18b ... first FPC board lead-out part 18c ... first FPC board fitting hole 18d ... first FPC board fitting notch 18e ... first FPC board connection terminal 19 ... bottom case 19a ... bottom case Side wall 19b ... Bottom case fitting hole 19c ... Bottom case protrusion 19d ... Bottom case bottom plate 19e ... Bottom case opening 19f ... Bottom case outlet opening 19g ... Bottom case bent portion 20 ... Bending suppression member 20a ... Bending Opening of suppression member 20b ... Notch of bending suppression member 20c ... Extension portion of bending suppression member 21 ... Reflective sheet
22 ... Inner frame 22a ... Inner frame opening 22b ... Inner frame side wall 22c ... Inner frame projection 22d ...
Inner frame recess 22e ... Inner frame dowel 23 ... Light guide plate 24 ... Optical sheet 24a ... Optical sheet extension 25 ... Diffusion sheet 26 ... Prism sheet 27 ... Second FPC board 28 ...
Double sided tape 29 ... LED 40 ... Display module 41 ... Bottom case 41a Bottom plate of bottom case 41b ... Outlet opening of bottom case 41c ... First side of bottom case 41d ... Second side of bottom case 42 ... First FPC board 42a ... First FPC Substrate lead-out portion 43 ... Bending suppression member
43a: Extension portion of the bending suppressing member

Claims (6)

A display panel;
A flexible printed circuit board;
A display module having a housing for housing the display panel and the flexible printed wiring board,
The flexible printed wiring board has a lead-out portion led out from an outlet opening provided in the housing,
The housing is formed of a metal material,
Wherein the housing, the superimposed flexible printed wiring board in plan view and opening to avoid contact between electrical components mounted on the flexible printed circuit board, before Kishirube out portion and a position opposed to the opening said Viewing module and the bending preventing member made of an insulating material that provided extending from the outlet opening so as to cover the periphery of. Wherein the flexible printed circuit board has through-holes are formed, the display module according to the 請 Motomeko 1 through holes that are formed in a position and the bending prevention member and the outlet portion is opposed. The bending suppressing member, the display module according to 請 Motomeko 1 or 2 that are provided in the front Kide port opening to be held in the cantilever.   The display module according to claim 1, wherein the bending suppressing member is made of a material having bending elasticity.   The display module according to claim 4, wherein the bending suppressing member is made of a polyethylene terephthalate film.   An electronic device comprising the display module according to claim 1.

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