KR20070121164A - Liquid crystal display module - Google Patents

Abstract

An LCD module is provided to join a PCB to a cover bottom stably by using a join structure. A backlight unit is positioned below an LCD panel, wherein the backlight unit includes a lamp array and a cover bottom(130) for wrapping a lateral portion and a lower portion of the lamp array. A board assembly unit(155) is positioned above a rear surface of the cover bottom. An FPC(Flexible Printed Circuit) connects one side of the LCD panel and the board assembly unit. A groove(155a) is formed on both sides of the board assembly unit. A join structure(157) is protruded from the cover bottom, and inserted into the groove of the board assembly unit. The join structure is engaged with a portion of the board assembly unit.

Description

Liquid Crystal Display Module

1 is an exploded perspective view showing a conventional liquid crystal display module

2A and 2B are process perspective views illustrating a top and a rear surface of a conventional liquid crystal display module.

3A and 3B are perspective views showing a state in which the guide panel is assembled on the backlight unit, viewed from the top and back surfaces;

4A and 4B are front and side views illustrating a fastening structure between a board assembly unit and a cover bottom of a conventional liquid crystal display module;

5 is a view of a board assembly unit and a cover bottom of a conventional liquid crystal display module viewed in a perspective direction;

6 is a view illustrating a lifting phenomenon between a board assembly unit and a cover bottom of a conventional liquid crystal display module.

7 is a perspective view showing a liquid crystal display module of the present invention.

8 is a front view illustrating a fastening structure between a board assembly unit and a cover bottom of the liquid crystal display module of the present invention.

9 is a side view illustrating a fastening structure between a board assembly unit and a cover bottom of the liquid crystal display module of the present invention.

FIG. 10 is a view of the portion of FIG. 9 as seen from a front perspective direction. FIG.

* Description of the symbols for the main parts of the drawings

130: cover bottom 146: guide panel

148: inverter cover 150: board assembly cover

155: board assembly unit 157: fastening structure

160: backlight unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display module which allows a fastening to be performed stably without lifting between a cover bottom and a printed circuit board (PCB).

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELD), and vacuum fluorescent (VFD) Various flat panel display devices such as displays have been studied, and some of them are already used as display devices in various devices.

Among them, LCD is the most widely used as the substitute for CRT (Cathode Ray Tube) for mobile image display device because of its excellent image quality, light weight, thinness, and low power consumption. In addition to the use of the present invention has been developed in various ways such as a television and a computer monitor for receiving and displaying broadcast signals.

In order to use such a liquid crystal display as a general screen display device in various parts, it is a matter of how high quality images such as high definition, high brightness and large area can be realized while maintaining the characteristics of light weight, thinness and low power consumption. Can be.

A general liquid crystal display device includes a liquid crystal panel for displaying an image, wherein the liquid crystal panel is a liquid crystal layer injected between the first and second glass substrates bonded to each other with a predetermined space and the first and second glass substrates. It is composed.

The first glass substrate (TFT array substrate) may include a plurality of gate wires arranged in one direction at a predetermined interval, a plurality of data wires arranged at regular intervals in a direction perpendicular to the respective gate wires, A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing gate lines and data lines, and a plurality of thin film transistors switched by signals of the gate lines to transfer signals of the data lines to each pixel electrode. Is formed.

The second glass substrate (color filter substrate) includes a light shielding layer for blocking light in portions other than the pixel region, an R, G, and B color filter layers for expressing color colors, and a common electrode for implementing an image. Is formed.

The driving principle of the general liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. Since the liquid crystal is thin and long in structure, the liquid crystal has directivity in the arrangement of molecules, and the direction of the arrangement of molecules can be controlled by artificially applying an electric field to the liquid crystal.

Such a liquid crystal display includes a process of manufacturing a lower array substrate on which thin film transistors and pixel electrodes are arranged, a process of manufacturing an upper color filter substrate including a color filter and a common electrode, an arrangement of the two substrates manufactured, and a liquid crystal material It is formed by a liquid crystal cell process consisting of injection, encapsulation, and polarizer attachment.

A general liquid crystal display device includes a liquid crystal display module, a system for applying power required for driving the liquid crystal display module and generating a control signal for driving the liquid crystal display module and the liquid crystal display module and the system to protect from the outside. It consists of an external case.

The outer case is a material for protecting the liquid crystal display module and the system, and is a component having a buffering effect against impact, and casings the liquid crystal display module and the system under conditions that do not reduce the efficiency of the display area.

Hereinafter, a conventional liquid crystal display module will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing a conventional liquid crystal display module.

As shown in FIG. 1, the conventional liquid crystal display module 10 is largely a board assembly unit for driving a liquid crystal panel 11, a back light unit 15, and the liquid crystal panel 11. 40, a case top (Case top) 20 is made.

Here, the liquid crystal panel 11 includes a first substrate on which a TFT array is formed, a second substrate on which a color filter array is formed, and a liquid crystal layer formed between the first and second substrates.

The first substrate (TFT array substrate) has a plurality of gate lines arranged in one direction at regular intervals, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines, and the gate lines; A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing data lines and a plurality of thin film transistors that are switched by signals of the gate lines to transfer signals of the data lines to each pixel electrode are formed.

The second substrate (color filter substrate) includes a light shielding layer for blocking light in portions other than the pixel region, an R, G, and B color filter layers for expressing color colors, and a common electrode for implementing an image. Is formed.

Further, a first polarizing plate 11a and a second polarizing plate 11b are further formed on the rear surfaces of the second substrate and the first substrate to adjust light transmission according to the alignment of the liquid crystals.

The driving principle of the general liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. Since the liquid crystal is thin and long in structure, the liquid crystal has directivity in the arrangement of molecules, and the direction of the arrangement of molecules can be controlled by artificially applying an electric field to the liquid crystal.

The board assembly unit 40 may include a gate drive IC and a data drive IC for applying driving signals to gate lines and data lines of the liquid crystal panel, and a gate PCB 40a for controlling the respective drive ICs. And a source PCB 40b. Here, the gate drive IC and the data drive IC are respectively embedded in the tape carrier package (TCP) films 41a and 41b and connected to the first substrate, the gate, and the source PCBs 40a and 40b, respectively. The TCP films 41a and 41b are directly attached to the first substrate, the gate and the source PCBs 40a and 40b by using a conductive resin. The TCP film has a structure in which a metallic conductive layer is inserted in a single layer or multiple layers between layers of a flexible material such as polyamide.

On the other hand, in some cases, the gate or data drive IC can be embedded in the liquid crystal panel, in which case the PCB can be easily integrated by mounting one integrated circuit.

The gate and source PCBs 40a and 40b are connected to a system (not shown) outside the liquid crystal display 10, and are supplied with power and receive a control signal for driving.

The backlight unit 15 uniformly spreads a lamp array (not shown), a cover bottom 13 surrounding the bottom and the periphery of the lamp array, and light emitted from the lamp array over the entire surface. It consists of an optical plate / sheet 12 which is transmitted to the liquid crystal panel 11 side.

Here, a reflection plate (not shown) is formed in contact with the inside of the cover bottom 13, and a lamp array is positioned on the reflection plate, and the diffusion or protection sheet 12a and the first prism sheet 12b are sequentially disposed on the reflection plate. An optical plate / sheet 12 consisting of a second prism sheet 12c and a diffusion or protective sheet 12d is included.

In addition, a case top is formed in a shape that surrounds upper edges and sides of the liquid crystal panel 11 and the backlight unit 15. At this time, the board assembly unit 40 is folded and positioned below the cover bottom 13, and is protected from the outside through a subsequent casing operation.

Hereinafter, an assembly process of the liquid crystal display will be described with reference to the drawings.

2A and 2B are process perspective views illustrating a top and a rear surface of a conventional liquid crystal display module, and FIGS. 3A and 3B are views of an assembly of a guide panel on a backlight unit, viewed from the top and rear surfaces thereof. Is a perspective view.

As shown in FIG. 2A, a conventional liquid crystal display module first prepares a backlight unit 45 including a lamp array (not shown) including a plurality of lamps and a cover bottom surrounding a lower surface and a side of the lamp array. .

Subsequently, a plurality of optical sheets (not shown) are disposed on the backlight unit 45.

Subsequently, the panel guide 46 is formed to surround the upper edge of the backlight unit 45 and the plurality of optical sheets.

At this time, when the back surface of the backlight unit 45 is observed, it is as shown in Fig. 2b. Here, the cover bottom has a lower surface on which the lamp array is seated, side surfaces of both sides of the lower surface which are connected to the lower surface and have a height greater than or equal to the thickness of the lamp array, and extend from the side surfaces of both sides to be parallel to the lower surface. It comprises an upper surface formed with a step and a lower surface in the horizontal plane direction.

The guide panel 46 is a structure defining a position where a liquid crystal panel (not shown) corresponds to an upper portion of the backlight unit 45. The guide panel 46 is made of a material having a high plasticity. At this time, the guide panel 46 partially covers the backlight unit 45 and supports the backlight unit 45.

On the other hand, a liquid crystal panel (not shown) is mounted on the guide panel 46 to integrate the liquid crystal panel and the backlight unit 45.

As shown in FIG. 3A, a board assembly unit (not shown, obscured by 50, see 55 of FIGS. 4A to 6) formed in connection with a liquid crystal panel to generate a driving signal in the liquid crystal panel includes a liquid crystal panel and a backlight unit ( 45) It is folded to the lower rear surface and is located at a predetermined portion of the upper side of the rear surface of the cover bottom 30. That is, when the board assembly unit is folded from the liquid crystal panel to the backlight unit, the board assembly unit will correspond to the upper and lower surfaces of the cover bottom 30.

In the illustrated figure, the board assembly unit is a form in which the gate drive IC and the gate PCB are mounted in the liquid crystal panel, so that only one source PCB is configured as the board assembly unit and connected to a predetermined portion of the upper side of the liquid crystal panel. The board assembly unit is formed on one side of the liquid crystal panel and is folded downward to form a board assembly cover 50 thereon so as to be in contact with the rear surface of the cover bottom 30, thereby forming the board assembly unit from the outside. Protect and shield. Here, the board assembly cover 50 is formed of a metallic material through a mold.

In addition, inverters 47a and 47b that apply voltage signals to the plurality of lamps are disposed on both rear surfaces of the backlight unit 45, that is, rear surfaces of the cover bottom 30. Here, the inverters 47a and 47b are formed on the rear surface of the lower surface, on both the left and right sides of the surface forming the cover bottom 30.

As shown in FIG. 3B, the inverter covers 48a and 48b formed through metal molds are formed on the surfaces of the inverters 47a and 47b to shield the inverters 47a and 47b from the outside. And protect. At this time, the inverter covers 48a and 48b are formed in a shape covering the inverters 47a and 47b on the rear surface of the lower surface of the cover bottom 30.

In this case, the inverter covers 48a and 48b are connected to upper and lower portions through predetermined holes and bolts (not shown) provided on the lower surface of the cover bottom 30, respectively. In addition, the first inverter 47a formed on the left side is formed to partially cover a predetermined thickness of the guide panel 46 on the left side, and on the right side of the first inverter 47a on the bottom surface of the lower surface of the cover bottom 30. 48a) is formed. The inverter 47b formed on the right side is symmetrically, and on the right side, the inverter 47b is formed to partially cover a predetermined thickness of the guide panel 46. On the left side, the inverter 47b is formed on the rear surface of the lower surface 30a of the cover bottom 30. 2 inverter cover 48b is formed.

Herein, the liquid crystal panel (not shown), the guide panel 46, the backlight unit 45, the inverters 47a and 47b, the board assembly unit (not shown, see 55 of FIGS. 4A to 6), and the like, may cover the inverter. 48A, 48B, a board assembly cover 50, a casing top (not shown), and the like, to form a liquid crystal display module 60.

The inverter covers 48a and 48b are performed at the final stage of assembly in the assembling process of the liquid crystal display, and a main role is to safely block high current flowing through the inverters 47a and 47b to the outside.

The size and number of the inverter covers 48a and 48b may be changed according to the size and number of the inverters 47a and 47b.

Positions of the inverters 47a and 47b are attached to the left and right sides of the rear surface of the cover bottom 30. Due to the characteristics of the inverters 47a and 47b, it is a common case that the inverters are alternately assembled in the upper left, lower right or lower left, and the upper right. As shown in the figure, when the sizes of the inverters 47a and 47b are formed substantially equal to the vertical lengths of the cover bottoms 48a and 48b on the left and right, the left and right balances are assembled.

4A and 4B are front and side views illustrating a fastening structure between a board assembly unit and a cover bottom of a conventional liquid crystal display module.

4A and 4B, the board assembly unit 55 has grooves formed at both sides thereof, and the board assembly unit 55 is formed by lifting the structure 57 of the cover bottom 30 from the bottom through the groove. The left and right and the up and down of the 55 is prevented. That is, since the structure 57 is located at both sides with respect to the board assembly unit 55, it is possible to prevent left and right twisting, and the structure 57 has a predetermined length in the vertical direction and the board assembly unit 55. Since it fits in the groove | channel of (), it becomes possible to prevent twisting of the up-down direction.

FIG. 5 is a view showing a fastening between a board assembly unit and a cover bottom of a conventional liquid crystal display module in a perspective direction, and FIG. 6 is a diagram illustrating a lifting phenomenon between the board assembly unit and a cover bottom of a conventional liquid crystal display module.

However, as shown in FIGS. 4A and 4B and FIG. 5, the board assembly unit 55 may be fixed to the left and right positions by the structure 57 of the cover bottom 30 positioned at both sides. Similarly, one side of the board assembly unit 55 close to the FPC 62 may be formed by the tension of the flexible printed circuit (FPC) connecting the board assembly unit 55 to the liquid crystal panel (not shown). The phenomenon of floating at a certain interval from the back of 30) occurs.

As such, when the board assembly unit 55 is mounted on the rear surface of the cover bottom 30, the board assembly unit 55 is tensioned by the tension of the FPC 62 connecting the liquid crystal panel connected to the board assembly unit 55. The phenomenon of floating in the Z direction from the back surface of the cover bottom 30 occurs. As a result, a problem arises in that the board assembly unit 55 detaches from the surface of the cover bottom 30, and thus, mounting of the cover shield (see 50 of FIG. 3B) covering the board assembly unit 55 is difficult.

The conventional liquid crystal display module as described above has the following problems.

In the conventional liquid crystal display module, a structure having a predetermined length in the vertical direction from the bottom of the cover protrudes and is fitted to both sides of the board assembly to support the board assembly unit and prevent the twist. However, in this case, the effect is only in the XY direction on the plane. It is difficult to support the board assembly unit in the Z direction from the cover bottom surface, and a lifting phenomenon occurs.

Thus, there is an attempt to improve lifting by interposing a double-sided tape between the cover bottom and the board assembly unit. However, the use of the double-sided tape is expected to increase the cost and difficulty of work, and increase the number of work steps. In addition, the repair process is difficult after the double-sided tape interposed, there is a risk that the defect is caused.

The present invention has been made to solve the above problems to provide a liquid crystal display module that can be securely fastened without lifting between the cover bottom and the printed circuit board (PCB), an object thereof.

According to an aspect of the present invention, there is provided a liquid crystal display module including a liquid crystal panel, a backlight unit disposed under the liquid crystal panel, and including a lamp array and a cover bottom surrounding side and bottom of the lamp array; A board assembly unit located above the bottom of the cover bottom, a flexible printed circuit (FPC) connecting the board assembly unit from one side of the liquid crystal panel, grooves entering both sides of the board assembly unit, and protruding from the cover bottom It is characterized in that it comprises a fastening structure that is engaged with a predetermined portion of the board assembly unit.

The fastening structure of the cover bottom is a 'b' shape. Here, the '-' portion of the '-' portion overlaps the board assembly unit at the top of the board assembly unit, and the '│' portion is located in the groove of the board assembly unit.

The cover bottom and the fastening structure are integral.

Hereinafter, the liquid crystal display module of the present invention will be described in detail with reference to the accompanying drawings.

7 is a perspective view illustrating a liquid crystal display module of the present invention.

As shown in FIG. 7, the liquid crystal display module of the present invention surrounds a liquid crystal panel (not shown), a lamp array (not shown) consisting of a plurality of lamps first below the liquid crystal panel, a lower surface of the lamp array, and a side portion thereof. It includes a backlight unit including a cover bottom.

Although not shown, a plurality of optical sheets (not shown) are disposed on the backlight unit, and a panel guide 146 is formed to surround upper edges of the backlight unit and the plurality of optical sheets.

At this time, when the lower side of the backlight unit is observed, the cover bottom 130 is positioned, and the cover bottom 130 has a lower surface on which the lamp array is seated and a thickness of the lamp array connected to the lower surface. Side surfaces of both sides of the lower surface formed at the above height, and the upper surface is formed to have a step with the lower surface in the horizontal plane direction parallel to the lower surface extending again from the sides of the both sides.

The guide panel 146 is a structure defining a position where a liquid crystal panel (not shown) corresponds to an upper portion of the backlight unit, and is mainly made of a material having a high plasticity. At this time, the guide panel 146 partially covers the side of the backlight unit and supports the backlight unit.

Meanwhile, a liquid crystal panel (not shown) is mounted on the guide panel 146 to integrate the liquid crystal panel and the backlight unit.

In addition, a board assembly unit (not shown, obscured by 150) which is formed by being connected by the liquid crystal panel and the FPC (see 62 in FIG. 6, obscured by 150) to generate a drive signal in the liquid crystal panel, And it is folded to the lower back of the backlight unit is located on a predetermined portion of the rear upper portion of the cover bottom 130.

In the illustrated figure, the board assembly unit is a form in which the gate drive IC and the gate PCB are mounted in the liquid crystal panel, so that only one source PCB is configured as the board assembly unit and connected to a predetermined portion of the upper side of the liquid crystal panel. The board assembly unit is formed on one side of the liquid crystal panel, is folded downward to be in contact with the rear surface of the cover bottom 130, and the board assembly cover 150 is formed thereon to form the board assembly unit. Protect and shield from the outside. Here, the board assembly cover 150 is formed of a metallic material through a mold.

In addition, an inverter (not shown by 148) that applies a voltage signal to the plurality of lamps is disposed on the rear surface of the backlight unit, that is, on both sides of the rear surface of the cover bottom 130. Here, the inverter is formed on the rear surface, the left and right both sides of the lower surface of the surface forming the cover 130.

In addition, similar to the board assembly unit, the inverter cover 148 (148a, 148b) formed through a metal mold is formed on the surface of the inverter to shield and protect the inverter from the outside. In this case, the inverter covers 148: 148a and 148b are formed in a shape of covering the inverter on the rear surface of the lower surface of the cover bottom 130.

In this case, the inverter covers 148: 148a and 148b are connected to upper and lower portions through predetermined holes and bolts (not shown) provided on the lower surface of the cover bottom 130, respectively.

The inverter covers 148: 148a and 148b are performed in the final stage of assembly in the assembling process of the liquid crystal display, and a main role is to safely block high current flowing through the inverter to the outside.

The size and number of the inverter covers 148: 148a and 148b may be changed according to the size and number of the inverters.

The position of the inverter is attached to the left and right sides of the rear surface of the cover bottom 130, it is a common case that the left and right, left or bottom, right upper and lower sides are assembled in the nature of the inverter, as shown in the figure, the size of the inverter to the left and right When formed substantially equal to the longitudinal length of the cover bottoms 148: 148a and 148b, it will be assembled by balancing left-right balance.

Herein, the liquid crystal panel (not shown), the guide panel 146, the backlight unit, the inverter, the board assembly unit 155, and the like are connected to the inverter cover 148, the board assembly cover 150, and the case top (not shown). It is cascaded to constitute the liquid crystal display module 160.

Hereinafter, the fastening structure of the board assembly unit and the cover bottom of the liquid crystal display module of the present invention will be described with reference to the drawing in which the board assembly unit is visible before the board assembly cover is formed.

8 is a front view illustrating a fastening structure of a board assembly unit and a cover bottom of the liquid crystal display module of the present invention, and FIG. 9 is a side view illustrating a fastening structure of a board assembly unit and a cover bottom of the liquid crystal display module of the present invention.

As shown in FIGS. 8 and 9, the board assembly unit 155 of the liquid crystal display module of the present invention has grooves 155a formed inwardly in predetermined portions on both sides thereof, and rises from the cover bottom 130 into the grooves. The fastening structure 157 is fitted. At this time, the shape of the fastening structure 157 is a 'b' shape, when viewed in the Z direction, the '-' shaped '-' portion of the board assembly unit 155 at the top of the board assembly unit The upper portion overlaps the '│' part in the groove 155a of the board assembly unit 155.

Here, the board assembly unit 155 and the fastening structure 157 are engaged with each other, thereby preventing the problem that the board assembly unit 155 is spaced apart from the surface of the cover bottom 130 (moves in the Z direction). Can be. In addition, since the fastening structure 157 of the cover bottom 130 is raised from the lower portion through the groove 155a of the board assembly unit 155, the left and right and the up and down of the board assembly unit 155 may be prevented. Done. That is, since the fastening structure 157 is located at both sides with respect to the board assembly unit 155, it is possible to prevent left and right distortion (moving in the X direction), and the fastening structure 157 is the cover bottom 130. Protruding from) and the '│' portion of the 'b' shaped fastening structure 157 is caught through the groove 155a, thereby preventing movement in the vertical direction (moving in the Y direction).

FIG. 10 is a view of the portion of FIG. 9 viewed from the front perspective direction. FIG.

As shown in FIG. 10, when the groove 155a of the board assembly unit 155 of the liquid crystal display module of the present invention is enlarged, it is formed integrally with the cover bottom 130, and is formed from the surface of the cover bottom 130. A state of protruding through the groove 155a of the board assembly unit 155 to form a 'b' shaped fastening structure 157 may be observed. At this time, the '-' portion of the 'b' shaped fastening structure 157 partially covers the surface of the board assembly unit 155 so that the liquid crystal panel and the board assembly unit 155 may be FPC (Flexible). Lifting of the board assembly unit 155 may be prevented by the tension of the printed circuit (not shown). Here, the '-' part of the fastening structure 157 does not occur as much space as possible with the board assembly unit 155, so that the board assembly unit 155 occurs due to the tension of the FPC. Prevent it.

By forming a fastening structure that engages with the board assembly unit 155 from such a projection, the board assembly unit 155 and the cover bottom 130 are firmly fastened so that the board assembly unit 155 covers the cover. Lifting phenomenon from the bottom 130 can be prevented, whereby the board assembly cover (157 of FIG. 7) covering the board assembly unit 155 can be stably formed on the cover bottom 130 without additional inclusions. Can be formed. Accordingly, the assembly process at the time of fastening the board assembly cover is easy, and the working process is easy, so that working time can be reduced and cost can be reduced.

The liquid crystal display module and its manufacturing method of the present invention as described above has the following effects.

Firstly, grooves that are inwardly formed on both sides of the board assembly unit are formed, and a fastening structure having a shape that partially enters the groove of the board assembly unit from the cover bottom and partially overlaps the upper side of the board assembly unit is formed. A fastening structure protruding from the surface can be formed, and the board assembly unit can be prevented from being lifted by the FPC tension.

Second, the lifting of the board assembly unit from the cover bottom surface is prevented, so that the board assembly cover can be easily assembled on the board assembly unit without intervening a separate fastening member. This improves workability, improves productivity, and reduces costs.

Claims (4)

Liquid crystal panels; A backlight unit positioned below the liquid crystal panel and including a lamp array and a cover bottom surrounding the side and the bottom of the lamp array; A board assembly unit positioned above the cover bottom rear surface; A flexible printed circuit (FPC) connecting the board assembly unit from one side of the liquid crystal panel; Grooves on both sides of the board assembly unit; And And a fastening structure protruding from the cover bottom into a groove and engaging with a predetermined portion of the board assembly unit. The method of claim 1, The fastening structure of the cover bottom is a liquid crystal display module, characterized in that the 'b' shape. The method of claim 2, And the '-' portion of the '-' portion overlaps the board assembly unit at an upper portion of the board assembly unit, and the '│' portion is positioned in a groove of the board assembly unit. The method of claim 1, And the cover bottom and the fastening structure are integrated.

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