KR20170080321A - Display device - Google Patents

Abstract

The display device according to the present invention is characterized in that any one of the optical sheets positioned on the rear surface of the display panel is folded to serve as a conventional guide panel, that is, to prevent light leakage, light leakage, and backlight unit storage .
In addition, the conventional light emitting diode printed circuit board is formed in a multi-layer structure, and the LED chip is bended with respect to the surface on which the light emitting diode package is disposed, thereby reducing the size of the bezel by an area occupied by the light emitting diode package.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly to a display device having a narrow bezel.

Active matrix type liquid crystal display devices are being applied to almost all display devices from small mobile devices to large-sized TVs due to their low price and high performance due to development of process technology and driving technology.

The liquid crystal display includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix, a driving circuit for driving the liquid crystal panel, and a backlight unit for irradiating the liquid crystal panel with light. The backlight unit has a direct lower type and an edge type depending on the position of the light source. In the direct type system, a light source is arranged on the back side of the liquid crystal panel. In the edge type system, a light source is arranged on the side side of the liquid crystal panel. The light source of the backlight unit is a fluorescent lamp such as a CCFL or a light emitting diode. Particularly, a light emitting diode is attracting attention as a next generation light source of a backlight unit because of its advantages of high brightness and low power consumption.

Recently, manufacturers of display devices have been doing various researches to realize Narrow bezel. Narrow bezel technology is a technology that increases the aesthetics by enlarging the display area in the same area by reducing the bezel where the image is not displayed.

FIG. 1 is a cross-sectional view showing a light incidence surface of a conventional display device, and FIG. 2 is a cross-sectional view showing a non-light incidence surface of a conventional general display device.

1 and 2, a conventional display device includes a display panel 10, a guide panel 20 for supporting the display panel 10, and a light emitting diode chip 33 as a light source.

The display panel 10 includes a liquid crystal layer filled between an upper substrate 12, a lower substrate 14, and upper and lower substrates 12 and 14. The display panel 10 displays an image by adjusting the light transmittance of liquid crystal molecules having dielectric anisotropy using an electric field.

The guide panel 20 has a frame shape to support the edge area of the display panel 10. [ The guide panel 20 has a stepped surface for supporting the flexible printed circuit board 35 of the backlight unit 30.

The backlight unit 30 includes a light guide plate 31 disposed at a lower portion of the display panel 10, an LED 33 disposed at a side surface of the light guide plate 31, a flexible printed circuit board A reflective film 37 disposed on the back surface of the light guide plate 31 and at least one optical sheet 39 disposed on the upper surface of the light guide plate 31. The light guide plate 31 includes a light-

The plurality of light emitting diode chips 33 are mounted on the back surface of the flexible printed circuit board 35. One side of the flexible printed circuit board 35 is attached to the end face of the guide panel 20 and the other side is attached to the upper face of the light guide plate 31 with reference to the area where the LED 33 is mounted.

However, in the conventional display device as described above, it is difficult to reduce the width of the bezel region in which the light emitting diode chip 33 is disposed, even in the bezel regions corresponding to the edge regions of the display panel 10. This is because, in the case of the bezel region in which the light emitting diode chip 33 is disposed, a margin for accommodating the light emitting diode chip 33 is required except for the width of the guide panel 20. In addition, the flexible printed circuit board 35 is designed not only on the other side attached to the light guide plate 31 but also on one side attached to the end face of the guide panel 20. Therefore, the guide panel 20 must secure an area for supporting one side of the flexible printed circuit board 35, which limits the width of the guide panel 20.

As described above, the bezel region in which the LED 33 is disposed in the liquid crystal display device has a larger width than the remaining bezel regions, and further research is needed to reduce the width of the bezel region in which the LED 33 is disposed.

Therefore, the inventors of the present invention have devised a novel structure in which the guide panel 20 is removed to realize a narrow bezel.

The contents of the background art described above are technical information acquired by the inventor of the present invention for the derivation of the present invention or obtained in the derivation process of the present invention, There is no number.

Disclosure of Invention Technical Problem [8] The present invention has been devised to solve the above-mentioned problems of the related art, and it is a technical object to implement a narrow bezel by deleting a guide panel.

Another object of the present invention is to realize a narrow bezel by bending a light emitting diode printed circuit board.

Another technical problem is to implement a narrow bezel by providing an optical sheet having a novel structure that can replace the guide panel.

In order to achieve the above object, the display device according to the present invention is capable of folding an optical sheet of any one of the optical sheets to serve as a conventional guide panel, that is, to prevent light from being leaked, to prevent leakage of light and to store a backlight unit Feature.

In addition, the conventional light emitting diode printed circuit board is formed in a multi-layer structure, and the LED chip is bended with respect to the surface on which the light emitting diode package is disposed, thereby reducing the size of the bezel by an area occupied by the light emitting diode package.

According to the present invention as described above, the following effects can be obtained.

First, since the thickness of the guide panel can be reduced by deleting the guide panel, it is possible to obtain a display device improved in beauty by implementing a narrow bezel.

Second, by eliminating the guide panel, the assembly process can be simplified.

Third, by deleting the guide panel, it is possible to reduce the parts cost and lighten the display device.

1 is a cross-sectional view showing a light incidence surface of a conventional general display device.
2 is a cross-sectional view showing a non-light-entering surface of a conventional general display device.
3 is a perspective view of a display device according to the present invention.
4 is a perspective view showing an optical sheet according to the present invention.
5 is a perspective view showing a folded state of the optical sheet shown in Fig.
6 is a cross-sectional view showing the light-entering surface of the display device according to the present invention.
7 is a cross-sectional view showing the non-light-entering surface of the display device according to the present invention.
8 is a perspective view showing an optical sheet according to a second embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

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

3 is a perspective view of a display device according to the present invention.

3, a display device 100 according to the present invention includes a display panel 110, a light guide plate 120, a reflection plate 130, optical sheets 140, a light emitting diode printed circuit board 150, 160).

The display panel 110 displays an image using light emitted from a light source module. The display panel 110 includes a lower substrate 111, an upper substrate 113, and a lower polarizing member 113, which are bonded to each other with a liquid crystal layer (not shown) A polarizing plate 115, and an upper polarizing member 117.

The lower substrate 111 is a thin film transistor array substrate. The lower substrate 111 includes a pixel array having a plurality of pixels (not shown) formed in each pixel region intersecting with a plurality of gate lines (not shown) and a plurality of data lines . Each pixel may include a thin film transistor (not shown) connected to a gate line and a data line, a pixel electrode connected to the thin film transistor, and a common electrode formed adjacent to the pixel electrode and supplied with a common voltage.

A pad portion connected to each signal line is provided at one side edge portion of the lower substrate 111, and the pad portion is connected to the panel driving circuit portion. A gate drive circuit (not shown) for supplying a gate (or scan) signal to the gate line is formed in the non-display area on the vertical side of the lower substrate 111. A gate driving circuit is formed together with the thin film transistor manufacturing process of each pixel so as to be connected to each gate line.

The upper substrate 113 includes a pixel defining pattern defining an opening area overlapping each pixel area formed on the lower substrate 111, and a color filter formed in the opening area. The upper substrate 113 is adhered to the lower substrate 111 with a liquid crystal layer interposed therebetween by a sealant.

The liquid crystal layer is sandwiched between the lower substrate 111 and the upper substrate 113. The liquid crystal layer is a liquid crystal layer in which the alignment direction of the liquid crystal molecules is changed according to an electric field formed by a data voltage applied to the pixel electrode and a common voltage, Lt; / RTI >

The lower polarizing member 115 is attached to the lower surface of the lower substrate 111 to polarize light incident from the light source module to a first polarization axis and irradiate the lower substrate 111.

The upper polarizing member 117 is attached to the upper surface of the upper substrate 113 to polarize light emitted to the outside through the upper substrate 113. The upper polarizing member 117 is attached to the upper surface of the upper substrate 113 to polarize the color light transmitted through the upper substrate 113 and emitted to the outside to a second polarizing axis different from the first polarizing axis Lt; / RTI > The upper polarizing member 117 according to another example separates the polarizing film and the three-dimensional image attached to the upper surface of the polarizing film and displayed on the display panel 110, i.e., the left eye image and the right eye image into different polarization states And a retarder film (not shown).

The display panel 110 displays a predetermined color image according to light transmitted through the liquid crystal layer by driving the liquid crystal layer according to an electric field formed for each pixel by a data voltage and a common voltage applied to each pixel .

The light guide plate 120 advances the light emitted from the light source module toward the rear side of the display panel 110. The light guide plate 120 has a rectangular shape when viewed from the front, and has a rectangular parallelepiped structure including six surfaces when viewed three-dimensionally. Accordingly, when the respective surfaces of the light guide plate 120 are defined, the light exit surface 121, the lower surface 122, and the light incident surface 123, an incident light surface 124 opposed to the light incidence surface, and a first side surface 125 and a second side surface 126 connecting the light incidence surface 123 and the non-light incidence surface 124.

The light incidence surface 124 of the light guide plate 120 includes a protrusion, which is composed of an upper protrusion 124a and a lower protrusion 124b. The protruding structure of the light guide plate 120 can replace the function of the conventional guide panel.

That is, the protruding portions 124a and 124b may serve to fix various sheets including the reflection plate 130 so that they can be disposed at appropriate positions. When an external force is applied to the display device, various sheets including the reflection plate 130 are fixed so as not to deviate from the predetermined position, thereby preventing optical defects and the like of the display device.

A transparent tape is disposed on the optical sheets 140 positioned on the upper surface of the upper protrusion 124a instead of the structure in which the protrusions 124a and 124b are attached to the display panel 110 through the conventional guide panel. It is possible to secure a space to be attached to the panel. However, the light shielding function, which is one of the functions of the conventional guide panel, can not be performed by the light guide plate 120, but can complement the light shielding function for preventing light leakage or the like through the light shielding film 160 to be described later.

The reflection plate 130 is disposed on the lower surface 122 of the light guide plate 120 to reflect light incident from the light guide plate 120 toward the light guide plate 120, Lt; RTI ID = 0.0 > loss < / RTI >

The optical sheets 140 are disposed on the light guide plate 120 to improve the brightness characteristics of light emitted from the light guide plate 120. For example, the optical sheets 140 may include a diffusion sheet, a prism sheet, and a dual brightness en- hancement film, but the present invention is not limited thereto. For example, a diffusion sheet, a prism sheet, A dual brightness en- hancement film, and a lenticular sheet. The optical sheets 140 will be described later with reference to FIGS.

The light emitting diode printed circuit board 150 may include a light emitting diode package 152, a light emitting diode chip 153 and an encapsulating layer 154. The light emitting diode printed circuit board 150 may include a light emitting diode And supplies it to the diode chip 153. The light emitting diode printed circuit board 150 may be a flexible printed circuit board. In the present invention, the light emitting diode printed circuit board 150 is a flexible printed circuit board . The light emitting diode printed circuit board 150, the light emitting diode package 152, the light emitting diode chip 153 and the sealing layer 154 are defined as a light source module. The light emitting diode printed circuit board 150 will be described later with reference to FIGS. 6 and 7. FIG.

The light shielding film 160 may be disposed on the uppermost sheet back surface of the optical sheet 140 to be described later and may be provided to surround the optical sheet 140 and the LED printed circuit board 150. At this time, the light shielding film 160 is not disposed on the back surface of the optical sheet 140 which overlaps with the display area where the image is realized.

The light shielding film 160 absorbs light incident from the periphery to prevent light leakage. Further, the light shielding film 160 serves to fix the optical sheet 140. That is, the light shielding function of the present invention, which is one of the functions of the conventional guide panel, is replaced by the light shielding film 160 of the present invention, so that light leaked from the side of the light guide plate 120 is shielded to minimize light loss.

The light shielding film 160 according to an exemplary embodiment includes a light shielding film 160 disposed on the light incident surface 121 of the light guide plate and a light shielding film 160 disposed on the light incident surface 124 of the light guide plate 120, May have different sizes. Since the light guide film 160 disposed on the light incidence surface 124 of the light guide plate 120 is removed from the light guide plate 120, the light guide phenomenon occurs in which the light paths are separated from the protrusions 124a and 124b of the light guide plate 120 . The light shielding film 160 disposed on the light incidence surface 124 of the light guide plate 120 may be disposed to surround a part of the lower surface 122 of the light guide plate 120. [

On the other hand, since the light-emitting diode printed circuit board 150 covers the lower surface 122 of the light guide plate, the light-shielding film 160 disposed on the light-incoming surface 123 of the light guide plate 120 may cause light leakage There is no. The light shielding film 160 disposed on the light incidence surface 123 of the light guide plate 120 is formed so that the light incidence surface 123 of the optical sheets 140 and the light guide plate 120 and the light emitting diode package 152 overlap each other May be arranged to surround a part of the area.

Similarly, the light shielding film 160 may be disposed on the first and second side surfaces 125 and 127 of the light guide plate 120 to prevent light leakage.

FIG. 4 is a perspective view showing an optical sheet according to the present invention, and FIG. 5 is a perspective view showing a folded structure of the optical sheet shown in FIG.

Referring to FIG. 4, the optical sheets 140 may include a plurality of optical sheets 140, and the optical sheets 140 may include three optical sheets. For example, a third optical sheet 145 disposed on the upper surface of the light guide plate 120, a second optical sheet 143 disposed on the upper surface of the third optical sheet, a second optical sheet 143 disposed on the second optical sheet 143, And the first optical sheet 141 constituting the second optical sheet.

The first optical sheet 141 may be any one selected from a diffusion sheet, a prism sheet, a dual brightness enhancement film, and a lenticular sheet.

When the first optical sheet 141 is folded along the dotted line, the first optical sheet 141 is folded along the first bent region 141a facing the light emitting surface 121 of the light guide plate 120 and the lower surface 122 of the light guide plate, The second bending region 141b that faces the first side surface 125 and the second side surface 126 of the light guide plate faces the light incidence surface 123 and the light incidence surface 124 of the light guide plate, And a fourth bent region 141d. However, the optical sheet 140 including the first through fourth bending regions 141a through 141d is not limited to the first optical sheet 141 which is the uppermost sheet. For example, according to one embodiment of the present invention, a second optical sheet 143 disposed between the first optical sheet 141 and the third optical sheet 145 is disposed between the first through fourth bending areas 141a, And 141d. In this case, the above-described light shielding film 160 may be disposed on the back surface of the second optical sheet 143.

The second bent region 141b may have a trapezoidal shape that is cut at a certain angle as shown in the figure in order to prevent overlap with the adjacent second bent region 141b. An adhesive member such as a transparent tape may be disposed on the upper surface of the first bending region 141a and attached to the display panel 110. [

Referring to FIG. 5, the first optical sheet 141 according to the present invention may have a 'C' -shaped structure extending from the first bending region 141a to the second bending region 141b. Such a structure can replace the role of a conventional guide panel. That is, the first optical sheet 141 is disposed so as to surround the entire backlight unit including the second and third optical sheets 143 and 145, and can replace the conventional guide panel for housing the backlight unit.

Since the thickness of the guide panel can be reduced by using the first optical sheet 141 according to the present invention, it is possible to reduce the thickness of the conventional guide panel, thereby realizing a narrow bezel. Further, by deleting the guide panel, an effect of simplifying the assembling process can be obtained, and it is possible to reduce the cost of parts and lighten the display device.

FIG. 6 is a cross-sectional view showing the light-entering surface of the display device according to the present invention, and FIG. 7 is a cross-sectional view showing the non-light-entering surface of the display device according to the present invention. In order to avoid duplication, the description of FIG. 3 will be omitted.

Referring to FIG. 6, the LED printed circuit board 150 includes a first region 151 in which the LED package 152 is mounted, and a second region 151 in which the first region 151 is overlapped with the first region 151. And a banding region 156 connecting one side of each of the first region 151 and the second region 155 and one side of each of the first region 151 and the second region 155 May be provided to overlap with the light emitting diode package.

That is, the light emitting diode printed circuit board 150 is folded in the direction of the first area 151 by bending the area corresponding to the second area 155. The second region 155 may be folded and then folded and attached to the back surface of the first region 151. For this purpose, the first and second regions 151 and 155 may be provided with an adhesive tape. The first optical sheet 141 may be disposed to cover the second region 155.

The banding area 156 may be filled with banding ink after the coverlay is removed. Although not shown in the drawings, the light emitting diode printed circuit board 150 may have a groove in which the coverlay is removed in the banding region 156. The groove may be filled with bending ink. The bending ink may be composed of an acrylic resin or an epoxy-based acrylic resin.

The length of the second area 155 and the length of the first area 151 of the LED printed circuit board 150 may be different, but are not limited thereto. For example, the length of the second region 155 may be longer than the length of the first region 151. In this case, the reflection plate 130 may be attached to the second region 155. In this case, the reflection plate 130 may be attached to the second region 155.

For example, the lengths of the first and second regions 151 and 156 may be the same. In this case, the reflection plate 130 may be attached to the first region 151.

When the light emitting diode printed circuit board 150 includes the first and second regions 151 and 155 and the second region 155 is bent and folded, The area of the light emitting diode printed circuit board 150 disposed outside the bezel is designed to be close to zero so that the width of the bezel area can be greatly reduced. In addition, when the first optical sheet 151 according to the present invention is used, the width of the bezel area can be further reduced because the guide panel is removed as described above.

The light emitting diode chip 153 is mounted on the light emitting diode package 152. Although not shown in the drawing, the light emitting diode packages 152 may include first and second lead electrodes spaced apart from each other at regular intervals, a mold frame provided at an edge portion of the first and second lead electrodes to define a light emitting space, A light emitting diode chip 153 bonded to the first lead electrode and / or the second lead electrode and disposed in the light emitting space, and a first terminal provided on one side of the upper surface of the light emitting diode chip 153 to the first lead electrode And a second wire connecting the second terminal provided on the other side of the upper surface of the light emitting diode chip 153 to the second lead electrode.

The light emitting diode chip 153 may be an Epi chip that emits light, for example, a blue epi chip that emits blue light.

The encapsulation layer 154 may include an encapsulation layer 154 filled in the light emitting space to cover the light emitting diode chip 153 and the first and second wires. The sealing layer may be formed to include the phosphor 154a (Phosphor).

The connector 157 is formed at an end of an extension extending from the light emitting diode printed circuit board 150 to receive a light source driving signal from the outside.

8 is a perspective view showing an optical sheet according to a second embodiment of the present invention. The second embodiment of the present invention is only partially modified with respect to the first optical sheet 141 of the first embodiment described above, and a description of the overlapped portions will be omitted.

 The display device 100 according to the second embodiment of the present invention may include the fourth optical sheet 146 instead of the first optical sheet 141 of the first embodiment described above.

8, the fourth optical sheet 146 includes a fifth bent region 146a facing the light outputting face 121 of the light guide plate 120, a sixth bent region 146a facing the lower face 122 of the light guide plate, A seventh bent region 146c facing the light incidence surface 123 and the non-light incidence surface 124 of the light guide plate and an eighth bent region 146c facing the first side surface 125 and the second side surface 126 of the light guide plate, (146d).

The sixth bent region 146b may have a trapezoidal shape whose ends are cut at a certain angle as shown in the figure in order to prevent overlap with another adjacent sixth bent region 146b.

The fourth optical sheet 146 may be any one selected from a diffusion sheet, a prism sheet, a dual brightness enhancement film, and a lenticular sheet.

A light shielding material 165 may be coated on the back surface of the fourth optical sheet. That is, the light shielding material 165 may be coated directly on the back surface of the fourth optical sheet 146 instead of the light shielding film 160 of the first embodiment. The light-shielding material 165 coated in this manner is a part of the light-exiting surface 121 of the light guide plate 120, a part of the lower surface 122, the light incidence surface 123, the non-light incidence surface 124, the first side surface 125, Two side surfaces 126 of the second substrate. In other words, the light-shielding material 165 according to the second embodiment of the present invention, except for a part of the back surface of the fifth bending area 146a overlapping with the display area in which the image is implemented, as in the light-shielding film 160 of the first embodiment And may be coated on the back surface of the fourth optical sheet 146. The fourth optical sheet 146 coated with the light shielding material 165 can prevent light leakage of the light guide plate 120 and improve light efficiency.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those precise embodiments and various changes and modifications may be made without departing from the scope of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100: display device 110: display panel
120: a light guide plate 130:
140: optical sheets 141: first optical sheet
142: second optical sheet 143: third optical sheet
144: fourth optical sheet 145: fifth optical sheet
146: sixth optical sheet 150: light emitting diode printed circuit board
151: first region 155: second region
160: Shading film 165: Shading material

Claims (9)

Optical sheets comprising at least two or more sheets;
A light guide plate disposed on a lower surface of the optical sheet;
A reflection plate disposed on the lower surface of the light guide plate; And
And a light source module that emits light to the light guide plate,
Wherein the light guide plate has a light emitting surface in contact with the optical sheet, a bottom surface in contact with the reflection plate, and a light incidence surface connecting the light emitting surface and the bottom surface,
Wherein one of the optical sheets is disposed so as to cover the light exit surface, the bottom surface, and the light incidence surface of the light guide plate. The method according to claim 1,
The light incident on the light guide plate is incident on the light source module,
Wherein the light guide plate further includes an incident light surface facing the light incidence surface. The method according to claim 1,
The light source module includes:
A light emitting diode package for emitting light, and a printed circuit board on which the light emitting diode package is mounted. The method of claim 3,
The printed circuit board
A first region in which the light emitting diode package is mounted;
A second region folded to overlap the first region; And
And a banding region connecting one side of each of the first region and the second region;
And one side of each of the first region and the second region overlaps the light emitting diode package. The method according to claim 1,
Further comprising a light shielding film on a back surface of the optical sheet arranged to cover the light emitting surface, the lower surface, and the light incidence surface of the light guide plate. The method according to claim 1,
Wherein a light shielding material is coated on a rear surface of the optical sheet arranged to cover the light emitting surface, the bottom surface, and the light incidence surface of the light guide plate. 3. The method of claim 2,
Wherein the light guide plate further comprises a protrusion on the light incidence surface opposite to the light incidence surface of the light guide plate. 8. The method of claim 7,
Wherein the protrusions support the optical sheets and include an upper protrusion and a lower protrusion, Display panel; And
And a backlight unit for providing light to the display panel,
Wherein the backlight unit is the backlight unit according to any one of claims 1 to 8.

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