KR101686048B1 - Light guide plate and backlight unit including the same - Google Patents

Abstract

In the light guiding plate and the backlight unit including the light guiding plate, the light guiding plate includes a light incident portion for receiving light, a light emitting portion for emitting the light incident to the light entering portion to the outside and a light emitting portion facing the light emitting portion, A light guiding part facing the light guiding part and a light entering part and facing the light entering part and returning light received from at least one of the light entering part, the light guiding part and the light exiting part to the light entering part, the light guiding part, And a plurality of light reflection patterns for reflecting the light toward at least one of the plurality of light reflection patterns.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light guide plate and a backlight unit including the light guide plate.

The present invention relates to a light guide plate and a backlight assembly including the same, and more particularly, to a light guide plate for a liquid crystal display and a backlight assembly including the same.

BACKGROUND ART [0002] A liquid crystal display device is widely used together with a PDP, an organic light emitting display device, and the like. Research and product development for improving display quality have been actively conducted in this regard.

In a liquid crystal display, a liquid crystal can not emit light itself, and therefore, a separately provided light is required, and a backlight unit disposed under the liquid crystal display panel serves as a light source. In the case of an edge type, light emitted from a light source disposed on a side surface of the liquid crystal display device is changed in light path by the light guide plate, and liquid crystal display And is emitted toward the panel so that the liquid crystal display panel is provided with light.

The intensity of light incident perpendicularly to the incident surface of the light guide plate is strongest and the light incident perpendicularly to the incident surface passes through the incident surface and then exits to the outside through the corresponding light portion, .

In order to minimize such a light loss, the white reflection process is performed on the mold frame facing the large light portion of the light guide plate. However, the reflectance due to the white reflection process is 80% or less.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light guide plate that minimizes light loss through a light-shielding portion.

Another object of the present invention is to provide a backlight unit including the light guide plate.

According to an embodiment of the present invention, there is provided a light guide plate including a light incident portion to which light is incident, a light emitting portion that exits the light incident to the light entering portion to the outside, a light emitting portion that faces the light emitting portion, And at least one of the light-entering portion, the light-guiding portion, and the light-outgoing portion, and the light guide portion facing the light-entering portion and guiding the light received from at least one of the light- And a plurality of light reflection patterns for reflecting the light toward the plurality of light reflection patterns.

In one embodiment, the light reflection patterns are arranged in a matrix shape, and each of the light reflection patterns may have a polygonal pyramid shape, a polygonal pyramid shape in which apexes are chamfered, or a convex lens shape.

In one embodiment, each of the light reflection patterns may have the shape of a square horn having a vertex angle of 40-110..

In one embodiment, each of the light reflection patterns may have a convex lens shape with a radius of 3 [mu] m to 15 [mu] m.

In one embodiment, each of the light reflection patterns may have a prism shape, a prism shape in which apexes are chamfered, or a lenticular shape.

In one embodiment, each of the light reflection patterns may have a prism shape with a vertex angle of 70-110 [mu] m.

In one embodiment, each of the light reflection patterns may extend in the same direction as the longitudinal direction of the edge connecting the light emitting portion and the light-shielding portion, and may be arranged parallel to each other in a direction perpendicular to the longitudinal direction of the edge .

In one embodiment, each of the light reflection patterns may extend along a direction perpendicular to the longitudinal direction of the edge connecting the light emitting portion and the light-shielding portion, and may be arranged parallel to each other in the longitudinal direction of the edge.

In one embodiment, the light-incident portion includes a plurality of light incidence patterns extending along a direction perpendicular to a longitudinal direction of corners connecting the light-exiting portion and the light-entering portion, and arranged in parallel with each other in the longitudinal direction of the corners can do.

A backlight unit for another purpose of the present invention includes a light source, a light incident portion facing the light source, a light emitting portion for emitting light emitted from the light source, a light emitting portion for emitting light incident to the light entering portion, A light guiding unit for guiding the light incident on the light incidence unit to be provided to the light exiting unit, and a light guiding unit for guiding the light received from at least one of the light entering unit, the light guiding unit, A light guide plate including a light-shielding portion including a plurality of light reflection patterns reflecting the light toward at least one of the light portion, the light guide portion, and the light-emitting portion, and at least one optical sheet disposed on the light-

In one embodiment, each of the light reflection patterns may have a polygonal pyramid shape, a polygonal pyramid shape with a chamfered apex, a convex lens shape, a prism shape, a prism shape with a chamfered apex, or a lenticular shape.

In one embodiment, the light incident pattern may include a plurality of light incident patterns extending along a direction perpendicular to the longitudinal direction of the edge connecting the light emitter and the light ember, and arranged in parallel with each other in the longitudinal direction.

According to the light guide plate and the backlight unit including the light guide plate of the present invention, the amount of light lost in the large light portion can be minimized, and the utilization efficiency of light generated by the light source can be improved.

1 is a cross-sectional view illustrating a liquid crystal display device having a backlight unit including a light guide plate according to an embodiment of the present invention.
2 is a partial cross-sectional view illustrating a structure of a light guide plate according to the present invention.
3 is a partially enlarged perspective view for explaining one structure of the light shielding portion of FIG.
4A is a partially enlarged perspective view for explaining another structure of the light-shielding portion of FIG.
4B is a partially enlarged perspective view for explaining another structure of the light guide plate according to the present invention.
5 is a partial cross-sectional view illustrating another structure of a light guide plate according to the present invention.
FIGS. 6A and 6B are perspective views illustrating a structure of a light reflection pattern included in the light-focusing portion of FIG.
7 is a view for explaining a structure of a light reflection pattern included in the light-shielding portion of the light guide plate according to the present invention.
8 is a perspective view of a light guide plate for explaining another structure of a light guide plate according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "having ", etc. is intended to specify that there is a feature, step, operation, element, part or combination thereof described in the specification, , &Quot; an ", " an ", " an "

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a cross-sectional view illustrating a liquid crystal display device having a backlight unit including a light guide plate according to an embodiment of the present invention.

Referring to FIG. 1, a liquid crystal display (DPA) includes a liquid crystal display panel (PA) and a backlight unit disposed below the liquid crystal display panel (PA). The backlight unit may include a light source 100, a light guide plate 200, and optical sheets 320, 330, and 340, and may further include a reflection plate 310.

The light source 100 is disposed on one side of the liquid crystal display (DPA), and the light source 100 emits light to provide light to the light guide plate 200. The light source 100 may be an LED.

The light guide plate 200 receives light from the light source 100 and guides the received light to the liquid crystal display panel PA. The light guide plate includes a light entering portion 210, a light emitting portion 220, an emitting portion 230, and a light guide portion 240 through which light from the light source 100 is incident. The light incident on the light-incident portion 210 is changed in path through the light guide portion 240 and is emitted to the light-emitting portion 230. A light guide pattern of a lens type is formed in the light guide part 240 so that the light path can be changed. The light entering portion 210 and the light emitting portion 220 face each other and the light emitting portion 230 and the light guide portion 240 face each other. The structure of the light-focusing portion 220 will be described later with reference to FIG. 2 to FIG.

The reflection plate 310 is disposed at the lower end of the light guide plate 200 so as to face the light guide unit 240 of the light guide plate 200. The reflection plate 310 reflects light leaking from the light guide part 240 to the inside of the light guide plate 200, thereby improving utilization efficiency of light.

The optical sheets 320, 330 and 340 are disposed on the light guide plate 200 and diffuse and / or collect light emitted from the light guide plate 200 to provide the light to the liquid crystal display panel PA. The optical sheets 320, 330, and 340 may include a diffusion sheet, a prism sheet, and the like. For example, the diffusion sheet 320, the first prism sheet 320, and the second prism sheet 330 may be sequentially disposed on the light guide plate 200.

2 is a partial cross-sectional view illustrating a structure of a light guide plate according to the present invention.

Referring to FIG. 2, the light-focusing portion 220 includes a plurality of light reflection patterns UN. The light reflection pattern UN reflects the light provided from the light input portion 210 and the light guide portion 240 back to the inside of the light guide plate 200. Accordingly, the light leaking out of the light blocking part 220 to the outside can be minimized, and the utilization efficiency of light can be improved. That is, light passing through the light-directing unit 210 or light passing through the light-guiding unit 240 and the light-emitting unit 230 may be provided to the light-directing unit 220 and may be provided to the light- The light is reflected by the light entering portion 210 or reflected by the light guide portion 240 and the light emitting portion 230 to maximize the amount of light emitted to the light emitting portion 230.

The light reflection pattern UN may include a first region for reflecting light incident in a first direction in a second direction and a second region for reflecting the light reflected in the first region in a third direction . In this case, the first direction and the third direction may be opposite to each other, and the second direction may be perpendicular to each of the first and second directions. The light reflection pattern UN may be arranged in a line along the direction intersecting the longitudinal direction of the edge connecting the light emitting unit 230 and the light emitting unit 220.

The apex angle of the light reflection pattern UN may be 40 [deg.] To 110 [deg.]. In this case, the vertex angle means an angle of a vertex formed by each inclined face of the light reflection pattern UN in a cross section perpendicular to the longitudinal direction of the corner connecting the light emitting portion 230 and the light exiting portion 220.

 For example, the light reflection pattern UN has a triangular cross-sectional shape cut along the light-incident portion 210 and the light-facing portion 200 so as to include both the light source 100 and the light guide plate 200, The sides may correspond to the first region and the second region, respectively. The structure of the light reflection pattern UN having a triangular section is specifically described with reference to Figs. 3, 4A and 4B.

3 is a partially enlarged perspective view for explaining one structure of the light shielding portion of FIG.

Referring to FIG. 3, the light reflection pattern UN may have the shape of a square pyramid in three dimensions. At this time, the light reflection patterns UN may be arranged in a matrix form.

When the light reflection pattern UN is in the shape of a square horn, the reflection efficiency can be high within a range of the apex angle of 40 DEG to 110 DEG. Preferably, the apex angle may be between 70 [deg.] And 110 [deg.].

4A is a partially enlarged perspective view for explaining another structure of the light-shielding portion of FIG.

Referring to FIG. 4A, the light reflection pattern UN may have a prism shape in three dimensions. At this time, the light reflection pattern UN may extend along the longitudinal direction of the edge connecting the light emitting unit 230 and the light emitting unit 220, and may be arranged in a row along a direction perpendicular to the longitudinal direction.

When the light reflecting pattern UN has a prism shape extending in the longitudinal direction of the corner connecting the light emitting portion 230 and the light emitting portion 220 described in FIG. 4A, The reflection efficiency can be high. Preferably, the apex angle may be between 80 ° and 100 °.

4B is a partially enlarged perspective view illustrating a structure of a light guide plate according to the present invention.

The light guide plate shown in Fig. 4B is substantially the same as that described in Fig. 1 and Fig. 4A except for the structure of the light-focusing portion 220. Fig. Therefore, redundant detailed description will be omitted.

Referring to FIG. 4B together with FIG. 1, the light reflection pattern UN constituting the light projection part 220 of the light guide plate has a prism shape in three dimensions, and the light reflection pattern UN includes a light emission part 230, And may extend along a direction perpendicular to the longitudinal direction of the edge connecting the first end portion 220 and the second end portion. At this time, the light reflection patterns UN may be arranged in a line along the direction crossing the extending direction.

When the light reflecting pattern UN has a prism shape extending in a direction perpendicular to the longitudinal direction of the edge connecting the light emitting portion 230 and the light emitting portion 220 described in FIG. 4B, the vertex angle is 40 to 110 The reflection efficiency can be high. Preferably, the apex angle may be between 80 ° and 100 °.

5 is a partial cross-sectional view illustrating another structure of a light guide plate according to the present invention.

1, a light reflection pattern UN included in the light-blocking part 220 of the light guide plate 200 of FIG. 1 is formed by a light-incident part 210 (see FIG. 1) so as to include both the light source 100 and the light- And the light-exiting portion 200 may have a semi-circular cross-sectional shape. The structure of the light reflection pattern UN having a semicircular cross section will be described in detail with reference to Figs. 6A and 6B.

FIGS. 6A and 6B are perspective views illustrating a structure of a light reflection pattern included in the light-focusing portion of FIG.

Referring to FIG. 6A together with FIG. 5, the light reflection pattern UN may have a convex lens shape in three dimensions. At this time, the light reflection pattern UN may be arranged in a matrix form in the light- For example, the light reflection pattern (UN) may be hemispherical in height and radius. The height means the distance between the apexes of the convex lens part from the bottom surface of the convex lens, and the radius is defined with respect to the bottom surface of the circle. The light reflection pattern UN may be of a convex lens type having a different height and radius, and the radius may be larger than the height. For example, the radius of the light reflection pattern UN may be 3 [mu] m to 15 [mu] m. For example, the light reflection pattern UN may have a height of 5 [mu] m and a radius of 5 [mu] m to 15 [mu] m.

Referring to FIG. 6B together with FIG. 5, the light reflection pattern UN may have a lenticular shape in three dimensions. At this time, the light reflection pattern UN may extend along the extending direction of the edge connecting the light emitting unit 230 and the light emitting unit 220, and may be arranged in a line along the direction intersecting the extending direction.

Although not shown in the drawing, the light reflection pattern UN constituting the light projection part 220 of the light guide plate has a three-dimensional lenticular shape, and the light reflection pattern UN has a structure in which the light output part 230 and the light- And may extend along a direction perpendicular to the longitudinal direction of the connecting edge. At this time, the light reflection patterns UN may be arranged in a line along the direction crossing the extending direction.

7 is a view for explaining a structure of a light reflection pattern included in the light-shielding portion of the light guide plate according to the present invention.

Referring to FIG. 7 together with FIG. 1, the light reflection pattern included in the light-shielding portion 220 of the light guide plate 200 may have a triangular pyramid such as a quadrangular pyramid chamfered as shown in FIG. They may be arranged in a matrix form in the light-

In the above description, only the triangular pyramid and the quadrangular pyramid or its chamfered shape are described, but the light reflection pattern may have a polygonal pyramid shape, and the apex of the triangular pyramid as shown in (b) may have a chamfered shape.

4A and 4B, and the light-shielding portion 220 of the light guide plate 200 may include a light reflection pattern having a chamfered prism shape.

8 is a perspective view of a light guide plate for explaining another structure of a light guide plate according to the present invention.

The light guide plate shown in Fig. 8 is substantially the same as that described in Fig. 4B except for the structure of the light-incident portion 210. Fig. Therefore, redundant detailed description will be omitted.

Referring to FIG. 8 together with FIGS. 1 and 4B, the light reflecting pattern UN of the light-exiting portion 220 is three-dimensionally arranged in a direction perpendicular to the longitudinal direction of the corner connecting the light- And the light-incident portion 210 includes a light incidence pattern CP.

For example, the light incident pattern CP has a prism shape protruding toward the light source 100, and the light incident pattern CP has a three-dimensional shape, that is, a corner connecting the light emitter 230 and the light emitter 210 And a prism shape extending in a direction perpendicular to the longitudinal direction of the light guide plate. That is, in FIG. 8, the light incident pattern CP may have substantially the same shape as the light reflection pattern UN. Alternatively, the light incidence pattern CP may have a prism shape in which apexes are chamfered.

Alternatively, the light incident pattern CP may have a lenticular structure including lenticular lenses extending in a direction perpendicular to the longitudinal direction of a corner connecting the light emitting unit 230 and the light entering unit 210. Each of the lenticular lenses has a structure substantially similar to that shown in FIG. 6B. The extending direction of the lenticular lenses is a direction perpendicular to the longitudinal direction of a corner connecting the light emitting unit 230 and the light entering unit 210, The light incident pattern CP can be formed by being arranged in a row in the longitudinal direction of the edge connecting the light emitting unit 230 and the light entering unit 210.

The light incidence pattern CP may include diffusion particles dispersed therein to increase the degree of diffusion of light.

The light incident pattern CP has a prism shape or a lenticular shape in which a vertex is chamfered or a prism shape extending in a direction perpendicular to the longitudinal direction of a corner connecting the light emitting portion 230 and the light entering portion 210, The pattern CP spreads the incident light emitted from the light source 100 to emit the light from the light source 100 to the dark region where the brightness is relatively low between the light sources 100, It is possible to transmit the emitted light.

The light incident pattern CP can uniformly enter the light emitted from the light source 100 into the light guide plate 200. It is difficult to diffuse the light into the spacing region when the light incident pattern extending in the longitudinal direction of the edge connecting the light emitting unit 230 and the light emitting unit 210 is formed, The light guide plate 200 does not have an effect of being incident into the light guide plate 200. Accordingly, the light incident pattern CP has a prism shape, a prism shape in which apexes are chamfered, or a lenticular shape. The extending direction of the light incident pattern CP is perpendicular to the longitudinal direction of a corner connecting the light emitting portion 230 and the light entering portion 210 A light source 100 such as an LED is configured such that a plurality of light sources 100 are spaced apart from each other in a longitudinal direction of a corner connecting the light emitting unit 230 and the light emitting unit 210. In this case, (100) may be configured to face a plurality of prisms of a light incidence pattern (CP), a prism with a vertex chamfered, or a lenticular lens. At this time, the light-incident portion 210 facing the spacing region between the light source 100 and the light source 100 may be a flat surface on which the light incidence pattern CP is not formed.

Unlike the case where the light incidence pattern CP is continuously arranged in the light incident portion 210 as shown in FIG. 8, the light incident portion 210 has a region where the light incident pattern CP is formed, The light reflection pattern UN may be formed in a prism shape extending in a direction perpendicular to the longitudinal direction of the corner connecting the light emitting unit 230 and the light emitting unit 220 The light incident pattern CP may be formed by a prism shape extending in a direction perpendicular to the longitudinal direction of a corner connecting the light emitting unit 230 and the light incident unit 210, The light reflection pattern UN may be provided with the light guide plate having the structure described in Figs. 3, 4A, 5, 6A, 6, and 7, while having the shape or the lenticular shape.

Hereinafter, an experiment in which a change in luminance according to a light reflection pattern of a light-shielding portion is measured, and a result thereof will be described.

Experiment 1 and evaluation

The light reflection pattern was prepared by providing a light guiding plate designed to have a square shape with a square bottom and a square side with a length of 20 μm and a vertex angle of 40 °. A diffusion sheet was laminated on the light- Two sheets of prism sheets were stacked on top of the sheet, and an average luminance of 9 points was measured using Topcon SR3-AR luminance measuring equipment. The luminance was converted (unit%) at a luminance of 100% for a light guide plate having no light reflection pattern.

The light reflection pattern was designed to increase the vertex angle from 40 ° to 170 ° by 10 °, and the luminance was measured. The luminance of the light guide plate without light reflection pattern was converted to 100% (unit%).

Also, the light guide plates were manufactured by designing the light reflection pattern while increasing the vertex angle from 40 ° to 170 ° in 10 ° increments with the prism shape. The luminance was measured for each light guide plate, and the luminance of the light guide plate without light reflection pattern was converted to 100% (unit%).

The results are shown in Table 1 below.

Vertex angle In a light reflection pattern having a square-horn-like shape,
Luminance Prismatic
In the light reflection pattern
Luminance Light guide plate without light reflection pattern 100.0% 100.0% 40˚ 101.0% 100.6% 50˚ 101.3% 100.7%  60˚ 101.6% 100.9% 70˚ 102.0% 101.8% 80˚ 102.4% 102.2% 90˚ 102.4% 102.1% 100˚ 102.2% 102.1% 110˚ 101.3% 101.4% 120˚ 100.8% 100.9% 130˚ 100.5% 100.5% 140˚ 100.4% 100.4% 150˚ 100.2% 100.3% 160˚ 100.2% 100.1% 170˚ 100.1% 100.2%

Referring to Table 1, it can be seen that a light guide plate to which a light reflection pattern with a square horn shape or a prism shape is applied has a luminance higher than that of the light guide plate without a light reflection pattern when the luminance is 100%. That is, it can be seen that the optical loss is reduced.

Particularly, when the light reflection pattern has a square-pyramid shape, it can be seen that the peak angle has a value of 101% or more at 40 ° to 110 ° and at least 102.0% at 70 ° to 100 °. When the light reflection pattern has a prism shape, it can be seen that the peak angle has a value of 101% or more at 70 ° to 110 °, and at least 102.1% at 80 ° to 100 °.

It can be seen that the light loss can be further reduced in the case of a quadrangular pyramid rather than a prism.

Experiment 2 and evaluation

The light reflection pattern was designed to be a hemispherical convex lens type having a height of 5 占 퐉, and the radius was increased from 5 占 퐉 to 5 占 퐉. A light guiding plate including the light guiding plate was prepared and the luminance thereof was measured. The luminance of the light guide plate without the light reflection pattern was converted to 100% (unit%). The results are shown in Table 2 below.

radius Luminance Light guide plate without light reflection pattern 100.0% 5 탆 102.0% 10 탆 101.4% 15 탆 101.2% 20 탆 100.8% 25 탆 100.7% 30 탆 100.6% 35 탆 100.6%

Referring to Table 2, it can be seen that the light guide plate to which the light reflection pattern is applied exhibits higher luminance when the luminance of the light guide plate without the light reflection pattern is 100%. That is, it can be seen that the optical loss is reduced.

It can be seen that the luminance in the case where the radius is 5 占 퐉 to 15 占 퐉 is higher than that in the other cases. Particularly, when the radius is the same as the height of the light reflection pattern, that is, the hemispherical convex lens having a radius of 5 占 퐉 It can be seen that the luminance of the light guide plate having the light reflection pattern of the highest level is the highest.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.

DPA: liquid crystal display device PA: liquid crystal display panel
100: light source 200: light guide plate
210: light input section 220: large light section
230: light emitting portion 240: light guide portion
UN: light reflection pattern

Claims (12)

A light-incident portion on which light is incident;
A light emitting unit for emitting the light incident on the light-entering unit to the outside;
A light guide part facing the light emitting part and guiding the light incident on the light entering part to be provided to the light emitting part; And
A plurality of light reflection patterns for reflecting the light received from at least one of the light input section, the light guide section, and the light output section toward at least one of the light input section, the light guide section, and the light output section, And a light-shielding portion,
Wherein each of the light reflection patterns has a hemispherical convex lens shape,
The hemispherical convex lens-shaped light reflection patterns are arranged in a matrix form in the light-
Characterized in that the radius of the hemispherical convex lens shape is 5 占 퐉 to 15 占 퐉.
Light guide plate.
The method according to claim 1,
The light-
And a plurality of light incidence patterns extending along a direction perpendicular to the longitudinal direction of the corners connecting the emitter and the light emitter and arranged parallel to each other in the longitudinal direction of the corners.
Light guide plate.
Light source;
A light emitter for emitting light emitted from the light source facing the light source; a light emitter for emitting light incident to the light emitter to the outside; a light emitter for emitting light incident to the light emitter, And at least one of the light-entering portion, the light-guiding portion, and the light-outgoing portion, and the light guide portion facing the light-entering portion and guiding the light received from at least one of the light- A light guide plate including a light-shielding portion including a plurality of light reflection patterns reflecting light toward the light guide plate; And
And at least one optical sheet disposed on a light emitting portion of the light guide plate,
Wherein each of the light reflection patterns formed on the light-shielding portion of the light guide plate has a hemispherical convex lens shape,
The hemispherical convex lens-shaped light reflection patterns are arranged in a matrix form in the light-
Characterized in that the radius of the hemispherical convex lens shape is 5 占 퐉 to 15 占 퐉.
Backlight unit.
The method of claim 3,
The light-
And a plurality of light incidence patterns extending along a direction perpendicular to the longitudinal direction of the corners connecting the emitter and the light emitter and arranged parallel to each other in the longitudinal direction.
Backlight unit. delete delete delete delete delete delete delete delete

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