Backlight unit and display device including the same

Abstract

Disclosed are a backlight unit and a display device including the backlight unit. The display device includes: a light guide plate; an optical sheet arranged on an upper surface of the light guide plate; a reflector configured to accommodate the light guide plate and the optical sheet; and a bottom cover configured to accommodate the reflector.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2019-0179340, filed on Dec. 31, 2019, which is hereby incorporated by reference as if fully set forth herein. Technical Field

[0002] The present invention relates to a backlight unit and a display device including the backlight unit, and more particularly, to a backlight unit in which a light guide plate and an optical sheet are located in a bottom cover and a display device including the backlight unit. Background Art

[0003] With the advent of the information age, the field of displays for visually displaying electrical information signals has rapidly developed, and in order to meet this development, various display devices having excellent properties such as thinness, light weight, and low power consumption are being developed.

[0004] As examples of such a display device, there are a liquid crystal display (LCD) device, an organic light emitting diode (OLED) display device, a quantum dot display device, and the like.

[0005] Among them, self-luminous display devices such as organic light emitting diode (OLED) display devices are considered to be competitive applications, which do not require a separate light source and achieve compact and clear color display. The OLED display device includes a self-luminous diode arranged in each pixel to emit light, and the light-emitting diode includes two electrodes opposite to each other and a light-emitting layer arranged between the two electrodes, and the light-emitting layer emits light when the transmitted electrons and holes recombine. The organic light-emitting diode is a self-luminous diode using a thin light-emitting layer inserted between the electrodes, and has the advantage that it can be formed into a thin film. In addition, the organic light-emitting diode does not require any light source, so it can be easily implemented as a flexible, bendable and foldable display device, and can be designed into various shapes.

[0006] In addition, in an LCD display device, in order to couple a backlight unit and a liquid crystal module on a bottom cover, a plurality of coupling processes are performed in consideration of a coupling position or coupling sequence of the backlight unit and the liquid crystal module. In particular, a method of fixing an optical sheet and a measure of preventing or alleviating wrinkles caused by thermal deformation are being applied.

[0007] However, in LCD display devices, the optical sheet or the reflective sheet may wrinkle due to thermal deformation during high temperature reliability evaluation. In addition, since the optical sheet and the reflective sheet are formed of thin sheet materials, assembly failure may occur in the process of assembling the optical sheet, the reflective sheet and the light guide plate in the bottom cover. Summary of the invention

[0008] Accordingly, the present invention is directed to a backlight unit and a display device including the same that substantially obviate one or more problems due to limitations and disadvantages of the related art.

[0009] An object of the present invention is to provide a backlight unit in which a reflective sheet is improved into a mold-type reflector structure having a predetermined shape so as to simultaneously accommodate a light guide plate and an optical sheet.

[0010] Another object of the present invention is to provide a backlight unit in which a light guide plate can be fixed by a reflector without using a conventional structure for supporting the light guide plate, thereby providing light having uniform brightness.

[0011] Still another object of the present invention is to provide a display device in which a reflector can fix an optical sheet even when the optical sheet is thermally deformed, thereby minimizing image quality degradation due to, for example, generation of wrinkles.

[0012] Other advantages, purposes and features of the present invention will be described in part in the following description, and in part will become apparent to those skilled in the art when studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be realized and obtained through the structures particularly pointed out in the written description and claims and the accompanying drawings.

[0013] To achieve these objects and other advantages and in accordance with the purposes of the present invention, as embodied and broadly described herein, a backlight unit includes: a light guide plate; an optical sheet arranged on an upper surface of the light guide plate; a reflector configured to accommodate the light guide plate and the optical sheet; and a bottom cover configured to accommodate the reflector.

[0014] The reflector may include at least one first guide pocket protruding from one side surface of the reflector or two side surfaces of the reflector opposite to each other.

[0015] The bottom cover may include at least one first pocket groove formed in one sidewall of the bottom cover such that the at least one first guide pocket is inserted into the at least one first pocket groove.

[0016] The light guide plate may include at least one first protrusion configured to protrude to be mounted in the at least one first guide pocket.

[0017] The optical sheet may include at least one second protrusion configured to protrude to be mounted in the at least one first guide pocket.

[0018] The reflector may further include at least one second guide pocket protruding from another side surface opposite to the one side surface of the reflector.

[0019] The backlight unit may further include at least one shock-absorbing pad inserted into the at least one second guide pocket to contact a side surface of the light guide plate corresponding to the other side surface of the reflector.

[0020] The at least one shock-absorbing pad may elastically press the light guide plate from inside the at least one second guide pocket.

[0021] The bottom cover may include at least one second pocket groove formed in a side wall of the bottom cover corresponding to the other side of the reflector such that the at least one second guide pocket is inserted into the at least one second pocket groove.

[0022] A light source configured to emit light toward the light guide plate may be disposed on other side surfaces of the reflector adjacent to the at least one first protrusion.

[0023] In another aspect of the present invention, a display device includes: a guide plate configured to support an edge area of ​​a rear surface of a display panel; and a backlight unit including: a bottom cover configured to be opposite to the guide plate; an optical sheet inserted between the guide plate and the bottom cover; a light guide plate arranged on a rear surface of the optical sheet; a reflector configured to accommodate the light guide plate; and a light source configured to emit light to the light guide plate.

[0024] The reflector may include: at least one first guide pocket protruding from one side surface or two side surfaces opposite to each other of the reflector; and at least one second guide pocket protruding from the other side surface of the reflector opposite to the one side surface.

[0025] The guide plate may include at least one pocket cover configured to cover an upper portion of the at least one first guide pocket.

[0026] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this application, illustrate embodiments of the present invention and together with the description serve to explain the principle of the present invention. In the drawings:

[0028] Figure 1 is a perspective view illustrating the interior of a vehicle provided with a display device according to an embodiment of the present invention;

[0029] Figure 2 It is a graphic Figure 1 An exploded perspective view of the display device shown;

[0030] Figure 3 It is a graphic Figure 2 A plan view of the reflector shown;

[0031] Figure 4 yes Figure 3 A cross-sectional view of the reflector shown taken along line II';

[0032] Figure 5 It is a graphic Figure 3 A partial enlarged view of region A of the reflector shown;

[0033] Figure 6 It is a graphic Figure 3 A partial enlarged view of region B of the reflector shown;

[0034] Fig. 7A and 7B is a reference diagram illustrating brightness uniformity measurement of a blocker depending on the presence or absence of a light guide plate;

[0035] Figure 8 is a graph of brightness measured by a blocker depending on the presence or absence of a light guide plate;

[0036] Fig. 9 It is a graphic Figure 3 An enlarged view of a portion of region C of the reflector is shown. DETAILED DESCRIPTION

[0037] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are shown in the accompanying drawings. However, the present invention may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein, which are provided only to fully disclose the present invention and fully inform those skilled in the art of the scope of the present invention, which is intended to be limited by the appended claims.

[0038] The shapes, sizes, ratios, angles and quantities disclosed in the accompanying drawings for describing the embodiments of the present invention are exemplary only and do not limit the present invention. In the following description of the embodiments and the accompanying drawings, the same or similar elements are represented by the same reference numerals, even if they are shown in different drawings. In the following description of the embodiments of the present invention, when it is possible to make the subject matter of the present invention unclear, the detailed description of the known functions and configurations incorporated herein will be omitted. In the following description of the embodiments, the terms "including", "comprising" and "having" will be interpreted as indicating the presence of one or more other features, quantities, steps, operations, elements or parts or their combinations stated in the specification, unless the term "only" is used, otherwise the presence of features, quantities, steps, operations, elements, parts or their combinations or the possibility of adding them are not excluded. It will be understood that, unless otherwise stated, singular expressions include plural expressions.

[0039] When interpreting elements included in various embodiments of the present invention, it will be interpreted that these elements include an error range even if there is no explicit statement.

[0040] In the following description of embodiments, it will be understood that when expressing a positional relationship, for example, when an element is "on," "over," "under," or "beside" another element, the two elements may be in direct contact with each other, or one or more other elements may be interposed between the two elements, unless the terms "only" or "directly" are used.

[0041] In the following description of embodiments, it will be understood that when expressing a temporal relationship, for example, when using terms expressing a sequence of events such as "after," "later," "subsequently," and "before," unless the terms "only" or "directly" are used, the terms cover either a continuous relationship between events or a discontinuous relationship between events.

[0042] In the following description of the embodiments, it will be understood that when the terms "first", "second", etc. are used to describe various elements, these terms are only used to distinguish the same or similar elements. Therefore, without departing from the technical scope of the present invention, the first element described below may be the second element.

[0043] In the following description of embodiments, it will be understood that the terms "first", "second", "A", "B", "(a)", "(b)", etc. may be used to describe various elements. These terms are used only to distinguish the corresponding elements from other elements and do not limit the nature, order, sequence, or quantity of the corresponding elements. When an element or layer is referred to as being "engaged", "coupled" or "connected" to another element or layer, the element or layer may be directly engaged, coupled or connected to the other element or layer, or engaged, coupled or connected to the other element or layer via another element, or intermediate elements or layers may be "inserted" between the various elements.

[0044] In the present invention, in a narrow sense, a "display device" may include display devices each having a display panel and a driving unit for driving the display panel, such as a liquid crystal module (LCM), an organic light emitting diode (OLED) module, and a quantum dot (QD) module. In addition, a "display device" may include a complete product (i.e., a final product) having an LCM, an OLED module, and a QD module, such as a notebook computer, a TV, a computer monitor, and a car display, as well as other equipment display devices for vehicles and unit electronic devices or unit devices (such as mobile electronic devices, i.e., a smart phone or an electronic tablet).

[0045] Therefore, in the following description of the embodiments, the display device may include display devices such as LCM, OLED module and QD module in a narrow sense, and include application products or unit devices having LCM, OLED module and QD module as final consumer products.

[0046] In addition, in some cases, an LCM, OLED module or QD module including a display panel and a driving unit may be referred to as a display device in a narrow sense, and an electronic device (i.e., a complete product) including an LCM, OLED module or QD module may be referred to as a unit device in a different sense. For example, a display device in a narrow sense may conceptually include an LCD, OLED or QD display panel and a source PCB as a controller for driving the display panel, and a unit device may conceptually further include a unit PCB as a controller, which is conductively connected to the source PCB to control the entire unit device.

[0047] As the display panel used in the embodiment of the present invention, all types of display panels can be used, such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, a quantum dot (QD) display panel, and an electroluminescent display panel, and the display panel used in the embodiment of the present invention is not limited to any specific type of display panel, i.e., a display panel capable of bending a frame using a flexible substrate and a backplane support structure of an OLED display panel. In addition, the display panel used in the display device according to the embodiment of the present invention is not limited in shape and size.

[0048] For example, when a liquid crystal display panel is used as a display panel, the display panel includes a plurality of gate lines, a plurality of data lines, and pixels formed at intersections between the gate lines and the data lines. In addition, the display panel may include: an array substrate including thin film transistors as switching elements for adjusting light transmittance in pixels respectively; an upper substrate having a color filter and / or a black matrix; and a liquid crystal layer formed between the array substrate and the upper substrate.

[0049] Figure 1 is a perspective view illustrating the interior of a vehicle provided with a display device according to an embodiment of the present invention, Figure 2 It is a graphic Figure 1 An exploded perspective view of the display device shown.

[0050] A liquid crystal display (LCD) device will be exemplarily described as Figure 1 The display panel shown.

[0051] refer to Figure 1 and Figure 2, the display device 100 according to an embodiment of the present invention may have an approximately rectangular shape. However, the display device 100 is not limited to the rectangular shape, and may be manufactured to have any of various shapes, such as a polygonal shape or a curved shape. The display device 100 may include a display panel (not shown), a backlight unit, and a guide plate 150.

[0052] The display device 100 may be in a state where a display function and a touch function are integrated, a cover window may be bonded to the front surface of the display device 100, and a display panel may be arranged on the rear surface of the cover window. The display device 100 may be arranged at a dashboard 11 or a center dashboard 12 on a dashboard 10 of a vehicle. Here, the cover window may be a cover glass formed of glass.

[0053] The backlight unit may include: a light guide plate 111; an optical sheet 112 disposed on an upper surface of the light guide plate 111; a reflector 120 configured to accommodate the optical sheet 112 and the light guide plate 111; a bottom cover 130 configured to accommodate the reflector 120; and a light source 113 (refer to Figure 6 ).

[0054] In the display device 100 according to the embodiment of the present invention, the reflector 120 is improved to have a mold-type structure to accommodate the light guide plate 111 and the optical sheet 112, thereby enabling simultaneous alignment and assembly of the light guide plate 111, the optical sheet 112 and the reflector 120.

[0055] The light guide plate 111 may convert light from a light source 113 into surface light, and the light source 113 is formed as at least one point light source or a linear light source. The light guide plate 111 may have an approximately rectangular shape. One first protrusion 114 or a plurality of first protrusions 114 may be disposed on one side of the light guide plate 111. Of course, the first protrusion 114 may be disposed on the other side of the light guide plate 111 opposite to the one side. The embodiment of the present invention exemplarily illustrates that the first protrusion 114 is disposed on two side surfaces of the light guide plate 111 opposite to each other. Two first protrusions 114 may be disposed adjacent to the central area of ​​one side surface of the light guide plate 111, and one first protrusion 114 may be disposed adjacent to the central area of ​​the other side surface of the light guide plate 111 (refer to Figure 3 ).

[0056] The optical sheet 112 may be arranged on the upper surface of the light guide plate 111 to form a multi-layer structure. The optical sheet 112 may include a diffusion sheet 112a, a first prism sheet 112b, and a second prism sheet 112c.

[0057] The diffusion sheet 112a may contact the upper surface of the light guide plate 111 or be disposed adjacent to the upper surface of the light guide plate 111. The diffusion sheet 112a may make the brightness of the light emitted from the light guide plate 111 uniform, thereby maintaining the surface light with more uniform brightness. The diffusion sheet 112a may have an approximately rectangular shape.

[0058] The first prism sheet 112b may be arranged on the upper surface of the diffusion sheet 112a, and the second prism sheet 112c may be arranged on the upper surface of the first prism sheet 112b. The respective prism sheets 112b and 112c may converge light propagating in the lateral direction to propagate in the forward direction, thereby increasing the brightness of the light. The respective prism patterns of the first prism sheet 112b and the second prism sheet 112c may be arranged at right angles to each other. The first prism sheet 112b and the second prism sheet 112c may have a size and shape corresponding to the diffusion sheet 112a.

[0059] The second protrusion 115 protruding outward may be provided on one side of each optical sheet 112. Also, the second protrusion 115 may be provided on the other side of each optical sheet 112. The second protrusion 115 may be arranged at a position overlapping the first protrusion 114 in a vertical direction.

[0060] The guide plate 150 may support the display panel from above and be connected to the bottom cover 130. A bag cover 151 may be provided on a side of the guide plate 150 at a position corresponding to the first protrusion 114 or the second protrusion 115. When the guide plate 150 and the bottom cover 130 are coupled, the bag cover 151 may be arranged to cover at least upper portions of the first protrusion 114 and the second protrusion 115. The bag cover 151 may be configured as a guide bag covering the reflector 120, which will be described below.

[0061] Figure 3 It is a graphic Figure 2 A plan view of the reflector shown, Figure 4 yes Figure 3 The reflector shown is a cross-sectional view taken along line II'. Figure 5 It is a graphic Figure 3 An enlarged view of a detail of area A of the reflector is shown.

[0062] refer to Figures 3 to 5, the reflector 120 includes a guide bag 121 protruding outwardly provided on at least one side. The reflector 120 may be formed of polycarbonate (PC). Therefore, the reflector 120 has properties such as impact resistance, heat resistance, weathering resistance, self-extinguishing and transparency, and the impact absorption capacity is about 150 times or more of tempered glass, so it has excellent flexibility and processability. Of course, the material used for the reflector 120 is not limited thereto. The reflector 120 may basically have a box shape, the upper surface of which is open. The first guide bag 121 may protrude from the side of the reflector 120. Of course, the first guide bag 121 may be provided on another surface of the reflector 120 opposite to one surface of the reflector 120. Because the light guide plate 111 or the optical sheet 112 is arranged in the reflector 120, the first protrusion 114 and the second protrusion 115 may be inserted into the first guide bag 121 to overlap with the first guide bag 121. Therefore, the first guide bag 121 may cover the side and lower surface of the first protrusion 114 and the second protrusion 115. When the light guide plate 111 and the optical sheet 112 are coupled to the inside of the reflector 120, the first protrusion 114 and the second protrusion 115 are coupled to the first guide pocket 121, so that the alignment of the light guide plate 111 and / or the optical sheet 112 with the reflector 120 can be achieved. Therefore, compared with the process of aligning and coupling the light guide plate, the reflective sheet, the optical sheet, and the bottom cover with each other in the conventional assembly process, the alignment and coupling of the light guide plate 111 and the optical sheet 112 with the reflector 120 can be simplified. Only by coupling the light guide plate 111 and the optical sheet 112 to the inside of the reflector 120, the alignment of the light guide plate 111 and the optical sheet 112 with the reflector 120 can be performed at the same time as the assembly process.

[0063] The reflector 120 may be installed in the bottom cover 130. The first pocket groove 131 may be formed at a side position of the bottom cover 130 corresponding to the position of the first guide pocket 121 by cutting off some areas of the side wall of the bottom cover 130. Therefore, the first guide pocket 121 may be exposed from the side wall of the bottom cover 130.

[0064] Figure 6 It is a graphic Figure 3 A partial enlarged view of region B of the reflector is shown, Fig. 7A and 7B is a reference diagram illustrating brightness uniformity measurement depending on the presence or absence of a blocker of a light guide plate, Figure 8 is a graph of brightness measured depending on whether or not there is a blocker of the light guide plate.

[0065] refer to Figures 6 to 8, the light source 113 may be arranged in the edge region s3, and one side surface of the reflector 120 and another side surface s2 opposite to the one side surface are adjacent to the edge region s3. Of course, when the backlight unit is an edge type backlight unit, the light source 113 may be arranged in edge regions opposite to each other, and when the backlight unit is a direct type backlight unit, the light source 113 may be arranged on the rear surface of the light guide plate 111. In this embodiment, the backlight unit has an edge type structure, and the light source 113 is disposed only in one edge region s3.

[0066] Conventionally, a blocker (not shown) is provided at both ends of the edge region s3 in which the light source 113 is arranged. On the other hand, in the present invention, the first protrusion 114 is coupled to the first guide bag 121, so the blocker can be omitted. Therefore, the position of the light source 113 can be moved closer to both ends of the edge region s3 where the conventional blocker is removed, thereby providing uniform brightness to the edge region of the light guide plate 111. Fig. 7A and 7B Illustration of the resulting effect.

[0067] Fig. 7A The structure in which the blocker is removed from the light guide plate 111 according to an embodiment of the present invention is illustrated. Figure 7B Illustrate a conventional structure in which a barrier is applied to a light guide plate.

[0068] [Table 1]

[0069] Remove the LGP blocker (a) Apply LGP blocker (b) Minimum 87.4％ 84.6％ Maximum 92.9％ 89.3％ average value 91.1％ 87.5％

[0070] As shown in Table 1, the average value of the structure in which the blocker is omitted from the light guide plate 111 according to the present invention is 91.1%, and the average value of the conventional structure in which the blocker is applied to the light guide plate is 87.5%. Therefore, it can be confirmed that the average value is increased by about 4% by removing the blocker from the light guide plate 111. Figure 8 , (a) represents a brightness curve of a structure with a blocker removed according to an embodiment of the present invention, and (b) represents a brightness curve of a conventional structure with a blocker applied.

[0071] refer to Figure 8 , the x-axis represents the position of the light source 113, and the y-axis represents the brightness. It can be confirmed that the brightness curve (a) of the structure with the blocker removed according to an embodiment of the present invention shows a significant increase in the brightness of the portion of the structure where the light source 113 is initially arranged relative to the brightness curve (b) of the conventional structure with the blocker applied.

[0072] That is, since the blocker is removed from the light guide plate 111, the light source 113 moves closer to the two ends of the edge area s3 of the light guide plate 111, becoming closer to the side S2 adjacent to the two ends of the edge area s3. Therefore, it can be inferred that the brightness in the two ends of the edge area of ​​the light guide plate 111 increases, thereby increasing the brightness uniformity.

[0073] Fig. 9 It is a graphic Figure 3 An enlarged view of a portion of region C of the reflector is shown.

[0074] refer to Figure 3 and Fig. 9 , the second guide pocket 122 may be disposed on the other side s2 of the reflector 120. Here, the surface of the light guide plate 111 facing the other side s2 of the reflector 120 may be formed as a plane. Therefore, an empty space may be formed in the second guide pocket 122 between the reflector 120 and the other side of the light guide plate 111, and the shockproof pad 140 may be inserted into the empty space.

[0075] The shockproof pad 140 may be formed of the same material as the foam pad or an elastic material. The shockproof pad 140 in the second guide bag 122 squeezes or supports the other side of the light guide plate 111, thereby preventing the movement of the light guide plate 111 while preventing the movement noise from the light guide plate. Here, the second guide bag 122 may be formed so as not to be exposed to the outside of the bottom cover 130. Therefore, it is not necessary to ensure an additional space for the second guide bag 122. In addition, the other side of the light guide plate 111 may be arranged to be spaced apart from the other side s2 of the reflector 120. The shockproof pad 140 supports the portion where the light guide plate 111 and the other side s2 of the reflector 120 are spaced apart from each other, thereby supplementing the spaced portion of the light guide plate 111 and the other side s2 of the reflector 120.

[0076] A plurality of second guide pockets 122 may be provided on the other side s2 of the reflector 120 .

[0077] The bottom cover 130 may be provided with a second pocket groove 132 configured to accommodate a protruding portion of the second guide pocket 122. Here, a protruding distance of the second guide pocket 122 may correspond to a thickness of a side wall of the bottom cover 130. That is, the second guide pocket 122 may be arranged such that an outer surface of the second guide pocket 122 is exposed from the second pocket groove 132 of the bottom cover 130 but does not protrude to the outside of the side wall of the bottom cover 130. Therefore, even if a pocket cover is not separately provided on the guide plate 150, when the guide plate 150 is coupled to the bottom cover 130, the guide plate 150 may cover the second guide pocket 122.

[0078] Therefore, in a backlight unit according to an embodiment of the present invention and a display device including the backlight unit, the reflector can be modified from a sheet type to a mold type to minimize image quality degradation caused by shrinkage and expansion during reliability evaluation, the reflector can accommodate a light guide plate and an optical sheet so that alignment and assembly of the light guide plate, the optical sheet and the reflector can be performed simultaneously, and unnecessary supporting structures can be omitted from the light guide plate to provide surface light with high brightness and uniform brightness.

[0079] As is apparent from the above description, a backlight unit and a display device including the same according to an embodiment of the present invention have the following effects.

[0080] First, the reflector is modified from a sheet type to a mold type, thereby being able to minimize image quality degradation caused by shrinkage and expansion during reliability evaluation.

[0081] Second, the reflector accommodates the light guide plate and the optical sheet, so that alignment and assembly of the light guide plate, the optical sheet and the reflector can be performed simultaneously.

[0082] Third, an unnecessary supporting structure may be omitted from the light guide plate, thereby being able to provide surface light having high and uniform brightness.

[0083] The features, structures and effects described in the above-mentioned embodiments of the present invention are included in at least one embodiment of the present invention, and are not limited to one embodiment. In addition, it is obvious to those skilled in the art that the features, structures and effects described in at least one embodiment of the present invention can be combined or modified in other embodiments. Therefore, the contents related to these combinations and modifications should be interpreted as being included in the scope of the present invention.

[0084] It is obvious to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the present invention. Therefore, the present invention is intended to cover modifications and variations of the present invention as long as they fall within the scope of the appended claims and their equivalents.

Claims

1. A backlight unit, comprising: Light guide plate; An optical sheet, arranged on the upper surface of the light guide plate; a reflector having a mold-type structure to accommodate the light guide plate and the optical sheet; and a bottom cover configured to accommodate the reflector, wherein the reflector comprises at least one first guide pocket protruding from one side surface or two sides opposite to each other of the reflector, and at least one second guide pocket protruding from another side surface opposite to the one side surface of the reflector, wherein the light guide plate comprises at least one first protrusion mounted in the at least one first guide pocket, wherein the first guide pocket covers all side surfaces and a lower surface of the first protrusion, wherein at least one shock-absorbing pad is inserted into the at least one second guide pocket to contact a side surface of the light guide plate corresponding to the other side surface of the reflector, wherein the bottom cover comprises at least one first pocket groove formed in one side wall of the bottom cover such that the at least one first guide pocket is inserted into the at least one first pocket groove and is exposed from the one side wall of the bottom cover. 2 . The backlight unit of claim 1 , wherein the optical sheet comprises at least one second protrusion configured to protrude to be mounted in the at least one first guide pocket. 3 . The backlight unit according to claim 1 , wherein the at least one shock-absorbing pad elastically presses the light guide plate from an inside of the at least one second guide pocket.

4. The backlight unit according to claim 1, wherein the bottom cover comprises at least one second pocket groove formed in another side wall opposite to one side wall of the bottom cover such that the at least one second guide pocket is inserted into the at least one second pocket groove. 5 . The backlight unit according to claim 1 , wherein a light source configured to emit light toward the light guide plate is arranged on other side surfaces of the reflector adjacent to the at least one first protrusion.

6. A display device comprising: a guide plate configured to support an edge region of a rear surface of the display panel; and Backlight unit, comprising: a bottom cover, configured to be opposite to the guide plate; an optical sheet inserted between the guide plate and the bottom cover; a light guide plate, arranged on the rear surface of the optical sheet; a reflector having a mold-type structure to accommodate the light guide plate; and a light source configured to emit light toward the light guide plate, wherein the reflector comprises at least one first guide pocket protruding from one side surface or two sides opposite to each other of the reflector, and at least one second guide pocket protruding from another side surface opposite to the one side surface of the reflector, wherein the light guide plate comprises at least one first protrusion mounted in the at least one first guide pocket, wherein the first guide pocket covers all side surfaces and a lower surface of the first protrusion, wherein at least one shock-absorbing pad is inserted into the at least one second guide pocket to contact a side surface of the light guide plate corresponding to the other side surface of the reflector, wherein the bottom cover comprises at least one first pocket groove formed in one side wall of the bottom cover such that the at least one first guide pocket is inserted into the at least one first pocket groove and is exposed from the one side wall of the bottom cover. 7 . The display apparatus according to claim 6 , wherein the guide plate comprises at least one pocket cover configured to cover an upper portion of the at least one first guide pocket.

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