Backlight unit and display apparatus

Abstract

The invention relates to a backlight unit and a display apparatus. A backlight unit according to the present invention comprises: a backlight substrate including a plurality of first substrates arranged at a predetermined interval in a first direction and extending in a second direction perpendicular to the first direction, and a second substrate connecting the plurality of first substrates; a plurality of light-emitting devices disposed at predetermined intervals on the front surface of the backlight substrate; the back plate comprises a substrate placing part and a first protruding part, the substrate placing part is used for placing the back face of the backlight substrate, and the first protruding part is located between the first substrates and protrudes forwards; the reflecting plate is positioned on the front surface of the backlight substrate; and an adhesive tape located between the backlight substrate and the reflecting plate to attach the backlight substrate and the first protruding portion of the back plate to the reflecting plate, the backlight unit can ensure rigidity while reducing manufacturing cost.

Description

Technical Field

[0001] The present invention relates to a backlight unit capable of ensuring rigidity while reducing manufacturing costs, and a display device provided with the backlight unit. Background Art

[0002] With the development of information society, the requirements for display devices have also increased in various forms. Correspondingly, in recent years, displays include liquid crystal displays (LCD), field emission displays (FED), plasma display panels (PDP) and electroluminescent devices (Electroluminescence Device).

[0003] A liquid crystal panel of the liquid crystal display includes a liquid crystal layer, and a TFT substrate and a color filter substrate facing each other with the liquid crystal layer interposed therebetween, and may display an image using light provided from a backlight unit.

[0004] As an example of an electroluminescent device, an active matrix type organic light emitting display is currently on the market. Since an organic light emitting display is a self-luminous device, it has no backlight and has advantages over a liquid crystal display in terms of response speed and viewing angle, and therefore has attracted much attention as a next-generation display.

[0005] In recent years, since materials such as OLEDs emit light by themselves without a backlight structure at the rear, curved display panels can be realized, thereby realizing curved displays.

[0006] Currently, in order to reduce the manufacturing cost of displays while reducing weight, research is actively being conducted to omit unnecessary parts to achieve the smallest possible components. Summary of the invention

[0007] Problem that the invention aims to solve

[0008] An object of the present invention is to provide a backlight unit capable of reducing manufacturing costs while ensuring rigidity, and a display device provided with the backlight unit.

[0009] Technical solutions to the problem

[0010] The present invention provides a backlight unit, which includes: a backlight substrate, including a first substrate and a second substrate, a plurality of the first substrates are arranged at specified intervals along a first direction and extend along a second direction perpendicular to the first direction, and the second substrate connects the plurality of the first substrates; a plurality of light-emitting devices are arranged at specified intervals on the front side of the backlight substrate; a back plate, including a substrate placement portion and a first protruding portion (bead), the substrate placement portion is used for placing the back side of the backlight substrate, the first protruding portion is located between the first substrates and protrudes forward; a reflective plate, located on the front side of the backlight substrate; and an adhesive tape, located between the backlight substrate and the reflective plate, so that the backlight substrate and the first protruding portion of the back plate are attached to the reflective plate.

[0011] The adhesive tape and the reflective plate may include a light source hole formed at a position corresponding to the light emitting device.

[0012] A height difference between the first protrusion of the rear plate and the substrate seating portion may correspond to a height of the backlight substrate.

[0013] The backlight unit may include a second protrusion portion located between the substrate seating portion and the first protrusion portion and protruding toward a rear direction compared with the substrate seating portion.

[0014] The interval between the first substrates may be equivalent to the length of the first substrate in the first direction.

[0015] The second substrate may be located at an end portion of the first substrate in the second direction.

[0016] The backlight unit may include a diffusion plate supporter located between the first substrates and fastened to the rear plate.

[0017] The diffusion plate support may be coupled to a fastening hole formed at the first protrusion.

[0018] The diffuser plate support may include: a support protrusion protruding forward; a support hook extending toward the back of the support protrusion and inserted into the fastening hole of the first protrusion; and an elastic portion extending toward the side direction of the support protrusion, with its end contacting the top surface of the reflective plate.

[0019] The supporter hook may include an end portion bent toward one side of the second direction and a third direction opposite to the second direction, and the rear plate may include a fixing hole adjacent to the fastening hole and into which the end portion of the supporter hook is inserted.

[0020] The elastic portion may include a pair extending from the support protrusion toward the second direction and the third direction, and a length of the elastic portion in a bending direction of the end of the support hook may be greater than a length of the elastic portion in an opposite direction thereof.

[0021] The adhesive tape and the reflective plate may include supporter holes formed at positions corresponding to the fastening holes.

[0022] A display device is provided, the display device comprising: a liquid crystal panel; an optical sheet layer, located on the back side of the liquid crystal panel; and a backlight unit, located on the back side of the optical sheet layer; the backlight unit comprising: a backlight substrate, the backlight substrate comprising a first substrate and a plurality of second substrates, the first substrate extending along a first direction, the plurality of second substrates extending from the first substrate toward a second direction perpendicular to the first direction and arranged in a spaced relationship along the first direction; a plurality of light-emitting devices, arranged at a specified interval on the front side of the first substrate and the second substrate; a rear plate, comprising a substrate placement portion and a first protruding portion, the substrate placement portion being used for placement of the back side of the backlight substrate, the first protruding portion being located between the substrate placement portion and the second substrate and protruding forward; a reflective plate, located on the front side of the backlight substrate; and an adhesive tape, located between the backlight substrate and the reflective plate, so that the backlight substrate and the first protruding portion of the rear plate are attached to the reflective plate.

[0023] A height difference between the first protrusion of the rear plate and the substrate seating portion may correspond to a height of the backlight substrate.

[0024] The backlight unit may include a diffusion plate supporter positioned between the second substrates and fastened to a fastening hole formed at the first protrusion of the rear plate.

[0025] The diffuser plate support may include: a support protrusion protruding forward; a support hook extending toward the back of the support protrusion and inserted into the fastening hole of the first protrusion; and an elastic portion extending toward the side direction of the support protrusion, with its end contacting the top surface of the reflective plate.

[0026] Effects of the Invention

[0027] The backlight unit of the present invention can reduce manufacturing costs while ensuring rigidity.

[0028] Effects that can be obtained in the present invention are not limited to the above-mentioned effects, and those skilled in the art can clearly understand other effects that are not mentioned from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a block diagram for explaining a display device associated with the present invention.

[0030] Figure 2 is a perspective view showing a display device according to an embodiment of the present invention.

[0031] Figure 3 FIG. 1 is an exploded perspective view showing a display according to an embodiment of the present invention.

[0032] Figure 4 FIG. 1 is a top view showing a backlight substrate of a backlight unit according to an embodiment of the present invention.

[0033] Figure 5 It is a diagram showing a method of manufacturing the backlight substrate of the present invention.

[0034] Figure 6 FIG. 1 is a top view showing a reflection plate of a backlight unit according to an embodiment of the present invention.

[0035] Figure 7 FIG. 1 is a top view showing an adhesive tape of a backlight unit according to an embodiment of the present invention.

[0036] Figure 8 FIG. 1 is a top view showing a rear plate of a backlight unit according to an embodiment of the present invention.

[0037] Fig. 9 FIG. 4 is an exploded perspective view of a backlight unit according to an embodiment of the present invention.

[0038] Fig.10 It is a partial enlarged view of a backlight unit according to an embodiment of the present invention.

[0039] Fig.11 FIG. 1 is a top view showing a rear plate of a backlight unit according to another embodiment of the present invention.

[0040] Fig.12 and Fig.13 2 is a diagram showing a method of bonding a diffuser plate support member.

[0041] Description of Reference Numerals

[0042] 100: Display device

[0043] 102: Bottom cover

[0044] 110: Wireless Communications Department

[0045] 120: Input

[0046] 140: Sensor Department

[0047] 150: Output

[0048] 160: Cooling unit

[0049] 170: Memory

[0050] 180: Control Department

[0051] 190: Power Supply Department

[0052] 200: Display

[0053] 210: Display panel

[0054] 220: Backlight substrate

[0055] 221: First substrate

[0056] 222: Second substrate

[0057] 226: Lens

[0058] 227: Light-emitting devices

[0059] 230: Adhesive tape

[0060] 231: Light source hole

[0061] 240: Rear plate

[0062] 241: First protrusion

[0063] 242: Second protrusion

[0064] 243: Substrate placement department

[0065] 244: Fastening hole

[0066] 245: Fixing hole

[0067] 250: Reflector

[0068] 251: Light source hole

[0069] 260: Optical sheet

[0070] 270: Diffuser plate support

[0071] 271: Support bulge

[0072] 272: Support hook

[0073] 273: Elasticity

[0074] 273a: First elastic portion

[0075] 273b: Second elastic portion

[0076] 290: Boot Panel DETAILED DESCRIPTION

[0077] Hereinafter, the embodiments disclosed in this specification are described in detail with reference to the accompanying drawings. Regardless of the figure numbers, the same or similar structural elements are given the same figure numbers, and repeated descriptions thereof are omitted. The suffixes "module" and "unit" of the constituent elements used in the following description are only given or mixed for the convenience of writing the description, and they themselves do not have mutually distinguishable meanings or functions. In addition, in the process of describing the embodiments disclosed in this specification, when it is judged that the specific description of the relevant known technology will confuse the gist of the embodiments disclosed in this specification, the detailed description of the known technology is omitted. In addition, the drawings are provided only to facilitate the understanding of the embodiments disclosed in this specification. The technical ideas disclosed in this specification are not limited to the drawings, and should be understood to include all changes, equivalents and substitutes within the technical ideas and technical scope of the present invention.

[0078] Terms including ordinal numbers such as first, second, etc. may be used to describe various structural elements, but the structural elements are not limited to these terms. These terms are used only to distinguish one structural element from another structural element.

[0079] When it is mentioned that a certain component is "coupled" or "connected" to another component, it can be directly coupled or connected to the other component, but it should be understood that other components may exist between them. On the contrary, when it is mentioned that a certain component is "directly coupled" or "directly connected" to another component, it should be understood that no other components exist between them.

[0080] Unless the context clearly indicates otherwise, an expression in the singular includes an expression in the plural.

[0081] In the present application, the terms "including" or "having" etc. should be understood as intending to indicate the existence of the features, numbers, steps, actions, structural elements, parts or their combinations disclosed in the present specification, but not intending to pre-exclude the existence or additional possibilities of one or more other features, numbers, steps, actions, structural elements, parts or their combinations.

[0082] Figure 1 is a block diagram for explaining a display device 100 associated with the present invention.

[0083] The display device 100 may include a wireless communication unit 110, an input unit 120, a sensor unit 140, an output unit 150, a cooling unit 160, a memory 170, a control unit 180, and a power supply unit 190. Figure 1 The plurality of components shown are not essential for realizing the display device 100 , and thus the display device 100 described in this specification may have more or less components than the plurality of components listed above.

[0084] More specifically, the wireless communication unit 110 among the plurality of components may include one or more modules that enable wireless communication between the display device 100 and a wireless communication system, or between the display device 100 and another display device 100, or between the display device 100 and an external server. In addition, the wireless communication unit 110 may include one or more modules that connect the display device 100 to one or more networks.

[0085] Such a wireless communication unit 110 may include at least one of a mobile communication module, a wireless network module, and a short distance communication module.

[0086] The input unit 120 may include a camera 121 or an image input unit for image signal input, a microphone 122 or an audio input unit for audio signal input, and a user input unit 123 (e.g., a touch key, a mechanical key, etc.) for receiving information from a user. Voice data or image data collected from the input unit 120 may be analyzed and processed into a user's control command.

[0087] In recent years, as the size of the frame of the display device 100 becomes smaller, the display device 100 that minimizes the input unit 120 in the form of physical keys exposed to the outside has gradually increased. As an alternative, the smallest physical keys can be set on the back or side, and a touch pad or user input interface unit can be used to detect the signal of the remote control device and receive user input.

[0088] The sensing unit 140 may include one or more sensors for sensing at least one of information within the display device 100, information about the surrounding environment surrounding the display device 100, and user information. For example, the sensing unit 140 may include at least one of a proximity sensor, an illumination sensor, a touch sensor, an RGB sensor, an infrared sensor (IR sensor; infrared sensor), a fingerprint sensor, an ultrasonic sensor, an optical sensor (optical sensor, for example, a camera (refer to 121)), a microphone (refer to 122), a battery gauge, an environmental sensor (for example, a barometer, a hygrometer, a thermometer, a radiation monitoring sensor, a heat monitoring sensor, a gas monitoring sensor, etc.), and a chemical sensor (for example, an electronic nose, a health sensor, a biometric sensor, etc.). On the other hand, the display device 100 disclosed in the present specification may combine and use a plurality of information sensed from at least two or more of such sensors.

[0089] The control unit 180 checks the status of the display device 100 based on the information collected by the sensing unit 140 , and when a problem occurs, can control to notify the user or autonomously adjust to maintain an optimal status.

[0090] The output unit 150 is used to generate output associated with vision, hearing or touch, and may include at least one of the display 200 and the audio output unit 152. The display 200 may be formed as an interlayer structure with the touch sensor or integrally formed with the touch sensor to realize a touch screen. Such a touch screen may provide an output interface between the display device 100 and the user while serving as the user input unit 123 that provides an input interface between the display device 100 and the user.

[0091] The display 200 may be a PDP (Plasma Display Panel), LCD (Liquid Crystal Display), OLED (Organic Light Emitting Diode), a flexible display, etc., and may also be a 3D display. The 3D display 200 may be divided into a non-glasses type and a glasses type.

[0092] On the other hand, since the display 200 is formed of a touch screen, it can be used as an input device in addition to an output device.

[0093] like Figure 2 As shown, the display device 100 of the present invention can configure a plurality of displays 200 in a grid form to implement a display 200 with a large screen.

[0094] The cooling unit 160 refers to a structure for dissipating heat from the display device 100 , and may include a heat pipe, a heat sink, a circulation fan for promoting internal air circulation, a ventilation hole, and the like.

[0095] The display device 100 provided for the purpose of displaying advertisements is driven for a long time and outputs at a high brightness so that it can be easily seen from the outside. Therefore, the heat generated in the display unit 151 and the control unit 180 may affect various components of the display device 100 and cause failures, etc., making the heat dissipation structure for discharging the internal heat very important.

[0096] The heat dissipation of the display device 100 can be achieved in various ways. According to the object to which heat is transferred during the heat dissipation process, it can be divided into air cooling or water cooling. In the case of air cooling, heat dissipation pins can be used to maximize the surface area, thereby improving the heat dissipation efficiency. In the case of water cooling, structures such as heat pipes can be used to guide the path and seal the heat transfer material, thereby improving the heat dissipation efficiency.

[0097] This heat dissipation and cooling method can be used alone or in combination of two or more as needed.

[0098] In addition, the memory 170 stores data that supports various functions of the display device 100. The memory 170 can store a plurality of application programs (application programs or applications) driven in the display device 100, data for the actions of the display device 100, and instructions. At least a portion of such application programs can be downloaded from an external server via wireless communication. In addition, at least a portion of such application programs can exist in the display device 100 from the factory for the basic functions of the display device 100 (for example, the phone receiving and sending functions and the message receiving and sending functions). On the other hand, the application program can be stored in the memory 170 and provided in the display device 100 so that it can be driven by the control unit 180 to perform the actions (or functions) of the display device 100.

[0099] In addition to the actions associated with the application, the control unit 180 generally controls the overall actions of the display device 100. The control unit 180 can process the signals, data, information, etc. input or output through the above-mentioned multiple components or drive the application stored in the memory 170, and provide or process information or functions suitable for the user.

[0100] In addition, the control unit 180 may control at least a part of the plurality of components to drive the application stored in the memory 170. Furthermore, the control unit 180 may combine and operate at least two or more of the plurality of components included in the display device 100 to drive the application.

[0101] The control unit 180 may include at least one processor, and the overall operation of the display device 100 may be controlled by the processor included in the control unit 180. Here, the processor may be a common processor such as a CPU (central processing unit). Of course, the processor may be a dedicated device such as an ASIC or a processor based on other hardware.

[0102] The image signal processed by the control unit 180 may be input to the display 200 and displayed as an image corresponding to the image signal.

[0103] The voice signal processed in the control unit 180 may output sound to the audio output unit 152. In addition, the voice signal processed in the control unit 180 may be input to an external output device through the external device interface unit.

[0104] In addition, the control unit 180 can control the display device 100 according to the user instruction input through the user input interface unit or the internal program. On the other hand, the control unit 180 can control the display 200 to display an image. At this time, the image displayed on the display 200 can be a still image or a video, and can be a 2D image or a 3D image.

[0105] On the other hand, the control unit 180 may display a predetermined 2D object in the image displayed on the display 200. For example, the object may be at least one of a connected web page screen (news, magazines, etc.), an EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and texts.

[0106] On the other hand, the control unit 180 may modulate and / or demodulate the signal using an amplitude shift keying (ASK) method. Here, the amplitude shift keying (ASK) method may be a method of changing the amplitude of a carrier according to a data value to modulate a signal, or a method of restoring an analog signal to a digital data value according to the amplitude of a carrier.

[0107] For example, the control unit 180 may modulate the image signal using an amplitude shift keying (ASK) method and transmit the image signal through the wireless communication module.

[0108] For example, the control unit 180 may demodulate and process the image signal received through the wireless communication module using an amplitude shift keying (ASK) method.

[0109] Thus, the display device 100 can conveniently transmit and receive signals with another image display apparatus arranged adjacently, even without using a unique identifier such as a MAC address (Media Access Control Address) or a complicated communication protocol such as TCP / IP.

[0110] The power supply unit 190 can supply corresponding power to the entire display device 100. In particular, power can be supplied to the control unit 180 implemented in the form of a system on chip (SOC), the display 200 for displaying images, and the audio output unit 152 for outputting audio.

[0111] Specifically, the power supply unit 190 may include a converter (not shown) that converts AC power into DC power and a DC / DC converter (not shown) that converts the level of the DC power.

[0112] On the other hand, the power supply unit 190 can receive power from the outside and distribute the power to each component. The power supply unit 190 can be directly connected to an external power source to supply AC power, or can be a power supply unit 190 that can be charged and used including a battery.

[0113] At least a part of the various components may cooperate with each other to realize the operation, control or control method of the display device 100 of various embodiments described below. In addition, the operation, control or control method of the display device 100 may be realized on the display device 100 by driving at least one application stored in the memory 170.

[0114] That is, as required, two or more components can be combined into one component, or one component can be subdivided into two or more components. In addition, the functions performed in each module are only used to illustrate the embodiments of the present invention, and the specific actions or devices thereof do not limit the scope of the claims of the present invention.

[0115] Figure 2 FIG. 1 is a perspective view of a display device 100 according to an embodiment of the present invention.

[0116] The display device 100 of the present invention can be Figure 2 The whole can be composed of one module as in (a) above, or it can be composed of one module as in (a) above. Figure 2 As shown in (b) in FIG. 1 , a plurality of displays 200 are arranged in a grid pattern on the bottom cover 102 to form a large screen.

[0117] The display 200 may be rectangular and horizontally long, but may also be rotatable or vertically long. In the following, for ease of description, the display device is described based on a horizontally long display device, but is not limited thereto.

[0118] Figure 3 FIG. 2 is an exploded perspective view showing a display 200 according to an embodiment of the present invention.

[0119] Since the display 200 uses a thin substrate or sheet material, it may be bent, deformed or damaged. A rear plate 240 may be included to support the back of the display and obtain a heat dissipation effect. The rear plate 240 is made of a metal material, and the rear plate 240 of the present invention may include a protrusion protruding toward the front or back.

[0120] The display 200 of the present invention includes a backlight unit BLU providing light and a display panel 210 outputting image information by adding color to the light received from the backlight unit BLU. The display panel 210 may include a liquid crystal panel selectively passing light, and a color filter for realizing color may be configured on the liquid crystal panel.

[0121] In order to align the positions of the backlight unit BLU and the display panel 210, a guide panel 290 may be used. The guide panel 290 may have a frame form similar to a photo frame, and the display panel 210 may be installed on the front side and the backlight unit BLU may be installed on the rear side.

[0122] The backlight unit BLU may be provided with a backlight substrate 220 on which a light emitting device 227 emitting light is mounted; a reflective plate 250 located on the front side of the backlight substrate 220 ; and an optical sheet layer 260 including a diffusion plate 261 located on the front side of the reflective plate 250 .

[0123] A plurality of light emitting diodes (LEDs) 227 are arranged in a lattice pattern on the backlight substrate 220. The backlight substrate 220 receives power and applies the power to each of the light emitting diodes 227, thereby providing light to the display panel 210 located on the front.

[0124] In order to diffuse the light emitted from the light emitting device 227 to a predetermined range, a silicon lens 226 may be included. The silicon lens 226 may include a light-transmitting material and may include a diffusing agent to improve the diffusion effect. The silicon lens 226 may cover the light emitting device 227 and be disposed in a predetermined area around the light emitting device 227.

[0125] Figure 4 FIG. 2 is a top view of a backlight substrate 220 of a backlight unit BLU according to an embodiment of the present invention. Instead of a monolithic rectangular plate, the backlight substrate 220 of the present invention includes a plurality of first substrates 221 spaced apart and arranged side by side along a first direction D1 and extending along a second direction D2.

[0126] The plurality of first substrates 221 are arranged at a predetermined distance apart along the first direction, and the size of the space 223 in the second direction D2 may be equal to or greater than the width of the first substrate 221 in the second direction D2. One side of the first substrate 221 includes a second substrate 222 connecting the plurality of first substrates 221, and the backlight substrate 220 may have a fork shape.

[0127] The first substrate 221 of the backlight substrate 220 does not necessarily have to be in a straight line shape, but may also have a zigzag shape. Figure 4 As shown, the second direction D2 can be a long side direction or a short side direction.

[0128] Figure 5 2 is a diagram showing a method of manufacturing a backlight substrate 220 according to the present invention. Figure 5 As shown in (a) in FIG. 1 , the entire plate-shaped substrate can be cut into pieces to form the following Figure 5 The two fork-shaped backlight substrates 220 shown in (b) in FIG. 2 can be formed by cutting a whole plate-shaped substrate in a meandering shape.

[0129] The fork-type backlight substrate 220 of the present invention can be realized with about 1 / 2 of the area of ​​a whole-type substrate, thereby reducing costs and reducing product weight.

[0130] In such Figure 5 In the state of a whole block as in (a) in FIG. 1 , the light emitting device 227 connector and other components can be mounted on the substrate using the SMT (Surface Mounter Technology) method and then cut to separate them into Figure 5Two fork-shaped substrates as shown in (b).

[0131] In order to convert the light of the light emitting device 227 as a point light source into a surface light source, a diffusion plate 261 is required. The diffusion plate 261 can scatter the light and provide it to the display panel 210 with uniform brightness. In order to fully scatter the light in the diffusion plate 261, the optical sheet layer 260 can be arranged at a predetermined distance from the light emitting device 227.

[0132] The optical sheet layer 260 including the diffuser plate 261 can be composed of a plurality of thin and transparent materials, and the guide panel 290 can guide the optical sheet layer 260, the reflective plate 250 and the backlight substrate 220 to align at an accurate position. In order to maintain the distance between the optical sheet layer 260 and the light emitting device 227, a diffuser plate support 270 can be provided.

[0133] The diffuser plate support member 270 supports the optical sheet 260 to maintain the distance between the optical sheet 260 and the light emitting device 227. The diffuser plate support member 270 may be disposed at a position where the light emitting device 227 is not formed, and may be provided in plurality at a predetermined distance.

[0134] Reference Figure 4 In the backlight unit BLU of the present invention, the diffusion plate support member 270 can be configured by using the space between the first substrates 221 of the fork-shaped backlight substrate 220. The backlight unit BLU of this embodiment includes five diffusion plate support members 270, but is not limited thereto.

[0135] The diffusion plate support member 270 may be fixed to the rear plate 240 described later, and may increase the fastening force of the reflector 250 , the backlight substrate 220 , and the rear plate 240 by applying pressure to the reflector 250 located in front of the backlight substrate 220 .

[0136] When the light provided by the light emitting device 227 is reflected by the optical sheet 260 or the display panel 210 and cannot be irradiated in the front direction, the light may be lost. If the light is lost, the brightness of the display device 100 decreases. Therefore, a reflective plate 250 may be further provided to allow all the light irradiated from the light emitting device 227 to be directed in the front direction.

[0137] Figure 6 2 is a top view of a reflective plate 250 of a backlight unit BLU according to an embodiment of the present invention. The reflective plate 250 includes a light source hole 251 for exposing the light emitting device 227 formed on the backlight substrate 220, and the remaining area may have a surface with high reflectivity.

[0138] The end of the reflective plate 250 may include an inclined surface extending by a length corresponding to the distance between the end of the reflective plate 250 and the optical sheet 260. The end of the reflective plate 250 may be mounted to the back of the guide panel 290 together with the optical sheet 260.

[0139] The reflective plate 250 is combined with the front side of the backlight substrate 220 . In order to combine the backlight substrate 220 with the reflective plate 250 , an adhesive tape 230 may be provided. The adhesive tape 230 is located on the front side of the backlight substrate 220 .

[0140] Figure 7 2 is a top view showing an adhesive tape 230 of a backlight unit BLU according to an embodiment of the present invention. The adhesive tape 230 may include a light source hole 231 formed at a position corresponding to the light emitting device 227 so that the light emitting device 227 is exposed through the light source hole 251 of the reflective plate 250.

[0141] The light source hole 231 of the adhesive tape 230 may be formed to be larger than the light source hole 251 of the reflective plate 250 so that the adhesive tape 230 is not exposed through the light source hole 251 of the reflective plate 250 or overlapped with the light emitting device 227 .

[0142] The adhesive tape 230 is not cut into a fork shape like the backlight substrate 220. The adhesive tape 230 is not only disposed on the front of the first substrate 221 and the second substrate 222 of the backlight substrate 220, but can also be disposed between a plurality of first substrates 221.

[0143] The adhesive tape 230 may be attached to the front surface of the rear plate 240 exposed from the space between the first substrates 221 while combining the reflective plate 250 with the backlight substrate 220 , so that the rear plate 240 and the reflective plate 250 are combined.

[0144] However, the rear plate 240 is configured to be spaced apart from the adhesive tape 230 by a thickness corresponding to the first substrate 221 , and thus the rear plate 240 of the present invention may include a first protrusion 241 protruding forward corresponding to the space 223 between the first substrates 221 . Figure 8 FIG. 2 is a top view showing a rear panel 240 of a backlight unit BLU according to an embodiment of the present invention.

[0145] The rear plate 240 is a structure for discharging heat generated by the plurality of light emitting devices 227 mounted on the backlight substrate 220 while supporting the backlight substrate 220. For the sake of rigidity and heat dissipation efficiency, it may include a metal material. In the case of a wall-mounted display device 100 whose back surface is not exposed to the outside, the rear plate 240 itself may constitute the rearmost structure of the display device 100.

[0146] The rear plate 240 of the present invention may include a substrate placement portion 243 for placing the backlight substrate 220 and a plurality of first protrusions 241 protruding forward from the empty space between the first substrates 221. The first protrusions 241 may be formed by pressing a metal plate from one side to the other side, such as Figure 8 As shown in the enlarged view of , according to the zigzag shape, the side surface of the first protrusion 241 may include an inclined surface.

[0147] The first protrusions 241 of this embodiment may have a shape extending along the second direction D2 like the first substrate 221, and may be spaced apart along the first direction D1. A substrate seating portion 243 for seating the first substrate 221 may be formed between the first protrusions 241. The first protrusions 241 do not necessarily have to be continuous, and may also be partially formed.

[0148] Reference Figure 8 , the first protrusion 241 may not extend to the region (left side) where the second substrate 222 is disposed, and the first protrusion 241 may be omitted. The first protrusion 241 may be formed only at a position where the fastening hole 244 of the diffusion plate support 270 is combined and the fixing hole 245 is formed.

[0149] Fig. 9 FIG. 2 is a top view of a back plate 240 of a backlight unit BLU according to another embodiment of the present invention. As an example of a back plate 240 disposed on the back of a backlight substrate 220 including the first substrate 221 having a sawtooth shape, substrate placement portions 243 may be disposed corresponding to the shape of the backlight substrate 220, and first protrusions 241 may be disposed between the substrate placement portions 243.

[0150] like Figure 8 As shown in the embodiment, although a straight line shape can easily form a continuous first protrusion 241, in the case of this embodiment, it is difficult to form the first protrusion 241 into a zigzag shape, so it can be constructed as a plurality of first protrusions 241 that are arranged in only one direction and disconnected.

[0151] Fig.10 As an enlarged view showing the backlight substrate 220 seated on the rear plate 240 , the first protrusions 241 are provided between the first substrates 221 , and the space between the first substrates 221 without the first protrusions 241 may have the same height as the substrate seating portion 243 .

[0152] Due to the burr generated when processing the backlight substrate 220, the end portion 221b of the first substrate 221 in the first direction D1 (see Fig.11 ) may have a protruding structure (not shown). Due to the burrs protruding toward the back side of the backlight substrate 220, a separation space may be formed between the rear plate 240 and the backlight substrate 220.

[0153] In order to provide a space for burr placement, a second protrusion 242 protruding toward the back side may be further included between the first protrusion 241 and the substrate seating portion 243. Figure 8 As shown in the right enlarged perspective view of FIG. 1 , the first protruding portion 241 , the second protruding portion 242 , the substrate seating portion 243 , and the second protruding portion 242 may be arranged in the order of the first protruding portion 241 , the second protruding portion 242 , and the substrate seating portion 243 .

[0154] Fig.11 FIG. 1 is a partial enlarged view of a backlight unit BLU according to an embodiment of the present invention. Fig.10 As shown, after the backlight substrate 220 is placed on the rear plate 240, an adhesive tape and a reflective plate 250 may be combined on the front side.

[0155] Reference Fig.11 , not only the backlight substrate 220 can be combined with the reflective plate 250 through the adhesive tape 230, but also the first protrusion 241 of the rear plate 240 can be combined with the reflective plate 250 through the adhesive tape 230. The height difference between the substrate seating portion 243 and the first protrusion 241 is formed to correspond to the thickness of the backlight substrate 220, so that the first protrusion 241 of the rear plate 240 and the backlight substrate 220 can be attached to the reflective plate 250 through the adhesive tape 230.

[0156] Fig.12 and Fig.13 2 is a diagram showing a method of combining the diffuser plate support member 270. The diffuser plate support member 270 of the present invention can be inserted into the fastening hole 244 of the rear plate 240 after combining the reflector 250, the backlight substrate 220 and the rear plate 240.

[0157] In addition to the light source hole 251 through which the light emitting device 227 is exposed, the reflective plate 250 may further include a support member hole 252 through which the fastening hole 244 and the fixing hole 245 of the rear plate 240 are exposed. Fig.12 As shown, the support hole 252 of the reflective plate 250 can be formed small to minimize the size so that only the fastening hole 244 and the fixing hole 245 are exposed. The adhesive tape 230 can also include a support hole 232, and the support hole 232 of the adhesive tape 230 can also be formed larger than the support hole 252 of the reflective plate 250.

[0158] The diffuser plate support 270 may include a support protrusion 271 contacting the bottom surface of the optical sheet layer 260 and a support hook 272 inserted into the fastening hole 244 of the rear plate 240. After the support hook 272 extends downward, a hook end 272e may be bent upward, and the hook end 272e may extend in the second direction D2 or a third direction D3 opposite to the second direction D2.

[0159] Fig.12The support hook 272 of the diffuser plate support 270 is shown to extend in the third direction D3. The plurality of diffuser plate supports 270 may be arranged such that the support hooks 272 face in opposite directions.

[0160] The lower end of the hook may have a flat surface to minimize the structure protruding toward the back side of the rear plate 240. The fastening hole 244 may have a size greater than the width of the supporter hook 272 in the second direction D2, and the supporter hook 272 may be inserted into the fastening hole 244.

[0161] An elastic portion 273 extending in the second direction D2 and the third direction D3 may be included between the support hook 272 and the support protrusion 271. The end of the elastic portion 273 may be bent toward the rear direction, and the end thereof may contact the front side of the reflection plate 250. The elastic portion 273 may include a pair of elastic portions extending in opposite directions relative to the support protrusion 271.

[0162] If the support protrusion 271 is pressed toward the back side, the elastic part 273 is deformed, and if the force is removed after the support protrusion 271 is pressed toward the back side, the support protrusion 271 can return to its original position. The elastic part 273 is configured to change the position of the support protrusion 271 in response to an external force, thereby preventing the optical sheet 260 contacting the end of the support protrusion 271 from being damaged by the support protrusion 271.

[0163] like Fig.13 As shown in (a) in the figure, the support protrusion 271 can be pressed toward the back side so that the support member hook 272 is inserted into the fastening hole 244, and the hook end 272e passes through the fastening hole 244 and remains located on the back side of the rear plate 240.

[0164] Then, if Fig.13 As shown in (b) in the figure, the diffuser plate support member 270 is pushed toward the third direction D3 in the direction of forming the support member hook 272 until the end of the support member hook 272 is located at the back side of the fixing hole 245 set in the third direction D3 of the fastening hole 244, and the force of the pressure support protrusion 271 is removed. Then, under the elastic action of the elastic part 273, the support protrusion 271 protrudes toward the front direction (the upper side in the figure), and the hook end 272e can be inserted into the fixing hole 245.

[0165] A distance d2 between the third direction D3 end of the fastening hole 244 and the third direction D3 end of the fixing hole 245 may be set to correspond to the interval d1 between the hook end 272 e and the extension 272 a located below the support protrusion 271 of the support member hook 272 .

[0166] The fixing hole 245 may have a size corresponding to that of the hook end 272 e of the supporter hook 272 so that the hook end 272 e of the supporter hook 272 can be inserted and fixed, and may have a relatively smaller size than the fastening hole 244 .

[0167] The support hook 272 is fastened to the rear plate 240 , and the elastic portion 273 is in contact with the front surface of the reflection plate 250 , thereby playing a role in fastening the reflection plate 250 and the rear plate 240 .

[0168] The direction of the force applied to the diffuser plate support 270 may be different depending on the extension direction of the hook end 272e of the support hook 272. When the support hook 272 is bent in the third direction, if the support protrusion 271 of the diffuser plate support 270 is pressed from the upper side, it may be inclined in the second direction D2. In order to enhance the rigidity in the second direction D2, the length B of the elastic portion 273b in the second direction may be configured to be smaller than the length A of the elastic portion 273a in the third direction D3 (A>B).

[0169] In the backlight substrate 220 of the present invention, since the area of ​​the substrate is reduced to half, the component cost is reduced, and it is open in the front-back direction, which is conducive to dissipating the heat generated by the light source.

[0170] The backlight unit BLU of the present invention can reduce manufacturing costs while ensuring rigidity.

[0171] In addition, since the hole for facilitating the combination with the bottom cover is included, the fastening can improve the convenience of the assembly process.

[0172] The above detailed description should not be interpreted as limiting in all aspects, but should be considered as illustrative. The scope of the present invention should be determined according to the reasonable interpretation of the appended claims, and all changes made within the equivalent scope of the present invention are included in the scope of the present invention.

Claims

1. A backlight unit, wherein: include: A backlight substrate, comprising a plurality of first substrates and a second substrate, wherein the plurality of first substrates are arranged at predetermined intervals along a first direction and extend along a second direction perpendicular to the first direction, and the second substrate is connected to the plurality of first substrates; A plurality of light emitting devices are arranged at predetermined intervals on the front surface of the backlight substrate; A rear plate, comprising a substrate placement portion and a first protruding portion, wherein the substrate placement portion is used for placing the back side of the backlight substrate, and the first protruding portion is located between the first substrates and protrudes forward; A reflector, located on the front side of the backlight substrate; as well as An adhesive tape is located between the backlight substrate and the reflective plate to attach the backlight substrate and the first protruding portion of the rear plate to the reflective plate.

2. The backlight unit according to claim 1, characterized in that: The adhesive tape and the reflective plate include light source holes formed at positions corresponding to the light emitting devices.

3. The backlight unit according to claim 1, characterized in that: A height difference between the first protrusion of the rear plate and the substrate seating portion corresponds to a height of the backlight substrate.

4. The backlight unit according to claim 1, characterized in that: The device further includes a second protruding portion, which is located between the substrate seating portion and the first protruding portion and protrudes toward the back side compared to the substrate seating portion.

5. The backlight unit according to claim 1, characterized in that: The interval between the first substrates corresponds to the length of the first substrate in the first direction. The second substrate is located at one end portion of the first substrate in the second direction.

6. The backlight unit according to claim 1, characterized in that: A diffusion plate support is also included, and the diffusion plate support is located between the first substrates and is fastened to the rear plate.

7. The backlight unit according to claim 6, characterized in that: The diffusion plate support is coupled to a fastening hole formed at the first protrusion.

8. The backlight unit according to claim 7, characterized in that: The diffuser plate support comprises: The support is raised and protrudes forward; a support member hook extending toward the back side of the support protrusion and inserted into the fastening hole of the first protrusion; and The elastic part extends toward the side direction of the supporting protrusion, and the end of the elastic part contacts the top surface of the reflecting plate.

9. The backlight unit according to claim 8, characterized in that: The support member hook includes an end portion bent toward one side of the second direction and a third direction opposite to the second direction, The rear plate includes a fixing hole adjacent to the fastening hole and into which an end of the supporter hook is inserted.

10. A display device, wherein: include: LCD panel; An optical sheet layer, located on the back of the liquid crystal panel; as well as A backlight unit is located on the back of the optical sheet layer. The backlight unit comprises: A backlight substrate, comprising a plurality of first substrates and a second substrate, wherein the plurality of first substrates are arranged at predetermined intervals along a first direction and extend along a second direction perpendicular to the first direction, and the second substrate is connected to the plurality of first substrates; A plurality of light emitting devices are arranged at predetermined intervals on the front surfaces of the first substrate and the second substrate; A rear plate, comprising a substrate placement portion and a first protruding portion, wherein the substrate placement portion is used for placing the back side of the backlight substrate, and the first protruding portion is located between the first substrates and protrudes forward; A reflective plate, located on the front side of the backlight substrate; and The adhesive tape is located between the backlight substrate and the reflective plate, so that the backlight substrate and the first protruding portion of the rear plate are attached to the reflective plate.

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