Backlight unit and display apparatus including same

Abstract

This display apparatus comprises a liquid crystal panel and a backlight unit which provides light to the liquid crystal panel. The backlight unit comprises: a substrate; a red light-emitting diode provided to be mounted on one surface of the substrate; a green light-emitting diode provided to be mounted on the one surface of the substrate; and a blue light-emitting diode provided to be mounted on the one surface of the substrate. Each of the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode includes at least two cells.

Description

Backlight unit and display device including the same

[0001] The present disclosure relates to a display device comprising a backlight unit.

[0002] A display device is a type of output device that converts acquired or stored electrical information into visual information and displays it to a user.

[0003] The display device may include a backlight unit that provides light to a liquid crystal panel. The backlight unit includes a plurality of point light-emitting elements capable of emitting light independently. The light-emitting elements may include light-emitting diodes (LEDs).

[0004] A display device can improve the contrast ratio and power efficiency of the screen through a local dimming system of a backlight unit. The local dimming system divides the screen of the display device into multiple zones and can independently adjust the amount of current for each zone according to the input image. The local dimming system can effectively improve the contrast ratio by lowering the amount of current when the input image is dark and increasing the amount of current when the input image is bright.

[0005] Since red, green, and blue light-emitting diodes each have different driving voltages, voltage loss may occur when each block of a local dimming system containing them is driven by a common voltage.

[0006] One aspect of the present disclosure provides a display device that improves the lifespan and color stability of a light-emitting diode through high voltage and low current driving of the light-emitting diode.

[0007] One aspect of the present disclosure provides a display device capable of reducing voltage loss while supplying a common voltage to a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode.

[0008] One aspect of the present disclosure provides a display device in which, among a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode forming a group of light-emitting diodes, the number of cells of the red light-emitting diode is greater than the number of cells of the green light-emitting diode and the number of cells of the blue light-emitting diode.

[0009] One aspect of the present disclosure provides a display device comprising a light-emitting diode in which at least one cell is disposed between an anode pad and a cathode pad.

[0010] The technical problems to be solved in this document are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this invention belongs from the description below.

[0011] A display device according to the present disclosure includes a liquid crystal panel and a backlight unit provided to provide light to the liquid crystal panel. The backlight unit includes a substrate, a red light-emitting diode provided to be mounted on one side of the substrate, a green light-emitting diode provided to be mounted on the one side of the substrate, and a blue light-emitting diode provided to be mounted on the one side of the substrate. The red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode each include at least two cells.

[0012] A display device according to the present disclosure includes a liquid crystal panel and a backlight unit provided to provide light to the liquid crystal panel. The backlight unit includes a substrate comprising an insulating layer and a conductive layer, a light-emitting diode provided to be mounted on the substrate and comprising a first pad provided to correspond to an anode and a second pad provided to correspond to a cathode, a first power supply pad provided to connect an anode to the first pad as a part of the conductive layer, and a second power supply pad provided to connect a cathode to the second pad as a part of the conductive layer. The light-emitting diode includes at least one cell disposed between the first pad and the second pad.

[0013] FIG. 1 illustrates a display device according to one embodiment.

[0014] FIG. 2 illustrates a disassembled display device according to one embodiment.

[0015] FIG. 3 illustrates a cross-section of a liquid crystal panel of a display device according to one embodiment.

[0016] FIG. 4 illustrates a backlight unit according to one embodiment in disassembly.

[0017] FIG. 5 is a plan view of a light source module to explain the concept of a dimming block in a backlight unit according to one embodiment.

[0018] Fig. 6 is an enlarged perspective view of A in Fig. 5.

[0019] Figure 7 illustrates the light source shown in Figure 6 in disassembled form.

[0020] FIG. 8 schematically illustrates dimming blocks according to one embodiment.

[0021] FIG. 9 conceptually illustrates the interior of each light-emitting diode in a group of light-emitting diodes according to one embodiment.

[0022] FIG. 10 is a diagram illustrating the connection wiring of a power assembly and light-emitting diodes according to one embodiment.

[0023] FIG. 11 is a drawing for explaining the connection wiring of a power assembly and light-emitting diodes according to one embodiment.

[0024] FIG. 12 conceptually illustrates the interior of each light-emitting diode in a group of light-emitting diodes according to one embodiment.

[0025] FIG. 13 conceptually illustrates the interior of each light-emitting diode in a group of light-emitting diodes according to one embodiment.

[0026] FIG. 14 conceptually illustrates the interior of each light-emitting diode in a group of light-emitting diodes according to one embodiment.

[0027] FIG. 15 illustrates a light-emitting diode comprising two cells in a display device according to one embodiment.

[0028] FIG. 16 illustrates a light-emitting diode comprising three cells in a display device according to one embodiment.

[0029] FIG. 17 illustrates a light-emitting diode comprising four cells in a display device according to one embodiment.

[0030] FIG. 18 illustrates a light-emitting diode comprising five cells in a display device according to one embodiment.

[0031] FIG. 19 illustrates a light-emitting diode comprising eight cells in a display device according to one embodiment.

[0032] FIG. 20 illustrates a light-emitting diode comprising eight cells in a display device according to one embodiment.

[0033] FIG. 21 illustrates a light-emitting diode comprising six cells in a display device according to one embodiment.

[0034] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and various modifications that may replace the embodiments and drawings of this specification may exist at the time of filing this application.

[0035] Additionally, the same reference numerals or symbols presented in each drawing of this specification represent parts or components that perform substantially the same function.

[0036] Additionally, the singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.

[0037] Additionally, in this document, each of the phrases such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B, or C" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.

[0038] Additionally, the terms "part," "module," and "component" may be implemented in hardware or software. Depending on the embodiments, a plurality of "parts," "modules," and "components" may be implemented as a single component, or a single "part," "module," or "component" may include a plurality of components.

[0039] Furthermore, the terms used in this specification are for describing embodiments and are not intended to limit or / or restrict the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0040] Additionally, terms including ordinal numbers, such as "first," "second," etc., used herein may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any one of a plurality of related described items.

[0041] Where any (e.g., 1st) component is referred to as "coupled" or "connected" to another (e.g., 2nd) component, with or without the terms "functionally" or "communicationly," it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0042] When it is said that a component is "connected," "combined," "supported," or "in contact" with another component, this includes not only cases where the components are directly connected, combined, supported, or in contact, but also cases where they are indirectly connected, combined, supported, or in contact through a third component.

[0043] When it is said that a component is located "on" another component, this includes not only cases where one component is in contact with the other, but also cases where another component exists between the two components.

[0044] Meanwhile, terms such as "up / down direction" and "front / back direction" used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms. For example, the terms "front" and "rear" below may refer to the +X direction and -X direction, respectively, as depicted in the drawings. The terms "up" and "down" below may refer to the +Z direction and -Z direction, respectively, as depicted in the drawings. The terms "left direction" and "right direction" below may refer to the +Y direction and -Y direction, respectively, as depicted in the drawings. The term "vertical direction" below may refer to the Z direction, respectively, as depicted in the drawings, and the term "horizontal direction" below may refer to the Y direction, respectively, as depicted in the drawings. However, in some drawings, the +X direction may be referred to as "up" and the -X direction may be referred to as "down."

[0045] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0046] FIG. 1 illustrates a display device according to one embodiment. FIG. 2 illustrates a disassembled display device according to one embodiment. FIG. 3 illustrates a cross-section of a liquid crystal panel of a display device according to one embodiment.

[0047] Referring to FIG. 1, the display device (10) is a device capable of processing a video signal received from the outside and visually displaying the processed video. In the following examples, the display device (10) is exemplified as a television (TV), but is not limited thereto. For example, the display device (10) can be implemented in various forms such as a monitor, a portable multimedia device, a portable communication device, etc., and the form of the display device (10) is not limited as long as it is a device that visually displays video.

[0048] In addition, the display device (10) may be a large format display (LFD) installed outdoors, such as on a building rooftop or at a bus stop. Here, the outdoor area is not necessarily limited to an open space; the display device (10) according to one embodiment may be installed in any indoor location where many people can enter and exit, such as a subway station, shopping mall, movie theater, company, or store.

[0049] A display device (10) can receive content data including video data and audio data from various content sources and output video and audio corresponding to the video data and audio data. For example, the display device (10) can receive content data through a broadcast receiving antenna or a wired cable, receive content data from a content playback device, or receive content data from a content provider's content provision server.

[0050] As illustrated in FIG. 1, the display device (10) includes a main body (11), a screen (12) for displaying an image (I), and a support (17) provided at the bottom of the main body (11) to support the main body (10).

[0051] The main body (11) forms the outer shape of the display device (10), and components for the display device (10) to display an image (I) or perform various functions may be provided inside the main body (11). The main body (11) shown in FIG. 1 is in the shape of a flat plate, but the shape of the main body (11) is not limited to that shown in FIG. 1. For example, the main body (11) may be in the shape of a curved plate.

[0052] A screen (12) is formed on the front of the main body (11) and can display an image (I). For example, the screen (12) can display a still image or a video. Additionally, the screen (12) can display a two-dimensional planar image or a three-dimensional stereoscopic image using the parallax of the user's two eyes.

[0053] A plurality of pixels (P) are formed on the screen (12), and an image (I) displayed on the screen (12) can be formed by light emitted by each of the plurality of pixels (P). For example, an image (I) can be formed on the screen (12) by combining the light emitted by the plurality of pixels (P) as if in a mosaic.

[0054] Each of the plurality of pixels (P) can emit light of various brightness and various colors. For example, each of the plurality of pixels (P) may include a self-emissive panel (e.g., a light-emitting diode panel) capable of emitting light directly, or a non-emissive panel (e.g., a liquid crystal panel) capable of passing through or blocking light emitted by a backlight unit, etc.

[0055] In order to emit light of various colors, each of the plurality of pixels (P) may include subpixels such as a red subpixel (PR), a green subpixel (PG), and a blue subpixel (PB).

[0056] The subpixels may include a red subpixel (PR) capable of emitting red light, a green subpixel (PG) capable of emitting green light, and a blue subpixel (PB) capable of emitting blue light. For example, red light may represent light with a wavelength of approximately 620 nm (nanometer, one-billionth of a meter) to 750 nm, green light may represent light with a wavelength of approximately 495 nm to 570 nm, and blue light may represent light with a wavelength of approximately 450 nm to 495 nm.

[0057] By combining the red light of the red subpixel (PR), the green light of the green subpixel (PG), and the blue light of the blue subpixel (PB), light of various brightness and various colors can be emitted from each of the multiple pixels (P).

[0058] As shown in FIG. 2, various components for generating an image (I) on a screen (12) may be provided inside the main body (11).

[0059] For example, the main body (11) may be provided with a backlight unit (100) which is a surface light source, a liquid crystal panel (20) that blocks or passes light emitted from the backlight unit (100), a control assembly (50) that controls the operation of the backlight unit (100) and the liquid crystal panel (20), and a power assembly (60) that supplies power to the backlight unit (100) and the liquid crystal panel (20). Additionally, the main body (11) may include a bezel (13) for supporting and fixing the liquid crystal panel (20), the backlight unit (100), the control assembly (50), and the power assembly (60), a frame middle mold (14), a bottom chassis (15), and a rear cover (16).

[0060] The backlight unit (100) may include a point light source that emits monochromatic light or white light, and may diffuse, refract, reflect, and scatter the light emitted from the point light source to convert it into uniform surface light. For example, the backlight unit (100) may include a plurality of light sources that emit monochromatic light or white light, a diffuser plate that diffuses light incident from the plurality of light sources, a reflector sheet that reflects light emitted from the rear of the plurality of light sources and the diffuser plate, and an optical sheet that refracts and scatters light emitted from the front of the diffuser plate.

[0061] In this way, the backlight unit (100) can emit uniform surface light toward the front by diffusing, refracting, reflecting, and scattering light emitted from a light source.

[0062] The configuration of the backlight unit (100) is described in more detail below.

[0063] A liquid crystal panel (20) may be provided in front of a backlight unit (100). The liquid crystal panel (20) may block or allow light emitted from the backlight unit (100) to form an image (I).

[0064] The front surface of the liquid crystal panel (20) forms the screen (12) of the display device (10) described above, and the liquid crystal panel (20) may include a plurality of pixels (P). The liquid crystal panel (20) can control the plurality of pixels (P) to each independently block or pass light from the backlight unit (100). The light passed by the plurality of pixels (P) can form an image (I) displayed on the screen (12).

[0065] For example, as shown in FIG. 3, the liquid crystal panel (20) may include a first polarizing film (21), a first transparent substrate (22), a pixel electrode (23), a thin film transistor (24), a liquid crystal layer (25), a common electrode (26), a color filter (27), a second transparent substrate (28), and a second polarizing film (29).

[0066] The first transparent substrate (22) and the second transparent substrate (28) can fix and support a pixel electrode (23), a thin-film transistor (24), a liquid crystal layer (25), a common electrode (26), and a color filter (27). These first and second transparent substrates (22, 28) may be composed of reinforced glass or a transparent resin.

[0067] A first polarizing film (21) and a second polarizing film (29) are provided on the outer side of the first and second transparent substrates (22, 28).

[0068] The first polarizing film (21) and the second polarizing film (29) can each allow specific light to pass through and block other light. For example, the first polarizing film (21) can allow light having a magnetic field vibrating in a first direction to pass through and block other light. Additionally, the second polarizing film (29) can allow light having a magnetic field vibrating in a second direction to pass through and block other light. At this time, the first direction and the second direction can be orthogonal to each other. Accordingly, the polarization direction of the light passed through by the first polarizing film (21) and the vibration direction of the light passed through the second polarizing film (29) are orthogonal to each other. As a result, light generally cannot pass through the first polarizing film (21) and the second polarizing film (29) simultaneously.

[0069] A color filter (27) may be provided on the inner side of the second transparent substrate (28).

[0070] The color filter (27) may include, for example, a red filter (27R) that passes red light, a green filter (27G) that passes green light, and a blue filter (27G) that passes blue light, and the red filter (27R), the green filter (27G), and the blue filter (27B) may be arranged side by side. The area where the color filter (27) is formed corresponds to the pixel (P) described above. The area where the red filter (27R) is formed corresponds to the red subpixel (PR), the area where the green filter (27G) is formed corresponds to the green subpixel (PG), and the area where the blue filter (27B) is formed corresponds to the blue subpixel (PB).

[0071] A pixel electrode (23) may be provided on the inner side of the first transparent substrate (22), and a common electrode (26) may be provided on the inner side of the second transparent substrate (28).

[0072] The pixel electrode (23) and the common electrode (26) are made of an electrically conductive metal material and can generate an electric field to change the arrangement of liquid crystal molecules (115a) constituting the liquid crystal layer (25) described below.

[0073] The pixel electrode (23) and the common electrode (26) are made of a transparent material and can pass light incident from the outside. For example, the pixel electrode (23) and the common electrode (26) may be made of indium tin oxide (ITO), indium zinc oxide (IZO), silver nanowire (Ag nano wire), carbon nanotube (CNT), graphene, or PEDOT (3,4-ethylenedioxythiophene).

[0074] A thin film transistor (TFT) (24) may be provided on the inner side of the second transparent substrate (22).

[0075] The thin-film transistor (24) can pass or block the current flowing through the pixel electrode (23). For example, depending on the turn-on (closed) or turn-off (open) of the thin-film transistor (24), an electric field can be formed or removed between the pixel electrode (23) and the common electrode (26).

[0076] The thin film transistor (24) can be made of polysilicon and can be formed by semiconductor processes such as lithography, deposition, and ion implantation.

[0077] A liquid crystal layer (25) is formed between the pixel electrode (23) and the common electrode (26), and the liquid crystal layer (25) can be filled with liquid crystal molecules (25a).

[0078] Liquid crystals represent an intermediate state between solids (crystals) and liquids. Most liquid crystal materials are organic compounds with molecular shapes resembling long, slender rods; while the arrangement of molecules appears irregular in some directions, it can take on a regular crystalline form in others. As a result, liquid crystals can possess both the fluidity of liquids and the optical anisotropy of crystals (solids).

[0079] In addition, the liquid crystal may exhibit optical properties depending on changes in the electric field. For example, the direction of the molecular arrangement constituting the liquid crystal may change depending on changes in the electric field. When an electric field is generated in the liquid crystal layer (25), the liquid crystal molecules (115a) of the liquid crystal layer (25) are arranged according to the direction of the electric field, and when no electric field is generated in the liquid crystal layer (25), the liquid crystal molecules (115a) may be arranged irregularly or along an alignment layer (not shown). As a result, the optical properties of the liquid crystal layer (25) may vary depending on the presence or absence of an electric field passing through the liquid crystal layer (25).

[0080] On one side of the liquid crystal panel (20), a cable (20a) for transmitting video data to the liquid crystal panel (20) and a display driver integrated circuit (DDI, 30) (hereinafter referred to as 'driver IC') for processing digital video data and outputting an analog video signal may be provided.

[0081] The cable (20a) electrically connects the control assembly (50) / power assembly (60) and the driver IC (30), and can also electrically connect the driver IC (30) and the liquid crystal panel (20). The cable (20a) may include a flexible flat cable or a film cable, etc.

[0082] The driver IC (30) receives image data and power from the control assembly (50) / power assembly (60) through the cable (20a) and can transmit image data and driving current to the liquid crystal panel (20) through the cable (20a).

[0083] Additionally, the cable (20a) and the driver IC (30) can be implemented as a single unit using a film cable, chip on film (COF), tape carrier packet (TCP), etc. In other words, the driver IC (30) can be placed on the cable (20a). However, it is not limited thereto, and the driver IC (30) can be placed on the liquid crystal panel (20).

[0084] The control assembly (50) may include a control circuit that controls the operation of the liquid crystal panel (20) and the backlight unit (100). The control circuit may process image data received from an external content source, transmit image data to the liquid crystal panel (20), and transmit dimming data to the backlight unit (100).

[0085] The power assembly (60) can supply power to the liquid crystal panel (20) and the backlight unit (100) so that the backlight unit (100) outputs surface light and the liquid crystal panel (20) blocks or passes the light of the backlight unit (100).

[0086] The control assembly (50) and the power assembly (60) may be implemented with a printed circuit board and various circuits mounted on the printed circuit board. For example, the power circuit may include a capacitor, a coil, a resistor, a processor, etc., and a power circuit board on which these are mounted. Additionally, the control circuit may include a memory, a processor, and a control circuit board on which these are mounted.

[0087] FIG. 4 illustrates a backlight unit according to one embodiment in disassembly.

[0088] The backlight unit (100) may include a light source module (110) that generates light, a reflective sheet (120) that reflects light, a diffuser plate (130) that diffuses light uniformly, and an optical sheet (140) that improves the brightness of the emitted light.

[0089] The light source module (110) may include a plurality of light sources (111) that emit light and a substrate (112) that supports or fixes the plurality of light sources (111).

[0090] Multiple light sources (111) can be arranged in a predetermined pattern so that light is emitted with uniform brightness. Multiple light sources (111) can be arranged so that the distance between one light source and adjacent light sources becomes equal.

[0091] For example, multiple light sources (111) can be arranged in rows and columns. In this way, multiple light sources can be arranged so that a square is formed by four adjacent light sources. Additionally, one light source is placed adjacent to four light sources, and the distance between one light source and the four adjacent light sources can be approximately the same.

[0092] As another example, multiple light sources can be arranged in multiple rows, and a light source belonging to each row can be placed in the center of two light sources belonging to an adjacent row. In this way, multiple light sources can be arranged so that an approximately equilateral triangle is formed by three adjacent light sources. In this case, one light source is placed adjacent to six light sources, and the distance between one light source and the six adjacent light sources can be approximately equal.

[0093] However, the pattern in which the multiple light sources (111) are arranged is not limited to the pattern described above, and the multiple light sources (111) can be arranged in various patterns so that light is emitted with uniform brightness.

[0094] The light source (111) may employ a device capable of emitting monochromatic light (light of a specific wavelength, e.g., blue light) or white light (e.g., light mixed with red, green, and blue light) in various directions when power is supplied. For example, the light source (111) may include a light-emitting diode (LED).

[0095] The substrate (112) can fix a plurality of light sources (111) so that the position of the light source (111) is not changed. In addition, the substrate (112) can supply power to each light source (111) for the light source (111) to emit light.

[0096] The substrate (112) may be composed of a synthetic resin, reinforced glass, or printed circuit board (PCB) having a conductive power supply line formed therein to fix a plurality of light sources (111) and to supply power to the light sources (111).

[0097] The reflective sheet (120) can reflect light emitted from a plurality of light sources (111) forward or in a direction close to the forward.

[0098] A plurality of through holes (120a) may be formed in the reflective sheet (120) at positions corresponding to each of the plurality of light sources (111) of the light source module (110). Additionally, the light source (111) of the light source module (110) may pass through the through holes (120a) and protrude forward from the reflective sheet (120).

[0099] For example, during the assembly process of the reflective sheet (120) and the light source module (110), a plurality of light sources (111) of the light source module (110) can be inserted into a plurality of through holes (120a) formed in the reflective sheet (120). As a result, the substrate (112) of the light source module (110) is located at the rear of the reflective sheet (120), but the plurality of light sources (111) of the light source module (110) can be located at the front of the reflective sheet (120).

[0100] With the above-described structure, a plurality of light sources (111) can emit light in front of the reflective sheet (120).

[0101] Multiple light sources (111) can emit light in various directions in front of the reflective sheet (120). The light can be emitted from the light source (111) toward the diffuser plate (130) as well as from the light source (111) toward the reflective sheet (120), and the reflective sheet (120) can reflect the light emitted toward the reflective sheet (120) toward the diffuser plate (130).

[0102] Light emitted from a light source (111) passes through various objects such as a diffuser plate (130) and an optical sheet (140). When light passes through the diffuser plate (130) and the optical sheet (140), some of the incident light may be reflected from the surface of the diffuser plate (130) and the optical sheet (140). A reflective sheet (120) can reflect the light reflected by the diffuser plate (130) and the optical sheet (140).

[0103] A diffuser plate (130) can be provided in front of the light source module (110) and the reflective sheet (120) and can evenly disperse light emitted from the light source (111) of the light source module (110).

[0104] The diffuser plate (130) can diffuse light emitted from a plurality of light sources (111) within the diffuser plate (130) to eliminate non-uniformity in brightness caused by a plurality of light sources (111) arranged spaced apart from each other. In other words, the diffuser plate (130) can uniformly emit the non-uniform light from the plurality of light sources (111) to the front.

[0105] The optical sheet (140) may include various sheets to improve brightness and uniformity of brightness. For example, the optical sheet (140) may include a diffusion sheet (141), a first prism sheet (142), a second prism sheet (143), a reflective polarizing sheet (144), etc. However, it is not limited thereto. The optical sheet (140) may include at least one of the diffusion sheet (141), the first prism sheet (142), the second prism sheet (143), and the reflective polarizing sheet (144).

[0106] The diffusion sheet (141) can diffuse light for uniform brightness. Light emitted from the light source (111) is diffused by the diffusion plate (130) and can be diffused again by the diffusion sheet (141) included in the optical sheet (140).

[0107] The first and second prism sheets (142, 143) can increase brightness by concentrating light diffused by the diffusion sheet (141). The first and second prism sheets (142, 143) include a prism pattern in the shape of a triangular prism, and a plurality of these prism patterns may be arranged adjacently to form a plurality of band shapes.

[0108] A reflective polarizing sheet (144) is a type of polarizing film that can transmit some of the incident light and reflect others to improve brightness. For example, it can transmit polarization in the same direction as a predetermined polarization direction of the reflective polarizing sheet (144) and reflect polarization in a direction different from the polarization direction of the reflective polarizing sheet (144). In addition, the light reflected by the reflective polarizing sheet (144) is recycled inside the backlight unit (100), and the brightness of the display device (10) can be improved through this light recycling.

[0109] The optical sheet (140) is not limited to the sheet or film shown in FIG. 4 and may include a wider variety of sheets or films, such as a protective sheet.

[0110] FIG. 5 is a plan view of a light source module to explain the concept of a dimming block in a backlight unit according to one embodiment. FIG. 6 is an enlarged perspective view of A in FIG. 5. FIG. 7 shows the light source illustrated in FIG. 6 in an exploded view.

[0111] The display device (10) according to the present disclosure can perform local dimming by varying the brightness of light in different areas of the backlight unit (100) in conjunction with the output image so as to improve power consumption while increasing the contrast ratio.

[0112] For example, the display device (10) may reduce the brightness of the light source (111) of the backlight unit (100) corresponding to the dark part of the image in order to make the dark part of the image darker. The display device (10) may increase the brightness of the light source (111) of the backlight unit (100) corresponding to the bright part of the image in order to make the bright part of the image brighter. By doing so, the contrast ratio or brightness ratio of the image may be improved.

[0113] The display device (10) can divide the light sources (111) of the backlight unit (100) into a plurality of blocks to perform the local dimming described above, and control the current flowing through each of the plurality of blocks. Hereinafter, each of the plurality of blocks described above is referred to as a dimming block (200). The display device (10) can independently control the current for each dimming block (200) according to the input image.

[0114] The display device (10) can effectively improve the contrast ratio by lowering the supply current to the dimming block (200) in the dark area of ​​the input image and increasing the supply current to the dimming block (200) in the bright area of ​​the input image.

[0115] As described above, a plurality of light sources (111) included in the backlight unit (100) can be divided into a plurality of dimming blocks (200). The plurality of dimming blocks (200) can be arranged in a matrix form on a substrate (112). For example, as shown in FIG. 5, the plurality of dimming blocks (200) can be configured with 5 rows and 12 columns, for a total of 60. However, the number of dimming blocks (200), the number of rows, and the number of columns are not limited to the above example.

[0116] A backlight unit (100) may include a plurality of dimming blocks (200), and each of the plurality of dimming blocks (200) may include at least one light source (111). The backlight unit (100) may supply the same driving current to light sources (111) belonging to the same dimming block (200). Light sources (111) belonging to the same dimming block (200) that receive the same driving current may emit light of the same brightness. However, as described below, if one light source (111) includes a red light-emitting diode (210R), a green light-emitting diode (210G), and a blue light-emitting diode (210B), the red light-emitting diodes (210R) connected in series within one dimming block (200) may emit light of the same brightness, the green light-emitting diodes (210G) connected in series may emit light of the same brightness, and the blue light-emitting diodes (210B) connected in series may emit light of the same brightness.

[0117] The backlight unit (100) can supply different driving currents to light sources (111) belonging to different dimming blocks (200) according to dimming data. Light sources (111) belonging to different dimming blocks (200) can emit light of different brightness. In other words, when the first dimming block and the second dimming block are supplied with different driving currents, the light sources belonging to the first dimming block and the light sources belonging to the second dimming block can emit light of different brightness. However, as described below, when one light source (111) includes a red light-emitting diode (210R), a green light-emitting diode (210G), and a blue light-emitting diode (210B), the red light-emitting diodes belonging to the first dimming block and the red light-emitting diodes belonging to the second dimming block may emit light of different brightness, the green light-emitting diodes belonging to the first dimming block and the green light-emitting diodes belonging to the second dimming block may emit light of different brightness, and the blue light-emitting diodes belonging to the first dimming block and the blue light-emitting diodes belonging to the second dimming block may emit light of different brightness.

[0118] Referring to FIG. 5, each of the plurality of dimming blocks (200) may include M*N light sources (111) arranged in the form of an M*N matrix (M and N are natural numbers). An M*N matrix means a matrix with M rows and N columns. According to one embodiment, each of the plurality of dimming blocks (200) may include 4 light sources (111) arranged in the form of a 2*2 matrix. The 4 light sources (111) constituting one dimming block (200) may be arranged to be turned ON or OFF simultaneously.

[0119] Referring to FIGS. 4 through 6, the light source module (110) may include a plurality of light sources (111). Each of the plurality of light sources (111) may pass through a through hole (120a) at the rear of the reflective sheet (120) and protrude toward the front of the reflective sheet (120). Accordingly, as shown in FIG. 6, a portion of the light source (111) and the substrate (112) may be exposed toward the front of the reflective sheet (120) through the through hole (120a).

[0120] The light source (111) may include an electrical / mechanical structure located in an area defined by a through hole (120a) of the reflective sheet (120).

[0121] Each of the plurality of light sources (111) may include at least one light-emitting diode (210) and an optical dome (220) provided to cover the at least one light-emitting diode (210).

[0122] According to one embodiment, each light source (111) may include three light-emitting diodes (210) and one optical dome (220) provided to cover them. In other words, the optical dome (220) may accommodate three light-emitting diodes (210) inside it. However, it is not limited thereto. Each light source may include two light-emitting diodes and one optical dome provided to cover them. Each light source may include one light-emitting diode and one optical dome provided to cover it.

[0123] Each light source (111) may include a group of light-emitting diodes (211). The group of light-emitting diodes (211) may refer to three light-emitting diodes (210R, 210G, 210B) arranged to be covered by an optical dome (220). The group of light-emitting diodes (211) may include a red light-emitting diode (210R) arranged to emit red light, a green light-emitting diode (210G) arranged to emit green light, and a blue light-emitting diode (210B) arranged to emit blue light. Each light source (111) may include a group of light-emitting diodes (211) and an optical dome (220) arranged to cover it.

[0124] As described above, each of the plurality of dimming blocks (200) may include four light sources (111) arranged in a 2x2 matrix form. Each dimming block (200) may include four groups of light-emitting diodes (211) arranged to be turned on or off simultaneously. Each light-emitting diode of the four groups of light-emitting diodes (211) may be connected in series with each other. Specifically, the red light-emitting diodes (210R) of the four groups of light-emitting diodes (211) may be connected in series with each other. The green light-emitting diodes (210G) of the four groups of light-emitting diodes (211) may be connected in series with each other. The blue light-emitting diodes (210B) of the four groups of light-emitting diodes (211) may be connected in series with each other.

[0125] The light-emitting diode (210) may include a P-type semiconductor and an N-type semiconductor for emitting light through the recombination of holes and electrons. Additionally, the light-emitting diode (210) may be provided with a pair of electrodes for supplying holes and electrons to the P-type semiconductor and the N-type semiconductor, respectively.

[0126] A light-emitting diode (210) can convert electrical energy into light energy. In other words, the light-emitting diode (210) can emit light having a maximum intensity at a predetermined wavelength to which power is supplied. For example, a blue light-emitting diode (210B) can emit blue light having a peak value at a wavelength that indicates blue (e.g., a wavelength between 450 nm and 495 nm).

[0127] The light-emitting diode (210) can be directly attached to the substrate (112) in a Chip On Board (COB) manner. In other words, the light source (111) may include a light-emitting diode (210) in which the light-emitting diode chip or light-emitting diode die is directly attached to the substrate (112) without separate packaging.

[0128] In order to improve the uniformity of surface light emitted by the backlight unit (100) and to improve the contrast ratio by local dimming, the number of light sources (111) may be increased. As a result, the area that each of the multiple light sources (111) can occupy may be narrowed.

[0129] In order to reduce the area of ​​the region occupied by each of the multiple light sources (111), a static discharge circuit (e.g., a Zener diode) that prevents or suppresses damage to the light-emitting diode (210) caused by electrostatic discharge may be omitted from the light source (111). In other words, the light source (111) may not include a Zener diode connected in parallel with the light-emitting diode (210).

[0130] In order to reduce the area occupied by the light-emitting diode (210), the light-emitting diode (210) may be manufactured as a flip-chip type that does not include a Zener diode. When attaching the light-emitting diode (210), which is a semiconductor device, to the substrate (112), the electrode pattern of the semiconductor device can be fused directly to the substrate (112) without using an intermediate medium such as a metal lead (wire) or a ball grid array (BGA).

[0131] In this way, as the metal lead (wire) or ball grid array is omitted, the light source (111) including the flip-chip type light-emitting diode (210) can be miniaturized.

[0132] To miniaturize the light source (111), a light source module (110) can be manufactured in which a flip-chip type light-emitting diode (210) is attached to a substrate (112) in a chip-on-board manner.

[0133] A feed line (230) and a feed pad (240) may be provided on the substrate (112) to supply power to a flip-chip type light-emitting diode (210).

[0134] A feed line (230) may be provided on the substrate (112) to supply electrical signals and / or power from the control assembly (50) and / or power assembly (60) to the light-emitting diode (210).

[0135] The substrate (112) can be formed by alternately stacking a non-conductive insulation layer (251) and a conductive conduction layer (252).

[0136] A line or pattern through which power and / or electrical signals pass is formed in the conductive layer (252). The conductive layer (252) may be composed of various materials having electrical conductivity. For example, the conductive layer (252) may be composed of various metal materials such as copper (Cu), tin (Sn), aluminum (Al), or alloys thereof.

[0137] The dielectric of the insulating layer (251) can insulate between the lines or patterns of the conductive layer (252). The insulating layer (251) may be composed of a dielectric for electrical insulation, for example, FR-4.

[0138] A protection layer (253) may be provided on the substrate (112) to prevent or suppress damage to the substrate (112) from external impact and / or damage from chemical action (e.g., corrosion, etc.) and / or damage from optical action.

[0139] A protective layer (253) may be provided to cover a first surface of a substrate (112) on which a light-emitting diode (210) is mounted. The protective layer (253) may include a photo solder resist (PSR). The protective layer (253) may be formed by applying a liquid photo solder resist (PSR) onto the substrate (112) and then curing it. The protective layer (253) may include a first window (253a) and a second window (253b). Hereinafter, the first surface of the substrate (112) may refer to the mounting surface of the substrate (112). The first surface of the substrate (112) may refer to the upper surface of the substrate (112) based on FIGS. 6 and FIGS. 7. The second surface of the substrate (112) may refer to the lower surface of the substrate (112) based on FIGS. 6 and FIGS. 7.

[0140] The power supply line (230) can be implemented by a line or pattern formed in the conductive layer (252). The power supply line (230) may refer to a portion of the conductive layer (252) laminated on the insulating layer (251).

[0141] The power supply pad (240) may be provided to be in contact with the light-emitting diode (210) as part of the conductive layer (252) laminated on the insulating layer (251). The power supply pad (240) may be connected to the power supply line (230). The power supply pad (240) may be connected to one end of the power supply line (230). The power supply pad (240) may point to one end of the power supply line (230).

[0142] The power supply pad (240) may include a first power supply pad (241) provided to apply a positive voltage to the light-emitting diode (210) and a second power supply pad (242) provided to apply a negative voltage to the light-emitting diode (210). Alternatively, the first power supply pad (241) may be provided to apply a negative voltage and the second power supply pad (242) may be provided to apply a positive voltage.

[0143] The power supply line (230) can be electrically connected to the light-emitting diode (210) through the power supply pad (240). At least a portion of the power supply pad (240) can be exposed to the outside through a first window (253a) formed in the protective layer (253). The power supply pad (240) and the light-emitting diode (210) can be electrically connected through at least a portion of the power supply pad (240) exposed to the outside through the first window (253a).

[0144] At least a portion of the first power supply pad (241) may be exposed to the outside through the first window (253a) of the protection layer (253). At least a portion of the second power supply pad (242) may be exposed to the outside through the first window (253a) of the protection layer (253). Through the first window (253a), the first power supply pad (241) may be electrically connected to the first pad of the light-emitting diode (210) to be described later. Through the first window (253a), the second power supply pad (242) may be electrically connected to the second pad of the light-emitting diode (210).

[0145] The protective layer (253) can cover the power supply line (230) to prevent the power supply line (230) from being exposed to the outside. The protective layer (253) can cover the remaining portion of the power supply pad (240) to prevent the remaining portion of the power supply pad (240), excluding the first window (253a), from being exposed to the outside. In other words, the protective layer (253) can expose at least a portion of the power supply pad (240) to the outside through the first window (253a) and cover the remaining portion of the power supply pad (240) and the power supply line (230).

[0146] A conductive adhesive material for electrical contact between the feed pad (240) and the electrode of the light-emitting diode (210) may be applied to at least a portion of the feed pad (240) exposed through the first window (253a). The conductive adhesive material may be applied to the feed pad (240) through the first window (253a) of the protective layer (253).

[0147] The electrode of the light-emitting diode (210) is in contact with a conductive adhesive material (211), and the light-emitting diode (210) can be electrically connected to a power supply line (230) through the conductive adhesive material (211). For example, the conductive adhesive material may include electrically conductive solder. However, it is not limited thereto, and the conductive adhesive material may include electrically conductive epoxy adhesives.

[0148] Power can be supplied to the light-emitting diode (210) through the power supply line (230) and the power supply pad (240), and when power is supplied, the light-emitting diode (210) can emit light. A pair of power supply pads (240) corresponding to each of a pair of electrodes provided in the flip-chip type light-emitting diode (210) may be provided.

[0149] The optical dome (220) can cover at least one light-emitting diode (210). According to one embodiment, the optical dome (220) can cover one group of light-emitting diodes (211). The group of light-emitting diodes (211) may include a red light-emitting diode (210R), a green light-emitting diode (210G), and a blue light-emitting diode (210B). The optical dome (220) may be configured to cover the red light-emitting diode (210R), the green light-emitting diode (210G), and the blue light-emitting diode (210B).

[0150] The optical dome (220) can prevent or suppress damage to the light-emitting diode (210) caused by external mechanical action and / or damage to the light-emitting diode (210) caused by chemical action. The optical dome (220) can prevent or suppress damage to the light-emitting diode group (211) caused by external mechanical action and / or damage to the light-emitting diode group (211) caused by chemical action.

[0151] According to one embodiment, the optical dome (220) may have a dome shape formed by cutting a sphere with a surface that does not include its center, or a hemispherical shape formed by cutting a sphere with a surface that includes its center. The vertical cross-section of the optical dome (220) may be, for example, arc-shaped or semicircular.

[0152] The optical dome (220) may be composed of silicone or epoxy resin. For example, molten silicone or epoxy resin may be discharged onto a light-emitting diode (210) through a nozzle, and then the discharged silicone or epoxy resin may be cured to form the optical dome (220).

[0153] Accordingly, the shape of the optical dome (220) can vary depending on the viscosity of the liquid silicone or epoxy resin. For example, if the optical dome (220) is manufactured using silicone with a thixotropic index of approximately 2.7 to 3.3 (preferably 3.0), the optical dome (220) can be formed with a dome ratio of approximately 2.5 to 3.1 (preferably 2.8), which represents the ratio of the height of the dome to the diameter of the bottom surface of the dome (height of the dome / diameter of the bottom surface). For example, the optical dome (220) manufactured by silicone with a thixotropic index of approximately 2.7 to 3.3 (preferably 3.0) may have a bottom surface diameter of approximately 2.5 mm and a height of approximately 0.7 mm.

[0154] The optical dome (220) may be optically transparent or translucent. Light emitted from the light-emitting diode (210) may pass through the optical dome (220) and be emitted to the outside.

[0155] At this time, the dome-shaped optical dome (220) can refract light like a lens. For example, light emitted from a light-emitting diode (210) can be dispersed by being refracted by the optical dome (220).

[0156] Thus, the optical dome (220) can not only protect the light-emitting diode (210) from external mechanical and / or chemical or electrical action, but also disperse the light emitted from the light-emitting diode (210).

[0157] The backlight unit (100) may include a static discharge member (260). The static discharge member (260) may be implemented by a line or pattern formed in the conductive layer (252). In other words, the static discharge member (260) may refer to a portion of the conductive layer (252) laminated on the insulating layer (251). The static discharge member (260) may be spaced apart from the power supply pad (240) and the power supply line (230) so as not to be connected to the power supply pad (240) and the power supply line (230).

[0158] The protective layer (253) can cover at least a portion of the static discharge member (260) to prevent at least a portion of the static discharge member (260) from being exposed to the outside. A portion of the static discharge member (260) may be exposed to the outside through the second window (253b) of the protective layer (253). The static discharge member (260) exposed to the outside through the second window (253b) can capture current caused by electrostatic discharge.

[0159] Referring to FIG. 7, a portion of the static discharge member (260) not covered by the protective layer (253) is called a static discharge pad. In other words, a portion of the static discharge member (260) exposed to the outside through the second window (253b) of the protective layer (253) is called a static discharge pad.

[0160] The static discharge member (260) may include a static discharge pad, which is a portion covered by a protective layer (253) and a portion not covered by the protective layer (253) and exposed to the outside. However, at least a portion of the static discharge pad covered by the protective layer (253) may be covered by a reflective sheet (120).

[0161] According to one embodiment, an antistatic member (260) may be provided near the optical dome (220) and the power supply line (230) to protect the light-emitting diode (210) from electrostatic discharge. More specifically, an antistatic pad may be provided near the optical dome (220) and the power supply line (230) to protect the light-emitting diode (210) from electrostatic discharge. The antistatic pad may absorb electrical shock caused by electrostatic discharge generated near the optical dome (220) and the power supply line (230).

[0162] The optical dome (220) can protect the light-emitting diode (111) from external electrical action. The optical dome (220) can prevent charges generated by electrostatic discharge from passing through the optical dome (220). The optical dome (220) can allow charges generated by electrostatic discharge to flow along the outer surface of the optical dome (220). Charges flowing along the outer surface of the optical dome (220) can reach the light-emitting diode (210) along the boundary between the optical dome (220) and the substrate (112). The light-emitting diode (210) may be damaged due to an electrical shock caused by charges penetrating along the boundary between the optical dome (220) and the substrate (112). To prevent or suppress such flow of charges, i.e., current, an anti-static pad may be provided near the optical dome (220).

[0163] The static discharge member (260) can provide a path for current from electrostatic discharge generated near the optical dome (220) and the power supply line (230). In other words, the static discharge member (260) can guide the charge from the electrostatic discharge to flow to ground.

[0164] Referring to FIGS. 6 and 7, the substrate (112) may be positioned parallel to the reflective sheet (120) such that the first surface faces the reflective sheet (120). The substrate (112) may include an insulating layer (251) and a conductive layer (252) laminated on the insulating layer (251). A portion of the first surface of the substrate (112) may be the insulating layer (251), and the remaining portion of the first surface of the substrate (112) may be the conductive layer (252). In other words, the insulating layer (251) may refer to a portion of the first surface. Likewise, the conductive layer (252) may refer to a portion of the first surface.

[0165] The power supply pad (240) may be part of the conductive layer (252). The power supply line (230) may be part of the conductive layer (252). The static discharge member (260) may be part of the conductive layer (252). In other words, the conductive layer (252) may include the power supply pad (240), the power supply line (230), and the static discharge member (260). The conductive layer (252) may include the power supply pad (240) and the power supply line (230) connected to each other, and the static discharge member (260) spaced apart from the power supply pad (240) and the power supply line (230) so as not to be connected to the power supply pad (240) and the power supply line (230).

[0166] FIG. 8 schematically illustrates dimming blocks according to one embodiment.

[0167] Referring to FIGS. 6 and FIGS. 8, a group of light-emitting diodes (211) may include a red light-emitting diode (210R), a green light-emitting diode (210G), and a blue light-emitting diode (210B). As described above, the three light-emitting diodes of a group of light-emitting diodes (211) may be covered by an optical dome (220).

[0168] Referring to FIG. 8, in a display device (1) according to one embodiment, one dimming block (200) may include four groups of light-emitting diodes. In other words, four groups of light-emitting diodes (211) may form one dimming block (200). However, it is not limited thereto. Each dimming block may include more than four groups of light-emitting diodes.

[0169] The light-emitting diodes of each dimming block (200) can be connected to be simultaneously turned ON or OFF. More specifically, the red light-emitting diodes (210R) of each dimming block (200) can be connected in series with each other. The green light-emitting diodes (210G) of each dimming block (200) can be connected in series with each other. The blue light-emitting diodes (210B) of each dimming block (200) can be connected in series with each other.

[0170] As described above, each group of light-emitting diodes (211) includes a red light-emitting diode (210R), a green light-emitting diode (210G), and a blue light-emitting diode (210B), thereby having a higher color purity and contrast ratio than a display device that includes only a single-color light-emitting diode.

[0171] FIG. 9 conceptually illustrates the interior of each light-emitting diode in a group of light-emitting diodes according to one embodiment.

[0172] Each light-emitting diode (210) of a display device (1) according to one embodiment may include at least three cells. Each light-emitting diode (210) may include at least one cell provided between a first pad provided to be electrically connected to a first power supply pad (241) and a second pad provided to be electrically connected to a second power supply pad (242).

[0173] Referring to FIG. 9, the red light-emitting diode (210R) of each light-emitting diode group (211) may include four cells (210R-1, 210R-2, 210R-3, 210R-4). The green light-emitting diode (210G) of each light-emitting diode group (211) may include three cells (210G-1, 210G-2, 210G-3). The blue light-emitting diode (210B) of each light-emitting diode group (211) may include three cells (210B-1, 210B-2, 210B-3).

[0174] According to one embodiment, the red light-emitting diode (210R) may include a first pad (241R) arranged to be electrically connected to a first feed pad (241) and a second pad (242R) arranged to be electrically connected to a second feed pad (242). The red light-emitting diode (210R) may include two cells (210R-2, 210R-3) disposed between the first pad (241R) and the second pad (242R). In this case, the length of the short side of each of the two cells (210R-2, 210R-3) disposed between the first pad (241R) and the second pad (242R) may be 100 μm or less.

[0175] According to one embodiment, the green light-emitting diode (210G) may include a third pad (241G) arranged to be electrically connected to a first feed pad (241) and a fourth pad (242G) arranged to be electrically connected to a second feed pad (242). The green light-emitting diode (210G) may include a cell (210G-2) disposed between the third pad (241G) and the fourth pad (242G). In this case, the length of the short side of the cell (210G-2) disposed between the third pad (241G) and the fourth pad (242G) may be 100 μm or less.

[0176] According to one embodiment, the blue light-emitting diode (210B) may include a fifth pad (241B) arranged to be electrically connected to a first feed pad (241) and a sixth pad (242B) arranged to be electrically connected to a second feed pad (242). The blue light-emitting diode (210B) may include a cell (210B-2) disposed between the fifth pad (241B) and the sixth pad (242B). In this case, the length of the short side of the cell (210B-2) disposed between the fifth pad (241B) and the sixth pad (242B) may be 100 μm or less.

[0177] The sizes of the red light-emitting diode (210R), the green light-emitting diode (210G), and the blue light-emitting diode (210B) constituting the light-emitting diode group (211) may not be the same as each other. For example, the size of the red light-emitting diode (210R) may be larger than the size of the green light-emitting diode (210G). The size of the red light-emitting diode (210R) may be larger than the size of the blue light-emitting diode (210B).

[0178] According to the present disclosure, in each of the plurality of light-emitting diode groups (211) forming a single dimming block (200), the magnitude of the voltage applied to the red light-emitting diode (210R), the magnitude of the voltage applied to the green light-emitting diode (210G), and the magnitude of the voltage applied to the blue light-emitting diode (210B) may be provided to be equal to each other. In other words, a common voltage may be applied to the single dimming block (200) regardless of the color of each light-emitting diode.

[0179] As described above, when driving light-emitting diodes by applying a common voltage, voltage loss may occur because the cell driving voltages of the red, green, and blue light-emitting diodes are different from each other. For example, the driving voltage of the four cells (210R-1, 210R-2, 210R-3, 210R-4) of the red light-emitting diode (210R) may each be 2 V. The driving voltage of the three cells (210G-1, 210G-2, 210G-3) of the green light-emitting diode (210G) may each be 2.5 V. The driving voltage of the three cells (210B-1, 210B-2, 210B-3) of the blue light-emitting diode (210B) may each be 2.75 V. However, the above driving voltages are theoretical values, and the actual driving voltages may differ from the above values.

[0180] Four cells (210R-1, 210R-2, 210R-3, 210R-4) containing a red light-emitting diode (210R) can be connected in series with each other through a bridge inside the red light-emitting diode (210R). Additionally, four red light-emitting diodes (210R) can be connected in series in one dimming block (200). Thus, the driving voltage of the red light-emitting diodes (210R) in one dimming block (200) can be 32 V.

[0181] Three cells (210G-1, 210G-2, 210G-3) containing a green light-emitting diode (210G) can be connected in series with each other through a bridge inside the green light-emitting diode (210G). Additionally, four green light-emitting diodes (210G) can be connected in series in one dimming block (200). Thus, the driving voltage of the green light-emitting diodes (210G) in one dimming block (200) can be 30 V.

[0182] Three cells (210B-1, 210B-2, 210B-3) containing a blue light-emitting diode (210B) can be connected in series with each other through a bridge inside the blue light-emitting diode (210B). Additionally, four blue light-emitting diodes (210B) can be connected in series in one dimming block (200). Thus, the driving voltage of the blue light-emitting diodes (210B) in one dimming block (200) can be 33 V.

[0183] As mentioned above, the actual driving voltage may differ slightly from the above value, but the fact that the driving voltage varies depending on the color of the light-emitting diode (210) remains unchanged. To apply a common voltage to a dimming block (200) composed of four groups of light-emitting diodes (211), 33 V, which is the driving voltage of the blue light-emitting diode (210B) having the highest driving voltage among the red, green, and blue light-emitting diodes, must be applied. In this case, since the red light-emitting diode (210R) requires a driving voltage of 32 V, a loss of 1 V occurs, and since the green light-emitting diode (210G) requires a driving voltage of 30 V, a loss of 3 V occurs. That is, a total loss of 4 V may occur. In reality, this voltage loss may be reduced further, and the voltage loss may be reduced compared to the case where the number of cells of the red, green, and blue light-emitting diodes is the same. Also, the voltage loss may be reduced compared to the case where the number of cells of each light-emitting diode is less than three.

[0184] A display device (1) according to one embodiment includes a red light-emitting diode (210R) having four cells, a green light-emitting diode (210G) having three cells, and a blue light-emitting diode (210B), thereby allowing voltage loss to be reduced while applying a common voltage to the dimming block. Additionally, driving efficiency can be increased by driving each light-emitting diode (210) with high voltage and low current. Furthermore, the lifespan and color stability of the light-emitting diodes can be improved by driving each light-emitting diode (210) with high voltage and low current.

[0185] FIG. 10 is a diagram illustrating the connection wiring of a power assembly and light-emitting diodes according to one embodiment.

[0186] As described above, each of the plurality of light-emitting diode groups (211) included in a single dimming block (200) may include a red light-emitting diode (210R), a green light-emitting diode (210G), and a blue light-emitting diode (210B). In this case, the plurality of light-emitting diodes may receive current from the same current supply line. That is, three current supply lines branched from a single current supply line connected to the power assembly (60) may each supply driving current to the red light-emitting diodes (210R), the green light-emitting diodes (210G), and the blue light-emitting diode (210B).

[0187] Referring to FIG. 10, a current supply line connected to the power assembly (60) may be connected to a current supply line that supplies driving current to red light-emitting diodes (210R). Likewise, a current supply line connected to the power assembly (60) may be connected to a current supply line that supplies driving current to green light-emitting diodes (210G). A current supply line connected to the power assembly (60) may be connected to a current supply line that supplies driving current to blue light-emitting diodes (210B).

[0188] The current supplied to the red light-emitting diode (210R) can be divided into four parts and flow to each cell (210R-1, 210R-2, 210R-3, 210R-4), the current supplied to the green light-emitting diode (210G) can be divided into three parts and flow to each cell (210G-1, 210G-2, 210G-3), and the current supplied to the blue light-emitting diode (210B) can be divided into three parts and flow to each cell (210B-1, 210B-2, 210B-3). Through this, each cell can be driven with a relatively low current, and the driving efficiency of the display device (1) can be improved.

[0189] FIG. 11 is a drawing for explaining the connection wiring of a power assembly and light-emitting diodes according to one embodiment.

[0190] Referring to FIG. 11, one of the three current supply lines connected to the power assembly (60) may be connected to a current supply line that supplies driving current to the red light-emitting diodes (210R). Another of the three current supply lines connected to the power assembly (60) may be connected to a current supply line that supplies driving current to the green light-emitting diodes (210G). The remaining of the three current supply lines connected to the power assembly (60) may be connected to a current supply line that supplies driving current to the blue light-emitting diodes (210B).

[0191] FIG. 12 conceptually illustrates the interior of each light-emitting diode in a group of light-emitting diodes according to one embodiment.

[0192] Referring to FIG. 12, the red light-emitting diode (210R) of each light-emitting diode group (211) according to one embodiment may include five cells (210R-1, 210R-2, 210R-3, 210R-4, 210R-5). The green light-emitting diode (210G) of each light-emitting diode group (211) may include four cells (210G-1, 210G-2, 210G-3, 210G-4). The blue light-emitting diode (210B) of each light-emitting diode group (211) may include four cells (210B-1, 210B-2, 210B-3, 210B-4).

[0193] According to one embodiment, the red light-emitting diode (210R) may include a first pad (241R) arranged to be electrically connected to a first feed pad (241) and a second pad (242R) arranged to be electrically connected to a second feed pad (242). The red light-emitting diode (210R) may include three cells (210R-2, 210R-3, 210R-4) disposed between the first pad (241R) and the second pad (242R). In this case, the length of the short side of each of the three cells (210R-2, 210R-3, 210R-4) disposed between the first pad (241R) and the second pad (242R) may be 100 μm or less.

[0194] According to one embodiment, the green light-emitting diode (210G) may include a third pad (241G) arranged to be electrically connected to a first feed pad (241) and a fourth pad (242G) arranged to be electrically connected to a second feed pad (242). The green light-emitting diode (210G) may include two cells (210G-2, 210G-3) disposed between the third pad (241G) and the fourth pad (242G). In this case, the length of the short side of the two cells (210G-2, 210G-3) disposed between the third pad (241G) and the fourth pad (242G) may be 100 μm or less.

[0195] According to one embodiment, the blue light-emitting diode (210B) may include a fifth pad (241B) arranged to be electrically connected to a first feed pad (241) and a sixth pad (242B) arranged to be electrically connected to a second feed pad (242). The blue light-emitting diode (210B) may include two cells (210B-2, 210B-3) disposed between the fifth pad (241B) and the sixth pad (242B). In this case, the length of the short side of the two cells (210B-2, 210B-3) disposed between the fifth pad (241B) and the sixth pad (242B) may be 100 μm or less.

[0196] The sizes of the red light-emitting diode (210R), the green light-emitting diode (210G), and the blue light-emitting diode (210B) constituting the light-emitting diode group (211) may not be the same as each other. For example, the size of the red light-emitting diode (210R) may be larger than the size of the green light-emitting diode (210G). The size of the red light-emitting diode (210R) may be larger than the size of the blue light-emitting diode (210B).

[0197] According to the present disclosure, in each of the plurality of light-emitting diode groups (211) forming a single dimming block (200), the magnitude of the voltage applied to the red light-emitting diode (210R), the magnitude of the voltage applied to the green light-emitting diode (210G), and the magnitude of the voltage applied to the blue light-emitting diode (210B) may be provided to be equal to each other. In other words, a common voltage may be applied to the single dimming block (200) regardless of the color of each light-emitting diode.

[0198] As described above, when driving light-emitting diodes by applying a common voltage, voltage loss may occur because the cell driving voltages of the red, green, and blue light-emitting diodes are different from each other. For example, the driving voltage of the five cells (210R-1, 210R-2, 210R-3, 210R-4, 210R-5) of the red light-emitting diode (210R) may each be 2 V. The driving voltage of the four cells (210G-1, 210G-2, 210G-3, 210G-4) of the green light-emitting diode (210G) may each be 2.5 V. The driving voltage of the four cells (210B-1, 210B-2, 210B-3, 210B-4) of the blue light-emitting diode (210B) may each be 2.75 V. However, the above driving voltage is a theoretical value, and the actual driving voltage may differ from the above value.

[0199] Five cells (210R-1, 210R-2, 210R-3, 210R-4, 210R-5) containing a red light-emitting diode (210R) can be connected in series with each other through a bridge inside the red light-emitting diode (210R). Additionally, four red light-emitting diodes (210R) can be connected in series in one dimming block (200). Thus, the driving voltage of the red light-emitting diodes (210R) in one dimming block (200) can be 40 V.

[0200] Four cells (210G-1, 210G-2, 210G-3, 210G-4) containing a green light-emitting diode (210G) can be connected in series with each other through a bridge inside the green light-emitting diode (210G). Additionally, four green light-emitting diodes (210G) can be connected in series in one dimming block (200). Thus, the driving voltage of the green light-emitting diodes (210G) in one dimming block (200) can be 40 V.

[0201] Four cells (210B-1, 210B-2, 210B-3, 210B-4) containing a blue light-emitting diode (210B) can be connected in series with each other through a bridge inside the blue light-emitting diode (210B). Additionally, four blue light-emitting diodes (210B) can be connected in series in one dimming block (200). Thus, the driving voltage of the blue light-emitting diodes (210B) in one dimming block (200) can be 44 V.

[0202] As mentioned above, the actual driving voltage may differ slightly from the above value, but the fact that the driving voltage varies depending on the color of the light-emitting diode (210) remains unchanged. To apply a common voltage to a dimming block (200) composed of four groups of light-emitting diodes (211), 44 V, which is the driving voltage of the blue light-emitting diode (210B) having the highest driving voltage among the red, green, and blue light-emitting diodes, must be applied. In this case, since the red light-emitting diode (210R) requires a driving voltage of 40 V, a loss of 4 V occurs, and since the green light-emitting diode (210G) requires a driving voltage of 40 V, a loss of 4 V occurs. That is, a total loss of 8 V may occur. In reality, this voltage loss may be reduced further, and the voltage loss may also be reduced compared to the case where the number of cells of the red, green, and blue light-emitting diodes is the same.

[0203] A display device (1) according to one embodiment includes a red light-emitting diode (210R) having five cells, a green light-emitting diode (210G) having four cells, and a blue light-emitting diode (210B), thereby allowing voltage loss to be reduced while applying a common voltage to the dimming block. Additionally, driving efficiency can be increased by driving each light-emitting diode (210) with high voltage and low current. Furthermore, the lifespan and color stability of the light-emitting diodes can be improved by driving each light-emitting diode (210) with high voltage and low current.

[0204] FIG. 13 conceptually illustrates the interior of each light-emitting diode in a group of light-emitting diodes according to one embodiment.

[0205] Referring to FIG. 13, the red light-emitting diode (210R) of each light-emitting diode group (211) according to one embodiment may include four cells (210R-1, 210R-2, 210R-3, 210R-4). The green light-emitting diode (210G) of each light-emitting diode group (211) may include three cells (210G-1, 210G-2, 210G-3). The blue light-emitting diode (210B) of each light-emitting diode group (211) may include two cells (210B-1, 210B-2).

[0206] According to one embodiment, the red light-emitting diode (210R) may include a first pad (241R) arranged to be electrically connected to a first feed pad (241) and a second pad (242R) arranged to be electrically connected to a second feed pad (242). The red light-emitting diode (210R) may include two cells (210R-2, 210R-3) disposed between the first pad (241R) and the second pad (242R). In this case, the length of the short side of each of the two cells (210R-2, 210R-3) disposed between the first pad (241R) and the second pad (242R) may be 100 μm or less.

[0207] According to one embodiment, the green light-emitting diode (210G) may include a third pad (241G) arranged to be electrically connected to a first feed pad (241) and a fourth pad (242G) arranged to be electrically connected to a second feed pad (242). The green light-emitting diode (210G) may include a cell (210G-2) disposed between the third pad (241G) and the fourth pad (242G). In this case, the length of the short side of the cell (210G-2) disposed between the third pad (241G) and the fourth pad (242G) may be 100 μm or less.

[0208] According to one embodiment, the blue light-emitting diode (210B) may include a fifth pad (241B) arranged to be electrically connected to a first feed pad (241) and a sixth pad (242B) arranged to be electrically connected to a second feed pad (242). The blue light-emitting diode (210B) may not include a cell disposed between the fifth pad (241B) and the sixth pad (242B).

[0209] The sizes of the red light-emitting diode (210R), the green light-emitting diode (210G), and the blue light-emitting diode (210B) constituting the light-emitting diode group (211) may not be the same as each other. For example, the size of the red light-emitting diode (210R) may be larger than the size of the green light-emitting diode (210G). The size of the red light-emitting diode (210R) may be larger than the size of the blue light-emitting diode (210B).

[0210] According to the present disclosure, in each of the plurality of light-emitting diode groups (211) forming a single dimming block (200), the magnitude of the voltage applied to the red light-emitting diode (210R), the magnitude of the voltage applied to the green light-emitting diode (210G), and the magnitude of the voltage applied to the blue light-emitting diode (210B) may be provided to be equal to each other. In other words, a common voltage may be applied to the single dimming block (200) regardless of the color of each light-emitting diode.

[0211] FIG. 14 conceptually illustrates the interior of each light-emitting diode in a group of light-emitting diodes according to one embodiment.

[0212] Referring to FIG. 14, the red light-emitting diode (210R) of each light-emitting diode group (211) according to one embodiment may include five cells (210R-1, 210R-2, 210R-3, 210R-4, 210R-5). The green light-emitting diode (210G) of each light-emitting diode group (211) may include four cells (210G-1, 210G-2, 210G-3, 210G-4). The blue light-emitting diode (210B) of each light-emitting diode group (211) may include three cells (210B-1, 210B-2, 210B-3).

[0213] According to one embodiment, the red light-emitting diode (210R) may include a first pad (241R) arranged to be electrically connected to a first feed pad (241) and a second pad (242R) arranged to be electrically connected to a second feed pad (242). The red light-emitting diode (210R) may include three cells (210R-2, 210R-3, 210R-4) disposed between the first pad (241R) and the second pad (242R). In this case, the length of the short side of each of the three cells (210R-2, 210R-3, 210R-4) disposed between the first pad (241R) and the second pad (242R) may be 100 μm or less.

[0214] According to one embodiment, the green light-emitting diode (210G) may include a third pad (241G) arranged to be electrically connected to a first feed pad (241) and a fourth pad (242G) arranged to be electrically connected to a second feed pad (242). The green light-emitting diode (210G) may include two cells (210G-2, 210G-3) disposed between the third pad (241G) and the fourth pad (242G). In this case, the length of the short side of the two cells (210G-2, 210G-3) disposed between the third pad (241G) and the fourth pad (242G) may be 100 μm or less.

[0215] According to one embodiment, the blue light-emitting diode (210B) may include a fifth pad (241B) arranged to be electrically connected to a first feed pad (241) and a sixth pad (242B) arranged to be electrically connected to a second feed pad (242). The blue light-emitting diode (210B) may include a cell (210B-2) disposed between the fifth pad (241B) and the sixth pad (242B). In this case, the length of the short side of the cell (210B-2) disposed between the fifth pad (241B) and the sixth pad (242B) may be 100 μm or less.

[0216] The sizes of the red light-emitting diode (210R), the green light-emitting diode (210G), and the blue light-emitting diode (210B) constituting the light-emitting diode group (211) may not be the same as each other. For example, the size of the red light-emitting diode (210R) may be larger than the size of the green light-emitting diode (210G). The size of the red light-emitting diode (210R) may be larger than the size of the blue light-emitting diode (210B).

[0217] According to the present disclosure, in each of the plurality of light-emitting diode groups (211) forming a single dimming block (200), the magnitude of the voltage applied to the red light-emitting diode (210R), the magnitude of the voltage applied to the green light-emitting diode (210G), and the magnitude of the voltage applied to the blue light-emitting diode (210B) may be provided to be equal to each other. In other words, a common voltage may be applied to the single dimming block (200) regardless of the color of each light-emitting diode.

[0218] FIG. 15 illustrates a light-emitting diode comprising two cells in a display device according to one embodiment.

[0219] FIG. 15 illustrates a first window (253a) of a protective layer (253), at least a portion of a first feed pad (241) and at least a portion of a second feed pad (242) exposed through the first window (253a). Additionally, through the first window (253a), a light-emitting diode (210) mounted on a substrate (112), a first pad (241A) and a second pad (242A) of the light-emitting diode (210), and a first cell (210A-1) and a second cell (210A-2) of the light-emitting diode (210) are illustrated.

[0220] Referring to FIG. 15, the light-emitting diode (210) may include two cells. The first pad (241A) of the light-emitting diode (210) may be electrically connected to the first feed pad (241) exposed through the first window (253a) of the protection layer (253). The second pad (242A) of the light-emitting diode (210) may be electrically connected to the first feed pad (242) exposed through the first window (253a) of the protection layer (253).

[0221] When the light-emitting diode (210) includes two cells, a cell may not be provided between the first pad (241A) and the second pad (242A) of the light-emitting diode (210).

[0222] FIG. 16 illustrates a light-emitting diode comprising three cells in a display device according to one embodiment.

[0223] FIG. 16 illustrates a first window (253a) of a protective layer (253), at least a portion of a first feed pad (241) and at least a portion of a second feed pad (242) exposed through the first window (253a). Additionally, through the first window (253a), a light-emitting diode (210) mounted on a substrate (112), a first pad (241A) and a second pad (242A) of the light-emitting diode (210), and a first cell (210A-1), a second cell (210A-2), and a third cell (210A-3) of the light-emitting diode (210) are illustrated.

[0224] Referring to FIG. 16, the light-emitting diode (210) may include three cells. The first pad (241A) of the light-emitting diode (210) may be electrically connected to the first feed pad (241) exposed through the first window (253a) of the protection layer (253). The second pad (242A) of the light-emitting diode (210) may be electrically connected to the first feed pad (242) exposed through the first window (253a) of the protection layer (253).

[0225] When the light-emitting diode (210) includes three cells, one cell (210A-2) may be provided between the first pad (241A) and the second pad (242A) of the light-emitting diode (210).

[0226] FIG. 17 illustrates a light-emitting diode comprising four cells in a display device according to one embodiment.

[0227] FIG. 17 illustrates a first window (253a) of a protective layer (253), at least a portion of a first feed pad (241) and at least a portion of a second feed pad (242) exposed through the first window (253a). Additionally, through the first window (253a), a light-emitting diode (210) mounted on a substrate (112), a first pad (241A) and a second pad (242A) of the light-emitting diode (210), and a first cell (210A-1), a second cell (210A-2), a third cell (210A-3), and a fourth cell (210A-4) of the light-emitting diode (210) are illustrated.

[0228] Referring to FIG. 17, the light-emitting diode (210) may include four cells. The first pad (241A) of the light-emitting diode (210) may be electrically connected to the first feed pad (241) exposed through the first window (253a) of the protection layer (253). The second pad (242A) of the light-emitting diode (210) may be electrically connected to the first feed pad (242) exposed through the first window (253a) of the protection layer (253).

[0229] When the light-emitting diode (210) includes four cells, two cells (210A-2, 210A-3) may be provided between the first pad (241A) and the second pad (242A) of the light-emitting diode (210).

[0230] FIG. 18 illustrates a light-emitting diode comprising five cells in a display device according to one embodiment.

[0231] FIG. 18 illustrates a first window (253a) of a protective layer (253), at least a portion of a first feed pad (241) and at least a portion of a second feed pad (242) exposed through the first window (253a). Additionally, through the first window (253a), a light-emitting diode (210) mounted on a substrate (112), a first pad (241A) and a second pad (242A) of the light-emitting diode (210), and a first cell (210A-1), a second cell (210A-2), a third cell (210A-3), a fourth cell (210A-4), and a fifth cell (210A-5) of the light-emitting diode (210) are illustrated.

[0232] Referring to FIG. 18, the light-emitting diode (210) may include four cells. The first pad (241A) of the light-emitting diode (210) may be electrically connected to the first feed pad (241) exposed through the first window (253a) of the protection layer (253). The second pad (242A) of the light-emitting diode (210) may be electrically connected to the second feed pad (242) exposed through the first window (253a) of the protection layer (253).

[0233] When the light-emitting diode (210) includes five cells, three cells (210A-2, 210A-3, 210A-4) may be provided between the first pad (241A) and the second pad (242A) of the light-emitting diode (210).

[0234] The size of the light-emitting diode (210) may vary depending on the number of cells included in the light-emitting diode (210). For example, as the number of cells included in the light-emitting diode (210) increases, the size of the light-emitting diode (210) may increase.

[0235] FIG. 19 illustrates a light-emitting diode comprising eight cells in a display device according to one embodiment.

[0236] FIG. 19 illustrates a first window (253a) of a protective layer (253), at least a portion of a first feed pad (241) and at least a portion of a second feed pad (242) exposed through the first window (253a). Additionally, through the first window (253a), a light-emitting diode (210) mounted on a substrate (112), a first pad (241A) and a second pad (242A) of the light-emitting diode (210), and a first cell (210A-1), a second cell (210A-2), a third cell (210A-3), a fourth cell (210A-4), a fifth cell (210A-5), a sixth cell (210A-6), a seventh cell (210A-7) and an eighth cell (210A-8) of the light-emitting diode (210) are illustrated.

[0237] Referring to FIG. 19, the light-emitting diode (210) may include eight cells. The first pad (241A) of the light-emitting diode (210) may be electrically connected to the first feed pad (241) exposed through the first window (253a) of the protection layer (253). The second pad (242A) of the light-emitting diode (210) may be electrically connected to the second feed pad (242) exposed through the first window (253a) of the protection layer (253).

[0238] The first pad (241A) of the light-emitting diode (210) may be positioned adjacent to one end of the first feed pad (241). As shown in FIG. 19, the first pad (241A) of the light-emitting diode (210) may be positioned adjacent to the upper end of the first feed pad (241) in the drawing.

[0239] The second pad (242A) of the light-emitting diode (210) may be positioned adjacent to the other end of the first feed pad (242). As shown in FIG. 19, the second pad (242A) of the light-emitting diode (210) may be positioned adjacent to the lower end of the second feed pad (242) in the drawing.

[0240] According to one embodiment, the first pad (241A) of the light-emitting diode (210) may be positioned adjacent to the other end of the first power supply pad (241), and the second pad (242A) of the light-emitting diode (210) may be positioned adjacent to one end of the second power supply pad (242). For example, the first pad (241A) of the light-emitting diode (210) may be positioned adjacent to the lower end of the first power supply pad (241) in the drawing, and the second pad (242A) of the light-emitting diode (210) may be positioned adjacent to the upper end of the second power supply pad (242) in the drawing.

[0241] As described above, the first pad (241A) of the light-emitting diode (210) is positioned adjacent to one end or the other end of the first feed pad (241), and the second pad (242A) of the light-emitting diode (210) is positioned adjacent to the other end or one end of the second feed pad (242), thereby preventing or reducing the tilting of the light-emitting diode (210). This is because if the first pad (241A) and the second pad (242A) are respectively positioned adjacent to one end of the first power supply pad (241) and one end of the second power supply pad (242), or if the first pad (241A) and the second pad (242A) are respectively positioned adjacent to the other end of the first power supply pad (241) and the other end of the second power supply pad (242), then the light-emitting diode (210) can be mounted so as to be tilted toward the other end of the first power supply pad (241) and the second power supply pad (242), or mounted so as to be tilted toward one end of the first power supply pad (241) and the second power supply pad (242).

[0242] Referring to FIG. 19, a first cell (210A-1) may be provided on the first pad (241A) of the light-emitting diode (210), and an eighth cell (210A-8) may be provided on the second pad (242A) of the light-emitting diode (210). The light-emitting diode (210) may include a second cell (210A-2) provided in an area on the first power supply pad (241) where the first pad (241A) is not provided. The light-emitting diode (210) may include a seventh cell (210A-7) provided on the second power supply pad (242) where the second pad (242A) is not provided.

[0243] According to one embodiment, four cells (210A-3, 210A-4, 210A-5, 210A-6) may be provided between the first power supply pad (241) and the second power supply pad (242). The four cells (210A-3, 210A-4, 210A-5, 210A-6) may be arranged in a 2*2 matrix form. However, this is not limited thereto. Two cells or six or more cells may be provided between the first power supply pad (241) and the second power supply pad (242). If two cells are provided, they may be arranged in a 2*1 matrix form. If six cells are provided, they may be arranged in a 2*3 matrix form.

[0244] The size of the light-emitting diode (210) may vary depending on the number of cells included in the light-emitting diode (210). For example, as the number of cells included in the light-emitting diode (210) increases, the size of the light-emitting diode (210) may increase.

[0245] FIG. 20 illustrates a light-emitting diode comprising eight cells in a display device according to one embodiment.

[0246] FIG. 20 illustrates a first window (253a) of a protective layer (253), at least a portion of a first feed pad (241) and at least a portion of a second feed pad (242) exposed through the first window (253a). Additionally, through the first window (253a), a light-emitting diode (210) mounted on a substrate (112), a first pad (241A) and a second pad (242A) of the light-emitting diode (210), and a first cell (210A-1), a second cell (210A-2), a third cell (210A-3), a fourth cell (210A-4), a fifth cell (210A-5), a sixth cell (210A-6), a seventh cell (210A-7) and an eighth cell (210A-8) of the light-emitting diode (210) are illustrated.

[0247] Referring to FIG. 20, the light-emitting diode (210) may include eight cells. The first pad (241A) of the light-emitting diode (210) may be electrically connected to the first feed pad (241) exposed through the first window (253a) of the protection layer (253). The second pad (242A) of the light-emitting diode (210) may be electrically connected to the second feed pad (242) exposed through the first window (253a) of the protection layer (253).

[0248] The first pad (241A) of the light-emitting diode (210) may extend from one end of the first feed pad (241) to the other end of the first feed pad (241). The first pad (241A) may be made smaller than the first feed pad (241). One end of the first pad (241A) may be adjacent to one end of the first feed pad (241), and the other end of the first pad (241A) may be adjacent to the other end of the first feed pad (241).

[0249] The second pad (242A) of the light-emitting diode (210) may extend from one end of the second feed pad (242) to the other end of the second feed pad (242). The second pad (242A) may be made smaller than the second feed pad (242). One end of the second pad (242A) may be adjacent to one end of the second feed pad (242), and the other end of the second pad (242A) may be adjacent to the other end of the second feed pad (242).

[0250] As described above, the first pad (241A) of the light-emitting diode (210) is extended from a position adjacent to one end of the first feed pad (241) to a position adjacent to the other end, and the second pad (242A) of the light-emitting diode (210) is extended from a position adjacent to one end of the second feed pad (242) to a position adjacent to the other end, thereby preventing or reducing the tilting of the light-emitting diode (210). This is because if the first pad (241A) and the second pad (242A) are respectively positioned adjacent to one end of the first power supply pad (241) and one end of the second power supply pad (242), or if the first pad (241A) and the second pad (242A) are respectively positioned adjacent to the other end of the first power supply pad (241) and the other end of the second power supply pad (242), then the light-emitting diode (210) can be mounted so as to be tilted toward the other end of the first power supply pad (241) and the second power supply pad (242), or mounted so as to be tilted toward one end of the first power supply pad (241) and the second power supply pad (242).

[0251] Referring to FIG. 20, a first cell (210A-1) and a second cell (210A-2) may be provided on the first pad (241A) of the light-emitting diode (210). A seventh cell (210A-7) and an eighth cell (210A-8) may be provided on the second pad (242A) of the light-emitting diode (210).

[0252] According to one embodiment, four cells (210A-3, 210A-4, 210A-5, 210A-6) may be provided between the first power supply pad (241) and the second power supply pad (242) or between the first pad (241) and the second pad (242A). The four cells (210A-3, 210A-4, 210A-5, 210A-6) may be arranged in a 2*2 matrix form. However, they are not limited thereto. Two cells or six or more cells may be provided between the first power supply pad (241) and the second power supply pad (242) or between the first pad (241) and the second pad (242A). If two cells are provided, they may be arranged in a 2*1 matrix form. If six cells are provided, they may be arranged in a 2*3 matrix form.

[0253] The size of the light-emitting diode (210) may vary depending on the number of cells included in the light-emitting diode (210). For example, as the number of cells included in the light-emitting diode (210) increases, the size of the light-emitting diode (210) may increase.

[0254] FIG. 21 illustrates a light-emitting diode comprising six cells in a display device according to one embodiment.

[0255] FIG. 21 illustrates a first window (253a) of a protective layer (253), at least a portion of a first feed pad (241) and at least a portion of a second feed pad (242) exposed through the first window (253a). Additionally, through the first window (253a), a light-emitting diode (210) mounted on a substrate (112), a first pad (241A) and a second pad (242A) of the light-emitting diode (210), and a first cell (210A-1), a second cell (210A-2), a third cell (210A-3), a fourth cell (210A-4), a fifth cell (210A-5) and a sixth cell (210A-6) of the light-emitting diode (210) are illustrated.

[0256] Referring to FIG. 21, the light-emitting diode (210) may include six cells. The first pad (241A) of the light-emitting diode (210) may be electrically connected to the first feed pad (241) exposed through the first window (253a) of the protection layer (253). The second pad (242A) of the light-emitting diode (210) may be electrically connected to the second feed pad (242) exposed through the first window (253a) of the protection layer (253).

[0257] The first pad (241A) of the light-emitting diode (210) may extend from one end of the first feed pad (241) to the other end of the first feed pad (241). The first pad (241A) may be made smaller than the first feed pad (241). One end of the first pad (241A) may be adjacent to one end of the first feed pad (241), and the other end of the first pad (241A) may be adjacent to the other end of the first feed pad (241).

[0258] The second pad (242A) of the light-emitting diode (210) may extend from one end of the second feed pad (242) to the other end of the second feed pad (242). The second pad (242A) may be made smaller than the second feed pad (242). One end of the second pad (242A) may be adjacent to one end of the second feed pad (242), and the other end of the second pad (242A) may be adjacent to the other end of the second feed pad (242).

[0259] As described above, the first pad (241A) of the light-emitting diode (210) is extended from a position adjacent to one end of the first feed pad (241) to a position adjacent to the other end, and the second pad (242A) of the light-emitting diode (210) is extended from a position adjacent to one end of the second feed pad (242) to a position adjacent to the other end, thereby preventing or reducing the tilting of the light-emitting diode (210). This is because if the first pad (241A) and the second pad (242A) are respectively positioned adjacent to one end of the first power supply pad (241) and one end of the second power supply pad (242), or if the first pad (241A) and the second pad (242A) are respectively positioned adjacent to the other end of the first power supply pad (241) and the other end of the second power supply pad (242), then the light-emitting diode (210) can be mounted so as to be tilted toward the other end of the first power supply pad (241) and the second power supply pad (242), or mounted so as to be tilted toward one end of the first power supply pad (241) and the second power supply pad (242).

[0260] Referring to FIG. 21, a first cell (210A-1) may be provided on the first pad (241A) of the light-emitting diode (210). A sixth cell (210A-6) may be provided on the second pad (242A) of the light-emitting diode (210). The first cell (210A-1) may be provided to correspond to the first pad (241A). The sixth cell (210A-6) may be provided to correspond to the second pad (242A). That the first cell (210A-1) corresponds to the first pad (241A) may mean that the first cell (210A-1) and the first pad (241A) are provided with similar size and shape. The fact that the sixth cell (210A-6) and the second pad (242A) correspond to each other may mean that the sixth cell (210A-6) and the second pad (242A) are provided with similar size and shape.

[0261] According to one embodiment, four cells (210A-2, 210A-3, 210A-4, 210A-5) may be provided between the first power supply pad (241) and the second power supply pad (242), between the first pad (241) and the second pad (242A), or between the first cell (210A-1) and the sixth cell (210A-6). The four cells (210A-2, 210A-3, 210A-4, 210A-5) may be arranged in a 2*2 matrix form. However, they are not limited thereto. Between the first power supply pad (241) and the second power supply pad (242), or between the first pad (241) and the second pad (242A), or between the first cell (210A-1) and the sixth cell (210A-6), two cells or six or more cells may be provided. If two cells are provided, they may be arranged in a 2*1 matrix form. If six cells are provided, they may be arranged in a 2*3 matrix form.

[0262] The size of the light-emitting diode (210) may vary depending on the number of cells included in the light-emitting diode (210). For example, as the number of cells included in the light-emitting diode (210) increases, the size of the light-emitting diode (210) may increase.

[0263] In FIGS. 15 to 21, the size of the light-emitting diode (210) is shown as being smaller than the size of the first window (253a) of the protective layer (253), but is not limited thereto. The size of the light-emitting diode (210) may be larger than the size of the first window (253a). However, even if the size of the light-emitting diode (210) is larger than the size of the first window (253a), the first pad (241A) and the second pad (242A) of the light-emitting diode (210) may be located inside the first window (253a).

[0264] A display device according to one embodiment includes a liquid crystal panel and a backlight unit provided to provide light to the liquid crystal panel. The backlight unit includes a substrate, a red light-emitting diode mounted on a first surface of the substrate, a green light-emitting diode mounted on the first surface of the substrate, and a blue light-emitting diode mounted on the first surface of the substrate. The red light-emitting diode includes a first plurality of cells, the green light-emitting diode includes a second plurality of cells, and the blue light-emitting diode includes a third plurality of cells.

[0265] The first plurality of cells of the above red light-emitting diode may include four cells.

[0266] The second plurality of cells of the above green light-emitting diode may include three cells.

[0267] The third plurality of cells of the above blue light-emitting diode may include three cells.

[0268] The first plurality of cells of the above red light-emitting diode may include five cells.

[0269] The second plurality of cells of the above green light-emitting diode may include four cells.

[0270] The third plurality of cells of the above blue light-emitting diode may include four cells.

[0271] The above display device may further include a plurality of red light-emitting diodes including the red light-emitting diode.

[0272] The above display device may further include a plurality of green light-emitting diodes including the green light-emitting diode.

[0273] The above display device may further include a plurality of blue light-emitting diodes including the blue light-emitting diode.

[0274] The display device may further include a plurality of light-emitting diode groups arranged in a plurality of rows and a plurality of columns on the substrate, wherein a first light-emitting diode group among the plurality of light-emitting diode groups comprises a first red light-emitting diode among the plurality of red light-emitting diodes, a first green light-emitting diode among the plurality of green light-emitting diodes, and a first blue light-emitting diode among the plurality of blue light-emitting diodes, and a second light-emitting diode group among the plurality of light-emitting diode groups may further include a plurality of light-emitting diode groups comprising a second red light-emitting diode among the plurality of red light-emitting diodes, a second green light-emitting diode among the plurality of green light-emitting diodes, and a second blue light-emitting diode among the plurality of blue light-emitting diodes.

[0275] The display device may further include a dimming block comprising a portion of the plurality of light-emitting diode groups arranged to be simultaneously turned ON or OFF.

[0276] Some of the plurality of light-emitting diode groups of the above dimming block may include the first light-emitting diode group and the second light-emitting diode group.

[0277] The magnitude of the voltage applied to the first red light-emitting diode, the magnitude of the voltage applied to the first green light-emitting diode, and the magnitude of the voltage applied to the first blue light-emitting diode can be provided to be equal to each other.

[0278] The magnitude of the voltage applied to the second red light-emitting diode, the magnitude of the voltage applied to the second green light-emitting diode, and the magnitude of the voltage applied to the second blue light-emitting diode can be provided to be equal to each other.

[0279] The display device may further include a reflective sheet provided to cover the first surface of the substrate, having a plurality of holes formed therein in which each of the plurality of light-emitting diode groups is disposed.

[0280] The display device may further include a plurality of optical domes provided on the inner side of each of the plurality of holes and provided to cover each of the plurality of light-emitting diode groups.

[0281] The display device may further include a first feed pad configured to apply a positive voltage to the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode, as a part of a conductive layer which is at least a part of the first surface of the substrate.

[0282] The display device may further include a second feed pad provided to apply a negative voltage to the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode as a part of the conductive layer.

[0283] The above red light-emitting diode may include a first pad arranged to be electrically connected to the first power supply pad and a second pad arranged to be electrically connected to the second power supply pad.

[0284] The green light-emitting diode may include a third pad arranged to be electrically connected to the first feed pad and a fourth pad arranged to be electrically connected to the second feed pad.

[0285] The above blue light-emitting diode may include a fifth pad arranged to be electrically connected to the first power supply pad and a sixth pad arranged to be electrically connected to the second power supply pad.

[0286] The first plurality of cells of the above red light-emitting diode may include two cells disposed between the first pad and the second pad.

[0287] The second plurality of cells of the green light-emitting diode may include one cell disposed between the third pad and the fourth pad.

[0288] The third plurality of cells of the above blue light-emitting diode may include one cell disposed between the fifth pad and the sixth pad.

[0289] The first plurality of cells of the above red light-emitting diode may include three cells disposed between the first pad and the second pad.

[0290] The second plurality of cells of the green light-emitting diode may include two cells disposed between the third pad and the fourth pad.

[0291] The third plurality of cells of the above blue light-emitting diode may include two cells disposed between the fifth pad and the sixth pad.

[0292] The length of the short side of each of the two cells disposed between the first pad and the second pad in the above red light-emitting diode may be 100 μm or less.

[0293] The length of the short side of one cell disposed between the third pad and the fourth pad in the green light-emitting diode may be 100 μm or less.

[0294] The length of the short side of one cell disposed between the fifth pad and the sixth pad in the above blue light-emitting diode may be 100 μm or less.

[0295] A display device according to one embodiment includes a liquid crystal panel and a backlight unit provided to provide light to the liquid crystal panel. The backlight unit includes a substrate including an insulating layer and a conductive layer, a light-emitting diode provided to be mounted on the substrate and including a first pad which is an anode and a second pad which is a cathode, a first power supply pad provided to connect an anode to the first pad as a part of the conductive layer, and a second power supply pad provided to connect a cathode to the second pad as a part of the conductive layer. The light-emitting diode includes at least one cell disposed between the first pad and the second pad.

[0296] The light-emitting diode mentioned above may be one of a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode.

[0297] The above red light-emitting diode may include two cells disposed between the first pad and the second pad.

[0298] The above green light-emitting diode may include one cell disposed between the first pad and the second pad.

[0299] The above blue light-emitting diode may include one cell disposed between the first pad and the second pad.

[0300] The length of the short side of each of the two cells disposed between the first pad and the second pad in the above red light-emitting diode may be 100 μm or less.

[0301] The length of the short side of one cell disposed between the first pad and the second pad in the green light-emitting diode may be 100 μm or less.

[0302] The length of the short side of one cell disposed between the first pad and the second pad in the above blue light-emitting diode may be 100 μm or less.

[0303] The above red light-emitting diode may include four cells.

[0304] The above green light-emitting diode may include three cells.

[0305] The above blue light-emitting diode may include three cells.

[0306] The light-emitting diode mentioned above may be one of a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode.

[0307] The above red light-emitting diode may include three cells disposed between the first pad and the second pad.

[0308] The above green light-emitting diode may include two cells disposed between the first pad and the second pad.

[0309] The above blue light-emitting diode may include two cells disposed between the first pad and the second pad.

[0310] The above red light-emitting diode may include five cells.

[0311] The above green light-emitting diode may include four cells.

[0312] The above blue light-emitting diode may include four cells.

[0313] The display device may further include a plurality of light-emitting diode groups arranged in a plurality of rows and a plurality of columns on the substrate, each including the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode.

[0314] The display device may further include a dimming block comprising groups of light-emitting diodes connected to each other so as to be simultaneously turned ON or OFF among the plurality of light-emitting diode groups.

[0315] In each of the groups of light-emitting diodes of the dimming block, the magnitude of the voltage applied to the red light-emitting diode, the magnitude of the voltage applied to the green light-emitting diode, and the magnitude of the voltage applied to the blue light-emitting diode may be provided to be equal to each other.

[0316] The display device may further include a reflective sheet provided to cover one side of the substrate, having a plurality of holes formed therein in which each of the plurality of light-emitting diode groups is disposed.

[0317] The display device may further include a plurality of optical domes provided on the inner side of each of the plurality of holes and provided to cover each of the plurality of light-emitting diode groups.

[0318] According to the concept of the present disclosure, a display device can be provided that improves the lifespan and color stability of a light-emitting diode through high voltage and low current driving of the light-emitting diode.

[0319] According to the concept of the present disclosure, a display device can be provided that can reduce voltage loss while supplying a common voltage to a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode.

[0320] According to the concept of the present disclosure, a display device can be provided in which, among a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode forming a group of light-emitting diodes, the number of cells of the red light-emitting diode is greater than the number of cells of the green light-emitting diode and the number of cells of the blue light-emitting diode.

[0321] According to the concept of the present disclosure, a display device comprising a light-emitting diode having at least one cell disposed between an anode pad and a cathode pad can be provided.

[0322] Specific embodiments have been illustrated and described above. However, the invention is not limited to the embodiments described above, and those skilled in the art may make various modifications without departing from the essence of the technical concept of the invention as described in the following claims.

Claims

1. Liquid crystal panel; and A backlight unit provided to provide light to the liquid crystal panel; comprising The above backlight unit is, Substrate; A red light-emitting diode mounted on the first surface of the above substrate; A green light-emitting diode mounted on the first surface of the substrate; and A blue light-emitting diode mounted on the first surface of the substrate; comprising The above red light-emitting diode includes a first plurality of cells, and The above green light-emitting diode includes a second plurality of cells, and The above blue light-emitting diode is a display device comprising a third plurality of cells.

2. In Paragraph 1, The first plurality of cells of the above red light-emitting diode include four cells, and The second plurality of cells of the above green light-emitting diode includes three cells, and The third plurality of cells of the above blue light-emitting diode is a display device comprising three cells.

3. In Paragraph 1, The first plurality of cells of the above red light-emitting diode include five cells, and The second plurality of cells of the above green light-emitting diode includes four cells, and The third plurality of cells of the above blue light-emitting diode is a display device comprising four cells.

4. In Paragraph 1, A plurality of red light-emitting diodes including the above red light-emitting diode; A plurality of green light-emitting diodes including the above green light-emitting diode; A plurality of blue light-emitting diodes including the above blue light-emitting diode; A plurality of light-emitting diode groups arranged in a plurality of rows and a plurality of columns on the substrate, wherein a first light-emitting diode group among the plurality of light-emitting diode groups comprises a first red light-emitting diode among the plurality of red light-emitting diodes, a first green light-emitting diode among the plurality of green light-emitting diodes, and a first blue light-emitting diode among the plurality of blue light-emitting diodes, and a second light-emitting diode group among the plurality of light-emitting diode groups comprises a second red light-emitting diode among the plurality of red light-emitting diodes, a second green light-emitting diode among the plurality of green light-emitting diodes, and a second blue light-emitting diode among the plurality of blue light-emitting diodes; A display device further comprising a dimming block including some of the plurality of light-emitting diode groups arranged to be simultaneously turned ON or OFF.

5. In Paragraph 4, Some of the plurality of light-emitting diode groups of the above dimming block include the first light-emitting diode group and the second light-emitting diode group, The magnitude of the voltage applied to the first red light-emitting diode, the magnitude of the voltage applied to the first green light-emitting diode, and the magnitude of the voltage applied to the first blue light-emitting diode are provided to be equal to each other, A display device in which the magnitude of the voltage applied to the second red light-emitting diode, the magnitude of the voltage applied to the second green light-emitting diode, and the magnitude of the voltage applied to the second blue light-emitting diode are provided to be equal to each other.

6. In Paragraph 4, A reflective sheet provided to cover the first surface of the substrate, having a plurality of holes formed therein in which each of the plurality of light-emitting diode groups is disposed; and A display device further comprising: a plurality of optical domes provided on the inner side of each of the plurality of holes and provided to cover each of the plurality of light-emitting diode groups.

7. In Paragraph 1, A first feed pad provided to apply a positive voltage to the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode, as a part of a conductive layer which is at least a part of the first surface of the substrate; and A display device further comprising: a second feed pad provided to apply a negative voltage to the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode as a part of the conductive layer.

8. In Paragraph 7, The above red light-emitting diode includes a first pad arranged to be electrically connected to the first power supply pad and a second pad arranged to be electrically connected to the second power supply pad. The above green light-emitting diode includes a third pad arranged to be electrically connected to the first power supply pad and a fourth pad arranged to be electrically connected to the second power supply pad, and The above blue light-emitting diode is a display device comprising a fifth pad arranged to be electrically connected to the first power supply pad and a sixth pad arranged to be electrically connected to the second power supply pad.

9. In Paragraph 8, The first plurality of cells of the above red light-emitting diode include two cells disposed between the first pad and the second pad, and The second plurality of cells of the green light-emitting diode comprises one cell disposed between the third pad and the fourth pad, and The third plurality of cells of the above blue light-emitting diode comprises a single cell disposed between the fifth pad and the sixth pad.

10. In Paragraph 8, The first plurality of cells of the above red light-emitting diode include three cells disposed between the first pad and the second pad, and The second plurality of cells of the green light-emitting diode comprises two cells disposed between the third pad and the fourth pad, and The third plurality of cells of the above blue light-emitting diode comprises two cells disposed between the fifth pad and the sixth pad.

11. In Paragraph 9, In the above red light-emitting diode, the length of the short side of the two cells disposed between the first pad and the second pad is each 100 μm or less, and The short side length of one cell disposed between the third pad and the fourth pad in the above green light-emitting diode is 100 μm or less, and A display device in which the short side length of one cell disposed between the fifth pad and the sixth pad in the above blue light-emitting diode is 100 μm or less.

12. Liquid crystal panel; and A backlight unit provided to provide light to the liquid crystal panel; comprising The above backlight unit is, A substrate comprising an insulating layer and a conductive layer; A light-emitting diode configured to be mounted on the above substrate, comprising a first pad which is an anode and a second pad which is a cathode; A first power supply pad provided to connect a positive electrode to the first pad as a part of the conductive layer; and A second power supply pad provided to connect a negative electrode to the second pad as a part of the conductive layer; comprising The light-emitting diode is a display device comprising at least one cell disposed between the first pad and the second pad.

13. In Paragraph 12, The above light-emitting diode is one of a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode, and The above red light-emitting diode includes two cells disposed between the first pad and the second pad, and The above green light-emitting diode includes one cell disposed between the first pad and the second pad, and The above blue light-emitting diode is a display device comprising one cell disposed between the first pad and the second pad.

14. In Paragraph 13, The above red light-emitting diode includes four cells, and The above green light-emitting diode includes three cells, and The above blue light-emitting diode is a display device comprising three cells.

15. In Paragraph 12, The above light-emitting diode is one of a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode, and The above red light-emitting diode includes three cells disposed between the first pad and the second pad, and The above green light-emitting diode includes two cells disposed between the first pad and the second pad, and The above blue light-emitting diode is a display device comprising two cells disposed between the first pad and the second pad.

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