Display apparatus and light apparatus thereof

Abstract

The disclosed light source device includes a diffuser plate and a light source module disposed behind the diffuser plate, wherein the light source module includes a substrate, a plurality of light-emitting diodes mounted on the substrate, and a plurality of reflective layers each provided on the front surface of the plurality of light-emitting diodes, wherein the distance between the centers of each of the plurality of light-emitting diodes is called the pitch and the distance between the diffuser plate and the substrate is called the optical distance, and the pitch and the optical distance satisfy the following relationship. 2.5 ≤ Pitch / Optical Distance ≤ 4.5

Description

Technology Field

[0001] The present invention relates to a display device and a light source device thereof, and more specifically, to a display device and a light source device thereof having an improved optical structure. Background Technology

[0002] Generally, 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, and is used in various fields such as homes and workplaces.

[0003] Display devices include monitor devices connected to personal computers or server computers, portable computer devices, navigation terminal devices, general television devices, Internet Protocol Television (IPTV) devices, portable terminal devices such as smartphones, tablet PCs, Personal Digital Assistants (PDAs), or cellular phones, various display devices used to play images such as advertisements or movies in industrial settings, or various other types of audio / video systems.

[0004] A display device includes a light source module for converting electrical information into visual information, and the light source module includes a plurality of light sources for independently emitting light.

[0005] Each of the plurality of light sources includes, for example, a light-emitting diode (LED) or an organic light-emitting diode (OLED). For example, the light-emitting diode or organic light-emitting diode may be mounted on a substrate (circuit board or substrate). The problem to be solved

[0006] One aspect of the present invention provides a display device capable of reducing costs.

[0007] Another aspect of the present invention provides a display device capable of reducing thickness. means of solving the problem

[0008] A light source device according to the concept of the present invention comprises a diffuser plate and a light source module disposed behind the diffuser plate, wherein the light source module comprises a substrate, a plurality of light-emitting diodes mounted on the substrate, and a plurality of reflective layers each provided on the front surface of the plurality of light-emitting diodes, wherein the distance between the centers of each of the plurality of light-emitting diodes is called the pitch and the distance between the diffuser plate and the substrate is called the optical distance, and the pitch and the optical distance satisfy the following relationship.

[0009] 2.5 ≤ Pitch / Optical Distance ≤ 4.5

[0010] The light source module may include a plurality of optical domes that each cover the plurality of light-emitting diodes.

[0011] The plurality of reflective layers may be configured so that the main optical emitted from each of the plurality of light-emitting diodes has an angle of 50° or more and 65° or less with respect to the front-rear direction.

[0012] The above reflective layer can be provided as a Distributed Bragg Reflector (DBR).

[0013] The above pitch can be provided as 4mm or more and 14mm or less.

[0014] The above optical distance can be set to be 1.5 mm or more and 4.5 mm or less.

[0015] The plurality of light-emitting diodes are arranged along a first direction and a second direction perpendicular to the first direction, and the pitch can be set to a first interval along the first direction that is larger than a second interval along the second direction.

[0016] The first interval according to the first direction and the second interval according to the second direction can satisfy the following relationship.

[0017] 1st interval ≤ 1.1*(2nd interval)

[0018] When the above pitch is a maximum value and the above optical distance is 1.5 mm or more and 2.5 mm or less, the above pitch and the above optical distance can satisfy the following relationship.

[0019] 3.5 ≤ Pitch / Optical Distance ≤ 4.5

[0020] When the above pitch is a maximum value and the above optical distance is 2.5 mm or more and 3.5 mm or less, the above pitch and the above optical distance can satisfy the following relationship.

[0021] 3.2 ≤ Pitch / Optical Distance ≤ 4.2

[0022] When the above pitch is a maximum value and the above optical distance is 3.5 mm or more and 4.5 mm or less, the above pitch and the above optical distance can satisfy the following relationship.

[0023] 2.5 ≤ Pitch / Optical Distance ≤ 3.5

[0024] The above plurality of optical domes may be composed of silicone or epoxy resin.

[0025] The light-emitting diode above can be configured to emit blue light.

[0026] In another aspect, a display device according to the concept of the present invention comprises a light source device that outputs light and a liquid crystal panel that blocks or passes the light, wherein the light source device comprises a diffuser plate and a light source module disposed behind the diffuser plate, wherein the light source module comprises a substrate, a plurality of light-emitting diodes mounted on the substrate and arranged along a first direction and a second direction different from the first direction, and a plurality of optical domes each covering the plurality of light-emitting diodes, wherein the distance between the centers of each of the plurality of light-emitting diodes is called the pitch and the distance between the diffuser plate and the substrate is called the optical distance, and the pitch and the optical distance satisfy the following relationship.

[0027] 2.2 ≤ Pitch / Optical Distance ≤ 4.5

[0028] The light source module may include a plurality of reflective layers each provided on the front surface of the plurality of light-emitting diodes.

[0029] The plurality of reflective layers may be configured so that the main optical emitted from each of the plurality of light-emitting diodes has an angle of 50° or more and 65° or less with respect to the front-rear direction.

[0030] The above pitch is set to a first interval according to the first direction that is larger than the second interval according to the second direction, and the first interval according to the first direction and the second interval according to the second direction can satisfy the following relationship.

[0031] 1st interval ≤ 1.1*(2nd interval)

[0032] When the above pitch is a maximum value and the above optical distance is 1.5 mm or more and 2.5 mm or less, the above pitch and the above optical distance can satisfy the following relationship.

[0033] 3.5 ≤ Pitch / Optical Distance ≤ 4.5

[0034] When the above pitch is a maximum value and the above optical distance is 2.5 mm or more and 3.5 mm or less, the above pitch and the above optical distance can satisfy the following relationship.

[0035] 3.2 ≤ Pitch / Optical Distance ≤ 4.2

[0036] When the above pitch is a maximum value and the above optical distance is 3.5 mm or more and 4.5 mm or less, the above pitch and the above optical distance can satisfy the following relationship.

[0037] 2.2 ≤ Pitch / Optical Distance ≤ 3.5 Effects of the invention

[0038] According to the concept of the present invention, the display device can reduce the number of light sources, thereby reducing costs.

[0039] According to the concept of the present invention, the display device can reduce the optical distance, and thus reduce the thickness. Brief explanation of the drawing

[0040] FIG. 1 illustrates the appearance of a display device according to one embodiment of the present invention. Figure 2 shows the display device illustrated in Figure 1 in disassembly. Figure 3 shows a side cross-section of a liquid crystal panel of a display device shown in Figure 2. Figure 4 shows the light source device illustrated in Figure 2 in disassembly. Figure 5 illustrates the combination of a light source module and a reflective sheet included in the light source device shown in Figure 4. FIG. 6 shows a perspective view of a light source included in the light source device shown in FIG. 4. Figure 7 illustrates the light source shown in Figure 6 in disassembled form. Figure 8 shows a cross-section along the line AA' indicated in Figure 6. Figure 9 is a diagram illustrating the path of light emitted from the light-emitting diode shown in Figure 8. FIG. 10 is a drawing showing the front view of the light source module illustrated in FIG. 4. Figure 11 is a diagram illustrating the relationship between the light source module and the diffuser plate shown in Figure 4. FIG. 12 is a diagram illustrating experimental results when the numerical range of the pitch / optical distance of a display device deviates from the numerical range according to one embodiment of the present invention. FIG. 13 is a diagram illustrating experimental results when the numerical range of the pitch / optical distance of the display device is within the numerical range according to one embodiment of the present invention. Specific details for implementing the invention

[0041] Throughout the specification, the same reference numerals refer to the same components. This specification does not describe all elements of the embodiments, and general content in the art to which the invention pertains or content that overlaps between embodiments is omitted. The terms 'part, module, component, block' used in the specification may be implemented in software or hardware, and depending on the embodiments, a plurality of 'parts, modules, components, blocks' may be implemented as a single component, or a single 'part, module, component, block' may include a plurality of components.

[0042] Throughout the specification, when a part is described as being "connected" to another part, this includes not only cases where they are directly connected but also cases where they are indirectly connected, and indirect connections include connections made via a wireless communication network.

[0043] Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0044] Throughout the specification, when it is stated that a component is located "on" another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components.

[0045] Terms such as "first," "second," etc., are used to distinguish one component from another, and the components are not limited by the aforementioned terms.

[0046] Singular expressions include plural expressions unless there is an obvious exception in the context.

[0047] In each step, identification codes are used for convenience of explanation and do not describe the order of the steps; the steps may be performed differently from the specified order unless a specific order is clearly indicated in the context.

[0048] The operating principle and embodiments of the present invention will be described below with reference to the attached drawings.

[0049] FIG. 1 illustrates the appearance of a display device according to one embodiment of the present invention.

[0050] A display device (10) is a device capable of processing video signals 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.

[0051] 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.

[0052] 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.

[0053] 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 (19) provided at the bottom of the main body (11) to support the main body (11).

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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 light source device, etc.

[0058] In order to emit light of various colors, each of the multiple pixels (P) consists of subpixels (P R , P G , P B It may include ).

[0059] Subpixels (P R , P G , P B ) is a red subpixel (P) capable of emitting red light. R ) and a green subpixel (P) capable of emitting green light G ) and a blue subpixel (P) capable of emitting blue light BIt may include ). For example, red light may represent light with wavelengths from approximately 620 nm (nanometer, one billionth of a meter) to 750 nm, green light may represent light with wavelengths from approximately 495 nm to 570 nm, and blue light may represent light with wavelengths from approximately 450 nm to 495 nm.

[0060] 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).

[0061] Figure 2 shows the display device illustrated in Figure 1 in disassembly.

[0062] As shown in FIG. 2, various components for generating an image (I) on a screen (S) may be provided inside the main body (11).

[0063] For example, the main body (11) is provided with a light source device (100) which is a surface light source, a liquid crystal panel (20) that blocks or passes light emitted from the light source device (100), a control assembly (50) that controls the operation of the light source device (100) and the liquid crystal panel (20), and a power assembly (60) that supplies power to the light source device (100) and the liquid crystal panel (20). Additionally, the main body (11) includes a bezel (13), a frame middle mold (14), a bottom chassis (15), and a rear cover (16) for supporting and fixing the liquid crystal panel (20), the light source device (100), the control assembly (50), and the power assembly (60).

[0064] The light source device (100) may include a point light source that emits monochromatic light or white light, and may refract, reflect, and scatter light to convert the light emitted from the point light source into uniform surface light. For example, the light source device (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.

[0065] In this way, the light source device (100) can emit uniform surface light toward the front by refracting, reflecting, and scattering light emitted from the light source.

[0066] The configuration of the light source device (100) is described in more detail below.

[0067] Figure 3 shows a side cross-section of a liquid crystal panel of a display device shown in Figure 2.

[0068] A liquid crystal panel (20) is provided in front of a light source device (100) and blocks or passes light emitted from the light source device (100) to form an image (I).

[0069] 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) can form a plurality of pixels (P). The plurality of pixels (P) of the liquid crystal panel (20) can each independently block or pass light from the light source device (100), and the light passed by the plurality of pixels (P) can form an image (I) displayed on the screen (12).

[0070] 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).

[0071] 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.

[0072] 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).

[0073] 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) allows light having a magnetic field vibrating in a first direction to pass through and blocks other light. Additionally, the second polarizing film (29) allows light having a magnetic field vibrating in a second direction to pass through and blocks other light. At this time, the first direction and the second direction may be orthogonal to each other. Accordingly, the polarization direction of the light passed by the first polarizing film (21) and the vibration direction of the light passed by 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.

[0074] A color filter (27) may be provided on the inner side of the second transparent substrate (28).

[0075] 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 (P R Corresponding to ), the area where the green filter (27G) is formed is the green subpixel (P G Corresponding to ), the area where the blue filter (27B) is formed is a blue subpixel (P B It corresponds to ).

[0076] 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).

[0077] 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 (25a) constituting the liquid crystal layer (25) described below.

[0078] 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).

[0079] A thin film transistor (TFT) (24) is provided on the inner side of the second transparent substrate (22).

[0080] 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).

[0081] The thin film transistor (24) can be made of polysilicon and can be formed by semiconductor processes such as lithography, deposition, and ion implantation.

[0082] A liquid crystal layer (25) is formed between the pixel electrode (23) and the common electrode (26), and the liquid crystal layer (25) is filled with liquid crystal molecules (25a).

[0083] 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 possess both the fluidity of liquids and the optical anisotropy of crystals (solids).

[0084] 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 (25a) 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 (25a) 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).

[0085] 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 are provided.

[0086] 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.

[0087] 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).

[0088] Additionally, the cable (20a) and the driver IC (30) can be implemented as a single unit using a film cable, a chip on film (COF), a tape carrier packet (TCP), etc. In other words, the driver IC (30) can be placed on the cable (20b). However, it is not limited thereto, and the driver IC (30) can be placed on the liquid crystal panel (20).

[0089] The control assembly (50) may include a control circuit that controls the operation of the liquid crystal panel (20) and the light source device (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 light source device (100).

[0090] The power assembly (60) can supply power to the liquid crystal panel (20) and the light source device (100) so that the light source device (100) outputs surface light and the liquid crystal panel (20) blocks or passes the light of the light source device (100).

[0091] 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.

[0092] A light source device (100) is described below.

[0093] FIG. 4 illustrates the light source device shown in FIG. 2 in disassembly. FIG. 5 illustrates the combination of a light source module and a reflective sheet included in the light source device shown in FIG. 4.

[0094] A light source device (100) includes 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.

[0095] The light source module (110) may include a plurality of light sources (111) that emit light and a substrate (112) that supports / fixes the plurality of light sources (111).

[0096] 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.

[0097] For example, as shown in FIG. 4, a plurality of light sources (111) can be arranged in rows and columns. Accordingly, a plurality of 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 equal.

[0098] 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.

[0099] 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.

[0100] 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).

[0101] 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.

[0102] 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).

[0103] The reflective sheet (120) can reflect light emitted from a plurality of light sources (111) forward or in a direction close to the forward.

[0104] A plurality of through holes (120a) are 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 sources (111) of the light source module (110) can pass through the through holes (120a) and protrude forward from the reflective sheet (120).

[0105] For example, as shown in the upper part of FIG. 5, 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) are inserted into a plurality of through holes (120a) formed in the reflective sheet (120). As a result, as shown in the lower part of FIG. 5, 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).

[0106] Accordingly, a plurality of light sources (111) can emit light in front of the reflective sheet (120).

[0107] 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).

[0108] Light emitted from a light source (111) passes through various objects such as a diffuser plate (130) and an optical sheet (140). When the light passes through the diffuser plate (130) and the optical sheet (140), some of the incident light is reflected from the surfaces 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).

[0109] 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).

[0110] As previously explained, a plurality of light sources (111) are located at various points on the rear of the light source device (100). Although the plurality of light sources (111) are arranged at equal intervals on the rear of the light source device (100), non-uniformity in brightness may occur depending on the position of the plurality of light sources (111).

[0111] 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). In other words, the diffuser plate (130) can uniformly emit non-uniform light from a plurality of light sources (111) to the front.

[0112] 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.

[0113] The diffusion sheet (141) diffuses 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).

[0114] 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 are arranged adjacently to form a plurality of band shapes.

[0115] 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 light source device (100), and the brightness of the display device (10) can be improved through this light recycling.

[0116] 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.

[0117] FIG. 6 shows a perspective view of a light source included in the light source device shown in FIG. 4. FIG. 7 shows an exploded view of the light source shown in FIG. 6. FIG. 8 shows a cross-section along the line AA' indicated in FIG. 6.

[0118] Referring to FIGS. 6 to 8, the light source (111) of the light source device (100) will be described.

[0119] As previously described, the light source module (110) includes a plurality of light sources (111). The plurality of light sources (111) can 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 FIGS. 6 and 7, a portion of the light source (111) and the substrate (112) can 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 a light-emitting diode (210), an optical dome (220), and a reflective layer (260).

[0122] 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) is provided with a pair of electrodes (210a) for supplying holes and electrons to the P-type semiconductor and the N-type semiconductor, respectively.

[0123] The 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, the light-emitting diode (210) can emit blue light having a peak value at a wavelength that represents blue (e.g., a wavelength between 430 nm and 495 nm).

[0124] 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.

[0125] 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.

[0126] On the substrate (112), a power supply line (230) and a power supply pad (240) are provided to supply power to a flip-chip type light-emitting diode (210).

[0127] The substrate (112) is provided with a feed line (230) for supplying electrical signals and / or power from a control assembly (50) and / or a power assembly (60) to a light-emitting diode (210).

[0128] As shown in FIG. 8, the substrate (112) can be formed by alternately stacking a non-conductive insulation layer (251) and a conductive conduction layer (252).

[0129] 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.

[0130] 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.

[0131] The power supply line (230) can be implemented by a line or pattern formed in the conductive layer (252).

[0132] The power supply line (230) can be electrically connected to the light-emitting diode (210) through the power supply pad (240).

[0133] The power supply pad (240) can be formed by exposing the power supply line (230) to the outside.

[0134] A protection layer (253) may be formed on the outermost surface of the substrate (112) to prevent or suppress damage to the substrate (112) caused by external impact and / or by chemical action (e.g., corrosion, etc.) and / or by optical action. The protection layer (253) may include a photo solder resist (PSR).

[0135] As shown in FIG. 8, the protective layer (253) can cover the power supply line (230) to prevent the power supply line (230) from being exposed to the outside.

[0136] For electrical contact between the power supply line (230) and the light-emitting diode (210), a window may be formed in the protective layer (253) that exposes a portion of the power supply line (230) to the outside. The portion of the power supply line (230) exposed to the outside by the window of the protective layer (253) may form a power supply pad (240).

[0137] A conductive adhesive material (240a) is applied to the power supply pad (240) for electrical contact between the externally exposed power supply line (230) and the electrode (210a) of the light-emitting diode (210). The conductive adhesive material (240a) can be applied within the window of the protective layer (253).

[0138] The electrode (210a) of the light-emitting diode (210) is in contact with a conductive adhesive material (240a), and the light-emitting diode (210) can be electrically connected to a power supply line (230) through the conductive adhesive material (240a).

[0139] The conductive adhesive material (240a) may include, for example, an electrically conductive solder. However, it is not limited thereto, and the conductive adhesive material (240a) may include electrically conductive epoxy adhesives.

[0140] 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 the pair of electrodes (210a) provided in the flip-chip type light-emitting diode (210) may be provided.

[0141] The optical dome (220) can cover the light-emitting diode (210). 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.

[0142] The optical dome (220) may have a dome shape, for example, by cutting a sphere with a surface that does not include its center, or a hemispherical shape, 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.

[0143] 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).

[0144] 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 having 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 0.25 to 0.31 (preferably 0.28), 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 having 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.

[0145] 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.

[0146] 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).

[0147] 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).

[0148] The reflective layer (260) may be located in front of the light-emitting diode (210). The reflective layer (260) may be placed on the front surface of the light-emitting diode (210). The reflective layer (260) may be a multilayer reflective structure in which a plurality of insulating films having different refractive indices are alternately stacked. For example, such a multilayer reflective structure may be a Distributed Bragg Reflector (DBR) in which a first insulating film having a first refractive index and a second insulating film having a second refractive index are alternately stacked.

[0149] Figure 9 is a diagram showing the profile of light emitted from the light-emitting diode shown in Figure 8.

[0150] Specifically, the light profile, which is the light emission information of the light emitted from the center of the light-emitting diode (210) shown in FIG. 8, is as shown in FIG. 9. Referring to FIG. 9, the light emitted from the light-emitting diode (210) can be diffused and emitted by the reflection characteristics of the reflection layer (260). In FIG. 9, the arrows represent the brightness of the light, and the longer the arrow, the brighter the light. In the light profile shown in FIG. 9, the longer the arrow, the more light is emitted, and the brighter the direction in which more light is emitted, the brighter the brightness. In FIG. 9, the direction in which the arrow is longest, that is, the direction in which the most light is emitted, that is, the brightest direction, can be defined as the main optical path (M).

[0151] Specifically, the main light path (M) of the light-emitting diode (210) can be configured to have an angle (a) of 50° or more and 65° or less with respect to the front-rear direction. That is, the angle between the main light paths (M) of the light-emitting diode (210) can be 100° or more and 130° or less. Preferably, the main light path (M) of the light-emitting diode (210) can have an angle (a) of 54° with respect to the front-rear direction. That is, the angle between the main light paths (M) of the light-emitting diode (210) can be 108°.

[0152] FIG. 10 is a drawing showing the front view of the light source module shown in FIG. 4. FIG. 11 is a drawing showing the relationship between the light source module shown in FIG. 4 and the diffuser plate.

[0153] In the following, the distance between the approximate centers of each of the plurality of light-emitting diodes (210) can be called the pitch (pitch, x, y), and the distance between the diffuser plate (130) and the substrate (112) can be called the optical distance (optical distance, OD, h).

[0154] The pitch (x) along the left-right direction of the plurality of light sources (111) may be 4 mm or more and 14 mm or less. Specifically, the pitch (x) along the left-right direction of the centers of each of the plurality of light sources (111) may be 4 mm or more and 14 mm or less.

[0155] Additionally, the pitch (y) along the vertical direction of the plurality of light sources (111) may be 4 mm or more and 14 mm or less. Specifically, the pitch (y) along the vertical direction of the centers of each of the plurality of light sources (111) may be 4 mm or more and 14 mm or less.

[0156] The pitch (x) according to the left-right direction of each center of the plurality of light sources (111) may be provided differently from the pitch (y) according to the up-down direction of each center of the plurality of light sources (111). The pitch (x) according to the left-right direction of each center of the plurality of light sources (111) may be provided to be greater than the pitch (y) according to the up-down direction of each center of the plurality of light sources (111), but less than or equal to 1.1 times the pitch (y) according to the up-down direction of each center. Alternatively, the pitch (x) according to the left-right direction of each center of the plurality of light sources (111) may be provided to be approximately the same as the pitch (y) according to the up-down direction of each center of the plurality of light sources (111). The pitch (x) according to the left-right direction and the pitch (y) according to the up-down direction may satisfy the following relationship.

[0157] (2nd interval) ≤ 1st interval ≤ 1.1*(2nd interval)

[0158] Referring to FIG. 11, the optical distance (h) between the substrate (112) and the diffuser plate (130) can be set to be 1.5 mm or more and 4.5 mm or less. Specifically, the distance from the front of the substrate (112) through the air layer to the rear of the diffuser plate (130) can be set to be 1.5 mm or more and 4.5 mm or less.

[0159] A light source device (100) according to one embodiment of the present invention may be configured such that the pitch (x) according to the left-right direction of the centers of each of the plurality of light sources (111) satisfies the following relationship with the optical distance (h) between the substrate (112) and the diffuser plate (130). That is, within the range satisfying the following relationship, the light source device (100) according to one embodiment of the present invention may be configured such that the pitch (x) according to the left-right direction of the centers of each of the plurality of light sources (111) is 4 mm or more and 14 mm or less, and the optical distance (h) between the substrate (112) and the diffuser plate (130) is 1.5 mm or more and 4.5 mm or less.

[0160] 2.2 ≤ (x) / h ≤ 4.5

[0161] Specifically, when the pitch (x) according to the left-right direction of each of the centers of the plurality of light sources (111) is 1.1 times the pitch (y) according to the up-down direction, and the optical distance (h) between the substrate (112) and the diffuser plate (130) is 1.5 mm or more and 2.5 mm or less, the pitch (x) and the optical distance (h) can satisfy the following relationship.

[0162] 3.5 ≤ (x) max / h ≤ 4.5

[0163] In addition, when the pitch (x) according to the left-right direction of each of the centers of the plurality of light sources (111) is 1.1 times the pitch (y) according to the up-down direction, and the optical distance (h) between the substrate (112) and the diffuser plate (130) is 2.5 mm or more and 3.5 mm or less, the pitch (x) and the optical distance (h) can satisfy the following relationship.

[0164] 3.2 ≤ (x) max / h ≤ 4.2

[0165] In addition, when the pitch (x) according to the left-right direction of each of the centers of the plurality of light sources (111) is 1.1 times the pitch (y) according to the up-down direction, and the optical distance (h) between the substrate (112) and the diffuser plate (130) is 3.5 mm or more and 4.5 mm or less, the pitch (x) and the optical distance (h) can satisfy the following relationship.

[0166] 2.2 ≤ (x) max / h ≤ 3.5

[0167] Preferably, when the centers of each of the plurality of light sources (111) have a pitch (x) in the left-right direction that is 1.1 times the pitch (y) in the up-down direction and the optical distance (h) between the substrate (112) and the diffuser plate (130) is 3.5 mm or more and 4.5 mm or less, the pitch (x) and the optical distance (h) can satisfy the following relationship.

[0168] 2.5 ≤ (x) max / h ≤ 3.5

[0169] A display device (10) according to one embodiment of the present invention may have an optical distance (h) set to 3 mm and a pitch (x) set to 9.8 mm, and accordingly, the ratio of the pitch (x) to the optical distance (h) may be about 3.27.

[0170] A display device (10) according to one embodiment of the present invention may have an optical distance (h) set to 3.1 mm and a pitch (x) set to 11 mm, and accordingly, the ratio of the pitch (x) to the optical distance (h) may be about 3.55.

[0171] According to this configuration, the light source device (100) and the display device (10) having the same according to one embodiment of the present invention can reduce the number of light sources, thereby securing cost competitiveness. In addition, the light source device (100) and the display device (10) having the same according to one embodiment of the present invention can reduce the optical distance (h), thereby reducing the thickness.

[0172] FIG. 12 is a diagram illustrating experimental results when the numerical range of the pitch / optical distance of a display device falls outside the numerical range according to one embodiment of the present invention. FIG. 13 is a diagram illustrating experimental results when the numerical range of the pitch / optical distance of a display device falls within the numerical range according to one embodiment of the present invention.

[0173] If the ratio of the pitch (x) of the light source device of the display device to the optical distance (h) falls outside the numerical range below, a moiré phenomenon may occur prominently, as shown in FIG. 12.

[0174] 2.5 < (x) / h < 4.5

[0175] However, the display device (10) according to one embodiment of the present invention can significantly eliminate the moiré phenomenon as shown in FIG. 13 when the ratio of the pitch (x) of the light source device (100) and the optical distance (h) preferably satisfies the following numerical range.

[0176] 2.5 < (x) / h < 4.5

[0177] As described above, the disclosed embodiments have been explained with reference to the attached drawings. Those skilled in the art will understand that the disclosed embodiments may be implemented in forms different from the disclosed embodiments without changing the technical concept or essential features of the disclosed embodiments. The disclosed embodiments are illustrative and should not be interpreted restrictively. Explanation of the symbols

[0178] 10; display device 11; main body 12; screen 20; liquid crystal panel 30; Driver IC 50; control assembly 60; Power assembly 100, 200, 300, 400; light source device 110; Light source module 111; light source 112; substrate 120; reflective sheet 120a; through hole 210; light-emitting diode 220; Optical dome 260; reflective layer

Claims

Claim 1 It includes a diffuser plate; and a light source module disposed behind the diffuser plate; wherein the light source module comprises a substrate; and a plurality of light-emitting diodes mounted on the substrate; A light source device comprising: a plurality of reflective layers each provided on the front surface of the plurality of light-emitting diodes; wherein the plurality of reflective layers are configured such that the main optical emitted from each of the plurality of light-emitting diodes has an angle of 50° or more and 65° or less with respect to the front-rear direction, wherein the distance between the centers of each of the plurality of light-emitting diodes is called the pitch, and the distance between the diffuser plate and the substrate is called the optical distance, wherein the pitch and the optical distance satisfy the following relationship: 2.5 ≤ pitch / optical distance ≤ 4.5; wherein the plurality of light-emitting diodes are arranged along a first direction and a second direction perpendicular to the first direction, wherein the pitch is set to a first distance along the first direction that is greater than the second distance along the second direction, and the first distance along the first direction and the second distance along the second direction satisfy the following relationship: first distance ≤ 1.1 * (second distance) Claim 2 In claim 1, the light source module is a light source device comprising a plurality of optical domes each covering the plurality of light-emitting diodes. Claim 3 delete Claim 4 In claim 1, the light source device wherein the reflective layer is provided as a Distributed Bragg Reflector (DBR). Claim 5 A light source device according to claim 1, wherein the pitch is provided to be 4 mm or more and 14 mm or less. Claim 6 A light source device according to claim 1, wherein the optical distance is provided to be 1.5 mm or more and 4.5 mm or less. Claim 7 delete Claim 8 delete Claim 9 A light source device according to claim 1, wherein when the pitch is a maximum value and the optical distance is 1.5 mm or more and 2.5 mm or less, the pitch and the optical distance satisfy the following relationship: 3.5 ≤ Pitch / Optical Distance ≤ 4.5 Claim 10 A light source device according to claim 1, wherein when the pitch is a maximum value and the optical distance is 2.5 mm or more and 3.5 mm or less, the pitch and the optical distance satisfy the following relationship: 3.2 ≤ Pitch / Optical Distance ≤ 4.2 Claim 11 A light source device according to claim 1, wherein when the pitch is a maximum value and the optical distance is 3.5 mm or more and 4.5 mm or less, the pitch and the optical distance satisfy the following relationship: 2.5 ≤ Pitch / Optical Distance ≤ 3.5 Claim 12 In paragraph 2, the plurality of optical domes are light source devices composed of silicone or epoxy resin. Claim 13 In claim 1, the light source device configured such that the light-emitting diode emits blue light. Claim 14 A light source device for outputting light; and a liquid crystal panel for blocking or passing the light; wherein the light source device includes a diffuser plate and a light source module disposed behind the diffuser plate, and the light source module comprises: a substrate; a plurality of light-emitting diodes mounted on the substrate and arranged along a first direction and a second direction different from the first direction; and a plurality of reflective layers each provided on the front surface of the plurality of light-emitting diodes. A display device comprising: a plurality of optical domes each covering the plurality of light-emitting diodes; wherein the plurality of reflective layers are configured such that the main optical emitted from each of the plurality of light-emitting diodes has an angle of 50° or more and 65° or less with respect to the front-rear direction, wherein the distance between the centers of each of the plurality of light-emitting diodes is called the pitch, and the distance between the diffuser plate and the substrate is called the optical distance, wherein the pitch and the optical distance satisfy the following relationship: 2.2 ≤ pitch / optical distance ≤ 4.5; wherein the pitch is set as a first distance according to the first direction that is greater than the second distance according to the second direction, and the first distance according to the first direction and the second distance according to the second direction satisfy the following relationship: first distance ≤ 1.1 * (second distance) Claim 15 delete Claim 16 delete Claim 17 delete Claim 18 In claim 14, a display device wherein, when the pitch is a maximum value and the optical distance is 1.5 mm or more and 2.5 mm or less, the pitch and the optical distance satisfy the following relationship: 3.5 ≤ Pitch / Optical Distance ≤ 4.5 Claim 19 A display device according to claim 14, wherein the pitch is a maximum value and the optical distance is 2.5 mm or more and 3.5 mm or less, and the pitch and the optical distance satisfy the following relationship: 3.2 ≤ Pitch / Optical Distance ≤ 4.2 Claim 20 A display device according to claim 14, wherein the pitch is a maximum value and the optical distance is 3.5 mm or more and 4.5 mm or less, and the pitch and the optical distance satisfy the following relationship. 2.2 ≤ Pitch / Optical Distance ≤ 3.5

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