Display device and light source apparatus therefor

Abstract

A light source apparatus includes a diffusion plate and a light source module disposed behind the diffusion plate. The light source module includes a substrate, a plurality of light emitting diodes mounted on the substrate, and a plurality of reflection layers respectively disposed on front surfaces of the plurality of light emitting diodes. When a distance between centers of each of the plurality of light emitting diodes is referred to as a pitch, and a distance between the diffusion plate and the substrate is referred to as an optical distance, the pitch and the optical distance satisfy the following expression: 2.2 ≤ pitch / optical distance ≤ 4.5.

Description

Technical Field

[0001] This disclosure relates to a display device and a light source device thereof, and more specifically, to a display device and a light source device thereof including an improved optical structure. Background Technology

[0002] Typically, a display device is an output device that converts acquired or stored electrical information into visual information and displays that visual information to a user, and display devices are used in various fields such as homes or workplaces.

[0003] Display devices include monitor devices connected to personal computers or server computers, portable computer equipment, navigation terminal equipment, ordinary television devices, Internet Protocol Television (IPTV), portable terminal devices (such as smartphones, tablets, personal digital assistants (PDAs), or cellular phones), various display devices for reproducing images (such as advertisements or movies in the industrial field), or various audio / video systems.

[0004] The display device includes a light source module to convert electrical information into visual information, and the light source module includes multiple light sources configured to emit light independently.

[0005] Each of the multiple light sources includes, for example, a light-emitting diode (LED) or an organic light-emitting diode (OLED). For example, LEDs or OLEDs can be mounted on a circuit board or substrate. Summary of the Invention

[0006] Technical issues

[0007] This disclosure aims to provide a display device that can reduce costs.

[0008] Furthermore, this disclosure aims to provide a display device capable of reducing thickness.

[0009] Technical solution

[0010] One aspect of this disclosure provides a light source device, including: a diffuser plate; and a light source module disposed behind the diffuser plate. The light source module includes: a substrate; a plurality of light-emitting diodes (LEDs) mounted on the substrate; and a plurality of reflective layers, respectively disposed on the front surfaces of the plurality of LEDs. When the distance between the centers of each LED is called the spacing, and the distance between the diffuser plate and the substrate is called the optical distance, the spacing and the optical distance satisfy the following expression:

[0011] 2.2≤ Spacing / Optical Distance≤4.5.

[0012] The light source module may include multiple optical domes, each configured to cover the multiple light-emitting diodes.

[0013] Multiple reflective layers can be configured to allow the main light emitted from multiple LEDs to have an angle greater than or equal to 50° but less than or equal to 65° relative to the front-back direction.

[0014] The reflective layer can be configured as a distributed Bragg reflector (DBR).

[0015] The spacing can be greater than or equal to 8mm but less than or equal to 13mm.

[0016] The optical distance can be greater than or equal to 1.5mm but less than or equal to 4.5mm.

[0017] Multiple light-emitting diodes can be arranged along a first direction and a second direction perpendicular to the first direction, and the spacing can be set to a first distance in the first direction, which is greater than a second distance in the second direction.

[0018] The first distance in the first direction and the second distance in the second direction satisfy the following expression:

[0019] First distance ≤ 1.06 × second distance.

[0020] If the pitch is the maximum value, and the optical distance is greater than or equal to 1.5 mm but less than or equal to 2.5 mm, then the pitch and optical distance can satisfy the following expression:

[0021] 3.8 ≤ Spacing / Optical Distance ≤ 4.5.

[0022] If the spacing is the maximum value, and the optical distance is greater than or equal to 2.5 mm but less than or equal to 3.5 mm, then the spacing and optical distance can satisfy the following expression:

[0023] 2.9≤ Spacing / Optical Distance≤3.8.

[0024] If the pitch is the maximum value, and the optical distance is greater than or equal to 3.5 mm but less than or equal to 4.5 mm, then the pitch and optical distance can satisfy the following expression:

[0025] 2.2≤ Spacing / Optical Distance≤2.9.

[0026] Multiple optical domes can be formed from silicone or epoxy resin.

[0027] A light-emitting diode can be configured to emit blue light.

[0028] Another aspect of this disclosure provides a display device, including: a light source device configured to output light; and a liquid crystal panel configured to block or transmit light. The light source device includes: a diffuser plate; and a light source module disposed behind the diffuser plate. The light source module includes: a substrate; a plurality of light-emitting diodes (LEDs) mounted on the substrate and arranged along a first direction and a second direction perpendicular to the first direction; and a plurality of optical domes, each configured to cover the plurality of LEDs. When the distance between the centers of each LED is called the pitch, and the distance between the diffuser plate and the substrate is called the optical distance, the pitch and the optical distance satisfy the following expression:

[0029] 2.2≤ Spacing / Optical Distance≤4.5.

[0030] The light source module may include multiple reflective layers, which are respectively disposed on the front surface of multiple light-emitting diodes.

[0031] Multiple reflective layers can be configured to allow the main light emitted from multiple LEDs to have an angle greater than or equal to 50° but less than or equal to 65° relative to the front-back direction.

[0032] The spacing can be set to a first distance in a first direction, which is greater than a second distance in a second direction, and the first distance in the first direction and the second distance in the second direction satisfy the following expression:

[0033] First distance ≤ 1.06 × second distance.

[0034] If the pitch is the maximum value, and the optical distance is greater than or equal to 1.5 mm but less than or equal to 2.5 mm, then the pitch and optical distance can satisfy the following expression:

[0035] 3.8 ≤ Spacing / Optical Distance ≤ 4.5.

[0036] If the spacing is the maximum value, and the optical distance is greater than or equal to 2.5 mm but less than or equal to 3.5 mm, then the spacing and optical distance can satisfy the following expression:

[0037] 2.9≤ Spacing / Optical Distance≤3.8.

[0038] If the pitch is the maximum value, and the optical distance is greater than or equal to 3.5 mm but less than or equal to 4.5 mm, then the pitch and optical distance can satisfy the following expression:

[0039] 2.2≤ Spacing / Optical Distance≤2.9.

[0040] Beneficial effects

[0041] Display devices can reduce the number of light sources, thereby reducing costs.

[0042] Display devices can reduce optical distance, thereby reducing thickness. Attached Figure Description

[0043] Figure 1 This is a view of the appearance of a display device according to an embodiment of the present disclosure.

[0044] Figure 2 yes Figure 1 An exploded view of the display device shown.

[0045] Figure 3 yes Figure 2 The diagram shows a side cross-sectional view of the liquid crystal panel of the display device.

[0046] Figure 4 yes Figure 2 An exploded view of the light source device shown.

[0047] Figure 5 This is a view showing the coupling between the light source module and the reflector included in the light source device.

[0048] Figure 6 yes Figure 4 The light source included in the light source device shown is a perspective view.

[0049] Figure 7 yes Figure 6 An exploded view of the light source shown.

[0050] Figure 8 It is along Figure 6 The cross-sectional view taken by line A-A' shown in the figure.

[0051] Figure 9 It shows from Figure 8 A view showing the path of the light emitted by the LED.

[0052] Figure 10 It shows Figure 4 The view shows the front surface of the light source module.

[0053] Figure 11 It shows Figure 4 The view shown illustrates the relationship between the light source module and the diffuser plate. Detailed Implementation

[0054] In the following description, similar reference numerals denote similar elements throughout the specification. Well-known functions or constructions are not described in detail, as they would obscure one or more exemplary embodiments with unnecessary detail. Terms such as “unit,” “module,” “component,” and “block” can be embodied in hardware or software. According to embodiments, multiple “units,” “modules,” “components,” and “blocks” may be implemented as a single component, or a single “unit,” “module,” “component,” and “block” may include multiple components.

[0055] It should be understood that when an element is referred to as being “connected” to another element, it can be directly or indirectly connected to the other element, where indirect connection includes “connection via a wireless communication network”.

[0056] Furthermore, when a component “comprises” or “includes” an element, the component may also include other elements without excluding them, unless otherwise specifically described.

[0057] Throughout the description, when one component is "on" another component, this includes not only the case where the component is in contact with the other component, but also the case where there is another component between the two components.

[0058] It should be understood that although the terms “first,” “second,” “third,” etc., may be used in this document to describe various elements, the elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0059] As used in this article, the singular form is intended to include the plural form as well, unless the context explicitly indicates otherwise.

[0060] The identification codes are used for ease of description, not to indicate the order of each step. Each step may be performed in a different order than that shown, unless the context explicitly indicates otherwise.

[0061] Exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0062] Figure 1 This is a view of the appearance of a display device according to an embodiment of the present disclosure.

[0063] Display device 10 is a device that processes image signals received from the outside and visually displays the processed images. In the following description, the display device 10 is illustrated as a television, but this disclosure is not limited thereto. For example, display device 10 can be implemented in various forms such as a monitor, a portable multimedia device, and a portable communication device, and its shape is not limited as long as it can visually display images.

[0064] The display device 10 can be a large outdoor display (LFD) installed on an outdoor surface such as the roof of a building or a bus stop. Outdoor is not limited to the exterior of a building, and therefore, the display device 10 according to one embodiment can be installed anywhere, even indoors, such as subway stations, shopping malls, cinemas, companies, and shops, as long as the display device is accessed by a large number of people.

[0065] Display device 10 can receive content data, including video and audio data, from various content sources and output video and audio data corresponding to the video and audio data. For example, display device 10 can receive content data via a broadcast receiving antenna or cable, receive content data from a content playback device, or receive content data from a content provider's content delivery server.

[0066] like Figure 1 As shown, the display device 10 includes a main body 11, a screen 12 configured to display image I, and a support member 19 disposed below the main body 11 and configured to support the main body 11.

[0067] The main body 11 can form the appearance of the display device 10, and the main body 11 can include components configured to allow the display device 10 to display image I and perform various functions. Although Figure 1 The body 11 shown is in the form of a flat plate, but the shape of the body 11 is not limited to this. For example, the body 11 may have a curved plate shape.

[0068] Screen 12 can be formed on the front surface of the main body 11 and displays image I. For example, screen 12 can display a still image or a moving image. In addition, screen 12 can display a two-dimensional planar image or a three-dimensional image using the user's binocular parallax.

[0069] Multiple pixels P can be formed on screen 12, and the image I displayed on screen 12 can be formed by a combination of light emitted from the multiple pixels P. For example, a single static image can be formed on screen 12 by combining the light emitted from the multiple pixels P into a mosaic.

[0070] Each of the multiple pixels P can emit light of different brightness and different color. In order to emit light of different brightness, each of the multiple pixels P can include a self-emitting panel (e.g., a light-emitting diode panel) configured to emit light directly, or a non-self-emitting panel (e.g., a liquid crystal panel) configured to transmit or block light emitted by a light source device.

[0071] In order to emit light of various colors, multiple pixels P can each include sub-pixels P. R P G and P B Subpixel P R PG and P B It can include a red sub-pixel P that emits red light. R Green sub-pixel P that emits green light G And the blue sub-pixel P that emits blue light B For example, red light can represent a beam of light with a wavelength of approximately 620 nm (nanometer, one billionth of a meter) to 750 nm, green light can represent a beam of light with a wavelength of approximately 495 nm to 570 nm, and blue light can represent a beam of light with a wavelength of approximately 450 nm to 495 nm.

[0072] By combining the red sub-pixel P R Red light, green sub-pixels P G Green light and blue sub-pixels P B Blue light, each of the multiple pixels P can emit light of different brightness and different color.

[0073] Figure 2 yes Figure 1 An exploded view of the display device shown.

[0074] like Figure 2 As shown, various components configured to generate image I on screen S can be located inside the main body 11.

[0075] For example, the main body 11 includes a light source device 100 as a surface light source, a liquid crystal panel 20 configured to block or transmit light emitted from the light source device 100, a control component 50 configured to control the operation of the light source device 100 and the liquid crystal panel 20, and a power component 60 configured to supply power to the light source device 100 and the liquid crystal panel 20. Furthermore, the main body 11 includes a frame 13, a frame intermediate mold 14, a base frame 15, and a back cover 16, which are configured to support and fix the liquid crystal panel 20, the light source device 100, the control component 50, and the power component 60.

[0076] The light source device 100 may include a point light source configured to emit monochromatic light or white light. The light source device 100 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 multiple light sources configured to emit monochromatic light or white light, a diffuser configured to diffuse light incident from the multiple light sources, a reflector configured to reflect light emitted from the rear surface of the multiple light sources and the diffuser, and an optical sheet configured to refract and scatter light emitted from the front surface of the diffuser.

[0077] As described above, the light source device 100 can refract, reflect and scatter light emitted from the light source, thereby emitting uniform surface light forward.

[0078] The configuration of the light source device 100 will be described in more detail below.

[0079] Figure 3 yes Figure 2 The diagram shows a side cross-sectional view of the liquid crystal panel of the display device.

[0080] The liquid crystal panel 20 is positioned in front of the light source device 100 and blocks or transmits light emitted from the light source device 100 to form image I.

[0081] The front surface of the liquid crystal panel 20 can form the screen 12 of the display device 10, and the liquid crystal panel 20 can form a plurality of pixels P. In the liquid crystal panel 20, the plurality of pixels P can independently block or transmit light from the light source device 100, and the light transmitted through the plurality of pixels P can form an image I displayed on the screen 12.

[0082] For example, such as Figure 3 As shown, 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.

[0083] The first transparent substrate 22 and the second transparent substrate 28 can fixably support the pixel electrode 23, the thin film transistor 24, the liquid crystal layer 25, the common electrode 26, and the color filter 27. The first transparent substrate 22 and the second transparent substrate 28 can be formed of tempered glass or transparent resin.

[0084] The first polarizing film 21 and the second polarizing film 29 are disposed outside the first transparent substrate 22 and the second transparent substrate 28.

[0085] Each of the first polarizing film 21 and the second polarizing film 29 can transmit a specific light beam and block other light beams. For example, the first polarizing film 21 transmits a light beam with a magnetic field vibrating in a first direction and blocks other light beams. Similarly, the second polarizing film 29 transmits a light beam with a magnetic field vibrating in a second direction and blocks other light beams. In this case, the first and second directions can be perpendicular to each other. Therefore, the polarization direction of the light transmitted through the first polarizing film 21 is perpendicular to the vibration direction of the light transmitted through the second polarizing film 29. As a result, typically, light may not pass through both the first polarizing film 21 and the second polarizing film 29 simultaneously.

[0086] The color filter 27 can be disposed inside the second transparent substrate 28.

[0087] Color filter 27 may include a red filter 27R that transmits red light, a green filter 27G that transmits green light, and a blue filter 27B that transmits blue light. The red filter 27R, green filter 27G, and blue filter 27B may be arranged parallel to each other. The area forming color filter 27 corresponds to the aforementioned pixel P. The area forming red filter 27R corresponds to the red sub-pixel PR, and the area forming green filter 27G corresponds to the green sub-pixel P. G Correspondingly, the area forming the blue filter 27B is adjacent to the blue sub-pixel P. B Correspondingly.

[0088] The pixel electrode 23 can be disposed inside the first transparent substrate 22, and the common electrode 26 can be disposed inside the second transparent substrate 28.

[0089] The pixel electrode 23 and the common electrode 26 can be formed of a conductive metal material, and the pixel electrode 23 and the common electrode 26 can generate an electric field to change the arrangement of the liquid crystal molecules 25a that form the liquid crystal layer 25, which will be described below.

[0090] The pixel electrode 23 and the common electrode 26 can be formed of a transparent material and can transmit light incident from the outside. For example, the pixel electrode 23 and the common electrode 26 may include indium tin oxide (ITO), indium zinc oxide (IZO), silver nanowires (Agnanowire), carbon nanotubes (CNT), graphene, or poly(3,4-ethylenedioxythiophene) (PEDOT).

[0091] Thin-film transistor (TFT) 24 is disposed inside the second transparent substrate 22.

[0092] TFT 24 can transmit or block current flowing through pixel electrode 23. For example, in response to turning TFT 24 on (closing) or off (disconnecting) TFT 24, an electric field can be formed or removed between pixel electrode 23 and common electrode 26.

[0093] TFT 24 can be formed from polycrystalline silicon and can be formed through semiconductor processes such as photolithography, deposition and ion implantation.

[0094] 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.

[0095] Liquid crystals represent an intermediate state between solids (crystals) and liquids. Most liquid crystal materials are organic compounds with molecules that are elongated rod-shaped and arranged irregularly in one direction, but may have a regular crystalline shape in other directions. As a result, liquid crystals possess both the fluidity of liquids and the optical anisotropy of crystals (solids).

[0096] Furthermore, liquid crystals exhibit optical properties depending on changes in the electric field. For example, in a liquid crystal, the alignment direction of the molecules forming the liquid crystal can change according to a change in the electric field. In response to the generation of an electric field in the liquid crystal layer 25, the liquid crystal molecules 25a of the liquid crystal layer 25 can align according to the direction of the electric field. In response to the absence of an electric field in the liquid crystal layer 25, the liquid crystal molecules 25a can be arranged irregularly or along an alignment layer (not shown). As a result, the optical properties of the liquid crystal layer 25 can vary depending on the presence or absence of an electric field passing through the liquid crystal layer 25.

[0097] A cable 20a configured to send image data to the liquid crystal panel 20 and a display driver integrated circuit (DDI) (hereinafter referred to as "driver IC") 30 configured to process digital image data and output analog image signals are disposed on one side of the liquid crystal panel 20.

[0098] Cable 20a can electrically connect control component 50 / power component 60 to driver IC 30, and can also electrically connect driver IC 30 to liquid crystal panel 20. Cable 20a may include flexible flat cable or flexible film cable.

[0099] The driver IC 30 can receive image data and power from the control component 50 / power component 60 via cable 20a. The driver IC 30 can also transmit image data and drive current to the liquid crystal panel 20 via cable 20a.

[0100] Furthermore, the cable 20a and the driver IC 30 can be integrated as a thin-film cable, a chip-on-film (COF) package, or a cable-on-trace (TCP) package. In other words, the driver IC 30 can be disposed on the cable 20a. However, this disclosure is not limited thereto, and the driver IC 30 can also be disposed on the liquid crystal panel 20.

[0101] The control component 50 may include control circuitry configured to control the operation of the liquid crystal panel 20 and the light source device 100. The control circuitry may process image data received from an external content source, send the image data to the liquid crystal panel 20, and send dimming data to the light source device 100.

[0102] The power supply component 60 can supply power to the liquid crystal panel 20 and the light source device 100, so as to allow the light source device 100 to output surface light and allow the liquid crystal panel 20 to block or transmit the light from the light source device 100.

[0103] The control component 50 and the power component 60 can be implemented as a printed circuit board and various circuits mounted on the printed circuit board. For example, the power circuit may include capacitors, coils, resistive elements, a processor, and a power circuit board on which capacitors, coils, resistive elements, and a processor are mounted. Furthermore, the control circuit may include a memory, a processor, and a control circuit board on which the memory and processor are mounted.

[0104] The light source device 100 will be described below.

[0105] Figure 4 yes Figure 2 An exploded view of the light source device shown. Figure 5 This is a view showing the coupling between the light source module and the reflector included in the light source device.

[0106] The light source device 100 includes a light source module 110 configured to generate light, a reflector 120 configured to reflect light, a diffuser 130 configured to uniformly diffuse light, and an optical sheet 140 configured to increase the brightness of the emitted light.

[0107] The light source module 110 may include a plurality of light sources 111 configured to emit light, and a substrate 112 configured to support / fix the plurality of light sources 111.

[0108] Multiple light sources 111 can be arranged in a predetermined pattern to allow light to be emitted with uniform brightness. The multiple light sources 111 can be arranged such that the distance between one light source and its adjacent light sources is the same.

[0109] For example, such as Figure 4 As shown, multiple light sources 111 can be arranged in rows and columns. Therefore, multiple light sources can be arranged such that four adjacent light sources form an approximate square. In addition, any one light source can be placed adjacent to four other light sources, and the distance between one light source and the four adjacent light sources can be approximately the same.

[0110] Alternatively, multiple light sources can be arranged in multiple rows, and the light source belonging to each row can be positioned at the center of two light sources belonging to adjacent rows. Thus, multiple light sources can be arranged such that three adjacent light sources form an approximately equilateral triangle.

[0111] In this scenario, one light source can be placed adjacent to six other light sources, and the distance between one light source and the six adjacent light sources can be approximately the same.

[0112] However, the pattern of setting multiple light sources 111 is not limited to the above pattern, and the multiple light sources 111 can be set in various patterns to allow light to be emitted with uniform brightness.

[0113] The light source 111 may employ an element configured to emit monochromatic light (light of a specific wavelength, such as blue light) or white light (e.g., a mixture of red, green, and blue light) in various directions by receiving electrical power. For example, the light source 111 may include a light-emitting diode (LED).

[0114] The substrate 112 can fix multiple light sources 111 to prevent the position of the light sources 111 from changing. In addition, the substrate 112 can supply power to the light sources 111 for the light sources 111 to emit light.

[0115] The substrate 112 can fix multiple light sources 111 and can be configured with a printed circuit board (PCB) of synthetic resin or tempered glass or having conductive power lines formed thereon for supplying power to the light sources 111.

[0116] The reflector 120 can reflect light emitted from multiple light sources 111 in a direction toward or near the front.

[0117] In the reflector 120, a plurality of through holes 120a are formed at positions corresponding to each of the plurality of light sources 111 in the light source module 110. Furthermore, the light sources 111 of the light source module 110 can pass through the through holes 120a and protrude to the front of the reflector 120.

[0118] For example, such as Figure 5 As shown in the upper part, during the assembly of the reflector 120 and the light source module 110, multiple light sources 111 of the light source module 110 are inserted into the through holes 120a formed on the reflector 120. Therefore, as Figure 5 As shown in the lower part, the substrate 112 of the light source module 110 can be located behind the reflector 120, but the multiple light sources 111 of the light source module 110 can be located in front of the reflector 120.

[0119] Therefore, multiple light sources 111 can emit light in front of the reflector 120.

[0120] Multiple light sources 111 can emit light in various directions from the front of the reflector 120. Light can be emitted not only from the light sources 111 toward the diffuser 130, but also from the light sources 111 toward the reflector 120. The reflector 120 can reflect the light emitted toward the reflector 120 toward the diffuser 130.

[0121] Light emitted from light source 111 passes through various objects such as diffuser plate 130 and optical plate 140. Of the incident beam passing through diffuser plate 130 and optical plate 140, some of the incident beam is reflected from the surfaces of diffuser plate 130 and optical plate 140. Reflector plate 120 can reflect the light reflected by diffuser plate 130 and optical plate 140.

[0122] The diffuser plate 130 can be positioned in front of the light source module 110 and the reflector 120, and can make the light emitted from the light source 111 of the light source module 110 evenly distributed.

[0123] As described above, multiple light sources 111 are located at various positions on the rear surface of the light source device 100. Although the multiple light sources 111 are arranged at equal intervals on the rear surface of the light source device 100, uneven brightness may occur depending on the position of the multiple light sources 111.

[0124] The diffuser plate 130 can diffuse the light emitted from multiple light sources 111 within itself, thereby eliminating the uneven brightness caused by the multiple light sources 111. In other words, the diffuser plate 130 can uniformly emit the uneven light from the multiple light sources 111 onto the front surface.

[0125] Optical sheet 140 may include various sheets for improving brightness and brightness uniformity. For example, optical sheet 140 may include diffuser 141, first prism sheet 142, second prism sheet 143, and reflective polarizer 144.

[0126] The diffuser 141 diffuses the light to achieve uniform brightness. The light emitted from the light source 111 can be diffused by the diffuser plate 130 and can be diffused again by the diffuser 141 included in the optical plate 140.

[0127] The first prism sheet 142 and the second prism sheet 143 can increase brightness by converging the light diffused by the diffuser sheet 141. The first prism sheet 142 and the second prism sheet 143 include prism patterns in the shape of triangular prisms, and multiple prism patterns are arranged adjacent to each other to form multiple stripes.

[0128] The reflective polarizer 144 is a polarizing film that can transmit some incident light beams and reflect others to improve brightness. For example, the reflective polarizer 144 can transmit polarized light in the same direction as its predetermined polarization direction and can reflect polarized light in a different direction. Furthermore, the light reflected by the reflective polarizer 144 is recovered within the light source device 100, and thus the brightness of the display device 10 can be improved through light recovery.

[0129] Optical film 140 is not limited to Figure 4 The sheet or film shown may include many different sheets or films, such as protective sheets.

[0130] Figure 6 yes Figure 4 The light source included in the light source device shown is a perspective view. Figure 7 yes Figure 6 An exploded view of the light source shown. Figure 8 It is along Figure 6 The cross-sectional view taken by line A-A' shown in the figure.

[0131] Reference Figures 6 to 8 The light source 111 of the light source device 100 is described.

[0132] As described above, the light source module 110 includes a plurality of light sources 111. The plurality of light sources 111 can protrude from the rear of the reflector 120 to the front of the reflector 120 through the through-hole 120a. Therefore, as... Figure 6 and Figure 7 As shown, a portion of the substrate 112 and the light source 111 can be exposed toward the front of the reflector 120 through the through-hole 120a.

[0133] The light source 111 may include electrical / mechanical structures located in the area defined by the through-hole 120a of the reflector 120.

[0134] Each of the multiple light sources 111 may include a light-emitting diode 210, an optical dome 220, and a reflective layer 260.

[0135] 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. Furthermore, 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.

[0136] The light-emitting diode 210 can convert electrical energy into light energy. In other words, the light-emitting diode 210 can emit light with maximum intensity at a predetermined wavelength to which the power is supplied. For example, the light-emitting diode 210 can emit blue light with a peak at a wavelength indicating blue (e.g., a wavelength between 430 nm and 495 nm).

[0137] The light-emitting diode 210 can be directly attached to the substrate 112 using a chip-on-board (COB) method. In other words, the light source 111 can include a light-emitting diode 210 that is directly attached to the substrate 112 without additional packaging, either as a light-emitting diode chip or a bare light-emitting diode die.

[0138] To reduce the size of the light source 111, a light source module 110 in which flip-chip LEDs 210 are attached to the substrate 112 in an on-board chip manner can be manufactured.

[0139] On the substrate 112, power lines 230 and power pads 240 are provided for supplying power to the flip-chip light-emitting diode 210.

[0140] On the substrate 112, a power line 230 is provided for supplying electrical signals and / or power from the control component 50 and / or the power component 60 to the light-emitting diode 210.

[0141] like Figure 8 As shown, the substrate 112 can be formed by alternately stacking non-conductive insulating layer 251 and conductive conductive layer 252.

[0142] Lines or patterns through which electricity and / or electrical signals pass are formed on conductive layer 252. Conductive layer 252 can be formed of various materials that are conductive. For example, conductive layer 252 can be formed of various metallic materials such as copper (Cu), tin (Sn), aluminum (Al), or alloys thereof.

[0143] The dielectric of insulating layer 251 can insulate the lines or patterns of conductive layer 252. Insulating layer 251 can be formed of a dielectric for electrical insulation (e.g., FR-4).

[0144] The power line 230 can be implemented by lines or patterns formed on the conductive layer 252.

[0145] The power cord 230 can be electrically connected to the light-emitting diode 210 through the power pad 240.

[0146] The power pad 240 can be formed with the power line 230 exposed to the outside.

[0147] A protective layer 253, configured to prevent or suppress damage caused by external impacts and / or by chemical actions (e.g., corrosion) and / or by optical actions, may be formed in the outermost portion of the substrate 112. The protective layer 253 may include photoresist (PSR).

[0148] like Figure 8 As shown, the protective layer 253 can cover the power cord 230 to prevent the power cord 230 from being exposed to the outside.

[0149] For the electrical contact between the power line 230 and the light-emitting diode 210, a window can be formed in the protective layer 253 to expose a portion of the power line 230 to the outside. The portion of the power line 230 exposed to the outside through the window in the protective layer 253 can form a power pad 240.

[0150] Conductive adhesive material 240a is applied to the power pad 240 for electrical contact between the exposed power line 230 and the electrode 210a of the light-emitting diode 210. The conductive adhesive material 240a may be applied within the window of the protective layer 253.

[0151] The electrode 210a of the light-emitting diode 210 is in contact with the conductive adhesive material 240a, and the light-emitting diode 210 can be electrically connected to the power line 230 through the conductive adhesive material 240a.

[0152] The conductive adhesive material 240a may include a solder that is conductive. However, this disclosure is not limited thereto, and the conductive adhesive material 240a may include a conductive epoxy adhesive.

[0153] Power can be supplied to the light-emitting diode 210 via power lines 230 and power pads 240, and the light-emitting diode 210 can emit light in response to the power supply. A pair of power pads 240 can be provided corresponding to each electrode of a pair of electrodes 210a provided in the flip-chip light-emitting diode 210.

[0154] 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.

[0155] The optical dome 220 can have a dome shape formed such that the sphere is cut into a surface excluding its center, or it can have a hemispherical shape formed such that the sphere is cut into a surface including its center. The vertical cross-section of the optical dome 220 can be arcuate or semicircular.

[0156] The optical dome 220 can be formed of silicone or epoxy resin. For example, molten silicone or epoxy resin can be discharged onto the light-emitting diode 210 through a nozzle, and the discharged silicone or epoxy resin can be cured to form the optical dome 220.

[0157] Therefore, the shape of the optical dome 220 can be varied according to the viscosity of the liquid silicone or epoxy resin. For example, when the optical dome 220 is manufactured using silicon with a thixotropic index of approximately 2.7 to 3.3 (suitably 3.0), an optical dome 220 in which the dome ratio (height of the dome / diameter of the base), indicating the ratio of the dome's height to the diameter of the dome's base, can be formed is approximately 0.25 to 0.31 (suitably 0.28). For example, an optical dome 220 formed from silicon with a thixotropic index of approximately 2.7 to 3.3 (suitably 3.0) can have a diameter of approximately 2.5 mm and a height of approximately 0.7 mm.

[0158] The optical dome 220 can be optically transparent or semi-transparent. Light emitted from the light-emitting diode 210 can be emitted to the outside through the optical dome 220.

[0159] In this case, the dome-shaped optical dome 220 can refract light like a lens. For example, light emitted from the light-emitting diode 210 can be refracted by the optical dome 220 and thus dispersed.

[0160] As described above, the optical dome 220 can disperse the light emitted from the light-emitting diode 210 and protect the light-emitting diode 210 from external mechanical and / or chemical or electrical effects.

[0161] The reflective layer 260 may be located in front of the light-emitting diode 210. The reflective layer 260 may be disposed on the front surface of the light-emitting diode 210. The reflective layer 260 may be a multilayer reflective structure in which multiple insulating layers with different refractive indices are alternately stacked. For example, the multilayer reflective structure may be a distributed Bragg reflector (DBR) in which a first insulating layer having a first refractive index and a second insulating layer having a second refractive index are alternately stacked.

[0162] Figure 9 It shows from Figure 8 A view showing the path of the light emitted by the LED.

[0163] Reference Figure 9 The light emitted from the light-emitting diode 210 can be diffused and emitted by the reflective properties of the reflective layer 260. Specifically, the main light emitted from the light-emitting diode 210 can have an angle (a) greater than or equal to 50° but less than or equal to 65° relative to the front-back direction. That is, the angle between the main lights emitted from the light-emitting diode 210 can be greater than or equal to 100° but less than or equal to 130°.

[0164] Figure 10 It shows Figure 4 The view shows the front surface of the light source module. Figure 11 It shows Figure 4 The view shown illustrates the relationship between the light source module and the diffuser plate.

[0165] In the following text, the distance between the approximate centers of each of the plurality of light-emitting diodes 210 may be referred to as the pitch x and y, and the distance between the diffuser plate 130 and the substrate 112 may be referred to as the optical distance (OD) h.

[0166] The distance x between the multiple light sources 111 in the left-right direction can be greater than or equal to 8 mm but less than or equal to 13 mm. Specifically, the distance x between the centers of each of the multiple light sources 111 in the left-right direction can be greater than or equal to 8 mm but less than or equal to 13 mm.

[0167] Furthermore, the vertical spacing y of the multiple light sources 111 can be greater than or equal to 8 mm but less than or equal to 13 mm. Specifically, the vertical spacing y between the centers of each of the multiple light sources 111 can be greater than or equal to 8 mm but less than or equal to 13 mm.

[0168] The left-right spacing x of the centers of each of the multiple light sources 111 can be different from the vertical spacing y of the centers of each of the multiple light sources 111. The left-right spacing x of the centers of each of the multiple light sources 111 can be greater than the vertical spacing y of the centers of each of the multiple light sources 111, but can be less than or equal to 1.06 times the vertical spacing y of the centers of each of the multiple light sources 111. Alternatively, the left-right spacing x of the centers of each of the multiple light sources 111 can be substantially the same as the vertical spacing y of the centers of each of the multiple light sources 111.

[0169] The spacing x in the left-right direction and the spacing y in the up-down direction can satisfy the following expression:

[0170] (Second distance) ≤ (First distance) ≤ 1.06 × (Second distance).

[0171] Reference Figure 11 The optical distance h between the substrate 112 and the diffuser 130 can be greater than or equal to 1.5 mm but less than or equal to 4.5 mm. Specifically, the distance from the front surface of the substrate 112 through the air layer to the rear surface of the diffuser 130 can be greater than or equal to 1.5 mm but less than or equal to 4.5 mm.

[0172] According to one embodiment of the present disclosure, the light source device 100 can be configured to allow the left-right spacing x between the centers of each of the plurality of light sources 111 and the optical distance h between the substrate 112 and the diffuser 130 to satisfy the following expression. That is, in the light source device 100 according to one embodiment of the present disclosure, within the range of satisfying the following expression, the left-right spacing between the centers of each of the plurality of light sources 111 can be greater than or equal to 8 mm but less than or equal to 13 mm, and the optical distance h between the substrate 112 and the diffuser 130 can be greater than or equal to 1.5 mm but less than or equal to 4.5 mm.

[0173] 2.2 ≤ (x) / h ≤ 4.5

[0174] Specifically, if the distance x between the centers of each of the multiple light sources 111 in the left-right direction is 1.06 times the distance y in the up-down direction, and if the optical distance h between the substrate 112 and the diffuser plate 130 is greater than or equal to 1.5 mm but less than or equal to 2.5 mm, then the distance x and the optical distance h can satisfy the following expression:

[0175] 3.8≤(x) max / h≤4.5.

[0176] Furthermore, if the distance x between the centers of each of the multiple light sources 111 in the left-right direction is 1.06 times the distance y in the up-down direction, and if the optical distance h between the substrate 112 and the diffuser plate 130 is greater than or equal to 2.5 mm but less than or equal to 3.5 mm, then the distance x and the optical distance h can satisfy the following expression:

[0177] 2.9≤(x) max / h≤3.8.

[0178] Furthermore, if the distance x between the centers of each of the multiple light sources 111 in the left-right direction is 1.06 times the distance y in the up-down direction, and if the optical distance h between the substrate 112 and the diffuser plate 130 is greater than or equal to 3.5 mm but less than or equal to 4.5 mm, then the distance x and the optical distance h can satisfy the following expression:

[0179] 2.2≤(x) max / h≤3.8.

[0180] Due to this configuration, the light source device 100 and the display device 10 including the light source device 100 according to an embodiment of the present disclosure can reduce the number of light sources, thereby ensuring cost competitiveness. Furthermore, the light source device 100 and the display device 10 including the light source device 100 according to an embodiment of the present disclosure can reduce the optical distance h, thereby reducing the thickness.

[0181] Although this disclosure has been specifically described with reference to exemplary embodiments, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of this disclosure.

Claims

1. A light source device, comprising: Diffuser plate; as well as The light source module is located behind the diffuser plate. The light source module includes: substrate; Multiple light-emitting diodes are mounted on the substrate; and Multiple reflective layers are respectively disposed on the front surface of the multiple light-emitting diodes. When the distance between the centers of each of the plurality of light-emitting diodes is called the spacing, and the distance between the diffuser and the substrate is called the optical distance, the spacing and the optical distance satisfy the following expression: 2.2 ≤ spacing / optical distance ≤ 4.

5. Wherein, the optical distance is greater than or equal to 1.5 mm but less than or equal to 4.5 mm. The plurality of light-emitting diodes are arranged along a first direction and a second direction perpendicular to the first direction. The spacing is set as a first distance in the first direction, which is greater than a second distance in the second direction. Wherein, the first distance and the second distance satisfy the following expression: the first distance ≤ 1.06 × the second distance, and Wherein, if the first distance is 1.06 times the second distance, and the optical distance is greater than or equal to 3.5 mm but less than or equal to 4.5 mm, then the spacing and the optical distance satisfy the following expression: 2.2 ≤ spacing / optical distance ≤ 2.9, or If the first distance is 1.06 times the second distance, and the optical distance is greater than or equal to 1.5 mm but less than or equal to 2.5 mm, then the spacing and the optical distance satisfy the following expression: 3.8 ≤ spacing / optical distance ≤ 4.5, or If the first distance is 1.06 times the second distance, and the optical distance is greater than or equal to 2.5 mm but less than or equal to 3.5 mm, then the spacing and the optical distance satisfy the following expression: 2.9 ≤ spacing / optical distance ≤ 3.

8.

2. The light source device according to claim 1, wherein... The light source module includes multiple optical domes, each configured to cover a plurality of light-emitting diodes.

3. The light source device according to claim 1, wherein... The reflective layer is configured as a distributed Bragg reflector (DBR).

4. The light source device according to claim 2, wherein... The plurality of optical domes are formed of silicone resin or epoxy resin.

5. The light source device according to claim 1, wherein... The light-emitting diode is configured to emit blue light.

6. A display device, comprising: The light source device according to any one of claims 1 to 5 is configured to output light; as well as The liquid crystal panel is configured to block or transmit the light.

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