Display device

Abstract

A display device is disclosed. A display device of the present invention may include: a display panel; a frame located behind the display panel; a substrate located between the display panel and the frame and coupled to the frame; a light source on the substrate and providing light to the display panel; the cover body is positioned on the substrate and surrounds the side surface of the light source; the light conversion layer is positioned in the cover body and is opposite to the light source; the cover body includes: an air gap formed between the light conversion layer and the light source; and a hole formed through a side surface of the cover body and communicating with the air gap.

Description

Technical Field

[0001] This invention relates to a display device. Background Technology

[0002] With the development of the information society, the requirements for display devices are increasing in various forms. Correspondingly, in recent years, various display devices such as liquid crystal display devices (LCD), plasma display panels (PDP), electroluminescent displays (ELD), vacuum fluorescent displays (VFD), and organic light-emitting diodes (OLED) have been developed and put into use.

[0003] The LCD panel can have a thin film transistor (TFT) substrate and a color substrate facing each other with a liquid crystal layer between them, and can display images using light provided from the backlight unit.

[0004] Recently, there has been increased attention to the image quality of display devices, and color performance or color reproduction that is close to true color has received important attention. Many studies are being conducted on image quality improvements aimed at achieving true color. Summary of the Invention

[0005] The problem that the invention aims to solve

[0006] The purpose of this invention is to solve the aforementioned problems and other issues.

[0007] Another objective is to provide a display device that can improve image quality.

[0008] Another objective is to provide a display device that replaces a light-absorbing layer that converts the color of light from a light source by using a light-converting layer disposed around the light source to convert the color of the light from the light source.

[0009] Another objective is to provide a structure that can minimize the degradation caused by heat in the light conversion layer.

[0010] Another objective is to provide a structure that can improve light efficiency.

[0011] Technical solutions to the problem

[0012] According to one aspect of the invention for achieving the above or other objectives, the display device may include: a display panel; a frame located behind the display panel; a substrate located between the display panel and the frame, and coupled to the frame; a light source located on the substrate, providing light to the display panel; a cover located on the substrate, surrounding the side of the light source; and a light conversion layer located inside the cover, facing the light source; the cover includes: an air gap formed between the light conversion layer and the light source; and a hole formed through the side of the cover, communicating with the air gap.

[0013] Invention Effects

[0014] The effects of the display device of the present invention are explained below.

[0015] According to at least one embodiment of the present invention, a display device capable of improving image quality is provided.

[0016] According to at least one embodiment of the present invention, a display device is provided in which a light-absorbing layer that converts the color of light from a light source is replaced by a light-converting layer disposed around a light source to convert the color of light from the light source.

[0017] According to at least one embodiment of the present invention, a structure is provided that can minimize the degradation caused by heat in the light conversion layer.

[0018] According to at least one embodiment of the present invention, a structure capable of improving light efficiency is provided.

[0019] The scope of applicability of this invention will become clear from the following detailed description. However, since those skilled in the art will readily understand the various changes and modifications within the spirit and scope of this invention, it should be understood that the detailed description and specific embodiments, such as preferred embodiments of the invention, are provided merely as examples. Attached Figure Description

[0020] Figures 1 to 15 This is a diagram illustrating an example of a display device according to an embodiment of the present invention. Detailed Implementation

[0021] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. Unless otherwise specified in the drawing numbers, the same or similar structural elements will be given the same reference numerals, and repeated descriptions thereof will be omitted.

[0022] The suffixes “module” and “section” used for structural elements in the following description are merely for the convenience of writing the specification and do not have any distinguishing meaning or function.

[0023] Furthermore, in describing the embodiments disclosed in this specification, detailed descriptions of relevant prior art have been omitted where it is determined that such detailed descriptions would obscure the essence of the embodiments disclosed in this specification. Additionally, the accompanying drawings are only for aiding understanding of the embodiments disclosed in this specification, and should be understood as not being limited to the drawings, but including all modifications, equivalents, and substitutions within the scope and technical intent of the invention.

[0024] Terms including ordinal numbers, such as "first" and "second," can be used to describe a variety of structural elements; however, these structural elements are not limited by these terms. These terms are used only to distinguish one structural element from another.

[0025] When it is mentioned that a constituent element is "connected" or "linked" to another constituent element, it should be understood that it can be directly connected or linked to the other constituent element, but there may be other constituent elements between them. Conversely, when it is mentioned that a constituent element is "directly connected" or "directly linked" to another constituent element, it should be understood that there are no other constituent elements between them.

[0026] Unless the context clearly indicates otherwise, singular expressions include plural expressions.

[0027] In this application, the terms “comprising” or “having” should be understood as indicating the presence of features, figures, steps, actions, structural elements, components or combinations thereof disclosed in this specification, rather than as precluding the presence or additional possibility of more than one other feature, figure, step, action, structural element, component or combination thereof.

[0028] The directional indications shown in the accompanying drawings (U, D, Le, Ri, F, and R) are for illustrative purposes only and do not limit the technical concepts described in this application.

[0029] Reference Figure 1 The display device 1 may include a display panel 10. The display panel 10 may display images.

[0030] Display device 1 may include a first long side LS1, a second long side LS2 opposite to the first long side LS1, a first short side SS1 adjacent to the first long side LS1 and the second long side LS2, and a second short side SS2 opposite to the first short side SS1. On the other hand, for ease of explanation, the lengths of the first long side LS1 and the second long side LS2 are illustrated and explained as being greater than the lengths of the first short side SS1 and the second short side SS2, but the lengths of the first long side LS1 and the second long side LS2 may also be approximately the same as the lengths of the first short side SS1 and the second short side SS2.

[0031] The direction parallel to the long sides LS1 and LS2 of display device 1 can be called the left-right direction or the first direction DR1. The direction parallel to the short sides SS1 and SS2 of display device 1 can be called the up-down direction or the second direction DR2. The direction perpendicular to the long sides LS1 and LS2 and the short sides SS1 and SS2 of display device 1 can be called the front-back direction or the third direction DR3.

[0032] The direction in which the image is displayed on the display panel 10 can be referred to as the front (F, z) and the opposite direction as the rear (R). The first long side LS1 can be referred to as the top (U, y). The second long side LS2 can be referred to as the bottom (D). The first short side SS1 can be referred to as the left (Le, x). The second short side SS2 can be referred to as the right (Ri).

[0033] The first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 can be referred to as the edge of the display device 1. The location where the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 intersect each other can be referred to as the corner.

[0034] The point where the first short side SS1 intersects with the first long side LS1 can be called the first corner C1. The point where the first long side LS1 intersects with the second short side SS2 can be called the second corner C2. The point where the second short side SS2 intersects with the second long side LS2 can be called the third corner C3. The point where the second long side LS2 intersects with the first short side SS1 can be called the fourth corner C4.

[0035] Reference Figure 2 The display device 1 may include a display panel 10, a front cover 15, a guide panel 13, a backlight unit 20, a frame 60, and a rear cover 70.

[0036] Display panel 10 can form the front side of display device 1 and display images. In display panel 10, a plurality of pixels output RGB (Red, Green, or Blue) of each pixel at a time point to display the image. Display panel 10 can be divided into an active area for displaying images and a de-active area for not displaying images. Display panel 10 may include a front substrate and a rear substrate that are opposite to each other through a liquid crystal layer. Display panel 10 can be referred to as an LCD panel.

[0037] The front substrate may include a plurality of pixels composed of red, green, and blue sub-pixels. The front substrate may output light corresponding to red, green, or blue according to a control signal.

[0038] The back substrate may include a plurality of switching elements. The back substrate can switch pixel electrodes on and off. For example, the pixel electrodes can change the molecular arrangement of the liquid crystal layer according to an externally input control signal. The liquid crystal layer may include liquid crystal molecules. The arrangement of the plurality of liquid crystal molecules can be changed in response to a voltage difference generated between the pixel electrodes and a common electrode. The liquid crystal layer can transmit or block light provided from the backlight unit 20 to the front substrate.

[0039] The front cover 15 can cover at least a portion of the front and side surfaces of the display panel 10. The front cover 15 can be divided into a front cover located on the front of the display panel 10 and a side cover located on the side surfaces. At least one of the front cover and the side cover can be omitted.

[0040] The guide panel 13 can surround the periphery of the display panel 10 and cover the sides of the display panel 10. The guide panel 13 can be combined with or support the display panel 10.

[0041] The backlight unit 20 may be located behind the display panel 10. The backlight unit 20 may include a plurality of light sources. The backlight unit 20 may be attached to the frame 60 in front of the frame 60. The backlight unit 20 may be driven in a global driving mode or a local driving mode such as local dimming or impulsive driving. The backlight unit 20 may include an optical sheet 40 and an optical layer 30.

[0042] The optical sheet 40 can uniformly transmit light from the light source to the display panel 10. The optical sheet 40 can be composed of multiple layers. For example, the optical sheet 40 may include a prism sheet or a diffuser sheet. For example, the optical sheet 40 may be a double brightness enhancement film (DBEF). On the other hand, the bonding portion 40d of the optical sheet 40 can be bonded to the front cover 15, the frame 60, or the rear cover 70.

[0043] The frame 60 can be located behind the backlight unit 20 and can support a plurality of components of the display device 1. For example, components such as the backlight unit 20 and a PCB (Printed Circuit Board) with a plurality of electronic components can be integrated into the frame 60.

[0044] The back cover 70 can cover the rear of the frame 60. The back cover 70 can be attached to the frame 60 and / or the front cover 15.

[0045] Reference Figure 3 and Figure 4 The backlight unit 20 may include an optical layer 30 and an optical sheet 40. The optical layer 30 may include a substrate 32, at least one light source 34, a reflector 36, and a diffuser 39.

[0046] The substrate 32 can be attached to the front side of the frame 60. The substrate 32 can have a plate shape or be composed of a plurality of straps spaced apart from each other in a vertical direction. Alternatively, the substrate 32 can also have a fork shape comprising a long, extending first plate and a plurality of second plates intersecting the first plate. The substrate 32 can be made of at least one of polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon. The substrate 32 can be a PCB (Printed Circuit Board).

[0047] At least one light source 34 may be mounted on the substrate 32. A plurality of light sources 34 may be spaced apart from each other on the substrate 32. Electrode patterns for connecting the adapter and the light source 34 may be formed on the substrate 32. For example, carbon nanotube electrode patterns for connecting the light source 34 and the adapter may be formed on the substrate 32.

[0048] For example, the light source 34 can be a light-emitting diode (LED) chip or an LED package including at least one LED chip. The light source 34 can be composed of colored LEDs emitting at least one color from red, green, blue, etc., or white LEDs. The colored LEDs can include at least one of red, green, and blue LEDs. The light source 34 can be referred to as a light component 34.

[0049] The reflector 36 may be located in front of the substrate 32. The reflector 36 may be located in an area other than the area where the light source 34 is formed on the substrate 32. The reflector 36 may have a hole 36a for providing the light source 34.

[0050] Furthermore, the reflector 36 may include at least one of a metal and a metal oxide as the reflective material. For example, the reflector 36 may include a metal and / or metal oxide with high reflectivity, such as at least one of aluminum (Al), silver (Ag), gold (Au), and titanium dioxide (TiO2). For example, resin may be deposited or coated on the light source 34 and / or the reflector 36. The resin can diffuse the light from the light source 34. Thus, the reflector 36 can reflect the light from the light source 34 or the light reflected from the diffuser plate 39 forward.

[0051] A diffuser plate 39 can be located in front of the reflector 36. The diffuser plate 39 diffuses the light from the light source 34. A support member 36b can be located between the reflector 36 and the diffuser plate 39, supporting the back side of the diffuser plate 39. Thus, an air gap can be formed between the reflector 36 and the diffuser plate 39, allowing the light from the light source 34 to diffuse more widely through the air gap. The diffuser plate 39 can be referred to as an optical plate 39.

[0052] The optical sheet 40 can be located in front of the diffuser plate 39. The back side of the optical sheet 40 can be in close contact with the diffuser plate 39, and the front side of the optical sheet 40 can be in close contact with or adjacent to the back side of the display panel 10. The optical sheet 40 may include at least one sheet.

[0053] For example, the optical sheet 40 may include a plurality of sheets having different functions from each other. The first optical sheet 40a and the second optical sheet 40b may be prism sheets, and the third optical sheet 40a may be a diffuser sheet. The prism sheets can focus the light emitted from the diffuser plate 39 and provide it to the display panel 10. The diffuser sheets can make the light distribution more uniform by preventing the light emitted from the diffuser plate 39 from being partially dense. The number and / or position of the prism sheets and the diffuser sheets may be varied.

[0054] Reference Figure 5 and Figure 6 The backlight unit 20' may include an optical layer 30' and an optical sheet 40. The optical layer 30' may be located between the frame 60 and the display panel 10. The optical layer 30' may be supported by the frame 60. The optical layer 30' may include a substrate 32', at least one light source 34', a reflective sheet 37, and a light guide plate 38.

[0055] The light guide plate 38 can be located between the frame 60 and the optical sheet 40, and can be supported by the frame 60. The light guide plate 38 can be referred to as the optical sheet 38.

[0056] The substrate 32' may be adjacent to the periphery of the light guide plate 38 and may be bonded to one side of the guiding panel 13. For example, the substrate 32' may be adjacent to the lower edge of the light guide plate 38. The substrate 32' may be made of at least one of polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon. The substrate 32' may be a PCB (Printed Circuit Board).

[0057] At least one light source 34' may be mounted on the substrate 32'. A plurality of light sources 34' may be spaced apart from each other on the substrate 32'. Electrode patterns for connecting the adapter and the light source 34' may be formed on the substrate 32'. For example, carbon nanotube electrode patterns for connecting the light source 34' and the adapter may be formed on the substrate 32'.

[0058] For example, the light source 34' can be a light-emitting diode (LED) chip or an LED package including at least one LED chip. The light source 34' can be composed of a colored LED emitting at least one color from red, green, blue, etc., or a white LED. The colored LED can include at least one of red, green, and blue LEDs. The light source 34' can be referred to as a light component 34'.

[0059] The reflector 37 may be located between the frame 60 and the light guide plate 38, and may be supported by the frame 60. The reflector 37 may include at least one of a metal and a metal oxide as the reflective material. For example, the reflector 37 may include a metal and / or metal oxide with high reflectivity, such as at least one of aluminum (Al), silver (Ag), gold (Au), and titanium dioxide (TiO2).

[0060] Thus, the light source 34' can provide light to the edge of the light guide plate 38. The light flowing into the light guide plate 38 can be directed forward by the light guide plate 38 and the reflector 37.

[0061] Reference Figure 7 and Figure 8 The display panel 10 may include a front substrate 10c, a back substrate 10b, and a color filter 10a. The color filter 10a may be located between the front substrate 10c and the back substrate 10b. A liquid crystal layer and a TFT may be further attached between the front substrate 10c and the back substrate 10b. A first polarizing film (not shown) may be located on the front side of the front substrate 10c, and a second polarizing film (not shown) may be located on the back side of the back substrate 10b.

[0062] Light sources 34 and 34' can provide light to the optical sheet 40. The light dispersed and / or focused from the optical sheet 40 can be provided to the display panel 10. The display panel 10 can use this light to display images.

[0063] Reference Figure 7 For example, lens 35 may cover light source 34 and may be fixed or attached to substrate 32. Lens 35 may include at least one of silicon, polymethyl methacrylate (PMMA), and polycarbonate (PC).

[0064] Reference Figure 8 For example, encapsulation material 110 can cover the light source 34'. Cup 120 can be fixed or attached to substrate 32', and encapsulation material 110 can fill the recessed grooves of cup 120. Encapsulation material 110 can include silicon or resin material.

[0065] The light-absorbing layer 50 can be located in the path of light supplied from the light sources 34, 34' and directed toward the display panel 10. The light-absorbing layer 50 can be located on the back or front of the optical sheet 40. The light-absorbing layer 50 can be formed, bonded, or deposited on the back or front of the optical sheet 40. The light-absorbing layer 50 can be referred to as a high-chromaticity film 50 and may include a QD film (Quantum Dot Enhancement Film) and / or a NOM film (Nano Organic Material Film).

[0066] For example, the light L1 from light sources 34 and 34' can be blue light. The light-absorbing layer 50 can include a green phosphor (GP) and a red phosphor (RP). The green phosphor GP can be particles ranging from 3 to 7 micrometers (SrGa2S4:Eu), and the red phosphor RP can be particles smaller than 1 micrometer ((Sr,Ca)AlSiN3:Eu). The green phosphor GP can be referred to as a green quantum dot (GP), and the red phosphor RP can be referred to as a red quantum dot (RP).

[0067] In this configuration, the light L1 from light sources 34 and 34' can excite the green phosphor GP and the red phosphor RP. The green phosphor GP emits green light, and the red phosphor RP emits red light. Consequently, a portion of the light L1 from light sources 34 and 34' is not absorbed or reflected by the green phosphor GP and the red phosphor RP, but instead appears as blue light through the light-absorbing layer 50. This blue light can then be mixed with the green and red light emitted from the light-absorbing layer 50 to produce white light.

[0068] However, manufacturing the light-absorbing layer 50 can be quite costly. Furthermore, since the light-absorbing layer 50 is spaced apart from the light sources 34, 34', light loss may occur. Additionally, the heat generated during backlight unit operation may cause deformation of the light-absorbing layer 50, such as wrinkles.

[0069] On the other hand, refer to Figures 11 to 15 The cover 130, which has a light conversion layer 131 separated from the light sources 34, 34' described later, and the cover 140, 140', etc., which are combined with the cover 130, can be provided instead of the light-absorbing layer 50, which has the aforementioned problems.

[0070] However, refer to Figures 11 to 15 The cover 130, which has a light conversion layer 131 separated from the light sources 34 and 34' described later, and the covers 140 and 140' attached to the cover 130, etc., also have technical significance in preventing the degradation of the light conversion layer 131, and can therefore be used together with the light-absorbing layer 50 to achieve white light. In this case, compared with the case where the light-absorbing layer 50 achieves white light alone, the concentration of phosphor in the light-absorbing layer 50 can be reduced, thereby reducing the manufacturing cost of the light-absorbing layer 50.

[0071] Reference Figure 9 and Figure 10 The phosphor 110P can be located around the light sources 34 and 34', and the aforementioned light-absorbing layer 50 can be omitted. The phosphor 110P can be in powder form. For example, a liquid encapsulation material 110 mixed with the phosphor 110P can cover the light sources 34 and 34' and be cured.

[0072] For example, the light from light source 34' and 34' can be blue-series light. Phosphor 110P can include yellow phosphor (YP). Phosphor 110P can also include red phosphor (RP). Yellow phosphor YP can be micrometer-sized YAG (Yttrium Aluminum Garnet) or La3Si6N. 11 LuAG (Al5Lu3O) 12 (Sr,Ca)AlSiN3:Eu or (Sr,Ca,Ba)2SiN8:Eu can be micrometer-sized. Yellow phosphors (YP) can be called yellow quantum dots (YP). Red phosphors (RP) can be called red quantum dots (RP).

[0073] In this configuration, the light from light sources 34 and 34' can excite the yellow phosphor YP and the red phosphor RP. The yellow phosphor YP emits yellow light, and the red phosphor RP emits red light. Therefore, a portion of the light from light sources 34 and 34' is not absorbed or reflected by phosphor 110P, but instead appears as blue light through the encapsulation material 110. This blue light can then mix with the yellow and red light emitted from phosphor 110P within the encapsulation material 110 to achieve white light L2.

[0074] As another example, the light from light sources 34 and 34' can be blue light. Phosphor 110P can include green phosphor (GP) and red phosphor (RP). Green phosphor GP can be particles ranging from 3 to 7 micrometers (SrGa2S4:Eu), and red phosphor RP can be particles smaller than 1 micrometer ((Sr,Ca)AlSiN3:Eu). Green phosphor GP can be referred to as green quantum dot (GP), and red phosphor RP can be referred to as red quantum dot (RP).

[0075] In this configuration, the light from light sources 34 and 34' can excite the green phosphor GP and the red phosphor RP. The green phosphor RP emits green light, and the red phosphor RP emits red light. Consequently, a portion of the light from light sources 34 and 34' is not absorbed or reflected by phosphor 110P, but instead appears as blue light through the encapsulation material 110. This blue light can then be mixed with the green and red light emitted from phosphor 110P to achieve white light.

[0076] However, the heat from the light sources 34 and 34' can be transferred to the phosphor 110P, which is in contact with the light sources 34 and 34', thus causing the phosphor 110P to deteriorate.

[0077] Reference Figure 11 The light sources 34 and 34' can be mounted on the substrates 32 and 32' in a CSP (Chip Scale Package) manner.

[0078] A cup 120 may surround the sides of light sources 34, 34' and may be attached to or bonded to substrates 32, 32'. The width (diameter) of the recessed, groove-shaped internal space of the cup 120 may gradually widen in the direction of light travel from light sources 34, 34'. The inner surface of the cup 120 may be referred to as a guide wall (or surface), and may have a minimum width (Da, minimum diameter) at the position closest to substrates 32, 32' and a maximum width (Db, maximum diameter) at the position furthest from substrates 32, 32'. The cup 120 may be made of silicon or resin. Light may not be able to pass through the cup 120, and the cup 120 may be white.

[0079] Encapsulation material 110 can fill the internal space of cup 120. Encapsulation material 110 can have an inverted truncated cone shape. Encapsulation material 110 can include silicon or resin material.

[0080] Thus, the light from light sources 34 and 34' can pass through the encapsulation material 110 and be guided along the inner surface of the cup 120.

[0081] The cover 140 may surround the side of the cup 120 and may be spaced apart from the side of the cup 120. The cover 140 may be bonded to or attached to the substrates 32, 32'. The cover 140 may have a hollow cylinder shape or a polygonal prism shape (e.g., a tetragonal prism). For example, the cover 140 may be formed of a heat-resistant polymer material such as PCT (Polycyclohexylenedimethylene Terephthalate) or EMC (Epoxy Mold Compound).

[0082] The cover 130 may be bonded to or formed on the inner surface of the housing 140 and may face the encapsulation material 110 and cup 120 covering the light sources 34, 34'. The cover 130 may be spaced apart from the encapsulation material 110 and cup 120. The cover 130 may include a light conversion layer 131, a light-incident portion 133, and a light-emitting portion 132.

[0083] The light conversion layer 131 can be bonded to or formed on the inner surface of the cover 140, and can seal a portion of the hollow space of the cover 140. The light conversion layer 131 can have a shape corresponding to the cross-section of the cover 140. The light conversion layer 131 may include a phosphor (130P). The phosphor 130P can be a QD (130P, Quantum Dot) or NOM (130P, Nano Organic Material). The phosphor 130P can be referred to as the light conversion material 130P.

[0084] The light-incident portion 133 and the light-exit portion 132 can be bonded to or formed on the inner surface of the housing 140, sealing off a portion of the hollow space of the housing 140. The light-incident portion 133 can be located between the light conversion layer 131 and the encapsulation material 110 covering the light sources 34, 34'. The light-exit portion 132 can be opposite to the light-incident portion 133 with reference to the light conversion layer 131. The light-incident portion 133 and the light-exit portion 132 can include transparent materials. The light-incident portion 133 and the light-exit portion 132 can function as heat insulation components. For example, the light-incident portion 133 and the light-exit portion 132 can include benzene-based or methyl-based silicon or resin materials.

[0085] An air gap 130S can be formed around the encapsulation material 110 and the cup 120. The inner surface of the cover 140 can be separated from the cup 120 by an air gap 130S. The light-receiving portion 133 can be separated from the encapsulation material 110 by an air gap 130S.

[0086] Therefore, the cover 130 with the light conversion layer 131 can separate the light sources 34, 34' from the cover encapsulation material 110 through the air gap 130S, which can prevent the deterioration of the light conversion layer 131. In addition, the light-incident portion 133 and the light-exit portion 132 can function as heat insulation components for the light conversion layer 131, thereby protecting the light conversion layer 131 from the effects of heat.

[0087] The hole 140h can be formed by penetrating the side of the cover 140 and can communicate with the air gap 130S. The hole 140h can face the side of the cup 120 and can be located at the front end of the cup 120 (within...). Figure 11 Based on the reference, the upper part of cup 120 is further back (with... Figure 11 Based on the reference point, the position is on the lower side. This minimizes light leakage from the light source 34, 34' through the aperture 140h. The aperture 140h can be referred to as slit 140h, air duct 140h, or air passage 140h.

[0088] Therefore, the air gap 130S can communicate with the external space of the housing 140 through the hole 140h. That is, air can flow from the outside of the housing 140 to the air gap 130S or from the air gap 130S to the outside of the housing 140 through the hole 140h. Due to this airflow, the temperature rise of the air gap 130S can be minimized. In this case, compared with the case where the space formed by the air gap 130S is sealed without the hole 140h, it may be more advantageous to prevent the deterioration of the light conversion layer 131. In addition, in a structure that minimizes the heat transfer to the light conversion layer 131, it may be advantageous to increase the current value flowing in the light sources 34, 34'.

[0089] Reference Figure 12 The light sources 34 and 34' can be mounted on the substrates 32 and 32' using a POB (Package On Board) method. In this case, a conductive frame 320 can be configured between the light sources 34 and 34' and the substrates 32 and 32'.

[0090] A cup 120' may surround the sides of light sources 34, 34' and may be attached to or bonded to the frame 320. The width (diameter) of the recessed, groove-shaped internal space of the cup 120' may gradually widen in the direction of light travel from the light sources 34, 34'. The inner surface of the cup 120' may be referred to as a guide wall (or surface), having a minimum width Da at its closest point to the frame 320 and a maximum width (maximum diameter) Db at its furthest point from the frame 320. The cup 120' may be made of silicone or resin. Light may not pass through the cup 120', and the cup 120' may be white.

[0091] Encapsulation material 110 can fill the internal space of cup 120'. Encapsulation material 110 can have an inverted truncated cone shape. Encapsulation material 110 can include silicon or resin material.

[0092] Thus, the light from light sources 34 and 34' can pass through the encapsulation material 110 and be guided along the inner surface of the cup 120.

[0093] A cover 140' may be located on a cup 120' and may surround a portion of the cup 120'. The cover 140' may be positioned on a groove 120g' formed in the cup 120', and the inner surface of the cover 140' may be spaced apart from the cup 120'. The cover 140' may be bonded to or attached to the groove 120g'. The cover 140' may have a hollow cylinder shape or a polygonal prism shape (e.g., a tetrahedral prism). For example, the cover 140' may be formed of a heat-resistant polymer material such as EMC (Epoxy Mold Compound) or PCT (PolyCyclohexylenedimethylene Terephthalate).

[0094] The cover 130 may be bonded to or formed on the inner surface of the housing 140 and may face the encapsulation material 110 and cup 120' covering the light sources 34, 34'. The cover 130 may be spaced apart from the encapsulation material 110 and cup 120'. The cover 130 may include a light conversion layer 131, a light-incident portion 133, and a light-emitting portion 132.

[0095] The light conversion layer 131 can be bonded to or formed on the inner surface of the cover 140', and can seal a portion of the hollow space of the cover 140'. The light conversion layer 131 can have a shape corresponding to the cross-section of the cover 140'. The light conversion layer 131 may include a phosphor (130P). The phosphor 130P can be QD (130P, Quantum Dot) or NOM (130P, Nano Organic Material). The phosphor 130P can be referred to as light conversion material 130P.

[0096] The light-incident portion 133 and the light-exit portion 132 can be bonded to or formed on the inner surface of the housing 140', sealing off a portion of the hollow space of the housing 140. The light-incident portion 133 can be located between the light conversion layer 131 and the encapsulation material 110 covering the light sources 34, 34'. The light-exit portion 132 can be opposite to the light-incident portion 133 with reference to the light conversion layer 131. The light-incident portion 133 and the light-exit portion 132 can include transparent materials. The light-incident portion 133 and the light-exit portion 132 can function as heat insulation components. For example, the light-incident portion 133 and the light-exit portion 132 can include benzene-based or methyl-based silicon or resin materials.

[0097] An air gap 130S' can be formed around the encapsulation material 110 and the cup 120'. The inner side of the cover 140' can be separated from the cup 120' by an air gap 130S'. The light-receiving portion 133 can be separated from the encapsulation material 110 by an air gap 130S'.

[0098] Therefore, the cover 130 with the light conversion layer 131 can be separated from the encapsulation material 110 covering the light sources 34, 34' by the air gap 130S', which can prevent the deterioration of the light conversion layer 131. In addition, the light-incident portion 133 and the light-exit portion 132 can function as heat insulation components for the light conversion layer 131, thereby protecting the light conversion layer 131 from the effects of heat.

[0099] The hole 140h' can be formed by penetrating the side of the cover 140' and can communicate with the air gap 130S'. The hole 140h' can face the side of the cup 120' and can be located at the front end of the cup 120 (within...). Figure 12 Based on the reference, the upper part of cup 120 is further back (with... Figure 12 Based on the reference point, the position is below. This minimizes light leakage from the light source 34, 34' through the aperture 140h'. The aperture 140h' can be referred to as a slit 140h', an air duct 140h', or an air passage 140h'.

[0100] Therefore, the air gap 130S' can communicate with the external space of the housing 140' through the hole 140h'. That is, air can flow in from the outside of the housing 140' through the hole 140h' and out from the air gap 130S' to the outside of the housing 140'. Due to this airflow, the temperature rise of the air gap 130S' can be minimized. In this case, compared with the case where the space formed by the air gap 130S' is sealed without the hole 140h', it may be more advantageous to prevent the deterioration of the light conversion layer 131. In addition, in a structure that minimizes the heat transferred to the light conversion layer 131, it may be advantageous to increase the current value flowing in the light sources 34, 34'.

[0101] Refer again Figure 11 and 12 The light from light sources 34 and 34' can be guided along the inner surfaces of cups 120 and 120' and pass through the encapsulation material 110. Then, the light can pass sequentially through air gaps 130S and 130S', light-incident section 133, light conversion layer 131, and light-exit section 132.

[0102] For example, the light from light source 34' and 34' can be blue light. Phosphor 130P can include yellow phosphor (YP). Phosphor 130P can also include red phosphor (RP). Yellow phosphor YP can be micrometer-sized YAG (Yttrium Aluminum Garnet) or La3Si6N. 11 LuAG (Al5Lu3O) 12(Sr,Ca)AlSiN3:Eu or (Sr,Ca,Ba)2SiN8:Eu can be micrometer-sized. Alternatively, the red phosphor RP can also be K2SiF6:Mn. 4+ (KSF). The yellow fluorescent YP can be called the yellow quantum dot (YP). The red fluorescent RP can be called the red quantum dot (RP).

[0103] In this configuration, the light L1 from light sources 34 and 34' can excite the yellow phosphor YP and the red phosphor RP. The yellow phosphor YP emits yellow light, and the red phosphor RP emits red light. Therefore, a portion of the light L1 from light sources 34 and 34' is not absorbed or reflected by the phosphor 130P, but instead appears as blue light through the light conversion layer 131. This blue light mixes with the yellow and red light emitted from the phosphor 130P in the light conversion layer 131 to achieve white light L3. This white light L3 can be provided to the optical sheet 40 and the display panel 10 (see reference). Figure 9 and Figure 10 ).

[0104] As another example, the light from light sources 34 and 34' can be blue light. Phosphor 130P can include green phosphor (GP) and red phosphor (RP). The green phosphor GP can be particles ranging from 3 to 7 micrometers (SrGa2S4:Eu), and the red phosphor RP can be particles smaller than 1 micrometer ((Sr,Ca)AlSiN3:Eu). The green phosphor GP can be referred to as a green quantum dot (GP), and the red phosphor RP can be referred to as a red quantum dot (RP).

[0105] In this configuration, the light L1 from light sources 34 and 34' can excite the green phosphor GP and the red phosphor RP. The green phosphor RP emits green light, and the red phosphor RP emits red light. Therefore, a portion of the light L1 from light sources 34 and 34' is not absorbed or reflected by the phosphor 130P, but instead appears as blue light through the light conversion layer 131. This blue light can then be mixed with the green and red light emitted from the phosphor 130P to achieve white light L3. This white light L3 can be provided to the optical sheet 40 and the display panel 10 (see reference). Figure 9 and Figure 10 ).

[0106] Reference Figure 13 and Figure 14 The cover 140 can have a quadrangular prism shape. A hole 140h can be formed from one side of the cover 140 located on the substrates 32 and 32' towards the inside of the cover 140. In this case, a portion of the cover 140 can form the boundary of the hole 140h, and can be located on the substrates 32 and 32', and can be referred to as a leg. For example, a first leg 141, a second leg 142, a third leg 143, and a fourth leg 144 can be formed at the corners of the cover 140, and can be located on the substrates 32 and 32'. A first hole 140a can be formed between the fourth leg 144 and the third leg 143, and a second hole 140b can be formed between the first leg 141 and the second leg 142. A third hole 140c can be formed between the second leg 142 and the third leg 143, and a fourth hole 140d can be formed between the first leg 141 and the fourth leg 144.

[0107] Alternatively, the cover 140 can be cylindrical. The hole 140h can be formed from one side of the cover 140 located on the substrate 32, 32' towards the inside of the cover 140, and can be arc-shaped. For example, a plurality of 140h can be spaced apart from each other in the circumferential direction of the cover 140.

[0108] Reference Figure 13 and Figure 14 The description of the aforementioned cover 140 and hole 140h can be applied in the same way. Figure 12 The cover is 140' and the hole is 140h'.

[0109] Reference Figure 15 The cover 140 can have a polygonal prism or cylindrical shape. The hole 140h can be formed through the side of the cover 140 and can be spaced apart from the substrates 32, 32'. For example, a plurality of holes 140h can be spaced apart from each other in the peripheral or circumferential direction of the cover 140.

[0110] Reference Figure 15 The description of the aforementioned cover 140 and hole 140h can be applied in the same way. Figure 12 The cover is 140' and the hole is 140h'.

[0111] Reference Figures 1 to 15A display device according to one aspect of the present invention may include: a display panel; a frame located behind the display panel; a substrate located between the display panel and the frame, and coupled to the frame; a light source located on the substrate, providing light to the display panel; a cover located on the substrate, surrounding the side of the light source; and a light conversion layer located inside the cover, facing the light source; the cover includes: an air gap formed between the light conversion layer and the light source; and a hole formed through the side of the cover, communicating with the air gap.

[0112] The light conversion layer may include a phosphor, which converts the color of the light from the light source.

[0113] The display device may further include a light-incident portion made of a light-transmitting material, the light-incident portion being located inside the cover and between the light conversion layer and the light source; the air gap may be formed between the light-incident portion and the light source.

[0114] The display device may further include a light-emitting part made of a light-transmitting material, which is located inside the cover and is opposite to the light-incident part with respect to the light conversion layer.

[0115] The display device may further include: a cup located inside the cover and surrounding the side of the light source; and an encapsulation material located inside the cup and covering the light source; the air gap being formed around the cup and the encapsulation material.

[0116] The encapsulation material may have an inverted truncated cone shape; the inner surface of the cup may have a shape corresponding to the encapsulation material to guide the movement of the light from the light source.

[0117] The hole can be located further back than the front end of the cup.

[0118] The cup may include: a first portion located inside the cover; a second portion located outside the cover; and a groove formed between the first portion and the second portion, wherein the cover is disposed in the groove.

[0119] The cover may have a cylindrical or polygonal prism shape; the hole may be formed from one end of the cover located on the substrate toward the inside of the cover or may be separately provided from the one end of the cover.

[0120] The holes may include a plurality of holes spaced apart from each other in the peripheral direction of the cover.

[0121] The display device may further include: an optical plate located between the display panel and the light source; and an optical sheet located between the display panel and the optical plate.

[0122] The above-described embodiments of the present invention, or other embodiments thereof, are not mutually exclusive or distinct. The above-described embodiments of the present invention, or other embodiments thereof, can be used in combination or in combination of their respective configurations or functions.

[0123] For example, it indicates that configuration A described in a particular embodiment and / or the accompanying drawings can be combined with configuration B described in other embodiments and / or the accompanying drawings. That is, even if the combination between configurations is not directly described, it indicates that they can be combined unless it is stated that they cannot be combined.

[0124] The detailed description above should not be construed as restrictive in all respects, but should be considered exemplary. The scope of the invention should be determined based on a reasonable interpretation of the appended claims, and all modifications made within the equivalent scope of the invention are included within its scope.

Claims

1. A display device, wherein, The display device includes: a display panel; a frame located at a rear of the display panel; a substrate located between the display panel and the frame and coupled to the frame; a light source located on the substrate and providing light to the display panel; a cover located on the substrate and surrounding a side of the light source; and a light conversion layer located inside the cover and facing the light source. The cover includes: an air gap formed between the light conversion layer and the light source; and a hole formed through a side of the cover and communicating with the air gap.

2. The display device of claim 1, wherein: the light conversion layer includes a phosphor that converts a color of light of the light source.

3. The display device of claim 1, further comprising: a light-in portion of a light-transmissive material located inside the cover, between the light conversion layer and the light source; the air gap is formed between the light-in portion and the light source.

4. The display device of claim 3, further comprising: a light-out portion of a light-transmissive material located inside the cover, on an opposite side of the light conversion layer from the light-in portion.

5. The display device of claim 4, further comprising: a cup located inside the cover and surrounding a side of the light source; and 5. The display device of claim 1, wherein, an encapsulation material located inside the cup and covering the light source; the air gap is formed around the cup and the encapsulation material.

6. The display device of claim 5, wherein: the encapsulation material has a shape of an inverted truncated cone; an inner side of the cup has a shape corresponding to the encapsulation material and guides movement of light of the light source.

7. The display device of claim 5, wherein: the hole is located further rearward than a front end of the cup.

8. The display device of claim 5, wherein: the cup includes: a first portion located inside the cover; a second portion located outside the cover; and a recess formed between the first portion and the second portion, the cover being seated in the recess.

9. The display device of claim 1, wherein: the cover has a shape of a cylinder or a polygonal prism; the hole is formed from an end of the cover located on the substrate toward an inner side of the cover or is provided separately from the end of the cover.

10. The display device of claim 1, wherein: the hole includes a plurality of holes separated from each other in a peripheral direction of the cover.

11. The display device of claim 1, further comprising: an optical plate located between the display panel and the light source; and an optical sheet located between the display panel and the optical plate.

11. The display device of claim 1, wherein, ​ ​ ​ ​

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