KR20230103201A - Display appartus - Google Patents

Abstract

A display device is provided. A display device includes a display panel and a light source unit disposed behind the display panel to provide light to the display panel, wherein the light source unit controls a substrate, a light source mounted on the substrate, and a wavelength of light emitted from the light source. A light conversion layer provided to convert the light and being spaced apart from the light source to cover the light source, a sealing member provided to seal the light source and the light conversion layer, and a first protection unit filled between the light source and the light conversion layer. and an encapsulation member including a second protection part filled outside the light conversion layer.

Description

Display device {DISPLAY APPARTUS}

The present disclosure relates to a display device, and more particularly, to a display device having an improved optical structure.

As a type of output device for display, it includes a television, various monitors, and various portable terminals (eg, laptop computers, tablet PCs, and smart phones) and the like.

Display devices need to be supplied with light from a backlight unit, such as a light emitting type that uses a display panel that emits light by itself, such as an organic light emitting diode (OLED), and a liquid crystal display (LCD, liquid crystal display) that does not emit light by itself. It can be classified as a light-receiving type using a display panel that does.

The backlight unit may be classified into a direct type in which the light source is disposed at the rear of the display panel and an edge type in which the light source is disposed at the side of the display panel according to the position of the light source.

The display device may improve color reproducibility through a light conversion member that converts a wavelength of light emitted from a light source. As an example of the light conversion member, there is a quantum dot sheet (QD sheet) provided on the rear side of the display panel, which may cause cost increase and assembly problems of the display device.

One aspect of the present disclosure provides a display device having an improved structure to improve light efficiency.

One aspect of the present disclosure provides a display device with improved manufacturing cost efficiency by minimizing a light conversion member.

One aspect of the present disclosure provides a display device in which process efficiency is improved by integrating a light conversion layer and a protection unit with a light source unit.

One aspect of the present disclosure provides a display device in which an optical distance is minimized by enlarging a half width of a light source.

and a light source unit disposed behind the display panel to provide light to the display panel, wherein the light source unit is provided to convert a substrate, a light source mounted on the substrate, and a wavelength of light emitted from the light source, A light conversion layer spaced apart from each other to cover the light source, a sealing member provided to seal the light source and the light conversion layer, and a first protective part filled between the light source and the light conversion layer and the outside of the light conversion layer. It may include a sealing member including a filled second protection unit.

The first protection part is provided to cover the light source and may contact an inner surface of the light conversion layer facing the light source.

The second protection unit may be provided to cover an outer surface of the light conversion layer from which light passing through the light conversion layer is emitted from the light source.

The light source unit may include a side reflection layer provided to reflect light incident around the side of the light source.

The lateral reflection layer may be provided to surround the circumference of the light source.

The side reflection layer may include an inner reflector provided inside the light conversion layer to reflect light emitted from the light source and pass the reflected light through the light conversion layer.

The side reflection layer may include an outside reflector provided outside the light conversion layer to reflect light transmitted through the light conversion layer.

The outer reflector may integrally extend from the inner reflector.

The side reflection layer may be provided below the light conversion layer and may contact the light conversion layer.

The light source includes a light emitting surface forming an upper surface and a side surface extending downward from the light emitting surface, and the light conversion layer corresponds to an upper surface of the light conversion layer corresponding to the light emitting surface of the light source and the side surface of the light source. and side parts of the light conversion layer, the upper surface of the light conversion layer may cover the light emitting surface of the light source, and the side parts of the light conversion layer and the lateral reflection layer may cover the side surfaces of the light source.

The light source unit may include a back reflection layer provided to reflect light incident to a rear side of the light source.

The light source unit further includes a multi-refraction reflective layer provided on the outer surface of the second protection unit, the multi-refraction reflective layer having a first refractive index and a second refractive index provided on the outer surface of the first reflective layer and having a second refractive index. 2 may include a reflective layer.

The outer surface of the second protector includes a first reflective surface provided on an upper portion of the second protector and a second reflective surface extending downward from the first reflective surface and provided on a side of the second protector, The first reflective surface and the second reflective surface meet to form an edge of the second protection unit, and the first reflective surface may include a first inclined surface that is downwardly inclined toward the center of the light source.

The second reflective surface may include a second inclined surface that is downwardly inclined toward the outer side of the light source.

An outer surface of the second protection unit, from which light passing through the second protection unit is emitted, may be in contact with external air.

A display device according to another example of the present disclosure includes a display panel and a light source unit disposed behind the display panel to provide light to the display panel, wherein the light source unit includes a substrate and a light source disposed in front of the substrate. The light source package includes a light source mounted on the substrate and emitting light, a first protection unit covering the light source, and disposed to be spaced apart from the light source by the first protection unit, and irradiated from the light source. A light conversion layer provided to change the wavelength of light, a second protection unit covering the light conversion layer, a part of the light incident from the light source is reflected to the light conversion layer, and a part of the light passing through the light conversion layer In order to re-reflect, a side reflection layer provided on a side of the light source may be included.

The side reflection layer includes an inner reflector provided inside the light conversion layer to reflect part of the light incident from the light source to the light conversion layer and to re-reflect part of the light passing through the light conversion layer. An external reflector provided outside the layer may be included.

The light source package may further include a back reflection layer provided under the light source to reflect light incident to the rear of the light source.

The second protection unit forms an outer surface of the light source package, and the second protection unit includes a first reflective surface provided on an upper portion and a second reflective surface provided on a side portion extending downward from the first reflective surface, The first reflective surface and the second reflective surface meet to form an edge of the second protection unit, and the first reflective surface may include a first inclined surface that is downwardly inclined toward the center of the light source.

The second reflection surface may include a second inclined surface that is downwardly inclined toward the outer side of the light source.

According to the present disclosure, in a display device, a light conversion layer capable of improving color reproducibility is provided in a light source unit, and a light conversion sheet separately provided in front of the light source unit can be omitted, thereby reducing manufacturing cost and simplifying the manufacturing process. , the thickness can be reduced.

According to the present disclosure, the thickness of the display device can be reduced because the half width of the light source can be increased to minimize the optical distance.

1 is a diagram illustrating an appearance of a display device according to an exemplary embodiment of the present disclosure.
FIG. 2 is an exploded view illustrating main components of the display device shown in FIG. 1 .
FIG. 3 is a diagram illustrating a light source unit according to an exemplary embodiment of the display device shown in FIG. 1 .
FIG. 4 is a diagram illustrating a light source unit according to another embodiment of the display device shown in FIG. 1 .
FIG. 5 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 .
FIG. 6 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 .
FIG. 7 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 .
FIG. 8 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 .
FIG. 9 is an enlarged view of an upper portion of the light source unit shown in FIG. 8 .
FIG. 10 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 .
FIG. 11 is a view showing a state in which a plurality of light source packages of the display device shown in FIG. 1 are provided.

The embodiments described in this specification and the configurations shown in the drawings are only one preferred example of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings in this specification at the time of filing of the present application.

In addition, the same reference numerals or numerals presented in each drawing in this specification indicate parts or components that perform substantially the same function.

In addition, terms used in this specification are used to describe embodiments, and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It does not preclude in advance the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In addition, terms including ordinal numbers such as “first” and “second” used herein may be used to describe various components, but the components are not limited by the terms, and the terms It is used only for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term "and/or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Directions of front, rear, upper, lower, left, and right will be referred to as unified throughout the specification based on the directions shown in FIG. 1 of the accompanying drawings. In FIG. 1 , X-, Y-, and Z-axis directions perpendicular to each other are shown. The X-axis direction means the left-right direction of the display device, the Y-axis direction means the up-down direction of the display device, and the Z-axis direction means the left-right direction of the display device. It means the forward and backward direction of the display device.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an appearance of a display device according to an exemplary embodiment of the present disclosure. FIG. 2 is an exploded view illustrating main components of the display device shown in FIG. 1 .

The display device 1 includes a display panel 10 displaying an image, a light source unit 100 disposed behind the display panel 10 to provide light to the display panel 10, the light source unit 100, and a display. A chassis assembly supporting the panel 10 may be included.

The chassis assembly includes a rear chassis 40 provided to support the light source unit 100, a front chassis 20 provided in front of the rear chassis 40 to support the display panel 10, and a front chassis 20. and a middle mold 30 coupled between the rear chassis 40.

The display panel 10 is formed between a thin film transistor substrate on which thin film transistors are formed in a matrix form, a color filter substrate coupled in parallel to the thin film transistor substrate, and an optical filter substrate injected between the thin film transistor substrate and the color filter substrate to generate optical effects according to changes in voltage or temperature. It may include a liquid crystal whose properties are variable.

The light source unit 100 may be disposed behind the display panel 10 to emit light toward the display panel 10 . The light source unit 100 may have a flat plate shape. The light source unit 100 may be disposed parallel to the liquid crystal panel 10 .

The light source unit 100 may include a substrate 110 and a light source package 120 mounted on a surface of the substrate 110 facing the display panel 10 . This will be described later in detail.

The optical members may be disposed on a movement path of light emitted from the light source package 120 to guide a traveling direction of light, reflect light, diffuse light, or improve light characteristics.

The optical members include a reflector sheet 70 that reflects light to prevent light loss, a diffuser plate 60 that evenly diffuses irregular light emitted from the light source unit 100, and optical characteristics. It may include optical sheets 51 and 52 to improve the optical properties.

The reflective sheet 70 may reflect light emitted from the light source unit 100 or light emitted backward from the diffusion plate 60 to the diffusion plate 60 . The reflective sheet 70 may be disposed in front of the light source unit 100 so as to come into close contact with the light source unit 100 .

The reflective sheet 70 may have a plurality of openings 71 formed to correspond to the plurality of light source packages 120 . Each of the plurality of light source packages 120 may be disposed inside the corresponding opening 71 .

The diffusion plate 60 can evenly diffuse light emitted from the light source unit 100 and support the optical sheets 51 and 52 . The diffusion plate 60 can evenly diffuse the light incident on its incident surface and emit it to its output surface.

The optical sheets 51 and 52 may be disposed in front of the diffusion plate 60 to improve optical characteristics of light emitted from the diffusion plate 60 . The optical sheets 51 and 52 include a diffuser sheet to offset the pattern of the diffuser plate 60, a prism sheet to improve luminance by concentrating light, and other optics to prevent external impact or inflow of foreign matter. A protection sheet that protects the sheet, a dual brightness enhancement film (DBEF) that transmits one polarized light and reflects the other polarized light to improve luminance, and the like.

The rear chassis 40 may be disposed behind the light source unit 100 . The rear chassis 40 may have a plate shape in which an approximately rim portion is bent forward. The light source unit 100 may be accommodated between the rear chassis 40 and the front chassis 20 .

The rear chassis 40 may include a rear base portion on which the light source unit 100 is installed, and a rear side portion formed at upper, lower, left, and right edges of the rear chassis 40 to be combined with the middle mold 30 .

The rear chassis 40 may function to dissipate heat generated from a heating element such as the light source 130 to the outside. To this end, the rear chassis 40 may be formed of various metal materials such as aluminum and SUS, or plastic materials such as ABS.

The front chassis 20 may have a frame shape having an opening 23 through which the front surface 11 of the display panel 10 is exposed. The front chassis 20 includes a front side portion formed at the upper, lower, left, and right edges of the front chassis 20 to be coupled with the middle mold 30, and a panel support portion protruding inward from the front side portion to support the display panel 10. can do.

The middle mold 30 may support the display panel 10 , the diffusion plate 60 , and the optical sheets 51 and 52 and maintain a distance between the diffusion plate 60 and the optical sheets 51 and 52 . The middle mold 30 may be coupled between the front chassis 20 and the rear chassis 40 .

The middle mold 30 may be formed in a frame shape having an opening 31 through which light emitted from the diffusion plate 60 passes. The middle mold 30 may include a frame portion to which the front chassis 20 and the rear chassis 40 are coupled, and a central protrusion protruding inward from the frame portion. The central protrusion may support the display panel 10 , the diffusion plate 60 , and the optical sheets 51 and 52 .

FIG. 3 is a diagram illustrating a light source unit according to an exemplary embodiment of the display device shown in FIG. 1 . The light source unit 100 may include a substrate 110 and a light source package 120 . The light source package 120 may include a light source 130 , a light conversion layer 140 and an encapsulation member 200 . The sealing member 200 may include a first protection unit 150 and a second protection unit 160 .

A light source package 120 may be provided in front of the substrate 110 .

A light source 130 may be mounted on the substrate 110 . A driving power line for supplying driving power to the light source 130 may be formed on the substrate 110 and may be connected to a signal cable (not shown) and a backlight driving circuit (not shown). The substrate 110 may be provided to reflect light emitted from the light source 130 .

The light source 130 may be provided to emit light. The light source 130 may have a flip chip shape in which device electrodes are formed on the side surface 132 or the bottom surface 133 (described later in FIG. 7). In addition, the light source 130 includes various bumps, solder, etc. A signal transmission medium of may be installed, and may be of various shapes such as a vertical type and a horizontal type having a signal transmission medium such as a wire.

A light emitting diode (LED) chip may be used as the light source 130 . The LED chip may be provided to irradiate blue-based light. The LED chip includes a blue QD electroluminescent element, a blue fluorescent electroluminescent element, a blue thermally activated delayed fluorescent electroluminescent element, and a blue phosphorescent electroluminescent element. At least one of them may be formed.

The light source 130 may include a light emitting surface 131 forming an upper surface and emitting light emitted from the light source 130 , at least one side surface 132 , and a bottom surface 133 . The light source 130 may have a substantially hexahedral shape, and at least one side surface 132 may include four side surfaces.

Hereinafter, the light conversion layer 140 and the sealing member 200 will be described in detail.

Conventional display devices include a light conversion sheet for converting a wavelength of light emitted from a light source to improve color reproducibility of light emitted from a light source. A quantum dot sheet was mainly used as the light conversion sheet, and protective films were placed on both sides of the quantum dot sheet to protect the quantum dot sheet. That is, the quantum dot sheet is disposed to have a predetermined distance from the light source inside the display device to prevent thermal deformation due to heat generated from the light source, and is disposed together with a protective film to prevent penetration of moisture or oxygen from the outside. It became.

Accordingly, the thickness of the display device increases according to the arrangement of the quantum dot sheet inside the display device, and the production cost of the quantum dot sheet and the protective film increases.

To solve this problem, a display device has been developed in which a quantum dot sheet is directly installed on a light source unit instead of a quantum dot sheet. A problem in which the reliability of the configuration having quantum dots is further deteriorated has occurred.

In order to solve the above problems, the display device according to the present disclosure may include a configuration having quantum dots without having a quantum dot sheet to improve reliability against heat and moisture.

In detail, the light source unit 100 is provided to convert the wavelength of light emitted from the light source 130 and is spaced apart from the light source 130 to cover the light source 130, the light conversion layer 140, the light source 130 and the sealing member 200 provided to seal the light conversion layer 140, the first protective part 150 filled between the light source 130 and the light conversion layer 140 and the outside of the light conversion layer 140 It may include a sealing member 200 including a second protection unit 160 filled in.

The first protection unit 150 may be formed to surround the light source 130 to protect the light source 130 . The first protection unit 150 may be formed to contact the light emitting surface 131 and the side surface 132 of the light source 130 . The first protection unit 150 may be provided to cover the mounting surface 111 of the substrate 110 adjacent to the light source 130 .

The first protection unit 150 may fill a space between the light source 130 and the light conversion layer 140 . The first protection unit 150 may be provided to contact the inner surface 141 of the light conversion layer 140 facing the light source 130 . The first protection unit 150 is disposed between the light conversion layer 140 and the light source 130 to prevent the light conversion layer 140 from being deteriorated or damaged by the light source 130, thereby reducing its function. . The first protection unit 150 may protect the light conversion layer 140 from an external environment such as moisture, oxygen, or heat.

The first protection unit 150 may be provided to allow light emitted from the light source 130 to pass through. The first protection unit 150 may be made of a light transmissive material.

The light conversion layer 140 may be disposed on an outer surface of the first protection unit 150 . The inner surface 141 of the light conversion layer may be provided to surround the first protection unit 150 . The light conversion layer 140 may be spaced apart from the light source 130 by the first protection unit 150 .

The light conversion layer 140 may include a plurality of quantum dots, and the plurality of quantum dots may convert a wavelength of light emitted from the light source 130 . For example, wavelengths of some of the blue-based light emitted from the LED chip may be converted into green-based light, red-based light, or yellow-based light. Color reproducibility of the light source 130 may be improved by using the light conversion layer 140 .

The light conversion layer 140 may convert a wavelength of light irradiated from the light source 130 and passing through the first protection unit 150 . Light emitted from the light source 130 may pass through the inner surface 141 of the light conversion layer and be emitted to the outer surface 142 of the light conversion layer. A part of the light passing through the light conversion layer 140 may have a change in wavelength. Light passing through the light conversion layer 140 may be incident to the second protection unit 160 .

The light conversion layer 140 may cover the light source 130 . The light conversion layer 140 may cover the light emitting surface 131 and the side surface 132 of the light source 130 so that all of the light emitted from the light source 130 may pass through the light conversion layer 140 . The light conversion layer 140 may have a cover shape covering the light source 130 .

The light conversion layer 140 may include a light conversion layer upper surface portion 145 corresponding to the light emitting surface 131 of the light source 130 . The light conversion layer 140 may include a light conversion layer side part 146 corresponding to the side surface 132 of the light source 130 .

The upper surface portion 145 of the light conversion layer and the side portion 146 of the light conversion layer may be connected to each other. The side part 146 of the light conversion layer may extend downward from the top part 145 of the light conversion layer. The side portion 146 of the light conversion layer may be provided by being bent from the top portion 145 of the light conversion layer.

The upper surface portion 145 of the light conversion layer may cover the light emitting surface 131 of the light source 130 . The side part 146 of the light conversion layer may cover the side surface 132 of the light source 130 . That is, all of the light emitted from the light source 130 may pass through the light conversion layer 140 .

In this drawing, the light conversion layer 140 is shown in a hexahedral shape corresponding to the shape of the hexahedral light source 130, but the present disclosure is not limited thereto. For example, the light conversion layer 140 may have a dome shape to cover the light source 130 .

The light conversion layer 140 may be sprinkled on the first protection unit 150, covered in a film form, or formed in a sheet form such as a film. That is, the light conversion layer 140 may be provided in the form of a layer or a member.

The second protection unit 160 may be formed to surround the light conversion layer 140 to protect the light conversion layer 140 . The second protection part 160 may be formed to contact the outer surface 142 of the light conversion layer. The second protection unit 160 may be provided to cover the substrate 110 .

The second protection unit 160 may cover the outer surface 142 of the light conversion layer to which light passing through the light conversion layer 140 from the light source 130 is emitted. An inner surface of the second protection unit 160 may contact the outer surface 142 of the light conversion layer. An outer surface of the second protection unit 160 from which light passing through the second protection unit 160 is emitted may be exposed to the outside.

The second protection unit 160 may protect the light conversion layer 140 by preventing the light conversion layer 140 from being exposed to the outside. The second protection unit 160 may protect the outer surface 142 of the light conversion layer.

The second protection unit 160 may be provided to allow light emitted from the light source 130 to pass through. The second protection unit 160 may be made of a light transmissive material.

Since the light source unit 100 includes the light conversion layer 140 , the light conversion sheet separately disposed in front of the light source unit 100 may be omitted. In addition, since the light source unit 100 includes the first protection unit 150 and the second protection unit 160, the protection films disposed in front of the light source unit 100 and disposed on both sides of the light conversion sheet can be omitted. can That is, since the light source unit 100 includes the light conversion layer 140, the first protection unit 150, and the second protection unit 160, the manufacturing cost is reduced, the process is simplified, and the display device 1 thickness can be reduced.

FIG. 4 is a diagram illustrating a light source unit according to another embodiment of the display device shown in FIG. 1 . FIG. 5 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 . FIG. 6 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 . FIG. 7 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 .

Referring to FIGS. 4 to 7 , the light source unit 100 may include reflective layers 210 and 220 that reflect light emitted from the light source 130 . The light source package 120 may include reflective layers 210 and 220 . The reflective layers 210 and 220 may be disposed around the light source 130 to reflect light on a light path.

The reflective layers 210 and 220 may include an epoxy resin composition, a silicone resin composition, a modified epoxy resin composition such as a silicone-modified epoxy resin, a modified silicone resin composition such as an epoxy-modified silicone resin, a polyimide resin composition, a modified polyimide resin composition, and a polyphthal. Resins such as amide, polycarbonate resin, polyphenylene sulfide, liquid crystal polymer, ABS resin, phenol resin, acrylic resin, and PBT resin may be applied.

In addition, these resins may contain light-reflective reflective materials such as titanium oxide, silicon dioxide, titanium dioxide, zirconium dioxide, potassium titanate, alumina, aluminum nitride, boron nitride, mullite, chromium, white-based or metallic-based components. there is.

The reflective layer may include a side reflective layer 210 and a back reflective layer 220 .

Referring to FIG. 4 , the light source unit 100 may include a side reflection layer 210 to reflect light incident to the side of the light source 130 . The light source package 120 may include a lateral reflection layer 210 .

The lateral reflection layer 210 may be provided around the side of the light source 130 . The lateral reflection layer 210 may be provided to surround the circumference of the light source 130 . The lateral reflection layer 210 may contact the side surface 132 of the light source 130 . However, the lateral reflection layer 210 may be provided to be spaced apart from the side surface 132 of the light source 130 .

The lateral reflection layer 210 may be provided in various shapes surrounding the light source 130 . In this drawing, the lateral reflection layer 210 surrounds the side surface 132 of the light source 130 and is shown as a plate with a flat upper surface, but the present disclosure is not limited thereto. For example, the top surface of the side reflection layer 210 may include an inclined surface. In detail, the upper surface of the side reflection layer 210 may include an inclined surface inclined downward toward the light source 130 . In addition, when viewed from above, the lateral reflection layer 210 may be provided in various shapes such as circular, triangular, quadrangular, polygonal, and elliptical as a whole.

The side reflection layer 210 may include an inner reflector 211 provided inside the light conversion layer 140 and an outer reflector 212 provided outside the light conversion layer 140 . The inner reflector 211 and the outer reflector 212 may be integrally extended and formed.

The side reflection layer 210 may contact the light conversion layer 140 . The lateral reflection layer 210 may be provided below the light conversion layer 140 . An upper surface of the lateral reflection layer 210 may contact the light conversion layer 140 and a lower surface of the lateral reflection layer 210 may contact the substrate 110 .

The side reflective layer 210 may contact the encapsulation member 200 . The inner reflector 211 may contact the first protection unit 150 . The outer reflector 212 may contact the second protection unit 160 .

The lateral reflection layer 210 may reflect light emitted from the light source 130 at various angles. The side reflection layer 210 may forwardly or laterally reflect light irradiated from the light source 130 and incident around the side of the light source.

The lateral reflection layer 210 may be provided below the light conversion layer 140 and contact the light conversion layer 140 . The side reflection layer 210 is provided adjacent to the light conversion layer 140 and may reflect light emitted from the light source 130 or re-reflect light transmitted through the light conversion layer 140 .

The light conversion layer upper surface portion 142 may cover the light emitting surface 131 of the light source 130, and the light conversion layer side portion 146 and the side reflection layer 210 may cover the side surface 132 of the light source 130. there is. Accordingly, some of the light emitted from the light source 130 may be incident to the inner surface 141 of the light conversion layer, and the other part may be reflected by the side reflection layer 210 and may be incident to the inner surface 141 of the light conversion layer.

The inner reflector 211 may be provided inside the light conversion layer 140 to reflect light emitted from the light source 130 toward the light conversion layer 140 so as to pass through the light conversion layer 140 . Accordingly, the light emitted from the light source 130 may be reflected at various angles by the inner reflector 211 and may be incident to the light conversion layer 140 . The inner reflector 211 may guide light emitted from the light source 130 to pass through the light conversion layer 140 .

That is, some of the light emitted from the light source 130 may be directed toward the substrate 110 , and the light may be reflected by the inner reflector 211 and guided to pass through the light conversion layer 140 . Light passing through the light conversion layer 140 may be emitted through the outer surface 142 of the light conversion layer.

The outer reflector 212 may be provided outside the light conversion layer 140 to reflect light transmitted through the light conversion layer 140 . Accordingly, the light transmitted through the light conversion layer 140 may be re-reflected at various angles by the outer reflector 212 and emitted.

Referring to FIG. 5 , the light source unit 100 may include a back reflection layer 220 provided under the light source 130 to prevent light emission toward the rear of the light source 130 . The light source package 120 may include a back reflection layer 220 .

The back reflection layer 220 may be provided behind the light source 130 . In this drawing, the back reflection layer 220 is illustrated as being provided inside the light conversion layer 140 as an example, but the present disclosure is not limited thereto. For example, the back reflection layer 220 may be provided extending to the outside of the light conversion layer 140 .

The back reflection layer 220 may forwardly or laterally reflect light incident to the rear of the light source 130 . For example, the back reflection layer 220 transmits light emitted from the light source 130 and reflected back by the light conversion layer 140, the first reflection surface 170, the second reflection surface 180, and the like, back to the front. Or it can be re-reflected laterally.

The back reflection layer 220 may be provided in front of the substrate 110 and behind the light source 130 . The back reflection layer 220 may contact the lower surface 133 of the light source 130 . The back reflection layer 220 may contact the substrate 110 . The back reflection layer 220 may be provided on the mounting surface 111 of the substrate 110 . The back reflection layer 220 may be provided to electrically connect the light source 130 and the substrate 110 .

Referring to FIG. 6 , the light source unit 100 may include both a side reflection layer 210 and a back reflection layer 220 . The light source package 120 may include both a side reflection layer 210 and a back reflection layer 220 .

The side reflection layer 210 and the back reflection layer 220 may be integrally formed. The reflective layers 210 and 220 may be provided on the substrate 110 .

The reflective layers 210 and 220 may reflect light emitted from the light source 130 and directed to the side or rear of the light source 130 . The reflective layers 210 and 220 may reflect light toward the front or side of the substrate 110 .

Referring to FIG. 7 , the light source 130 is an LED chip and may be a flip chip type LED chip including device electrodes 135 formed on side surfaces 132 . The flip chip type LED may be mounted on the substrate 110 through the device electrode 135 . The device electrode 135 may include an n-type device electrode 135a and a p-type device electrode 135b.

The substrate 110 may include an n-type substrate electrode and a p-type substrate electrode to correspond to the n-type device electrode 135a and the p-type device electrode 135b. The n-type device electrode 135a and the p-type device electrode 135b may be electrically connected to the n-type substrate electrode and the p-type substrate electrode, respectively.

In this drawing, the device electrode 135 is shown in contact with the side surface 132 of the light source 130 as an example, but the present disclosure is not limited thereto. The device electrode 135 may be formed on the lower surface 133 of the light source 130 .

The back reflection layer 220 may be provided between the n-type device electrode 135a and the p-type device electrode 135b. The back reflection layer 220 may contact the device electrode 135 and may be provided on the lower surface 133 of the light source 130 .

The lateral reflection layer 210 may be provided on the upper surface of the device electrode 135 . The lateral reflection layer 210 may be provided between the device electrode 135 and the light conversion layer 140 . The side reflection layer 210 may contact the device electrode 135 and the light conversion layer 140 .

FIG. 8 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 .

Light emitted from the light source 130 disposed behind the display panel 10 may be directly incident to the display panel 10 . At this time, in the display panel 10, the light is concentrated in an area of the display panel 10 positioned perpendicularly to the light emitting surface 131 of the light source 130, causing a problem in that the luminance of the display panel 10 becomes non-uniform. can

Accordingly, the light source package 120 according to the present disclosure includes the first reflective surface 170 and the second reflective surface 180 to maximize the half width of the light source.

The outer surface of the light source package 120 may include a first reflective surface 170 and a second reflective surface 180 . The outer surface of the sealing member 200 may include a first reflective surface 170 and a second reflective surface 180 . The second protection unit 160 may form an outer surface of the sealing member 200 and may include a first reflective surface 170 provided on an upper portion and a second reflective surface 180 provided on a side portion.

The second reflective surface 180 may extend downward from the first reflective surface 170 . The second reflective surface 180 may form a circumferential surface of the sealing member 200 . The second reflective surface 180 and the first reflective surface 170 may meet to form the corner 161 of the second protector. The outer surface of the light source package 120 includes the first reflective surface 170 and the second reflective surface 180 to reflect light at various angles.

The first reflection surface 170 may include a first inclined surface 171 inclined downward toward the center of the light source 130 . The first inclined surface 171 may increase the half-width of the light source by diffusing light laterally. The first inclined surface 171 may be recessed into the first reflective surface 170 in a conical or quadrangular pyramidal shape. The first inclined surface 171 may be inclined at various angles toward the light source 130 . The light emitted from the light source 130 may be reflected toward the substrate 110 and diffused by being reflected in accordance with the angle at which the first inclined surface 171 is inclined.

The second reflection surface 180 may include a second inclined surface 181 that is downwardly inclined toward the outer side of the light source 130 . The second inclined surface 181 may increase the half width of the light source by diffusing the light laterally. The second inclined surface 181 may be inclined toward the light source 130 at various angles. Light emitted from the light source 130 may be reflected and diffused in accordance with the angle at which the second inclined surface 181 is inclined.

The first reflective surface 170 and the second reflective surface 180 may include not only smooth surfaces but also uneven surfaces.

FIG. 9 is an enlarged view of an upper portion of the light source unit shown in FIG. 8 .

The light source package 120 may include a multi-refracting reflective layer 190 . A multi-refraction reflective layer 190 may be provided on the outer surface of the encapsulation member 200 . A multi-refraction reflective layer 190 may be provided on the outer surface of the second protection unit 160 .

Light emitted from the light source 130 may be reflected at various angles by the multi-refracting reflective layer 190 . The multi-refraction reflective layer 190 may include a reflective layer whose refractive index continuously changes. The multi-refracting reflective layer 190 may increase the half-width of the light source 130 by variously changing light paths.

The multi-refraction reflective layer 190 may include a first reflective layer 191 having a first refractive index and a second reflective layer 192 provided on an outer surface of the first reflective layer 191 and having a second refractive index. The first refractive index and the second refractive index may be different from each other.

A third reflective layer 193 , a fourth reflective layer 194 , a fifth reflective layer 195 , and a sixth reflective layer 196 may be provided on an outer surface of the second reflective layer 192 . The refractive indices of each reflective layer may be different from each other. In this drawing, the multi-refraction reflective layer 190 includes the first reflective layer 191 to the sixth reflective layer 196 as an example, but the present disclosure is not limited thereto. The multi-refraction reflective layer 190 may include only the first reflective layer 191 and the second reflective layer 192 . Alternatively, a reflective layer provided on an outer surface of the sixth reflective layer 196 may be further included.

The multi-refracting reflective layer 190 may be provided on the first reflective surface 170 and/or the second reflective surface 180 . In this drawing, it is shown that the multi-refraction reflective layer 190 is provided on the first reflective surface 170 including the first inclined surface 171 as an example, but the multi-refraction reflective layer 190 is provided on the second reflective surface 180. may be Light incident to the first reflective surface 170 and/or the second reflective surface 180 by the multi-refracting reflective layer 190 may be reflected at various angles.

FIG. 10 is a diagram illustrating a light source unit according to still another embodiment of the display device shown in FIG. 1 .

The light source package 120 may include a light conversion layer 140 to convert a wavelength of light emitted from the light source 130 . The light source package 120 includes the first protection unit 150 and the second protection unit 160 to prevent degradation of the function of the light conversion layer 140 .

The light source package 120 includes the reflective layers 210 and 220 and the first reflective surface 170 and the second reflective surface 180 to increase the half width of the light source 130 and improve light efficiency. In addition, by implementing various shapes of the light source package 120 , the display device 1 may be slimmed down by reducing an optical distance.

The light source package 120 is integrally formed to simplify the manufacturing process.

FIG. 11 is a view showing a state in which a plurality of light source packages of the display device shown in FIG. 1 are provided.

The light source unit 100 may include a plurality of light source packages 120a, 120b, and 120c. A plurality of light source packages 120a, 120b, and 120c may be disposed in front of the substrate 110 . The plurality of light source packages 120a, 120b, and 120c may be continuously disposed along the longitudinal direction (Y-axis direction) of the substrate 110 . The plurality of light source packages 120a, 120b, and 120c may be spaced apart at predetermined intervals along the length direction of the substrate 110 and disposed.

A display panel 10 may be provided in front of the light source unit 100 , and light emitted from the light source unit 100 may be provided to the display panel 10 .

In the above, specific embodiments have been illustrated and described. However, it is not limited to the above-described embodiments, and those skilled in the art will be able to make various changes without departing from the gist of the technical idea of the invention described in the claims below. .

1 display unit
10 display panel
100 light units
110 substrate
120 light source package
130 light source
140 light conversion layer
150 first protection unit
160 second protection unit
170 first reflective surface
171 first slope
180 second reflective surface
181 second slope
190 multi-refracting reflective layer
210 side reflective layer
211 inner reflector
212 outer reflector
220 rear reflective layer

Claims (20)

display panel; and
A light source unit disposed behind the display panel to provide light to the display panel; includes,
The light source unit
Board;
a light source mounted on the substrate;
A light conversion layer provided to convert the wavelength of light irradiated from the light source and covering the light source while being spaced apart from the light source; and
a sealing member provided to seal the light source and the light conversion layer, including a first protection part filled between the light source and the light conversion layer and a second protection part filled outside the light conversion layer;
A display device comprising a. According to claim 1,
The first protection unit is provided to cover the light source and contacts an inner surface of the light conversion layer facing the light source. According to claim 1,
The second protection unit is provided to cover an outer surface of the light conversion layer from which light passing through the light conversion layer is emitted from the light source. According to claim 1,
The display device of claim 1 , wherein the light source unit includes a lateral reflection layer provided to reflect light incident around the side of the light source. According to claim 4,
The lateral reflection layer is provided to surround the circumference of the light source. According to claim 4,
The display device of claim 1 , wherein the lateral reflection layer includes an internal reflector provided inside the light conversion layer to reflect light emitted from the light source and transmit the reflected light through the light conversion layer. According to claim 6,
The display device of claim 1 , wherein the lateral reflection layer includes an external reflector provided outside the light conversion layer to reflect light transmitted through the light conversion layer. According to claim 7,
The display device of claim 1 , wherein the outer reflector integrally extends from the inner reflector. According to claim 4,
The lateral reflection layer is provided below the light conversion layer and contacts the light conversion layer. According to claim 9,
The light source includes a light emitting surface forming an upper surface and a side surface extending downward from the light emitting surface,
The light conversion layer includes an upper surface portion of the light conversion layer corresponding to the light emitting surface of the light source and a side portion of the light conversion layer corresponding to the side surface of the light source,
The upper surface of the light conversion layer covers the light emitting surface of the light source,
The light conversion layer side portion and the side reflection layer cover the side surface of the light source. According to claim 1,
The display device of claim 1 , wherein the light source unit includes a back reflection layer provided to reflect light incident to a rear side of the light source. According to claim 1,
The light source unit further includes a multi-refracting reflective layer provided on an outer surface of the second protection unit,
The multi-refractive reflective layer includes a first reflective layer having a first refractive index and a second reflective layer provided on an outer surface of the first reflective layer and having a second refractive index. According to claim 1,
The outer surface of the second protector includes a first reflective surface provided on the upper portion of the second protector and a second reflective surface provided on a side of the second protector extending downward from the first reflective surface,
The display device of claim 1 , wherein the first reflective surface and the second reflective surface meet to form an edge of the second protection unit, and the first reflective surface includes a first inclined surface that is downwardly inclined toward a center of the light source. According to claim 13,
The second reflective surface includes a second inclined surface that is downwardly inclined toward the outer side of the light source. According to claim 1,
An outer surface of the second protection unit, from which light passing through the second protection unit is emitted, is in contact with external air. display panel; and
A light source unit disposed behind the display panel to provide light to the display panel; includes,
The light source unit
substrate; and
It includes a light source package disposed in front of the substrate,
The light source package,
a light source mounted on the substrate and emitting light;
a first protection unit covering the light source;
a light conversion layer disposed to be spaced apart from the light source by the first protection unit and provided to change a wavelength of light irradiated from the light source;
A second protection unit covering the light conversion layer; and
a side reflection layer provided on a side of the light source to reflect part of the light incident from the light source to the light conversion layer and re-reflect part of the light passing through the light conversion layer;
A display device comprising a. According to claim 16,
The side reflection layer includes an inner reflector provided inside the light conversion layer to reflect part of the light incident from the light source to the light conversion layer and to re-reflect part of the light passing through the light conversion layer. A display device comprising an outer reflector provided outside a layer. According to claim 16,
The light source package further includes a back reflection layer provided under the light source to reflect light incident to the rear of the light source. According to claim 16,
The second protection unit forms an outer surface of the light source package,
The second protection unit includes a first reflective surface provided on an upper portion and a second reflective surface provided on a side portion extending downward from the first reflective surface,
The display device of claim 1 , wherein the first reflective surface and the second reflective surface meet to form an edge of the second protection unit, and the first reflective surface includes a first inclined surface that is downwardly inclined toward a center of the light source. According to claim 19,
The second reflective surface includes a second inclined surface inclined downward toward the outer side of the light source.

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