WO2022131840A1 - 유닛 픽셀 및 그것을 포함하는 디스플레이 장치 - Google Patents
유닛 픽셀 및 그것을 포함하는 디스플레이 장치 Download PDFInfo
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- WO2022131840A1 WO2022131840A1 PCT/KR2021/019256 KR2021019256W WO2022131840A1 WO 2022131840 A1 WO2022131840 A1 WO 2022131840A1 KR 2021019256 W KR2021019256 W KR 2021019256W WO 2022131840 A1 WO2022131840 A1 WO 2022131840A1
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- light
- light emitting
- transparent substrate
- emitting devices
- light scattering
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/20—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a particular shape, e.g. curved or truncated substrate
- H01L33/22—Roughened surfaces, e.g. at the interface between epitaxial layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
- H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
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- H—ELECTRICITY
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- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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Definitions
- the present disclosure relates to a unit pixel and a display device having the same, and more particularly, to a unit pixel including a light emitting element and a display device having the same.
- Light emitting devices are semiconductor devices using light emitting diodes, which are inorganic light sources, and are used in various fields such as display devices, vehicle lamps, and general lighting. Because of its advantages, it is rapidly replacing existing light sources.
- a conventional light emitting diode has been mainly used as a backlight light source in a display device.
- a display device that directly implements an image using a light emitting diode has been developed.
- Such a display device is also referred to as a micro LED display.
- Such a display device generally implements various colors using a mixture of blue, green, and red, and includes a plurality of pixels to implement various images. Each pixel has blue, green and red sub-pixels. A color of a specific pixel is determined through the color of these sub-pixels, and an image may be implemented by a combination of these pixels.
- micro LEDs are arranged on a plane corresponding to each sub-pixel, and a large number of micro LEDs are mounted on one substrate.
- micro LEDs are very small, less than 200 ⁇ m and less than 100 ⁇ m, and there are certain limitations due to such a small size. For example, it is difficult to directly mount the light emitting diodes on the display panel because micro LEDs having a small size are handled.
- the beams emitted from the sub-pixels have different directional angles, light mixing may not be uniform, and thus colors may be different depending on a user's viewing angle.
- An object of the present disclosure is to provide a unit pixel capable of mitigating a color difference according to an orientation angle by controlling a light pattern of light emitting elements, and a display device having the same.
- the micro LED light pattern according to the beam angle does not deteriorate even if the size thereof is reduced. Accordingly, in order to implement a display device using a smaller-sized micro LED, the above exemplary embodiments provide a technique for improving a light pattern according to the directional angle of the micro LED.
- a unit pixel includes: a transparent substrate; and a plurality of light emitting devices arranged on the transparent substrate, wherein the transparent substrate includes at least one light scattering line disposed therein to correspond to each of the plurality of light emitting devices.
- the at least one light scattering line may be continuous or may include voids spaced apart from each other.
- the light scattering line may extend from one side of the transparent substrate to the other side opposite to it.
- the at least one light scattering line may include a plurality of light scattering lines orthogonal to each other.
- the plurality of light scattering lines may be disposed to surround an upper region of the light emitting devices.
- the plurality of light scattering lines may partially overlap at least one of the light emitting devices.
- the plurality of light scattering lines may include a line crossing an upper region of the light emitting devices and lines crossing an upper region of each of the light emitting devices.
- a light blocking layer disposed between the transparent substrate and the light emitting devices may be further included.
- the light blocking layer may have at least one window configured to pass the light generated by the light emitting devices, and the at least one light scattering line may be disposed to correspond to the window.
- the light blocking layer may have a plurality of windows respectively corresponding to the light emitting devices, and the at least one light scattering line may include a plurality of light scattering lines disposed to surround the plurality of windows.
- the at least one light scattering line may cross an upper region of the at least one window.
- the at least one light scattering line may have an average height of 10 ⁇ m or less.
- sub-pixels constituting a unit pixel are provided.
- the sub-pixel may include a transparent substrate; and a light emitting device disposed on the transparent substrate, wherein the transparent substrate includes at least one light scattering line.
- the at least one light scattering line may include continuous voids or voids spaced apart from each other.
- the light scattering line may extend from one side of the transparent substrate to the other side opposite to it.
- a display apparatus includes a circuit board; and a plurality of unit pixels disposed on the circuit board.
- Each of the plurality of unit pixels may include a plurality of light emitting devices; and a transparent substrate covering the plurality of light emitting devices, wherein the transparent substrate includes at least one light scattering line disposed therein to correspond to each of the plurality of light emitting devices.
- the at least one light scattering line may include continuous voids or voids spaced apart from each other.
- the light scattering line may extend from one side of the transparent substrate to the other side opposite to it.
- the unit pixel may further include a light blocking layer disposed between the transparent substrate and the light emitting devices, and the light blocking layer may have at least one window configured to pass the light generated by the light emitting devices. and the at least one light scattering line may be disposed to correspond to the window.
- the transparent substrate may include a plurality of regions spaced apart from each other and respectively disposed on the light emitting devices, and the light scattering line may be disposed in each region of the transparent substrate.
- the circuit board may have pads, and each of the unit pixels may be bonded to the pads through a bonding material.
- a unit pixel includes a transparent substrate including a light incident surface and a light output surface; a plurality of light emitting devices arranged on the transparent substrate and emitting light of different colors; and at least one light scattering line disposed in a predetermined pattern corresponding to one or more of the plurality of light emitting elements in the transparent substrate, wherein light generated from the plurality of light emitting elements is transmitted to a light incident surface of the transparent substrate It is incident on the transparent substrate through the light exit surface and exits from the transparent substrate through the light exit surface.
- the at least one light scattering line may include continuous voids or voids spaced apart from each other.
- the at least one light scattering line may extend from one side of the transparent substrate to the other side opposite to it.
- the at least one light scattering line may include a plurality of light scattering lines positioned to be orthogonal to each other.
- the plurality of light scattering lines may be disposed to surround the light emitting devices.
- the unit pixel may further include a plurality of windows corresponding to the plurality of light emitting devices and exposing at least one of the plurality of light emitting devices, wherein the plurality of light scattering lines are formed on at least one of the plurality of windows. It may overlap at least one of the light emitting elements by extending across the window.
- the plurality of light scattering lines may include a first line crossing all the light emitting devices and a plurality of second lines crossing each of the light emitting devices.
- the unit pixel may further include a light blocking layer disposed between the plurality of light emitting devices disposed on the same surface as the transparent substrate, wherein the light blocking layer allows light generated by the light emitting devices to pass therethrough. It may have at least one window configured, and the at least one light scattering line may be disposed to correspond to the window.
- the light blocking layer may have a plurality of windows respectively corresponding to the light emitting devices, and the at least one light scattering line may include a plurality of light scattering lines disposed around or across the plurality of windows. may include
- the at least one light scattering line may cross the top of the at least one window.
- the at least one light scattering line may have an average height of 10 ⁇ m or less.
- a unit pixel includes a plurality of sub-pixels including a first sub-pixel and a second sub-pixel, wherein the first sub-pixel includes: a first transparent substrate; and a first light emitting device disposed on the first transparent substrate and emitting light of a selected color, wherein the second sub-pixel includes: a second transparent substrate; and a second light emitting device disposed on the second transparent substrate and emitting light of a color different from that of the first light emitting device, wherein at least one light scattering line comprises a first transparent substrate, a second transparent substrate, or a second light emitting device.
- the first transparent substrate and the second transparent substrate may form a common transparent substrate including a light incident surface and a light output surface, and the at least one light scattering line is the common transparent substrate. continuous voids arranged in a substrate or voids spaced apart from each other, wherein the light scattering line extends from one side of the transparent substrate to the other side opposite it.
- the first transparent substrate is arranged on the first light emitting element
- the second transparent substrate is arranged on the second light emitting element
- the at least one light scattering line is arranged on the first transparent substrate and the second transparent substrate and voids arranged therein and spaced apart from each other, wherein the first transparent substrate, the second transparent substrate, or both the first and second transparent substrates include the first light emitting element, the second light emitting element, or the first and and a growth substrate for growing all of the second light emitting devices.
- a display apparatus includes a circuit board; and a plurality of unit pixels disposed on the circuit board, wherein each of the plurality of unit pixels includes: a plurality of light emitting devices emitting light of different colors; a transparent substrate covering the plurality of light emitting devices and including a light incident surface and a light output surface; and at least one light scattering line disposed in a predetermined pattern in the transparent substrate to correspond to one or more of the plurality of light emitting devices, wherein the light generated from the plurality of light emitting devices passes through the light incident surface It is incident on the transparent substrate and exits from the transparent substrate through the light emitting surface.
- the at least one light scattering line may include continuous voids or voids spaced apart from each other.
- the at least one light scattering line may extend from one side of the transparent substrate to the other side opposite to it.
- the plurality of light emitting devices may be spaced apart from each other and arranged on the transparent substrate, and each unit pixel may further include a light blocking layer disposed between the transparent substrate and each of the light emitting devices, wherein the light blocking layer includes the light emitting device. It may have at least one window configured to pass the light generated by the elements to the light incident surface of the transparent substrate, and the at least one light scattering line may be disposed to correspond to the window.
- the transparent substrate may include a plurality of discontinuous regions spaced apart from each other and separated from each other, the plurality of discontinuous regions corresponding to the light emitting devices, respectively disposed on the corresponding light emitting devices, and the at least one The light scattering line may be disposed in each region of the transparent substrate.
- the circuit board may include a plurality of pads, and each of the unit pixels may be bonded to the plurality of pads through a bonding material.
- FIG. 1 is a schematic plan view for explaining a display device according to an embodiment of the present disclosure.
- FIG. 2A is a schematic plan view for explaining a light emitting device according to an embodiment of the present disclosure.
- Fig. 2B is a schematic cross-sectional view taken along the line A-A' of Fig. 2A;
- 3A is a schematic plan view illustrating a unit pixel according to an embodiment of the present disclosure.
- 3B is a schematic rear view illustrating light scattering lines of a unit pixel according to an embodiment of the present disclosure.
- Fig. 3C is a schematic cross-sectional view taken along the line B-B' of Fig. 3A;
- FIG. 4 is a schematic cross-sectional view for explaining a display device according to an embodiment of the present disclosure.
- FIG. 5 is a schematic rear view for explaining light scattering lines of a unit pixel according to another embodiment of the present disclosure.
- FIG. 6 is a schematic cross-sectional view illustrating a unit pixel according to another embodiment of the present disclosure.
- FIG. 7 is a schematic cross-sectional view illustrating a unit pixel according to another embodiment of the present disclosure.
- FIG. 8 is a schematic diagram for explaining a method of manufacturing a unit pixel according to an embodiment of the present disclosure.
- FIG. 9 is a schematic cross-sectional view for explaining a display device according to another embodiment of the present disclosure.
- FIG. 10A and 10B are graphs showing light directing patterns of light emitting devices in a unit pixel according to the prior art.
- FIG. 10A illustrates a graph scanned in the x direction as shown in FIG. 3B
- FIG. 10B is FIG. 3B
- FIG. 11A and 11B are graphs showing light directing patterns of light emitting devices in a unit pixel according to an embodiment of the present disclosure, and FIG. 11A illustrates a graph scanned in the x direction as shown in FIG. 3B , FIG. 11b illustrates a graph scanned in the y direction as shown in FIG. 3B .
- FIG. 12A and 12B are graphs showing light directing patterns of light emitting devices in a unit pixel according to another embodiment of the present disclosure, and FIG. 12A illustrates a graph scanned in the x direction as shown in FIG. 3B; 12B illustrates a graph scanned in the y direction as shown in FIG. 3B .
- FIG. 13A to 13F are schematic plan views illustrating light scattering lines or patterns according to various embodiments of the present disclosure
- FIG. 13A is a light scattering line arranged in a rectangular shape to define the same area as the light emitting devices.
- 13B illustrates light scattering lines arranged in a rectangular shape to define an area smaller than the foot and the elements
- FIG. 13C illustrates light scattering lines arranged to cross each of the light emitting elements in a vertical direction
- 13D illustrates light scattering lines arranged to cross each light emitting element in a diagonal direction
- FIG. 13E illustrates light scattering lines arranged to define a larger area than the light emitting elements
- FIG. 13F is a rectangle It is exemplified that light scattering lines arranged in a shape and light scattering lines crossing the light emitting devices in a diagonal direction overlap each other.
- FIG. 1 is a plan view illustrating a display apparatus 10000 according to an embodiment of the present disclosure.
- a display apparatus 10000 may include a panel substrate 1000 and a plurality of unit pixels 100 .
- the display device 10000 is not particularly limited, but may include a VR display device such as a micro LED TV, a smart watch, a VR headset, or an AR display device such as augmented reality glasses.
- a VR display device such as a micro LED TV, a smart watch, a VR headset, or an AR display device such as augmented reality glasses.
- the panel substrate 1000 may be formed of a material such as polyimide (PI), FR-4 glass epoxy (FR4), glass, or the like, and may include a circuit for passive matrix driving or active matrix driving.
- the panel substrate 1000 may include wirings and resistors therein, and in another embodiment, the panel substrate 1000 may include wirings, transistors, and capacitors.
- the panel substrate 1000 may have pads electrically connected to an internal circuit on its upper surface.
- the plurality of unit pixels 100 may be arranged on the panel substrate 1000 .
- Each unit pixel 100 includes a plurality of light emitting elements 10a, 10b, and 10c.
- the light emitting elements 10a, 10b, and 10c may emit light of different colors.
- the light emitting elements 10a, 10b, and 10c in each unit pixel 100 may be arranged in a predetermined pattern as shown in FIG. 1 .
- the light emitting elements 10a, 10b, and 10c may be arranged in a vertical direction with respect to a display screen on which an image is implemented.
- the present disclosure is not limited thereto, and the light emitting elements 10a, 10b, and 10c may be arranged in a horizontal direction with respect to a display screen on which an image is implemented.
- each component of the display device 10000 will be described in detail in the order of the light emitting devices 10a , 10b , 10c and the unit pixel 100 disposed in the display device 10000 .
- FIGS. 2A and 2B are a plan view and a cross-sectional view for explaining a light emitting device 10a according to an embodiment of the present disclosure.
- the light emitting device 10a includes a light emitting structure including a first conductivity type semiconductor layer 21 , an active layer 23 , and a second conductivity type semiconductor layer 25 .
- the light emitting device 10 includes an ohmic contact layer 27 , an insulating layer 29 , a first contact pad 31 , a second contact pad 33 , a first electrode pad 41 , and a second electrode pad. (43) may be included.
- the first conductivity type semiconductor layer 21 , the active layer 23 , and the second conductivity type semiconductor layer 25 may be grown on a growth substrate (not shown).
- the growth substrate may be a variety of substrates that can be used for semiconductor growth, such as a gallium nitride substrate, a GaAs substrate, a Si substrate, a sapphire substrate, in particular a patterned sapphire substrate.
- the growth substrate may be separated from the semiconductor layers by using a technique such as mechanical polishing, laser lift-off, or chemical lift-off.
- the present disclosure is not limited thereto, and a portion of the substrate may remain to constitute at least a portion of the first conductivity-type semiconductor layer 21 .
- the plurality of light emitting devices 10a, 10b, and 10c may emit red light, green light, and blue light, respectively.
- the red light emitting element 10a, the green light emitting element 10b, and the blue light emitting element 10c are illustrated as being arranged in the order, the present disclosure is not necessarily limited thereto.
- the semiconductor layers are aluminum gallium arsenide (AlGaAs), gallium arsenide phosphide (GaAsP), aluminum gallium indium phosphide (aluminum gallium indium phosphide, AlGaInP) and gallium phosphide (GaP).
- AlGaAs aluminum gallium arsenide
- GaAsP gallium arsenide phosphide
- AlGaInP aluminum gallium indium phosphide
- GaP gallium phosphide
- the semiconductor layers are indium gallium nitride (InGaN), gallium nitride (GaN), gallium phosphide (GaP), aluminum gallium indium phosphide (AlGaInP), or aluminum gallium phosphide (AlGaP).
- InGaN indium gallium nitride
- GaN gallium nitride
- GaP gallium phosphide
- AlGaInP aluminum gallium indium phosphide
- AlGaP aluminum gallium phosphide
- the semiconductor layers may include gallium nitride (GaN), indium gallium nitride (InGaN), or zinc selenide (ZnSe).
- GaN gallium nitride
- InGaN indium gallium nitride
- ZnSe zinc selenide
- the first conductivity type semiconductor layer 21 , the active layer 23 , and the second conductivity type semiconductor layer 25 may be grown on a substrate in a chamber using a method such as metal organic chemical vapor deposition (MOCVD).
- MOCVD metal organic chemical vapor deposition
- the first conductivity type semiconductor layer 21 contains n-type impurities such as Si, Ge, and Sn
- the second conductivity type semiconductor layer 25 contains p-type impurities such as Mg, Sr, and Ba.
- the first conductivity type semiconductor layer 21 may include GaN or AlGaN containing Si as a dopant
- the second conductivity type semiconductor layer 25 may include GaN or AlGaN containing Mg as a dopant. can do.
- the first conductivity-type semiconductor layer 21 and the second conductivity-type semiconductor layer 25 are each illustrated as a single layer, these layers may be multi-layered, and also superlattice It may include layers.
- the active layer 23 may include a single quantum well structure or a multiple quantum well structure, and the composition ratio of the nitride-based semiconductor may be adjusted to emit a desired wavelength.
- the active layer 23 may emit red light, green light, blue light, or ultraviolet light according to a semiconductor material constituting the layer and a composition ratio thereof.
- the second conductivity type semiconductor layer 25 and the active layer 23 may have a mesa (M) structure and be disposed on the first conductivity type semiconductor layer 21 .
- the mesa M may include the active layer 23 and the second conductivity type semiconductor layer 25 .
- at least a portion of the first conductivity type semiconductor layer 21 may be included.
- the mesa M is positioned on a partial region of the first conductivity type semiconductor layer 21 , and a top surface of the first conductivity type semiconductor layer 21 may be exposed around the mesa M.
- the light emitting device 10 may be formed by separating the growth substrate, so that the first conductivity type semiconductor layer 21 may be exposed on the lower surface of the light emitting device 10 .
- the first conductivity type semiconductor layer 21 may have a concave-convex pattern by surface texturing as shown in FIG. 2B , but the present disclosure is not limited thereto, and may have a flat surface.
- the uneven pattern may be formed by surface texturing using a dry or wet etching process.
- the ohmic contact layer 27 may be in ohmic contact with the second conductivity type semiconductor layer 25 and be disposed on the second conductivity type semiconductor layer 25 .
- the ohmic contact layer 27 may be formed as a single layer or multiple layers.
- the ohmic contact layer 27 may be formed of a transparent conductive oxide film or a metal film.
- the transparent conductive oxide layer may include ITO or ZnO
- the metal layer may include metals such as Al, Ti, Cr, Ni and Au, and alloys thereof.
- the first contact pad 31 may be disposed on the exposed first conductivity-type semiconductor layer 21 in which the mesa M is not formed.
- the first contact pad 31 may be in ohmic contact with the first conductivity-type semiconductor layer 21 .
- the first contact pad 31 may be formed of an ohmic metal layer in ohmic contact with the first conductivity-type semiconductor layer 21 .
- the ohmic metal layer of the first contact pad 31 may be appropriately selected according to a semiconductor material of the first conductivity type semiconductor layer 21 .
- the second contact pad 33 may be disposed on the ohmic contact layer 27 .
- the second contact pad 33 may be electrically connected to the ohmic contact layer 27 .
- the insulating layer 29 may include at least one of the first conductivity type semiconductor layer 21 , the active layer 23 , the second conductivity type semiconductor layer 25 , the first contact pad 31 , and the second contact pad 33 . Some of it can be covered. In the exemplary embodiment of the present disclosure, the insulating layer 29 may be formed to cover substantially the entire surface of the second contact pad 33 , excluding a portion of the first contact pad 31 and a partial region of the second contact pad 33 . That is, the insulating layer 29 may have a first opening 29a and a second opening 29b exposing the first contact pad 31 and the second contact pad 33 .
- the insulating layer 29 may be formed of a distributed Bragg reflector in which insulating layers having different refractive indices are stacked, and the distributed Bragg reflector is SiO 2 , TiO 2 , Nb 2 O 5 , Si 3 N 4 , SiON, Ta 2 At least two types of insulating layers selected from O 5 and the like may be formed by alternately stacking each other.
- the distributed Bragg reflector may reflect light emitted from the active layer 23 , wherein the distributed Bragg reflector exhibits high reflectivity over a relatively wide wavelength range including a peak wavelength of light emitted from the active layer 23 . can form. In addition, if necessary, it may be designed in consideration of the incident angle of the light. Through this, the distributed Bragg reflector may reflect the light generated in the active layer 23 and emit it through the exposed first conductivity-type semiconductor layer 21 after the growth substrate is removed.
- the light emitting device 10c emitting blue light may have higher internal quantum efficiency than the light emitting devices 10a and 10b emitting red light and green light. Accordingly, the light emitting device 10c emitting blue light may exhibit higher light extraction efficiency than the light emitting devices 10a and 10b emitting red light and green light. Accordingly, it may be difficult to properly maintain a color mixing ratio of red light, green light, and blue light.
- the light emitting elements 10a, 10b, and 10c may be formed such that applied distributed Bragg reflectors have different reflectivities.
- the light emitting device 10c emitting blue light may have a distributed Bragg reflector having a relatively low reflectance compared to the light emitting devices 10a and 10b emitting red light and green light.
- distributed Bragg reflectors applied to the light emitting devices 10a, 10b, and 10c of the red light, green light, and blue light may have substantially similar thicknesses.
- process conditions applied to each of the light emitting devices 10a, 10b, and 10c emitting red light, green light, and blue light may be similarly set.
- the process of patterning the insulating layer 29 may be set similarly, and the distributed Bragg reflectors may have a similar number of stacks.
- the present disclosure is not limited thereto.
- the first electrode pad 41 and the second electrode pad 43 may be disposed on the insulating layer 29 .
- the first electrode pad 41 may extend from an upper portion of the first contact pad 31 to an upper portion of the ohmic contact layer 27 with the insulating layer 29 interposed therebetween.
- the second electrode pad 43 may be disposed in an upper region of the ohmic contact layer 27 .
- the second electrode pad 43 may extend from an upper portion of the second contact pad 33 to an upper portion of the ohmic contact layer 27 with the insulating layer 29 interposed therebetween.
- the first electrode pad 41 may be electrically connected to the first contact pad 31 through the first opening 29a of the insulating layer 29 , and may be directly connected to the first conductive type if necessary.
- the semiconductor layer 21 may be in contact.
- the first contact pad 31 may be omitted.
- the second electrode pad 43 may be electrically connected to the second contact pad 33 through the second opening 29b of the insulating layer 29 , and the second electrode pad 43 may be directly The ohmic contact layer 27 may be contacted, and the second contact pad 33 may be omitted.
- the light-emitting elements 10a, 10b, and 10c further include a layer having an additional function in addition to the described layer. can do.
- various layers such as a reflective layer that reflects light, an additional insulating layer for insulating a specific component, and a solder prevention layer for preventing diffusion of solder may be included in the light emitting devices 10a, 10b, and 10c.
- FIG. 3A is a schematic plan view illustrating a unit pixel according to an embodiment of the present disclosure
- FIG. 3B is a schematic rear view illustrating a unit pixel according to an embodiment of the present disclosure
- FIG. 3C is It is a schematic cross-sectional view taken along the cut-off line B-B' of FIG. 3A.
- the unit pixel 100 may include a transparent substrate 121 , light emitting devices 10a , 10b , and 10c , and a light blocking layer 123 .
- the unit pixel 100 may also include an adhesive layer 125, a step control layer 127, connection layers 129a, 129b, 129c, 129d, and an insulating material layer 131, and further, a surface layer ( 122) may be further included.
- the unit pixel 100 may include at least three light emitting devices 10a, 10b, and 10c.
- the plurality of light emitting devices 10a, 10b, and 10c may emit light of different colors.
- the plurality of light emitting devices 10a, 10b, and 10c may emit red light, green light, and blue light, respectively.
- the peak wavelength of the red light may be 600 nm to 670 nm.
- a peak wavelength of the green light may be 500 nm to 590 nm.
- the peak wavelength of the blue light may be 430 nm to 490 nm.
- the light emitting elements 10a, 10b, and 10c are the same as those described with reference to FIGS. 2A and 2B, and thus detailed descriptions thereof will be omitted.
- the light emitting elements 10a, 10b, and 10c are disposed on the transparent substrate 121 .
- the transparent substrate 121 may be a light-transmitting substrate such as PET, a glass substrate, a quartz substrate, or a sapphire substrate.
- the transparent substrate 121 may be disposed on the light emitting surface of the display device 10000 , and the light generated from the light emitting devices 10a , 10b , and 10c may be emitted to the outside through the transparent substrate 121 .
- the transparent substrate 121 may have a light emitting surface and a light incident surface adjacent to the light emitting devices 10a, 10b, and 10c.
- the light incident surface of the transparent substrate 121 facing the light emitting devices 10a, 10b, and 10c may be a flat surface, but is not limited thereto.
- a concave-convex pattern 121p may be formed on a light incident surface facing the elements 10a, 10b, and 10c.
- the transparent substrate 121 may include an anti-reflection coating on the light emitting surface, or may include an anti-glare layer.
- the transparent substrate 121 may have a thickness of, for example, 30 ⁇ m to 300 ⁇ m.
- the thickness of the transparent substrate is an example, and the present disclosure is not limited thereto.
- the transparent substrate 121 does not include a circuit.
- the present disclosure is not limited thereto, and the transparent substrate 121 may include a circuit.
- the transparent substrate 121 may include light scattering lines 121s therein.
- the light scattering lines 121s are described and illustrated in FIG. 3B . Additionally, or alternatively, the present disclosure includes light scattering pattern(s), light scattering line pattern(s), light scattering form(s), light scattering arrangement(s), light scattering configuration(s), etc. .
- the light scattering lines 121s may include voids as shown in FIG. 3C .
- the voids may be continuous or spaced apart from each other to form a light scattering line.
- the light scattering lines 121s may be orthogonal to each other, and may surround the light emitting elements 10a, 10b, and 10c so as not to overlap the light emitting elements 10a, 10b, and 10c.
- the light scattering lines 121s may be disposed to correspond to each of the light emitting devices 10a, 10b, and 10c, and may adjust a light directing pattern of the light emitting devices 10a, 10b, and 10c.
- the light scattering lines 121s of the same shape may be disposed around each of the light emitting devices 10a, 10b, and 10c, but the present disclosure is not limited thereto, and the light emitting devices 10a , 10b, and 10c), different types of light scattering lines 121s may be disposed.
- the light scattering lines 121s are for explanation as illustrated in FIG. 3B , and include various light scattering patterns. In FIG. 3B , it is illustrated as a dotted line and is illustrated in a straight line, but the present disclosure is not limited thereto.
- the light scattering lines may have a non-linear shape or may be viewed as a three-dimensional shape or pattern.
- each light scattering line 121s may extend from one side of the transparent substrate 121 to the other side opposite to it.
- the present disclosure is not limited thereto, and the light scattering lines 121s may have a length smaller than the width of the transparent substrate 121 and may be disposed in a partial region of the transparent substrate 121 .
- each light scattering line 121s is illustrated as a straight line in the present embodiment, the present invention is not limited thereto, and may be a curved line.
- the modified region formed by the scribing line 121L may remain on the side surface of the transparent substrate 121 .
- the scribing line 121L may be formed using a stealth laser, and the scribing line 121L may be disposed closer to the light emitting devices 10a, 10b, and 10c than the light scattering line 121s. .
- the present disclosure is not limited thereto, and the scribing line 121L may be farther away from the light emitting devices 10a, 10b, and 10c than the light scattering line 121s.
- one unit pixel 100 is illustrated and described as being formed on one transparent substrate 121 , but the present disclosure is not limited thereto.
- a plurality of unit pixels 100 may be formed.
- the surface layer 122 may be disposed between the transparent substrate 121 and the light blocking layer 123 .
- the surface layer 122 may be formed to improve adhesion between the light blocking layer 123 and the transparent substrate 121 .
- the surface layer 122 may be formed of, for example, a silicon oxide film (SiO 2 ).
- the surface layer 122 may be omitted depending on the type of the transparent substrate 121 and the light blocking layer 123 .
- the light blocking layer 123 is disposed between the transparent substrate 121 and the light emitting devices 10a, 10b, and 10c.
- the light blocking layer 123 may include an inorganic material or an organic material, and may be formed in a black color by adding a dye such as carbon, for example, including a material absorbing light such as a black matrix. can do.
- the light absorbing material may prevent the light generated by the plurality of light emitting elements 10a, 10b, and 10c from being emitted to an undesired region, thereby improving the contrast of the display apparatus 10000 .
- the light blocking layer 123 may have a plurality of windows 123a on a light propagation path so that the light generated by the light emitting devices 10a, 10b, and 10c is incident on the transparent substrate 121 .
- the windows 123a may be defined as regions in which a portion of the light blocking layer 123 is opened.
- the windows 123a may at least partially overlap the light emitting devices 10a, 10b, and 10c in a vertical direction.
- the width of the window 123a may be wider than the width of the corresponding light emitting devices 10a, 10b, and 10c, but the present disclosure is not limited thereto.
- the width of the windows 123a may be smaller than or equal to the width of the corresponding light emitting devices 10a, 10b, and 10c.
- the windows 123a When the windows 123a vertically overlap the light emitting devices 10a, 10b, and 10c, the windows 123a define the positions of the light emitting devices 10a, 10b, and 10c as shown in FIG. 3B . can do.
- a plurality of windows 123a may be formed to correspond to the light emitting devices 10a, 10b, and 10c. Since the positions of the light emitting elements 10a, 10b, and 10c are defined by the windows 123a, separate alignment markers for aligning the light emitting elements 10a, 10b, and 10c may be omitted. However, the present disclosure is not limited thereto, and an alignment marker may be provided to align the light emitting devices 10a , 10b , and 10c on the transparent substrate 121 .
- the alignment marker may be formed of, for example, the transparent substrate 121 , the light blocking layer 123 , or the adhesive layer 125 , or a separate layer for generating the alignment marker is the transparent substrate 121 , the light blocking layer It may be formed on the layer 123 or the adhesive layer 125 .
- the plurality of windows 123a are formed to correspond to the light emitting elements 10a, 10b, and 10c, but the present disclosure is not limited thereto.
- a single window 123a may be provided on the light blocking layer 123 , and a plurality of light emitting devices 10a , 10b , and 10c may be disposed to vertically overlap the single window 123a . have.
- the light blocking layer 123 may have a thickness of, for example, about 0.5um to about 2um, and further may have a thickness of about 0.5um to about 1.5um, and further, about 0.5um to about 0.5um. It may have a thickness of 1 ⁇ m. When the thickness of the light-blocking layer 123 is as thin as 0.5um or less, it is difficult to achieve the purpose of blocking light. This may lead to an increase in production costs.
- the light scattering lines 121s may be disposed to correspond to the windows 123a.
- the light scattering lines 121s may pass around the windows 123a, and each window 123a may be surrounded by a plurality of light scattering lines 121s.
- the adhesive layer 125 may be used to attach the light emitting devices 10a , 10b , and 10c to the transparent substrate 121 .
- the adhesive layer 125 is disposed on the transparent substrate 121 and may cover at least a portion of the light blocking layer 123 .
- the adhesive layer 125 may be formed on the entire surface of the transparent substrate 121 , but is not limited thereto, and may be formed in a partial region to expose a region near the edge of the transparent substrate 121 .
- the adhesive layer 125 may fill the windows 123a formed by the light blocking layer 123 .
- the adhesive layer 125 may be formed of a light-transmitting material, and may transmit light emitted from the light-emitting devices 10a, 10b, and 10c.
- the adhesive layer 125 may be formed using an organic adhesive, for example, the adhesive layer 125 may be formed using a transparent epoxy, PDMS, or the like.
- the adhesive layer 125 may include a diffusion material such as SiO 2 , TiO 2 , or ZnO.
- the light emitting devices 10a, 10b, and 10c may be prevented from being observed through the transparent substrate 110 .
- the light emitting elements 10a, 10b, and 10c are attached to the transparent substrate 121 by the adhesive layer 125, but the present invention is not limited thereto, and other bonding members are used instead of the adhesive layer 125.
- the light emitting devices 10a, 10b, and 10c may be coupled to the transparent substrate 121 .
- the light emitting devices 10a, 10b, and 10c may be coupled to the transparent substrate 121 using a spacer.
- the spacer may be coated with an organic resin and may have a predetermined shape, typically a pillar or columnar shape. Accordingly, a gas or liquid may be filled in a region between the light emitting devices 10a , 10b , and 10c and the transparent substrate 121 .
- An optical layer that transmits the light emitted from the light emitting devices 10a, 10b, and 10c may be formed by these gases or liquids.
- the step control layer 127 may cover at least a portion of the light emitting devices 10a, 10b, and 10c as shown in FIG. 3C .
- the step control layer 127 has first and second openings 127a and 127b exposing the first and second electrode pads 41 and 43 of the light emitting devices 10a, 10b, and 10c.
- the step control layer 127 controls the height of the surface on which the connection layers 129a, 129b, 129c, and 129d are formed so that the connection layers 129a, 129b, 129c, and 129d can be safely formed.
- the step control layer 127 may be formed of, for example, photosensitive polyimide.
- the first, second, third, and fourth connection layers 129a, 129b, 129c, and 129d are electrically connected to the plurality of light emitting devices 10a, 10b, and 10c as shown in FIG. 3A .
- the first, second, and third connection layers 129a, 129b, and 129c may be electrically connected to the second conductivity-type semiconductor layers 25 of the light emitting devices 10a, 10b, and 10c, respectively.
- the fourth connection layer 129d may be electrically connected to the first conductivity type semiconductor layer 21 of the plurality of light emitting devices 10a, 10b, and 10c in common.
- the first, second, and third connection layers 129a, 129b, and 129c are formed of the plurality of light emitting devices 10a, 10b, and 10c through the second opening 127b of the step control layer 127 . It may be connected to the second electrode pad 43 .
- the fourth connection layer 129d is formed through the first opening 127a of the step control layer 127 through the first electrode of the plurality of light emitting devices 10a, 10b, and 10c. It can be connected to the pad 41 .
- the first, second, third, and fourth connection layers 129a, 129b, 129c, and 129d may be formed together on the step control layer 127, and may include, for example, Au.
- the present embodiment describes that the first conductivity-type semiconductor layers 21 of the light emitting devices 10a, 10b, and 10c are electrically connected in common, the present disclosure is not limited thereto.
- the second conductivity-type semiconductor layers 25 of the light emitting devices 10a, 10b, and 10c may be electrically connected in common, and the first conductivity-type semiconductor layers 21 may be electrically spaced apart from each other.
- the insulating material layer 131 may at least partially cover the step difference control layer 127 .
- the insulating material layer 131 may be formed to have a thickness smaller than that of the step difference control layer 127 .
- the sum of the thicknesses of the insulating material layer 131 and the step difference control layer 127 may be, for example, about 1 ⁇ m to about 50 ⁇ m, but is not limited thereto.
- the insulating material layer 131 may cover a side surface of the step control layer 127 and at least a portion of the connection layers 129a, 129b, 129c, and 129d.
- the insulating material layer 131 has openings 131a, 131b, 131c, and 131d exposing the connection layers 129a, 129b, 129c, and 129d as shown in FIG. 3A .
- the openings 131a, 131b, 131c, and 131d may be partially formed on the connection layers 129a, 129b, 129c, and 129d, but are not limited thereto. As shown in FIG.
- the openings 131a , 131b , 131c , and 131d may have a shape open to the outside in regions adjacent to each corner of the transparent substrate 121 . That is, the insulating material layer 131 may be formed to expose the side surfaces of the step control layer 127 and the connection layers 129a , 129b , 129c and 129d near the corners of the transparent substrate 121 . As shown in FIG. 3A , the insulating material layer 131 partially covers two side surfaces of each of the connection layers 129a , 129b , 129c and 129d disposed near the edge of the transparent substrate 121 , and the remaining two All sides can be covered.
- the insulating material layer 131 may at least partially cover the exposed adhesive layer 125 .
- Pad regions of the unit pixel 100 may be defined by openings 131a, 131b, 131c, and 131d of the insulating material layer 131 exposing the connection layers 129a, 129b, 129c, and 129d. .
- the insulating material layer 131 may be a translucent material, may be formed of an organic or inorganic material, for example, may be formed of various materials such as epoxy, polyimide, SiO 2 , SiNx.
- the connection layers 129a, 129b, 129c, and 129d, except for pad regions have a lower surface, a side surface, and at least Some upper surfaces may all be surrounded by polyimide.
- the insulating material layer 131 may prevent a defect from occurring in the unit pixel 100 while the unit pixel 100 is being transferred.
- the unit pixel 100 may be mounted on a circuit board using a bonding material such as solder, and the bonding material is exposed to the openings 131a, 131b, 131c, and 131d of the insulating material layer 131 .
- the connection layers 129a, 129b, 129c, and 129d may be bonded to pads on the circuit board.
- FIG. 4 is a schematic cross-sectional view illustrating a display device on which the unit pixel 100 is mounted.
- unit pixels 100 are mounted on the panel substrate 1000 using the bonding material 150 .
- the panel substrate 1000 may be replaced with a circuit board.
- connection layers 129a, 129b, 129c, and 129d exposed through the openings 131a, 131b, 131c, and 131d of the insulating material layer 131 are connected to the panel substrate 1000 through the bonding material 150 .
- ) may be bonded to the pads 130 on the .
- the present disclosure is not limited thereto, and eutectic bonding, epoxy bonding, etc. may be used.
- the bonding material 150 may be, for example, solder, and after disposing a solder paste on the pad 130 using a technique such as screen printing, the unit pixel 100 and the circuit through a reflow process.
- the substrate can be bonded.
- the panel substrate 1000 may be formed of a material such as PI (Polyimide), FR4 (FR-4 glass epoxy), or glass, and may be passive matrix driven or active matrix driven. It may include a circuit for In an embodiment of the present disclosure, the panel substrate 1000 may include a wiring and a resistor therein, and in another embodiment, the panel substrate 1000 may include a wiring, a transistor, and capacitors. . In addition, the panel substrate 1000 may have pads electrically connected to the disposed circuits on its upper surface. The pads may be arranged to correspond to the connection layers 129a, 129b, 129c, and 129d in the unit pixels 100 to be mounted on the pad. In addition, a molding part may be formed on the panel substrate 1000 on which the plurality of unit pixels 100 are mounted to improve the contrast ratio.
- PI Polyimide
- FR4 FR-4 glass epoxy
- the panel substrate 1000 may have pads electrically connected to the disposed circuits on its upper surface. The pads may be arranged to correspond to the connection layers 129a,
- FIG. 5 is a schematic rear view for explaining a unit pixel according to another embodiment of the present disclosure.
- the unit pixel according to the present embodiment is substantially similar to the unit pixel 100 described with reference to FIGS. 3A, 3B, and 3C, but the light scattering lines 121s are formed by the light emitting devices 10a. , 10b, 10c) is different in that it is arranged to overlap.
- the light scattering lines 121s may include a light scattering line crossing the plurality of light emitting devices 10a, 10b, and 10c and light scattering lines crossing each of the light emitting devices 10a, 10b, and 10c. 5 , these light scattering lines 121s may be orthogonal to each other.
- two light scattering lines 121s are disposed to be orthogonal to each other on each of the light emitting devices 10a, 10b, and 10c, but the present disclosure is not limited thereto.
- a larger number of light scattering lines 121s may be disposed to overlap each of the light emitting devices 10a, 10b, and 10c.
- the two light scattering lines 121s on each of the light emitting devices 10a, 10b, and 10c may intersect rather than orthogonally.
- FIG. 6 is a schematic cross-sectional view illustrating a unit pixel according to another embodiment.
- the unit pixel according to the present embodiment is substantially similar to the unit pixel 100 described with reference to FIGS. 3A, 3B, and 3C , but the light scattering lines 121s are also perpendicular to each other. There is a difference in the arrangement to overlap. That is, the light scattering lines 121s including voids may overlap in the thickness direction of the transparent substrate 121 , thereby making the light directing pattern of the light emitting elements 10a, 10b, and 10c more uniform. have.
- the transparent substrate 121 may include modified regions formed on side surfaces of the transparent substrate 121 by scribing lines 121L formed using a stealth laser. In FIG.
- the modified region formed by the scribing line 121L is projected and illustrated in a cross-sectional view.
- the scribing line 121L may be disposed closer to the light emitting devices 10a, 10b, and 10c than the light scattering lines 121s, but the present disclosure is not limited thereto.
- FIG. 7 is a schematic cross-sectional view illustrating a unit pixel according to another exemplary embodiment.
- the unit pixel according to the present exemplary embodiment is substantially similar to the unit pixel described with reference to FIG. 6 , except that the light scattering lines 121s are double arranged.
- the transparent substrate 121 may include modified regions formed on side surfaces of the transparent substrate 121 by scribing lines 121L formed using a stealth laser.
- an example of the modified region formed by the scribing line 121L is projected along with a cross-sectional view.
- the scribing line 121L may be disposed farther apart from the light emitting devices 10a, 10b, and 10c than the light scattering lines 121s, but the present disclosure is not limited thereto.
- FIG. 8 is a schematic diagram for explaining a method of manufacturing a unit pixel according to an embodiment of the present disclosure.
- a unit pixel is manufactured by cutting a transparent substrate 121 having a plurality of pixel regions into individual pixel regions. Before cutting the transparent substrate 121, a light blocking layer 123 and an adhesive layer 125 as described with reference to FIGS. 3A, 3B, and 3C are formed in each pixel area, and the adhesive layer 125 is applied thereto.
- the light emitting devices 10a, 10b, and 10c are mounted on the transparent substrate 121 using 129d), and an insulating material layer 131 are formed.
- scribing lines 121L are formed inside the transparent substrate 121 using a stealth laser. Thereafter, the unit pixels are separated from each other by cracking the transparent substrate 121 along the scribing lines 121L. Regions formed by the scribing lines 121L may remain on the side of the transparent substrate 121 of the separated unit pixel.
- the light scattering lines 121s may be formed inside the transparent substrate 121 before cracking the transparent substrate 121 .
- the light scattering lines 121s may be formed using a stealth laser used to form the scribing line 121L.
- the light scattering lines 121s may be formed using, for example, a stealth laser having a wavelength of about 1000 to 1200 nm, and lower or deeper than the position where the scribing line 121L is formed in the transparent substrate 121 . can be formed (see FIG. 6 ). Meanwhile, end portions of the light scattering lines 121s may be observed together with the modified region remaining by the scribing line 121L.
- the scribing line 121L is formed on the side surface of the transparent substrate 121 cracked by the scribing line 121L (see FIG. 3C ).
- the scribing lines 121L and the light scattering lines 121s may be formed while moving the stage on which the transparent substrate 121 is placed, and thus may be formed in a linear shape. Since the voids formed in the light scattering lines 121s are formed while moving the stage, they may be formed in a direction inclined with respect to the vertical direction of the transparent substrate 121 and may have an elongated shape.
- the light scattering lines 121s may be formed of continuous or discontinuous voids, and the voids of the light scattering lines 121s generally have a vertical length smaller than the vertical length of the voids formed in the scribing line 121L. can have In addition, the moving speed of the stage when forming the light scattering lines 121s may be faster than the moving speed of the stage when forming the scribing lines 121L, so that the light scattering lines 121s The spacing between the voids of . may be greater than the spacing between the voids of the scribing lines 121L.
- the shape of the reformed region and the voids remaining in the light scattering lines 121s and the scribing lines 121L may be different due to different laser irradiation conditions as well as the speed of the stage.
- the light scattering lines 121s are formed in a linear shape, the present disclosure is not limited thereto, and the light scattering lines 121s may be formed in a curved shape.
- the light scattering lines 121s may be formed first, and then the scribing lines 121L may be formed. Alternatively, the scribing lines 121L may be formed first, and then the light scattering lines 121s may be formed. Alternatively, the scribing lines 121L and the light scattering lines 121s may be alternately formed.
- FIG. 9 is a schematic cross-sectional view for explaining a display device 20000 according to another embodiment of the present disclosure.
- the display device 10000 described above includes a unit pixel 100 on which a plurality of light emitting elements 10a, 10b, and 10c are mounted. ), and a plurality of sub-pixels are grouped to constitute a unit pixel.
- the circuit board 2000 is the same as the circuit board 1000 described with reference to FIG. 1 , and a detailed description thereof will be omitted.
- the sub-pixels include light-emitting elements 10a, 10b, and 10c and transparent substrates 221a, 221b, and 221c.
- the transparent substrates 221a, 221b, and 221c may be disposed on the light emitting devices 10a, 10b, and 10c, respectively.
- the transparent substrates 221a, 221b, and 221c may be growth substrates for growing the light emitting devices 10a, 10b, and 10c, respectively, but are not limited thereto.
- Light scattering lines 221s may be formed in the transparent substrates 221a, 221b, and 221c.
- the light scattering lines 221s may be formed in the transparent substrates 221a, 221b, and 221c in various shapes.
- FIG. 10A and 10B are graphs illustrating light directing patterns of light emitting devices in a unit pixel according to the related art.
- FIG. 10A is a scan in the x direction of FIG. 3B
- FIG. 10B is a scan in the y direction of FIG. 3B .
- the light directing patterns R, G, and B of the light emitting devices in both the x-direction and the y-direction are significantly different from each other. It is described in detail below with respect to FIG. 12B .
- 11A and 11B are graphs illustrating light directing patterns of light emitting devices in a unit pixel according to an embodiment of the present disclosure.
- the unit pixel according to the present embodiment is the same as the unit pixel according to the prior art, except that the light scattering lines 121s as described with reference to FIG. 3B are formed in the transparent substrate 121 .
- 11A is a scan in the x-direction of FIG. 3B
- FIG. 11B is a scan in the y-direction of FIG. 3B.
- FIG. 12A and 12B are graphs illustrating light directing patterns of light emitting devices in a unit pixel according to another exemplary embodiment of the present disclosure.
- the unit pixel according to the present embodiment is the same as the unit pixel according to the prior art, except that the light scattering lines 121s as described with reference to FIG. 5 are formed in the transparent substrate 121 .
- FIGS. 13A to 13F are schematic plan views for explaining various embodiments of the present disclosure.
- the light scattering lines may be disposed in various positions and in various shapes around the light emitting devices 10a, 10b, and 10c.
- the light scattering lines are rectangular in shape to define the same area as the light emitting elements 10a, 10b, and 10c along the edges of the light emitting elements 10a, 10b, and 10c. may be placed.
- the light scattering lines may be arranged in a rectangular shape to define an area smaller than that of the light emitting elements 10a, 10b, and 10c.
- the light scattering lines may be arranged to define a larger area than the light emitting elements 10a, 10b, and 10c.
- the light scattering lines may be arranged to cross each light emitting element 10a, 10b, 10c in a vertical direction, as shown in FIG. 13C , or in a diagonal direction as shown in FIG. 13D . It may be arranged to cross the 13E illustrates light scattering lines arranged to define a larger area than the light emitting elements. Furthermore, the rectangles defined by the light scattering lines may be arranged to be in contact with each other as shown in FIG. 13E . Furthermore, as shown in FIG. 13F , light scattering lines arranged in a rectangular shape and light scattering lines crossing in a diagonal direction may be disposed to overlap each other.
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Abstract
Description
Claims (20)
- 유닛 픽셀에 있어서,광 입사면 및 광 출사면을 포함하는 투명 기판;상기 투명 기판 상에 배열되고 서로 다른 색상의 광을 방출하는 복수의 발광 소자; 및상기 투명 기판 내에 상기 복수의 발광 소자들의 하나 이상에 대응하여 미리 정해진 패턴으로 배치된 적어도 하나의 광 산란 라인을 포함하고,상기 복수의 발광 소자들로부터 생성된 광은 상기 투명 기판의 광 입사면을 통해 상기 투명 기판으로 입사하고 상기 광 출사면을 통해 상기 투명 기판으로부터 출사하는 유닛 픽셀.
- 청구항 1에 있어서,상기 적어도 하나의 광 산란 라인은 연속적인 보이드 또는 서로 이격된 보이드들을 포함하는 유닛 픽셀.
- 청구항 1에 있어서,상기 적어도 하나의 광 산란 라인은 상기 투명 기판의 일측면에서 그것에 대향하는 타측면까지 연장하는 유닛 픽셀.
- 청구항 3에 있어서,상기 적어도 하나의 광 산란 라인은 서로 직교하도록 위치하는 복수의 광 산란 라인들을 포함하는 유닛 픽셀.
- 청구항 4에 있어서,상기 복수의 광 산란 라인들은 상기 발광 소자들을 둘러싸도록 배치된 유닛 픽셀.
- 청구항 4에 있어서,상기 복수의 발광 소자들에 대응하며 상기 복수의 발광 소자들 중 하나 이상을 노출하는 복수의 창을 더 포함하고,상기 복수의 광 산란 라인들은 상기 복수의 창들 중 하나 이상의 창을 가로질러 연장함으로써 상기 발광 소자들 중 적어도 하나와 중첩하는 유닛 픽셀.
- 청구항 6에 있어서,상기 복수의 광 산란 라인들은 상기 전체 발광 소자들을 가로지르는 제1 라인과 상기 발광 소자들 각각을 가로지르는 복수의 제2 라인들을 포함하는 유닛 픽셀.
- 청구항 1에 있어서,상기 투명 기판과 동일면 상에 배치된 상기 복수의 발광 소자들 사이에 배치된 광차단층을 더 포함하되,상기 광 차단층은 상기 발광 소자들에서 생성된 광을 통과시키도록 구성된 적어도 하나의 창을 갖고,상기 적어도 하나의 광 산란 라인은 상기 창에 대응하도록 배치된 유닛 픽셀.
- 청구항 8에 있어서,상기 광 차단층은 상기 발광 소자들에 각각 대응하는 복수의 창을 갖고,상기 적어도 하나의 광 산란 라인은 상기 복수의 창 주위에 또는 복수의 창을 가로질러 배치된 복수의 광 산란 라인들을 포함하는 유닛 픽셀.
- 청구항 8에 있어서,상기 적어도 하나의 광 산란 라인은 상기 적어도 하나의 창 상부를 가로지르는 유닛 픽셀.
- 청구항 1에 있어서,상기 적어도 하나의 광 산란 라인은 높이가 평균 10um 이하인 유닛 픽셀.
- 유닛 픽셀에 있어서,제1 서브 픽셀 및 제2 서브 픽셀을 포함하는 복수의 서브 픽셀을 포함하되,상기 제1 서브 픽셀은,제1 투명 기판; 및상기 제1 투명 기판 상에 배치되고 선택된 색상의 광을 방출하는 제1 발광 소자를 포함하고,상기 제2 서브 픽셀은,제2 투명 기판; 및상기 제2 투명 기판 상에 배치되고 상기 제1 발광 소자와 다른 색상의 광을 방출하는 제2 발광 소자를 포함하고,적어도 하나의 광 산란 라인이 제1 투명 기판, 제2 투명 기판, 또는 제1 및 제2 투명 기판 모두에 배치되되, 적어도 하나의 미리 정해진 패턴으로 상기 제1 발광 소자, 제2 발광 소자, 또는 상기 제1 및 제2 발광 소자 주위에 또는 상기 제1 발광 소자, 제2 발광 소자, 또는 상기 제1 및 제2 발광 소자를 가로질러 위치하는 유닛 픽셀.
- 청구항 12에 있어서,상기 제1 투명 기판 및 상기 제2 투명 기판은 광 입사면 및 광 출사면을 포함하는 공통의 투명 기판을 형성하고,상기 적어도 하나의 광 산란 라인은 상기 공통의 투명 기판 내에 배열된 연속적인 보이드 또는 서로 이격된 보이드들을 포함하며,상기 광 산란 라인은 상기 투명 기판의 일 측면에서 그에 대향하는 타 측면까지 연장하는 유닛 픽셀.
- 청구항 12에 있어서,상기 제1 투명 기판은 상기 제1 발광 소자 상에 정렬되고, 상기 제2 투명 기판은 상기 제2 발광 소자 상에 정렬되며,상기 적어도 하나의 광 산란 라인은 상기 제1 투명 기판 및 제2 투명 기판 내에 정렬되고 서로 이격된 보이드들을 포함하며,상기 제1 투명 기판, 제2 투명 기판, 또는 상기 제1 및 제2 투명 기판 모두는 상기 제1 발광 소자, 상기 제2 발광 소자, 또는 상기 제1 및 제2 발광 소자 모두를 성장하기 위한 성장 기판을 포함하는 유닛 픽셀.
- 회로 기판; 및상기 회로 기판 상에 배치된 복수의 유닛 픽셀들을 포함하고,상기 복수의 유닛 픽셀 각각은서로 다른 색상의 광을 방출하는 복수의 발광 소자; 및상기 복수의 발광 소자를 덮고 광 입사면 및 광 출사면을 포함하는 투명 기판; 및상기 투명 기판 내에 상기 상기 복수의 발광 소자들 중 하나 이상에 대응하여 미리 정해진 패턴으로 배치된 적어도 하나의 광 산란 라인을 포함하고,상기 복수의 발광 소자에서 생성된 광은 상기 광 입사면을 통해 상기 투명 기판으로 입사하고 상기 광 출사면을 통해 상기 투명 기판으로부터 출사하는 디스플레이 장치.
- 청구항 15에 있어서,상기 적어도 하나의 광 산란 라인은 연속적인 보이드 또는 서로 이격된 보이드들을 포함하는 디스플레이 장치.
- 청구항 15에 있어서,상기 적어도 하나의 광 산란 라인은 상기 투명 기판의 일측면에서 그것에 대향하는 타측면까지 연장하는 디스플레이 장치.
- 청구항 15에 있어서,상기 복수의 발광 소자들은 서로 이격되어 상기 투명 기판 상에 정렬되고, 각각의 유닛 픽셀은 상기 투명 기판과 상기 각 발광 소자 사이에 배치된 광차단층을 더 포함하되,상기 광 차단층은 상기 발광 소자들에서 생성된 광을 상기 투명 기판의 광 입사면으로 통과시키도록 구성된 적어도 하나의 창을 갖고,상기 적어도 하나의 광 산란 라인은 상기 창에 대응하도록 배치된 디스플레이 장치.
- 청구항 15에 있어서,상기 투명 기판은 서로 이격되고 서로 분리된 복수의 불연속 영역들을 포함하되, 상기 복수의 불연속 영역들은 상기 발광 소자들에 대응하며, 상기 대응하는 발광 소자들 상에 각각 배치되고,상기 적어도 하나의 광 산란 라인은 상기 투명기판의 각 영역에 배치된 디스플레이 장치.
- 청구항 15에 있어서,상기 회로 기판은 복수의 패드들을 포함하고,상기 유닛 픽셀들은 각각 본딩재를 통해 상기 복수의 패드들에 본딩된 디스플레이 장치.
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JP2010134303A (ja) * | 2008-12-08 | 2010-06-17 | Sony Corp | カラー液晶表示装置組立体 |
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