WO2022145657A1 - 표시 장치 및 표시 장치의 제조 방법 - Google Patents
표시 장치 및 표시 장치의 제조 방법 Download PDFInfo
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- WO2022145657A1 WO2022145657A1 PCT/KR2021/014615 KR2021014615W WO2022145657A1 WO 2022145657 A1 WO2022145657 A1 WO 2022145657A1 KR 2021014615 W KR2021014615 W KR 2021014615W WO 2022145657 A1 WO2022145657 A1 WO 2022145657A1
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- WIPO (PCT)
- Prior art keywords
- light emitting
- conductive patterns
- led light
- electrodes
- disposed
- Prior art date
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Definitions
- the present invention relates to a display device, and more particularly, to a display device capable of easily self-aligning an LED light emitting device and a method of manufacturing the display device.
- a flat panel display such as a Liquid Crystal Display Device using an LED Light Emitting Diode as a light source and an Organic Light Emitting Diode Display Device using a self-emitting OLED BACKGROUND ART
- a flat panel display device is in the spotlight as a next-generation display device due to its thin thickness and low power consumption.
- An object of the present invention is to provide a display device capable of self-aligning LED light emitting devices through a conductive pattern and a method of manufacturing the display device.
- Another object of the present invention is to provide a display device capable of realizing a conductive pattern used for self-aligning LED light emitting devices as a touch electrode and a method of manufacturing the display device.
- a display device provides a substrate including a plurality of sub-pixels, a plurality of thin film transistors disposed on the substrate, and a planarization layer disposed on the plurality of thin film transistors. , disposed on the planarization layer, a plurality of first electrodes electrically connected to the plurality of thin film transistors, a plurality of second electrodes disposed on the planarization layer and spaced apart from the plurality of first electrodes, a plurality of first electrodes, and a plurality of a bank disposed to cover a portion of each of the second electrodes of and a plurality of first conductive patterns disposed thereon.
- a method of manufacturing a display device includes preparing a substrate having a plurality of thin film transistors disposed on each of a plurality of sub-pixels, forming a planarization layer on the plurality of thin film transistors, and forming a planarization layer on the planarization layer forming a plurality of first electrodes and a plurality of second electrodes spaced apart from each other on Forming a plurality of first conductive patterns, and self-aligning the plurality of LED light emitting devices by applying a voltage to the plurality of first conductive patterns.
- the process of disposing the LED light emitting device on a substrate can be simplified and the cost can be reduced.
- the touch sensing unit may be configured by arranging an additional conductive pattern together with the conductive pattern used for self-aligning the LED light emitting device.
- the effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present invention.
- FIG. 1 is a plan view of a display device according to an exemplary embodiment.
- FIG. 2 is a cross-sectional view of the display device taken along line II-II' of FIG. 1 .
- FIG 3 is a perspective view of an LED light emitting device of a display device according to an exemplary embodiment.
- FIG. 4 is a cross-sectional view of a display device according to another exemplary embodiment.
- FIG. 5 is a plan view of a display device according to another exemplary embodiment.
- 6A to 6F are cross-sectional views illustrating a method of manufacturing a display device according to another exemplary embodiment.
- references to a device or layer “on” another device or layer includes any intervening layer or other device directly on or in the middle of the other device or layer.
- first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.
- each feature of the various embodiments of the present invention can be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or implemented together in a related relationship. may be
- FIG. 1 is a plan view of a display device according to an exemplary embodiment.
- a display device 100 includes a display area DA and a non-display area NDA.
- the display area DA is an area in which a plurality of pixels are disposed to substantially display an image.
- a pixel including a light emitting area for displaying an image and a driving circuit for driving the pixel may be disposed in the display area DA.
- the non-display area NDA surrounds the display area DA.
- the non-display area NDA is an area in which an image is not substantially displayed, and various wirings, a driving IC, a printed circuit board, etc. for driving pixels and a driving circuit disposed in the display area DA are disposed.
- various ICs such as a gate driver IC and a data driver IC, VSS wirings, etc. may be disposed in the non-display area NDA.
- the plurality of pixels are arranged in a matrix shape, and each of the plurality of pixels includes a plurality of sub-pixels SP.
- the sub-pixel SP is an element for displaying one color, and includes a light emitting area from which light is emitted and a non-emission area from which light is not emitted. is defined as
- the plurality of sub-pixels SP may include, but is not limited to, a first sub-pixel, a second sub-pixel, and a third sub-pixel.
- the first sub-pixel, the second sub-pixel, and the third sub-pixel may be alternately arranged in the first direction (x-axis direction).
- the first sub-pixel, the second sub-pixel, and the third sub-pixel may be alternately arranged in a zigzag shape along the first direction.
- the first sub-pixel and the third sub-pixel are arranged in a first direction (x-axis direction), and the second sub-pixel is spaced apart from the first sub-pixel and the third sub-pixel in the second direction (y-axis direction). and may be arranged along the first direction, but is not limited thereto.
- Each of the plurality of sub-pixels SP may be any one of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel.
- the first sub-pixel may be a red sub-pixel
- the second sub-pixel may be a green sub-pixel
- the third sub-pixel may be a blue sub-pixel.
- the first sub-pixel is a red sub-pixel
- the second sub-pixel is a green sub-pixel
- the third sub-pixel is a blue sub-pixel
- the display device 100 according to an exemplary embodiment of the present invention will be described.
- the color of each sub-pixel is only exemplarily described, and the present invention is not limited thereto.
- the color and arrangement of each sub-pixel SP may be variously changed as needed.
- FIG. 2 is a cross-sectional view of the display device taken along line II-II' of FIG. 1 .
- the substrate 110 is a support member for supporting other components of the display device 100 , and may be made of an insulating material.
- the substrate 110 may be made of glass or resin.
- the substrate 110 may include a polymer or plastic such as polyimide (PI), or may be made of a material having flexibility.
- PI polyimide
- a buffer layer 111 is disposed on the substrate 110 .
- the buffer layer 111 may reduce penetration of moisture or impurities through the substrate 110 .
- the buffer layer 111 may be formed of, for example, a single layer or a multilayer of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto. However, the buffer layer 111 may be omitted depending on the type of the substrate 110 or the type of the transistor 120 , but is not limited thereto.
- the transistor 120 is disposed on the buffer layer 111 .
- the transistor 120 includes an active layer 121 , a gate electrode 122 , a source electrode 123 , and a drain electrode 124 .
- the active layer 121 is disposed on the buffer layer 111 .
- the active layer 121 may be made of a semiconductor material such as an oxide semiconductor, amorphous silicon, or polysilicon, but is not limited thereto.
- the active layer 121 when the active layer 121 is formed of an oxide semiconductor, the active layer 121 includes a channel region, a source region, and a drain region, and the source region and the drain region may be a conductive region, but is limited thereto. doesn't happen
- a gate insulating layer 112 is disposed on the active layer 121 .
- the gate insulating layer 112 is an insulating layer for insulating the active layer 121 and the gate electrode 122, and may be formed of a single layer or a multilayer of silicon oxide (SiOx) or silicon nitride (SiNx), but is limited thereto. doesn't happen
- the gate electrode 122 is disposed on the gate insulating layer 112 .
- the gate electrode 122 may be made of a conductive material, for example, copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or an alloy thereof. However, it is not limited thereto.
- An interlayer insulating layer 113 is disposed on the gate electrode 122 .
- a contact hole for connecting the source electrode 123 and the drain electrode 124 to the active layer 121 is formed in the interlayer insulating layer 113 .
- the interlayer insulating layer 113 may be formed of a single layer or a multilayer of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto.
- the source electrode 123 and the drain electrode 124 are disposed on the interlayer insulating layer 113 .
- the source electrode 123 and the drain electrode 124 may be spaced apart from each other to be electrically connected to the active layer 121 .
- the source electrode 123 and the drain electrode 124 may be formed of a conductive material, for example, copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or the like. It may be composed of an alloy for, but is not limited thereto.
- the common line CL is disposed on the interlayer insulating layer 113 .
- the common line CL may be a wiring for transferring a common voltage to the second electrode 132 .
- the common line CL is the same as the source electrode 123 and the drain electrode 124 , and includes copper (Cu) and aluminum (Al). ), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr) or an alloy thereof, but is not limited thereto.
- a passivation layer 114 is disposed on the source electrode 123 , the drain electrode 124 , and the common line CL.
- the passivation layer 114 may protect the source electrode 123 , the drain electrode 124 , and the common line CL.
- the passivation layer 114 may be formed of a single layer or a multilayer of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto.
- a planarization layer 115 is disposed on the passivation layer 114 .
- the planarization layer 115 is an insulating layer that planarizes an upper portion of the substrate 110 .
- the planarization layer 115 may be made of an organic material, for example, may be formed of a single layer or a multilayer of polyimide or photo acryl, but is not limited thereto.
- a first electrode 131 , a second electrode 132 , and a bank 116 are disposed on the planarization layer 115 .
- the first electrode 131 is electrically connected to the drain electrode 124 through a first contact hole formed in the passivation layer 114 exposing a portion of the drain electrode 124 and the planarization layer 115 . Accordingly, the first electrode 131 may receive the data voltage transmitted through the data line when the thin film transistor 120 is turned on.
- the second electrode 132 is disposed to be spaced apart from the first electrode 131 on the same plane.
- the second electrode 132 is electrically connected to the common line CL through a second contact hole formed in the gate insulating layer 112 , the passivation layer 114 , and the planarization layer 115 exposing a portion of the common line CL. connected Accordingly, the second electrode 132 may receive a common voltage transmitted through the common line CL.
- the first electrode 131 and the second electrode 132 may be formed of a conductive material.
- the first electrode 131 and the second electrode 132 may be formed of, for example, a metal material or a transparent conductive material.
- the plurality of LED light emitting devices 140 may be connected to the first electrode 131 and the second electrode 132 to emit light having a wavelength corresponding to each of the sub-pixels SP.
- the plurality of LED light-emitting devices 140 disposed in the first sub-pixel emit blue light
- the plurality of LED light-emitting devices 140 disposed in the second sub-pixel emit green light
- the third The plurality of LED light emitting devices 140 disposed in the sub-pixel may emit red light, but is not limited thereto.
- the LED light emitting device 140 includes a first device electrode 141 , a first conductive semiconductor layer 142 , an active layer 143 , a second conductive semiconductor layer 144 , and a second device electrode 145 .
- the LED light emitting device 140 is disposed between the first electrode 131 and the second electrode 132 .
- the LED light emitting device 140 may include a first device electrode 141 , a first conductive semiconductor layer 142 , an active layer 143 , a second conductive semiconductor layer 144 , and a second device electrode 145 .
- the first device electrode 141 may be disposed on one end of the first electrode 131 to make contact, and the second device electrode 145 may be disposed on and contact one end of the second electrode 132 . Accordingly, the data voltage and the common voltage may be applied to the LED light emitting device 140 to emit light in the active layer 143 .
- each of the first element electrode 141 and the second element electrode 145 of the LED light emitting element 140 is disposed on one end of the first electrode 131 and one end of the second electrode 132 , although it is illustrated that the first electrode 131 and the second electrode 132 are in contact with each other, the present invention is not limited thereto.
- the LED light emitting device 140 may be disposed on the planarization layer 115 to make contact with ends of the first electrode 131 and the second electrode 132 . A specific structure of the LED light emitting device 140 will be described later.
- the bank 116 is formed on the planarization layer 115 as an insulating layer defining a light emitting region.
- the bank 116 may be made of an organic insulating material, and may be made of the same material as the planarization layer 115 .
- the bank 116 may be configured to include a black material to absorb light in order to prevent the light emitted from the LED light emitting device 140 from being transmitted to the adjacent sub-pixels SP and causing color mixing. have.
- the bank 116 may be selectively disposed as needed, and it is also possible to exclude it.
- the bank 116 covers a portion of each of the plurality of first electrodes 131 and the plurality of second electrodes 132 . Specifically, one of both ends of the bank 116 is disposed on the other end of the first electrode 131 to make contact, and the other of both ends of the bank 116 is the other end of the second electrode 132 . It can be placed on and contacted.
- the bank 116 is disposed to be spaced apart from the LED light emitting device 140 .
- the central portion of the first electrode 131 and the central portion of the second electrode 132 overlap a region where the bank 116 and the LED light emitting device 140 are spaced apart.
- a plurality of first conductive patterns 150 may be formed on the bank 116 .
- the plurality of first conductive patterns 150 are formed to extend in a first direction (x-axis direction).
- the plurality of first conductive patterns 150 may be formed of a transparent electrode.
- the plurality of first conductive patterns 150 may be formed of a transparent conductive material such as an oxide such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), or Zinc Oxide (ZO), or carbon nanotubes (CNT), graphene ( Graphine), silver nanowire, etc. may be included, but is not limited thereto.
- ITO Indium Tin Oxide
- IZO Indium Zinc Oxide
- ZO Zinc Oxide
- CNT carbon nanotubes
- Graphine graphene
- silver nanowire etc.
- Self-alignment of the plurality of LED light emitting devices 140 may be easily achieved by the plurality of first conductive patterns 150 . Specifically, when different voltages are applied to the odd-numbered first conductive pattern 150 and the even-numbered first conductive pattern 150 among the plurality of first conductive patterns 150 , the plurality of LED light emitting devices 140 self-align. can be More specific details will be described with reference to FIGS. 6A to 6F .
- FIG 3 is a perspective view of an LED light emitting device of a display device according to an exemplary embodiment.
- the LED light emitting device 140 may be a cylindrical light emitting nanorod, but is not limited thereto.
- the LED light emitting device 140 includes a first device electrode 141 , a first conductive semiconductor layer 142 , an active layer 143 , a second conductive semiconductor layer 144 , and a second device electrode 145 .
- the first device electrode 141 may supply holes to the active layer 143 .
- the first device electrode 141 includes molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), silver (Ag), titanium (Ti), nickel (Ni), neodymium (Nd), and copper ( Cu) or an alloy thereof.
- the first device electrode 141 may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), but is not limited thereto.
- the first conductive semiconductor layer 142 is disposed on the first device electrode 141 .
- the first conductive semiconductor layer 142 may be a p-type semiconductor layer including a III-V semiconductor material.
- the first conductive semiconductor layer 142 includes a semiconductor material having a composition formula of In x Al y Ga 1-xy N (0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ x+y ⁇ 1) can do.
- the first conductive semiconductor layer 142 may include any one of InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and may be doped with a first conductive dopant, for example, magnesium (Mg). have.
- Mg magnesium
- the active layer 143 is disposed on the first conductive semiconductor layer 142 .
- the active layer 143 is a layer for emitting light of a specific color, and may include one of a red active layer, a green active layer, and a blue active layer. When an electric field is applied, the active layer 143 may emit light due to electron-hole pair bonding.
- the active layer 143 may be formed in a single or multiple quantum well structure.
- the active layer 143 may include a III-V semiconductor material.
- the second conductive semiconductor layer 144 is disposed on the active layer 143 .
- the second conductive semiconductor layer 144 may be an n-type semiconductor layer including a III-V semiconductor material.
- the second conductive semiconductor layer 144 includes a semiconductor material having a composition formula of In x Al y Ga 1-xy N (0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ x+y ⁇ 1) can do.
- the second conductive semiconductor layer 144 may include any one of InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and a second conductive dopant, for example, silicon (Si) or germanium (Ge). , tin (Sn), etc. may be doped.
- the second device electrode 145 may supply electrons to the active layer 143 .
- the second device electrode 145 includes molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), silver (Ag), titanium (Ti), nickel (Ni), neodymium (Nd), and copper ( Cu) or an alloy thereof.
- the second device electrode 145 may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), but is not limited thereto.
- the LED light emitting device When a display device including an LED light emitting device is manufactured, the LED light emitting device is disposed on the display device through a transfer process. However, when the LED light emitting device is disposed through the transfer process, the process time is increased and the yield is lowered.
- a first conductive pattern 150 for self-aligning the LED light emitting devices 140 is disposed in the bank 116 , and the first conductive pattern 150 is formed. can be used to arrange the LED light emitting device 140 on the display device. Accordingly, in the display device 100 according to an embodiment of the present invention, since the plurality of LED light emitting devices 140 can be uniformly aligned at a more accurate position, the alignment defect is minimized and the Reliability can be improved. In addition, in the display device 100 according to an embodiment of the present invention, by self-aligning and disposing the LED light emitting devices 140 , it is possible to reduce process time and reduce costs.
- FIG. 4 is a cross-sectional view of a display device according to another exemplary embodiment.
- 5 is a plan view of a display device according to another exemplary embodiment.
- the display device 200 of FIG. 4 has a different configuration from that of the display device 100 of FIGS. 1 to 3 , except that a plurality of second conductive patterns 260 are disposed to form the touch sensing unit 270 . Since are substantially the same, redundant description is omitted.
- an insulating layer 217 is disposed on the bank 116 , the plurality of first conductive patterns 150 , and the plurality of LED light emitting devices 140 .
- the insulating layer 217 may be a transparent insulating layer.
- the insulating layer 217 may be made of an organic material, for example, a single layer or a multilayer of polyimide or photo acryl, but is not limited thereto.
- the plurality of second conductive patterns 260 are formed on the insulating layer 217 .
- the plurality of second conductive patterns 260 are disposed in a second direction (y-axis direction) crossing the first direction (x-axis direction) in which the plurality of first conductive patterns 150 are arranged.
- the first direction light and the second direction are illustrated as being orthogonal to each other, but the present invention is not limited thereto.
- the first conductive pattern 150 and the second conductive pattern 260 may be electrically isolated from each other.
- the expression “electrically separated” may include content that is not directly electrically connected to each other by being physically separated from each other.
- an insulating layer 217 may be disposed between the first conductive pattern 150 and the second conductive pattern 260 .
- the plurality of second conductive patterns 260 may be made of the same material as the plurality of first conductive patterns 150 , or may be made of different materials.
- the plurality of first conductive patterns 150 and the plurality of second conductive patterns 260 are touch electrodes and may constitute the touch sensing unit 270 .
- the plurality of first conductive patterns 150 may be driving electrodes for application of a driving signal
- the plurality of second conductive patterns 260 may reduce a change in mutual capacitance due to a touch input based on the driving signal. It may be a sensing electrode for sensing.
- a sensing node 271 may be defined in a portion where the first conductive pattern 150 and the second conductive pattern 260 intersect, and the region in which the sensing node 271 is defined is capable of detecting a touch input from a user. It is the smallest possible unit.
- one sensing node 271 may be defined in units of one sub-pixel SP, but regions corresponding to several sub-pixels SP are grouped in units of blocks, so that one sensing node 271 is composed of several sub-pixels SP. It may be defined to correspond to the sub-pixel SP.
- Each sensing node 271 may have a coordinate value.
- the sensing node 271 may have a matrix array corresponding to a Cartesian coordinate system and a corresponding coordinate value.
- the touch sensor chip (not shown) acquires a sensing signal for each sensing node 271 based on a change in mutual capacitance occurring between the plurality of first conductive patterns 150 and the plurality of second conductive patterns 260, The touch position can be calculated.
- the touch sensor chip (not shown) is mounted on a flexible printed circuit board (FPCB) or mounted on a board 217 in the form of COG (Chip-On-Glass) or COB (Chip-On-Board). It may be electrically connected to the first conductive pattern 150 and the second conductive pattern 260 .
- FPCB flexible printed circuit board
- COG Chip-On-Glass
- COB Chip-On-Board
- the display device 200 includes a plurality of first conductive patterns 150 and a plurality of second conductive patterns 260 , and a touch sensor chip (not shown).
- City may further include a plurality of routing wires (RW1, RW2) for electrically connecting.
- the plurality of routing wires (RW1, RW2) are formed in the outer portion of the plurality of first conductive patterns 150 and the plurality of second conductive patterns 260, and are formed at one end of the plurality of first conductive patterns 150.
- the plurality of first conductive patterns 150 and A plurality of second conductive patterns 260 may be connected to a touch sensor chip (not shown).
- the first conductive pattern 150 is not only used for self-alignment of the LED light emitting device 140 , but also crosses the first conductive pattern 150 .
- the second conductive pattern 260 By disposing the second conductive pattern 260 , the first conductive pattern 150 and the second conductive pattern 260 may be used as touch electrodes. Accordingly, it is possible to implement a display device in which the touch sensing unit 270 is internalized. Accordingly, in the display device 200 according to another embodiment of the present invention, the manufacturing process of the touch sensing unit 270 is simplified by using the first conductive pattern as a touch electrode of the touch sensing unit without using a separate touch sensing unit. And, it is possible to reduce the cost for manufacturing the touch sensing unit 270 .
- FIGS. 6A to 6F are cross-sectional views illustrating a method of manufacturing a display device according to another exemplary embodiment. Specifically, FIGS. 6A to 6F show a first electrode 131 , a second electrode 132 , and an LED light emitting device disposed on the planarization layer 115 of the display device 200 according to another embodiment of the present invention. 140) It is a cross-sectional view for explaining a method of manufacturing the first conductive pattern 150 and the second conductive pattern 260 .
- a substrate 110 having a plurality of thin film transistors 120 disposed in each of a plurality of sub-pixels SP is prepared, and a planarization layer 115 is formed on the plurality of thin film transistors 120 .
- the first electrode 131 and the second electrode 132 spaced apart from each other are formed on the planarization layer 115 .
- the first electrode 131 and the second electrode 132 may be simultaneously formed through a photolithography process, but are not limited thereto.
- a bank 116 is formed on one end of the first electrode 131 and one end of the second electrode 132 on the planarization layer 115 , and on the formed bank 116 .
- a first conductive pattern 150 is formed.
- the bank 116 and the first conductive pattern 150 may be formed by a photolithography process, but is not limited thereto.
- the LED light emitting device solution 140S may be injected into the region defined by the bank.
- the LED light emitting device solution 140S may be prepared by mixing the plurality of LED light emitting devices 140 in a solvent.
- the solvent may include, but is not limited to, any one of acetone, water, alcohol, and toluene.
- the plurality of LED light emitting devices 140 are self-aligned between the first electrode 131 and the second electrode 132 .
- the plurality of LED light emitting devices 140 include a first LED light emitting device that emits blue light, a second LED light emitting device that emits green light, and a third LED light emitting device that emits red light.
- the first LED light emitting device may be disposed to correspond to the first sub-pixel.
- the second LED light emitting device may be disposed to correspond to the second sub-pixel.
- the third LED light emitting device may be disposed to correspond to the third sub-pixel.
- the self-aligning step of the LED light-emitting device 140 includes the self-aligning step of the first LED light-emitting device 140 , the self-aligning step of the second LED light-emitting device 140 , and the self-aligning step of the third LED light-emitting device 140 . may include
- the LED light emitting device solution 140S After the LED light emitting device solution 140S is injected, different voltages are applied to the odd-numbered first conductive patterns 150 and the even-numbered first conductive patterns 150 among the plurality of first conductive patterns 150 .
- a positive voltage may be applied to the odd-numbered first conductive pattern 150
- a negative voltage may be applied to the even-numbered first conductive pattern 150 , but is not limited thereto.
- the first device electrode 141 of the first LED light emitting device 140 is aligned toward the first electrode 131
- the second device electrode 145 may be aligned toward the second electrode 132 . That is, as a voltage is applied to the first electrode 131 and the second electrode 132 , the first LED light emitting device 140 may be easily self-aligned.
- the same process as that of the first sub-pixel is performed on the area corresponding to the second sub-pixel and the area corresponding to the third sub-pixel. From this, the LED light emitting device 140 may be self-aligned in the plurality of sub-pixels SP.
- the plurality of LED light emitting devices 140 are connected to the plurality of first electrodes 131 and the plurality of second electrodes 132 . Specifically, when the solvent is dried in a state in which a voltage is applied to the first conductive pattern 150 , the plurality of LED light emitting devices 140 sink toward the first electrode 131 and the second electrode 132 and the first It may be connected to the electrode 131 and the second electrode 132 .
- a plurality of second conductive patterns 260 intersecting the plurality of first conductive patterns 150 are formed to form the touch sensing unit 270 .
- an insulating layer 217 is formed on the plurality of first conductive patterns 150 and the plurality of LED light emitting devices 140 . Thereafter, a plurality of second conductive patterns 260 are formed on the insulating layer 217 to intersect the plurality of first conductive patterns 150 .
- the second conductive pattern 260 may be formed in the same manner as the first conductive pattern 150 . Accordingly, a sensing node 271 is formed in an area where the first conductive pattern 150 and the second conductive pattern 260 intersect, and a plurality of first conductive patterns 150 defining the plurality of sensing nodes 271 and
- the touch sensing unit 270 which is an area formed of the plurality of second conductive patterns 260 , may receive a touch input.
- the red LED light emitting device, the green LED light emitting device and the blue LED light emitting device were directly transferred to the regions corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel. Accordingly, there are disadvantages in that the process time and cost increase, and the yield decreases.
- the plurality of first conductive patterns 150 for self-aligning the plurality of LED light emitting devices 140 may be disposed on the planarization layer 115 .
- the plurality of LED light emitting devices 140 are self-aligned.
- the first element electrode 141 of the plurality of LED light emitting elements 140 is aligned toward the first electrode 131
- the second element electrode 145 of the LED light emitting element 140 is the second electrode. It can be aligned towards (132). Accordingly, the plurality of LED light emitting devices 140 may be easily disposed in the plurality of sub-pixels SP.
- the self-alignment of the plurality of LED light emitting devices 140 may be simultaneously performed for each sub-pixel SP. Specifically, when self-aligning the first LED light emitting device 140 , the entire region corresponding to the first sub-pixel may be opened to proceed with the process. Accordingly, self-alignment of the plurality of first LED light emitting devices 140 may be simultaneously performed in all of the plurality of first sub-pixels. In addition, self-alignment of the plurality of second LED light emitting devices 140 may be simultaneously performed in all of the plurality of second sub-pixels. In addition, self-alignment of the plurality of third LED light emitting devices 140 may be simultaneously performed in all of the plurality of third sub-pixels.
- the self-aligning process of the LED light emitting device 140 may be performed once for each of the plurality of sub-pixels SP. Accordingly, since individual transfer of the LED light emitting device 140 is unnecessary, the process may be simplified. Accordingly, process time may be shortened, cost may be reduced, and yield may be improved.
- the second conductive pattern 260 may be additionally disposed to intersect the first conductive pattern 150 to use the first conductive pattern 150 and the second conductive pattern 260 as a touch electrode. Accordingly, it is possible to implement a display device in which the touch sensing unit 270 is internalized.
- a display device according to an embodiment of the present invention may be described as follows.
- a display device includes a substrate including a plurality of sub-pixels, a plurality of thin film transistors disposed on the substrate, a planarization layer disposed on the plurality of thin film transistors, a planarization layer disposed on the planarization layer, a plurality of first electrodes electrically connected to the thin film transistor of , a bank disposed to define a light emitting area, a plurality of LED light emitting elements disposed in the light emitting area and electrically connected to the plurality of first electrodes and a plurality of second electrodes, and a plurality of first conductive patterns disposed on the bank.
- the plurality of first conductive patterns may be arranged to extend in the first direction on the bank.
- a bank an insulating layer disposed on the plurality of first conductive patterns and the plurality of LED light emitting devices, and a plurality of layers disposed on the insulating layer in a second direction to intersect the plurality of first conductive patterns It may further include a second conductive pattern of.
- a touch sensing unit using the plurality of first conductive patterns and the plurality of second conductive patterns as touch electrodes may be further included.
- the touch sensing unit, a plurality of first routing wires electrically connected to one end of the plurality of first conductive patterns, and a plurality of second wiring electrically connected to one end of the plurality of second conductive patterns 2 may further include routing wires.
- the LED light emitting device may be an LED light emitting device.
- a method of manufacturing a display device includes preparing a substrate having a plurality of thin film transistors disposed on each of a plurality of sub-pixels, forming a planarization layer on the plurality of thin film transistors, and forming a planarization layer on the planarization layer forming a plurality of first electrodes and a plurality of second electrodes spaced apart from each other on Forming a plurality of first conductive patterns, and self-aligning the plurality of LED light emitting devices by applying a voltage to the plurality of first conductive patterns.
- the step of self-aligning the plurality of LED light emitting devices may include the step of injecting a solvent and a plurality of LED light emitting devices in a space defined by the bank.
- the self-aligning of the plurality of LED light emitting devices further includes applying different voltages to the odd-numbered first conductive pattern and the even-numbered first conductive pattern among the plurality of first conductive patterns. can do.
- the self-aligning of the plurality of LED light emitting devices comprises drying the solvent in a state in which a voltage is applied to connect the plurality of LED light emitting devices to the plurality of first electrodes and the plurality of second electrodes. It may include further steps.
- the touch sensing unit further comprising the step of forming a touch sensing unit, the step of forming the touch sensing unit, forming an insulating layer on the bank, the plurality of first conductive patterns and the plurality of LED light emitting devices, and forming a plurality of second conductive patterns on the insulating layer to intersect the plurality of first conductive patterns, wherein the touch sensing unit may include a plurality of first conductive patterns and a plurality of second conductive patterns.
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Abstract
Description
Claims (11)
- 복수의 서브 화소를 포함하는 기판;상기 기판 상에 배치되는 복수의 박막 트랜지스터;상기 복수의 박막 트랜지스터 상에 배치되는 평탄화층;상기 평탄화층 상에 배치되고, 상기 복수의 박막 트랜지스터와 전기적으로 연결된 복수의 제1 전극;상기 평탄화층 상에 배치되고, 상기 복수의 제1 전극과 이격된 복수의 제2 전극;상기 복수의 제1 전극 및 상기 복수의 제2 전극 각각의 일부를 덮고, 발광 영역을 정의하도록 배치되는 뱅크;상기 발광 영역에 배치되고, 상기 복수의 제1 전극 및 상기 복수의 제2 전극에 전기적으로 연결된 복수의 LED 발광 소자; 및상기 뱅크 상에 배치되는 복수의 제1 도전 패턴을 포함하는, 표시 장치.
- 제1항에 있어서,상기 복수의 제1 도전 패턴은 상기 뱅크 상에서 제1 방향으로 연장하도록 배치된, 표시 장치.
- 제2항에 있어서,상기 뱅크, 상기 복수의 제1 도전 패턴 및 상기 복수의 LED 발광 소자 상에 배치되는 절연층; 및상기 절연층 상에서 상기 복수의 제1 도전 패턴과 교차하도록 제2 방향으로 배치되는 복수의 제2 도전 패턴을 더 포함하는, 표시 장치.
- 제3항에 있어서,상기 복수의 제1 도전 패턴 및 상기 복수의 제2 도전 패턴을 터치 전극으로 하는 터치 감지부를 더 포함하는, 표시 장치.
- 제4항에 있어서,상기 터치 감지부는,상기 복수의 제1 도전 패턴의 일 단에 전기적으로 연결된 복수의 제1 라우팅 배선; 및상기 복수의 제2 도전 패턴의 일 단에 전기적으로 연결된 복수의 제2 라우팅 배선을 더 포함하는, 표시 장치.
- 제1항에 있어서,상기 LED 발광 소자는 발광 나노로드인, 표시 장치.
- 복수의 서브 화소 각각에 복수의 박막 트랜지스터가 배치된 기판을 준비하는 단계;상기 복수의 박막 트랜지스터 상에 평탄화층을 형성하는 단계;상기 평탄화층 상에 서로 이격되는 복수의 제1 전극 및 복수의 제2 전극을 형성하는 단계;상기 복수의 제1 전극과 상기 복수의 제2 전극 각각의 일부를 덮고, 발광 영역을 정의하는 뱅크를 형성하는 단계;상기 뱅크 상에 복수의 제1 도전 패턴을 형성하는 단계; 및상기 복수의 제1 도전 패턴에 전압을 인가하여 복수의 LED 발광 소자를 자가 정렬하는 단계를 포함하는, 표시 장치 제조 방법.
- 제7항에 있어서,상기 복수의 LED 발광 소자를 자가 정렬하는 단계는 상기 뱅크에 의해 정의된 공간에 용매 및 상기 복수의 LED 발광 소자를 투입하는 단계를 포함하는, 표시 장치 제조 방법.
- 제8항에 있어서,상기 복수의 LED 발광 소자를 자가 정렬하는 단계는 상기 복수의 제1 도전 패턴 중 홀수번째 제1 도전 패턴과 짝수번째 제1 도전 패턴에 상이한 전압을 인가하는 단계를 더 포함하는, 표시 장치 제조 방법.
- 제9항에 있어서,상기 복수의 LED 발광 소자를 자가 정렬하는 단계는 상기 전압이 인가된 상태에서 상기 용매를 건조하여 상기 복수의 LED 발광 소자를 상기 복수의 제1 전극 및 상기 복수의 제2 전극에 연결시키는 단계를 더 포함하는, 표시 장치 제조 방법.
- 제7항에 있어서,터치 감지부를 형성하는 단계를 더 포함하고,상기 터치 감지부를 형성하는 단계는,상기 뱅크, 상기 복수의 제1 도전 패턴 및 상기 복수의 LED 발광 소자 상에 절연층을 형성하는 단계; 및상기 절연층 상에서 상기 복수의 제1 도전 패턴과 교차하도록 복수의 제2 도전 패턴을 형성하는 단계를 포함하고,상기 터치 감지부는 상기 복수의 제1 도전 패턴과 상기 복수의 제2 도전 패턴으로 이루어지는, 표시 장치 제조 방법.
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CN116349014A (zh) | 2023-06-27 |
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