Display device and method for manufacturing display device

Abstract

According to one aspect of this disclosure, a display device has a plurality of pixels, each pixel including a plurality of sub-pixels. The display device includes: a first substrate; a plurality of first pads disposed on the first substrate and located among the plurality of sub-pixels; a common pad disposed on the first substrate and shared by the plurality of sub-pixels; a second substrate disposed facing the first substrate; a plurality of first electrodes disposed on the second substrate and connected to the plurality of first pads; a second electrode disposed on the second substrate and connected to the common pad; and a plurality of light-emitting nanorods having one end and the other end respectively connected to the plurality of first electrodes and the second electrodes. The plurality of first electrodes and / or second electrodes include a plurality of protrusions connected to the plurality of light-emitting nanorods. Therefore, self-alignment of the light-emitting nanorods can be easily achieved.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit and priority of Korean Patent Application No. 10-2020-0087747, filed in Korea on July 15, 2020, the entire contents of which are hereby expressly incorporated by reference. Technical Field

[0003] This disclosure relates to a display device, and more particularly to a display device capable of easily self-aligning light-emitting nanorods and a method for manufacturing the display device. Background Technology

[0004] Recently, as our society has developed towards an information-oriented society, the field of display devices for visually expressing electrical information signals has developed rapidly. Various display devices with excellent performance in terms of thinness, lightness, and low power consumption are constantly being developed accordingly.

[0005] Specifically, flat panel displays, such as liquid crystal displays that use light-emitting diodes (LEDs) as light sources and organic light-emitting diode (OLED) displays that use self-emissive OLEDs, are attracting attention and becoming the next generation of display devices due to their small thickness and low power consumption.

[0006] The inventors of this disclosure have recognized that, in display devices using LEDs as light-emitting nanorods as light-emitting elements, as described above, process time increases and yield decreases. Specifically, since red, green, and blue light-emitting nanorods are grown and transferred to the display panel separately, process time may increase, leading to lower yield. Furthermore, since the light-emitting nanorods are transferred individually, there may be limitations on reducing the size of the light-emitting nanorods. Summary of the Invention

[0007] Therefore, the inventors of this disclosure have invented a display device and a method for manufacturing the display device, which can reduce process time and cost by using self-aligned light-emitting nanorods during the manufacturing process.

[0008] One object of this disclosure is to provide a display device capable of aligning a light-emitting nanorod via a first electrode and a second electrode, which are respectively electrically connected to one end and the other end of a light-emitting nanorod, as well as a method for manufacturing the display device.

[0009] Another object of this disclosure is to provide a display device and a method of manufacturing the display device, wherein self-alignment can be more easily achieved by forming protrusions on a first electrode and / or a second electrode connected to a light-emitting nanorod.

[0010] The purpose of this disclosure is not limited to the above-mentioned purposes, and other purposes not mentioned above will be clearly understood by those skilled in the art through the following description.

[0011] To address the aforementioned problems, according to one aspect of this disclosure, a display device has a plurality of pixels, each pixel comprising a plurality of sub-pixels. The display device includes: a first substrate; a plurality of first pads disposed on the first substrate and located within the plurality of sub-pixels; a common pad disposed on the first substrate and shared by the plurality of sub-pixels; a second substrate disposed facing the first substrate; a plurality of first electrodes disposed on the second substrate and connected to the plurality of first pads; a second electrode disposed on the second substrate and connected to the common pad; and a plurality of light-emitting nanorods having one end and another end respectively connected to the plurality of first electrodes and the second electrodes. The plurality of first electrodes and / or second electrodes include a plurality of protrusions connected to the plurality of light-emitting nanorods.

[0012] According to another aspect of this disclosure, a display device has a plurality of pixels, each pixel comprising a plurality of sub-pixels. The display device includes: a first substrate and a second substrate facing each other; a plurality of first pads disposed on the first substrate and located within the plurality of sub-pixels; a common pad disposed on the first substrate and shared by the plurality of sub-pixels; a plurality of first electrodes disposed on the second substrate and located within the plurality of sub-pixels; a second electrode disposed on the second substrate and shared by the plurality of sub-pixels; a plurality of light-emitting nanorods disposed on the second substrate and located within the plurality of sub-pixels and in contact with the plurality of first electrodes and the second electrode; and an adhesive pattern connecting the plurality of first pads and the plurality of first electrodes and connecting the common pad and the second electrode. The plurality of first electrodes and / or second electrodes include a plurality of protrusions connected to the plurality of light-emitting nanorods.

[0013] According to another aspect of this disclosure, a method for manufacturing a display device having a plurality of pixels, each pixel including a plurality of sub-pixels, the method comprising: preparing a first substrate, wherein a plurality of first pads disposed among the plurality of sub-pixels and a common pad shared by the plurality of sub-pixels are disposed on the first substrate; forming a first electrode layer and a second electrode layer spaced apart from each other on a second substrate; self-aligning a plurality of light-emitting nanorods by applying a direct current to the first electrode layer and the second electrode layer; separating the first electrode layer and the second electrode layer into a plurality of first electrodes and a plurality of second electrodes respectively, corresponding to the plurality of sub-pixels; and bonding the first substrate and the second substrate by connecting the plurality of first pads and the plurality of first electrodes, and connecting the common pad and the second electrode. The plurality of light-emitting nanorods are connected to a plurality of protrusions of the first electrode layer and / or the second electrode layer and are self-aligned.

[0014] Further details of the exemplary embodiments are included in the detailed description and accompanying drawings.

[0015] According to this disclosure, by applying current to the first and second electrodes of the substrate to self-align the light-emitting nanorods, the process can be simplified and the cost can be reduced.

[0016] According to this disclosure, the alignment accuracy of the luminescent nanorods is improved by concentrating the current on protrusions formed on the first electrode and / or the second electrode.

[0017] The effects of this disclosure are not limited to those illustrated above; this specification includes a variety of other effects. Attached Figure Description

[0018] Figure 1 This is an exploded perspective view of a display device according to an exemplary embodiment of the present disclosure.

[0019] Figure 2 This is an enlarged plan view of the first substrate of a display device according to an exemplary embodiment of the present disclosure.

[0020] Figure 3A This is an enlarged plan view of the second substrate of a display device according to an exemplary embodiment of the present disclosure.

[0021] Figure 3B yes Figure 3A A magnified view of region A.

[0022] Figure 4 It is along Figure 3B A cross-sectional view of the display device taken by line IV-IV'.

[0023] Figure 5 This is a perspective view of light-emitting nanorods of a display device according to an exemplary embodiment of the present disclosure.

[0024] Figures 6A to 6C This is a plan view for explaining a method of manufacturing a second substrate according to an exemplary embodiment of the present disclosure.

[0025] Figures 7 to 10 This is a partially enlarged plan view of the second substrate according to various embodiments of the present disclosure. Detailed Implementation

[0026] The advantages and features of this disclosure, as well as methods for achieving these advantages and features, will become clear from the exemplary embodiments described in detail below with reference to the accompanying drawings. However, this disclosure is not limited to the exemplary embodiments disclosed herein, but will be implemented in various forms. The exemplary embodiments are provided by way of example only to enable those skilled in the art to fully understand the disclosure and scope of this disclosure. Therefore, this disclosure will be limited only by the scope of the appended claims.

[0027] The shapes, dimensions, ratios, angles, quantities, etc., shown in the accompanying drawings to describe exemplary embodiments of this disclosure are merely examples, and this disclosure is not limited thereto. Throughout the specification, the same reference numerals generally denote the same elements. Furthermore, in the following description of this disclosure, detailed explanations of known related technologies may be omitted to avoid unnecessarily obscuring the subject matter of this disclosure. Terms such as “comprising,” “having,” and “consisting of” as used herein are generally intended to allow for the addition of additional components, unless these terms are used in conjunction with the term “only.” Unless otherwise expressly stated, any reference to the singular may include the plural.

[0028] Even if not explicitly stated, the components are interpreted as including the normal error range.

[0029] When using terms such as “above,” “over,” “below,” and “adjacent” to describe the positional relationship between two components, one or more components may be located between the two components unless these terms are used in conjunction with the terms “immediately adjacent” or “directly.”

[0030] When an element or layer is placed "on" another element or layer, the other layer or element can be directly inserted onto or between the other element.

[0031] Although the terms "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 other components. Therefore, the first component mentioned below can be a second component in the technical concept of this disclosure.

[0032] Throughout the specification, the same reference numerals generally denote the same elements.

[0033] The dimensions and thicknesses of each component shown in the accompanying drawings are for ease of description and this disclosure is not limited to the dimensions and thicknesses of the components shown.

[0034] The features of the various embodiments of this disclosure may be partially or wholly dependent on or combined with each other, and may be technically interlocked and operated in a variety of ways, and the embodiments may be performed independently or in association with each other.

[0035] This disclosure will be described in detail below with reference to the accompanying drawings.

[0036] Figure 1 This is an exploded perspective view of a display device according to an exemplary embodiment of the present disclosure. Figure 2 This is an enlarged plan view of the first substrate of a display device according to an exemplary embodiment of the present disclosure. Figure 3A This is an enlarged plan view of the second substrate of a display device according to an exemplary embodiment of the present disclosure. Figure 3B yes Figure 3AA magnified view of region A. Figures 1 to 3B For ease of explanation, among the various components of the display device 100, only the first substrate 110, the first pad 141, the common pad 142, the second substrate 150, the first electrode 161, the second electrode 162, the first dummy electrode 165 and the second dummy electrode 166, the light-emitting nanorod 170, and the adhesive pattern 180 are shown. Figure 3A It can be viewed from the bottom. Figure 1 A view of the second substrate 150 shown. Referring below, reference is made to... Figures 1 to 3B This will mainly describe the planar arrangement of multiple first pads 141, multiple common pads 142, multiple first electrodes 161, multiple second electrodes 162, first dummy electrodes 165 and second dummy electrodes 166, and luminescent nanorods 170.

[0037] refer to Figures 1 to 3B The display device 100 according to an exemplary embodiment of the present disclosure includes a first substrate 110 and a second substrate 150. The first substrate 110 and the second substrate 150 may face each other and may be electrically connected to each other by an adhesive pattern 180.

[0038] The display device has a plurality of pixels PX, each pixel PX comprising a plurality of subpixels. A first substrate 110 and a second substrate 150 each carry various components constituting the plurality of pixels PX. Each of the plurality of pixels PX may include a first subpixel SP1, a second subpixel SP2, and a third subpixel SP3 that emit light of different wavelengths. The plurality of pixels PX is the smallest unit constituting a screen, and each of the plurality of subpixels SP1, SP2, and SP3 may include a light-emitting nanorod 170 and pixel circuitry for driving the light-emitting nanorod 170. The first subpixel SP1, the second subpixel SP2, and the third subpixel SP3 may be a blue subpixel, a green subpixel, and a red subpixel, respectively, but are not limited thereto.

[0039] Multiple first pads 141 and multiple common pads 142 are disposed on the first substrate 110. The multiple first pads 141 and multiple common pads 142 may be spaced apart from each other and are disposed on a planarization layer 115 located above the first substrate 110, which will be described later.

[0040] Multiple first pads 141 can be configured to correspond to corresponding multiple sub-pixels SP1, SP2, and SP3. The multiple first pads 141 can be disposed on one side of the multiple sub-pixels SP1, SP2, and SP3, i.e., on one side of the multiple pixels PX. The multiple first pads 141 can be electrically connected to transistors 120, described later, disposed in the multiple sub-pixels SP1, SP2, and SP3. Furthermore, the multiple first pads 141 can be electrically connected to multiple first electrodes 161 via an adhesive pattern 180.

[0041] Multiple common pads 142 can be configured to correspond to each of multiple pixels PX. Specifically, a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3 of a pixel PX can share a common pad 142. The common pad 142 can be located on the other side of the pixel PX. In this disclosure, although it is shown that the common pad 142 is located on the other side of the second sub-pixel SP2, this disclosure is not limited thereto. The common pad 142 can be electrically connected to a common electrode 130, which will be described later, and the common electrode 130 is sharedly connected to the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3. Moreover, the common pad 142 can be electrically connected to a second electrode 162 via an adhesive pattern 180.

[0042] Multiple first electrodes 161, multiple second electrodes 162, a first dummy electrode 165, a second dummy electrode 166, and multiple light-emitting nanorods 170 are disposed on a second substrate 150. The multiple first electrodes 161, multiple second electrodes 162, and the first dummy electrode 165 and the second dummy electrode 166 can be disposed on the same plane and spaced apart from each other.

[0043] A plurality of first electrodes 161 may be configured to correspond to a plurality of sub-pixels SP1, SP2, and SP3 on a second substrate 150. The plurality of first electrodes 161 may be configured to overlap with a plurality of first pads 141. The plurality of first electrodes 161 may include a first portion 161a overlapping the plurality of first pads 141 and a pair of second portions 161b extending from one end and the other end of the first portion 161a or from one side and the other side of the first portion 161a. A pair of second portions 161b may be configured to be parallel to each other.

[0044] Multiple second electrodes 162 can be configured to correspond to each of the multiple pixels PX on the second substrate 150. Specifically, a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3 of a pixel PX can share a single second electrode 162. The second electrode 162 can be configured to face the multiple first electrodes 161 in the pixel PX. Furthermore, the multiple second electrodes 162 can be configured to overlap with the multiple common pads 142.

[0045] The plurality of second electrodes 162 may include line electrodes 162a overlapping with a plurality of common pads 142 and a plurality of branch electrodes 162b extending from the line electrodes 162a toward a plurality of first electrodes 161. The line electrodes 162a may be parallel to a first portion 161a of the first electrodes 161 and may be shared in a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The plurality of branch electrodes 162b may be surrounded by the plurality of first electrodes 161. The branch electrodes 162b may extend parallel to a pair of second portions 161b in each of the plurality of sub-pixels SP1, SP2, and SP3. In the plurality of sub-pixels SP1, SP2, and SP3, the branch electrodes 162b may be positioned between a pair of second portions 161b.

[0046] The plurality of second electrodes 162 may further include a plurality of second protrusions 162c projecting from the branch electrode 162b toward the paired second portions 161b. The plurality of second protrusions 162c may be formed to narrow in width from the branch electrode 162b toward the second portions 161b. Furthermore, the ends of the plurality of second protrusions 162c may have a pointed shape. That is, the plurality of second protrusions 162c may have a triangular shape, but are not limited thereto.

[0047] Multiple light-emitting nanorods 170 can be attached to multiple second protrusions 162c. The multiple light-emitting nanorods 170 can be easily aligned via the multiple second protrusions 162c. Specifically, when the multiple light-emitting nanorods 170 are self-aligned, current is concentrated on the multiple second protrusions 162c, making it easy to align the multiple light-emitting nanorods 170. This will be referred to later. Figures 6A to 6C To describe.

[0048] At the same time, although Figures 1 to 3B It is shown that a plurality of second protrusions 162c are formed on the second electrode 162, but a plurality of first protrusions may be formed on the first electrode 161. In this case, a plurality of first protrusions may protrude from a pair of second portions 161b toward the branch electrode 162b. Furthermore, although Figures 1 to 3B Ten second protrusions 162c are shown in a subpixel SP1, SP2 or SP3, but this disclosure is not limited thereto.

[0049] First dummy electrodes 165 and second dummy electrodes 166 are disposed outside a plurality of pixels PX to be adjacent to a plurality of portions of the plurality of pixels PX. Before alignment of the light-emitting nanorods 170, the first dummy electrodes 165 and second dummy electrodes 166 may be connected to a plurality of first electrodes 161 and a plurality of second electrodes 162. After alignment of the light-emitting nanorods 170, the first dummy electrodes 165 and second dummy electrodes 166 may be separated from the plurality of first electrodes 161 and the plurality of second electrodes 162. The first dummy electrode 165 may include a first dummy protrusion 165a separated from the first electrode 161, and the second dummy electrode 166 may include a second dummy protrusion 166a separated from the second electrode 162. The first dummy protrusion 165a may be disposed on the same line as a first portion 161a of the plurality of first electrodes 161. The second dummy protrusion 166a may be disposed on the same line as a line electrode 162a of the plurality of second electrodes 162. Reference will be made later. Figures 6A to 6C Describe dummy electrodes 165 and 166.

[0050] Meanwhile, although the accompanying drawings show the first dummy electrode 165 and the second dummy electrode 166 respectively disposed on the upper and lower sides of the second substrate 150, this disclosure is not limited thereto. That is, the number and arrangement of the first dummy electrode 165 and the second dummy electrode 166 can be varied according to the number and arrangement of pixels PX connected to the first dummy electrode 165 and the second dummy electrode 166 during the manufacturing process.

[0051] Multiple light-emitting nanorods 170 are disposed between a first electrode 161 and a second electrode 162. One end of each light-emitting nanorod 170 can be electrically connected to the first electrode 161, and the other end of each light-emitting nanorod 170 can be electrically connected to the second electrode 162. Specifically, one end of each light-emitting nanorod 170 can be connected to a second portion 161b, and the other end of each light-emitting nanorod 170 can be connected to a second protrusion 162c of a branch electrode 162b.

[0052] Multiple light-emitting nanorods 170 can be connected to a first electrode 161 and a second electrode 162 to emit light having a wavelength corresponding to each of the sub-pixels SP1, SP2, and SP3. For example, multiple light-emitting nanorods 170 disposed in the first sub-pixel SP1 can emit blue light, multiple light-emitting nanorods 170 disposed in the second sub-pixel SP2 can emit green light, and multiple light-emitting nanorods 170 disposed in the third sub-pixel SP3 can emit red light, but this disclosure is not limited thereto.

[0053] An adhesive pattern 180 is disposed on a first portion 161a of the first electrode 161 and a line electrode 162a of the second electrode 162. The adhesive pattern 180 is configured to overlap with a plurality of first pads 141 and a plurality of common pads 142. The adhesive pattern 180 can electrically connect the first pads 141 of the first substrate 110 and the first electrodes 161 of the second substrate 150. Furthermore, the adhesive pattern 180 can electrically connect the common pads 142 of the first substrate 110 and the second electrodes 162 of the second substrate 150.

[0054] In the following text, reference will be made to Figure 4 A sub-pixel SP2 of the display device 100 is described in more detail. Figure 4 The cross-sectional view shown can be a cross-sectional view of the second sub-pixel SP2. However, apart from the common pad 142, Figure 4 The structure can be applied equally to the first sub-pixel SP1 and the third sub-pixel SP3.

[0055] Figure 4 It is along Figure 3B A cross-sectional view of the display device taken by line IV-IV'.

[0056] refer to Figure 4 The first substrate 110 is a support member for supporting other components of the display device 100 and may be formed of an insulating material. For example, the first substrate 110 may be formed of glass or resin. In addition, the first substrate 110 may be formed of a polymer or plastic including polyimide (PI), or may be formed of a flexible material.

[0057] A buffer layer 111 is disposed on the first substrate 110. The buffer layer 111 can reduce the penetration of moisture or impurities through the first substrate 110. The buffer layer 111 can be made of, for example, a single layer or multiple layers of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto. However, depending on the type of the first substrate 110 or the type of the transistor 120, the buffer layer 111 may be omitted, but is not limited thereto.

[0058] Transistor 120 is disposed on buffer layer 111. Transistor 120 includes active layer 121, gate electrode 122, source electrode 123 and drain electrode 124.

[0059] An active layer 121 is disposed on a buffer layer 111. The active layer 121 may be formed of a semiconductor material such as oxide semiconductor, amorphous silicon, or polycrystalline silicon, but is not limited thereto. For example, when the active layer 121 is formed of oxide semiconductor, the active layer 121 includes a channel region, a source region, and a drain region, and the source region and drain region may be conductive regions, but are not limited thereto.

[0060] A gate insulating layer 112 is disposed on the active layer 121. The gate insulating layer 112 is an insulating layer used to insulate the active layer 121 and the gate electrode 122, and may be composed of a single layer or multiple layers of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto.

[0061] The gate electrode 122 is disposed on the gate insulating layer 112. The gate electrode 122 may be formed of a conductive material, such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or alloys thereof, but is not limited thereto.

[0062] An interlayer insulating layer 113 is disposed on the gate electrode 122. Contact holes for connecting the source electrode 123 and the drain electrode 124 to the active layer 121 are formed in the interlayer insulating layer 113 and the gate insulating layer 112. The interlayer insulating layer 113 may be composed of a single layer or multiple layers of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto.

[0063] Source electrode 123 and drain electrode 124 are disposed on interlayer insulating layer 113. Source electrode 123 and drain electrode 124 may be spaced apart from each other and electrically connected to active layer 121. Source electrode 123 and drain electrode 124 may be formed of conductive material, such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr) or alloys thereof, but are not limited thereto.

[0064] A common electrode 130 is disposed on the interlayer insulating layer 113. The common electrode 130 may be an electrode not only disposed in the second sub-pixel SP2, but also shared in the first sub-pixel SP1 and the third sub-pixel SP3. The common electrode 130 may be electrically connected to a common voltage line and receive a common voltage. The common electrode 130 may be formed of copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or alloys thereof, but is not limited thereto.

[0065] A passivation layer 114 is disposed on the source electrode 123, the drain electrode 124, and the common electrode 130. The passivation layer 114 can protect the source electrode 123, the drain electrode 124, and the common electrode 130. The passivation layer 114 can be composed of a single layer or multiple layers of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto.

[0066] A planarization layer 115 is disposed on the passivation layer 114. The planarization layer 115 is an insulating layer that planarizes the upper part of the first substrate 110. Contact holes for connecting the drain electrode 124 and the common electrode 130 to the first pad 141 and the common pad 142, respectively, are formed in the planarization layer 115 and the passivation layer 114. The planarization layer 115 may be made of an organic material, such as single or multiple layers of polyimide or photopolymer acrylic, but is not limited thereto.

[0067] First pad 141 and common pad 142 are disposed on planarization layer 115. First pad 141 may be electrically connected to, but is not limited to, the drain electrode 124 of transistor 120, and may be connected to the source electrode 123. Common pad 142 may be electrically connected to common electrode 130. First pad 141 and common pad 142 may be formed of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), silver (Ag), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or alloys thereof, but are not limited to these.

[0068] The second substrate 150 is positioned facing the first substrate 110. The second substrate 150 is a support member for supporting other components of the display device 100 and may be formed of an insulating material. For example, the second substrate 150 may be formed of glass or resin. Furthermore, the second substrate 150 may be formed of a polymer or plastic including polyimide (PI), or may be formed of a flexible material.

[0069] A first electrode 161 is disposed on a second substrate 150 to correspond to a first pad 141. Specifically, based on Figure 4 A first electrode 161 may be disposed on the lower surface of the second substrate 150 facing the first pad 141. The first electrode 161 may include a first portion 161a overlapping the first pad 141 and a second portion 161b extending from the first portion 161a. The first portion 161a may be electrically connected to the first pad 141 by an adhesive pattern 180. Therefore, the first electrode 161 may be connected to the transistor 120 and receive data voltage.

[0070] The second electrode 162 is disposed on the second substrate 150 to correspond to the common pad 142. Specifically, based on Figure 4 The second electrode 162 can be disposed on the lower surface of the second substrate 150 facing the common pad 142. The second electrode 162 may include a line electrode 162a overlapping the common pad 142, a branch electrode 162b extending from the line electrode 162a, and a second protrusion 162c extending from the branch electrode 162b. The line electrode 162a can be electrically connected to the common pad 142 by an adhesive pattern 180. Therefore, the second electrode 162 can be connected to the common electrode 130 and receive a common voltage.

[0071] The first electrode 161 and the second electrode 162 may be formed of conductive materials, such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or alloys thereof, but are not limited thereto.

[0072] A light-emitting nanorod 170 is disposed between a first electrode 161 and a second electrode 162. The light-emitting nanorod 170 may include a first nanorod electrode 171, a first conductive semiconductor layer 172, an active layer 173, a second conductive semiconductor layer 174, and a second nanorod electrode 175. The first nanorod electrode 171 may contact a second portion 161b of the first electrode 161, and the second nanorod electrode 175 may contact a second protrusion 162c of the second electrode 162. Therefore, a data voltage and a common voltage can be applied to the light-emitting nanorod 170, causing light to be emitted from the active layer 173. Although the light-emitting nanorod 170 is shown disposed on a second substrate 150 and contacting the ends of the first electrode 161 and the second electrode 162, this disclosure is not limited thereto. For example, the first nanorod electrode 171 and the second nanorod electrode 175 of the light-emitting nanorod 170 may be disposed on the second portion 161b and the second protrusion 162c, respectively, and may contact the first electrode 161 and the second electrode 162, respectively. The specific structure of the light-emitting nanorod 170 will be described later.

[0073] The adhesive pattern 180 can electrically connect the first pad 141 and the first portion 161a of the first electrode 161. Furthermore, the adhesive pattern 180 can electrically connect the common pad 142 and the line electrode 162a of the second electrode 162. The adhesive pattern 180 can be formed of a conductive material, such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or alloys thereof, but is not limited thereto. Moreover, the bonding of the first pad 141 and the first portion 161a, and the bonding of the common pad 142 and the line electrode 162a, can be performed by eutectic or anisotropic conductive film (ACF) bonding, but this disclosure is not limited thereto.

[0074] Figure 5 This is a perspective view of light-emitting nanorods of a display device according to an exemplary embodiment of the present disclosure.

[0075] refer to Figure 5 The luminescent nanorod 170 includes a first nanorod electrode 171, a first conductive semiconductor layer 172, an active layer 173, a second conductive semiconductor layer 174, and a second nanorod electrode 175 stacked sequentially. The luminescent nanorod 170 can be formed in a cylindrical shape, but is not limited thereto.

[0076] The first nanorod electrode 171 can provide holes to the active layer 173. The first nanorod electrode 171 can be formed of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), silver (Ag), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or alloys thereof. Alternatively, the first nanorod electrode 171 can be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), but is not limited thereto.

[0077] A first conductive semiconductor layer 172 is disposed on the first nanorod electrode 171. The first conductive semiconductor layer 172 may be a p-type semiconductor layer comprising a III-V group semiconductor material. Specifically, the first conductive semiconductor layer 172 may include materials with In... x Al y Ga 1-x-y Semiconductor materials with a composition of N (0≤x≤1, 0≤y≤1, 0≤x+y≤1). For example, the first conductive semiconductor layer 172 may include any one of InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and may be doped with a first conductive dopant, such as magnesium (Mg).

[0078] An active layer 173 is disposed on the first conductive semiconductor layer 172. The active layer 173 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 173 emits light through electron-hole pair recombination. The active layer 173 may have a single or multiple quantum well structures. The active layer 173 may comprise a III-V group semiconductor material.

[0079] A second conductive semiconductor layer 174 is disposed on the active layer 173. The second conductive semiconductor layer 174 may be an n-type semiconductor layer comprising a III-V group semiconductor material. Specifically, the second conductive semiconductor layer 174 may include an n-type semiconductor layer with In... x Al y Ga 1-x-y Semiconductor materials with a composition of N (0≤x≤1, 0≤y≤1, 0≤x+y≤1). For example, the second conductive semiconductor layer 174 may include any one of InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and may be doped with a second conductive dopant, such as silicon (Si), germanium (Ge), tin (Sn), etc.

[0080] The second nanorod electrode 175 can provide electrons to the active layer 173. The second nanorod electrode 175 can be formed of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), silver (Ag), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or alloys thereof. Alternatively, the second nanorod electrode 175 can be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), but is not limited thereto.

[0081] Figures 6A to 6C This is a plan view used to explain a method of manufacturing a display device according to exemplary embodiments of the present disclosure. Specifically, Figures 6A to 6CThis is a plan view for explaining a method of manufacturing a first electrode 161, a second electrode 162, a first dummy electrode 165 and a second dummy electrode 166, a light-emitting nanorod 170 and an adhesive pattern 180 disposed on a second substrate 150 of a display device 100 according to an exemplary embodiment of the present disclosure.

[0082] First, refer to Figure 6A The step of forming a first electrode layer 610 and a second electrode layer 620 spaced apart from each other is performed on the second substrate 150. The first electrode layer 610 and the second electrode layer 620 can be formed by depositing electrode material on the second substrate 150 using a mask. The electrode material can be made of a conductive material, such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or alloys thereof, but is not limited thereto.

[0083] The first electrode layer 610 includes a dummy portion 611, a first portion 612, and a second portion 613. The second electrode layer 620 includes a dummy portion 621, a first portion 622, and a second portion 623. The shapes of the dummy portions 611 and 621, the first portions 612 and 622, and the second portions 613 and 623 are not limited to specific shapes. Figures 6A to 6C The ones shown can be varied depending on the number and arrangement of pixels (PX).

[0084] The dummy portion 611 of the first electrode layer 610 and the dummy portion 621 of the second electrode layer 620 are configured to be parallel to each other on the first substrate 150. The dummy portions 611 and 621 can be configured to correspond to the exterior of a plurality of pixels PX. The dummy portions 611 and 621 can be regions that are separated from the first portions 612 and 622 after the self-alignment of the light-emitting nanorods 170 is completed.

[0085] A first portion 612 of the first electrode layer 610 extends from the dummy portion 611 of the first electrode layer 610 toward the dummy portion 621 of the second electrode layer 620. Furthermore, a first portion 622 of the second electrode layer 620 extends from the dummy portion 621 of the second electrode layer 620 toward the dummy portion 611 of the first electrode layer 610. The first portion 612 of the first electrode layer 610 and the first portion 622 of the second electrode layer 620 can be configured to face each other and be parallel to each other. For example, the first portion 612 of the first electrode layer 610 and the first portion 622 of the second electrode layer 620 can be configured to correspond to one side and the other side of pixel PX or sub-pixels SP1, SP2, SP3, respectively.

[0086] The second portion 613 of the first electrode layer 610 extends from the first portion 612 of the first electrode layer 610 toward the first portion 622 of the second electrode layer 620. In this case, the second portion 613 of the first electrode layer 610 includes a thin second portion and a thick second portion. For example, the thin second portion 613 can be configured to correspond to the upper and lower sides of pixel PX. The thick second portion 613 can be configured to correspond to the boundary between adjacent first sub-pixels SP1 and second sub-pixels SP2, and the boundary between adjacent second sub-pixels SP2 and third sub-pixels SP3. After the self-alignment of the light-emitting nanorods 170 is completed, the thick second portion 613 can be divided into two parts and disposed one by one on the upper or lower side of sub-pixels SP1, SP2, or SP3.

[0087] The second portion 623 of the second electrode layer 620 extends from the first portion 622 of the second electrode layer 620 toward the first portion 612 of the first electrode layer 610. The second portion 623 of the second electrode layer 620 can be configured parallel to the second portion 613 of the first electrode layer 610. Furthermore, the second portion 623 of the second electrode layer 620 can be disposed between two adjacent second portions 613 of the first electrode layer 610. In this case, the second portion 623 of the second electrode layer 620 can be configured to correspond to each of sub-pixels SP1, SP2, and SP3.

[0088] The second portion 623 of the second electrode layer 620 includes a protrusion 623c protruding toward the second portion 613 of the first electrode layer 610. Figure 6A The diagram shows a protrusion 623c formed on a second portion 623 of the second electrode layer 620, but this disclosure is not limited thereto. That is, a protrusion can be formed from a second portion 613 of the first electrode layer 610 toward a second portion 623 of the second electrode layer 620.

[0089] refer to Figure 6B The process involves self-aligning a plurality of light-emitting nanorods 170 between the first electrode layer 610 and the second electrode layer 620. The plurality of light-emitting nanorods 170 includes a first light-emitting nanorod emitting blue light, a second light-emitting nanorod emitting green light, and a third light-emitting nanorod emitting red light. The first light-emitting nanorod can be configured to correspond to a first sub-pixel SP1. The second light-emitting nanorod can be configured to correspond to a second sub-pixel SP2. The third light-emitting nanorod can be configured to correspond to a third sub-pixel SP3.

[0090] The step of self-aligning multiple luminescent nanorods 170 may include a step of self-aligning a first luminescent nanorod, a step of self-aligning a second luminescent nanorod, and a step of self-aligning a third luminescent nanorod.

[0091] Specifically, photoresist is applied to the second substrate 150 on which the first electrode layer 610 and the second electrode layer 620 are formed, and only the region corresponding to the first sub-pixel SP1 is etched. The first electrode layer 610 and the second electrode layer 620 corresponding to the first sub-pixel SP1 can be exposed in the region opened by etching. Furthermore, a first luminescent nanorod solution can be injected into the opened region. In this case, the first luminescent nanorod solution can be prepared by mixing multiple first luminescent nanorods in a solvent. The solvent may include, but is not limited to, any one of acetone, water, alcohol, and toluene.

[0092] After the luminescent nanorod solution is injected, a direct current (DC) is applied to the first electrode layer 610 and the second electrode layer 620. For example, a negative current can be applied to the first electrode layer 610 and a positive current can be applied to the second electrode layer 620, but this disclosure is not limited thereto. When a DC current is applied to the first electrode layer 610 and the second electrode layer 620, the first nanorod electrode 171 of the first luminescent nanorod can be aligned with the first electrode layer 610, and the second nanorod electrode 172 of the first luminescent nanorod can be aligned with the second electrode layer 620. That is, when a DC current is applied to the first electrode layer 610 and the second electrode layer 620, the first luminescent nanorod can easily self-align.

[0093] Next, the photoresist is completely removed, and the regions corresponding to the second sub-pixel SP2 and the third sub-pixel SP3 are processed in the same way as the first sub-pixel SP1. Thus, the luminescent nanorod 170 can self-align among the multiple sub-pixels SP1, SP2, and SP3.

[0094] Specifically, the second nanorod electrode 175 of the light-emitting nanorod 170 can be connected to the protrusion 623c of the second electrode layer 620. Specifically, when a direct current is applied to the second electrode layer 620, the current can be concentrated on the protrusion 623c. Therefore, the second nanorod electrode 175 can be aligned by being attracted toward the protrusion 623c where the current is concentrated. Therefore, the manufacturing efficiency of the display device 100 can be improved by more effectively aligning the multiple light-emitting nanorods 170.

[0095] refer to Figure 6C The steps of separating multiple sub-pixels SP1, SP2 and SP3 and forming adhesive pattern 180 are performed.

[0096] First, in order to set the photoresist and separate the multiple sub-pixels SP1, SP2, and SP3, regions from which multiple portions of electrode layers 610 and 620 are to be removed can be opened. Furthermore, by removing multiple portions of electrode layers 610 and 620, the multiple sub-pixels SP1, SP2, and SP3 can be separated from each other.

[0097] Specifically, the dummy portion 611 and the first portion 612 of the first electrode layer 610 are separated, a portion of the first portion 612 is separated, and the thick second portion 613 can be divided into two parts. The separated dummy portion 611 can become the first dummy electrode 165, the separated first portion 612 can become the first portion 161a of the first electrode 161, and the separated second portion 613 can become the second portion 161b of the first electrode 161. On a portion of the first dummy electrode 165, a first dummy protrusion 165a can remain after separation from the first portion 161a.

[0098] Furthermore, the dummy portion 621 and the first portion 622 of the second electrode layer 620 can be separated, and a portion of the first portion 622 can be separated. The separated dummy portion 621 can become the second dummy electrode 166, the separated first portion 622 can become the line electrode 162a of the second electrode 162, the second portion 623 can become the branch electrode 162b of the second electrode 162, and the protrusion 623c can become the second protrusion 162c of the second electrode 162. On a portion of the second dummy electrode 166, a second dummy protrusion 166a can remain after separation from the line electrode 162a.

[0099] After separating multiple sub-pixels SP1, SP2, and SP3, an adhesive pattern 180 is formed. The adhesive pattern 180 can be disposed on multiple first portions 161a and multiple line electrodes 162a. Furthermore, the adhesive pattern 180 can be disposed in areas corresponding to the first pads 141 and common pads 142 of the first substrate 110.

[0100] Meanwhile, although not shown, the manufacturing process of the display device 100 can be completed by bonding the second substrate 150 according to the manufacturing method described above to the first substrate 110. The first substrate 110 and the second substrate 150 can be electrically connected to each other by an adhesive pattern 180.

[0101] In display devices that include conventional luminescent nanorods, red, green, and blue luminescent nanorods are directly and individually transferred to the regions corresponding to the red, green, and blue subpixels, respectively. This results in increased processing time and cost, as well as decreased yield.

[0102] Therefore, in the display device 100 according to an exemplary embodiment of the present disclosure, a first electrode layer 610 and a second electrode layer 620 for self-aligning light-emitting nanorods 170 can be disposed on a second substrate 150. That is, by injecting a solution including the light-emitting nanorods 170 into the first electrode layer 610 and the second electrode layer 620 and applying a direct current thereto, the light-emitting nanorods 170 can be self-aligned. In other words, the first nanorod electrode 171 of the light-emitting nanorods 170 can be aligned toward the first electrode layer 610 to which a negative current is applied, and the second nanorod electrode 175 of the light-emitting nanorods 170 can be aligned toward the second electrode layer 610 to which a positive current is applied. Therefore, a plurality of light-emitting nanorods 170 can be easily disposed in a plurality of sub-pixels SP1, SP2, and SP3.

[0103] Furthermore, the self-alignment of multiple luminescent nanorods 170 can be performed simultaneously in each of the sub-pixels SP1, SP2, and SP3. Specifically, when the first luminescent nanorod is self-aligned, processing can be performed by opening the entire region corresponding to the first sub-pixel SP1. Therefore, the self-alignment of multiple first luminescent nanorods can be performed simultaneously in all of the multiple first sub-pixels SP1. Furthermore, the self-alignment of multiple second luminescent nanorods can be performed simultaneously in all of the multiple second sub-pixels SP2. Furthermore, the self-alignment of multiple third luminescent nanorods can be performed simultaneously in all of the multiple third sub-pixels SP3. In other words, the process of self-aligning the luminescent nanorods 170 can be performed once for each of the multiple sub-pixels SP1, SP2, and SP3. Therefore, since the individual transfer of the luminescent nanorods 170 is unnecessary, the process can be simplified. Thus, processing time can be shortened, costs can be reduced, and yield can be increased.

[0104] Furthermore, the second portion 623 of the second electrode layer 620 may include a plurality of protrusions 623c. When a direct current is applied to the second electrode layer 620, the current can be concentrated on the plurality of protrusions 623c. The plurality of light-emitting nanorods 170 can be aligned by being attracted to the plurality of protrusions 623c where the current is concentrated. Therefore, the plurality of light-emitting nanorods 170 can be uniformly aligned in accurate positions. Thus, alignment defects can be minimized and the reliability of the display device 100 can be improved.

[0105] Figure 7 This is a partially enlarged plan view of a second substrate according to another exemplary embodiment of the present disclosure. Figure 7 For ease of explanation, only one sub-pixel SP2 from the plurality of sub-pixels SP1, SP2, and SP3 is shown. This is because, apart from the first electrode 161 and the second electrode 162, which respectively include a first protrusion 161c and a second protrusion 162c, Figure 7 Other structures of the second substrate 150 and Figure 1The structure of the second substrate 150 is basically the same, so redundant descriptions will be omitted.

[0106] refer to Figure 7 The first electrode 161 includes a first portion 161a, a pair of second portions 161b and a plurality of first protrusions 161c, and the second electrode 162 includes a line electrode 162a, a branch electrode 162b and a plurality of second protrusions 162c.

[0107] Multiple first protrusions 161c can protrude from a pair of second portions 161b toward the branch electrode 162b. Multiple second protrusions 162c can protrude from the branch electrode 162b toward the pair of second portions 161b. The multiple first protrusions 161c and the multiple second protrusions 162c can be arranged to face each other. Therefore, the multiple first protrusions 161c and the multiple second protrusions 162c can be arranged symmetrically to each other based on an imaginary straight line parallel to the pair of second portions 161b or the branch electrode 162b. The multiple first protrusions 161c can be formed to narrow in width from the second portions 161b toward the branch electrode 162b. Moreover, the multiple second protrusions 162c can be formed to narrow in width from the branch electrode 162b toward the second portions 161b. The ends of the multiple first protrusions 161c and the multiple second protrusions 162c can have a pointed shape. That is, the multiple first protrusions 161c and the multiple second protrusions 162c can have a triangular shape, but are not limited thereto.

[0108] In the second substrate 150 of the display device according to another exemplary embodiment of the present disclosure, both the first electrode 161 and the second electrode 162 may include a plurality of protrusions. That is, the first electrode 161 may include a plurality of first protrusions 161c protruding from a pair of second portions 162b, and the second electrode 162 may include a plurality of second protrusions 162c protruding from branch electrodes 162b. In this case, the plurality of first protrusions 161c and the plurality of second protrusions 162c may be symmetrical to each other and arranged to face each other. Therefore, self-alignment of the plurality of light-emitting nanorods 170 can be performed more easily.

[0109] Specifically, when a direct current is applied to the first electrode 161 and the second electrode 162 for self-alignment of the plurality of light-emitting nanorods 170, the current can be concentrated on the plurality of first protrusions 161c and the plurality of second protrusions 162c. Therefore, the first nanorod electrodes 171 and the second nanorod electrodes 175 of the plurality of light-emitting nanorods 170 can be aligned by being attracted to the plurality of first protrusions 161c and the plurality of second protrusions 162c. Thus, the plurality of light-emitting nanorods 170 can be uniformly aligned at more precise locations, thereby improving alignment accuracy.

[0110] Figure 8 This is a partially enlarged plan view of a second substrate according to another exemplary embodiment of the present disclosure. Figure 8 For ease of explanation, only one sub-pixel SP2 from among the multiple sub-pixels SP1, SP2, and SP3 is shown. This is because, apart from the arrangement of the first protrusion 161c and the second protrusion 162c, Figure 8 Other structures of the second substrate 150 and Figure 7 The second substrate 150 has a basically the same structure, so redundant descriptions will be omitted.

[0111] refer to Figure 8 Each of the plurality of first electrodes 161 includes a first portion 161a, a pair of second portions 161b and a plurality of first protrusions 161c, and each of the plurality of second electrodes 162 includes a line electrode 162a, a plurality of branch electrodes 162b and a plurality of second protrusions 162c.

[0112] Multiple first protrusions 161c can protrude from a pair of second portions 161b toward the branch electrode 162b. Multiple second protrusions 162c can protrude from the branch electrode 162b toward the pair of second portions 161b. The multiple first protrusions 161c and the multiple second protrusions 162c can be configured to be offset from each other based on an imaginary straight line parallel to the pair of second portions 161b or the branch electrode 162b. Moreover, the multiple second protrusions 162c located on the upper part of the branch electrode 162b and the multiple second protrusions 162c located on the lower part of the branch electrode 162b can be configured to be offset from each other.

[0113] One end of a plurality of light-emitting nanorods 170 is connected to a plurality of first protrusions 161c and a plurality of second protrusions 162c, respectively. Since the plurality of first protrusions 161c and the plurality of second protrusions 162c are arranged offset from each other, the plurality of light-emitting nanorods 170 can be arranged diagonally. Therefore, during the self-alignment of the plurality of light-emitting nanorods 170, alignment defects of the plurality of light-emitting nanorods 170 can be reduced, thereby improving the reliability of the display device 100.

[0114] Figure 9 This is a partially enlarged plan view of a second substrate according to yet another exemplary embodiment of the present disclosure. For ease of explanation, Figure 9 Only one sub-pixel SP2 from the multiple sub-pixels SP1, SP2, and SP3 is shown, and... Figure 9 The illustration of the luminescent nanorod 170 is omitted. This is because, apart from the shapes of the first protrusion 161c and the second protrusion 162c, Figure 9 Other structures of the second substrate 150 and Figure 7 The second substrate 150 has a basically the same structure, so redundant descriptions will be omitted.

[0115] refer to Figure 9Each of the plurality of first electrodes 161 includes a first portion 161a, a pair of second portions 161b and a plurality of first protrusions 161c, and each of the plurality of second electrodes 162 includes a line electrode 162a, a plurality of branch electrodes 162b and a plurality of second protrusions 162c.

[0116] Multiple first protrusions 161c can protrude from a pair of second portions 161b toward the branch electrode 162b. Multiple second protrusions 162c can protrude from the branch electrode 162b toward the pair of second portions 161b. The multiple first protrusions 161c and the multiple second protrusions 162c can be symmetrical to each other and arranged to face each other. The multiple first protrusions 161c can be formed to narrow in width from the second portions 161b toward the branch electrode 162b. Moreover, the multiple second protrusions 162c can be formed to narrow in width from the branch electrode 162b toward the second portions 161b.

[0117] The ends of the plurality of first protrusions 161c and second protrusions 162c can have rounded corners. Therefore, the contact area between the plurality of first protrusions 161c and second protrusions 162c and the plurality of light-emitting nanorods 170 can be increased. This reduces the resistance between the plurality of first protrusions 161c and second protrusions 162c and the plurality of light-emitting nanorods 170, and improves the luminous efficiency of the display device 100.

[0118] Figure 10 This is a partially enlarged plan view of a second substrate according to another exemplary embodiment of the present disclosure. Figure 10 For ease of description, only one pixel PX among multiple pixels PX is shown. This is because, in addition to the arrangement of the first electrode 161 and the second electrode 162 in the multiple sub-pixels SP1, SP2, and SP3, Figure 10 Other constructions of the display device and Figure 1 The structure of the display device 100 is basically the same, so redundant descriptions will be omitted.

[0119] refer to Figure 10 Pixel PX comprises a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 can be blue, green, and red sub-pixels, respectively. The first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 can each have different areas. For example, the first sub-pixel SP1 and the second sub-pixel SP2 can have the same area, and the area of ​​the third sub-pixel SP3 can be larger than the areas of the first sub-pixel SP1 and the second sub-pixel SP2.

[0120] The second substrate 150 includes a first electrode 161, a second electrode 162, a plurality of light-emitting nanorods 170, and a plurality of adhesive patterns 180. The first electrode 161 and the second electrode 162 can be disposed in the plurality of sub-pixels SP1, SP2, and SP3 with different structures. Furthermore, the number of light-emitting nanorods 170 disposed in each sub-pixel SP1, SP2, and SP3 can be different.

[0121] The first electrode 161, which is disposed in each of the plurality of sub-pixels, includes a first portion 161a, a pair of second portions 161b, and a plurality of first protrusions 161c.

[0122] In the first sub-pixel SP1, a first portion 161a may overlap with the first pad 141 of the first substrate 110 and may be disposed on a lateral portion of the first sub-pixel SP1. A pair of second portions 161b may extend from one end and the other end of the first portion 161a. The pair of second portions 161b may be arranged parallel to each other. A plurality of first protrusions 161c may protrude from the pair of second portions 161b toward the branch electrode 162b of the second electrode, which will be described later.

[0123] In the second sub-pixel SP2, a first portion 161a may overlap with a first pad 141 of the first substrate 110 and may be disposed on a lateral portion of the second sub-pixel SP2. A pair of second portions 161b may extend from one end and the other end of the first portion 161a. The pair of second portions 161b may be arranged parallel to each other. A plurality of first protrusions 161c may protrude from the pair of second portions 161b toward a branch electrode 162b of the second electrode, which will be described later.

[0124] In the third sub-pixel SP3, the first portion 161a may overlap with the first pad 141 of the first substrate 110 and may have a shape that curves along the periphery of the third sub-pixel SP3 at its lateral portion. A pair of second portions 161b may extend from one end and the other end of the first portion 161a. In this case, the upper second portion of the pair of second portions 161b may have a curved shape, and its lower second portion may have a straight shape. That is, the first portion 161a and the pair of second portions 161b of the first electrode 161 disposed in the third sub-pixel SP3 may be disposed along the periphery of a region in the third sub-pixel SP3 in which no line electrode 162a of the second electrode, described later, is disposed. A plurality of first protrusions 161c may protrude from the pair of second portions 161b toward the branch electrode 162b of the second electrode, described later.

[0125] The second electrode 162 includes a line electrode 162a, a branch electrode 162b, and a plurality of second protrusions 162c. The line electrode 162a may be commonly disposed in the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3. The line electrode 162a may overlap with the common pad 142 of the first substrate 110 and may be commonly disposed on the lateral portions of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3. In the respective plurality of sub-pixels SP1, SP2, and SP3, the branch electrode may extend from the line electrode 162a toward the first electrode 161. The branch electrode 162b may include a branch electrode disposed in the first sub-pixel SP1, a branch electrode disposed in the second sub-pixel SP2, and a branch electrode disposed in the third sub-pixel SP3. The branch electrode 162b may be disposed between a pair of second portions 161b in the respective sub-pixels SP1, SP2, and SP3. The plurality of second protrusions 162c may protrude from the branch electrode 162b toward the paired second portions 161b.

[0126] In each of sub-pixels SP1, SP2, and SP3, a plurality of first protrusions 161c and second protrusions 162c can be formed in different numbers. For example, the number of the plurality of first protrusions 161c and second protrusions 162c can decrease in the order of third sub-pixel SP3, first sub-pixel SP1, and second sub-pixel SP2. Since the number of the plurality of first protrusions 161c and second protrusions 162c is different in each of sub-pixels SP1, SP2, and SP3, the number of the plurality of light-emitting nanorods 170 attached thereto can also be different in each of sub-pixels SP1, SP2, and SP3. For example, the number of the plurality of light-emitting nanorods 170 can decrease in the order of third sub-pixel SP3, first sub-pixel SP1, and second sub-pixel SP2.

[0127] Specifically, Table 1 shows the required number of light-emitting nanorods based on the efficiency of the corresponding sub-pixels SP1, SP2 and SP3 set in pixel PX.

[0128] Table 1

[0129]

[0130] Referring to Table 1, it can be confirmed that the efficiency of the luminescent nanorods improves in the order of the luminescent nanorods in the third sub-pixel SP3, the first sub-pixel SP1, and the second sub-pixel SP2. Furthermore, the brightness and current required for each sub-pixel SP1, SP2, and SP3 may be completely different. Therefore, it can be confirmed that a ratio of 2:1:10 for the luminescent nanorods in the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 is suitable.

[0131] In a second substrate 150 according to another exemplary embodiment of the present disclosure, the number of light-emitting nanorods 170 can be configured differently in each sub-pixel SP1, SP2, and SP3 depending on the efficiency of the light-emitting nanorods 170 disposed in each sub-pixel SP1, SP2, and SP3. For example, since the light-emitting nanorods of the third sub-pixel SP3 have the lowest luminous efficiency, the size of the third sub-pixel SP3 in pixel PX, the number of the plurality of first protrusions 161c and second protrusions 162c, and the number of the plurality of light-emitting nanorods 170 can be increased more than those of the other sub-pixels SP1 and SP2. Furthermore, since the light-emitting nanorods of the second sub-pixel SP2 have the best luminous efficiency, the number of the plurality of first protrusions 161c and second protrusions 162c of the second sub-pixel SP2 in pixel PX can be reduced more than those of the other sub-pixels SP1 and SP3.

[0132] In other words, the number of multiple first protrusions 161c and second protrusions 162c, as well as the number of multiple light-emitting nanorods 170, can be adjusted so that the efficiency of each sub-pixel SP1, SP2, and SP3 is uniform within a pixel PX. Therefore, the efficiency and quality of the display device 100 can be improved.

[0133] Exemplary embodiments of this disclosure can also be described as follows:

[0134] According to one aspect of this disclosure, a display device has a plurality of pixels, each pixel including a plurality of sub-pixels. The display device includes: a first substrate; a plurality of first pads disposed on the first substrate and located among the plurality of sub-pixels; a common pad disposed on the first substrate and shared by the plurality of sub-pixels; a second substrate disposed facing the first substrate; a plurality of first electrodes disposed on the second substrate and connected to the plurality of first pads; a second electrode disposed on the second substrate and connected to the common pad; and a plurality of light-emitting nanorods having one end and the other end respectively connected to the plurality of first electrodes and the second electrodes. The plurality of first electrodes and / or second electrodes include a plurality of protrusions connected to the plurality of light-emitting nanorods.

[0135] Each of the plurality of first electrodes may include a first portion and a pair of second portions extending from one end and the other end of the first portion. The second electrodes may include a wire electrode and a plurality of branch electrodes extending from the wire electrode toward the plurality of first electrodes. Each of the plurality of branch electrodes may be disposed between the pair of second portions.

[0136] The plurality of first electrodes may include a plurality of protrusions. The plurality of protrusions may protrude from a pair of second portions toward the plurality of branch electrodes. The plurality of protrusions may be formed to narrow in width from the pair of second portions toward the plurality of branch electrodes.

[0137] The second electrode may include multiple protrusions. These protrusions may project from the multiple branch electrodes toward a pair of second portions. The multiple protrusions may be configured to narrow in width from the multiple branch electrodes toward the pair of second portions.

[0138] The plurality of protrusions may include a plurality of first protrusions protruding from a pair of second portions toward a plurality of branch electrodes; and a plurality of second protrusions protruding from the plurality of branch electrodes toward a pair of second portions.

[0139] Multiple first protrusions and multiple second protrusions can be arranged symmetrically about an imaginary straight line parallel to multiple branch electrodes or a pair of second parts.

[0140] Multiple first protrusions and multiple second protrusions can be configured to be offset from each other based on an imaginary straight line parallel to multiple branch electrodes or a pair of second parts.

[0141] Multiple protrusions are attached to the ends of multiple luminescent nanorods and can have pointed or rounded shapes.

[0142] Multiple subpixels can include blue subpixels, green subpixels, and red subpixels. The number of luminescent nanorods set in the red subpixel can be greater than the number of luminescent nanorods set in the blue and green subpixels.

[0143] The display device may also include a plurality of dummy electrodes disposed on a second substrate to correspond to the exterior of a plurality of pixels and spaced apart from a plurality of first electrodes and second electrodes.

[0144] According to another aspect of this disclosure, a display device has a plurality of pixels, each pixel including a plurality of sub-pixels. The display device includes: a first substrate and a second substrate facing each other; a plurality of first pads disposed on the first substrate and located within the plurality of sub-pixels; a common pad disposed on the first substrate and shared by the plurality of sub-pixels; a plurality of first electrodes disposed on the second substrate and located within the plurality of sub-pixels; a second electrode disposed on the second substrate and shared by the plurality of sub-pixels; a plurality of light-emitting nanorods disposed on the second substrate and located within the plurality of sub-pixels and in contact with the plurality of first electrodes and the second electrode; and an adhesive pattern connecting the plurality of first pads and the plurality of first electrodes and connecting the common pad and the second electrode. The plurality of first electrodes and / or second electrodes include a plurality of protrusions connected to the plurality of light-emitting nanorods.

[0145] Each of the plurality of first electrodes may include a first portion and a pair of second portions extending from both ends of the first portion. The second electrodes may include a wire electrode and a plurality of branch electrodes extending from the wire electrode toward the plurality of first electrodes. The plurality of branch electrodes may be surrounded by the plurality of first electrodes.

[0146] The plurality of protrusions may include a plurality of first protrusions protruding from a pair of second portions toward a plurality of branch electrodes; and a plurality of second protrusions protruding from the plurality of branch electrodes toward a pair of second portions.

[0147] Multiple subpixels can include blue subpixels, green subpixels, and red subpixels. The number of luminescent nanorods set in the red subpixel can be greater than the number of luminescent nanorods set in the blue and green subpixels.

[0148] According to another aspect of this disclosure, a method for manufacturing a display device is provided. The display device has a plurality of pixels, each pixel including a plurality of sub-pixels. The manufacturing method includes: preparing a first substrate, on which a plurality of first pads disposed among the plurality of sub-pixels and a common pad shared by the plurality of sub-pixels are disposed; forming a first electrode layer and a second electrode layer spaced apart from each other on a second substrate; self-aligning a plurality of light-emitting nanorods by applying a direct current to the first electrode layer and the second electrode layer; separating the first electrode layer and the second electrode layer into a plurality of first electrodes and a second electrode, respectively, corresponding to the plurality of sub-pixels; and bonding the first substrate and the second substrate by connecting the plurality of first pads and the plurality of first electrodes, and connecting the common pad and the second electrode. The plurality of light-emitting nanorods are connected to a plurality of protrusions of the first electrode layer and / or the second electrode layer and are self-aligned.

[0149] The multiple sub-pixels may include a first sub-pixel, a second sub-pixel, and a third sub-pixel. The multiple luminescent nanorods may include a first luminescent nanorod, a second luminescent nanorod, and a third luminescent nanorod. Self-alignment of the multiple luminescent nanorods may include aligning the first luminescent nanorods by injecting a solution of the first luminescent nanorod into the opening regions on the first and second electrode layers corresponding to the first sub-pixel; aligning the second luminescent nanorods by injecting a solution of the second luminescent nanorod into the opening regions on the first and second electrode layers corresponding to the second sub-pixel; and aligning the third luminescent nanorods by injecting a solution of the third luminescent nanorod into the opening regions on the first and second electrode layers corresponding to the third sub-pixel. The first, second, and third luminescent nanorod solutions can be prepared by mixing multiple first, second, and third luminescent nanorods, respectively, in a solvent. The solvent may include any one of acetone, water, alcohol, and toluene.

[0150] Each of the plurality of first electrodes may include a first portion and a pair of second portions extending from one side and the other side of the first portion, respectively. The second electrodes may include a wire electrode and a plurality of branch electrodes extending from the wire electrode toward the plurality of first electrodes. Each of the plurality of branch electrodes may be disposed between the pair of second portions.

[0151] The plurality of protrusions includes a plurality of first protrusions protruding from a pair of second portions toward a plurality of branch electrodes; and a plurality of second protrusions protruding from the plurality of branch electrodes toward a pair of second portions.

[0152] Multiple subpixels can include blue subpixels, green subpixels, and red subpixels. The number of luminescent nanorods set in the red subpixel can be greater than the number of luminescent nanorods set in the blue and green subpixels.

[0153] Although exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and may be implemented in many different forms without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments of the present disclosure are provided for illustrative purposes only and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Therefore, it should be understood that the above exemplary embodiments are illustrative in all respects and do not limit the present disclosure. The scope of protection of the present disclosure should be interpreted based on the following claims, and all technical concepts within the equivalent scope thereto should be understood to fall within the scope of the present disclosure.

Claims

1. A display device having a plurality of pixels, each pixel comprising a plurality of sub-pixels, the display device comprising: First substrate; Multiple first pads are disposed on the first substrate and located within the multiple sub-pixels; A common pad is disposed on the first substrate and shared by the plurality of sub-pixels; A second substrate is disposed facing the first substrate; A plurality of first electrodes are disposed on the lower surface of the second substrate and are connected to the plurality of first pads; A second electrode is disposed on the lower surface of the second substrate and is connected to the common pad; and Multiple luminescent nanorods, each having one end and the other end respectively connected to the multiple first electrodes and second electrodes. Wherein, the plurality of first electrodes and / or second electrodes include a plurality of protrusions connected to the plurality of luminescent nanorods; and In the cross-sectional view of the display device, the upper surfaces of the first electrode, the second electrode, and the luminescent nanorod are arranged in the same plane.

2. The display device according to claim 1, wherein, Each of the plurality of first electrodes includes a first portion and a pair of second portions extending from one end and the other end of the first portion. The second electrode includes a line electrode and a plurality of branch electrodes extending from the line electrode toward the plurality of first electrodes. Each of the plurality of branch electrodes is disposed between the pair of second portions.

3. The display device according to claim 2, wherein, The plurality of first electrodes includes the plurality of protrusions. The plurality of protrusions extend from the pair of second portions toward the plurality of branch electrodes.

4. The display device according to claim 3, wherein, The plurality of protrusions are formed to narrow in width from the pair of second portions toward the plurality of branch electrodes.

5. The display device according to claim 2, wherein, The second electrode includes the plurality of protrusions. The plurality of protrusions extend from the plurality of branch electrodes toward the pair of second portions.

6. The display device according to claim 5, wherein, The plurality of protrusions are formed to narrow in width from the plurality of branch electrodes toward the pair of second portions.

7. The display device according to claim 2, wherein, The plurality of protrusions includes: Multiple first protrusions protrude from the pair of second portions toward the multiple branch electrodes; and Multiple second protrusions protrude from the multiple branch electrodes toward the pair of second portions.

8. The display device according to claim 7, wherein, The plurality of first protrusions and the plurality of second protrusions are arranged to be symmetrical about each other with respect to an imaginary straight line parallel to the plurality of branch electrodes or the pair of second portions.

9. The display device according to claim 7, wherein, The plurality of first protrusions and the plurality of second protrusions are configured to be offset from each other based on an imaginary straight line parallel to the plurality of branch electrodes or the pair of second portions.

10. The display device according to claim 1, wherein, The protrusions connected to the ends of the plurality of luminescent nanorods have a pointed or rounded shape.

11. The display device according to claim 1, wherein, The plurality of sub-pixels includes blue sub-pixels, green sub-pixels, and red sub-pixels. The number of light-emitting nanorods disposed in the red sub-pixel is greater than the number of light-emitting nanorods disposed in the blue sub-pixel and the green sub-pixel.

12. The display device according to claim 1, wherein, The display device further includes: a plurality of dummy electrodes disposed on the second substrate to correspond to the exterior of the plurality of pixels and spaced apart from the plurality of first electrodes and the second electrodes.

13. A display device having a plurality of pixels, each pixel comprising a plurality of sub-pixels, the display device comprising: The first and second substrates facing each other; Multiple first pads are disposed on the first substrate and located within the multiple sub-pixels; A common pad is disposed on the first substrate and shared by the plurality of sub-pixels; A plurality of first electrodes are disposed on the lower surface of the second substrate and located within the plurality of sub-pixels; The second electrode is disposed on the lower surface of the second substrate and is shared by the plurality of sub-pixels; Multiple light-emitting nanorods are disposed on the second substrate, located within the multiple sub-pixels, and in contact with the multiple first electrodes and the second electrodes; and An adhesive pattern that connects the plurality of first pads and the plurality of first electrodes, and connects the common pad and the second electrode. Wherein, the plurality of first electrodes and / or second electrodes include a plurality of protrusions connected to the plurality of luminescent nanorods; and In the cross-sectional view of the display device, the upper surfaces of the first electrode, the second electrode, and the luminescent nanorod are arranged in the same plane.

14. The display device according to claim 13, wherein, Each of the plurality of first electrodes includes a first portion and a pair of second portions extending from both ends of the first portion. The second electrode includes a line electrode and a plurality of branch electrodes extending from the line electrode toward the plurality of first electrodes. The plurality of branch electrodes are surrounded by the plurality of first electrodes.

15. The display device according to claim 14, wherein, The plurality of protrusions includes: Multiple first protrusions protrude from the pair of second portions toward the multiple branch electrodes; and Multiple second protrusions protrude from the multiple branch electrodes toward the pair of second portions.

16. The display device according to claim 13, wherein, The plurality of sub-pixels includes blue sub-pixels, green sub-pixels, and red sub-pixels. The number of light-emitting nanorods disposed in the red sub-pixel is greater than the number of light-emitting nanorods disposed in the blue sub-pixel and the green sub-pixel.

17. A method of manufacturing a display device, the display device having a plurality of pixels, each pixel comprising a plurality of sub-pixels, the method comprising: A first substrate is prepared, on which a plurality of first pads disposed in the plurality of sub-pixels and a common pad shared by the plurality of sub-pixels are disposed. A first electrode layer and a second electrode layer spaced apart from each other are formed on the second substrate; Multiple luminescent nanorods are aligned by applying a direct current to the first electrode layer and the second electrode layer; The first electrode layer and the second electrode layer are respectively separated into a plurality of first electrodes and a plurality of second electrodes, thereby corresponding to the plurality of sub-pixels; and The first substrate and the second substrate are joined by connecting the plurality of first pads and the plurality of first electrodes, and by connecting the common pad and the second electrode. The plurality of luminescent nanorods are connected to a plurality of protrusions in the first electrode layer and / or the second electrode layer and are self-aligned.

18. The method according to claim 17, wherein, The plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel; The plurality of luminescent nanorods includes a first luminescent nanorod, a second luminescent nanorod, and a third luminescent nanorod. The self-alignment of the plurality of luminescent nanorods includes: The first luminescent nanorod solution is injected into the opening regions corresponding to the first sub-pixel on the first electrode layer and the second electrode layer to align the first luminescent nanorod. By injecting a second luminescent nanorod solution into the opening regions corresponding to the second sub-pixel on the first and second electrode layers, the second luminescent nanorod is aligned; and The third luminescent nanorod solution is injected into the opening regions corresponding to the third sub-pixel on the first and second electrode layers to align the third luminescent nanorod.

19. The method of claim 17, wherein, Each of the plurality of first electrodes includes a first portion and a pair of second portions extending from one side and the other side of the first portion, respectively. The second electrode includes a line electrode and a plurality of branch electrodes extending from the line electrode toward the plurality of first electrodes. Each of the plurality of branch electrodes is disposed between the pair of second portions.

20. The method according to claim 19, wherein, The plurality of protrusions includes: Multiple first protrusions protrude from the pair of second portions toward the multiple branch electrodes; and Multiple second protrusions protrude from the multiple branch electrodes toward the pair of second portions.

21. The method according to claim 17, wherein, The plurality of sub-pixels includes blue sub-pixels, green sub-pixels, and red sub-pixels. The number of light-emitting nanorods disposed in the red sub-pixel is greater than the number of light-emitting nanorods disposed in the blue sub-pixel and the green sub-pixel.

22. The method according to claim 18, wherein, The first luminescent nanorod solution, the second luminescent nanorod solution, and the third luminescent nanorod solution are prepared by mixing the plurality of first luminescent nanorods, the plurality of second luminescent nanorods, and the plurality of third luminescent nanorods in a solvent, respectively, wherein the solvent includes any one of acetone, water, alcohol, and toluene.

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