JP2020091469A - Optical member and display device including the same - Google Patents

Abstract

To provide an optical member that is reduced in thickness and has improved reliability, and a display device including the same.SOLUTION: An optical member of the present invention comprises: a base substrate; a quantum dot layer that is arranged on the base substrate, and includes a medium layer including a first top face having wrinkles and a plurality of quantum dots dispersed in the medium layer; a lower barrier layer that is arranged between the base substrate and the quantum dot layer; and an upper barrier layer that covers the wrinkles in the first top face of the quantum dot layer. The upper barrier layer has a second top face that includes wrinkles corresponding to the wrinkles in the first top face.SELECTED DRAWING: Figure 1

Description

The present invention relates to an optical member and a display device including the same, and more particularly, to an optical member having improved reliability and a display device including the same.

The display device includes a self-luminous display device, a reflective display device, and a transmissive display device. The reflective display device includes a display panel for changing light transmittance and a backlight unit for supplying light to the display panel. The display panel displays an image by adjusting the transmittance of light supplied from the backlight unit.

Meanwhile, various types of optical members have been added to the backlight unit in order to increase light efficiency and color reproducibility. Recently, there is an increasing demand for a thin display device as well as excellent optical characteristics, and various optical members are added to improve the display quality of the display device.

Korean Published Patent No. 10-2013-0120486 Korean Published Patent No. 10-2016-0089695 Korean Patent Registration No. 10-1725023 U.S. Pat. No. 9,199,842 U.S. Pat. No. 9,778,409

The present invention has been made in view of the above prior art, and an object of the present invention is to provide an optical member that is thin and has improved reliability, and a display device including the optical member.

An optical member according to an aspect of the present invention made to achieve the above object includes a medium layer and a medium layer including a base substrate and a first upper surface disposed on the base substrate and having a wrinkle. A quantum dot layer including a plurality of quantum dots dispersed in a lower barrier layer, a lower barrier layer disposed between the base substrate and the quantum dot layer, and an upper barrier covering a wrinkle on a first upper surface of the quantum dot layer. A layer, the upper barrier layer having a second upper surface that includes a wrinkle corresponding to the wrinkle of the first upper surface.

The upper barrier layer may have a uniform thickness on the base substrate.
The quantum dot layers may have different thicknesses on the base substrate.
The upper barrier layer may include an inorganic film.
A plurality of the wrinkles may be provided, and at least one of the plurality of wrinkles may have a curved shape on a plane.
At least two wrinkles of the plurality of wrinkles may be connected to each other.
The curved shape may include a closed curved shape.
The plurality of wrinkles may include a first wrinkle having a first closed curve shape and a second wrinkle having a second closed curve shape, and the first closed curve shape and the second closed curve shape may be different from each other.
The first wrinkle and the second wrinkle may be connected to each other.
The vertical thickness of each of the plurality of wrinkles may be within 1 μm.
The distance between the plurality of wrinkles may be 100 μm or less.
The optical member may further include a low refractive index layer disposed between the base substrate and the lower barrier layer and having a refractive index of 1.5 or less.
The base substrate may include a glass substrate.
The optical member may further include a protective layer disposed on the upper barrier layer and including an organic material, and the protective layer may have a flat upper surface that covers the second upper surface.

A display device according to an aspect of the present invention made to achieve the above object includes a light source for generating light, an optical member including an incident surface facing the light source, and a plurality of pixels arranged on the optical member. And a display panel including the optical member, wherein the optical member includes an upper surface facing the display panel, a lower surface facing the upper surface, and a plurality of side surfaces connecting the upper surface and the lower surface, and the incident surface is the side surface. A base substrate that is at least one of the following, a lower barrier layer that is disposed on the base substrate and includes a flat upper surface, and a lower barrier layer that is disposed on the lower barrier layer and that is lower than the upper surface of the lower barrier layer. An upper barrier layer including an upper surface having a plurality of wrinkles that are non-uniform, a medium layer, and a plurality of quantums dispersed in the medium layer and disposed between the lower barrier layer and the upper barrier layer. A dot layer, and the wrinkle has a curved shape on a plane.

The wrinkle includes a first wrinkle having a first shape on a plane and a second wrinkle having a second shape on a plane, and the first shape and the second shape may be different from each other.
The first wrinkle and the second wrinkle may be connected to each other.
An upper surface of the medium layer may have a wrinkle shape as compared with an upper surface of the base substrate.
The medium layer may have a non-uniform thickness on the base substrate, and the upper barrier layer may have a uniform thickness on the base substrate.
The upper barrier layer may include an inorganic film.
The base substrate may include a glass substrate.
The display device may further include a low refractive layer disposed between the base substrate and the quantum dot layer and having a refractive index of less than 1.5.
The display device may further include a protective layer disposed on the upper barrier layer and covering an upper surface of the upper barrier layer, and the protective layer may have a flat upper surface as compared to an upper surface of the protective layer.
The display panel may be bent around an axis extending along one direction.

According to the present invention, by forming a wrinkle in the inorganic barrier layer that covers the quantum dot layer, it is possible to prevent the inorganic barrier layer from being damaged even if the quantum dot layer is deformed due to temperature or external impact. This improves the reliability of the optical member.

FIG. 3 is an exploded perspective view of a display device according to an exemplary embodiment of the present invention. FIG. 3 is a cross-sectional view showing some components of the display device shown in FIG. 1. FIG. 3 is a cross-sectional view schematically showing an example of a backlight unit according to an embodiment of the present invention. FIG. 6 is a cross-sectional view schematically showing another example of the backlight unit according to the embodiment of the present invention. FIG. 3 is an exploded perspective view of an optical member according to an exemplary embodiment of the present invention. FIG. 6 is a cross-sectional view showing a part of an example of an optical member according to an embodiment of the present invention. 3 is a photograph showing a part of an example of an optical member according to an embodiment of the present invention. It is sectional drawing which shows some other examples of the optical member by one Embodiment of this invention. It is sectional drawing which shows some other examples of the optical member by one Embodiment of this invention. FIG. 6 is a cross-sectional view of an optical member according to an exemplary embodiment. FIG. 6 is a cross-sectional view of an optical member according to an exemplary embodiment. FIG. 6 is a cross-sectional view of an optical member according to an exemplary embodiment. FIG. 6 is a cross-sectional view showing an example of a method for manufacturing an optical member according to an embodiment of the present invention. FIG. 6 is a cross-sectional view showing an example of a method for manufacturing an optical member according to an embodiment of the present invention. FIG. 6 is a cross-sectional view showing an example of a method for manufacturing an optical member according to an embodiment of the present invention. FIG. 6 is a cross-sectional view showing an example of a method for manufacturing an optical member according to an embodiment of the present invention. FIG. 6 is a cross-sectional view showing an example of a method for manufacturing an optical member according to an embodiment of the present invention. FIG. 7 is a cross-sectional view showing another example of the method for manufacturing the optical member according to the embodiment of the present invention. FIG. 7 is a cross-sectional view showing another example of the method for manufacturing the optical member according to the embodiment of the present invention. FIG. 7 is a cross-sectional view showing another example of the method for manufacturing the optical member according to the embodiment of the present invention. FIG. 7 is a cross-sectional view showing another example of the method for manufacturing the optical member according to the embodiment of the present invention. FIG. 6 is an exploded perspective view of a display device according to another exemplary embodiment of the present invention. FIG. 6 is a cross-sectional view showing a method of manufacturing an optical member according to another embodiment of the present invention. FIG. 6 is a cross-sectional view showing a method of manufacturing an optical member according to another embodiment of the present invention. FIG. 6 is a cross-sectional view showing a method of manufacturing an optical member according to another embodiment of the present invention. FIG. 6 is a cross-sectional view showing a method of manufacturing an optical member according to another embodiment of the present invention.

As used herein, when a component (or region, layer, portion, etc.) is referred to as being "on," "coupled with," or "coupled" to another component, it refers to another component. Means that the third component may be placed/connected/coupled directly to or between them.

The same reference numerals refer to the same components. In addition, in the drawings, thicknesses, ratios, and dimensions of components are exaggerated for effective description of technical contents.

“And/or” includes all one or more combinations in which the relevant configurations can be defined.

The terms first, second, etc. are used to describe various components, but the components should not be limited by the terms. The term is used only to distinguish one component from another. For example, without departing from the scope of the present invention, the first component is named as the second component, and the second component is similarly named as the first component. A singular expression includes plural expressions unless the context clearly dictates otherwise.

Also, terms such as "below", "below", "above", "above" are used to describe the interrelationship of the components shown in the drawings. The terms are relative concepts and will be described based on the directions shown in the drawings.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. .. Also, terms such as those defined in commonly used dictionaries should be construed to have the meaning consistent with the meaning in the context of the relevant art, and not to be interpreted as ideal or overly formal. As long as it is explicitly defined here.

The term "comprising" or "having", and the like is intended to specify that there are features, numbers, steps, acts, components, parts, or combinations thereof described in the specification. It should be understood that the possibility of the presence or addition of one or more other features, numbers, steps, acts, components, parts, or combinations thereof is not precluded in advance.

Hereinafter, a specific example of a mode for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of a display device according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view showing a partial configuration of the display device shown in FIG. FIG. 3A is a sectional view schematically showing an example of a backlight unit according to an exemplary embodiment of the present invention. FIG. 3B is a sectional view schematically showing another example of the backlight unit according to the embodiment. Hereinafter, the present invention will be described with reference to FIGS. 1 to 3B.

As shown in FIG. 1, the display device DA includes a display panel 100, a backlight unit BLU, an upper protection member 410, a lower protection member 420, and an optical film 500. The backlight unit BLU includes a light source 200 and an optical member 300.

The display panel 100 receives an electric signal and displays an image. The user receives information through the image provided by the display panel 100 of the display device DA. The display panel 100 includes a display surface IS parallel to a plane defined by the first direction DR1 and the second direction DR2. The display surface IS is divided into an active area AA and a peripheral area NAA. The display panel 100 displays an image in the active area AA in the third direction DR3. The active area AA is an area activated based on an electric signal. The display panel 100 includes a plurality of pixels PX arranged in the active area AA.

The peripheral area NAA is adjacent to the active area AA. In the present embodiment, the peripheral area NAA surrounds the active area AA. Various drive circuits that provide electric signals to the pixels PX and pads for receiving electric signals from the outside are arranged in the peripheral area NAA.

FIG. 2 shows an example of the display panel area in which one pixel PX is arranged in the display panel 100. Hereinafter, the display panel 100 will be described with reference to FIG.

The display panel 100 includes a first substrate 110, a second substrate 120, and a liquid crystal layer LCL. The first substrate 110 includes a first base layer S1, a pixel PX, and a plurality of insulating layers (10, 20, 30). In the present embodiment, the insulating layers (10, 20, 30) are represented by the first insulating layer 10, the second insulating layer 20, and the third insulating layer 30 that are sequentially stacked along the third direction DR3.

The first base layer S1 includes an insulating material. For example, the first base layer S1 includes glass or plastic.

The pixel PX includes a thin film transistor TR and a pixel electrode PE. The thin film transistor TR includes a semiconductor pattern AL, a control electrode CE, an input electrode IE, and an output electrode OE. The semiconductor pattern AL is arranged between the first base layer S1 and the first insulating layer 10. The semiconductor pattern AL contains a semiconductor material. For example, the semiconductor material includes at least one of amorphous silicon, polycrystalline silicon, single crystal silicon, an oxide semiconductor, and a compound semiconductor. Furthermore, the pixel PX includes a plurality of thin film transistors, and each of the thin film transistors includes the same or different semiconductor material, but is not limited to any one embodiment.

The control electrode CE is arranged between the first insulating layer 10 and the second insulating layer 20. The control electrode CE is arranged apart from the semiconductor pattern AL with the first insulating layer 10 interposed therebetween.

The input electrode IE and the output electrode OE are arranged between the second insulating layer 20 and the third insulating layer 30. The input electrode IE and the output electrode OE are arranged apart from each other. Each of the input electrode IE and the output electrode OE penetrates the first insulating layer 10 and the second insulating layer 20 and is connected to the semiconductor pattern AL.

The pixel electrode PE is connected to the thin film transistor TR. The pixel electrode PE constitutes a liquid crystal capacitor C _LC together with the common electrode CME and the liquid crystal layer LCL. The liquid crystal capacitor C _LC controls the orientation of the liquid crystal layer LCL by the electric field formed between the pixel electrode PE and the common electrode CME to control the transmittance of the liquid crystal layer LCL. The pixel PX displays light corresponding to the transmittance of the liquid crystal layer LCL.

The pixel electrode PE is arranged on the third insulating layer 30. The pixel electrode PE penetrates the third insulating layer 30 and is connected to the thin film transistor TR. A gate signal of the electric signal is transmitted to the control electrode CE to turn on the thin film transistor TR, and a data signal of the electric signal is transmitted to the output electrode OE and then to the pixel electrode PE after being received through the input electrode IE. Provided.

The second substrate 120 includes a second base layer S2, a color filter layer CF, an overcoat layer CC, and a common electrode CME. The second base layer S2 includes an insulating material. The second base layer S2 includes, for example, glass or plastic.

The second base layer S2 includes a back surface facing the first base layer S1 and a front surface facing the back surface. The front surface is the surface on which the display surface IS (see FIG. 1) is provided. The color filter layer CF and the common electrode CME are arranged on the back surface of the second base layer S2.

The color filter layer CF includes a black matrix BM and a color pattern CP. The black matrix BM blocks light that enters the black matrix BM. The black matrix BM partitions a pixel area in which light is displayed, covers the periphery of the pixel area, and prevents light from leaking to the periphery of the pixel area.

The color pattern CP is arranged adjacent to the black matrix BM. The color pattern CP is superimposed on the pixel electrode PE of the pixel PX. A plurality of color patterns CP are provided and arranged in each of the pixel regions. Each of the pixel regions is a region controlled by the liquid crystal capacitor CLC and is a region corresponding to the pixel electrode PE.

The color pattern CP emits light incident on the color pattern CP in a predetermined color. The color pattern CP includes at least one of a dye, a pigment, an organic phosphor, and an inorganic phosphor. In the display panel 100 according to the present embodiment, the color filter layer CF may be disposed on the first base layer S1 to form the first substrate 110. Alternatively, the color filter layer CF may be omitted. The color filter layer CF according to the present embodiment is provided in various forms and is not limited to any one embodiment.

The overcoat layer CC covers the color filter layer CF. The overcoat layer CC contains an insulating material. The overcoat layer CC covers the back surface of the color filter layer CF and provides a flat surface for the common electrode CME. Meanwhile, in the display panel 100 according to the present embodiment, the overcoat layer CC may be omitted.

The common electrode CME forms an electric field with the pixel electrode PE. In the present embodiment, the common electrode CME is provided on the back surface of the second base layer S2 and is provided in an integral shape that overlaps a plurality of pixels. However, this is shown as an example, and the common electrode CME may be provided in a plurality of patterns and provided for each pixel region. In addition, the common electrode CME may be disposed on the first base layer S1 to form the first substrate 110. On the other hand, in the present embodiment, the pixel electrode PE has a shape in which a slit or the like is not formed. However, in the display panel 100 according to the present embodiment, at least one of the common electrode CME and the pixel electrode PE is a plurality of electrodes. It can also have a shape that includes slits.

The liquid crystal layer LCL includes liquid crystal molecules (not shown). The liquid crystal molecules are directional particles, and their alignment is adjusted according to the electric field formed between the pixel electrode PE and the common electrode CME. The transmittance of the liquid crystal layer LCL is substantially controlled by the alignment of liquid crystal molecules.

FIG. 3A shows a cross-sectional view of an example of the backlight unit BLU shown in FIG. 1, and FIG. 3B shows another example of the backlight unit BLU-1 according to an embodiment of the present invention in which a part of the configuration is added. The cross-sectional view of the example of FIG. Hereinafter, the backlight unit BLU will be described with reference to FIGS. 1 and 3A.

The backlight unit BLU provides light to the display panel 100. The display panel 100 implements an image by controlling the transmittance of each pixel PX based on the provided light. In this embodiment, the display panel 100 is a light transmissive display panel.

The light source 200 generates light and provides the light to one side of the optical member 300. The light source 200 includes a circuit board 210 and a plurality of light emitting elements 220. The circuit board 210 is provided in a plate shape having a length extended along the first direction DR1 and a width extended along the third direction DR3. Although not shown, the circuit board 210 includes an insulating substrate and circuit wiring mounted on the insulating substrate. The circuit wiring receives an electric signal from the outside and transmits the electric signal to the light emitting element or electrically connects the light emitting element 220.

Each of the light emitting elements 220 produces light. The light emitting device 220 is disposed on the circuit board 210 and electrically connected to the circuit board 210. The light emitting devices 220 are spaced apart from each other along the length direction of the circuit board 210. In the present embodiment, the light emitting devices 220 are illustrated as arranged in a line along the first direction DR1.

The optical member 300 has a plate shape parallel to the display panel 100. The upper surface 300-S of the optical member 300 is a surface facing the display panel 100.

The optical member 300 receives light from the light source 200 and provides the light to the display panel 100. The optical member 300 controls a path of light emitted from the light source 200 so that the light is provided on the front surface of the display panel 100.

The optical member 300 according to the present embodiment converts incident light into white light. Accordingly, even if the light source 200 generates a color that is not white, for example, blue light, the display panel 100 may receive white light through the optical member 300. The optical member 300 functions as a light guide plate and a light conversion member. According to the present invention, the light guide plate and the light converting member may be replaced by the single optical member 300, the thickness of the display device DA may be reduced, and the assembly process of the display device DA may be simplified.

The optical member 300 includes a base substrate 310 and a quantum dot unit 320. The base substrate 310 includes an incident surface (SF1) facing the light source 200. In the present embodiment, the incident surface (SF1) is defined on any one of the side surfaces of the base substrate 310. However, this is shown as an example, and the incident surface (SF1) may be defined on a plurality of side surfaces.

The base substrate 310 includes an insulating material. For example, the base substrate 310 includes glass.

The base substrate 310 guides the light received through the incident surface (SF1) and emits the light toward the upper surface of the base substrate 310. The optical path toward the second direction DR2 is changed to the third direction DR3 by the base substrate 310. The light guiding function of the optical member 300 is substantially performed by the base substrate 310.

The quantum dot unit 320 is arranged on the base substrate 310. The quantum dot unit 320 includes a quantum dot layer (QDL) 321, a lower barrier layer (LBL) 322, and an upper barrier layer (UBL) 323. The quantum dot layer 321 includes a plurality of quantum dots (not shown). The quantum dot layer 321 changes the wavelength of light incident on the quantum dot layer 321.

The lower barrier layer 322 and the upper barrier layer 323 seal the quantum dot layer 321. The lower barrier layer 322 is disposed between the quantum dot layer 321 and the base substrate 310 and is disposed below the quantum dot layer 321 to protect the quantum dot layer 321 and prevent external moisture or moisture from penetrating. To do. The upper barrier layer 323 is disposed on the quantum dot layer 321, and covers the upper surface of the quantum dot layer 321. The upper barrier layer 323 protects the quantum dot layer 321 by a configuration arranged on the quantum dot layer 321, and prevents external moisture and water from permeating.

Each of the lower barrier layer 322 and the upper barrier layer 323 contains an inorganic substance. For example, each of the lower barrier layer 322 and the upper barrier layer 323 includes a metal oxide or a metal nitride. For example, each of the lower barrier layer 322 and the upper barrier layer 323 includes silicon oxide, silicon nitride, silicon oxynitride, titanium oxide, or a combination thereof. However, this is described as an example, and the lower barrier layer 322 and the upper barrier layer 323 may include various substances as long as they are inorganic substances capable of sealing the quantum dot layer 321. It is not limited to one embodiment. On the other hand, the lower barrier layer 322 and the upper barrier layer 323 are formed independently. Accordingly, the lower barrier layer 322 and the upper barrier layer 323 are formed of the same material or different materials.

In this embodiment, the side surface of the quantum dot layer 321 is shown as exposed from the lower barrier layer 322 and the upper barrier layer 323. However, this is shown as an example, and in the optical member 300 according to the present embodiment, the side surface of the quantum dot layer 321 may be covered by the lower barrier layer 322 and the upper barrier layer 323 and not exposed to the outside. ..

Meanwhile, referring to FIG. 3B, the backlight unit BLU-1 further includes a low refractive index layer 330. The low refractive index layer 330 is disposed between the base substrate 310 and the quantum dot unit 320. The low refractive index layer 330 covers the upper surface of the base substrate 310.

The low refractive index layer 330 has a lower refractive index than the base substrate 310. For example, the low refractive index layer 330 has a refractive index of less than 1.5. The low refractive index layer 330 improves the light guiding function of the base substrate 310.

Referring back to FIG. 1, the upper protection member 410 is disposed on the display panel 100 to cover the display panel 100. The upper protection member 410 includes a predetermined opening 410-OP that exposes at least a part of the display panel 100. The opening 410-OP exposes at least the active area AA of the display panel 100. The image displayed in the active area AA is visible to the outside through the opening 410-OP. Meanwhile, the display device DA according to the present embodiment further includes a transparent protection member disposed in the opening 410-OP. In addition, the upper protection member 410 according to the present embodiment is optically transparent. At this time, the opening 410-OP may be omitted.

The lower protection member 420 is combined with the upper protection member 410 to protect the display panel 100 and the backlight unit BLU. The lower protection member 420 includes a bottom portion 420-B and a side wall portion 420-W. The bottom portion 420-B has an area equal to or larger than the areas of the display panel 100 and the optical member 300. The side wall portion 420-W is connected to the bottom portion 420-B and bent from the bottom portion 420-B in the third direction DR3. The bottom portion 420-B and the side wall portion 420-W define a predetermined internal space 420-SS. The display panel 100 and the backlight unit BLU are housed in the internal space 420-SS and protected from an external impact.

The optical film 500 is disposed between the display panel 100 and the optical member 300. The optical film 500 may improve the efficiency of light emitted from the optical member 300 to the display panel 100 or may improve the uniformity of light so that the light may reach the front surface of the display panel 100 uniformly. .. The optical film 500 includes a single sheet or a plurality of sheets. For example, the optical film 500 includes at least one of a lenticular sheet, a prism sheet, and a scattering sheet. Meanwhile, in the display device DA according to the present embodiment, the optical film 500 may be omitted.

FIG. 4 is an exploded perspective view of an optical member according to an exemplary embodiment of the present invention. FIG. 5A is a cross-sectional view showing a part of an optical member according to an embodiment of the present invention. FIG. 5B is a photograph showing a part of an optical member according to an embodiment of the present invention. In FIG. 4, the base substrate 310 and the quantum dot unit 320 are shown separately for ease of explanation. FIG. 5A shows one region of the quantum dot unit 320 of the configuration shown in FIG. Hereinafter, the present invention will be described with reference to FIGS. 4 to 5B.

The base substrate 310 includes an upper surface SF-U, a lower surface SF-L, and a plurality of side surfaces (SF1, SF2, SF3, SF4). The upper surface SF-U is a surface facing the display panel 100 (see FIG. 1 ). The quantum dot unit 320 is arranged on the upper surface SF-U. The lower surface SF-L faces the upper surface SF-U. The lower surface SF-L is a surface facing the bottom portion 420-B (see FIG. 1) of the lower protection member 420 (see FIG. 1).

The side surfaces (SF1, SF2, SF3, SF4) include a first side surface SF1, a second side surface SF2, a third side surface SF3, and a fourth side surface SF4. Each of the first side surface SF1 and the second side surface SF2 is parallel to the plane defined by the first direction DR1 and the third direction DR3 and faces each other in the second direction DR2. The third side surface SF3 and the fourth side surface SF4 are parallel to a plane defined by the second direction DR2 and the third direction DR3 and face each other in the first direction DR1.

As described above, at least one of the side surfaces (SF1, SF2, SF3, SF4) is the incident surface facing the light source 200 (see FIG. 1). In the present embodiment, the incident surface is defined by the first side surface SF1.

The quantum dot unit 320 includes a lower barrier layer 322, a quantum dot layer 321, and an upper barrier layer 323, which are stacked along the third direction DR3. The lower barrier layer 322 is disposed on the base substrate 310. The upper surface 322-S of the lower barrier layer 322 (hereinafter, the upper surface of the lower barrier layer) has a shape corresponding to the upper surface of the base substrate 310 arranged below. In this embodiment, the upper surface 322-S of the lower barrier layer is flat compared to the upper surface 323-S of the upper barrier layer.

The quantum dot layer 321 includes a medium layer MX, a plurality of quantum dots (PT1, PT2), and scattering particles SP. The quantum dots (PT1, PT2) and the scattering particles SP are dispersed in the medium layer MX.

The medium layer MX is made of various resin compositions generally called a binder. For example, the medium layer MX is a polymer resin. For example, the medium layer MX is an acrylic resin, a urethane resin, a silicon resin, an epoxy resin, or the like. The medium layer MX is an optically transparent transparent resin. However, the medium layer MX is not limited to this, as long as it is a medium in which the quantum dots (PT1, PT2) can be dispersed and arranged in the present specification, regardless of the name, additional other functions, constituent materials, or the like. Can be called.

The quantum dots (PT1, PT2) convert the wavelength of light incident on the quantum dots (PT1, PT2). Each of the quantum dots (PT1, PT2) is a substance having a crystal structure with a size of several nanometers, is composed of several hundreds to several thousands of atoms, and has a small size. Therefore, the energy band gap (band gap) is large. ) Shows a quantum confinement effect. When light having a wavelength higher than the band gap is incident on each of the quantum dots (PT1, PT2), each of the quantum dots (PT1, PT2) absorbs the light and enters an excited state. It emits light of the wavelength of and falls to the ground state. The wavelength of the emitted light has a value corresponding to the bandgap. By adjusting the size and composition of each of the quantum dots (PT1, PT2), the emission characteristics due to the quantum confinement effect can be adjusted, whereby the quantum dots (PT1, PT2) are converted and emitted. The wavelength of the emitted light is controlled.

Each of the quantum dots (PT1, PT2) is selected from II-VI group compounds, III-V group compounds, IV-VI group compounds, IV group elements, IV group compounds, and combinations thereof.

The II-VI group compound includes CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and a two-element compound of the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe. , ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnS, Sg, CdS, CdZn, Sg, Sg, Sd, HgZn, Sg, Sd, HgZnS, CgZn, Sg, Sd, HgZn, Sd, Sg, Sd, Sg, Sd, Sg, Sd, Sg, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, Sd, and Sd, and Sd, Sd, Sd, and Sd, and Sd, and S and S and S and S, and S and S and C and S and S, and a mixture of these elements. CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof.

The III-V group compound is a two-element compound of the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof, GaNP, GaNAs, GaNSb, GaPAs. , GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and ternary compounds of mixtures thereof, as well as GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and a mixture of these four element compounds. Group IV-VI compounds are two-element compounds of the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSnSbPnSb. It is selected from the group consisting of these three-element compounds and the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and the group consisting of these four-element compounds. The Group IV element is selected from the group consisting of Si, Ge, and a mixture thereof. The Group IV compound is a two-element compound selected from the group consisting of SiC, SiGe, and a mixture thereof.

At this time, the 2-element compound, the 3-element compound, or the 4-element compound exists in the particles at a uniform concentration, or the concentration distribution is partially divided into various states and exists in the same particle.

Each of the quantum dots (PT1, PT2) has a core-shell structure including a core and a shell surrounding the core. Alternatively, one quantum dot has a core/shell structure surrounding another quantum dot. The interface between the core and the shell has a concentration gradient in which the concentration of the element existing in the shell becomes lower toward the center.

Each of the quantum dots (PT1, PT2) is a particle having a size on the nanometer scale. Each of the quantum dots (PT1, PT2) has a full width of half maximum (FWHM) of the emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, more preferably about 30 nm or less, and within this range. Improves color purity and color reproducibility. The light emitted through these quantum dots (PT1, PT2) is emitted in all directions, so that the wide viewing angle is improved.

Further, the morphology of the quantum dots (PT1, PT2) is not particularly limited to those commonly used in the art, and more specifically, spherical, pyramidal, multi-arm, Alternatively, cubic nanoparticles, nanotubes, nanowires, nanofibers, nanoplate-like particles and the like are used.

The quantum dots (PT1, PT2) according to the present embodiment include a first quantum dot PT1 and a second quantum dot PT2. The wavelengths of the light that enters and is emitted from the first quantum dots PT1 and the second quantum dots PT2 are different from each other. However, this is shown as an example. The wavelength of light converted by the quantum dots (PT1, PT2) is in a single wavelength range. In addition, the quantum dots (PT1, PT2) can further include additional quantum dots that convert light of another wavelength. The type and number of quantum dots (PT1, PT2) according to this embodiment are not limited to any one embodiment.

The scattering particles SP include metal oxides having high reflectance such as titanium oxide and silica-based nanoparticles. The scattering particles SP scatter the light emitted from the quantum dots (PT1, PT2) and improve the efficiency of light recycling in the quantum dot unit 320. This improves the efficiency of light emitted from the quantum dot unit 320. However, this is shown as an example, and the scattering particles SP may be omitted in the quantum dot unit 320 according to the present embodiment.

In the present embodiment, the upper surface 321-S of the quantum dot layer 321 (hereinafter, the upper surface of the QDL (quantum dot layer)) includes a plurality of wrinkles or wrinkle patterns (WRK-Q) (hereinafter, QDL wrinkle). The QDL wrinkle WRK-Q is a part of the upper surface 321-S of the QDL protruding in the third direction DR3 when compared with the plane defined by the first direction DR1 and the second direction DR2. The QDL wrinkle WRK-Q has a thickness of about 1 μm or less when measured in the vertical direction. Therefore, the upper surface 321-S of the QDL is non-uniform compared to the upper surface 322-S of the LBL.

The QDL wrinkle WRK-Q is formed by the residual stress existing during or after the formation of the quantum dot layer (QDL) 321. The wrinkle on the upper surface 321-S of the QDL has the shape of a wrinkle due to the QDL wrinkle WRK-Q. The shape of the QDL wrinkle WRK-Q is substantially reflected and displayed on the upper surface of the upper barrier layer 323. Hereinafter, detailed description will be given later.

The upper barrier layer 323 is disposed on the quantum dot layer (QDL) 321, and directly covers the upper surface 321-S of the quantum dot layer. The upper barrier layer 323 has a substantially uniform thickness on the base substrate 310. For example, on the upper surface 321-S of the quantum dot layer, the thickness T1 of the upper barrier layer 323 in a region overlapping with the QDL wrinkle WRK-Q and the thickness T2 of the upper barrier layer 323 in a region adjacent to the QDL wrinkle WRK-Q. Are substantially the same.

In the present embodiment, the upper surface 323-S of the upper barrier layer 323 (hereinafter, the upper surface of the upper barrier layer) defines the upper surface 300-S (see FIG. 1) of the optical member. The upper surface 323-S of the upper barrier layer has a shape corresponding to the upper surface 321-S of the quantum dot layer arranged below. Accordingly, the upper surface 323-S of the upper barrier layer includes a plurality of wrinkle WRKs corresponding to the QDL wrinkle WRK-Q. The wrinkle WRK is a portion of the upper surface 323-S of the upper barrier layer that protrudes in the third direction DR3 as compared with the plane defined by the first direction DR1 and the second direction DR2. Due to the wrinkle WRK, the upper surface 323-S of the upper barrier layer is non-uniform in cross section as compared with the upper surface SF-U of the base substrate 310. Due to the wrinkle WRK, the upper surface 323-S of the upper barrier layer has the shape of a wrinkle.

FIG. 5B is an enlarged photograph showing a part of the upper surface 323-S of the upper barrier layer. Referring to FIG. 5B, the wrinkles WRK are randomly arranged on the upper surface SF-U of the base substrate 310.

At least one of the wrinkles WRK has a curved shape on a plane. Curve means a line having a bend at least in part, and includes an open curve and a closed curve. In FIG. 5B, reference numerals of the first wrinkle WRK1, the second wrinkle WRK2, and the third wrinkle WRK3 among the wrinkle WRK are shown for ease of explanation.

The first wrinkle WRK1 has a curved shape on a plane. The curved shape of the first wrinkle WRK1 may be an open curved shape. The second wrinkle WRK2 has a curved shape on a plane. The curved shape of the second wrinkle WRK2 may be an open curved shape.

The first wrinkle WRK1 and the second wrinkle WRK2 may have independent shapes. That is, since the curved shape of the first wrinkle WRK1 and the curved shape of the second wrinkle WRK2 are controlled independently of each other, they are the same or different from each other. In the present embodiment, the first wrinkle WRK1 and the second wrinkle WRK2 are shown as having different curved shapes.

The first wrinkle WRK1 and the second wrinkle WRK2 are connected to each other. In the present embodiment, one end of the second wrinkle WRK2 is shown as being connected to a part of the first wrinkle WRK1. However, this is shown as an example, and the connection between the first wrinkle WRK1 and the second wrinkle WRK2 is performed in another place, or the first wrinkle WRK1 and the second wrinkle WRK2 are separated from each other. However, the present invention is not limited to any one embodiment.

The third wrinkle WRK3 is separated from the first wrinkle WRK1 and the second wrinkle WRK2. The third wrinkle WRK3 has a curved shape. The curved shape of the third wrinkle WRK3 may be a closed curved shape.

The wrinkle WRK according to the present embodiment has various shapes on a plane. As described above, some of the wrinkles of the wrinkle may be connected to each other or may be separated from each other. Further, some of the wrinkles of the wrinkle have an open curve shape or a closed curve shape. For example, the distance between the plurality of wrinkles WRK is 100 μm or less.

According to the present invention, the upper barrier layer 323 has a non-uniform upper surface 323-S that includes a plurality of wrinkle WRKs. The wrinkle WRK is formed by substantially reflecting the upper surface 321-S of the quantum dot layer. According to the present invention, by forming the upper barrier layer 323 along the wrinkle (WRK-Q) on the upper surface of the quantum dot layer, even if the quantum dot layer 321 is deformed due to external impact or temperature change, the upper portion. The barrier layer 323 can easily cope with the deformation. This prevents damage to the upper barrier layer 323 such as delamination between the quantum dot layer 321 and the upper barrier layer 323, cracking of the upper barrier layer 323, etc., and improves the reliability of the optical member 300.

FIG. 6A is a cross-sectional view showing a part of another example of the optical member according to the embodiment of the present invention. FIG. 6B is a sectional view showing a part of still another example of the optical member according to the embodiment of the present invention. 6A and 6B are cross-sectional views of a part of a quantum dot unit (320-1, 320-2) according to an exemplary embodiment of the present invention. Hereinafter, the present invention will be described with reference to FIGS. 6A and 6B. On the other hand, the same components as those described with reference to FIGS. 1 to 5B are designated by the same reference numerals and redundant description will be omitted.

As shown in FIG. 6A, the quantum dot unit 320-1 has a lower barrier layer 322-1 including a plurality of layers and an upper barrier layer 323-1 including a plurality of layers. The lower barrier layer 322-1 includes a first lower layer L11 and a second lower layer L21. Each of the first lower layer L11 and the second lower layer L21 contains an inorganic substance. For example, each of the first lower layer L11 and the second lower layer L21 includes metal oxide, silicon oxide, silicon nitride, or a combination thereof. Meanwhile, materials forming the first lower layer L11 and the second lower layer L21 may be the same or different from each other, and are not limited to any one embodiment.

The upper barrier layer 323-1 includes a first upper layer L12 and a second upper layer L22. Each of the first upper layer L12 and the second upper layer L22 contains an inorganic substance. Materials forming the first upper layer L12 and the second upper layer L22 may be the same or different from each other, and are not limited to any one embodiment.

As shown in FIG. 6B, the quantum dot unit 320-2 further includes a cover layer (protective layer) 324 when compared with the quantum dot unit 320 shown in FIG. 5A. The cover layer 324 is disposed on the upper barrier layer 323 and covers the upper surface 323-S of the upper barrier layer to protect the upper barrier layer 323. At this time, the upper surface 300-S (see FIG. 1) of the optical member shown in FIG. 1 corresponds to the upper surface 324-S of the cover layer 324.

The cover layer 324 covers the wrinkle WRK and provides a flat surface on the quantum dot unit 320-2. Thus, in the cover layer 324, the thickness T3 of the portion overlapping the wrinkle WRK and the thickness T4 of the portion adjacent to the wrinkle WRK are different from each other.

The cover layer 324 contains an organic material. The cover layer 324 is optically transparent. This prevents the efficiency of light emitted from the quantum dot unit 320-2 from being reduced by the cover layer 324.

7A to 7C are cross-sectional views of an optical member according to an exemplary embodiment. For ease of explanation, FIGS. 7B and 7C are cross-sectional views when the optical member 300 shown in FIG. 7A is deformed by an external impact or heat. Hereinafter, the present invention will be described with reference to FIGS. 7A to 7C.

As shown in FIG. 7A, the optical member 300 includes a base substrate 310 and a quantum dot unit 320. The upper surface 323-S of the upper barrier layer comprises the wrinkle WRK. The upper barrier layer 323 has a uniform thickness such that the thickness T2 in a region adjacent to the thickness T1 on the wrinkle WRK is substantially the same. The quantum dot layer 321 includes wrinkles on the upper surface 321-S. The quantum dot layer 321 has a nonuniform thickness due to the wrinkle WRK. The wrinkle WRK has a maximum thickness TQ in the defined area.

As shown in FIG. 7B, when the tensile stress TS-I acts on the optical member 300-TS, the shape of the quantum dot layer 321 is deformed. The degree of wrinkles on the upper surface 321-S of the quantum dot layer is reduced, and the maximum thickness TQ1 of the quantum dot layer 321 is reduced compared to the maximum thickness TQ shown in FIG. 7A. The tensile stress TS-I is caused by an external impact or residual stress remaining in the quantum dot layer 321.

As shown in FIG. 7C, when the compressive stress CS-I acts on the optical member 300-CS, the shape of the quantum dot layer 321 is deformed. The degree of wrinkles on the upper surface 321-S of the quantum dot layer increases, and the maximum thickness TQ2 of the quantum dot layer 321 increases compared to the maximum thickness TQ shown in FIG. 7A. The compressive stress CS-I is caused by an external impact or residual stress remaining in the quantum dot layer 321.

According to the present invention, the upper barrier layer 323 is formed to have a uniform thickness along the unevenness of the upper surface 321-S of the quantum dot layer, so that the wrinkle degree of the upper surface 321-S of the quantum dot layer is increased. Even if the value changes, the contact force with the quantum dot layer 321 can be stably maintained. The wrinkle degree of the wrinkles (WRK-T, WRK-C) on the upper surface of the upper barrier layer decreases or increases according to the change of the upper surface 321-S of the quantum dot layer, but the thickness of the upper barrier layer 323 is uniform. 7A, the position of the neutral plane of the upper barrier layer 323 does not change in the optical member 300 of FIG. 7A.

Thereby, the upper barrier layer 323 is stably maintained against the deformation of the upper surface 321-S of the quantum dot layer, and thus the reliability of the optical member 300-TS is improved.

8A to 8B are sectional views showing an example of a method for manufacturing an optical member according to an embodiment of the present invention. 9A to 9D are cross-sectional views showing another example of the method for manufacturing the optical member according to the embodiment of the present invention. 9A to 9C show steps corresponding to FIGS. 8C to 8E. Hereinafter, the present invention will be described with reference to FIGS. 8A to 9C. On the other hand, the same reference numerals are given to the same configurations as the configurations described in FIGS. 1 to 7C, and duplicate description will be omitted.

As shown in FIG. 8A, a base substrate 310 is provided. The base substrate 310 may be a glass substrate. The base substrate 310 is provided such that the upper surface 310-S (hereinafter, the upper surface of the base substrate) faces the upper third direction DR3 (see FIG. 1 ).

Next, as shown in FIG. 8B, a lower barrier layer 322 and a preliminary quantum dot layer 321-I are sequentially formed on the base substrate 310. The lower barrier layer 322 is formed by coating the upper surface 310-S of the base substrate with a mineral. The coating method includes a vapor deposition or printing process.

The preliminary quantum dot layer 321-I is formed after the lower barrier layer 322 is formed. The preliminary quantum dot layer 321-I includes a medium layer MX, a first quantum dot PT1, and a second quantum dot PT2. The preliminary quantum dot layer 321-I is formed by coating the medium layer MX in which the first quantum dots PT1 and the second quantum dots PT2 are dispersed on the lower barrier layer 322.

Then, as shown in FIGS. 8C and 8D, the preliminary quantum dot layer 321-I is cured to form the quantum dot layer 321. As shown in FIG. 8C, the curing of the preliminary quantum dot layers 321-I is performed in a thermal curing process in which thermal HT is provided. The thermal HT is adjusted at various temperatures and times depending on the composition of the preliminary quantum dot layer 321-I, the provided amount, and the thickness of the quantum dot layer 321 to be formed.

As shown in FIG. 8D, a predetermined wrinkle (WRK-Q) (hereinafter, quantum dot layer (QDL) wrinkle) is formed on the upper surface 321-S of the quantum dot layer (QDL) 321 (hereinafter, upper surface of the quantum dot layer QDL). Is formed. After the curing process, the upper surface 321-S of the quantum dot layer QDL has a wrinkle shape as compared with the upper surface 322-S of the lower barrier layer LBL.

The QDL wrinkle WRK-Q is formed by the stress SS applied to the upper surface of the preliminary quantum dot layer 321-I. As the magnitude of the stress SS increases, the wrinkle degree of the QDL wrinkle WRK-Q increases. The larger the wrinkle degree of the QDL wrinkle WRK-Q, the larger the protrusion degree of the QDL wrinkle WRK-Q.

The degree of wrinkle can be adjusted in various ways. For example, the degree of wrinkle varies depending on the physical properties of the preliminary quantum dot layer 321-I. The physical properties of the preliminary quantum dot layer 321-I that affect the degree of wrinkle include the glass transition temperature. The less stable the preliminary quantum dot layer 321-I is to the thermal HT provided in the curing process, the greater the degree of wrinkling.

Further, the degree of wrinkle varies depending on the thickness of the quantum dot layer (QDL) 321. The thicker the quantum dot layer 321 to be formed, the greater the amount of the preliminary quantum dot layer 321-I provided. At this time, the degree of wrinkle increases as the thickness of the quantum dot layer 321 increases.

Further, the degree of wrinkle varies depending on the difference in glass transition temperature between the base substrate 310 and the preliminary quantum dot layer 321-I. The stability against the thermal HT provided in the curing process is different between the base substrate 310 and the preliminary quantum dot layer 321-I. As a result, a predetermined residual stress is generated in the preliminary quantum dot layer 321-I, and the wrinkle degree increases as the residual stress becomes a compressive stress.

Next, as shown in FIG. 8E, the upper barrier layer 323 is formed on the quantum dot layer (QDL) 321, thereby forming the optical member 300. The upper barrier layer 323 is formed by coating the upper surface 321-S of the quantum dot layer with an inorganic film. The coating method includes a vapor deposition or printing process.

At this time, in the upper barrier layer 323, wrinkles are formed along the upper surface 321-S of the quantum dot layer and on the upper surface 323-S (hereinafter, upper surface of the upper barrier layer). The upper surface 323-S of the upper barrier layer UBL reflects the upper surface 321-S of the quantum dot layer. Thereby, the upper surface 323-S of the upper barrier layer includes a plurality of wrinkles WRK corresponding to the quantum dot layer (QDL) wrinkles WRK-Q.

In the optical member 300 according to the present embodiment, by forming the upper barrier layer 323 formed of an inorganic material on the quantum dot layer 321 including the upper surface 321-S of the wrinkle, the upper surface 323-S of the wrinkle is formed on the upper barrier layer 323. Form. In the quantum dot layer 321, the deformation caused in the hardening process is caused by the stress due to the heat HT. The quantum dot layer 321 relaxes the stress due to the heat HT by forming the non-uniform upper surface 321-S.

According to the present invention, by forming the upper barrier layer 323 as it is on the deformed quantum dot layer 321, the deformation of the quantum dot layer 321 that may occur later is prevented. In addition, according to the present invention, the upper barrier layer 323 is formed along the wrinkle (WRK-Q) of the quantum dot layer (QDL) 321, so that the QDL wrinkle WRK can be generated depending on the deformation of the quantum dot layer 321 that may occur later. Even if -Q is deformed, damage and peeling of the upper barrier layer 323 are improved.

On the other hand, referring to FIGS. 9A to 9D, the quantum dot layer (QDL) wrinkle WRK-Q and the wrinkle WRK on the upper surface of the upper barrier layer (UBL) are simultaneously formed. As shown in FIGS. 9A and 9B, the first preliminary quantum dot layer 321-I1 is cured to form the second preliminary quantum dot layer 321-I2. The first preliminary quantum dot layer 321-I1 corresponds to the preliminary quantum dot layer 321-I shown in FIG. 7C.

The second preliminary quantum dot layer 321-I2 formed by curing the first preliminary quantum dot layer 321-I1 has a flat upper surface 321-S20, unlike the quantum dot layer 321 shown in FIG. 8D. The upper surface 321-S10 of the first preliminary quantum dot layer 321-I1 and the upper surface 321-S20 of the second preliminary quantum dot layer 321-I2 are substantially the same. At this time, the second preliminary quantum dot layer 321-I2 is in a state of being stressed by the heat HT, but the upper surface is not deformed from the first preliminary quantum dot layer 321-I1.

Next, as shown in FIG. 9C, a preliminary upper barrier layer 323-I is formed on the second preliminary quantum dot layer 321-I2. The preliminary upper barrier layer 323-I has an upper surface 323-S10 that reflects the upper surface 321-S20 of the second preliminary quantum dot layer. As a result, the upper surface 323-S10 of the preliminary upper barrier layer 323-I is a flat surface.

At this time, as shown in FIG. 9D, the second preliminary quantum dot layer 321-I2 and the preliminary upper barrier layer 323-I are deformed to form the quantum dot layer 321 and the upper barrier layer 323. In the present invention, for ease of description, the upper barrier layer 323 is formed and then deformed. However, the present invention is not limited to this, and deformation occurs during the process of forming the upper barrier layer 323. You can also do so.

The quantum dot layer 321 is formed while the second preliminary quantum dot layer 321-I2 is deformed by the residual stress SS caused by the stress due to the heat HT. Wrinkles (WRK-Q, WRK) due to residual stress SS are formed on the upper surface 321-S of the quantum dot layer and the upper surface 323-S of the upper barrier layer 323, respectively. The residual stress SS is a compressive stress for wrinkles (WRK-Q, WRK).

According to the present invention, the upper barrier layer 323 is formed as it is on the deformed quantum dot layer (QDL) 321, thereby preventing the quantum dot layer 321 from being deformed. Further, according to the present invention, by forming the upper barrier layer 323 along the wrinkle (WRK1) of the quantum dot layer 321, even if the wrinkle WRK1 is deformed according to the deformation of the quantum dot layer 321 that may occur later, Damage and peeling of the upper barrier layer 323 are improved.

FIG. 10 is an exploded perspective view of a display device according to another exemplary embodiment of the present invention. 11A to 11D are cross-sectional views showing a method of manufacturing an optical member according to another embodiment of the present invention. Hereinafter, the present invention will be described with reference to FIGS. 10 to 11D.

As shown in FIG. 10, the display device DA-C has a bent shape. The display device DA-C includes a display panel 100C, a backlight unit BLU, an upper protection member 410C, a lower protection member 420C, and an optical film 500.

The display panel 100C has a curved shape. The display panel 100C includes a first substrate 110C and a second substrate 120C. The first substrate 110C and the second substrate 120C correspond to the first substrate 110 and the second substrate 120 shown in FIG. 1 except for the curved shape, and thus duplicated description will be omitted below.

The upper protection member 410C and the lower protection member 420C each have a bent shape. The optical film 500 is assembled in the display device DA-C in a bent state. Since the upper protection member 410C, the lower protection member 420C, and the optical film 500 correspond to the upper protection member 410, the lower protection member 420, and the optical film 500 shown in FIG. 1 except for the bent shape, A duplicate description will be omitted.

The backlight unit BLU includes a light source 200C and an optical member 300C. The light source 200C includes a circuit board 210C and a plurality of light emitting elements 220C. In the present invention, since the light source 200C is substantially the same as the light source 200 shown in FIG. 1, the duplicated description will be omitted below.

The optical member 300C has a shape bent along one direction. The upper surface 300C-S of the optical member 300C is a surface facing the display panel 100C. The optical member 300C corresponds to the optical member 300 shown in FIG. 1 except for the curved shape. Hereinafter, the optical member 300C will be described with reference to FIGS. 11A to 11D.

As shown in FIGS. 11A and 11B, the preliminary base substrate 310C-I is bent around a predetermined bending axis BX to form a curved base substrate 310C. At this time, a predetermined stress SS1 is generated in the base substrate 310C. The stress SS1 is a compressive stress. The base substrate 310C is bent around the bending axis BX due to the stress SS1.

The base substrate 310C is bent to have a predetermined radius of curvature RC about the bending axis BX. Meanwhile, although the radius of curvature RC is shown to be constant in the present embodiment, the present invention is not limited thereto, and the base substrate 310C according to the present embodiment is bent to have a different radius of curvature RC.

Next, as shown in FIG. 11C, a lower barrier layer 322C, a quantum dot layer 321C, and an upper barrier layer 323C are sequentially formed on the base substrate 310C to form an optical member 300C. The wrinkle WRK is formed on the upper surface 323C-S of the upper barrier layer 323C. The wrinkle WRK is formed as described above when the quantum dot layer 321C is cured or because of the wrinkle formed when the upper barrier layer 323C is formed. A duplicate description of this will be omitted.

On the other hand, as shown in FIG. 11D, a predetermined stress SS2 is generated in the base substrate 310C after the optical member 300C is formed. The stress SS2 is a residual stress of the base substrate 310C and a tensile stress. The residual stress is induced based on the bending stress applied to the base substrate 310C.

According to the present invention, due to the upper surface 323C-S of the upper barrier layer including the wrinkle WRK, even if the shape of the quantum dot layer 321C or the like is deformed by the stress SS2, the adhesion between the upper barrier layer 323C and the quantum dot layer 321C is formed. Power is maintained stably. As a result, defects such as peeling of the upper barrier layer 323C from the quantum dot layer 321C and generation of cracks or the like that occur in the upper barrier layer 323C are reduced, and the reliability of the optical member 300C is improved.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the present invention is not limited to the above-described embodiments, and various modifications are made without departing from the technical idea of the present invention. It is possible to carry out.

10, 20, 30 1st-3rd insulating layer 100, 100C Display panel 110, 110C 1st board 120, 120C 2nd board 200, 200C Light source 210, 210C Circuit board 220, 220C Light emitting element 300, 300-1, 300C , 300-CS, 300-TS Optical member 300-S, 300C-S Upper surface of optical member 310, 310C Base substrate 310-S Upper surface of base substrate 310C-I Preliminary base substrate 320, 320-1, 320-2, 320C Quantum dot unit 321, 321C Quantum dot layer (QDL)
321-I Preliminary quantum dot layer 321-I1, 321-I2 First and second preliminary quantum dot layer 321-S1
321-S Quantum dot layer (QDL) upper surface 321-S10, 321-S20 First and second preliminary quantum dot layer upper surfaces 322, 322-1, 322C Lower barrier layer (LBL)
322-S upper surface of lower barrier layer 323, 323-1, 323C upper barrier layer (UBL)
323-I Preliminary upper barrier layer 323-S, 323C-S Upper surface of upper barrier layer 323-S10 Upper surface of preliminary upper barrier layer 324 Cover layer (protective layer)
324-S Upper surface of cover layer (protective layer) 330 Low refractive index layer 410, 410C Upper protective member 410-OP opening 420, 420C Lower protective member 420-B Lower protective member bottom 420-SS Internal space 420-W Lower portion Side wall portion of protective member 500 Optical film AA Active area AL Semiconductor pattern BLU, BLU-1 Backlight unit BM Black matrix CC Overcoat layer CE Control electrode CF Color filter layer C _LC Liquid crystal capacitor CME Common electrode CP Color pattern DA, DA- C display device IE input electrode IS display surface L11, L21 first, second lower layer L12, L22 first, second upper layer LCL liquid crystal layer MX medium layer NAA peripheral region OE output electrode PE pixel electrode PT1, PT2 first, 2nd quantum dot PX pixel S1, S2 1st, 2nd base layer SF-L Lower surface of a base substrate SF-U Upper surface of a base substrate SF1-SF4 1st-4th side surface of a base substrate SP scattering particle TR Thin film transistor WRK, WRK -1 Wrinkle WRK1 to WRK3 First to third wrinkle WRK-C, WRK-T Wrinkle on the upper surface of the upper barrier layer WRK-Q Wrinkle on the upper surface of the quantum dot layer (QDL wrinkle)

Claims (24)

A base substrate,
A quantum dot layer including a first upper surface having a wrinkle disposed on the base substrate, and a quantum dot layer including a plurality of quantum dots dispersed in the medium layer;
A lower barrier layer disposed between the base substrate and the quantum dot layer,
An upper barrier layer covering the wrinkle on the first upper surface of the quantum dot layer,
The optical member, wherein the upper barrier layer has a second upper surface including a wrinkle corresponding to the wrinkle on the first upper surface. The optical member according to claim 1, wherein the upper barrier layer has a uniform thickness on the base substrate. The optical member according to claim 2, wherein the quantum dot layers have different thicknesses on the base substrate. The optical member according to claim 2, wherein the upper barrier layer includes an inorganic film. A plurality of the wrinkles are provided,
The optical member according to claim 1, wherein at least one of the plurality of wrinkles has a curved shape on a plane. The optical member according to claim 5, wherein at least two wrinkles of the plurality of wrinkles are connected to each other. The optical member according to claim 5, wherein the curved shape includes a closed curved shape. The plurality of wrinkles includes a first wrinkle having a first closed curve shape and a second wrinkle having a second closed curve shape,
The optical member according to claim 7, wherein the first closed curve shape and the second closed curve shape are different from each other. The optical member according to claim 8, wherein the first wrinkle and the second wrinkle are connected to each other. The optical member according to claim 5, wherein a vertical thickness of each of the plurality of wrinkles is within 1 μm. The optical member according to claim 10, wherein a distance between the plurality of wrinkles is 100 μm or less. The optical member of claim 1, further comprising a low refractive index layer having a refractive index of 1.5 or less, disposed between the base substrate and the lower barrier layer. The optical member according to claim 12, wherein the base substrate includes a glass substrate. Further comprising a protective layer disposed on the upper barrier layer and including an organic material,
The optical member according to claim 12, wherein the protective layer has a flat upper surface that covers the second upper surface. A light source that produces light,
An optical member including an incident surface facing the light source,
A display panel disposed on the optical member, the display panel including a plurality of pixels,
The optical member is
A base substrate that includes an upper surface that faces the display panel, a lower surface that faces the upper surface, and a plurality of side surfaces that connect the upper surface and the lower surface, and that the incident surface is at least one of the side surfaces;
A lower barrier layer disposed on the base substrate and including a flat upper surface;
An upper barrier layer disposed on the lower barrier layer and including an upper surface having a plurality of wrinkles that are non-uniform compared to an upper surface of the lower barrier layer;
A quantum dot layer disposed between the lower barrier layer and the upper barrier layer, the medium layer and a quantum dot layer including a plurality of quantum dots dispersed in the medium layer,
The display device is characterized in that the wrinkle has a curved shape on a plane. The wrinkle includes a first wrinkle having a first shape on a plane and a second wrinkle having a second shape on a plane,
The display device of claim 15, wherein the first shape and the second shape are different from each other. The display device of claim 16, wherein the first wrinkle and the second wrinkle are connected to each other. The display device of claim 15, wherein an upper surface of the medium layer has a wrinkle shape as compared with an upper surface of the base substrate. The medium layer has a non-uniform thickness on the base substrate,
The display device of claim 18, wherein the upper barrier layer has a uniform thickness on the base substrate. The display device of claim 18, wherein the upper barrier layer includes an inorganic film. The display device of claim 15, wherein the base substrate comprises a glass substrate. 22. The display device of claim 21, further comprising a low refractive index layer disposed between the base substrate and the quantum dot layer and having a refractive index of less than 1.5. Further comprising a protective layer disposed on the upper barrier layer and covering an upper surface of the upper barrier layer,
The display device of claim 15, wherein the protective layer has an upper surface that is flat compared to an upper surface of the upper barrier layer. The display apparatus of claim 15, wherein the display panel is bent around an axis extending along one direction.

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