Optical filter and display device including the same

Abstract

The present disclosure relates to an optical filter, which includes: a substrate including a plurality of pixel areas spaced apart from each other and a light blocking area between the plurality of pixel areas; a plurality of color filters arranged on a first surface of the substrate and corresponding to the plurality of pixel areas; and a plurality of conversion layers arranged on the first surface of the substrate and corresponding to the plurality of color filters. Each of the plurality of conversion layers includes an inclined side surface. The optical filter also includes a reflective layer on the inclined side surface of each of the plurality of conversion layers. The reflective layer extends to the light blocking area and is continuously arranged on two adjacent inclined side surfaces among the inclined side surfaces of the plurality of conversion layers and the light blocking area between the two adjacent inclined side surfaces.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority benefit of Korean Patent Application No. 10-2019-0002406 filed on January 8, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. Technical Field

[0003] Exemplary embodiments of the inventive concept relate to an optical filter and a display device including the same. Background Art

[0004] According to the progress of various types of electronic devices such as cellular phones, personal digital assistants (PDAs), computers, large TVs, etc., various types of display devices applicable to electronic devices are being developed. For example, display devices widely used in the market include: liquid crystal display devices including backlight units; organic light emitting display devices that emit light of different colors in each pixel area; and so on. Currently, a display device including a quantum dot color conversion layer (QD-CCL) is being developed. The quantum dots are excited by incident light, thereby emitting light having a wavelength longer than that of the incident light. Light of a low wavelength band can be mainly used as incident light. Summary of the invention

[0005] The color reproducibility and luminous efficiency of a display device including a quantum dot color conversion layer (QD-CCL) can be improved by improving the light conversion efficiency of quantum dots. Exemplary embodiments of the inventive concept include an optical filter and a display device including the optical filter, wherein the optical filter is configured to improve the utilization rate of incident light by reducing (e.g., due to being filtered out) incident light that may not excite quantum dots. However, exemplary embodiments of the inventive concept are not limited thereto.

[0006] According to an exemplary embodiment, a filter includes: a substrate including a plurality of pixel areas spaced apart from each other and a light blocking area arranged between the plurality of pixel areas; a plurality of color filters arranged on a first surface of the substrate and corresponding to the plurality of pixel areas; and a plurality of conversion layers arranged on the first surface of the substrate and corresponding to the plurality of color filters. Each of the plurality of conversion layers includes at least one inclined side surface. The filter also includes a reflective layer arranged on the at least one inclined side surface of each of the plurality of conversion layers. The reflective layer extends to the light blocking area and is continuously arranged on two adjacent inclined side surfaces of the inclined side surfaces of the plurality of conversion layers and the light blocking area between the two adjacent inclined side surfaces.

[0007] In an exemplary embodiment, a horizontal cross-sectional area of ​​at least one conversion layer of the plurality of conversion layers decreases in a direction away from the substrate.

[0008] In an exemplary embodiment, the plurality of color filters are spaced apart from each other, and the reflective layer extends to a portion between two adjacent ones of the plurality of color filters.

[0009] In an exemplary embodiment, the reflective layer is disposed between side surfaces of the two adjacent color filters.

[0010] In an exemplary embodiment, the plurality of color filters extend to the light blocking region such that side surfaces of the plurality of color filters contact each other.

[0011] In an exemplary embodiment, the plurality of color filters include: a first color filter; a second color filter; and a third color filter. Each of the plurality of color filters transmits light of a different color. The first color filter, the second color filter, and the third color filter overlap each other in the light blocking area to form a partition wall.

[0012] In an exemplary embodiment, the partition wall includes an inclined surface, and the plurality of conversion layers are arranged in a recess defined by the partition wall.

[0013] In an exemplary embodiment, the reflective layer covers an upper surface of the partition wall.

[0014] In an exemplary embodiment, the optical filter further includes: a planarization layer providing a planar surface by covering the plurality of conversion layers.

[0015] In an exemplary embodiment, the plurality of conversion layers include a first conversion layer, a second conversion layer, and a third conversion layer. Each of the plurality of conversion layers includes scattering particles. The first conversion layer also includes a first quantum dot, and the second conversion layer also includes a second quantum dot. The first quantum dot and the second quantum dot include the same material and have different sizes.

[0016] According to an exemplary embodiment, a display device includes: a light-emitting panel configured to emit incident light of a single color; and a filter configured to convert the incident light into light of different colors. The filter includes: a substrate including a plurality of pixel regions spaced apart from each other and a light blocking region arranged between the plurality of pixel regions; and a plurality of color filters arranged on a first surface of the substrate and corresponding to the plurality of pixel regions, wherein the first surface of the substrate faces the light-emitting panel. The filter also includes: a plurality of conversion layers arranged on the first surface of the substrate and corresponding to the plurality of color filters, wherein the incident light is incident on the plurality of conversion layers; and a reflective layer arranged on a side surface of the plurality of conversion layers. The reflective layer extends to the light blocking region and is arranged as a whole on the side surface of the plurality of conversion layers and in the light blocking region between the plurality of conversion layers.

[0017] In an exemplary embodiment, the light emitting panel includes: a plurality of light emitting devices configured to generate the incident light of a single color, and the light emitting devices are arranged to correspond to the plurality of pixel regions.

[0018] In an exemplary embodiment, the light emitting panel includes a liquid crystal layer including a plurality of liquid crystal molecules, and the filter further includes a planarization layer providing a flat surface by covering the plurality of conversion layers. The display device further includes a polarization layer disposed between the light emitting panel and the planarization layer.

[0019] In an exemplary embodiment, each of the plurality of conversion layers includes an inclined side surface, and horizontal cross-sectional areas of the plurality of conversion layers decrease in a direction away from the substrate.

[0020] In an exemplary embodiment, the plurality of color filters are spaced apart from each other, and the reflective layer is disposed between side surfaces of two adjacent ones of the plurality of color filters in the light blocking region.

[0021] In an exemplary embodiment, the plurality of color filters include a first color filter, a second color filter, and a third color filter. Each of the plurality of color filters transmits light of a different color. The first color filter, the second color filter, and the third color filter overlap each other in the light blocking area to form a partition wall. The plurality of conversion layers are arranged in a concave portion defined by the partition wall.

[0022] In an exemplary embodiment, the reflective layer covers an upper surface of the partition wall, and the upper surface of the partition wall faces the light emitting panel.

[0023] In an exemplary embodiment, the plurality of conversion layers include a first conversion layer, a second conversion layer, and a third conversion layer. Each of the plurality of conversion layers includes scattering particles. The first conversion layer also includes a first quantum dot, and the second conversion layer also includes a second quantum dot. The first quantum dot and the second quantum dot include the same material and have different sizes.

[0024] In an exemplary embodiment, colors of light passing through the first conversion layer, the second conversion layer, and the third conversion layer are different from each other, and the color of the light passing through the third conversion layer is the same as a color of the incident light.

[0025] In an exemplary embodiment, the display device further includes a low refractive index layer disposed between the plurality of color filters and the plurality of conversion layers and having a refractive index equal to or less than about 1.2. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other features of the present inventive concept will become more apparent by describing in detail exemplary embodiments of the present inventive concept with reference to the accompanying drawings, in which:

[0027] Figure 1 is a schematic plan view showing an example of a display device according to an exemplary embodiment;

[0028] Figure 2 According to an exemplary embodiment, Figure 1 A schematic cross-sectional view taken along line II-II';

[0029] Figure 3 yes Figure 2 An enlarged cross-sectional view of the first conversion layer to the third conversion layer;

[0030] Figure 4 According to an exemplary embodiment, Figure 1 A schematic cross-sectional view taken along line II-II';

[0031] Figure 5 According to an exemplary embodiment, Figure 1 A schematic cross-sectional view taken along line II-II';

[0032] Figure 6 FIG. 1 is a diagram showing a method according to an exemplary embodiment. Figure 1 A schematic cross-sectional view of a light emitting panel in a display device;

[0033] Figure 7 yes Figure 6 an equivalent circuit diagram of a pixel of a light-emitting panel; and

[0034] Figure 8 FIG. 1 is a diagram showing a method according to an exemplary embodiment. Figure 1Schematic cross-sectional view of a light-emitting panel in a display device. DETAILED DESCRIPTION

[0035] Hereinafter, exemplary embodiments of the inventive concept will be described more fully with reference to the accompanying drawings. Throughout the accompanying drawings, the same reference numerals may indicate the same elements. When a statement such as "at least one (kind) of ... " is after a column of elements, the entire column of elements is modified, without modifying the individual elements in the column.

[0036] It will be understood that although the terms "first," "second," etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. Thus, a "first" component in an exemplary embodiment may be described as a "second" component in another exemplary embodiment.

[0037] As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0038] It will be understood that when a layer, region or component is referred to as being "formed on" another layer, region or component, the layer, region or component may be directly or indirectly formed on the other layer, region or component. That is, for example, there may or may not be intervening layers, regions or components.

[0039] For ease of description, spatially relative terms such as "below", "below", "below", "above", and "on" may be used herein to describe the relationship between one element or assembly and another element or assembly as shown in the drawings. It will be understood that, in addition to the orientation shown in the drawings, spatially relative terms are also intended to cover different orientations of the device in use or operation. For example, in the case where the device shown in the drawings is flipped, a device located "below" or "below" another device may be placed "above" another device. Therefore, the exemplary term "below" may include both a lower position and an upper position. The device may also be positioned in other directions, and therefore, the spatially relative terms may be interpreted distinctively according to the orientation.

[0040] When a specific exemplary embodiment can be implemented differently, a specific process order can be performed differently from the described order. For example, two consecutively described processes can be performed substantially simultaneously or in an order opposite to the described order.

[0041] Figure 1 is a schematic plan view showing an example of a display device 10 according to an exemplary embodiment. Figure 2 According to an exemplary embodiment, Figure 1A schematic cross-sectional view taken along line II-II'. Figure 3 yes Figure 2 FIG. 1 is an enlarged cross-sectional view of a first conversion layer 150 , a second conversion layer 160 , and a third conversion layer 170 .

[0042] Reference Figures 1 to 3 According to an exemplary embodiment, the display device 10 may include an optical filter 100 and a light emitting panel 200 .

[0043] The optical filter 100 may receive incident light Lib generated from the light emitting panel 200 and emit light of the first color to the third color. In an exemplary embodiment, the incident light Lib incident on the optical filter 100 from the light emitting panel 200 may be monochromatic light, and the light of the first color to the third color emitted from the optical filter 100 may be red light, green light, and blue light, respectively. The optical filter 100 may be directly attached to the light emitting panel 200 by, for example, an adhesive layer. In an exemplary embodiment, an insulating layer or a filling layer may be further included between the optical filter 100 and the light emitting panel 200. The insulating layer may include a transparent material having transmittance, and the filling layer may include an air layer.

[0044] The filter 100 may include: a substrate 110; a first color filter 130a, a second color filter 130b, and a third color filter 130c, which are arranged on a first surface of the substrate 110; a first conversion layer 150, a second conversion layer 160, and a third conversion layer 170, which are arranged corresponding to the first color filter 130a, the second color filter 130b, and the third color filter 130c, respectively; and a reflective layer 190, which is arranged at least on a side surface of the first conversion layer 150, a side surface of the second conversion layer 160, and a side surface of the third conversion layer 170. The first surface of the substrate 110 refers to a surface facing the light emitting panel 200.

[0045] The substrate 110 includes a pixel area PA and a light blocking area BA. The pixel area PA is an area from which light is emitted and surrounded by the light blocking area BA. According to the color of the emitted light, the pixel area PA can be divided into a first pixel area PA1, a second pixel area PA2, and a third pixel area PA3. The first pixel area PA1, the second pixel area PA2, and the third pixel area PA3 may be spaced apart from each other. The light blocking area BA may be located between adjacent areas of the first pixel area PA1, the second pixel area PA2, and the third pixel area PA3.

[0046] The light blocking area BA is an area from which light is not emitted, and may surround the first pixel area PA1, the second pixel area PA2, and the third pixel area PA3. Figure 1 As shown, in an exemplary embodiment, the light blocking area BA may have a grid form. However, Figure 1The arrangement of each pixel region in the pixel regions PA1, PA2, and PA3 shown in FIG. 1 is exemplary, and the inventive concept is not limited thereto. For example, the first pixel region PA1, the second pixel region PA2, and the third pixel region PA3 may be arranged in a manner other than Figure 1 Arrange in various forms other than those shown.

[0047] The substrate 110 may include a material having transmissivity, such as, for example, an insulating material such as glass, plastic, crystal, etc. The material of the substrate 110 may be selected by taking into account, for example, mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, waterproofness, etc. In an exemplary embodiment, when the substrate 110 includes a polymer material, the substrate 110 may include, for example, polycarbonate (PC), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polysulfone (PSF), polymethyl methacrylate (PMMA), cellulose triacetate (TAC), cycloolefin polymer (COP), cycloolefin copolymer (COC), etc.

[0048] The first color filter 130a, the second color filter 130b, and the third color filter 130c include dyes or pigments so as to transmit only a specific color. For example, the first color filter 130a can selectively transmit only the light of the first color, the second color filter 130b can selectively transmit only the light of the second color, and the third color filter 130c can selectively transmit only the light of the third color. In an exemplary embodiment, the light of the first color can be red light, the light of the second color can be green light, and the light of the third color can be blue light. Red light can be light having a peak wavelength equal to or greater than about 580nm and less than about 750nm. Green light can be light having a peak wavelength equal to or greater than about 495nm and less than about 580nm. Blue light can be light having a peak wavelength equal to or greater than about 400nm and less than about 495nm. The incident light Lib can be light of the third color, that is, blue light.

[0049] As used herein, the term "about" includes the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, as understood by one of ordinary skill in the art, "about" may mean within one or more standard deviations.

[0050] The first color filter 130a may be arranged to correspond to at least the third pixel area PA3, the second color filter 130b may be arranged to correspond to at least the second pixel area PA2, and the third color filter 130c may be arranged to correspond to at least the first pixel area PA1. For example, the first color filter 130a may be arranged in the third pixel area PA3 without being arranged in the first pixel area PA1 and the second pixel area PA2, the second color filter 130b may be arranged in the second pixel area PA2 without being arranged in the first pixel area PA1 and the third pixel area PA3, and the third color filter 130c may be arranged in the first pixel area PA1 without being arranged in the second pixel area PA2 and the third pixel area PA3.

[0051] The first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may be arranged on the first surface of the substrate 110 to correspond to the first color filter 130a, the second color filter 130b, and the third color filter 130c, respectively. For example, the first conversion layer 150 may be arranged in the third pixel area PA3 together with the first color filter 130a, the second conversion layer 160 may be arranged in the second pixel area PA2 together with the second color filter 130b, and the third conversion layer 170 may be arranged in the first pixel area PA1 together with the third color filter 130c. When incident light Lib is generated from the light emitting panel 200, the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 convert the incident light Lib generated from the light emitting panel 200 into light having a specific color, and emit the light having the specific color toward the substrate 110.

[0052] In an exemplary embodiment, the first conversion layer 150 may convert incident light Lib as blue light into light of a first color Lr. The first color light Lr may be red light. To this end, the first conversion layer 150 may include a first photosensitive polymer 151 in which first quantum dots 152 are dispersed.

[0053] The first photosensitive polymer 151 may be a light-transmitting organic material, such as silicone resin, epoxy resin, etc.

[0054] The first quantum dots 152 may be excited by the blue incident light Lib to isotropically emit the first color light Lr having a wavelength longer than that of the blue light. The first quantum dots 152 may include, for example, II-VI compounds, III-V compounds, IV-VI compounds, IV compounds, or combinations thereof.

[0055] The first scattering particles 153 may be further dispersed in the first photosensitive polymer 151. The first scattering particles 153 may scatter a portion of the blue incident light Lib, that is, a portion that is not absorbed into the first quantum dots 152, so as to excite a greater number of first quantum dots 152. Therefore, the color conversion rate of the first conversion layer 150 may be improved. The first scattering particles 153 may include, for example, titanium dioxide (TiO 2 ), metal particles, etc.

[0056] The second conversion layer 160 converts the blue incident light Lib into the light Lg of the second color. The light Lg of the second color may be green light. The second conversion layer 160 may include a second photosensitive polymer 161 in which second quantum dots 162 are dispersed. In the second photosensitive polymer 161, second scattering particles 163 may be dispersed together with the second quantum dots 162. Therefore, the color conversion rate of the second conversion layer 160 may be improved.

[0057] The second photosensitive polymer 161 may include the same material as that of the first photosensitive polymer 151. The second scattering particles 163 may include the same material as that of the first scattering particles 153. The second quantum dots 162 may include, for example, a II-VI compound, a III-V compound, a IV-VI compound, a IV compound, or a combination thereof. That is, the second quantum dots 162 may be the same material as that of the first quantum dots 152. However, the size of the second quantum dots 162 may be different from that of the first quantum dots 152. For example, in an exemplary embodiment, the size of the second quantum dots 162 may be smaller than that of the first quantum dots 152. Therefore, the second quantum dots 162 may be excited by the blue incident light Lib, thereby isotropically emitting the second color light Lg having a wavelength longer than that of the blue light but shorter than that of the first color light Lr.

[0058] The third conversion layer 170 may include a third photosensitive polymer 171 in which third scattering particles 173 are dispersed. That is, the third conversion layer 170 does not include a separate quantum dot that can be excited by the blue incident light Lib. Similar to the first photosensitive polymer 151 and the second photosensitive polymer 161, the third photosensitive polymer 171 may include an organic material having light transmittance. The third scattering particles 173 may include the same material as that of the first scattering particles 153 and the second scattering particles 163. Therefore, since the blue incident light Lib incident on the third conversion layer 170 may pass through the third conversion layer 170 without color change, the third color light Lb emitted through the third conversion layer 170 may be blue light. However, the blue incident light Lib may be scattered by the third scattering particles 173 in the third conversion layer 170 and then emitted toward the substrate 110.

[0059] The first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may be covered by a barrier layer 180. The barrier layer 180 may be arranged on the entire first surface of the substrate 110 to cover the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170. For example, the barrier layer 180 may cover the entirety of each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170. The barrier layer 180 includes an inorganic insulating material, such as silicon nitride (SiN x ) and / or silicon oxide (SiO x ) as an example, and outgassing of the first conversion layer 150, the second conversion layer 160 and the third conversion layer 170 can be prevented.

[0060] Each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may have at least one inclined side surface. In a cross-sectional view, at least one inclined side surface may be inclined toward the center of the corresponding conversion layer. In an exemplary embodiment, each side surface of each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may be inclined. In addition, because the reflective layer 190 is arranged above the inclined side surface of each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170, the conversion efficiency of the first quantum dot 152 and the second quantum dot 162 and the luminous efficiency of the display device 10 may be improved.

[0061] The reflective layer 190 may be directly disposed on the barrier layer 180. The barrier layer 180 may include a metal material having excellent reflectivity, such as silver (Ag), aluminum (Al), etc. as an example. The reflective layer 190 may have a reflectivity equal to or greater than about 30%, for example, a reflectivity equal to or greater than about 50% and less than about 100%. The reflective layer 190 may extend to the light blocking area BA and may be disposed in the light blocking area BA. The reflective layer 190 reflects the incident light Lib that does not excite the first quantum dot 152 or the second quantum dot 162, thereby reducing the incident light Lib that does not excite the first quantum dot 152 or the second quantum dot 162 (for example, the incident light Lib that is filtered out). Therefore, the utilization rate of the incident light Lib may be improved (for example, less incident light Lib is wasted). Therefore, the conversion efficiency of the first quantum dot 152 and the second quantum dot 162 may be improved.

[0062] In addition, if Figure 2As shown, the inclined side surface of each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may be configured so that the horizontal cross-sectional area of ​​the first conversion layer 150, the horizontal cross-sectional area of ​​the second conversion layer 160, and the horizontal cross-sectional area of ​​the third conversion layer 170 decrease in a direction away from the substrate 110. For example, as the distance from the substrate 110 increases, the horizontal cross-sectional area of ​​each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may decrease. Therefore, when the light emitted from the first quantum dots 152 and the second quantum dots 162 and the light scattered by the third scattering particles 173 are reflected by the reflective layer 190, the reflected light may travel toward the substrate 110. Therefore, the light emission efficiency of the display device 10 may be improved. For example, the inclination angle of the inclined side surface of each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may be about 30° to about 85°.

[0063] The reflective layer 190 may extend to the light blocking area BA. For example, a portion of the reflective layer 190 may be disposed in the first pixel area PA1, the second pixel area PA2, and the third pixel area PA3, and the reflective layer 190 may extend from the first pixel area PA1, the second pixel area PA2, and the third pixel area PA3 to the light blocking area BA. The reflective layer 190 disposed in the light blocking area BA may prevent light from being emitted to the outside through the light blocking area BA and prevent light from leaking from the display device 10. The reflective layer 190 may be continuously disposed to correspond to two adjacent side surfaces of the side surface of the first conversion layer 150, the side surface of the second conversion layer 160, and the side surface of the third conversion layer 170, wherein the light blocking area BA is disposed between the two adjacent side surfaces. That is, the reflective layer 190 may be disposed as a whole over the side surface of the first conversion layer 150, the side surface of the second conversion layer 160, and the side surface of the third conversion layer 170 and in the light blocking area BA. For example, the reflective layer 190 may be arranged on two adjacent inclined side surfaces among the inclined side surfaces of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 in the light blocking area BA, and may extend continuously (e.g., without any break or opening) across the two adjacent inclined side surfaces and the corresponding light blocking area BA in which the reflective layer 190 is arranged. In an exemplary embodiment, the reflective layer 190 is not arranged on the bottom surface of the first conversion layer 150, the bottom surface of the second conversion layer 160, and the bottom surface of the third conversion layer 170. Here, the bottom surface refers to the surface of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 that faces the light emitting panel 200. Therefore, according to an exemplary embodiment of the inventive concept, since a separate light blocking member is not required to prevent light leakage, the structure of the filter 100 can be simplified.

[0064] like Figure 3 As shown, the first color filter 130a, the second color filter 130b and the third color filter 130c can be spaced apart from each other, and the reflective layer 190 can extend to the adjacent parts between the first color filter 130a, the second color filter 130b and the third color filter 130c. For example, in an exemplary embodiment, the concave portion 182 is located between the second color filter 130b and the third color filter 130c that are adjacent to each other. Because the reflective layer 190 is arranged in the concave portion 182, the reflective layer 190 is arranged between the side surface of the second color filter 130b and the side surface of the third color filter 130c that face each other. Therefore, when light is emitted via the second color filter 130b and the third color filter 130c, the mixing of the colors of the light can be prevented or reduced. Therefore, the color matching rate and color reproducibility of the display device 10 can be improved.

[0065] The low refractive index layer 140 may be further arranged between the first color filter 130a and the first conversion layer 150, between the second color filter 130b and the second conversion layer 160, and between the third color filter 130c and the third conversion layer 170. The low refractive index layer 140 may include an inorganic material or an organic material. That is, the low refractive index layer 140 may be arranged above the first surface of the substrate 110 on which the first color filter 130a, the second color filter 130b, and the third color filter 130c are arranged, and may cover the first color filter 130a, the second color filter 130b, and the third color filter 130c.

[0066] The low refractive index layer 140 may improve the luminous efficiency of light that has passed through the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170. The refractive index of the low refractive index layer 140 may be lower than the refractive index of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 and the refractive index of the first color filter 130a, the second color filter 130b, and the third color filter 130c. Therefore, the luminous efficiency of light that has passed through the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may be improved. For example, the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 and the first color filter 130a, the second color filter 130b, and the third color filter 130c may have, for example, a refractive index equal to or greater than about 1.4, for example, a refractive index of about 1.4 to about 1.7. In this case, the refractive index of the low refractive index layer 140 may be less than about 1.4, for example, equal to or less than about 1.2.

[0067] Because the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 are spaced apart from each other, the low refractive index layer 140 may be in direct contact with the barrier layer 180 in the light blocking area BA. That is, the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may each have a form encapsulated by the low refractive index layer 140 and the barrier layer 180. For example, each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may have a boundary defined by the low refractive index layer 140 and the barrier layer 180. For example, each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may have an upper boundary defined by the low refractive index layer 140 and a side boundary and a lower boundary defined by the barrier layer 180.

[0068] The filter 100 may further include a planarization layer 120 covering the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170, thereby providing a flat surface on the surface of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 facing the light emitting panel 200. The planarization layer 120 may include a transparent organic material, such as polyimide resin, acrylic resin, resist material, etc. The planarization layer 120 may be formed by using a wet process (such as a slit coating method, a spin coating method, etc.) or a dry process (such as a chemical vapor deposition method, a vacuum deposition method, etc.), etc.

[0069] Figure 4 According to an exemplary embodiment, Figure 1 For ease of explanation, further description of previously described elements and technical aspects may be omitted.

[0070] Reference Figure 4 , the display device 10 may include a light emitting panel 200 configured to emit blue incident light Lib and an optical filter 100 configured to receive the incident light Lib and emit light of a first color to light of a third color.

[0071] The filter 100 may include: a substrate 110 including a first pixel area PA1, a second pixel area PA2, and a third pixel area PA3 and a light blocking area BA; a first color filter 130a, a second color filter 130b, and a third color filter 130c arranged on a first surface of the substrate 110; a first conversion layer 150, a second conversion layer 160, and a third conversion layer 170 arranged to correspond to the first color filter 130a, the second color filter 130b, and the third color filter 130c, respectively; and a reflective layer 190 arranged at least on a side surface of the first conversion layer 150, a side surface of the second conversion layer 160, and a side surface of the third conversion layer 170. The first surface of the substrate 110 refers to a surface facing the light emitting panel 200.

[0072] In addition, the low refractive index layer 140 may also be arranged between the first color filter 130a and the first conversion layer 150, between the second color filter 130b and the second conversion layer 160, and between the third color filter 130c and the third conversion layer 170. Figures 1 to 3 As described, the first to third conversion layers 150 , 160 , and 170 may be covered by the barrier layer 180 , and the planarization layer 120 covers the first to third conversion layers 150 , 160 , and 170 , thereby providing a planar surface to the optical filter 100 .

[0073] Reference Figure 4 , the first color filter 130a, the second color filter 130b and the third color filter 130c extend to the light blocking area BA between the adjacent areas in the first pixel area PA1, the second pixel area PA2 and the third pixel area PA3, so that the side surfaces adjacent to each other of the first color filter 130a, the second color filter 130b and the third color filter 130c are in contact with each other. For example, the side surfaces adjacent to each other of the first color filter 130a, the second color filter 130b and the third color filter 130c can be in direct contact with each other. Because the size of the first color filter 130a, the second color filter 130b and the third color filter 130c is larger than the size of the first pixel area PA1, the second pixel area PA2 and the third pixel area PA3, even when an error occurs in the position where the first color filter 130a, the second color filter 130b and the third color filter 130c are arranged, no defect occurs in the filter 100. Therefore, the manufacturing efficiency of the filter 100 can be improved.

[0074] In addition, the thickness of the first color filter 130a, the thickness of the second color filter 130b and the thickness of the third color filter 130c can be the same as each other. In this case, the side surface of the first color filter 130a, the side surface of the second color filter 130b and the side surface of the third color filter 130c can contact each other, thereby forming a substantially flat surface. Here, when the surface is referred to as substantially flat, it will be understood that the surface is completely flat, or if it is not completely flat, it is approximately flat within the measurement error as understood by a person of ordinary skill in the art. Because the surface formed by the first color filter 130a, the second color filter 130b and the third color filter 130c is substantially flat, it is possible to effectively perform a subsequent process in which a low refractive index layer 140, a barrier layer 180 and a reflective layer 190 are formed above the first color filter 130a, the second color filter 130b and the third color filter 130c.

[0075] Each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may have an inclined side surface, and the reflective layer 190 is arranged above the inclined side surface of each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170. For example, each of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 may have a side surface inclined toward the center of the corresponding conversion layer. Therefore, the first quantum dot 152 and the second quantum dot 162 (see Figure 3 ) and the luminous efficiency of the display device 10. In addition, since the reflective layer 190 extends to the light blocking area BA, the reflective layer 190 can prevent light from being emitted to the outside (e.g., the outside of the display device 10) through the light blocking area BA. Therefore, leakage of light from the display device 10 can be prevented or reduced. Therefore, according to an exemplary embodiment of the inventive concept, since a separate light blocking member is not required to prevent light leakage, the structure of the filter 100 can be simplified.

[0076] Figure 5 According to an exemplary embodiment, Figure 1 For ease of explanation, further description of previously described elements and technical aspects may be omitted.

[0077] Reference Figure 5 , the display device 10 may include an optical filter 100 and a light emitting panel 200 .

[0078] The filter 100 may include: a substrate 110 including a first pixel area PA1, a second pixel area PA2, and a third pixel area PA3 and a light blocking area BA; a first color filter 130a, a second color filter 130b, and a third color filter 130c arranged on a first surface of the substrate 110; a first conversion layer 150a, a second conversion layer 150b, and a third conversion layer 150c arranged to correspond to the first color filter 130a, the second color filter 130b, and the third color filter 130c, respectively; and a reflective layer 190 arranged at least on a side surface of the first conversion layer 150a, a side surface of the second conversion layer 150b, and a side surface of the third conversion layer 150c. The first surface of the substrate 110 refers to a surface facing the light emitting panel 200.

[0079] The first color filter 130a, the second color filter 130b and the third color filter 130c may overlap each other in the light blocking area BA. The first color filter 130a, the second color filter 130b and the third color filter 130c may each transmit light of a specific color, for example, only red light, only green light or only blue light. When the first color filter 130a, the second color filter 130b and the third color filter 130c are stacked, the stacked first color filter 130a, the second color filter 130b and the third color filter 130c may be used as a black matrix to block light. Therefore, when the first color filter 130a, the second color filter 130b and the third color filter 130c overlap each other in the light blocking area BA, it is possible to prevent light from being emitted to the outside (for example, the outside of the display device 10) through the light blocking area BA. Therefore, it is possible to prevent or reduce the leakage of light from the display device 10.

[0080] In addition, the first color filter 130a, the second color filter 130b, and the third color filter 130c overlapped in the light blocking area BA constitute a partition wall 132, which defines an area in which the first conversion layer 150a, the second conversion layer 150b, and the third conversion layer 150c are arranged. The first conversion layer 150a, the second conversion layer 150b, and the third conversion layer 150c can be formed in a concave portion defined by the partition wall 132 by using an inkjet method. Even if the method of forming the first conversion layer 150a, the second conversion layer 150b, and the third conversion layer 150c is different from the reference Figure 2 The method of forming the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170 described, the functions of the first conversion layer 150a, the second conversion layer 150b, and the third conversion layer 150c can still be the same as the functions of the first conversion layer 150, the second conversion layer 160, and the third conversion layer 170. Therefore, the first conversion layer 150a, the second conversion layer 150b, and the third conversion layer 150c can convert light incident from the light emitting panel 200 into light of a specific color and emit the light of the specific color toward the substrate 110.

[0081] In the case where the first color filter 130a, the second color filter 130b, and the third color filter 130c constitute the partition wall 132 when they overlap each other in the light blocking area BA, the partition wall 132 has an inclined surface, and the reflective layer 190 may be arranged on the inclined surface of the partition wall 132. For example, when the horizontal cross-sectional area of ​​the partition wall 132 becomes farther from the substrate 110, the inclined surface of the partition wall 132 may be reduced. In this case, the reflective layer 190 may be arranged on the first surface of the partition wall 132 so as to cover the light blocking area BA. Here, the first surface of the partition wall 132 is a surface facing the light emitting panel 200 as a display panel, and may be referred to as an upper surface of the partition wall 132. In the case where the reflective layer 190 is arranged on the first surface of the partition wall 132, when the light generated from the light emitting panel 200 travels toward the partition wall 132, the light is reflected by the reflective layer 190 and guided toward the light emitting panel 200. The light reflected toward the light emitting panel 200 may be reflected again by the light emitting panel 200, for example, by the opposing electrode 235 (at Figure 6 ) is reflected again, and is incident again on the optical filter 100. Therefore, the utilization efficiency of the incident light can be improved.

[0082] As described above, when the partition wall 132 has an inclined surface, the first conversion layer 150a, the second conversion layer 150b, and the third conversion layer 150c, each located in a recess between the partition walls 132, may have an inclined surface. Therefore, the reflective layer 190 is arranged on the inclined surface of the first conversion layer 150a, the inclined surface of the second conversion layer 150b, and the inclined surface of the third conversion layer 150c. When the light generated from the light emitting panel 200 is reflected by the reflective layer 190, the reflective layer 190 may guide the light toward the central portion of the first conversion layer 150a, the second conversion layer 150b, and the third conversion layer 150c. Therefore, the utilization rate of the incident light can be improved, and the light conversion efficiency of the filter 100 can be improved.

[0083] The planarization layer 120 may be disposed over the partition wall 132 and the first, second, and third conversion layers 150a, 150b, and 150c. The planarization layer 120 may cover the partition wall 132 and the first, second, and third conversion layers 150a, 150b, and 150c, thereby providing a substantially flat surface.

[0084] The low refractive index layer 140 may be arranged on the first color filter 130a, the second color filter 130b, and the third color filter 130c. The low refractive index layer 140 may improve the luminous efficiency of the light that has passed through the first conversion layer 150a, the second conversion layer 150b, and the third conversion layer 150c. In addition, the barrier layer 180 may be arranged on the low refractive index layer 140. The barrier layer 180 may prevent the first color filter 130a, the second color filter 130b, and the third color filter 130c from being degassed. The barrier layer 180 may include an inorganic material. For example, the barrier layer 180 may include a material such as silicon nitride (SiN x ) and / or silicon oxide (SiO x Alternatively, the barrier layer 180 may include an organic insulating material or an inorganic insulating layer and an organic insulating layer.

[0085] Figure 6 FIG. 1 is a diagram showing a method according to an exemplary embodiment. Figure 1 Schematic cross-sectional view of a light emitting panel 200 in a display device 10. Figure 7 yes Figure 6 1 is an equivalent circuit diagram of a pixel of the light emitting panel 200.

[0086] Reference Figure 6 and Figure 7 , the light emitting panel 200 may include a first pixel PX1, a second pixel PX2, and a third pixel PX3. The first pixel PX1 includes a light emitting device 230 and a first pixel circuit 220a configured to control the light emitting device 230. The second pixel PX2 includes a light emitting device 230 and a second pixel circuit 220b configured to control the light emitting device 230. The third pixel PX3 includes a light emitting device 230 and a third pixel circuit 220c configured to control the light emitting device 230.

[0087] The light emitting device 230 may emit light of a third color, for example, blue light Lb, wherein the amount of the emitted light is controlled by each of the first pixel circuit 220a, the second pixel circuit 220b, and the third pixel circuit 220c. The light emitting device 230 is arranged to correspond to the filter 100 (in Figure 2 The pixel area PA (shown in Figure 1 The blue light Lb emitted from the light emitting device 230 is incident on the filter 100 (in Figure 2 The incident light Lib on Figure 2 ).

[0088] For example, when the amount of the third color light Lb is controlled by the first pixel circuit 220a of the first pixel PX1 and the third color light Lb is emitted from the light emitting device 230, the third color light Lb is transmitted through the first conversion layer 150 (at Figure 2) is converted into light of a first color, and the light of the first color is transmitted through the substrate 110 (in Figure 2 When the amount of the third color light Lb is controlled by the second pixel circuit 220b of the second pixel PX2 and the third color light Lb is emitted from the light emitting device 230, the third color light Lb is emitted from the second conversion layer 160 (in Figure 2 ) is converted into light of a second color, and the light of the second color is transmitted through the substrate 110 (in Figure 2 In addition, when the amount of the third color light Lb is controlled by the third pixel circuit 220c of the third pixel PX3 and the third color light Lb is emitted from the light emitting device 230, the third color light Lb is transmitted through the substrate 110 (in the case of the third conversion layer 170) without any color conversion. Figure 2 Therefore, since the blue light Lb emitted from the light emitting panel 200 is incident on the filter 100 (in Figure 2 ) and is converted into red light, green light and blue light, so the color image is displayed as an image of blue light Lb.

[0089] Each of the first pixel circuit 220a, the second pixel circuit 220b, and the third pixel circuit 220c is arranged in the pixel circuit layer 220 below the light emitting device 230. In an exemplary embodiment, each of the first pixel circuit 220a, the second pixel circuit 220b, and the third pixel circuit 220c may at least partially overlap with the light emitting device 230. In an exemplary embodiment, each of the first pixel circuit 220a, the second pixel circuit 220b, and the third pixel circuit 220c does not overlap with the light emitting device 230.

[0090] like Figure 7 As shown, each of the first pixel circuit 220a, the second pixel circuit 220b and the third pixel circuit 220c may include: a first thin film transistor T1 and a second thin film transistor T2, a storage capacitor Cst and wiring electrically connected to the first thin film transistor T1 and the second thin film transistor T2 and the storage capacitor Cst. However, it will be understood that Figure 7 The configuration shown in FIG. 2 is exemplary, and the first pixel circuit 220a, the second pixel circuit 220b, and the third pixel circuit 220c may have the same Figure 7 The configuration shown in the figure is different from various configurations. Figure 7 It may correspond to any pixel circuit among the first pixel circuit 220a, the second pixel circuit 220b and the third pixel circuit 220c. Figure 7 In the figure, the pixel circuit is indicated by PC.

[0091] The second thin film transistor T2 is a switching thin film transistor and is connected to the scan line SL and the data line DL. According to the switching voltage input from the scan line SL, when the data voltage is input from the data line DL, the second thin film transistor T2 can transmit the data voltage to the first thin film transistor T1. The storage capacitor Cst is connected to the second thin film transistor T2 and the driving voltage line PL. The storage capacitor Cst can store a voltage corresponding to the difference between the voltage transmitted from the second thin film transistor T2 and the first power supply voltage ELVDD supplied to the driving voltage line PL. The first thin film transistor T1 is a driving thin film transistor and is connected to the driving voltage line PL and the storage capacitor Cst. The first thin film transistor T1 can control the driving current flowing from the driving voltage line PL to the light emitting device 230 corresponding to the value of the voltage stored in the storage capacitor Cst.

[0092] The light emitting device 230 may emit light having a specific brightness according to the driving current. The light emitting device 230 may include a pixel electrode 231, an intermediate layer 233, and an opposite electrode 235. The opposite electrode 235 of the light emitting device 230 may receive a second power supply voltage ELVSS. As an example, the light emitting device 230 may be an organic light emitting diode. However, the light emitting device 230 is not limited thereto.

[0093] The pixel electrode 231 may be electrically connected to a source electrode or a drain electrode of the thin film transistor. The pixel electrode 231 is exposed through an opening of the pixel defining layer 237 , and an edge of the pixel electrode 231 may be covered by the pixel defining layer 237 .

[0094] The intermediate layer 233 may be disposed on the pixel electrode 231 exposed by the pixel defining layer 237. The intermediate layer 233 may include an organic emission layer. The organic emission layer may be, for example, a low molecular weight organic material or a polymer organic material. In addition to the organic emission layer, the intermediate layer 233 may also selectively include a functional layer such as a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL), an electron injection layer (EIL), etc. as examples.

[0095] The opposing electrode 235 may be arranged to cover the intermediate layer 233 and the pixel defining layer 237. The opposing electrode 235 may be, for example, a transparent or semi-transparent electrode. For example, the opposing electrode 235 may include a metal film having a low work function. The opposing electrode 235 may include a transparent conductive layer including, for example, a transparent conductive oxide (TCO).

[0096] The encapsulation layer 240 may be disposed on the light emitting device 230. The encapsulation layer 240 may cover the opposite electrode 235 and be disposed over the entire surface of the base substrate 210. The encapsulation layer 240 may include an inorganic encapsulation layer including at least one inorganic material and an organic encapsulation layer including at least one organic material. In an exemplary embodiment, the encapsulation layer 240 may have a structure in which a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer are stacked.

[0097] Figure 8 FIG. 1 is a diagram showing a method according to an exemplary embodiment. Figure 1 Schematic cross-sectional view of a light emitting panel 200 in a display device 10.

[0098] As mentioned above Figure 7 Described, from Figure 8 The light generated by the light emitting panel 200 is incident on Figure 2 The blue light on the filter 100.

[0099] Reference Figure 8 , the light emitting panel 200 may include: a first substrate 211, a liquid crystal layer 203 disposed above the first substrate 211 and including a plurality of liquid crystal molecules 213, and a pixel electrode PE and a common electrode CE each applying an electric field to the liquid crystal layer 203. In addition, the light emitting panel 200 may include a second substrate 212 facing the first substrate 211.

[0100] A thin film transistor (TFT) array layer, a pixel electrode PE, and a first alignment layer AL1 may be disposed over the first substrate 211 .

[0101] The first substrate 211 may be a glass substrate or a plastic substrate including, for example, PET, polyethylene naphthalate (PEN), polyimide, or the like.

[0102] The TFT array layer includes a switching device TFT, and includes a plurality of gate lines and a plurality of data lines. The switching device TFT is a thin film transistor, and includes an active layer AT, a gate electrode GE, a source electrode SE, and a drain electrode DE.

[0103] A first insulating layer L1 as a gate insulating layer is arranged on the gate electrode GE. An active layer AT is arranged on the first insulating layer L1. A source electrode SE and a drain electrode DE are arranged on the active layer AT. The source electrode SE and the drain electrode DE are spaced apart from each other. A second insulating layer L2 is arranged to cover the source electrode SE and the drain electrode DE. Figure 8 In the embodiment, a bottom-gate thin film transistor in which the gate electrode GE is arranged below the active layer AT is shown as an example. However, the present invention is not limited thereto. For example, various types of thin film transistors may be used, such as a top-gate thin film transistor in which the gate electrode GE is arranged above the active layer AT.

[0104] The active layer AT may include various materials. For example, in an exemplary embodiment, the active layer AT may include an inorganic semiconductor material such as amorphous silicon or crystalline silicon. In an exemplary embodiment, the active layer AT may include an oxide semiconductor. In an exemplary embodiment, the active layer AT may include an organic semiconductor material.

[0105] The gate electrode GE, the source electrode SE and the drain electrode DE may include a single layer or a multilayer, and the single layer or the multilayer includes at least one material selected from, for example, Al, platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), molybdenum (Mo), titanium (Ti), tungsten (W) and copper (Cu).

[0106] The first insulating layer L1 and the second insulating layer L2 may include various types of insulating materials. Each of the first insulating layer L1 and the second insulating layer L2 may include a single-layer structure or a multi-layer structure including one or more insulating layers, each of which includes, for example, silicon dioxide (SiO 2 ), silicon nitride (SiN x ), silicon oxynitride (SiON), aluminum oxide (Al 2 O 3 ), titanium dioxide (TiO 2 ), Tantalum pentoxide (Ta 2 O 5 ), hafnium oxide (HfO 2 )、ZrO 2 ), barium strontium titanate (BST) and lead zirconate titanate (PZT).

[0107] A planarization layer 250 may be further disposed above the TFT array layer. A pixel electrode PE is disposed on the planarization layer 250. The pixel electrode PE passes through the planarization layer 250 and the second insulating layer L2, thereby being connected to the drain electrode DE of the switching device TFT. A first alignment layer AL1 configured to align the liquid crystal molecules 213 may be disposed on the pixel electrode PE.

[0108] The light blocking pattern BP, the color filter CF, an over-coating layer OC, and the common electrode CE are disposed over the second substrate 212. In addition, a second alignment layer AL2 configured to align the liquid crystal molecules 213 may be disposed on the common electrode CE.

[0109] The second substrate 212 may be a glass substrate or a plastic substrate. The outer surface of the second substrate 212 is a display surface DS.

[0110] The light blocking pattern BP is arranged on the second substrate 212 at a position corresponding to the region where the switching device TFT, the gate line and the data line are arranged. The light blocking pattern BP blocks light. It will be understood that Figure 8 The position in which the light blocking pattern BP is arranged is exemplary, and the inventive concept is not limited thereto. For example, in an exemplary embodiment, the light blocking pattern BP may be arranged on the first substrate 211 .

[0111] The color filter CF is disposed on the second substrate 212 and filters the colored light. Figure 8 The arrangement of the color filter CF shown in FIG. 2 is exemplary, and the inventive concept is not limited thereto. For example, in an exemplary embodiment, the color filter CF may be arranged on the first substrate 211 .

[0112] The overcoat layer OC is disposed over the second substrate 212 on which the color filter CF is disposed. The overcoat layer OC planarizes the upper surface of the second substrate 212. In an exemplary embodiment, the overcoat layer OC may be omitted.

[0113] The common electrode CE is arranged above the second substrate 212 to face the pixel electrode PE. A reference voltage (ie, a common voltage) is applied to the common electrode CE, wherein the reference voltage defines the polarity of the voltage applied to the pixel electrode PE. In an exemplary embodiment, the common electrode CE may have a flat plate shape. However, the inventive concept is not limited thereto.

[0114] The liquid crystal layer 203 includes liquid crystal molecules 213 . Figure 8 An example is shown in which the liquid crystal layer 203 is a vertically aligned liquid crystal layer. However, the inventive concept is not limited thereto. For example, in an exemplary embodiment, the liquid crystal molecules 213 may be aligned in a horizontal direction and may be offset by about 90° between the pixel electrode PE and the common electrode CE.

[0115] When a voltage is applied between the pixel electrode PE and the common electrode CE, an electric field is applied to the liquid crystal layer 203. The electric field changes the arrangement of the liquid crystal molecules 213, thereby adjusting the amount of light passing through the liquid crystal layer 203 so that the light emitting panel 200 can generate light.

[0116] In an exemplary embodiment, the polarizing layer 270 may be disposed on the display surface DS of the second substrate 212. In an exemplary embodiment, the polarizing layer 270 may be disposed on the filter 100 (in Figure 2 The planarization layer 120 (shown in Figure 2 When light is generated from the light emitting panel 200, the polarizing layer 270 can make the light incident on the filter 100 (in the polarized state). Figure 2 When the polarizing layer 270 is arranged on the substrate 110 (in Figure 2 When the polarizing layer 270 is on the second surface of the optical filter 100 (shown in FIG. Figure 2 In this case, when light passes through the filter 100 (in Figure 2 ), it may be difficult to generate accurate polarization by using the polarization layer 270 because scattering or the like occurs. Therefore, the polarization layer 270 may be disposed between the light emitting panel 200 and the filter 100 (in Figure 2 shown in ).

[0117] According to exemplary embodiments of the inventive concept, a display device may improve color reproducibility and light efficiency by increasing the utilization rate of incident light by reducing incident light that may not excite quantum dots (eg, incident light that is filtered out).

[0118] It should be understood that the exemplary embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each exemplary embodiment should typically be considered as available for other similar features or aspects in other exemplary embodiments.

[0119] While the inventive concept has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the inventive concept as defined by the present disclosure.

Claims

1. A filter, wherein: The optical filter comprises: a substrate including a plurality of pixel regions spaced apart from each other and a light blocking region disposed between the plurality of pixel regions; a plurality of color filters arranged on the first surface of the substrate and corresponding to the plurality of pixel regions; a plurality of conversion layers disposed on the first surface of the substrate and corresponding to the plurality of color filters, wherein each of the plurality of conversion layers comprises at least one inclined side surface; and a reflective layer arranged on the at least one inclined side surface of each conversion layer in the plurality of conversion layers, wherein the reflective layer extends to the light blocking region and is continuously arranged on two adjacent inclined side surfaces among the inclined side surfaces of the plurality of conversion layers and the light blocking region between the two adjacent inclined side surfaces, and the reflective layer further extends from the two adjacent inclined side surfaces to a concave portion in the light blocking region between adjacent color filters among the color filters, so that the reflective layer is further arranged between opposite side surfaces of the adjacent color filters in the concave portion, The reflective layer reflects incident light that does not excite quantum dots arranged in some conversion layers among the plurality of conversion layers.

2. The optical filter according to claim 1, wherein A horizontal cross-sectional area of ​​at least one conversion layer among the plurality of conversion layers decreases in a direction away from the substrate.

3. The optical filter according to claim 1, wherein The plurality of color filters are spaced apart from each other.

4. A filter, wherein: The optical filter comprises: a substrate including a plurality of pixel regions spaced apart from each other and a light blocking region disposed between the plurality of pixel regions; a plurality of color filters arranged on the first surface of the substrate and corresponding to the plurality of pixel regions; a plurality of conversion layers disposed on the first surface of the substrate and corresponding to the plurality of color filters, wherein each of the plurality of conversion layers comprises at least one inclined side surface; and a reflective layer arranged on the at least one inclined side surface of each conversion layer in the plurality of conversion layers, wherein the reflective layer extends to the light blocking region and is continuously arranged on two adjacent inclined side surfaces among the inclined side surfaces of the plurality of conversion layers and the light blocking region between the two adjacent inclined side surfaces, Wherein, the plurality of color filters include: a first color filter; a second color filter; and The third color filter, wherein each of the plurality of color filters transmits light of a different color, and The first color filter, the second color filter, and the third color filter overlap each other in the light blocking area to form a partition wall, The reflective layer reflects incident light that does not excite quantum dots arranged in some conversion layers among the plurality of conversion layers.

5. The optical filter according to claim 4, wherein The optical filter further comprises: The planarization layer provides a planar surface by covering the plurality of conversion layers.

6. The optical filter according to claim 4, wherein The plurality of conversion layers include: First conversion layer; A second conversion layer; and The third conversion layer, Each of the plurality of conversion layers comprises scattering particles. The first conversion layer further comprises a first quantum dot, and the second conversion layer further comprises a second quantum dot, and The first quantum dot and the second quantum dot include the same material and have different sizes.

7. A display device, wherein: The display device comprises: a light emitting panel configured to emit incident light of a single color; and a filter configured to convert the incident light into light of a different color, Wherein, the optical filter comprises: a substrate including a plurality of pixel regions spaced apart from each other and a light blocking region disposed between the plurality of pixel regions; a plurality of color filters arranged on a first surface of the substrate and corresponding to the plurality of pixel regions, wherein the first surface of the substrate faces the light emitting panel; a plurality of conversion layers disposed on the first surface of the substrate and corresponding to the plurality of color filters, wherein the incident light is incident on the plurality of conversion layers; and a reflective layer arranged on the side surfaces of the plurality of conversion layers, wherein the reflective layer extends to the light blocking region and is arranged as a whole in the light blocking region on the side surfaces of the plurality of conversion layers and between the plurality of conversion layers, and the reflective layer further extends from two adjacent inclined side surfaces into a concave portion in the light blocking region between adjacent color filters in the color filters, so that the reflective layer is further arranged between opposite side surfaces of the adjacent color filters in the concave portion, The reflective layer reflects the incident light that does not excite quantum dots arranged in some conversion layers among the plurality of conversion layers.

8. The display device according to claim 7, wherein: The light emitting panel comprises: a plurality of light emitting devices configured to generate the incident light of a single color, Wherein, the light emitting devices are arranged to correspond to the plurality of pixel areas.

9. The display device according to claim 7, wherein: The light emitting panel includes a liquid crystal layer, the liquid crystal layer includes a plurality of liquid crystal molecules, and The optical filter further includes a planarization layer providing a planar surface by covering the plurality of conversion layers, Wherein, the display device further includes a polarization layer arranged between the light emitting panel and the planarization layer.

10. The display device according to claim 7, wherein: Each of the plurality of conversion layers comprises an inclined side surface, and The horizontal cross-sectional areas of the plurality of conversion layers decrease in a direction away from the substrate.

11. The display device according to claim 7, wherein: The plurality of color filters are spaced apart from each other.

12. A display device, wherein: The display device comprises: a light emitting panel configured to emit incident light of a single color; and a filter configured to convert the incident light into light of a different color, Wherein, the optical filter comprises: a substrate including a plurality of pixel regions spaced apart from each other and a light blocking region disposed between the plurality of pixel regions; a plurality of color filters arranged on a first surface of the substrate and corresponding to the plurality of pixel regions, wherein the first surface of the substrate faces the light emitting panel; a plurality of conversion layers disposed on the first surface of the substrate and corresponding to the plurality of color filters, wherein the incident light is incident on the plurality of conversion layers; and a reflective layer arranged on the side surfaces of the plurality of conversion layers, wherein the reflective layer extends to the light blocking region and is disposed entirely on the side surfaces of the plurality of conversion layers and in the light blocking region between the plurality of conversion layers, Wherein, the plurality of color filters include: a first color filter; a second color filter; and The third color filter, wherein each of the plurality of color filters transmits light of a different color, The first color filter, the second color filter, and the third color filter overlap each other in the light blocking area to form a partition wall, The reflective layer reflects incident light that does not excite quantum dots arranged in some conversion layers among the plurality of conversion layers.

13. The display device according to claim 12, wherein: The plurality of conversion layers include: First conversion layer; A second conversion layer; and The third conversion layer, Each of the plurality of conversion layers comprises scattering particles. The first conversion layer further comprises a first quantum dot, and the second conversion layer further comprises a second quantum dot, and The first quantum dot and the second quantum dot include the same material and have different sizes.

14. The display device according to claim 13, wherein: Colors of light passing through the first conversion layer, the second conversion layer, and the third conversion layer are different from each other, and a color of the light passing through the third conversion layer is the same as a color of the incident light.

15. The display device according to claim 12, wherein: The display device further includes: A low refractive index layer is disposed between the plurality of color filters and the plurality of conversion layers and has a refractive index equal to or less than 1.2.

Images