Color filter unit and display device having the same

Abstract

A color filter unit and a display apparatus including the same are provided, in which the color filter unit includes: an upper substrate; a first color filter layer, a second color filter layer, and a third color filter layer on a first surface that is a lower surface of the upper substrate; a transmission layer on the first color filter layer and having one or more protrusions in a direction away from the first surface; a second color quantum dot layer on the second color filter layer; and a third color quantum dot layer on the third color filter layer.

Description

[0001] This application is based on and claims priority under 35 U.S.C. 119 to Korean Patent Application No. 10-2020-0076761, filed on June 23, 2020, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. TECHNICAL FIELD

[0002] One or more embodiments relate to a color filter unit and a display apparatus having the same, and more particularly, to a color filter unit having improved defect rate and improved viewing angle and a display apparatus having the same. BACKGROUND

[0003] A display apparatus is an apparatus that visually displays data. The display apparatus can be used as a display unit of a small product such as a mobile phone, or can be used as a display unit of a large product such as a television.

[0004] The display apparatus includes a plurality of pixels that receive an electrical signal to emit light to display an image to the outside. Each pixel includes a light emitting element, for example, an organic light emitting display apparatus includes an organic light emitting diode (OLED) as a light emitting element. In general, the organic light emitting display apparatus includes a thin film transistor and an OLED on a substrate, and the OLED operates by emitting light by itself.

[0005] Recently, as the use of display apparatuses has diversified, various designs have been attempted to improve the quality of the display apparatuses. In particular, as the resolution of the display apparatuses has developed, research into improving the color reproducibility of each pixel of the display apparatus has been actively conducted.

[0006] In the case of a color filter unit and a display apparatus including the same in the related art, the viewing angle is narrowed due to defects in a manufacturing operation or a luminance ratio of light with respect to a front surface and a side surface.

[0007] The above information disclosed in this Background section is only for the purpose of providing an understanding of the background of the inventive concepts, and, therefore, it can contain information that is not prior art to the present application. SUMMARY

[0008] One or more embodiments provide a color filter unit having improved defect rate and improved viewing angle and a display apparatus including the same.

[0009] Additional aspects will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art by reference to the description, or can be learned by practice of the disclosed embodiments.

[0010] According to an embodiment, the color filter unit includes: an upper substrate; a first color filter layer, a second color filter layer, and a third color filter layer on a first surface that is a lower surface of the upper substrate; a transmission layer on the first color filter layer and having one or more protrusions in a direction away from the first surface; a second color quantum dot layer on the second color filter layer; and a third color quantum dot layer on the third color filter layer.

[0011] According to the present embodiment, the transmission layer can include scattering particles.

[0012] According to the present embodiment, the color filter unit can further include: a partition wall between the transmission layer and the second color quantum dot layer; and a spacer on the partition wall.

[0013] According to the present embodiment, the layer structure of the spacer can be the same as the layer structure of the transmission layer.

[0014] According to the present embodiment, the spacer can include the same material as the material of the transmission layer.

[0015] According to the present embodiment, the spacer and the transmission layer can each include scattering particles.

[0016] According to the present embodiment, the color filter unit can further include: a first protective layer between the first color filter layer and the transmission layer and covering an upper surface of the second color quantum dot layer and an upper surface of the third color quantum dot layer.

[0017] According to the present embodiment, the first protective layer can be integral throughout the entire first surface of the upper substrate.

[0018] According to the present embodiment, the second color quantum dot layer can convert light having a wavelength of a first wavelength band into light having a wavelength of a second wavelength band, and the third color quantum dot layer can convert light having a wavelength of the first wavelength band into light having a wavelength of a third wavelength band.

[0019] According to another embodiment, a display apparatus includes: a display unit including a lower substrate and first, second, and third display elements on the lower substrate; and a color filter unit including an upper substrate having a first surface that is a lower surface facing the first, second, and third display elements, wherein the color filter unit includes: first, second, and third color filter layers on the first surface of the upper substrate to be respectively laminated with the first, second, and third display elements; a transmission layer on the first color filter layer and having one or more protrusions in a direction away from the first surface; a second color quantum dot layer on the second color filter layer; and a third color quantum dot layer on the third color filter layer.

[0020] According to an embodiment, the one or more protrusions can contact the uppermost layer of the display unit.

[0021] According to the present embodiment, the transmission layer can include scattering particles.

[0022] According to an embodiment, the display unit can further include a pixel definition film between the first display element and the second display element, the color filter unit can further include a partition wall between the transmission layer and the second color quantum dot layer, and a spacer between the pixel definition film and the partition wall, and the spacer can contact the uppermost layer of the display unit.

[0023] According to the present embodiment, the layer structure of the spacer can be the same as that of the transmission layer.

[0024] According to the present embodiment, the spacer can include the same material as that of the transmission layer.

[0025] According to the present embodiment, the spacer and the transmission layer can each include scattering particles.

[0026] According to the present embodiment, the second color quantum dot layer can be between the second color filter layer and the second display element, and the third color quantum dot layer can be between the third color filter layer and the third display element.

[0027] According to the present embodiment, the color filter unit can further include a first protective layer between the first color filter layer and the transmission layer, and covering a surface of the second color quantum dot layer facing the second display element and a surface of the third color quantum dot layer facing the third display element.

[0028] According to the present embodiment, the first protective layer can be integral throughout the entire first surface of the upper substrate.

[0029] According to the present embodiment, the first display element, the second display element, and the third display element can include a first pixel electrode corresponding to the first display element, a second pixel electrode corresponding to the second display element, and a third pixel electrode corresponding to the third display element, a common electrode corresponding to the first pixel electrode, the second pixel electrode, and the third pixel electrode, and an intermediate layer between each of the first pixel electrode, the second pixel electrode, and the third pixel electrode and the common electrode, and including a first color emission layer emitting light having a wavelength of a first waveband.

[0030] Other aspects, features, and advantages will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the application.

[0031] It will be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the application as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the application, and together with the description serve to explain the principles of the application.

[0033] The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is a schematic perspective view showing a portion of a display device according to an embodiment;

[0035] Figure 2 is a schematic cross-sectional view of a portion of the display device of Figure 1

[0036] Figure 3 is a schematic layout diagram of an arrangement of pixels in the display device of Figure 1

[0037] Figure 4 is a cross-sectional view of the display device taken along line I-I' of Figure 3

[0038] Figure 5 is a schematic cross-sectional view of an example of portion A of the display device of Figure 4

[0039] Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 each show a schematic cross-sectional view of a portion of the operation of a color filter unit included in the display device of Figure 1

[0040] Figure 12 is a schematic cross-sectional view showing a portion of a display device according to another embodiment; and

[0041] Figure 13 is a schematic cross-sectional view showing a portion of a display device according to another embodiment. DETAILED DESCRIPTION

[0042] ​​​​​In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various exemplary embodiments or implementations of the present invention. As used herein, "embodiment" and "implementation" are interchangeable terms and are non-limiting examples of an apparatus or method that employs one or more of the inventive concepts disclosed herein. It will be apparent, however, that various exemplary embodiments can be practiced without these specific details, or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the various exemplary embodiments. In addition, various exemplary embodiments can be different from one another but not necessarily mutually exclusive. For example, an element or feature that, for clarity, is illustrated, discussed or described in association with one embodiment can be incorporated into or used with another embodiment.

[0043] Unless otherwise specified, exemplary embodiments shown will be understood to provide illustrative features of various details that can actually implement the inventive concepts. Thus, unless otherwise specified, features, components, modules, layers, films, panels, regions, and / or aspects, etc. (hereinafter individually or collectively referred to as "elements") of various embodiments can be additionally combined, separated, interchanged, and / or rearranged without departing from the inventive concepts.

[0044] The use of cross-hatching and / or shading in the drawings is generally provided to illustrate the boundaries, of adjacent regions or components. As such, unless specified, the presence or absence of cross-hatching and / or shading is not intended to convey or imply any preference or requirement for specific material, material properties, dimensions, ratios, commonality of elements between illustrations, and / or any other characteristic, attribute, property, etc. of the elements being presented. When exemplary embodiments can be implemented differently, a specific order in the descriptions of processes may, be different from illustrations described. For example, two consecutively described processes can be executed substantially simultaneously, or in reverse order. Additionally, the same reference numerals are used to represent the same elements.

[0045] Further, the D1 axis, the D2 axis, and the D3 axis are not limited to three axes of a rectangular coordinate system such as an x-axis, a y-axis, and a z-axis, and can be interpreted in a broader sense. For example, the D1 axis, the D2 axis, and the D3 axis can be perpendicular to each other, or can represent different directions that are not perpendicular to each other.

[0046] Spatially relative terms, such as "under", "below", "lower", "above", "upper", "on", "over", "higher", "side" (as in "sidewall"), and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientations depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. Moreover, the device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0047] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. 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. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0048] Various exemplary embodiments are described herein with reference to cross-sectional and / or exploded illustrations that are schematic illustrations of idealized embodiments and / or intermediate structures. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, the exemplary embodiments disclosed herein are not to be construed as being limited to the particular shapes of regions as illustrated and described herein but are to include deviations in shapes that result from, for example, manufacturing. In this manner, the regions illustrated in the figures can not have a specifically recited shape and can, for example, have a circular shape, a rectangular shape, or other shape depending upon the circumstances and / or manufacturing techniques. In this manner, the exemplary embodiments disclosed herein are not to be construed as being limited to the particular illustrative embodiments illustrated and described herein but are to include, for example, other shapes as would be recognized by one skilled in the art upon a complete review of the disclosure.

[0049] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein should be interpreted as consistently as possible with the meanings of the terms as would be understood by one of ordinary skill in the art and not be interpreted in an idealized or overly formal sense unless explicitly so defined herein.

[0050] Reference will now be made in detail embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present embodiments can have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the drawings, to explain aspects of the present description. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Throughout the disclosure, the expression "at least one of a, b, and c" indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0051] As the inventive concept allows for various changes and numerous embodiments, specific embodiments will be illustrated in the drawings and described in detail herein. The effects and features of the inventive concept will be apparent from the embodiments described below and the drawings, and the method of realizing the inventive concept will be apparent. However, the inventive concept can be implemented in many different ways and should not be construed as being limited to the exemplary embodiments set forth herein.

[0052] The disclosure will now be described more fully with reference to the accompanying drawings, in which embodiments of the disclosure are shown. Like reference numerals can indicate like elements throughout the drawings, and a description can be omitted.

[0053] In the following embodiments, although terms such as "first", "second", etc. can be used to describe various elements, the elements are not necessarily limited to the above terms.

[0054] In the following embodiments, an expression used in the singular includes the plural, unless it has a clearly different meaning in the context.

[0055] In the following embodiments, it will be understood that terms such as "include" and "have" are intended to indicate that there are features or elements in the inventive concept, and are not intended to exclude the possibility of additional features or elements.

[0056] It will be understood that when a layer, region, or component is referred to as being formed on another layer, region, or component, it can be directly or indirectly formed on the other layer, region, or component. That is, for example, there can be an intervening layer, region, or component.

[0057] The sizes of components in the drawings can be exaggerated for the sake of explanation. In other words, since the sizes and thicknesses of components in the drawings are arbitrarily shown for the ease of explanation, the following embodiments are not limited thereto.

[0058] When an embodiment can be implemented differently, the specific process sequence can be performed differently than the described sequence. For example, two consecutively described processes can be performed substantially simultaneously or in the reverse order of the described sequence.

[0059] In the disclosure, "A and / or B" may include "A", "B" or "A and B". In addition, "at least one of A and B (species / persons)" may include "A", "B" or "A and B".

[0060] It will be understood that when a layer, region, or component is referred to as being connected to another layer, region, or component, the layer, region, or component can be directly or indirectly connected to the other layer, region, or component. That is, for example, intermediary layers, regions, or components may exist. For example, it will be understood that when a layer, region, or component is referred to as being electrically connected to another layer, region, or component, the layer, region, or component can be directly or indirectly electrically connected to the other layer, region, or component. That is, for example, intermediary layers, regions, or components may exist.

[0061] The X, Y, and Z axes are not limited to the three axes of a Cartesian coordinate system and can be interpreted in a broader sense. For example, the X, Y, and Z axes can be perpendicular to each other, or they can represent different directions that are not perpendicular to each other.

[0062] In the inventive concept, a "pixel" refers to a "sub-pixel" that emits light of a different color from each other. For example, each pixel can be one of a blue (B) sub-pixel, a green (G) sub-pixel, and a red (R) sub-pixel.

[0063] In the following text, embodiments of the inventive concept will be described in detail with reference to the accompanying drawings.

[0064] Figure 1 This is a schematic perspective view showing a portion of the display device 1 according to an embodiment.

[0065] like Figure 1 As shown, the display device 1 according to an embodiment has a light-emitting display area DA and a non-light-emitting non-display area NDA. The lower substrate 100 may include the display area DA and the non-display area NDA.

[0066] Despite Figure 1 The image shows a display device 1 in which the display area DA has a rectangular shape, but the shape of the display area DA can include any shape such as a circle, an ellipse, a polygon, etc.

[0067] Hereinafter, the display apparatus 1 according to an embodiment is described as an example of an organic light emitting display apparatus, but the display apparatus 1 is not limited thereto. The display apparatus 1 can be an inorganic light emitting display apparatus, a quantum dot light emitting display apparatus, or the like. For example, an emission layer of a display element in the display apparatus 1 can include an organic material, an inorganic material, a quantum dot, an organic material and a quantum dot, an inorganic material and a quantum dot, or an organic material and an inorganic material and a quantum dot.

[0068] The pixel P can be positioned at a point where a scan line (not shown) extending in a Y-axis direction and a data line (not shown) extending in an X-axis direction intersect in the display area DA. Each pixel P can include a pixel circuit connected to the scan line and the data line, and an organic light emitting diode as a first to third display elements connected to the pixel circuit.

[0069] Figure 2 is Figure 1 a schematic cross-sectional view of a portion of the display apparatus 1.

[0070] As Figure 2 indicated in FIG. 1A, the display apparatus 1 according to an embodiment can have a display unit 10 and a color filter unit 20.

[0071] The display unit 10 includes a lower substrate 100. First to third pixels PX1 to PX3 can be arranged on the lower substrate 100 of the display unit 10. Each of the first to third pixels PX1 to PX3 can be a pixel that emits light of a different color from each other on the lower substrate 100. For example, the first pixel PX1 can emit light of a first color (e.g., blue), the second pixel PX2 can emit light of a second color (e.g., green), and the third pixel PX3 can emit light of a third color (e.g., red). To this end, the first pixel PX1 can include a first display element, the second pixel PX2 can include a second display element, and the third pixel PX3 can include a third display element.

[0072] The color filter unit 20 includes an upper substrate 400. First to third color filter units 310 to 330 can be positioned on a first surface that is a lower surface of the upper substrate 400 of the color filter unit 20.

[0073] The color filter unit 20 can be separately manufactured by directly forming the first to third color filter units 310, 320, and 330 on the first surface which is the lower surface of the upper substrate 400. At this time, a direction in which the upper substrate 400 is arranged in the operation of manufacturing the color filter unit 20 is not limited. In other words, the color filter unit 20 can be manufactured by forming the first to third color filter units 310, 320, and 330 on the first surface in a state in which the first surface which is the lower surface of the upper substrate 400 is arranged to face downward (arranged to face the -Z axis direction), or can be manufactured by forming the first to third color filter units 310, 320, and 330 on the first surface in a state in which the first surface which is the lower surface of the upper substrate 400 is arranged to face upward (arranged to face the +Z axis direction).

[0074] Hereinafter, a detailed description will be made with reference to Figures 4 to 13 with respect to the structure of the display unit 10 and the color filter unit 20.

[0075] The display apparatus 1 can be manufactured by combining the display unit 10 and the color filter unit 20 such that the first to third color filter units 310, 320, and 330 correspond to the first to third pixels PX1 to PX3, respectively. At this time, the color filter unit 20 can be arranged above the display unit 10. In detail, the color filter unit 20 can be arranged such that the first to third color filter units 310 to 330 overlap and are positioned above the first to third display elements of the display unit 10.

[0076] In an embodiment, the display apparatus 1 can further include an adhesive layer 30 which is arranged between the display unit 10 and the color filter unit 20 and is configured to assist the combination of the display unit 10 and the color filter unit 20. For example, the adhesive layer 30 can include an optically clear adhesive (OCA), but is not limited thereto. In addition, the adhesive layer 30 can include a filler (not shown). The filler can be positioned between the display unit 10 and the color filter unit 20 and serve as a buffer against external pressure or the like. The filler can include an organic material such as methyl silicone resin, phenyl silicone resin, polyimide, polyurethane resin, epoxy resin, acrylic resin, or the like as an organic sealant or silicone or the like as an inorganic sealant, but is not limited thereto. In an optional embodiment, the adhesive layer 30 can be omitted.

[0077] Figure 3 is a schematic layout view of an arrangement of pixels in the display apparatus 1 of Figure 1

[0078] ​The display apparatus 1 according to the embodiment can include one or more pixels in a unit pixel area. The "unit pixel area" is an area in which a pixel group including one or more pixels is arranged, and can be repeatedly or periodically positioned in the display area DA. The size, number, shape, and arrangement of the unit pixel area and the size, number, shape, and arrangement of the pixels positioned in the unit pixel area can be variously modified and are not limited.

[0079] As a specific example, as shown in FIG. 1A, the display apparatus 1 can include a plurality of unit pixel areas, and a pixel group including the first to third pixels PX1 to PX3 can be positioned in each of the plurality of unit pixel areas. This is merely an example, and the display apparatus 1 can include more or less pixels. The first to third display elements of the display unit 10 and the first to third color filter units 310 to 330 of the color filter unit 20 can be included in the first to third pixels PX1 to PX3, respectively. The first to third display elements correspond to the first to third color filter units 310 to 330 when viewed in a direction (Z-axis direction) perpendicular to the lower substrate 100 or the upper substrate 400. In detail, the first color filter unit 310 can overlap the first pixel electrode 211 of the first display element, the second color filter unit 320 can overlap the second pixel electrode 213 of the second display element, and the third color filter unit 330 can overlap the third pixel electrode 215 of the third display element when viewed in the direction (Z-axis direction) perpendicular to the lower substrate 100 or the upper substrate 400. Figure 3

[0080] Although the first to third pixels PX1 to PX3 are shown as being adjacent to each other, the inventive concept is not limited thereto. In other words, other components such as other lines can be arranged between the first to third pixels PX1 to PX3. Thus, for example, the first pixel PX1 and the second pixel PX2 can not be positioned as pixels adjacent to each other. In addition, the first to third pixels PX1 to PX3 can not be positioned in the same direction. Figures 2 to 13 Figures 2 to 13

[0081] Figure 4 is a cross-sectional view of the display apparatus 1 taken along the line I-I' of FIG. 1A. Figure 3

[0082] The display apparatus 1 according to the embodiment can include a display unit 10, a color filter unit 20, and a bonding layer 30.

[0083] ​​​​The display unit 10 includes a lower substrate 100. The lower substrate 100 can include a glass material, a metal material, a ceramic material, or a material having a flexible or bendable property. When the lower substrate 100 has a flexible or bendable property, the lower substrate 100 can include, for example, a polymer resin such as polyether sulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose acetate propionate. The lower substrate 100 can have a single layer or a multi-layer structure including the above-described material. In the case of a multi-layer structure, the lower substrate 100 can include a multi-layer structure including two layers including a polymer resin and a barrier layer disposed between the two layers, the barrier layer including an inorganic material (silicon oxide, silicon nitride, silicon oxynitride, etc.), and various modifications can be made.

[0084] A buffer layer 101 can be formed on the lower substrate 100. The buffer layer 101 can include an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride, etc., and can include a single layer or a multi-layer structure. The buffer layer 101 can increase the smoothness of the upper surface of the lower substrate 100, or can prevent or minimize the penetration of impurities or moisture, etc. from the outside of the lower substrate 100 into the semiconductor layer 121 of the thin film transistor 120.

[0085] A pixel circuit can be positioned on the buffer layer 101, and a display element layer including first to third display elements electrically connected to the pixel circuit can be positioned on the pixel circuit. In addition, the pixel circuit can include the thin film transistor 120 and a capacitor Cst. The first to third display elements electrically connected to the pixel circuit can be understood as the first to third pixel electrodes 211, 213, and 215 of the first to third display elements electrically connected to the thin film transistor 120.

[0086] The thin film transistor 120 can include a semiconductor layer 121 including amorphous silicon, polycrystalline silicon, or an organic semiconductor material, a gate electrode 123, a source electrode 125, and a drain electrode 127.

[0087] The semiconductor layer 121 can be positioned on the buffer layer 101, and can include amorphous silicon or polycrystalline silicon. As a specific example, the semiconductor layer 121 can include an oxide of one or more materials selected from a group including indium (In), gallium (Ga), tin (Sn), zirconium (Zr), vanadium (V), hafnium (Hf), cadmium (Cd), germanium (Ge), chromium (Cr), titanium (Ti), aluminum (Al), cesium (Cs), cerium (Ce), and zinc (Zn). In addition, the semiconductor layer 121 can include a zinc oxide-based material, and can include a Zn oxide, an In-Zn oxide, a Ga-In-Zn oxide, or the like. In addition, the semiconductor layer 121 can include an In-Ga-Zn-O (IGZO), an In-Sn-Zn-O (ITZO), or an In-Ga-Sn-Zn-O (IGTZO) semiconductor including a metal such as In, Ga, Sn in ZnO. The semiconductor layer 121 can include a channel region, and a source region and a drain region arranged on both sides of the channel region, respectively.

[0088] The gate electrode 123 can be positioned above the semiconductor layer 121 to be superposed with at least a portion of the semiconductor layer 121. The gate electrode 123 can include various conductive materials including molybdenum (Mo), Al, copper (Cu), Ti, or the like, and can have various layer structures. For example, the gate electrode 123 can include a Mo layer and an Al layer, or can have a multi-layer structure of Mo / Al / Mo.

[0089] The source electrode 125 and the drain electrode 127 can also include various conductive materials including Mo, Al, Cu, Ti, or the like, and can have various layer structures. For example, the source electrode 125 and the drain electrode 127 can include a Ti layer and an Al layer, or can include a multi-layer structure of Ti / Al / Ti. The source electrode 125 and the drain electrode 127 can be connected to the source region or the drain region of the semiconductor layer 121 through a contact hole.

[0090] In order to secure insulation between the semiconductor layer 121 and the gate electrode 123, a gate insulating layer 103 including an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride, or the like can be arranged between the semiconductor layer 121 and the gate electrode 123. In addition, a first interlayer insulating layer 105 can be positioned on the gate electrode 123 as a layer having a certain dielectric constant, and the first interlayer insulating layer 105 can be an insulating layer including an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride, or the like. The source electrode 125 and the drain electrode 127 can be positioned on the first interlayer insulating layer 105. The insulating layer (film) including an inorganic material can be formed by chemical vapor deposition (CVD), atomic layer deposition (ALD), or the like. The above description can be similarly applied to the embodiments to be described below and modified examples thereof.

[0091] The capacitor Cst can include a first electrode CE1 and a second electrode CE2. The first electrode CE1 is superposed with the second electrode CE2 with the first interlayer insulating layer 105 therebetween to form a capacitor. In this case, the first interlayer insulating layer 105 serves as a dielectric layer of the capacitor Cst.

[0092] The first electrode CE1 can be positioned on the same layer as the gate electrode 123. The first electrode CE1 and the gate electrode 123 can include the same material, and can include, for example, various conductive materials including Mo, Al, Cu, Ti, etc., and can have various layer structures (e.g., a multi-layer structure of Mo / Al / Mo, etc.). The second electrode CE2 can be positioned on the same layer as the source electrode 125 and the drain electrode 127. The second electrode CE2 can include the same material as the material of the source electrode 125 and the drain electrode 127, and can include, for example, various conductive materials including Mo, Al, Cu, Ti, etc., and can have various layer structures (e.g., a multi-layer structure of Ti / Al / Ti).

[0093] The planarization layer 109 can be positioned on the thin film transistor 120. When an organic light emitting diode is positioned on the thin film transistor 120 as an example of the first to third display elements, the planarization layer 109 can substantially planarize an upper portion of the passivation film 107 covering the thin film transistor 120. The planarization layer 109 can include, for example, benzocyclobutene (BCB), polyimide, hexamethyldisiloxane (HDMSO), a general commercial polymer such as poly(methyl methacrylate) (PMMA) or polystyrene (PS), a polymer derivative having a phenol group, an acrylic polymer, an imide polymer, an aryl ether polymer, an amide polymer, a fluorine polymer, a p-xylene polymer, a vinyl alcohol polymer, and a mixture thereof. For convenience, the planarization layer 109 is shown as a single layer in Figure 4 、 Figure 12 and Figure 13 but can include multiple layers, and various modifications can be made.

[0094] The first to third display elements can be positioned on the planarization layer 109. The first to third display elements can be organic light emitting diodes having first to third pixel electrodes 211, 213, and 215, a counter electrode 230, and an intermediate layer 220 disposed between the first to third pixel electrodes 211, 213, and 215 and the counter electrode 230 and including an emission layer.

[0095] As an example, the first to third display elements can include first to third pixel electrodes 211 to 215, a counter electrode 230 corresponding to the first to third pixel electrodes 211 to 215, and an intermediate layer 220 disposed between the first to third pixel electrodes 211 to 215 and the counter electrode 230. In addition, the intermediate layer 220 can include a first color emission layer that emits light having a wavelength of a first waveband. For example, the first waveband can be about 450 nm to about 495 nm, and the first color can be blue, but is not limited thereto.

[0096] The first to third pixel electrodes 211, 213, and 215 of the first to third display elements can be electrically connected to the thin film transistor 120 by contacting any one of the source electrode 125 and the drain electrode 127 through an opening portion (contact hole) formed in the planarization layer 109 or the like. The first to third pixel electrodes 211, 213, and 215 can be (semi-)transparent electrodes or reflective electrodes. In some embodiments, the first to third pixel electrodes 211, 213, and 215 can include a reflective layer including silver (Ag), magnesium (Mg), Al, platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), or a mixture thereof, and a transparent or semi-transparent electrode layer on the reflective layer. The transparent or semi-transparent electrode layer can include at least one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO), and aluminum zinc oxide (AZO). In addition, the first to third pixel electrodes 211, 213, and 215 can have a stack structure of ITO / Ag / ITO.

[0097] The pixel defining film 110 can be positioned on the planarization layer 109. The pixel defining film 110 can define a pixel (or an emission area) by having an opening corresponding to each sub-pixel. At this time, the opening can be formed to expose at least a portion of a central portion of the first to third pixel electrodes 211, 213, and 215. For example, the pixel defining film 110 can be positioned between the first and second display elements, between the second and third display elements, and between the first and third display elements.

[0098] The pixel defining film 110 can prevent the generation of an arc or the like at the edges of the first to third pixel electrodes 211, 213, and 215 by increasing the distance between the edges of the first to third pixel electrodes 211, 213, and 215 and the counter electrode 230 above the first to third pixel electrodes 211, 213, and 215. The pixel defining film 110 can include one or more organic insulating materials selected from the group consisting of polyamide, polyimide, acrylic resin, BCB, and phenol resin, and can be formed by a spin coating method or the like.

[0099] The intermediate layer 220 of the first to third display elements can include a low molecular weight material or a polymer material. When the intermediate layer 220 includes a low molecular weight material, the intermediate layer 220 can include a structure in which a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), an electron injection layer (EIL), or the like are stacked in a single or complex structure, and can be formed by a vacuum deposition method. When the intermediate layer 220 includes a polymer material, the intermediate layer 220 can have a structure including an HTL and an EML. The HTL can include poly(3,4-ethylenedioxythiophene) (PEDOT), and the EML can include a polymer material such as poly(p-phenylenevinylene) (PPV), polyfluorene, or the like. The intermediate layer 220 can be formed by a screen printing method, an inkjet printing method, a vapor deposition method, a laser-induced thermal imaging (LITI) method, or the like. The intermediate layer 220 is not limited thereto, and can have various structures.

[0100] As described above, the intermediate layer 220 can include a single layer extending throughout the first to third pixel electrodes 211, 213, and 215 of the first to third display elements, but according to another embodiment, the intermediate layer 220 can include layers patterned to correspond to each of the first to third pixel electrodes 211, 213, and 215. In any case, the intermediate layer 220 includes a first color emission layer. The first color emission layer can be integral throughout the first to third pixel electrodes 211, 213, and 215, while according to another embodiment, the first color emission layer can be patterned to correspond to each of the first to third pixel electrodes 211, 213, and 215. The first color emission layer can emit light having a wavelength of a first waveband, for example, can emit light having a wavelength of about 450 nm to about 495 nm.

[0101] The counter electrode 230 of the first to third display elements is positioned in the display area. As a specific example, the counter electrode 230 can include a single layer that covers the entire surface of the display area and can be disposed in the display area. In other words, the counter electrode 230 can be integrally formed throughout the plurality of first to third display elements to correspond to the plurality of first to third pixel electrodes 211, 213, and 215. At this time, the counter electrode 230 can be formed to cover the display area and extend to a portion of the non-display area outside the display area. As another example, the counter electrode 230 can be formed by being patterned to correspond to each of the plurality of first to third pixel electrodes 211, 213, and 215.

[0102] The counter electrode 230 can be a transparent electrode or a reflective electrode. In some embodiments, the counter electrode 230 can be a transparent or semi-transparent electrode and include a metal thin film having a small work function and containing lithium (Li), calcium (Ca), lithium fluoride LiF, Al, Ag, Mg, and a composite thereof. In addition to the metal thin film, a transparent conductive oxide (TCO) film such as ITO, IZO, ZnO, or In2O3 can also be included.

[0103] Since the organic light emitting diode can be easily damaged by moisture or oxygen from the outside, etc., the organic light emitting diode can be covered and protected by the encapsulation layer 130. The encapsulation layer 130 includes at least one organic encapsulation layer and at least one inorganic encapsulation layer. For example, the encapsulation layer 130 can include a first inorganic encapsulation layer 131, an organic encapsulation layer 133, and a second inorganic encapsulation layer 135.

[0104] The first inorganic encapsulation layer 131 can cover the counter electrode 230 and can include silicon oxide, silicon nitride, and / or silicon oxynitride, etc. Other layers (not shown) such as a cap layer, etc. can be positioned between the first inorganic encapsulation layer 131 and the counter electrode 230. Since the first inorganic encapsulation layer 131 is formed along the structure thereunder, the upper surface of the first inorganic encapsulation layer 131 is not formed to be flat. Accordingly, the organic encapsulation layer 133 is formed to cover the first inorganic encapsulation layer 131. The organic encapsulation layer 133 has an approximately flat upper surface. Accordingly, the encapsulation layer 130 can have a flat upper surface by including the organic encapsulation layer 133. The organic encapsulation layer 133 can include one or more materials selected from a group including polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyformaldehyde, polyarylate, and hexamethyldisiloxane. The second inorganic encapsulation layer 135 can cover the organic encapsulation layer 133 and can include silicon oxide, silicon nitride, silicon oxynitride, etc.

[0105] According to the above-described multi-layer structure, even when a crack occurs in the encapsulation layer 130, the encapsulation layer 130 can prevent the crack from being connected between the first inorganic encapsulation layer 131 and the organic encapsulation layer 133 or between the organic encapsulation layer 133 and the second inorganic encapsulation layer 135. Accordingly, the formation of a path through which external moisture or oxygen, etc. can penetrate can be prevented or minimized.

[0106] The color filter unit 20 includes an upper substrate 400. First to third color filter units 310 to 330 corresponding to the first to third pixels PX1 to PX3 are positioned on a first surface of the upper substrate 400. In this case, the "first surface" refers to a surface (lower surface) facing the display unit 10 when the color filter unit 20 is disposed above the display unit 10. The first to third color filter units 310 to 330 can be positioned to be superposed with the first to third pixel electrodes 211 to 215 or the emission layers of the first to third display elements when viewed in a direction (Z-axis direction) perpendicular to the lower substrate 100 of the display unit 10 or the upper substrate 400 of the color filter unit 20. Accordingly, the first to third color filter units 310 to 330 can filter light emitted from each of the first to third display elements.

[0107] The first to third color filter units 310 to 330 can include first to third color filter layers 311 to 331 positioned on the first surface which is a lower surface of the upper substrate 400, a transmissive layer 313 positioned above the first color filter layer 311, a second color quantum dot layer 323 positioned above the second color filter layer 321, and a third color quantum dot layer 333 positioned above the third color filter layer 331.

[0108] In detail, the first color filter unit 310 can include the first color filter layer 311 and the transmissive layer 313, the second color filter unit 320 can include the second color filter layer 321 and the second color quantum dot layer 323, and the third color filter unit 330 can include the third color filter layer 331 and the third color quantum dot layer 333.

[0109] The first color filter layer 311 can allow only light having a wavelength of about 450 nm to about 495 nm to pass, the second color filter layer 321 can allow only light having a wavelength of about 495 nm to about 570 nm to pass, and the third color filter layer 331 can allow only light having a wavelength of about 630 nm to about 780 nm to pass. The first to third color filter layers 311 to 331 can reduce external light reflection in the display apparatus 1.

[0110] For example, when external light reaches the first color filter layer 311, only light having a predetermined wavelength as described above passes through the first color filter layer 311, and light of other wavelengths is absorbed by the first color filter layer 311. Accordingly, among external light incident on the display apparatus 1, only light having a predetermined wavelength as described above passes through the first color filter layer 311, and a portion of the light passing through the first color filter layer 311 is reflected by the counter electrode 230 or the first pixel electrode 211 of the first display element under the first color filter layer 311 and re-emitted to the outside. As a result, because only a portion of the external light incident on a position where the first pixel PX1 is positioned is reflected to the outside, the first color filter layer 311 can reduce external light reflection. The above description can be applied in the same manner to the second color filter layer 321 and the third color filter layer 331.

[0111] The second color quantum dot layer 323 can convert light having a wavelength of a first waveband generated in the intermediate layer 220 of the second display element into light having a wavelength of a second waveband. For example, when light having a wavelength of about 450 nm to about 495 nm is generated in the intermediate layer 220 of the second display element, the second color quantum dot layer 323 can convert the light into light having a wavelength of about 495 nm to about 570 nm. Accordingly, light having a wavelength of about 495 nm to about 570 nm is emitted to the outside from the second pixel PX2.

[0112] The third color quantum dot layer 333 can convert light having a wavelength of a first waveband generated in the intermediate layer 220 of the third display element into light having a wavelength of a third waveband. For example, when light having a wavelength of about 450 nm to about 495 nm is generated in the intermediate layer 220 of the third display element, the third color quantum dot layer 333 can convert the light into light having a wavelength of about 630 nm to about 780 nm. Accordingly, light having a wavelength of about 630 nm to about 780 nm is emitted to the outside from the third pixel PX3.

[0113] Each of the second color quantum dot layer 323 and the third color quantum dot layer 333 can have a configuration in which quantum dots are dispersed in a resin.

[0114] The quantum dot can have a size of several nanometers, and the wavelength of the converted light varies according to the particle diameter of the quantum dot. In other words, the quantum dot can control the color of the emitted light according to the particle diameter of the quantum dot, and thus, the quantum dot can have various emission colors such as blue, red, green, etc. The particle diameter of the quantum dot can have a full width at half maximum (FWHM) of an emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, and more preferably about 30 nm or less. Color purity and color reproducibility can be improved within the above range. In addition, since light emitted by the quantum dot is emitted in all directions, the viewing angle of the light can be improved. In addition, the form of the quantum dot can be a form commonly used in the art, and is not particularly limited, and more specifically, the form of the quantum dot can include a spherical shape, a pyramid shape, a multi-arm shape, or a cubic nanoparticle, a nanotube, a nanowire, a nanofiber, a plate-like nanoparticle (nanoplatelet, or referred to as a nanoplate), etc. In addition, the quantum dot can include a semiconductor material such as cadmium sulfide (CdS), cadmium telluride (CdTe), zinc sulfide (AnS), indium phosphide (InP), etc.

[0115] The resin included in the second color quantum dot layer 323 and the third color quantum dot layer 333 can be any material as long as it is a transparent material. For example, a polymer resin such as silicone resin, epoxy resin, acrylic, BCB, HMDSO, etc. can be used as a material for forming the second color quantum dot layer 323 and the third color quantum dot layer 333.

[0116] The first color filter unit 310 can not include a quantum dot layer, and can include a transmission layer 313. For example, the display unit 10 can include an intermediate layer 220 disposed between the first to third pixel electrodes 211 to 215 of the first to third display elements and the counter electrode 230, and including a first color emission layer emitting light having a wavelength of a first waveband. In this case, light having a wavelength of the first waveband generated in the intermediate layer 220 is emitted to the outside from the first pixel PX1 without wavelength conversion. Thus, since a quantum dot layer can not be used in the first pixel PX1, the first color filter unit 310 can include the transmission layer 313 including a transparent resin instead of the quantum dot layer.

[0117] As an example, the transmission layer 313 can have one or more protrusions PR in a direction away from the first surface of the upper substrate 400. When the display unit 10 and the color filter unit 20 are combined, the protrusions PR of the transmission layer 313 can serve as a support. That is, the protrusions PR of the transmission layer 313 can maintain and support the distance between the display unit 10 and the color filter unit 20 at a certain distance. To this end, the protrusions PR can be formed so that the end portions of the protrusions PR are positioned in a position farthest from the first surface of the upper substrate 400, and can contact the uppermost layer of the display unit 10 when the color filter unit 20 is disposed on the display unit 10.

[0118] Preferably, the protrusions PR of the transmission layer 313 have a small brittleness and a certain degree of elasticity so as not to be broken when an external force is applied. For example, the transmission layer 313 can include a polymer resin such as silicone resin, epoxy resin, acrylic, BCB, HMDSO, or the like. In an alternative embodiment, the transmission layer 313 can include scattering particles, and a detailed description of the transmission layer 313 will be described below with reference to FIG. 6. Figure 5 A detailed description of the transmission layer 313 will be described below with reference to FIG. 6.

[0119] According to the embodiments described herein, it is desirable to prevent the second color quantum dot layer 323 and the third color quantum dot layer 333 from being damaged in a manufacturing operation or in a use operation after the manufacturing operation. To this end, the color filter unit 20 can further include a first protective layer IL1 disposed between the first color filter layer 311 and the transmission layer 313 and covering the upper surface of the second color quantum dot layer 323 and the upper surface of the third color quantum dot layer 333. In other words, the first protective layer IL1 can be formed to be disposed between the first color filter layer 311 and the transmission layer 313 and cover the surface of the second color quantum dot layer 323 facing the second display element and the surface of the third color quantum dot layer 333 facing the third display element.

[0120] When the quantum dots in the second color quantum dot layer 323 are damaged, the second color quantum dot layer 323 can not be able to convert the light of the first waveband into the light of the second waveband. Accordingly, according to the embodiments described herein, it is desirable to prevent the quantum dots in the second color quantum dot layer 323 from being damaged by outgassing generated from the second color filter layer 321. Similarly, when the quantum dots in the third color quantum dot layer 333 are damaged, the third color quantum dot layer can not be able to convert the light of the first waveband into the light of the third waveband. Accordingly, according to the embodiments described herein, it is desirable to prevent the quantum dots in the third color quantum dot layer 333 from being damaged by outgassing generated from the third color filter layer 331. To this end, the second protective layer IL2 can be disposed between the second color filter layer 321 and the second color quantum dot layer 323, and can also be disposed between the third color filter layer 331 and the third color quantum dot layer 333.

[0121] The first protective layer IL1 can include an inorganic material such as silicon oxide, silicon nitride, or silicon oxynitride to block passage of gas. In addition, the first protective layer IL1 can include an organic material including one or more materials selected from the group including polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylenesulfonate, polyformal, polyarylate, and HMDSO.

[0122] Further, the first protective layer IL1 can be integral throughout the entire first surface of the upper substrate 400.

[0123] In the display device 1 according to the present embodiment, light of the first waveband is emitted from the first pixel PX1 to the outside, light of the second waveband is emitted from the second pixel PX2 to the outside, and light of the third waveband is emitted from the third pixel PX3 to the outside. Thus, the display device 1 according to the present embodiment can display a full-color image.

[0124] Figure 5 is a portion A of Figure 4 a schematic cross-sectional view of an example of the display device 1.

[0125] As shown in Figure 5 , the transmission layer 313 included in the first color filter unit 310 of the color filter unit 20 according to the embodiment can include scattering particles SP.

[0126] The scattering particles SP can reduce the luminance ratio of light emitted from the front surface of a pixel to light emitted from the side surface of the pixel. In each pixel, since light generated from a display element is emitted to the outside through the color filter unit, the luminance of the light with respect to the front surface is high, and the luminance of the light with respect to the side surface is relatively low, and thus the luminance ratio of the light with respect to the front surface and the side surface is generated. As a result, a decrease in performance of the display device, such as a reduced viewing angle, an erroneous color coordinate, and the like, can occur. Since the transmission layer 313 includes scattering particles to allow light passing through the transmission layer 313 to be scattered by the scattering particles SP, the color filter unit 20 or the display device 1 according to the embodiment can reduce the luminance ratio of the light with respect to the front surface and the side surface.

[0127] For example, the scattering particles SP can be titanium oxide (TiO2), metal particles, or the like. In addition, the transmission layer 313 can be a photosensitive polymer in which the scattering particles SP are dispersed. At this time, the photosensitive polymer can include an organic material having light transmittance, such as a silicone resin, an epoxy resin, or the like.

[0128] Figures 6 to 11 Each shows a schematic cross-sectional view of a portion of the operation of the color filter unit 20 included in the display device 1. Figure 1

[0129] As shown in Figure 6 ​As shown in FIG. 1, the first color filter layer 311 to the third color filter layer 331 are formed on the first surface of the upper substrate 400.

[0130] Specifically, the second partition walls B2 are formed on the first surface of the upper substrate 400. The second partition walls B2 can be arranged to be separated from each other on the first surface of the upper substrate 400, and can define the first color region to the third color region. In other words, the second partition walls B2 define the first color region to the third color region in the separation region between adjacent second partition walls B2, and the first color region to the third color region correspond to the first pixel PX1 to the third pixel PX3.

[0131] The second partition walls B2 can be patterned to correspond to the non-emission region of the display unit 10 to serve as a light blocking layer when the display unit 10 and the color filter unit 20 are combined. In other words, light can be emitted from the display element layer of the display unit 10 to the outside only through the first color region to the third color region, which are regions (hereinafter, referred to as separation regions) in which the second partition walls B2 are not positioned.

[0132] The second partition walls B2 can include a material (a photoresist) that causes a chemical change when irradiated with light. For example, the second partition walls B2 can include an aromatic diazide, a methacrylate, a cinnamate, etc. as a negative type photoresist, and can include poly(methyl methacrylate), naphthoquinone diazide, polybutene-1-sulfone, etc. as a positive type photoresist, but are not limited thereto. In addition, in an alternative embodiment, the second partition walls B2 can include a black matrix, a black pigment, a metal material, etc. to serve as a light blocking layer, and can include a material (such as Al, Ag, etc.) having reflectivity to improve light efficiency.

[0133] The first color filter layer 311 to the third color filter layer 331 are formed between the second partition walls B2 to correspond to the first pixel PX1 to the third pixel PX3. For example, the first color filter layer to the third color filter layer 311, 321, and 331 can be formed by an inkjet operation, but are not limited thereto.

[0134] A second protection layer IL2 can be formed on the first color filter layer to the third color filter layer 311, 321, and 331 to cover the second partition walls B2 and the first color filter layer to the third color filter layer 311, 321, and 331. For example, the second protection layer IL2 can include a material such as silicon oxide, silicon nitride, silicon oxynitride, etc. as an inorganic insulating material having light transmissivity.

[0135] Subsequently, as shown in FIG. 1, the first color filter layer 311 to the third color filter layer 331 are formed on the first surface of the upper substrate 400. Figure 7As shown in FIG. 6, the first separation wall B1 is formed on the second protective layer IL2 to correspond to the second separation wall B2. In other words, when viewed in a direction perpendicular to the upper substrate 400 (Z-axis direction), the first separation wall B1 is positioned on the second separation wall B2 to be superimposed with the second separation wall B2. In addition, the first separation wall B1 can be superimposed with a portion of the color filter layer adjacent thereto.

[0136] The first separation wall B1 can include the same material as that of the second separation wall B2. For example, the first separation wall B1 can include an aromatic diazide, a methacrylate, a cinnamate, or the like as a negative photoresist, and can include poly(methyl methacrylate), naphthoquinonediazide, polybutene-1-sulfone, or the like as a positive photoresist.

[0137] Then, as shown in FIG. 7, a second color quantum dot layer 323 and a third color quantum dot layer 333 are formed in the separation regions between the first separation walls B1 with respect to the second color region and the third color region. In other words, the second color quantum dot layer 323 is formed to be superimposed with the second color filter layer 321 of the second color region, and the third color quantum dot layer 333 is formed to be superimposed with the third color filter layer 331 of the third color region. For example, the second color quantum dot layer 323 and the third color quantum dot layer 333 can be formed by an inkjet operation, but are not limited thereto. Figure 8 Next, as shown in FIG. 8, a first protective layer IL1 is formed to be integral over the entire first surface of the upper substrate 400 to cover the first separation wall B1 as well as the second color quantum dot layer 323 and the third color quantum dot layer 333. At this time, the first protective layer IL1 is formed to be in contact with the second protective layer IL2 in the first color region in which the quantum dot layer is not formed. For example, the first protective layer IL1 can include a material such as silicon oxide, silicon nitride, silicon oxynitride, or the like as an inorganic insulating material having light transmittance.

[0138] Figure 9 Subsequently, as shown in FIG. 9, a transparent material layer TR as a layer including a transparent material is formed on the first protective layer IL1 over the entire first surface of the upper substrate 400. In other words, the transparent material layer TR including a transparent material can be formed over the entire first surface of the upper substrate 400 and then the transparent material layer TR is patterned by using a mask to form the transmission layer 313 (in

[0139] Subsequently, as shown in FIG. 9, a transparent material layer TR as a layer including a transparent material is formed on the first protective layer IL1 over the entire first surface of the upper substrate 400. In other words, the transparent material layer TR including a transparent material can be formed over the entire first surface of the upper substrate 400 and then the transparent material layer TR is patterned by using a mask to form the transmission layer 313 (in Figure 10 Figure 4 Figure 12 Figure 13 ​​​​The transmission layer 313 is formed separately from the second color quantum dot layer 323 to the third color quantum dot layer 333 using a mask operation instead of an inkjet operation, as described above, and thus, a defect rate such as a color mixing defect that can occur during the inkjet operation in forming the second color quantum dot layer 323 to the third color quantum dot layer 333 can be significantly reduced.

[0140] The transmission layer 313 can include an organic material such as a polymeric resin such as silicone resin, epoxy resin, acrylic, BCB, HMDSO, etc. The organic material has a planarization characteristic, and it is desirable to adjust the flatness of the transparent material layer TR so that the transmission layer 313 includes the protrusion PR. For example, the composition ratio, viscosity, etc. of the material included in the transparent material layer TR can be adjusted, but are not limited thereto. In addition, as described above, the transparent material layer TR can include the scattering particles SP.

[0141] Next, as shown in FIG. 3B, the transparent material layer TR is patterned into the transmission layer 313 by using a mask. Figure 11

[0142] In detail, a photosensitive film (not shown) is formed on the transparent material layer TR, and the photosensitive film is patterned to form a photosensitive film pattern corresponding to the pattern of the transmission layer 313 by using a mask (not shown), and then the transparent material layer TR is patterned.

[0143] At this time, the mask can refer to a mask assembly including a frame having one or more opening portions and a mask having one or more openings (opening regions) formed according to a certain pattern. In addition, according to an example embodiment, a half-tone mask can be used.

[0144] Further, the photosensitive film can include a material (a photoresist) that causes a chemical change when light is irradiated. For example, the photosensitive film can include an aromatic diazide, a methacrylate, a cinnamate, etc. as a negative type photoresist, and can include poly(methyl methacrylate), naphthoquinone diazide, polybutene-1-sulfone, etc. as a positive type photoresist, but is not limited thereto.

[0145] ​The transmission layer 313 formed as described above can include one or more protrusions PR, and the number, shape, height, position, etc. of the protrusions PR are not limited. For example, the protrusions PR can be formed on one or more of the adjacent first partition walls B1. In other words, the transmission layer 313 can be laminated with the first color filter layer 311, laminated with one or more of the adjacent first partition walls B1, have a curved shape and a shape in which a certain portion protrudes. For example, the transmission layer 313 can have a shape having a lowest point at a portion laminated with a central portion of the first color filter layer 311 and a highest point at a certain position of a portion laminated with the second partition wall B2, in which the shape becomes higher in a direction away from the central portion of the first color filter layer 311 and the height decreases again after the highest point.

[0146] Figure 12 FIG. 7 is a schematic cross-sectional view illustrating a portion of a display apparatus according to another embodiment.

[0147] For example, as shown in FIG. 7, the protrusions PR of the transmission layer 313 can be positioned only above one of the adjacent first partition walls B1 on a cross-sectional view. Figure 12

[0148] Figure 13 FIG. 8 is a schematic cross-sectional view illustrating a portion of a display apparatus 1 according to another embodiment.

[0149] The color filter unit 20 or the display apparatus 1 can further include a spacer 340. The spacer 340 can function as a support similar to the protrusions PR of the transmission layer 313 described above. In other words, the spacer 340 can maintain the distance between the display unit 10 and the color filter unit 20 to be above a certain distance.

[0150] The spacer 340 can be positioned above the first partition wall B1 of the color filter unit 20. When the display unit 10 and the color filter unit 20 are combined, the spacer 340 can be disposed between the pixel defining film 110 of the display unit 10 and the first partition wall B1 of the color filter unit 20. At this time, the spacer 340 can contact the uppermost layer of the display unit 10 and function as a support.

[0151] ​For example, the spacer 340 can be disposed between the pixel defining film 110 between the first and second display elements of the display unit 10 and the first partition wall B1 between the transmission layer 313 and the second color quantum dot layer 323 of the color filter unit 20. However, the spacer 340 is not limited thereto, and can be disposed between the pixel defining film 110 between the first and third display elements of the display unit 10 and the first partition wall B1 between the transmission layer 313 and the third color quantum dot layer 333 of the color filter unit 20. In addition, a plurality of spacers 340 can be included.

[0152] When the transmission layer 313 is formed, the spacer 340 can be simultaneously formed. In other words, the transmission layer 313 and the spacer 340 in an isolated shape can be simultaneously formed in an operation of patterning the transparent material layer TR. In this case, the layer structure of the spacer 340 can be the same as that of the transmission layer 313. In addition, the spacer 340 can include the same material as that of the transmission layer 313. When the transmission layer 313 includes the scattering particles SP, the spacer 340 can also include the scattering particles SP. Accordingly, the spacer 340 and the transmission layer 313 can not be separately formed, and thus operation efficiency can be improved.

[0153] The number of the protrusions PR of the transmission layer 313 and / or the spacer 340 can be adjusted according to an example embodiment. As the number of the protrusions PR and / or the spacer 340 increases, the function of the support is strengthened, but the flow of the material (e.g., a filler, etc.) in a liquid state desired in an operation is hindered, and thus the number of the protrusions PR and / or the spacer 340 in an appropriate level can be adjusted according to a device desired.

[0154] As an example, the protrusions PR of the transmission layer 313 and / or the spacer 340 can be selectively formed on all or a part of the pixels included in the display apparatus 1. For example, the protrusions PR of the transmission layer 313 and / or the spacer 340 can be periodically formed in a certain number (e.g., 4x4, 5x5, etc.) as a unit. That is, the protrusions PR of the transmission layer 313 can be selectively disposed according to a predetermined period or pattern with respect to a plurality of pixels.

[0155] As another example, the number, shape, height, position, etc. of the protrusions PR of the transmission layer 313 and / or the spacer 340 in the pixels in which the protrusions PR of the transmission layer 313 and / or the spacer 340 are positioned can be variously designed. For example, one or more protrusions PR of the transmission layer 313, one or more spacers 340, or one or more protrusions PR of the transmission layer 313 and one or more spacers 340 can be positioned in selected pixels according to a predetermined period or pattern.

[0156] A color filter unit manufacturing method of manufacturing a color filter unit and a display device manufacturing method of manufacturing a display device are also within the scope of the inventive concept.

[0157] According to the above-described embodiments, a color filter unit having improved defect rate and improved viewing angle and a display device including the same can be implemented. The scope of the inventive concept is not limited by these effects.

[0158] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as being applicable to other similar features or aspects in other embodiments. While one or more embodiments have been described with reference to the figures, it will be apparent to those of ordinary skill in the art that various changes in form and details can be made therein without departing from the spirit and scope as defined by the following claims.

[0159] Some of the advantages that can be achieved by the exemplary implementations / embodiments of the invention and / or the exemplary methods of the invention include providing a color filter unit having improved defect rate and improved viewing angle and a display device including the same.

[0160] While certain example embodiments and implementations have been described herein, other embodiments and modifications will be apparent to those of ordinary skill in the art. Therefore, the inventive concept is not limited to the described embodiments, but rather the scope of the inventive concept is to be accorded the broadest scope consistent with the principles and novel features disclosed herein, and consistent with the scope of the claims appended hereto.

Claims

1. A color filter unit, the color filter unit comprising: Upper base; The first color filter layer, the second color filter layer, and the third color filter layer are on the first surface, which serves as the lower surface of the upper substrate. A transmissive layer, on the first color filter layer, having one or more protrusions in a direction away from the first surface; The second color quantum dot layer is on the second color filter layer; A third color quantum dot layer is placed on the third color filter layer; as well as The first protective layer is located on the second and third color quantum dot layers and below the transmissive layer.

2. The color filter unit according to claim 1, wherein, The transmission layer includes scattering particles.

3. The color filter unit according to claim 1, wherein the color filter unit further comprises: A partition wall is located between the transmissive layer and the second color quantum dot layer; as well as Spacer, on the partition wall.

4. The color filter unit according to claim 3, wherein, The layer structure of the spacer is the same as that of the transmission layer.

5. The color filter unit according to claim 4, wherein, The spacer is made of the same material as the transmissive layer.

6. The color filter unit according to claim 4, wherein, Both the spacer and the transmission layer include scattering particles.

7. The color filter unit according to claim 1, wherein, The first protective layer is located between the first color filter layer and the transmission layer, and covers the upper surface of the second color quantum dot layer and the upper surface of the third color quantum dot layer.

8. The color filter unit according to claim 7, wherein, The first protective layer is integral and covers the entire first surface of the upper substrate.

9. The color filter unit according to claim 1, wherein, The second color quantum dot layer converts light with a wavelength of the first band into light with a wavelength of the second band, and the third color quantum dot layer converts light with a wavelength of the first band into light with a wavelength of the third band.

10. A display device, the display device comprising: The display unit includes a lower substrate and a first display element, a second display element and a third display element on the lower substrate; as well as A color filter unit includes an upper substrate having a first surface, the first surface being a lower surface facing the first display element, the second display element, and the third display element. The color filter unit includes: A first color filter layer, a second color filter layer, and a third color filter layer are respectively stacked on the first surface of the upper substrate with the first display element, the second display element, and the third display element. A transmissive layer, on the first color filter layer, having one or more protrusions in a direction away from the first surface; The second color quantum dot layer is on the second color filter layer; A third color quantum dot layer, on the third color filter layer; and The first protective layer is located on the second and third color quantum dot layers and below the transmissive layer.

11. The display device according to claim 10, wherein, The one or more protrusions contact the top layer of the display unit.

12. The display device according to claim 10, wherein, The transmission layer includes scattering particles.

13. The display device according to claim 10, wherein, The display unit further includes: A pixel-defining film is located between the first display element and the second display element. The color filter unit further includes: A partition wall exists between the transmissive layer and the second color quantum dot layer; and A spacer is located between the pixel defining film and the partition wall, and contacts the uppermost layer of the display unit.

14. The display device according to claim 13, wherein, The layer structure of the spacer is the same as that of the transmission layer.

15. The display device according to claim 14, wherein, The spacer is made of the same material as the transmissive layer.

16. The display device according to claim 14, wherein, Both the spacer and the transmission layer include scattering particles.

17. The display device according to claim 10, wherein, The second color quantum dot layer is located between the second color filter layer and the second display element, and the third color quantum dot layer is located between the third color filter layer and the third display element.

18. The display device according to claim 17, wherein, The first protective layer is located between the first color filter layer and the transmissive layer, and covers the surface of the second color quantum dot layer facing the second display element and the surface of the third color quantum dot layer facing the third display element.

19. The display device according to claim 18, wherein, The first protective layer is integral and covers the entire first surface of the upper substrate.

20. The display device according to claim 10, wherein, The first display element, the second display element, and the third display element include: A first pixel electrode corresponding to the first display element, a second pixel electrode corresponding to the second display element, and a third pixel electrode corresponding to the third display element; The electrodes correspond to the first pixel electrode, the second pixel electrode, and the third pixel electrode; and An intermediate layer is located between each of the first pixel electrode, the second pixel electrode, and the third pixel electrode and the counter electrode, and includes a first color emitting layer that emits light having a wavelength of a first band.

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