Display devices

Abstract

The present disclosure relates to a display device, comprising: a substrate including a display area, wherein the display area includes a first display device, a second display device, and a third display device; a first protective layer disposed on the first display device, the second display device, and the third display device; a first color conversion layer disposed on the first protective layer corresponding to the first display device and including first quantum dots that convert incident light into a first light; a second color conversion layer disposed on the first protective layer corresponding to the second display device and including second quantum dots that convert incident light into a second light; and a third color conversion layer disposed on the first protective layer corresponding to the third display device and including light scattering particles that convert incident light into a third light.

Description

Technical Field

[0001] Embodiments relate to display devices, and more particularly, to display devices having improved light efficiency. Background Art

[0002] The display device is used to visually display data, and thus, the display device has recently been used for various purposes in various fields.

[0003] As the uses of display devices have diversified, various research efforts have been underway to improve the quality of these devices. In particular, in response to the trend toward higher-resolution display devices, research has been actively conducted to improve the color reproducibility of these devices. Recently, display devices with improved light efficiency and color reproducibility have been developed using color conversion materials including quantum dots. Summary of the Invention

[0004] Embodiments include display devices with improved light extraction efficiency and clear color emission from each pixel. However, these issues are merely examples, and the scope of the present disclosure is not limited thereto.

[0005] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the embodiments.

[0006] According to an embodiment of the present invention, a display device may include a substrate, a first protective layer, a first color conversion layer, a second color conversion layer, and a third color conversion layer. The substrate may include a display area and a non-display area. The display area may include: a first pixel including a first display device; a second pixel including a second display device; and a third pixel including a third display device. The non-display area may be disposed adjacent to the display area. The first protective layer may be disposed on the first, second, and third display devices. The first color conversion layer may be disposed on the first protective layer corresponding to the first display device and may include first quantum dots that convert incident light into first light. The second color conversion layer may be disposed on the first protective layer corresponding to the second display device and may include second quantum dots that convert incident light into second light. The third color conversion layer may be disposed on the first protective layer corresponding to the third display device and may include light scattering particles that scatter the incident light and convert it into third light. The first, second, and third lights have different colors.

[0007] In an embodiment, the first color conversion layer, the second color conversion layer, and the third color conversion layer may be disposed directly on the first protective layer.

[0008] In an embodiment, the first protective layer may include an inorganic material.

[0009] In an embodiment, the display device may further include: a first color filter disposed on the first color conversion layer and selectively transmitting the first light; a second color filter disposed on the second color conversion layer and selectively transmitting the second light; and a third color filter disposed on the third color conversion layer and selectively transmitting the third light.

[0010] In an embodiment, the display device may further include: a blocking member disposed between the first color conversion layer and the second color conversion layer and between the second color conversion layer and the third color conversion layer.

[0011] In an embodiment, the barrier may include an organic material.

[0012] In an embodiment, the display device may further include: a light blocking member disposed on the blocking member, wherein the light blocking member and the third color filter may include the same material.

[0013] In an embodiment, the display device may further include: a second protection layer disposed on the first color filter, the second color filter, and the third color filter.

[0014] In an embodiment, the second protective layer may include an inorganic material.

[0015] In an embodiment, the display device may further include: a thin film encapsulation layer disposed on the second protective layer, and the thin film encapsulation layer may include at least one inorganic encapsulation layer and at least one organic encapsulation layer.

[0016] In an embodiment, the thin film encapsulation layer may be directly disposed on the second protective layer.

[0017] In an embodiment, the first display device, the second display device, and the third display device may each emit blue light.

[0018] In an embodiment, the display device may further include: a first dam portion provided on the non-display area adjacent to the periphery of the display area; and a second dam portion spaced apart from the first dam portion and provided adjacent to the periphery of the display area.

[0019] According to one or more embodiments, a method of manufacturing a display device may include: forming a first display device, a second display device, and a third display device on a substrate; forming a first protective layer on the first display device, the second display device, and the third display device; forming a blocking member on the first protective layer, the blocking member exposing a portion of the first protective layer corresponding to the first display device, the second display device, and the third display device; forming a first color conversion layer on the first protective layer corresponding to the first display device, the first color conversion layer including first quantum dots that convert incident light into first light; forming a second color conversion layer on the first protective layer corresponding to the second display device, the second color conversion layer including second quantum dots that convert incident light into second light; and forming a third color conversion layer on the first protective layer corresponding to the third display device, the third color conversion layer including light scattering particles that convert incident light into third light. The first light, the second light, and the third light may have different colors.

[0020] In an embodiment, the first color conversion layer, the second color conversion layer, and the third color conversion layer may be formed directly on the first protective layer.

[0021] In an embodiment, the method may further include: after forming the first color conversion layer, the second color conversion layer, and the third color conversion layer, forming a first color filter on the first color conversion layer, the first color filter selectively transmitting the first light; and forming a second color filter on the second color conversion layer, the second color filter selectively transmitting the second light.

[0022] In an embodiment, the method may further include: forming a third color filter on the third color conversion layer after forming the first color filter and the second color filter, the third color filter selectively transmitting the third light.

[0023] In an embodiment, the method may further include: forming a second protection layer on the first color filter, the second color filter, and the third color filter after forming the third color filter.

[0024] In an embodiment, the first protective layer and the second protective layer may each include an inorganic material.

[0025] In an embodiment, the first display device, the second display device, and the third display device may each emit blue light.

[0026]

[0011] Further aspects, features and advantages in addition to those described above will become apparent from the following detailed description, the appended claims and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other aspects, features and advantages of the embodiments will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a perspective view showing a display device according to an embodiment;

[0029] Figure 2 is a plan view schematically showing a display device according to an embodiment;

[0030] Figure 3 is a schematic diagram of an equivalent circuit of a pixel that may be included in a display device according to an embodiment;

[0031] Figure 4 is a diagram showing a display device according to an embodiment Figure 2 A schematic cross-sectional view taken along line II' in FIG.

[0032] Figure 5 is a diagram showing a display device according to an embodiment Figure 2 A schematic cross-sectional view taken along line II' in FIG.

[0033] Figure 6A and Figure 6B is a diagram showing a display device according to an embodiment Figure 2 A schematic cross-sectional view taken along line II-II' in FIG.

[0034] Figures 7A to 7G is a schematic cross-sectional view showing a part of a process of manufacturing a display device. DETAILED DESCRIPTION

[0035] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the embodiments may have different forms and should not be construed as limited to the description set forth herein. Accordingly, the embodiments are described below with reference to the accompanying drawings to explain various aspects of the specification.

[0036] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Throughout this disclosure, the expression "at least one of a, b, and c" may mean only a, only b, only c, both a and b, both a and c, both b and c, all a, b, and c, or variations thereof.

[0037] For purposes of its meaning and interpretation, the phrase "at least one of" is intended to include the meaning of "at least one selected from the group of." For example, "at least one of A and B" can be understood to mean "A, B, or A and B." When the term "at least one of" follows a list of elements, it modifies the entire list of elements and does not modify the individual elements of the list.

[0038] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, and in the following description, the same reference numerals will refer to the same elements, and repeated descriptions thereof will be omitted.

[0039] It will be understood that although terms such as "first" and "second" may be used herein to describe various components, these components should not be limited by these terms, and these terms are only used to distinguish one component from another. In addition, as used herein, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms as well.

[0040] It will be understood that the terms “comprises,” “includes,” and “having” as used herein specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.

[0041] It will be understood that when a layer, region, or component is referred to as being “positioned on,” “disposed on,” or “formed on” another layer, region, or component, the layer, region, or component may be positioned “directly” or “indirectly” on the other layer, region, or component. For example, one or more intermediate layers, regions, or components may be positioned therebetween.

[0042] For the convenience of description, the sizes of the components in the drawings may be exaggerated. In other words, since the sizes and thicknesses of the components in the drawings are arbitrarily shown for the convenience of description, the present disclosure is not limited thereto.

[0043] The x-axis, y-axis, and z-axis are not limited to the three axes of the rectangular coordinate system and can be interpreted in a broader sense. For example, the x-axis, y-axis, and z-axis can be perpendicular to each other, or can represent different directions that are not perpendicular to each other.

[0044] When a certain 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 a reverse order from the described order.

[0045] Figure 1 is a perspective view showing a display device according to an embodiment.

[0046] Reference Figure 1, the display device 1 may include a display area DA and a non-display area NDA adjacent to the display area DA. The non-display area NDA may be arranged (or set) around the display area DA. The non-display area NDA may surround the display area DA. The display device 1 may provide an image by using light emitted from pixels P arranged (or set) in the display area DA, and the non-display area NDA may be an area in which no image is displayed. The pixel P may be a first pixel P1 (see Figure 2 ), the second pixel P2 (see Figure 2 ) and the third pixel P3 (see Figure 2 )one of the.

[0047] Hereinafter, although an organic light-emitting display device is described as an example of the display device 1 according to an embodiment, the display device of the present disclosure is not limited thereto. In an embodiment, the display device 1 of the present disclosure may be an inorganic light-emitting display device (or an inorganic electroluminescent (EL) display device), or may be a display device such as a quantum dot light-emitting display device. For example, the emission layer of the display element included in the display device 1 may include an organic material, may include an inorganic material, may include quantum dots, may include an organic material and quantum dots, or may include an inorganic material and quantum dots.

[0048] although Figure 1 The display device 1 is shown to have a flat display surface, but the present disclosure is not limited thereto. In an embodiment, the display device 1 may include a three-dimensional display surface or a curved display surface.

[0049] When the display device 1 includes a three-dimensional display surface, the display device 1 may include display areas indicating different directions, and may include, for example, a polygonal columnar display surface. In an embodiment, when the display device 1 includes a curved display surface, the display device 1 may be implemented in various forms such as a flexible display device, a foldable display device, and a rollable display device.

[0050] Figure 1 A display device 1 that can be applied to a mobile phone terminal is shown. Although not shown, the mobile phone terminal can be constructed by arranging the electronic module, camera module, power module, etc. mounted on a main board together with the display device 1 in a bracket / housing, etc. The display device 1 according to the present disclosure can be applied to large electronic devices such as televisions or monitors, as well as small and medium-sized electronic devices such as tablet computers, car navigation devices, game consoles, or smart watches.

[0051] although Figure 1 An embodiment is shown in which the display area DA of the display device 1 is a quadrangle, but the shape of the display area DA may be a circle, an ellipse, or a polygon such as a triangle or a pentagon.

[0052] Figure 2 is a plan view schematically showing a part of a display device according to an embodiment.

[0053] Reference Figure 2 , the display device 1 may include pixels P arranged (or set) in a display area DA. The pixel P arranged (or set) in the display area DA may be, for example, one of a first pixel P1, a second pixel P2, and a third pixel P3. The first pixel P1, the second pixel P2, and the third pixel P3 may each include a display device such as an organic light emitting diode OLED. The first pixel P1, the second pixel P2, and the third pixel P3 may emit, for example, red light, green light, blue light, or white light from the organic light emitting diode OLED. Here, the first pixel P1, the second pixel P2, and the third pixel P3 may be understood as pixels that emit any one of red light, green light, blue light, and white light as described above.

[0054] The first pixel P1 may be electrically connected to a peripheral circuit disposed (or provided) in the non-display area NDA. A first scan driving circuit 110, a first emission driving circuit 115, a second scan driving circuit 120, a terminal 140, a data driving circuit 150, a first power line 160, and a second power line 170 may be disposed (or provided) in the non-display area NDA. Although not shown, the second pixel P2 and the third pixel P3 may also be electrically connected to the peripheral circuit disposed (or provided) in the non-display area NDA.

[0055] The first scan driving circuit 110 may provide a scan signal to the first pixel P1 through the scan line SL. The first emission driving circuit 115 may provide an emission control signal to the first pixel P1 through the emission control line EL. Although not shown, the first scan driving circuit 110 may provide a scan signal to the second pixel P2 and the third pixel P3 through the scan line SL, and the first emission driving circuit 115 may provide an emission control signal to the second pixel P2 and the third pixel P3 through the emission control line EL.

[0056] The second scan driving circuit 120 may be arranged (or disposed) in parallel with the first scan driving circuit 110, with the display area DA interposed between the second scan driving circuit 120 and the first scan driving circuit 110. Some first pixels P1 arranged (or disposed) in the display area DA may be electrically connected to the first scan driving circuit 110, and other first pixels P1 may be electrically connected to the second scan driving circuit 120. In an embodiment, a second emission driving circuit (not shown) may be arranged (or disposed) in parallel with the first emission driving circuit 115, with the display area DA interposed between the second emission driving circuit (not shown) and the first emission driving circuit 115.

[0057] The first emission driving circuit 115 may be arranged (or disposed) above the non-display area NDA while being spaced apart from the first scan driving circuit 110 in the x-direction. In an embodiment, the first emission driving circuit 115 may be arranged (or disposed) alternately with the first scan driving circuit 110 in the y-direction.

[0058] The terminal 140 may be arranged (or provided) at one side of the substrate 100. The terminal 140 may be exposed by not being covered by the insulating layer and may be electrically connected to the printed circuit board PCB. The terminal PCB-P of the printed circuit board PCB may be electrically connected to the terminal 140 of the display device 1. The printed circuit board PCB may be configured to transmit power or signals of a controller (not shown) to the display device 1. The control signal generated by the controller may be transmitted to each of the first scan drive circuit 110 and the second scan drive circuit 120 and the first emission drive circuit 115 through the printed circuit board PCB. The controller may provide the first power supply voltage and the second power supply voltage to the first power line 160 and the second power line 170 through the first connection line 161 and the second connection line 171, respectively. The first power supply voltage ELVDD (see Figure 3 ) is supplied to the first pixel P1, and the second power supply voltage ELVSS (see Figure 3 ) is supplied to an opposite electrode of the first pixel P1 electrically connected to the second power line 170. Although not shown, the first power supply voltage ELVDD may be supplied to the second pixel P2 and the third pixel P3 through the driving voltage line PL electrically connected to the first power line 160, and the second power supply voltage ELVSS may be supplied to the opposite electrode of the second pixel P2 and the third pixel P3 electrically connected to the second power line 170.

[0059] The data driving circuit 150 may be electrically connected to the data line DL. A data signal from the data driving circuit 150 may be supplied to the first pixel P1 via a connection line 151 electrically connected to the terminal 140 and a data line DL electrically connected to the connection line 151. Although not shown, the data driving circuit 150 may supply a data signal to the second pixel P2 and the third pixel P3 via the data line DL.

[0060] Figure 2 The data driving circuit 150 is shown to be arranged on the printed circuit board PCB. In an embodiment, the data driving circuit 150 can be arranged (or provided) on the substrate 100. For example, the data driving circuit 150 can be arranged (or provided) between the terminal 140 and the first power line 160.

[0061] The first power line 160 may include a first sub-line 162 and a second sub-line 163 extending in parallel in the x-direction with the display area DA interposed therebetween. The second power line 170 may partially surround the display area DA in a ring shape with one side open.

[0062] Figure 3 is a schematic diagram of an equivalent circuit of a pixel that may be included in the display device according to the embodiment.

[0063] Reference Figure 3 , each pixel P (ie, the first pixel P1 , the second pixel P2 , or the third pixel P3 ) may include a pixel circuit PC electrically connected to a scan line SL and a data line DL and an organic light emitting diode OLED electrically connected to the pixel circuit PC.

[0064] The pixel circuit PC may include a driving thin film transistor T1, a switching thin film transistor T2, and a storage capacitor Cst. The switching thin film transistor T2 may be electrically connected to a scan line SL and a data line DL, and may be configured to transmit a data signal Dm input through the data line DL to the driving thin film transistor T1 according to a scan signal Sn input through the scan line SL.

[0065] The storage capacitor Cst may be electrically connected to the switching thin film transistor T2 and the driving voltage line PL and may store a voltage corresponding to a difference between a voltage received from the switching thin film transistor T2 and a first power voltage ELVDD (or driving voltage) supplied to the driving voltage line PL.

[0066] The driving thin film transistor T1 can be electrically connected to the driving voltage line PL and the storage capacitor Cst, and can control the driving current flowing from the driving voltage line PL through the organic light emitting diode OLED in response to the voltage value stored in the storage capacitor Cst. The organic light emitting diode OLED can emit light with a specific brightness according to the driving current.

[0067] although Figure 3 The pixel circuit PC is shown to include two thin film transistors and one storage capacitor, but the present disclosure is not limited thereto. In various embodiments, the pixel circuit PC may include seven thin film transistors and one storage capacitor, or may include five thin film transistors and two storage capacitors.

[0068] Figure 4 is a diagram showing a display device according to an embodiment Figure 2 Schematic cross-sectional view taken along line II' in FIG.

[0069] Reference Figure 4According to an embodiment, a display device 1 may include: a substrate 100, the substrate 100 including a display area DA, the display area DA including a first pixel P1, a second pixel P2, and a third pixel P3, the first pixel P1 including a first display device OLED1, the second pixel P2 including a second display device OLED2, and the third pixel P3 including a third display device OLED3; a first protective layer 240 provided on the first display device OLED1, the second display device OLED2, and the third display device OLED3; a first color conversion layer 310a arranged (or provided) on the first protective layer 240 corresponding to the first display device OLED1 and including first quantum dots that convert incident light into first light Lr; a second color conversion layer 310b arranged (or provided) on the first protective layer 240 corresponding to the second display device OLED2 and including second quantum dots that convert incident light into second light Lg; and a third color conversion layer 310c arranged (or provided) on the first protective layer 240 corresponding to the third display device OLED3 and including light scattering particles that convert the incident light into third light Lb by scattering the incident light. The first display device OLED1, the second display device OLED2, and the third display device OLED3 may each include an organic light emitting diode OLED. The first light Lr, the second light Lg, and the third light Lb may have different colors. In an embodiment, the first display device OLED1, the second display device OLED2, and the third display device OLED3 may be display devices that emit blue light.

[0070] The substrate 100 may include a glass material or a polymer resin containing SiO2 as a main component. The polymer resin may include at least one of polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, and cellulose acetate propionate. The substrate 100 including the polymer resin may be flexible, rollable, or bendable. The substrate 100 may have a multilayer structure including an inorganic layer (not shown) and a layer including the above-mentioned polymer resin.

[0071] The buffer layer 101 may be positioned on the substrate 100 to reduce or block the infiltration of foreign matter, moisture, or external air from the bottom of the substrate 100, and may provide a flat surface on the substrate 100. The buffer layer 101 may include an inorganic material such as an oxide or nitride, an organic material, or an organic / inorganic composite material, and may include a single layer or multilayer structure of an inorganic material and an organic material. A barrier layer (not shown) for blocking the infiltration of external air may be further included between the substrate 100 and the buffer layer 101.

[0072] A first insulating layer 102 may be disposed (or provided) on the buffer layer 101. The first insulating layer 102 may include silicon oxide (SiO2), silicon nitride (SiN X ), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiO2), tantalum oxide (Ta2O5), hafnium oxide (HfO2), and zinc oxide (ZnO2). The first insulating layer 102 may include a single layer or multiple layers including the above inorganic insulating materials.

[0073] A thin film transistor (TFT) may be disposed over the first insulating layer 102. The thin film transistor (TFT) may include a semiconductor layer 134, a gate electrode 136, a source electrode 137, and a drain electrode 138. The thin film transistor (TFT) may be electrically connected to the first display device OLED1, the second display device OLED2, and the third display device OLED3 to drive the first display device OLED1, the second display device OLED2, and the third display device OLED3.

[0074] The semiconductor layer 134 may include a channel region 131 arranged (or disposed) on the first insulating layer 102, and may overlap with the gate electrode 136 and the source region 132 and the drain region 133 arranged (or disposed) on both sides of the channel region 131, and may include impurities with a higher concentration than that of the channel region 131. Here, the impurities may include N-type impurities or P-type impurities. The source region 132 and the drain region 133 may be electrically connected to the source electrode 137 and the drain electrode 138 of the thin film transistor TFT, respectively.

[0075] The semiconductor layer 134 may include an oxide semiconductor and / or a silicon semiconductor. When the semiconductor layer 134 includes an oxide semiconductor, the semiconductor layer 134 may include, for example, an oxide of at least one of indium (In), gallium (Ga), tin (Sn), zirconium (Zr), vanadium (V), hafnium (Hf), cadmium (Cd), germanium (Ge), chromium (Cr), titanium (Ti), and zinc (Zn). For example, the semiconductor layer 134 may include InSnZnO (ITZO) or InGaZnO (IGZO). When the semiconductor layer 134 includes a silicon semiconductor, the semiconductor layer 134 may include, for example, amorphous silicon (a-Si) or low-temperature polysilicon (LTPS) crystallized from amorphous silicon (a-Si).

[0076] The gate electrode 136 may include a single layer or multiple layers formed of at least one of aluminum (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). The gate electrode 136 may be electrically connected to a gate line for applying an electrical signal to the gate electrode 136.

[0077] A second insulating layer 103 may be disposed between the semiconductor layer 134 and the gate electrode 136. The second insulating layer 103 may include silicon oxide (SiO2), silicon nitride (SiN X ), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiO2), tantalum oxide (Ta2O5), hafnium oxide (HfO2), and zinc oxide (ZnO2). The second insulating layer 103 may include a single layer or multiple layers including the above inorganic insulating materials.

[0078] A third insulating layer 105 may be provided to cover the gate electrode 136. The third insulating layer 105 may include silicon oxide (SiO2), silicon nitride (SiN X ), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiO2), tantalum oxide (Ta2O5), hafnium oxide (HfO2), and zinc oxide (ZnO2). The third insulating layer 105 may include a single layer or multiple layers including the above inorganic insulating materials.

[0079] The source electrode 137 and the drain electrode 138 may be disposed on the third insulating layer 105. The source electrode 137 and the drain electrode 138 may include a conductive material including molybdenum (Mo), aluminum (Al), copper (Cu), or titanium (Ti), and may include a single layer or multiple layers including the above conductive materials. For example, the source electrode 137 and the drain electrode 138 may include a multilayer structure of Ti / Al / Ti.

[0080] A fourth insulating layer 107 may be disposed on the source electrode 137 and the drain electrode 138. The fourth insulating layer 107 may prevent wires containing metals such as aluminum, which may be damaged by etchants, from being exposed to etching environments during the display device manufacturing process. The fourth insulating layer 107 may be disposed to extend to the non-display area (NDA). In some embodiments, the fourth insulating layer 107 may be omitted.

[0081] A planarization layer 113 may be disposed on the fourth insulating layer 107. The planarization layer 113 may have a flat upper surface so that a pixel electrode disposed thereon may be formed to be flat.

[0082] The planarization layer 113 may include a single layer or multiple layers formed of an organic material or an inorganic material. The planarization layer 113 may include a general polymer such as benzocyclobutene (BCB), polyimide, hexamethyldisiloxane (HMDSO), polymethyl 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 paraxylene polymer, a vinyl alcohol polymer or any blend thereof. The planarization layer 113 may include silicon oxide (SiO2), silicon nitride (SiN X ), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiO2), tantalum oxide (Ta2O5), hafnium oxide (HfO2), or zinc oxide (ZnO2). After forming the planarization layer 113, chemical mechanical polishing may be performed to provide a flat upper surface.

[0083] The planarization layer 113 may include an opening exposing one of the source electrode 137 and the drain electrode 138 of the thin film transistor TFT, and the pixel electrode may contact the source electrode 137 or the drain electrode 138 through the opening to be electrically connected to the thin film transistor TFT.

[0084] A bias electrode BSM may be arranged between the buffer layer 101 and the semiconductor layer 134 to correspond to the thin film transistor TFT. A voltage may be applied to the bias electrode BSM. For example, the bias electrode BSM may be electrically connected to the source electrode 137 or the drain electrode 138 of the thin film transistor TFT. Since the bias electrode BSM may be supplied with a voltage in conjunction with the potential of the source electrode 137 or the drain electrode 138 of the thin film transistor TFT, the thin film transistor TFT may be stabilized. In an embodiment, the bias electrode BSM may be electrically connected to a separate bias line rather than being electrically connected to the source electrode 137 or the drain electrode 138 of the thin film transistor TFT.

[0085] A first display device OLED1 including a first pixel electrode 210a, a first intermediate layer 220a, and a first opposing electrode 230a may be positioned on the planarization layer 113 of the substrate 100. The first opposing electrode 230a is arranged to face the first pixel electrode 210a. The first intermediate layer 220a is interposed between the first opposing electrode 230a and the first pixel electrode 210a. A second display device OLED including a second pixel electrode 210b, a second intermediate layer 220b, and a second opposing electrode 230b may be positioned on the planarization layer 113 of the substrate 100. 2, the second opposing electrode 230b is arranged to face the second pixel electrode 210b, the second intermediate layer 220b is interposed between the second opposing electrode 230b and the second pixel electrode 210b, and a third display device OLED3 including a third pixel electrode 210c, a third intermediate layer 220c and a third opposing electrode 230c can be positioned on the planarization layer 113 of the substrate 100, the third opposing electrode 230c is arranged to face the third pixel electrode 210c, and the third intermediate layer 220c is interposed between the third opposing electrode 230c and the third pixel electrode 210c.

[0086] The first pixel electrode 210a, the second pixel electrode 210b and the third pixel electrode 210c can be arranged on the planarization layer 113. The first pixel electrode 210a, the second pixel electrode 210b and the third pixel electrode 210c can be (semi) transparent electrodes or reflective electrodes. The first pixel electrode 210a, the second pixel electrode 210b and the third pixel electrode 210c may include a reflective layer formed of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr or any compound thereof and a transparent or semi-transparent electrode layer formed on the reflective layer. The transparent or semi-transparent electrode layer may include at least one of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO) and aluminum zinc oxide (AZO). The first pixel electrode 210a, the second pixel electrode 210b and the third pixel electrode 210c can be provided in a stacked structure of ITO / Ag / ITO.

[0087] A pixel defining layer 180 may be disposed on the planarization layer 113 and may include an opening exposing at least a portion of the first pixel electrode 210a, an opening exposing at least a portion of the second pixel electrode 210b, and an opening exposing at least a portion of the third pixel electrode 210c. The pixel defining layer 180 may increase the distance between the edge of the first pixel electrode 210a and the first opposing electrode 230a located above the first pixel electrode 210a to prevent arcing, etc. at the edge of the first pixel electrode 210a, increase the distance between the edge of the second pixel electrode 210b and the second opposing electrode 230b located above the second pixel electrode 210b to prevent arcing, etc. at the edge of the second pixel electrode 210b, and increase the distance between the edge of the third pixel electrode 210c and the third opposing electrode 230c located above the third pixel electrode 210c to prevent arcing, etc. at the edge of the third pixel electrode 210c. For example, the pixel defining layer 180 may be formed of an organic insulating material such as polyimide, polyamide, acrylic resin, benzocyclobutene, hexamethyldisilazane (HMDSO), or phenolic resin by spin coating or the like.

[0088] The first intermediate layer 220a may be disposed on the first pixel electrode 210a at least partially exposed by the pixel defining layer 180, the second intermediate layer 220b may be disposed on the second pixel electrode 210b, and the third intermediate layer 220c may be disposed on the third pixel electrode 210c. The first intermediate layer 220a, the second intermediate layer 220b, and the third intermediate layer 220c may include an emission layer, and functional layers such as a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL), and an electron injection layer (EIL) may optionally be further included below and above the emission layer.

[0089] The emission layer may include an organic material including a fluorescent or phosphorescent material that emits red, green, blue, or white light. The emission layer may include a low molecular weight organic material or a high molecular weight organic material. For example, the emission layer included in the first intermediate layer 220a, the second intermediate layer 220b, and the third intermediate layer 220c may include a material that emits blue light.

[0090] When the emission layer includes a low molecular weight material, the first intermediate layer 220a, the second intermediate layer 220b, and the third intermediate layer 220c may include a structure in which a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) are stacked in a single structure or a composite structure, and the low molecular weight organic material may include various organic materials such as copper phthalocyanine (CuPc), N,N'-di(naphthalene-1-yl)-N,N'-diphenylbenzidine (N,N'-di(naphthalene-1-yl)-N,N'-diphenylbenzidine) (NPB), and tris-8-hydroxyquinoline aluminum (Alq3). These layers can be formed by vacuum deposition.

[0091] When the emission layer includes a high molecular weight material, the first intermediate layer 220a, the second intermediate layer 220b, and the third intermediate layer 220c may generally have a structure including a hole transport layer (HTL) and an emission layer (EML). The hole transport layer may include poly (3,4-ethylenedioxythiophene) (PEDOT), and the emission layer may include a high molecular weight material such as poly (p-phenylene vinylene) (PPV) and polyfluorene. The emission layer may be formed by screen printing, inkjet printing, or laser induced thermal imaging (LITI).

[0092] Although the first, second, and third intermediate layers 220a, 220b, and 220c are shown as being provided in the pixels P1, P2, and P3, respectively, the present disclosure is not limited thereto. The first, second, and third intermediate layers 220a, 220b, and 220c may be integrally formed in the pixels P1, P2, and P3.

[0093] In an embodiment, the first display device OLED1, the second display device OLED2, and the third display device OLED3 provided in the first pixel P1, the second pixel P2, and the third pixel P3, respectively, may each include an emission layer that emits light of the same color. For example, the first display device OLED1, the second display device OLED2, and the third display device OLED3 provided in the first pixel P1, the second pixel P2, and the third pixel P3, respectively, may each emit blue light.

[0094] The first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may be arranged on the first intermediate layer 220a, the second intermediate layer 220b, and the third intermediate layer 220c, respectively. The first opposing electrode 230a may be arranged on the first intermediate layer 220a to completely cover the first intermediate layer 220a, the second opposing electrode 230b may be arranged on the second intermediate layer 220b to completely cover the second intermediate layer 220b, and the third opposing electrode 230c may be arranged on the third intermediate layer 220c to completely cover the third intermediate layer 220c. In an embodiment, the first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may be formed integrally.

[0095] The first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may include a conductive material having a low work function. For example, the first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may include a (semi-) transparent layer comprising silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), or any alloy thereof. The first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may further include a layer such as ITO, IZO, ZnO, or In2O3 located on the (semi-) transparent layer comprising the above materials.

[0096] A spacer (not shown) may be further included on the pixel defining layer 180 to prevent mask marking. The spacer may be formed integrally with the pixel defining layer 180. For example, the spacer and the pixel defining layer 180 may be formed simultaneously in the same process using a half-tone mask process.

[0097] In the case of a display device of the related art, the display device is manufactured through a process of bonding a first substrate in which a display device is arranged and a second substrate in which a color conversion layer is arranged; however, there may be problems such as malfunction due to misalignment in the process of bonding the first substrate to the second substrate, or reduction in light efficiency due to a filler arranged between the first substrate and the second substrate.

[0098] Therefore, the display device 1 according to the embodiment can have a structure in which the display device and the color conversion layer are sequentially arranged on one substrate without using a bonding process. Therefore, since the display device and the color conversion layer are arranged adjacent to each other, light efficiency and color reproducibility can be improved.

[0099] The first protective layer 240 may be disposed on the first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c. The first protective layer 240 may be disposed to cover the first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c. The first protective layer 240 may include silicon oxide (SiO2), silicon nitride (SiN X ), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiO2), tantalum oxide (Ta2O5), hafnium oxide (HfO2), and zinc oxide (ZnO2). The first protective layer 240 may include a single layer or multiple layers containing the above inorganic materials.

[0100] The barrier 250 may be disposed on the first protective layer 240 and may have an opening that exposes at least a portion of the first protective layer 240. More specifically, the barrier 250 may be disposed on the first protective layer 240 to expose at least a portion of the first protective layer 240 corresponding to the first display device OLED1, the second display device OLED2, and the third display device OLED3. For example, the barrier 250 may include an organic material such as polyimide, polyamide, acrylic resin, benzocyclobutene, hexamethyldisilazane (HMDSO), or phenolic resin.

[0101] On the first protective layer 240 at least partially exposed by the blocking member 250, a first color conversion layer 310a including first quantum dots that convert incident light into first light Lr corresponding to the first display device OLED1 of the first pixel P1 may be arranged (or set), a second color conversion layer 310b including second quantum dots that convert incident light into second light Lg corresponding to the second display device OLED2 of the second pixel P2 may be arranged (or set), and a third color conversion layer 310c including light scattering particles that convert incident light into third light Lb corresponding to the third display device OLED3 of the third pixel P3 may be arranged (or set).

[0102] In an embodiment, first color conversion layer 310a, second color conversion layer 310b, and third color conversion layer 310c may be disposed directly on first protective layer 240. Since first color conversion layer 310a, second color conversion layer 310b, and third color conversion layer 310c are disposed directly on first protective layer 240, a distance between first display device OLED1 and first color conversion layer 310a, a distance between second display device OLED2 and second color conversion layer 310b, and a distance between third display device OLED3 and third color conversion layer 310c may be reduced, and thus, light efficiency of the display device may be improved.

[0103] The first quantum dots may be excited by the blue incident light to isotropically emit first light Lr having a longer wavelength than the blue light. The second quantum dots may be excited by the blue incident light to isotropically emit second light Lg having a longer wavelength than the blue light.

[0104] First color conversion layer 310a, second color conversion layer 310b, and third color conversion layer 310c may include a photosensitive polymer having light-scattering particles dispersed therein. The photosensitive polymer may include an organic material having light transmittance. The light-scattering particles can excite more quantum dots by scattering a portion of incident light not absorbed by the quantum dots, thereby increasing the color conversion efficiency of first color conversion layer 310a and second color conversion layer 310b. For example, the light-scattering particles may include titanium oxide (TiO2) or metal particles.

[0105] The core of the quantum dot can be selected from Group II-VI compounds, Group III-V compounds, Group IV-VI compounds, Group IV elements, Group IV compounds, and any combination thereof.

[0106] The II-VI compounds may be selected from the following: binary compounds selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and any mixtures thereof; binary compounds selected from the group consisting of AgInS, CuInS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZn and any mixtures thereof; Ternary compounds selected from Te, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and any mixture thereof; and quaternary compounds selected from HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and any mixture thereof.

[0107] The III-V compounds may be selected from the following: binary compounds selected from GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and any mixture thereof; ternary compounds selected from GaNPs, GaNAs, GaNSb, GaPAs, GaPSb, AlNPs, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNPs, InNAs, InNSb, InPAs, InPSb and any mixture thereof; and quaternary compounds selected from GaAlNPs, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNPs, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNPs, InAlNAs, InAlNSb, InAlPAs, InAlPSb and any mixture thereof.

[0108] The IV-VI compound may be selected from the following: a binary compound selected from SnS, SnSe, SnTe, PbS, PbSe, PbTe, and any mixture thereof; a ternary compound selected from SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and any mixture thereof; and a quaternary compound selected from SnPbSSe, SnPbSeTe, SnPbSTe, and any mixture thereof. The IV group element may be selected from Si, Ge, and any mixture thereof. The IV group compound may include a binary compound selected from SiC, SiGe, and any mixture thereof.

[0109] The binary, ternary, or quaternary compound may be present in a particle at a uniform concentration, or may be present in the same particle with a concentration distribution that is partially divided into different states. Furthermore, quantum dots may have a core / shell structure in which one quantum dot surrounds another quantum dot. The interface between the core and the shell may have a concentration gradient in which the concentration of the element in the shell decreases toward the center.

[0110] In some embodiments, as described above, quantum dots may have a core-shell structure comprising: a core comprising nanocrystals; and a shell surrounding the core. The shell of the quantum dot may serve as a protective layer for preventing chemical modification of the core to maintain semiconductor properties and / or as a charging layer for imparting electrophoretic properties to the quantum dot. The shell may comprise a single layer or multiple layers. The interface between the core and the shell may have a concentration gradient in which the concentration of the element in the shell decreases toward its center. Examples of the shell of the quantum dot may include metal or non-metal oxides, semiconductor compounds, or any combination thereof.

[0111] For example, the metal or non-metal oxide may include a binary compound such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4 or NiO, or a ternary compound such as MgAl2O4, CoFe2O4, NiFe2O4 or CoMn2O4; however, the present disclosure is not limited thereto.

[0112] In addition, the semiconductor compound may include, for example, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, or AlSb, etc. However, the present disclosure is not limited thereto.

[0113] The quantum dot can have a full width at half maximum (FWHM) of an emission wavelength spectrum of about 45 nm or less, for example, a full width at half maximum (FWHM) of an emission wavelength spectrum of about 40 nm or less or about 30 nm or less, and within this range, its color purity or color reproducibility can be improved. In addition, since the light emitted by the quantum dot is emitted in all directions, its optical viewing angle can be improved.

[0114] In addition, the shape of the quantum dots may be any shape commonly used in the art, and may include, but is not limited to, spherical, pyramidal, multi-armed or cubic nanoparticles, nanotubes, nanowires, nanofibers or nanoplate particles, and the like.

[0115] Quantum dots can control the color of emitted light according to particle size, and thus, quantum dots can have various emission colors such as blue, red, and green.

[0116] The second quantum dot may be selected from a group consisting of a II-VI compound, a III-V compound, a IV-VI compound, a group IV element, a group IV compound, and any combination thereof. The second quantum dot may include the same material as the first quantum dot, wherein the size of the second quantum dot and the size of the first quantum dot may be equal to each other, however, the present disclosure is not limited thereto. In an embodiment, the size of the second quantum dot may be smaller than the size of the first quantum dot.

[0117] A first color filter 320a may be disposed on the first color conversion layer 310a, a second color filter 320b may be disposed on the second color conversion layer 310b, and a third color filter 320c may be disposed on the third color conversion layer 310c. The first color filter 320a may selectively transmit the first light Lr, the second color filter 320b may selectively transmit the second light Lg, and the third color filter 320c may selectively transmit the third light Lb. For example, the first color filter 320a may be disposed corresponding to the first pixel P1 to selectively transmit red light, the second color filter 320b may be disposed corresponding to the second pixel P2 to selectively transmit green light, and the third color filter 320c may be disposed corresponding to the third pixel P3 to selectively transmit blue light.

[0118] A light shielding member 330 may be disposed on the blocking member 250. The light shielding member 330 may be disposed between the first pixel P1 and the second pixel P2, and between the second pixel P2 and the third pixel P3. In an embodiment, at least a portion of the light shielding member 330 may be disposed on the first color filter 320a and the second color filter 320b. The light shielding member 330 may serve as an auxiliary light shield so that light is not emitted from the non-emitting area. The light shielding member 330 may include the same material as the third color filter 320c. In an embodiment, the light shielding member 330 and the third color filter 320c may include the same material. In an embodiment, the light shielding member 330 may include a black matrix, a black pigment, a metallic material, or the like.

[0119] A second protective layer 340 may be disposed on the first color filter 320a, the second color filter 320b, and the third color filter 320c. The second protective layer 340 may be disposed to cover the first color filter 320a, the second color filter 320b, and the third color filter 320c. The second protective layer 340 may include silicon oxide (SiO2), silicon nitride (SiN X ), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiO2), tantalum oxide (Ta2O5), hafnium oxide (HfO2), and zinc oxide (ZnO2). The second protective layer 340 may include a single layer or multiple layers containing the above inorganic materials.

[0120] In an embodiment, when the display device 1 does not include the thin film encapsulation layer 400, which will be described below, the first protective layer 240, the barrier 250, and the second protective layer 340 disposed on the display devices OLED1, OLED2, and OLED3 may serve as the thin film encapsulation layer 400. For example, since the first protective layer 240, the barrier 250, and the second protective layer 340 are sequentially disposed on the first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c, the first display device OLED1, the second display device OLED2, and the third display device OLED3 may be protected from external moisture and oxygen.

[0121] Figure 5 is a diagram showing a display device according to an embodiment Figure 2 More specifically, Figure 5 is a diagram illustrating an embodiment in which a thin film encapsulation layer 400 is disposed on the second protective layer 340 .

[0122] Reference Figure 5 , the thin film encapsulation layer 400 may be arranged (or provided) on the second protective layer 340. In an embodiment, the thin film encapsulation layer 400 may be directly arranged (or directly provided) on the second protective layer 340. The thin film encapsulation layer 400 may cover the display area DA (or overlap with the display area DA) and extend to the outside of the display area DA. The thin film encapsulation layer 400 may include at least one organic encapsulation layer and at least one inorganic encapsulation layer. For example, the thin film encapsulation layer 400 may include a first inorganic encapsulation layer 410, an organic encapsulation layer 420, and a second inorganic encapsulation layer 430. Since the thin film encapsulation layer 400 is arranged (or provided) on the second protective layer 340, the display device 1 may be protected from external moisture and oxygen.

[0123] The first inorganic encapsulation layer 410 and the second inorganic encapsulation layer 430 may include one or more inorganic insulating materials, and the one or more inorganic insulating materials may include at least one of aluminum oxide, titanium oxide, tantalum oxide, hafnium oxide, zinc oxide, silicon oxide, silicon nitride, and silicon oxynitride. The organic encapsulation layer 420 may include a polymer material. The polymer material may include acrylic resin, epoxy resin, polyimide, or polyethylene, etc. In an embodiment, when the thin film encapsulation layer 400 is directly arranged on the color filter, the second protective layer 340 may serve as the first inorganic encapsulation layer 410 of the thin film encapsulation layer 400.

[0124] Figure 6A and Figure 6B is a diagram showing a display device according to an embodiment Figure 2 Schematic cross-sectional view taken along line II-II'.

[0125] Reference Figure 6A , a first conductive layer 510 and a second conductive layer 520 may be disposed on the non-display area NDA of the display device 1 according to an embodiment. The first conductive layer 510 and the second conductive layer 520 may provide at least one of a data signal, a scan signal, an emission control signal, and a power supply voltage to the first pixel P1 disposed on the display area DA. In an embodiment, the first conductive layer 510 may include the same material as the gate electrode 136 described above, and the second conductive layer 520 may include the same material as the source electrode 137 or the drain electrode 138 described above.

[0126] The first opposing electrode 230a disposed on the display area DA may be disposed to extend to the non-display area NDA. In addition, the first and second protective layers 240 and 340 disposed on the display area DA may extend to the non-display area NDA and may contact each other on the non-display area NDA.

[0127] Reference Figure 6B , a first dam portion 610 and a second dam portion 620 may be arranged on the non-display area NDA of the display device 1 according to the embodiment. The first dam portion 610 and the second dam portion 620 may block the material of the blocking member 250 arranged on the first protective layer 240 from flowing toward the edge of the substrate 100. In addition, although not shown, when the display device 1 includes the above-mentioned thin film encapsulation layer 400, the first dam portion 610 and the second dam portion 620 may prevent the formation of an edge tail of the organic encapsulation layer 420 by blocking the organic material from flowing toward the edge of the substrate 100 when forming the organic encapsulation layer 420 of the thin film encapsulation layer 400. The first dam portion 610 and the second dam portion 620 may be arranged on the non-display area NDA to be adjacent to the periphery of the display area DA (or surround the periphery of the display area DA). Although Figure 6B It is shown that the display apparatus 1 includes two dams, but the present disclosure is not limited thereto.

[0128] Figures 7A to 7G is a schematic cross-sectional view showing a part of a process of manufacturing a display device.

[0129] In the following, reference will be made to Figures 7A to 7G A method of manufacturing a display device is described in detail.

[0130] Reference Figures 7A to 7GAccording to an embodiment, a method for manufacturing a display device may include: forming a first display device OLED1, a second display device OLED2, and a third display device OLED3 on a substrate 100; forming a first protective layer 240 on the first display device OLED1, the second display device OLED2, and the third display device OLED3; forming a blocking member 250 on the first protective layer 240, the blocking member 250 exposing a portion of the first protective layer 240 corresponding to the first display device OLED1, the second display device OLED2, and the third display device OLED3; and forming a first protective layer 240 on the first display device OLED1, the second display device OLED2, and the third display device OLED3. A first color conversion layer 310a is formed on the first protective layer 240 corresponding to D1. The first color conversion layer 310a includes first quantum dots that convert incident light into first light Lr. A second color conversion layer 310b is formed on the first protective layer 240 corresponding to the second display device OLED2. The second color conversion layer 310b includes second quantum dots that convert incident light into second light Lg. A third color conversion layer 310c is formed on the first protective layer 240 corresponding to the third display device OLED3. The third color conversion layer 310c includes light scattering particles that convert incident light into third light Lb. The first light Lr, the second light Lg, and the third light Lb can have different colors.

[0131] The substrate 100 may include a glass material. For example, the substrate 100 may include a glass material containing SiO2 as a main component. In an embodiment, the substrate 100 may include a polymer resin. The polymer resin may include at least one of polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, and cellulose acetate propionate. The substrate 100 including the polymer resin may be flexible, rollable, or bendable. The substrate 100 may have a multilayer structure including an inorganic layer (not shown) and a layer including the above-mentioned polymer resin.

[0132] Reference Figure 7AAfter preparing the substrate 100, a first display device OLED1, a second display device OLED2, and a third display device OLED3 may be formed on the substrate 100. The first display device OLED1 may include a first pixel electrode 210a, a first intermediate layer 220a, and a first opposing electrode 230a disposed to face the first pixel electrode 210a, with the first intermediate layer 220a interposed between the first pixel electrode 210a and the first opposing electrode 230a; the second display device OLED2 may include a second pixel electrode 210b, a second intermediate layer 220b, and a second opposing electrode 230b disposed to face the second pixel electrode 210b, with the second intermediate layer 220b interposed between the second pixel electrode 210b and the second opposing electrode 230b; and the third display device OLED3 may include a third pixel electrode 210c, a third intermediate layer 220c, and a third opposing electrode 230c disposed to face the third pixel electrode 210c, with the third intermediate layer 220c interposed between the third pixel electrode 210c and the third opposing electrode 230c.

[0133] The first pixel electrode 210a, the second pixel electrode 210b, and the third pixel electrode 210c may be (semi) transparent electrodes or reflective electrodes. The first pixel electrode 210a, the second pixel electrode 210b, and the third pixel electrode 210c may include a reflective layer formed of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or any compound thereof, and a transparent or semi-transparent electrode layer formed on the reflective layer. The transparent or semi-transparent electrode layer may include at least one of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO), and aluminum zinc oxide (AZO). The first pixel electrode 210a, the second pixel electrode 210b, and the third pixel electrode 210c may be provided in a stacked structure of ITO / Ag / ITO.

[0134] The first intermediate layer 220a may be disposed on the first pixel electrode 210a, the second intermediate layer 220b may be disposed on the second pixel electrode 210b, and the third intermediate layer 220c may be disposed on the third pixel electrode 210c. The first intermediate layer 220a, the second intermediate layer 220b, and the third intermediate layer 220c may include an emission layer, and functional layers such as a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL), and an electron injection layer (EIL) may optionally be further included below and above the emission layer.

[0135] The emission layer may include an organic material including a fluorescent or phosphorescent material that emits red, green, blue, or white light. The emission layer may include a low molecular weight organic material or a high molecular weight organic material. For example, the emission layer included in the first intermediate layer 220a, the second intermediate layer 220b, and the third intermediate layer 220c may include a material that emits blue light.

[0136] The first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may be arranged on the first intermediate layer 220a, the second intermediate layer 220b, and the third intermediate layer 220c, respectively. The first opposing electrode 230a may be arranged on the first intermediate layer 220a to completely cover the first intermediate layer 220a, the second opposing electrode 230b may be arranged on the second intermediate layer 220b to completely cover the second intermediate layer 220b, and the third opposing electrode 230c may be arranged on the third intermediate layer 220c to completely cover the third intermediate layer 220c. In an embodiment, the first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may be formed integrally.

[0137] The first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may include a conductive material having a low work function. For example, the first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may include a (semi-) transparent layer comprising silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), or any alloy thereof. The first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c may further include a layer such as ITO, IZO, ZnO, or In2O3 located on the (semi-) transparent layer comprising the above materials.

[0138] Reference Figure 7B After forming the first display device OLED1 , the second display device OLED2 , and the third display device OLED3 on the substrate 100 , a first protective layer 240 may be formed on the first display device OLED1 , the second display device OLED2 , and the third display device OLED3 .

[0139] The first protective layer 240 may be disposed on the first opposing electrode 230a, the second opposing electrode 230b, and the third opposing electrode 230c. The first protective layer 240 may include silicon oxide (SiO2), silicon nitride (SiN x), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiO2), tantalum oxide (Ta2O5), hafnium oxide (HfO2), and zinc oxide (ZnO2). The first protective layer 240 may include a single layer or multiple layers containing the above inorganic materials.

[0140] Reference Figure 7C After forming the first protective layer 240, a blocking member 250 exposing a portion of the first protective layer 240 corresponding to the first display device OLED1, the second display device OLED2, and the third display device OLED3 may be formed on the first protective layer 240. For example, the blocking member 250 may include an organic material such as polyimide, polyamide, acrylic resin, benzocyclobutene, hexamethyldisiloxane (HMDSO), or phenolic resin.

[0141] Reference Figure 7D After forming the blocking member 250 on the first protective layer 240, a first color conversion layer 310a may be formed on the first protective layer 240 corresponding to the first display device OLED1, the first color conversion layer 310a including first quantum dots that convert incident light into first light Lr; a second color conversion layer 310b may be formed on the first protective layer 240 corresponding to the second display device OLED2, the second color conversion layer 310b including second quantum dots that convert incident light into second light Lg; and a third color conversion layer 310c may be formed on the first protective layer 240 corresponding to the third display device OLED3, the third color conversion layer 310c including light scattering particles that convert incident light into third light Lb.

[0142] In an embodiment, first color conversion layer 310a, second color conversion layer 310b, and third color conversion layer 310c may be formed directly on first protective layer 240. Since first color conversion layer 310a, second color conversion layer 310b, and third color conversion layer 310c are formed directly on first protective layer 240, a distance between first display device OLED1 and first color conversion layer 310a, a distance between second display device OLED2 and second color conversion layer 310b, and a distance between third display device OLED3 and third color conversion layer 310c may be reduced, and thus, light efficiency of the display device may be improved.

[0143] Reference Figure 7EAfter forming the first color conversion layer 310a, the second color conversion layer 310b, and the third color conversion layer 310c, a first color filter 320a may be formed on the first color conversion layer 310a, the first color filter 320a selectively transmitting the first light Lr; and a second color filter 320b may be formed on the second color conversion layer 310b, the second color filter 320b selectively transmitting the second light Lg. The first color filter 320a may be arranged (or disposed) on the first color conversion layer 310a to selectively transmit the first light Lr generated by the first color conversion layer 310a, and the second color filter 320b may be arranged (or disposed) on the second color conversion layer 310b to selectively transmit the second light Lg generated by the second color conversion layer 310b.

[0144] Reference Figure 7F After forming first color filter 320a and second color filter 320b, third color filter 320c may be formed on third color conversion layer 310c. Third color filter 320c selectively transmits third light Lb. Third color filter 320c may be arranged (or disposed) on third color conversion layer 310c to selectively transmit third light Lb generated by third color conversion layer 310c. Third color conversion layer 310c may generate third light Lb by scattering.

[0145] When forming the third color filter 320c, a light shielding member 330 may be formed on the blocking member 250. In an embodiment, the light shielding member 330 may be formed on the blocking member 250 at the same time as the third color filter 320c. In an embodiment, a portion of the light shielding member 330 may also be formed on the first color filter 320a and the second color filter 320b. The light shielding member 330 may serve as an auxiliary light shield so that light is not emitted from the non-emitting area. The light shielding member 330 may include the same material as the third color filter 320c. In an embodiment, the light shielding member 330 and the third color filter 320c may include the same material. In an embodiment, the light shielding member 330 may include a black matrix, a black pigment, a metal material, or the like.

[0146] Reference Figure 7G After forming the third color filter 320c, a second protective layer 340 may be formed on the first color filter 320a, the second color filter 320b, and the third color filter 320c. The second protective layer 340 may include silicon oxide (SiO2), silicon nitride (SiN X ), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiO2), tantalum oxide (Ta2O5), hafnium oxide (HfO2), and zinc oxide (ZnO2). The second protective layer 340 may include a single layer or multiple layers containing the above inorganic materials.

[0147] In an embodiment, since the first protective layer 240 including an inorganic material, the blocking member 250 including an organic material, and the second protective layer 340 including an inorganic material are arranged (or set) on the first display device OLED1, the second display device OLED2, and the third display device OLED3, the first display device OLED1, the second display device OLED2, and the third display device OLED3 can be protected from the influence of external moisture and oxygen.

[0148] After forming the second protective layer 340, a thin film encapsulation layer including at least one inorganic encapsulation layer and at least one organic encapsulation layer may be formed on the second protective layer 340. In an embodiment, the thin film encapsulation layer may be formed directly on the second protective layer 340. The thin film encapsulation layer may cover the display area DA and extend to the outside of the display area DA. The thin film encapsulation layer may include at least one organic encapsulation layer and at least one inorganic encapsulation layer. For example, the thin film encapsulation layer may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. In an embodiment, when the thin film encapsulation layer is arranged directly on the color filter, the second protective layer 340 may serve as the first inorganic encapsulation layer of the thin film encapsulation layer.

[0149] According to an embodiment, in order to solve the problem of a display device in the related art in which a malfunction occurs due to misalignment when a first substrate in which a display device is arranged and a second substrate in which a color conversion layer is arranged are bonded through a bonding process or light efficiency is reduced due to a filler arranged between the first substrate and the second substrate, a display device with improved light efficiency and color reproducibility can be provided by arranging the display device and the color conversion layer adjacent to each other while sequentially arranging the display device and the color conversion layer on one substrate.

[0150] As described above, according to the embodiment, a display device with improved light efficiency can be realized by arranging the display device and the color conversion layer adjacent to each other. However, the scope of the present disclosure is not limited to these effects.

[0151] 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 generally be considered applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure.

Claims

1. A display device, wherein: The display device comprises: Substrate, including: Display area, including: A first pixel comprising a first display device; a second pixel comprising a second display device; and a third pixel comprising a third display device; and a non-display area, arranged to be adjacent to the display area; a first protective layer directly disposed on the first display device, the second display device, and the third display device; a first color conversion layer, disposed directly on the first protective layer corresponding to the first display device and comprising first quantum dots that convert incident light into first light; a second color conversion layer, disposed directly on the first protective layer corresponding to the second display device and comprising second quantum dots that convert incident light into second light; a third color conversion layer disposed directly on the first protective layer corresponding to the third display device and comprising light scattering particles for converting the incident light into third light by scattering the incident light; a barrier disposed between the first color conversion layer and the second color conversion layer, between the second color conversion layer and the third color conversion layer, and between the third color conversion layer and the first color conversion layer; a first color filter disposed directly on the first color conversion layer and selectively transmitting the first light; a second color filter disposed directly on the second color conversion layer and selectively transmitting the second light; a third color filter disposed directly on the third color conversion layer and selectively transmitting the third light; and a light shielding member, disposed on the blocking member; The first light, the second light, and the third light have different colors.

2. The display device according to claim 1, wherein The first protective layer includes an inorganic material.

3. The display device according to claim 1, wherein The barrier comprises an organic material.

4. The display device according to claim 1, in, The light blocking member and the third color filter include the same material.

5. The display device according to claim 1, wherein The display device further includes a second protective layer disposed on the first color filter, the second color filter, and the third color filter. The display device according to claim 5 , wherein: The second protective layer includes an inorganic material.

7. The display device according to claim 6, wherein The display device further includes a thin film encapsulation layer disposed on the second protective layer, wherein the thin film encapsulation layer includes at least one inorganic encapsulation layer and at least one organic encapsulation layer.

8. The display device according to claim 7, wherein The thin film encapsulation layer is directly disposed on the second protective layer.

9. The display device according to claim 1, wherein The first display device, the second display device, and the third display device each emit blue light.

10. The display device according to claim 1 or 7, wherein: The display device further includes: a first dam portion provided on the non-display area adjacent to the periphery of the display area; and The second dam portion is spaced apart from the first dam portion and is disposed adjacent to the periphery of the display area.

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