Display device

Abstract

A display device is provided. A display device includes a substrate, a plurality of sub-pixels including a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel each including a sub-pixel electrode, an emission layer disposed on the sub-pixel electrode, and an opposing electrode disposed on the emission layer, a bank layer, an encapsulation layer, and a plurality of color filters, the display device includes a bank layer including a plurality of lower openings defining an emission region in each of a plurality of sub-pixels, an encapsulation layer disposed on the bank layer and including an organic encapsulation layer, and a plurality of color filters disposed on the encapsulation layer and including a first color filter, a second color filter, and a third color filter. The first color sub-pixel includes a (1-1) th color sub-pixel and a (1-2) th color sub-pixel that emit light of the same color and are adjacent to each other, and a vertical distance between the substrate and the sub-pixel electrode of the (1-1) th color sub-pixel is different from a vertical distance between the substrate and the sub-pixel electrode of the (1-2) th color sub-pixel.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2023 - 0197216, filed with the Korean Intellectual Property Office on December 29, 2023, the content of which is incorporated herein by reference in its entirety. Technical field

[0003] One or more embodiments relate to a display device. Background art

[0004] A display device visually displays data. The display device can be used as a display unit for a miniaturized product (such as a mobile phone) or a large - sized product (such as a television).

[0005] The display device includes a plurality of sub - pixels that receive an electrical signal and emit light to display an image. Each sub - pixel includes a light - emitting element. For example, an organic light - emitting display device includes an organic light - emitting diode (OLED) as the light - emitting element. Generally, an organic light - emitting display device includes a thin - film transistor and an organic light - emitting diode disposed above a substrate, and the organic light - emitting display device operates when the organic light - emitting diode emits light. Summary of the invention

[0006] One or more embodiments include a display device having reduced visibility of multiple images caused by external light reflection and diffraction. However, this technical problem is for example, and the embodiments of the present disclosure are not necessarily limited thereto.

[0007] According to one or more embodiments, a display device includes a substrate, a plurality of sub - pixels, a bank layer, a encapsulation layer, and a plurality of color filters. The plurality of sub - pixels include a first - color sub - pixel, a second - color sub - pixel, and a third - color sub - pixel. The first - color sub - pixel, the second - color sub - pixel, and the third - color sub - pixel each include a sub - pixel electrode, an emission layer disposed on the sub - pixel electrode, and a counter electrode disposed on the emission layer. The bank layer includes a plurality of lower openings that define an emission region in each of the plurality of sub - pixels. The encapsulation layer is disposed on the bank layer and includes an organic encapsulation layer. The plurality of color filters are disposed on the encapsulation layer and include a first color filter, a second color filter, and a third color filter.

[0008] The first - color sub - pixel includes a 1 - 1 color sub - pixel and a 1 - 2 color sub - pixel that emit light of the same color and are adjacent to each other, and a vertical distance between the substrate and the sub - pixel electrode of the 1 - 1 color sub - pixel is different from a vertical distance between the substrate and the sub - pixel electrode of the 1 - 2 color sub - pixel.

[0009] The display device may further include a light - blocking layer disposed between the plurality of color filters and including a plurality of upper openings that respectively overlap the plurality of lower openings.

[0010] The display device does not include a polarizing film.

[0011] The plurality of sub-pixels may include a repetitive configuration structure of sub-pixel pattern unit blocks each including a first-color sub-pixel, a second-color sub-pixel, and a third-color sub-pixel, and the number ratio of the first-color sub-pixel, the second-color sub-pixel, and the third-color sub-pixel in the sub-pixel pattern unit block may be 2:1:1.

[0012] The difference Δhg between the first-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and the first-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel may satisfy the following equation:

[0013] where m is an integer,

[0014] n0 is the refractive index of the organic encapsulation layer, λ1 is the wavelength of light reflected by the 1-1 color sub-pixel and the 1-2 color sub-pixel in a vacuum, hg1 is the first-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel, and hg2 is the first-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel.

[0015] The first-color sub-pixel may further include a 1-3 color sub-pixel and a 1-4 color sub-pixel that emit light of the same color and are adjacent to each other, and the first-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel, the first-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel, the first-3 vertical distance from the substrate to the sub-pixel electrode of the 1-3 color sub-pixel, and the first-4 vertical distance from the substrate to the sub-pixel electrode of the 1-4 color sub-pixel may be different from each other.

[0016] The difference Δhg(1) between the first-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and the first-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel, the difference Δhg(2) between the first-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and the first-3 vertical distance from the substrate to the sub-pixel electrode of the 1-3 color sub-pixel, and the difference Δhg(3) between the first-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and the first-4 vertical distance from the substrate to the sub-pixel electrode of the 1-4 color sub-pixel may satisfy the following equations:

[0017] where m is an integer,

[0018] where m is an integer,

[0019] where m is an integer,

[0020] n0 is the refractive index of the organic encapsulation layer, λ1 is the wavelength of light reflected from the first to fourth color sub-pixels in a vacuum, hg1 is the first vertical distance from the substrate to the sub-pixel electrode of the first color sub-pixel, hg2 is the second vertical distance from the substrate to the sub-pixel electrode of the second color sub-pixel, hg3 is the third vertical distance from the substrate to the sub-pixel electrode of the third color sub-pixel, and hg4 is the fourth vertical distance from the substrate to the sub-pixel electrode of the fourth color sub-pixel.

[0021] The second color sub-pixel may include a first color sub-pixel and a second color sub-pixel that emit light of the same color and are adjacent to each other, and the first vertical distance from the substrate to the sub-pixel electrode of the first color sub-pixel may be different from the second vertical distance from the substrate to the sub-pixel electrode of the second color sub-pixel.

[0022] The third color sub-pixel may include a first color sub-pixel and a second color sub-pixel that emit light of the same color and are adjacent to each other, and the first vertical distance from the substrate to the sub-pixel electrode of the first color sub-pixel may be different from the second vertical distance from the substrate to the sub-pixel electrode of the second color sub-pixel.

[0023] The difference Δhb between the first vertical distance from the substrate to the sub-pixel electrode of the first color sub-pixel and the second vertical distance from the substrate to the sub-pixel electrode of the second color sub-pixel may satisfy the following equation:

[0024] where k is an integer,

[0025] n0 is the refractive index of the organic encapsulation layer, λ2 is the wavelength of light reflected from the first and second color sub-pixels in a vacuum, hb1 is the first vertical distance from the substrate to the sub-pixel electrode of the first color sub-pixel, and hb2 is the second vertical distance from the substrate to the sub-pixel electrode of the second color sub-pixel.

[0026] The difference Δhr between the first vertical distance from the substrate to the sub-pixel electrode of the first color sub-pixel and the second vertical distance from the substrate to the sub-pixel electrode of the second color sub-pixel may satisfy the following equation:

[0027] where l is an integer,

[0028] n0 is the refractive index of the organic encapsulation layer, λ3 is the wavelength of the light reflected by the 3-1 color sub-pixel and the 3-2 color sub-pixel in a vacuum, hr1 is the 3-1 vertical distance from the substrate to the sub-pixel electrode of the 3-1 color sub-pixel, and hr2 is the 3-2 vertical distance from the substrate to the sub-pixel electrode of the 3-2 color sub-pixel.

[0029] The plurality of sub-pixels may include a repeated configuration structure of a sub-pixel pattern unit block including a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel, and the number ratio of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel in the sub-pixel pattern unit block may be 1:1:1.

[0030] The difference Δhg between the 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and the 1-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel may satisfy the following equation:

[0031] where m is an integer,

[0032] n0 is the refractive index of the organic encapsulation layer, λ1 is the wavelength of the light reflected by the 1-1 color sub-pixel and the 1-2 color sub-pixel in a vacuum, hg1 is the 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel, and hg2 is the 1-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel.

[0033] The second color sub-pixel may include a 2-1 color sub-pixel and a 2-2 color sub-pixel that emit light of the same color and are adjacent to each other, and the 2-1 vertical distance from the substrate to the sub-pixel electrode of the 2-1 color sub-pixel may be different from the 2-2 vertical distance from the substrate to the sub-pixel electrode of the 2-2 color sub-pixel.

[0034] The third color sub-pixel may include a 3-1 color sub-pixel and a 3-2 color sub-pixel that emit light of the same color and are adjacent to each other, and the 3-1 vertical distance from the substrate to the sub-pixel electrode of the 3-1 color sub-pixel may be different from the 3-2 vertical distance from the substrate to the sub-pixel electrode of the 3-2 color sub-pixel.

[0035] The difference Δhb between the 2-1 vertical distance from the substrate to the sub-pixel electrode of the 2-1 color sub-pixel and the 2-2 vertical distance from the substrate to the sub-pixel electrode of the 2-2 color sub-pixel may satisfy the following equation:.

[0036] where k is an integer,

[0037] n0 is the refractive index of the organic encapsulation layer, λ2 is the wavelength of the light reflected by the 2-1st color sub-pixel and the 2-2nd color sub-pixel in vacuum, hb1 is the 2-1st vertical distance from the substrate to the sub-pixel electrode of the 2-1st color sub-pixel, and hb2 is the 2-2nd vertical distance from the substrate to the sub-pixel electrode of the 2-2nd color sub-pixel.

[0038] The difference Δhr between the 3-1st vertical distance from the substrate to the sub-pixel electrode of the 3-1st color sub-pixel and the 3-2nd vertical distance from the substrate to the sub-pixel electrode of the 3-2nd color sub-pixel may satisfy the following equation:

[0039] where l is an integer,

[0040] n0 is the refractive index of the organic encapsulation layer, λ3 is the wavelength of the light reflected by the 3-1st color sub-pixel and the 3-2nd color sub-pixel in vacuum, hr1 is the 3-1st vertical distance from the substrate to the sub-pixel electrode of the 3-1st color sub-pixel, and hr2 is the 3-2nd vertical distance from the substrate to the sub-pixel electrode of the 3-2nd color sub-pixel.

[0041] The first color filter, the second color filter, and the third color filter may overlap with each other in the region between the sub-pixel electrodes of the plurality of sub-pixels.

[0042] The first color sub-pixel may be an elliptical shape in a plan view, and the first color sub-pixel may include a first-axis sub-pixel and a second-axis sub-pixel having different elliptical axis angles from each other.

[0043] Each of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel may have an elliptical shape in a plan view, and at least two of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel may have different elliptical eccentricities from each other. Description of the Drawings

[0044] Figure 1 is a schematic perspective view of a display device according to an embodiment.

[0045] Figure 2 Shows the light-emitting diode of the sub-pixel of the display device according to the embodiment and the sub-pixel circuit connected thereto.

[0046] Figure 3 is according to an embodiment along Figure 1 The schematic cross-sectional view of the display device taken along the line I-I' of.

[0047] Figure 4 is a schematic cross-sectional view of a display device according to an embodiment.

[0048] Figure 5It is a schematic cross-sectional view of a display device according to an embodiment.

[0049] Figure 6 It is a plan view of the configuration of sub-pixels of a part of a display device according to an embodiment.

[0050] Figure 7 It shows a multi-image phenomenon caused by external light reflection and diffraction of a display device.

[0051] Figure 8 It is a plan view of sub-pixels of a display device according to an embodiment.

[0052] Figure 9 It is a schematic cross-sectional view of a display device according to an embodiment.

[0053] Figure 10 It is a plan view of the configuration of sub-pixels of a part of a display device according to an embodiment.

[0054] Figure 11 It is a schematic cross-sectional view of a display device according to an embodiment.

[0055] Figure 12 It is a schematic cross-sectional view of a display device according to an embodiment.

[0056] Figure 13 It is a schematic cross-sectional view of a display device according to an embodiment.

[0057] Figure 14 It is a plan view of the configuration of sub-pixels of a part of a display device according to an embodiment.

[0058] Figure 15 It is a plan view of the configuration of sub-pixels of a part of a display device according to an embodiment.

[0059] Figure 16 It is a schematic cross-sectional view of a display device according to an embodiment.

[0060] Figure 17 It is a schematic cross-sectional view of a display device according to an embodiment.

[0061] Figure 18 It is a schematic cross-sectional view of a display device according to an embodiment.

[0062] Figure 19 It is a plan view of the configuration of sub-pixels of a part of a display device according to an embodiment.

[0063] Figure 20 It is a plan view of the configuration of sub-pixels of a part of a display device according to an embodiment. Detailed implementation manners

[0064] Reference will now be made in detail to the embodiments shown in the accompanying drawings, in which the same reference numerals may refer to the same elements throughout.

[0065] However, the present disclosure is not necessarily limited to the following embodiments and may be implemented in various other forms.

[0066] Hereinafter, embodiments will be described with reference to the accompanying drawings, in which the same reference numerals may refer to the same elements throughout, and repeated descriptions thereof will be omitted.

[0067] It should also be understood that when a layer, region, or element is referred to as being "on" another layer, region, or element, it can be directly or indirectly on the other layer, region, or element.

[0068] It should be understood that when a layer, region, or element is referred to as being "connected" to another layer, region, or element, it can be "directly connected" to the other layer, region, or element, or can be "indirectly connected" to the other layer, region, or element with other layers, regions, or elements positioned therebetween.

[0069] The x-axis, y-axis, and z-axis are not limited to the three axes of a 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.

[0070] Figure 1 is a schematic perspective view of a display device according to an embodiment.

[0071] Referring to Figure 1 , in the embodiment, the display device 1 includes a display area DA and a peripheral area NDA outside the display area DA. The display device 1 can display an image by two-dimensionally arranging an array of a plurality of sub-pixels P in the display area DA.

[0072] Each sub-pixel P of the display device 1 emits light of a preset color. The display device 1 uses the light emitted from the sub-pixels P to display an image. For example, each sub-pixel P emits one of red light, green light, blue light, and white light.

[0073] Each of the plurality of sub-pixels emits light of a preset color using a light-emitting diode (such as an organic light-emitting diode). For example, each organic light-emitting diode emits one of red light, green light, blue light, and white light. Each organic light-emitting diode is connected to a sub-pixel circuit including a thin-film transistor and a capacitor.

[0074] The peripheral region NDA does not display an image and surrounds the display region DA. In an embodiment, the peripheral region NDA completely surrounds the display region DA. A driver for supplying an electrical signal to the sub-pixel circuit or a main power line for supplying power to the sub-pixel circuit is provided in the peripheral region NDA. A pad is provided in the peripheral region NDA, and an electronic component or a printed circuit board can be electrically connected to the pad.

[0075] As Figure 1 shown, the display region DA has a polygonal shape, such as a rectangular shape. For example, the display region DA can have: a rectangular shape in which its horizontal length is greater than its vertical length, a rectangular shape in which its horizontal length is less than its vertical length, or a square shape. In other embodiments, the display region DA can have various other shapes, such as an oval shape or a circular shape. In an embodiment, as Figure 1 shown, the display region DA can be positioned in a plane defined by the x-direction and the y-direction intersecting the x-direction, and the normal direction of the surface of the display region DA can be parallel to the z-direction perpendicular to the x-direction and the y-direction.

[0076] The display device 1 can be incorporated into a mobile phone, a television, a billboard, a tablet personal computer, a notebook computer, a smart watch, a smart bracelet worn on the wrist, etc.

[0077] Figure 2 Shown are a light-emitting diode of a sub-pixel of a display device according to an embodiment and a sub-pixel circuit connected thereto.

[0078] Referring Figure 2 , in an embodiment, an organic light-emitting diode OLED as a light-emitting diode is connected to the sub-pixel circuit PC. The sub-pixel circuit PC includes a first thin-film transistor T1, a second thin-film transistor T2, and a storage capacitor Cst.

[0079] The second thin-film transistor T2 is a switching thin-film transistor, connected to the scan line SL and the data line DL, and sends a data voltage to the first thin-film transistor T1 according to a switching voltage. The data voltage is received from the data line DL, and the switching voltage is received from the scan line SL. The storage capacitor Cst is connected to the second thin-film transistor T2 and the driving voltage line PL, and stores a voltage corresponding to the difference between the voltage received from the second thin-film transistor T2 and the driving voltage ELVDD received from the driving voltage line PL.

[0080] The first thin film transistor T1 is a driving thin film transistor, connected to a driving voltage line PL and a storage capacitor Cst, and controls a driving current according to the voltage stored in the storage capacitor Cst. The driving current flows from the driving voltage line PL to the organic light emitting diode OLED. The organic light emitting diode OLED emits light having a preset luminance corresponding to the driving current. A sub-pixel electrode (such as an anode) of the organic light emitting diode OLED is connected to a sub-pixel circuit PC. A counter electrode (such as a cathode) of the organic light emitting diode OLED receives a common voltage ELVSS.

[0081] Although Figure 2 the sub-pixel circuit PC is shown to include two thin film transistors and one storage capacitor, the number of thin film transistors or the number of storage capacitors can be variously changed according to the design of the sub-pixel circuit PC.

[0082] Figure 3 is a schematic cross-sectional view of a display device taken along line I-I' according to an embodiment. Figure 1 of

[0083] Referring to Figure 3 , in an embodiment, the display device 1 includes a substrate 100, a display layer 200, a low reflection layer 300, a packaging layer 400, a touch sensor layer 500, an anti-reflection layer 600, an adhesive layer OCA, and a cover window 700.

[0084] The substrate 100 includes at least one of glass and a polymer resin. For example, the polymer resin includes at least one of polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, and cellulose acetate propionate. The polymer resin substrate 100 is flexible, rollable, or bendable. The substrate 100 may have a multi-layer structure including a layer containing a polymer resin and an inorganic layer.

[0085] The display layer 200 is disposed on the substrate 100 and includes a light emitting diode, a thin film transistor, and an insulating layer therebetween. The thin film transistor is electrically connected to the light emitting diode, such as an organic light emitting diode.

[0086] The low reflection layer 300 is disposed on the display layer 200, and the packaging layer 400 is disposed on the low reflection layer 300. For example, the display layer 200 and / or the low reflection layer 300 are sealed by the packaging layer 400. In an embodiment, the low reflection layer 300 is omitted. For example, the packaging layer 400 is directly disposed on the display layer 200. The packaging layer 400 includes at least one inorganic packaging layer and at least one organic packaging layer.

[0087] In an embodiment, a packaging substrate including glass is provided to replace the packaging layer 400. The packaging substrate is disposed on the display layer 200, and the display layer 200 is disposed between the substrate 100 and the packaging substrate. A gap may exist between the packaging substrate and the display layer 200. The gap may be filled with a filling material.

[0088] The touch sensor layer 500 is disposed on the packaging layer 400. The touch sensor layer 500 is capable of sensing an external input, such as a touch of an object (such as a finger or a stylus), and the display device 1 obtains coordinate information corresponding to the position of the touch. The touch sensor layer 500 includes touch electrodes and touch lines connected to the touch electrodes. The touch sensor layer 500 senses an external input by using a self - capacitance method or a mutual - capacitance method.

[0089] The touch sensor layer 500 is directly disposed on the packaging layer 400. However, in an embodiment, the touch sensor layer 500 is separately formed and then attached to the packaging layer 400 through an adhesive layer such as an optically clear adhesive.

[0090] The anti - reflection layer 600 is disposed on the touch sensor layer 500. The anti - reflection layer 600 reduces the reflectance of external light incident on the display device 1 through the cover window 700.

[0091] The anti - reflection layer 600 includes a light - blocking layer and a color filter. The color filters are arranged according to the colors of the light emitted from the light - emitting diodes of the display layer 200, respectively.

[0092] The cover window 700 is disposed on the anti - reflection layer 600. The cover window 700 protects the layers covered by the cover window 700. The cover window 700 is separately formed and attached to the anti - reflection layer 600 through an adhesive layer OCA disposed between the cover window 700 and the anti - reflection layer 600. For example, the adhesive layer OCA may be an optically clear adhesive. However, in an embodiment, the cover window 700 is directly disposed on the anti - reflection layer 600.

[0093] Figure 4 is a schematic cross - sectional view of a display device according to an embodiment.

[0094] Refer to Figure 4 In an embodiment, the display device 1 includes a substrate 100, a display layer 200, a packaging layer 400, a touch sensor layer 500, an anti - reflection layer 600, an adhesive layer OCA, and a cover window 700.

[0095] The display device 1 includes a display area DA (refer to Figure 1) multiple sub-pixels P. Each of the multiple sub-pixels P emits one of red light, green light, and blue light. The multiple sub-pixels P include multiple sub-pixels that emit lights of different colors from each other, such as a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel. Each of the multiple first color sub-pixels, the multiple second color sub-pixels, and the multiple third color sub-pixels is provided in multiple numbers. In an embodiment, the first color sub-pixel is a green sub-pixel Pg that emits green light, the second color sub-pixel is a blue sub-pixel Pb that emits blue light, and the third color sub-pixel is a red sub-pixel Pr that emits red light.

[0096] The display layer 200 is disposed on the substrate 100. The display layer 200 includes a sub-pixel circuit layer and a light-emitting diode layer. The sub-pixel circuit layer includes a thin-film transistor TFT, a buffer layer 201 as an insulating layer, a gate insulating layer 203, an interlayer insulating layer 205, and a planarization layer 207.

[0097] The buffer layer 201 is disposed on the substrate 100, reduces or blocks the penetration of foreign substances, moisture, or external air from below the substrate 100, and provides a flat surface on the substrate 100. The buffer layer 201 includes at least one of an inorganic material, an organic material, and an organic / inorganic composite material, and may include a single layer or multiple layers including an inorganic material and an organic material, where the inorganic material includes an oxide or a nitride. A barrier layer for blocking the penetration of external air may also be disposed between the substrate 100 and the buffer layer 201. The buffer layer 201 includes at least one of silicon oxide and silicon nitride.

[0098] The thin-film transistor TFT is disposed on the buffer layer 201. The thin-film transistor TFT includes a semiconductor layer ACT, a gate electrode GE, a source electrode SE, and a drain electrode DE. The thin-film transistor TFT is connected to an organic light-emitting diode that serves as a light-emitting diode and drives the organic light-emitting diode.

[0099] The semiconductor layer ACT is disposed on the buffer layer 201. The semiconductor layer ACT includes one of polycrystalline silicon and amorphous silicon. In an embodiment, the semiconductor layer ACT includes 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). The semiconductor layer ACT includes a channel region, a source region, and a drain region, and the source region and the drain region are doped with impurities.

[0100] The gate electrode GE, source electrode SE, and drain electrode DE each include various conductive materials. In an embodiment, the gate electrode GE includes at least one of molybdenum (Mo), aluminum (Al), copper (Cu), and titanium (Ti). For example, the gate electrode GE includes one of a single Mo layer and a three-layer structure including an Mo layer, an Al layer, and an Mo layer. In an embodiment, each of the source electrode SE and the drain electrode DE includes at least one of copper (Cu), titanium (Ti), and aluminum (Al). For example, each of the source electrode SE and the drain electrode DE includes a three-layer structure of a Ti layer, an Al layer, and a Ti layer.

[0101] To insulate the semiconductor layer ACT from the gate electrode GE, a gate insulating layer 203 is provided on the buffer layer 201 and between the semiconductor layer ACT and the gate electrode GE. An interlayer insulating layer 205 is provided on the gate insulating layer 203 and the gate electrode GE, and the source electrode SE and the drain electrode DE are provided on the interlayer insulating layer 205.

[0102] Each of the gate insulating layer 203 and the interlayer insulating layer 205 includes an inorganic material, such as at least one of silicon oxide, silicon nitride, and silicon oxynitride. Each of the gate insulating layer 203 and the interlayer insulating layer 205 is formed by, for example, a chemical vapor deposition (CVD) method or an atomic layer deposition (ALD) method.

[0103] A planarization layer 207 is provided on the interlayer insulating layer 205 and the thin film transistor TFT. To provide a flat upper surface, the planarization layer 207 is formed, and then chemical mechanical polishing is performed on the upper surface of the planarization layer 207. The planarization layer 207 includes a general polymer (such as at least one of photosensitive polyimide, polyimide, polycarbonate (PC), benzocyclobutene (BCB), hexamethyldisiloxane (HMDSO), polymethyl methacrylate (PMMA), and polystyrene (PS)), a polymer derivative having a phenolic group, an acrylic-based polymer, an imide-based polymer, an aryl ether-based polymer, an amide-based polymer, a fluorine-based polymer, a parylene polymer, or a vinyl alcohol-based polymer. Although Figure 4 the planarization layer 207 is shown as a single layer, in another embodiment, the planarization layer 207 is a multi-layer structure. The sub-pixel electrodes of the first organic light-emitting diode OLED1, the second organic light-emitting diode OLED2, and the third organic light-emitting diode OLED3 are electrically connected to the thin film transistor TFT through contact holes in the planarization layer 207.

[0104] A light-emitting diode layer is provided on the sub-pixel circuit layer. In an embodiment, the light-emitting diode layer includes the first organic light-emitting diode OLED1, the second organic light-emitting diode OLED2, and the third organic light-emitting diode OLED3, a bank layer 225, and a spacer 227.

[0105] The first organic light-emitting diode OLED1, the second organic light-emitting diode OLED2, and the third organic light-emitting diode OLED3 are disposed on the sub-pixel circuit layer. The first organic light-emitting diode OLED1 includes a stacked structure of a sub-pixel electrode 210G, an intermediate layer 220G, and a counter electrode 230. The intermediate layer 220G includes a first common layer 221, an emission layer 222G, and a second common layer 223. The second organic light-emitting diode OLED2 includes a stacked structure of a sub-pixel electrode 210B, an intermediate layer 220B, and a counter electrode 230. The intermediate layer 220B includes a first common layer 221, an emission layer 222B, and a second common layer 223. The third organic light-emitting diode OLED3 includes a stacked structure of a sub-pixel electrode 210R, an intermediate layer 220R, and a counter electrode 230. The intermediate layer 220R includes a first common layer 221, an emission layer 222R, and a second common layer 223.

[0106] The sub-pixel electrodes 210G, 210B, and 210R are disposed on the planarization layer 207. The sub-pixel electrodes 210G, 210B, and 210R are spaced apart from each other.

[0107] In an embodiment, the sub-pixel electrodes 210G, 210B, and 210R are reflective electrodes. The sub-pixel electrodes 210G, 210B, and 210R include a reflective layer and a transparent or semi-transparent conductive layer on the reflective layer, where the reflective layer includes at least one of silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), and compounds thereof. The transparent or semi-transparent conductive layer includes 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).

[0108] The bank layer 225 is disposed on the sub-pixel electrodes 210G, 210B, and 210R. The bank layer 225 overlaps with the sub-pixel electrodes 210G, 210B, and 210R, and includes a first lower opening 225OP1, a second lower opening 225OP2, and a third lower opening 225OP3 that respectively expose the central portions of the sub-pixel electrodes 210G, 210B, and 210R. The bank layer 225 covers the edges of the sub-pixel electrodes 210G, 210B, and 210R, and prevents arcing and the like from occurring at the edges of the sub-pixel electrodes 210G, 210B, and 210R by increasing the distance between the edges of the sub-pixel electrodes 210G, 210B, and 210R and the counter electrode 230.

[0109] The first lower opening 225OP1, the second lower opening 225OP2, and the third lower opening 225OP3 of the bank layer 225 define a first emission region EA1 of the first organic light-emitting diode OLED1, a second emission region EA2 of the second organic light-emitting diode OLED2, and a third emission region EA3 of the third organic light-emitting diode OLED3 in corresponding sub-pixels, respectively. As Figure 4 shown in, the bank layer 225 includes a first lower opening 225OP1 that defines a first emission region EA1 of the first organic light-emitting diode OLED1 for a first color sub-pixel. In addition, the bank layer 225 includes a second lower opening 225OP2 that defines a second emission region EA2 of the second organic light-emitting diode OLED2 for a second color sub-pixel, and the bank layer 225 includes a third lower opening 225OP3 that defines a third emission region EA3 of the third organic light-emitting diode OLED3 for a third color sub-pixel.

[0110] The bank layer 225 includes an organic insulating material. In an embodiment, the bank layer 225 includes an inorganic insulating material such as silicon nitride or silicon oxide. In an embodiment, the bank layer 225 includes an organic insulating material and an inorganic insulating material.

[0111] In an embodiment, the bank layer 225 includes a light-blocking material. For example, the light-blocking material of the bank layer 225 is black. The light-blocking material includes at least one of carbon black, carbon nanotubes, a resin or paste containing a black dye, metal particles (such as nickel, aluminum, molybdenum, or their alloys), metal oxide particles, and metal nitride particles. When the bank layer 225 includes a light-blocking material, the reflection of external light by the metal structure below the bank layer 225 is reduced.

[0112] The spacer 227 is disposed on the bank layer 225. The spacer 227 includes an organic insulating material such as polyimide. In an embodiment, the spacer 227 includes an inorganic insulating material such as one of silicon nitride and silicon oxide, or includes an organic insulating material and an inorganic insulating material. In an embodiment, the spacer 227 includes a light-blocking material containing a material different from that of the bank layer 225. The spacer 227 and the bank layer 225 are formed in separate processes.

[0113] In an embodiment, the spacer 227 includes the same material as that of the bank layer 225. For example, the bank layer 225 and the spacer 227 are formed synchronously during a mask process using a halftone mask.

[0114] An intermediate layer is disposed on the sub-pixel electrodes 210G, 210B, and 210R and the bank layer 225. As described above, the intermediate layer includes a first common layer 221, an emission layer, and a second common layer 223.

[0115] The emission layers 222G, 222B, and 222R are respectively disposed inside the first lower opening 225OP1, the second lower opening 225OP2, and the third lower opening 225OP3 of the bank layer 225. The emission layers 222G, 222B, and 222R include an organic material containing a fluorescent or phosphorescent material that emits one of green light, blue light, and red light. The organic material includes a low molecular weight organic material or a polymeric organic material.

[0116] The first common layer 221 and the second common layer 223 are respectively disposed below and above the emission layer. For example, the first common layer 221 includes a hole transport layer (HTL), or includes an HTL and a hole injection layer (HIL). For example, the second common layer 223 includes an electron transport layer (ETL), or includes an ETL and an electron injection layer (EIL). In an embodiment, the second common layer 223 is omitted.

[0117] The emission layer of each sub-pixel respectively corresponds to the first lower opening 225OP1, the second lower opening 225OP2, and the third lower opening 225OP3 of the bank layer 225. However, the first common layer 221 and the second common layer 223 may each be integrally formed to completely cover the substrate 100. For example, the first common layer 221 and the second common layer 223 are each formed integrally to cover the display area DA of the substrate 100.

[0118] The opposite electrode 230 is a cathode that serves as an electron injection electrode. The opposite electrode 230 includes a conductive material having a low work function. For example, the opposite electrode 230 includes a (semi) transparent layer containing at least one of silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), and alloys thereof. In an embodiment, the opposite electrode 230 further includes a layer including ITO, IZO, ZnO, or In2O3 on the (semi) transparent layer.

[0119] In an embodiment, a capping layer 240 is further disposed on the display layer 200. The capping layer 240 is disposed on the first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3. In an embodiment, due to the principle of constructive interference, the capping layer 240 improves the light emission efficiency of the first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3.

[0120] The capping layer 240 can be an organic capping layer including an organic material, an inorganic capping layer including an inorganic material, or a composite capping layer including an organic material and an inorganic material. For example, the capping layer 240 is one of a carbocyclic compound, a heterocyclic compound, an amino group-containing compound, a porphine derivative, a phthalocyanine derivative, a naphthalocyanine derivative, an alkali metal complex, and an alkaline earth metal complex, or any combination thereof. The carbocyclic compound, the heterocyclic compound, and the amino group-containing compound can be selectively substituted with a substituent including at least one of O, N, S, Se, Si, F, Cl, Br, and I.

[0121] The encapsulation layer 400 is disposed on the capping layer 240. The encapsulation layer 400 includes at least one inorganic encapsulation layer and at least one organic encapsulation layer. For example, as Figure 4 shown, the encapsulation layer 400 includes a first inorganic encapsulation layer 410, an organic encapsulation layer 420, and a second inorganic encapsulation layer 430 that are sequentially stacked.

[0122] Each of the first inorganic encapsulation layer 410 and the second inorganic encapsulation layer 430 includes an inorganic insulating material, such as at least one of silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, titanium oxide, tantalum oxide, hafnium oxide, and zinc oxide. Each of the first inorganic encapsulation layer 410 and the second inorganic encapsulation layer 430 can have a single-layer structure or a multi-layer structure including an inorganic insulating material.

[0123] The organic encapsulation layer 420 relieves the internal stress of the first inorganic encapsulation layer 410 and / or the second inorganic encapsulation layer 430. The organic encapsulation layer 420 includes a polymer-based material. For example, the organic encapsulation layer 420 includes at least one of polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate, hexamethyldisiloxane, and acrylic-based resins (such as polymethyl methacrylate or polyacrylic acid, etc.).

[0124] The encapsulation layer 400 has a multi-layer structure of the first inorganic encapsulation layer 410, the organic encapsulation layer 420, and the second inorganic encapsulation layer 430. For example, even if cracks may occur in the encapsulation layer 400, the cracks will not propagate between the first inorganic encapsulation layer 410 and the organic encapsulation layer 420 or between the organic encapsulation layer 420 and the second inorganic encapsulation layer 430. The encapsulation layer 400 prevents or reduces the penetration of external moisture, oxygen, etc. into the display area DA.

[0125] The touch sensor layer 500 is disposed on the encapsulation layer 400. The touch sensor layer 500 includes a first touch electrode MT1, a first touch insulating layer 510, a second touch electrode MT2, and a second touch insulating layer 520. The first touch electrode MT1 is directly disposed on the encapsulation layer 400. For example, the first touch electrode MT1 is directly disposed on the second inorganic encapsulation layer 430 of the encapsulation layer 400. However, the embodiment is not necessarily limited thereto.

[0126] In an embodiment, the touch sensor layer 500 includes an insulating layer positioned between the first touch electrode MT1 and the encapsulation layer 400. For example, the insulating layer is disposed on the second inorganic encapsulation layer 430 of the encapsulation layer 400 and planarizes the surface on which the first touch electrode MT1 and the like are disposed. The insulating layer includes an inorganic insulating material such as one of silicon oxide, silicon nitride, and silicon oxynitride. In an embodiment, the insulating layer includes an organic insulating material.

[0127] The first touch insulating layer 510 is disposed on the second inorganic encapsulation layer 430 and the first touch electrode MT1. The first touch insulating layer 510 includes an inorganic material or an organic material. When the first touch insulating layer 510 includes an inorganic material, the first touch insulating layer 510 includes at least one of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, and silicon oxynitride. When the first touch insulating layer 510 includes an organic material, the first touch insulating layer 510 includes at least one of an acrylic-based resin, a methacrylic-based resin, polyisoprene, a vinyl resin, an epoxy-based resin, a urethane-based resin, a cellulose resin, and a perylene-based resin.

[0128] The second touch electrode MT2 is disposed on the first touch insulating layer 510. The second touch electrode MT2 is a sensor that senses a touch input of a user. The first touch electrode MT1 is a connector that connects the second touch electrode MT2 patterned in one direction. In an embodiment, both the first touch electrode MT1 and the second touch electrode MT2 function as sensors. For example, the first touch electrode MT1 is electrically connected to the second touch electrode MT2 through a contact hole. When both the first touch electrode MT1 and the second touch electrode MT2 function as sensors, the resistance of the touch electrode decreases, and the touch input of the user can be sensed quickly.

[0129] In an embodiment, the first touch electrode MT1 and the second touch electrode MT2 have a structure through which light emitted from the organic light-emitting diode can pass, such as a mesh structure. For example, the first touch electrode MT1 and the second touch electrode MT2 do not overlap with the emission regions of the organic light-emitting diode (e.g., the first emission region EA1, the second emission region EA2, and the third reflection region EA3).

[0130] Each of the first touch electrode MT1 and the second touch electrode MT2 includes one of a metal layer and a transparent conductive layer. The metal layer includes at least one of molybdenum (Mo), silver (Ag), titanium (Ti), copper (Cu), aluminum (Al), and alloys thereof. The transparent conductive layer includes at least one of transparent conductive oxides (such as indium tin oxide (ITO), zinc oxide (ZnO), and indium tin zinc oxide (ITZO)), conductive polymers (such as poly(3,4-ethylenedioxythiophene) (PEDOT)), metal nanowires, carbon nanotubes, or graphene.

[0131] The second touch insulating layer 520 is disposed on the first touch insulating layer 510 and the second touch electrode MT2. The second touch insulating layer 520 includes an inorganic material or an organic material. When the second touch insulating layer 520 includes an inorganic material, the second touch insulating layer 520 includes at least one of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, and silicon oxynitride. When the second touch insulating layer 520 includes an organic material, the second touch insulating layer 520 includes at least one of acrylic-based resins, methacrylic-based resins, polyisoprene, vinyl resins, epoxy-based resins, urethane-based resins, cellulose resins, and perylene-based resins.

[0132] In an embodiment, the touch sensor layer 500 includes the first touch electrode MT1, the first touch insulating layer 510, and the second touch electrode MT2, but does not include the second touch insulating layer 520. For example, the anti-reflection layer 600 has a structure that covers the second touch electrode MT2.

[0133] The anti-reflection layer 600 is disposed on the touch sensor layer 500.

[0134] Referring to Figure 4 , the anti-reflection layer 600 includes a light-blocking layer 610, a plurality of color filters, and an outer coating 630. In an embodiment, the anti-reflection layer 600 includes a first color filter 620G, a second color filter 620B, and a third color filter 620R of different colors corresponding to the first organic light-emitting diode OLED1, the second organic light-emitting diode OLED2, and the third organic light-emitting diode OLED3, respectively. Each of the first color filter 620G, the second color filter 620B, and the third color filter 620R is provided as a plurality.

[0135] The light-blocking layer 610 includes a first upper opening 610OP1, a second upper opening 610OP2, and a third upper opening 610OP3 corresponding to the first color sub-pixel to the third color sub-pixel, respectively. The light-blocking layer 610 includes a first upper opening 610OP1 corresponding to the first emission region EA1, a second upper opening 610OP2 corresponding to the second emission region EA2, and a third upper opening 610OP3 corresponding to the third emission region EA3. The light emitted from the first organic light-emitting diode OLED1, the second organic light-emitting diode OLED2, and the third organic light-emitting diode OLED3 is emitted through the first upper opening 610OP1, the second upper opening 610OP2, and the third upper opening 610OP3 of the light-blocking layer 610, respectively.

[0136] The first upper opening 610OP1 of the light-blocking layer 610 overlaps with the first lower opening 225OP1 of the bank layer 225, the second upper opening 610OP2 overlaps with the second lower opening 225OP2, and the third upper opening 610OP3 overlaps with the third lower opening 225OP3.

[0137] In this specification, the width (or size) of each sub-pixel represents the width (or size) of the emission region of the organic light-emitting diode that implements each sub-pixel, and the width (or size) of the emission region can be defined by the width (or size) of the lower opening of the bank layer 225.

[0138] In an embodiment, the width (or size) of each of the first upper opening 610OP1, the second upper opening 610OP2, and the third upper opening 610OP3 of the light-blocking layer 610 is greater than the width (or size) of the corresponding sub-pixel among the first color sub-pixel to the third color sub-pixel. For example, the width (or size) of the first upper opening 610OP1, the second upper opening 610OP2, and the third upper opening 610OP3 of the light-blocking layer 610 is greater than the width (or size) of the respective corresponding first lower opening 225OP1, second lower opening 225OP2, and third lower opening 225OP3 of the bank layer 225.

[0139] In an embodiment, the width (or size) of each of the first upper opening 610OP1, the second upper opening 610OP2, and the third upper opening 610OP3 of the light-blocking layer 610 is substantially the same as the width (or size) of the corresponding sub-pixel among the first color sub-pixel to the third color sub-pixel. For example, the width (or size) of the first upper opening 610OP1, the second upper opening 610OP2, and the third upper opening 610OP3 of the light-blocking layer 610 is substantially the same as the width (or size) of the respective corresponding first lower opening 225OP1, second lower opening 225OP2, and third lower opening 225OP3 of the bank layer 225.

[0140] The light-blocking layer 610 includes an organic insulating material. In an embodiment, the light-blocking layer 610 includes an inorganic insulating material such as silicon nitride or silicon oxide. In an embodiment, the light-blocking layer 610 includes an organic insulating material and an inorganic insulating material.

[0141] In an embodiment, the light-blocking layer 610 includes a light-blocking material. For example, the light-blocking material of the light-blocking layer 610 is black. The light-blocking material includes at least one of carbon black, carbon nanotubes, a resin or paste containing a black dye, metal particles (such as nickel, aluminum, molybdenum or their alloys), metal oxide particles, and metal nitride particles. Since the light-blocking layer 610 includes a light-blocking material, the reflection of external light by the metal structure disposed below the light-blocking layer 610 is reduced.

[0142] The first color filter 620G, the second color filter 620B, and the third color filter 620R are respectively disposed in the first upper opening 610OP1, the second upper opening 610OP2, and the third upper opening 610OP3 of the light-blocking layer 610. The first color filter 620G, the second color filter 620B, and the third color filter 620R have colors corresponding to the light emitted from the first emission region EA1, the second emission region EA2, and the third emission region EA3, respectively. In an embodiment, when the first emission region EA1 emits green light, the first color filter 620G is a green color filter, when the second emission region EA2 emits blue light, the second color filter 620B is a blue color filter, and when the third emission region EA3 emits red light, the third color filter 620R is a red color filter.

[0143] The anti-reflection layer 600 further includes an outer coating 630. The outer coating 630 is disposed on the light-blocking layer 610 and / or the first color filter 620G, the second color filter 620B, and the third color filter 620R. The outer coating 630 planarizes the upper surfaces of the light-blocking layer 610 and / or the first color filter 620G, the second color filter 620B, and the third color filter 620R. The outer coating 630 is a colorless light-transmitting layer that allows substantially all visible light frequencies to pass through it. The outer coating 630 includes a colorless light-transmitting organic material such as an acrylic-based resin.

[0144] The cover window 700 is disposed above the outer coating 630 with an adhesive layer OCA interposed therebetween.

[0145] Figure 5 is a schematic cross-sectional view of a display device according to an embodiment. Figure 5 shows Figure 4 a modified embodiment of the anti-reflection layer 600 of. Hereinafter, the differences will be mainly described.

[0146] Referring to Figure 5 , in an embodiment, the anti-reflection layer 600 only includes a plurality of color filters and does not have a light-blocking layer 610 (see Figure 4)。

[0147] In an embodiment, the second color filter 620B, the third color filter 620R, and the first color filter 620G are sequentially stacked in a direction away from the substrate 100 (+z direction).

[0148] The second color filter 620B mainly allows blue light to pass through and blocks most of the red light and green light. The second color filter 620B includes a plurality of second openings 620BOP corresponding to the first emission region EA1 and the third emission region EA3. The second color filter 620B includes a plurality of second openings 620BOP such that the green light emitted from the first emission region EA1 and the red light emitted from the third emission region EA3 are not blocked. Most of the blue light emitted from the second emission region EA2 passes through the second color filter 620B and is emitted from the second color filter 620B.

[0149] The third color filter 620R mainly allows red light to pass through and blocks most of the blue light and green light. The third color filter 620R fills some of the second openings 620BOP corresponding to the third emission region EA3 among the plurality of second openings 620BOP of the second color filter 620B and is disposed on the second color filter 620B between the emission regions. The third color filter 620R includes a plurality of third openings 620ROP corresponding to the first emission region EA1 and the second emission region EA2. The third color filter 620R includes a plurality of third openings 620ROP such that the green light emitted from the first emission region EA1 and the blue light emitted from the second emission region EA2 are not blocked. Most of the red light emitted from the third emission region EA3 passes through the third color filter 620R and is emitted from the third color filter 620R.

[0150] The first color filter 620G mainly allows green light to pass through and blocks most of the red light and blue light. The first color filter 620G fills some of the second openings 620BOP corresponding to the first emission region EA1 among the plurality of second openings 620BOP of the second color filter 620B and some of the third openings 620ROP corresponding to the first emission region EA1 among the plurality of third openings 620ROP of the third color filter 620R, and is disposed on the third color filter 620R between the emission regions. The first color filter 620G includes a plurality of first openings 620GOP corresponding to the second emission region EA2 and the third emission region EA3. The first color filter 620G includes a plurality of first openings 620GOP such that the blue light emitted from the second emission region EA2 and the red light emitted from the third emission region EA3 are not blocked. Most of the green light emitted from the first emission region EA1 can pass through the first color filter 620G and is emitted from the first color filter 620G.

[0151] The antireflection layer 600 includes a light-blocking portion BP located between the emission regions. For example, the light-blocking portion BP is disposed in a portion corresponding to the space between the first emission region EA1, the second emission region EA2, and the third emission region EA3, or the space between the subpixel electrodes 210G, 210B, and 210R. The light-blocking portion BP includes a second color filter 620B, a third color filter 620R, and a first color filter 620G that are sequentially stacked. Even without the light-blocking layer 610 including a black light-blocking material (see Figure 4 ), the light-blocking portion BP can block light. In addition, external light reflection of the display device can be reduced.

[0152] In an embodiment, the width (size) of the third opening 620ROP of the third color filter 620R overlapping with the first emission region EA1 of the first color subpixel is greater than the width (size) of the second opening 620BOP of the second color filter 620B overlapping with the first emission region EA1 of the first color subpixel. The width (size) of the first opening 620GOP of the first color filter 620G overlapping with the second emission region EA2 of the second color subpixel is greater than the width (size) of the third opening 620ROP of the third color filter 620R overlapping with the second emission region EA2 of the second color subpixel. The width (size) of the first opening 620GOP of the first color filter 620G overlapping with the third emission region EA3 of the third color subpixel is greater than the width (size) of the second opening 620BOP of the second color filter 620B overlapping with the third emission region EA3 of the third color subpixel.

[0153] Hereinafter, although the description assumes that the display device includes Figure 4 the antireflection layer 600, the same structure is also applicable to a display device including Figure 5 the antireflection layer 600.

[0154] Figure 6 is a plan view of the configuration of a subpixel that is a part of a display device according to an embodiment, and Figure 7 shows a multi-image phenomenon caused by external light reflection and diffraction of the display device.

[0155] Referring to Figure 6 , in an embodiment, the plurality of subpixels of the display device include a first color subpixel, a second color subpixel, and a third color subpixel. In an embodiment, the first color subpixel is a green subpixel Pg, the second color subpixel is a blue subpixel Pb, and the third color subpixel is a red subpixel Pr. Hereinafter, a description is made based on the assumption that the first color subpixel is a green subpixel Pg, the second color subpixel is a blue subpixel Pb, and the third color subpixel is a red subpixel Pr.

[0156] The red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg have a repeated configuration structure. In an embodiment, the red sub-pixel Pr and the blue sub-pixel Pb are arranged at the vertices of a virtual rectangle VS1 centered on one green sub-pixel Pg. The red sub-pixel Pr is respectively arranged at the opposite vertices in the diagonal direction of the virtual rectangle VS1 with the green sub-pixel Pg in between, and the blue sub-pixel Pb is respectively arranged at the opposite vertices in the diagonal direction of the virtual rectangle VS1 with the green sub-pixel Pg in between. In addition, the green sub-pixel Pg is respectively arranged at the vertices of a virtual rectangle VS2 centered on a sub-pixel (the blue sub-pixel Pb or the red sub-pixel Pr), where the sub-pixel (the blue sub-pixel Pb or the red sub-pixel Pr) is arranged at one vertex of the virtual rectangle VS1. In an embodiment, the virtual rectangles VS1 and VS2 are squares.

[0157] For example, the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg are arranged in a structure (such as a diamond pentile structure). However, the embodiment is not necessarily limited thereto. For example, as shown in the following Figure 14 the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg are arranged in a stripe structure.

[0158] The red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg each have a circular shape. However, the embodiment is not necessarily limited thereto. In an embodiment, the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg have an elliptical shape or a polygonal shape. The polygonal shape may include a shape with rounded vertices.

[0159] The red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg have different sizes (or widths) from each other. For example, the size (or width) of the green sub-pixel Pg is smaller than the sizes of the red sub-pixel Pr and the blue sub-pixel Pb. The size (or width) of the blue sub-pixel Pb is larger than the size (or width) of the red sub-pixel Pr. In an embodiment, the sizes of the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg are substantially the same. However, various modifications can be made.

[0160] The sub-pixels of the display device have a repeated configuration structure of the sub-pixel pattern unit block UA1. For example, the configurations of the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg correspond to the repeated configuration of the preset sub-pixel pattern unit block UA1. In an embodiment, the sub-pixel pattern unit block UA1 is a dummy unit block having a preset area and including the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg. The sub-pixel pattern unit block UA1 corresponds to the minimum repeated unit of the configuration pattern of the sub-pixels in the display device. For example, the sub-pixel pattern unit block UA1 is square.

[0161] In an embodiment, the sub-pixel pattern unit block UA1 includes the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg. The sum of the numbers of the red sub-pixel Pr and the blue sub-pixel Pb in the sub-pixel pattern unit block UA1 is equal to the number of the green sub-pixel Pg. For example, the number ratio of the green sub-pixel Pg, the blue sub-pixel Pb, and the red sub-pixel Pr in the sub-pixel pattern unit block UA1 is 2:1:1. Figure 6 It is shown that the sub-pixel pattern unit block UA1 includes four green sub-pixels Pg, two blue sub-pixels Pb, and two red sub-pixels Pr.

[0162] In Figure 6 the sub-pixel configuration structure, the adjacent green sub-pixels Pg are respectively arranged at the vertices of a dummy rectangle VSG centered on the red sub-pixel Pr or the blue sub-pixel Pb. The adjacent blue sub-pixels Pb are respectively arranged at the vertices of a dummy rectangle VSB centered on the red sub-pixel Pr. The adjacent red sub-pixels Pr are respectively arranged at the vertices of a dummy rectangle VSR centered on the blue sub-pixel Pb. The two adjacent green sub-pixels Pg are arranged in the x-direction or the y-direction. The two adjacent blue sub-pixels Pb are arranged in a diagonal direction inclined with respect to the x-direction or the y-direction. The two adjacent red sub-pixels Pr are arranged in a diagonal direction inclined with respect to the x-direction or the y-direction. The two adjacent blue sub-pixels Pb are arranged in a direction inclined 45° with respect to the x-direction or the y-direction. The two adjacent red sub-pixels Pr are arranged in a direction inclined 45° with respect to the x-direction or the y-direction.

[0163] In an embodiment, the first distance d1 between two adjacent green sub-pixels Pg is less than the second distance d2 between two adjacent blue sub-pixels Pb. The first distance d1 between two adjacent green sub-pixels Pg is less than the third distance d3 between two adjacent red sub-pixels Pr. The second distance d2 between two adjacent blue sub-pixels Pb is equal to the third distance d3 between two adjacent red sub-pixels Pr. For example, the first distance d1 between two adjacent green sub-pixels Pg is times the second distance d2 or times

[0164] Referring to Figure 4 , the display device 1 according to the embodiment includes a light-blocking layer 610 and / or an antireflection layer 600 including a first color filter 620G, a second color filter 620B, and a third color filter 620R. Compared with a display device including a polarizing film provided on the front surface of the substrate 100, the display device 1 including the antireflection layer 600 has high light efficiency. However, external light reflection caused by each subpixel (such as a subpixel electrode or a counter electrode of each subpixel) can increase. In addition, an interference pattern generated due to diffraction of light reflected by each subpixel can increase.

[0165] For example, Figure 7 schematically shows an image formed by light reflected or diffracted in the display device. Referring to Figure 7 , in the embodiment, a blurred diffracted image is vertically and / or horizontally shifted around a clear regular reflection image and appears around the regular reflection image , which is called a multi-image. Such a multi-image is an interference pattern generated by diffraction and interference of light reflected from each subpixel, and the angle at which the regular reflection image and the first diffracted image are separated in the vertical and / or horizontal directions is called the "separation angle", which is denoted as θ in Figure 7 .

[0166] Such an interference pattern is caused by light reflected from subpixels of the same color (such as light reflected from a green subpixel Pg, light reflected from a red subpixel Pr, or light reflected from a blue subpixel Pb). Subpixels of the same color that generate the interference pattern are arranged adjacent to each other. The interference pattern can change according to the wavelength of light reflected from each subpixel. In addition, the interference pattern can change according to the shape of the subpixel, the interval between subpixels, and the configuration structure of the subpixels. The multi-images formed by light reflected from the green subpixel Pg, the blue subpixel Pb, and the red subpixel Pr having different wavelengths have different separation angles from each other.

[0167] In Figure 6In the sub-pixel configuration structure, a first distance d1 between adjacent green sub-pixels Pg is less than a second distance d2 between adjacent blue sub-pixels Pb and a third distance d3 between adjacent red sub-pixels Pr. The adjacent green sub-pixels Pg are arranged in the x-direction and the y-direction. However, the adjacent blue sub-pixels Pb and the adjacent red sub-pixels Pr are arranged in a diagonal direction. Therefore, the separation angle of the multi-images formed by the light reflected from the green sub-pixels Pg is greater than the separation angle of the multi-images formed by the light reflected from the red sub-pixels Pr and the separation angle of the multi-images formed by the light reflected from the blue sub-pixels Pb. For example, in Figure 6 In the sub-pixel configuration structure, the separation angle of the multi-images formed by the light reflected from the green sub-pixels Pg is about 1.5 times to about 2.5 times the separation angle of the multi-images formed by the light reflected from the red sub-pixels Pr and the separation angle of the multi-images formed by the light reflected from the blue sub-pixels Pb. For example, when the difference in the separation angles of the multi-images formed by the light reflected from the green sub-pixels Pg, the blue sub-pixels Pb, and the red sub-pixels Pr is large, color separation can occur, and the visibility of the multi-images can be increased.

[0168] However, since the display device according to the embodiment includes a retardation pattern structure that allows the light reflected from adjacent green sub-pixels Pg to have a retardation that does not cancel each other out or cause constructive interference, the separation angle of the multi-images formed by the light reflected from the green sub-pixels Pg is reduced. Therefore, since the difference in the separation angles of the multi-images formed by the light reflected from the green sub-pixels Pg, the light reflected from the blue sub-pixels Pb, and the light reflected from the red sub-pixels Pr is reduced, color separation is reduced, and the visibility of the multi-images is lowered.

[0169] Figure 8 is a plan view of a sub-pixel of a display device according to an embodiment. Figure 9 is a schematic cross-sectional view of a display device according to an embodiment. Figure 8 shows based on Figure 6 The retardation pattern structure of the sub-pixel configuration structure. Figure 9 is along Figure 8 A cross-sectional view of the display device taken along line A-A' of

[0170] Referring to Figure 8 , in an embodiment, the green sub-pixel Pg of the display device 1 includes a first green sub-pixel Pg1 and a second green sub-pixel Pg2. The adjacent first green sub-pixel Pg1 and second green sub-pixel Pg2 have a retardation that does not cancel each other out and causes constructive interference.

[0171] Figure 8The phase pattern structure includes a repeated configuration structure of phase difference pattern unit blocks. The configurations of the first green sub-pixel Pg1, the second green sub-pixel Pg2, the blue sub-pixel Pb, and the red sub-pixel Pr correspond to the repeated configuration of a preset phase difference pattern unit block. In an embodiment, the phase difference pattern unit block is a dummy unit block having a preset area. The phase difference pattern unit block corresponds to the minimum repeating unit of the configuration pattern of the sub-pixels, and includes sub-pixels of the same color having a phase difference. In an embodiment, the phase difference pattern unit block is the same as the sub-pixel pattern unit block UA1.

[0172] In the repeated configuration structure of the phase difference pattern unit block (such as the sub-pixel pattern unit block UA1), the first green sub-pixel Pg1 and the second green sub-pixel Pg2 are respectively arranged at adjacent vertices in a dummy rectangle VSG centered on the red sub-pixel Pr or the blue sub-pixel Pb. The first green sub-pixel Pg1 is respectively arranged at the first pair of opposite vertices of the dummy rectangle VSG. The second green sub-pixel Pg2 is respectively arranged at the second pair of opposite vertices of the dummy rectangle VSG. In an embodiment, the first green sub-pixel Pg1 can be represented as the 1-1 color sub-pixel, and the second green sub-pixel Pg2 can be represented as the 1-2 color sub-pixel.

[0173] Figure 9 shows Figure 8 the cross-sectional structures of the first green sub-pixel Pg1 and the second green sub-pixel Pg2 of. Referring to Figure 9 In an embodiment, each of the first green sub-pixel Pg1 and the second green sub-pixel Pg2 includes a sub-pixel electrode 210G, an intermediate layer 220G, and a counter electrode 230 that form a first organic light-emitting diode OLED1. The light reflected from each sub-pixel is reflected by a metal layer (such as a sub-pixel electrode or a counter electrode) of each sub-pixel. For example, the first green light Lg1 is reflected from the sub-pixel electrode 210G of the first green sub-pixel Pg1. The second green light Lg2 is reflected from the sub-pixel electrode 210G of the second green sub-pixel Pg2.

[0174] The vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 is different from the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2. For example, the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 is greater than the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2.

[0175] In an embodiment, the thickness of the portion of the planarization layer 207 corresponding to the first green sub-pixel Pg1 is different from the thickness of the portion of the planarization layer 207 corresponding to the second green sub-pixel Pg2. For example, the thickness of the portion of the planarization layer 207 corresponding to the first green sub-pixel Pg1 is greater than the thickness of the portion of the planarization layer 207 corresponding to the second green sub-pixel Pg2.

[0176] For example, the height of the sub-pixel electrode 210G of the first green sub-pixel Pg1 with respect to the substrate 100 is different from the height of the sub-pixel electrode 210G of the second green sub-pixel Pg2 with respect to the substrate 100. For example, the height of the sub-pixel electrode 210G of the first green sub-pixel Pg1 is greater than the height of the sub-pixel electrode 210G of the second green sub-pixel Pg2. Therefore, the traveling paths of the first green light Lg1 and the second green light Lg2 reflected from the corresponding sub-pixel electrodes 210G are different from each other. For example, the traveling path of the first green light Lg1 is shorter than the traveling path of the second green light Lg2.

[0177] Since the height of the sub-pixel electrode 210G of the first green sub-pixel Pg1 with respect to the substrate 100 is different from the height of the sub-pixel electrode 210G of the second green sub-pixel Pg2 with respect to the substrate 100, the thicknesses of the organic encapsulation layer 420 covering the corresponding sub-pixel electrodes 210G are different from each other. In the traveling paths of the first green light Lg1 and the second green light Lg2, the thicknesses of the corresponding portions of the organic encapsulation layer 420 through which the first green light Lg1 and the second green light Lg2 pass are different from each other. The first green light Lg1 and the second green light Lg2 have a phase difference.

[0178] For example, when the first green light Lg1 and the second green light Lg2 have the same wavelength λ1 in a vacuum and the refractive index of the organic encapsulation layer 420 is n0, the first green light Lg1 and the second green light Lg2 have corresponding phases φ1 and φ2 when passing through the organic encapsulation layer 420, as shown in the following equations 1 and 2.

[0179]

[0180]

[0181] Here, dg1 is the thickness of the portion of the organic encapsulation layer 420 corresponding to the first green sub-pixel Pg1, and dg2 is the thickness of the portion of the organic encapsulation layer 420 corresponding to the second green sub-pixel Pg2. For example, the thickness dg1 of the portion of the organic encapsulation layer 420 corresponding to the first green sub-pixel Pg1 is less than the thickness dg2 of the portion of the organic encapsulation layer 420 corresponding to the second green sub-pixel Pg2.

[0182] Therefore, the first green light Lg1 and the second green light Lg2 have a phase difference. For example, the first green light Lg1 and the second green light Lg2 have a phase difference as represented in Equation 3 below.

[0183]

[0184] Here, Δdg is the difference in thickness of the portion of the organic encapsulation layer 420 through which the first green light Lg1 and the second green light Lg2 pass. For example, the difference in thickness Δdg of the portion of the organic encapsulation layer 420 through which the first green light Lg1 and the second green light Lg2 pass corresponds to the difference Δhg between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2. For example, Equation 3 can be expressed as Equation 4 below.

[0185]

[0186] In an embodiment, the first green light Lg1 and the second green light Lg2 have a phase difference that does not cancel each other out and exhibits constructive interference. In an embodiment, the phase difference Δφ between the first green light Lg1 and the second green light Lg2 21 satisfies Equation 5 below.

[0187] where m is an integer Equation (5)

[0188] In an embodiment, the difference Δhg between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2 satisfies Equation 6 below.

[0189] where m is an integer Equation (6)

[0190] Since the display device according to the embodiment includes a structure in which the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 is different from the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2, the first green light Lg1 and the second green light Lg2 reflected from the adjacent first green sub-pixel Pg1 and second green sub-pixel Pg2 have a phase difference that does not cancel each other out and exhibits constructive interference.

[0191] For example, since, in the display device according to the embodiment, the difference Δhg between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2 is (where m is an integer), the separation angle of the multi-images formed by the light reflected from the first green sub-pixel Pg1 and the second green sub-pixel Pg2 is reduced by approximately half. Therefore, since the difference in the separation angles of the multi-images formed by the light reflected from the green sub-pixel Pg, the light reflected from the blue sub-pixel Pb, and the light reflected from the red sub-pixel Pr is reduced, color separation is reduced. Therefore, the visibility of the multi-images is reduced.

[0192] Figure 10 is a plan view of the configuration of sub-pixels that are part of the display device according to the embodiment. Figures 11 to 13 is a schematic cross-sectional view of the display device according to the embodiment. Figure 10 shows based on Figure 6 the phase difference pattern structure of the sub-pixel configuration structure. Figure 11 is along Figure 10 the line B-B' of the schematic cross-sectional view of the display device according to the embodiment, Figure 12 is along Figure 10 the line C-C' of the schematic cross-sectional view of the display device according to the embodiment, and Figure 13 is along Figure 10 the line D-D' of the schematic cross-sectional view of the display device according to the embodiment.

[0193] Referring to Figure 10 , in the embodiment, the green sub-pixels Pg of the display device 1 include a first green sub-pixel Pg1, a second green sub-pixel Pg2, a third green sub-pixel Pg3, and a fourth green sub-pixel Pg4. The adjacent first green sub-pixel Pg1, second green sub-pixel Pg2, third green sub-pixel Pg3, and fourth green sub-pixel Pg4 have a phase difference that does not cancel each other out and exhibits constructive interference. The blue sub-pixels Pb of the display device 1 include a first blue sub-pixel Pb1 and a second blue sub-pixel Pb2. The adjacent first blue sub-pixel Pb1 and second blue sub-pixel Pb2 have a phase difference that does not cancel each other out and exhibits constructive interference. In addition, the red sub-pixels Pr of the display device 1 include a first red sub-pixel Pr1 and a second red sub-pixel Pr2. The adjacent first red sub-pixel Pr1 and second red sub-pixel Pr2 have a phase difference that does not cancel each other out and exhibits constructive interference.

[0194] Figure 10The phase pattern structure includes a repetitive configuration structure of phase difference pattern unit blocks. The configurations of the first green sub-pixel Pg1, the second green sub-pixel Pg2, the third green sub-pixel Pg3, the fourth green sub-pixel Pg4, the first blue sub-pixel Pb1, the second blue sub-pixel Pb2, the first red sub-pixel Pr1, and the second red sub-pixel Pr2 correspond to the repetitive configuration of a preset phase difference pattern unit block. In an embodiment, the phase difference pattern unit block is the same as the sub-pixel pattern unit block UA1.

[0195] In the repetitive configuration structure of the phase difference pattern unit block (such as the sub-pixel pattern unit block UA1), the first green sub-pixel Pg1 to the fourth green sub-pixel Pg4 are respectively arranged at the vertices of a virtual rectangle VSG centered on the red sub-pixel Pr or the blue sub-pixel Pb. Although Figure 10 it is shown that the first green sub-pixel Pg1 and the third green sub-pixel Pg3 are respectively arranged at the first pair of opposite vertices of the virtual rectangle VSG, and the second green sub-pixel Pg2 and the fourth green sub-pixel Pg4 are respectively arranged at the second pair of opposite vertices of the virtual rectangle VSG, the embodiment is not necessarily limited thereto. Other embodiments include various other configurations of the first green sub-pixel Pg1 to the fourth green sub-pixel Pg4 in a virtual rectangle VSG. The first blue sub-pixel Pb1 and the second blue sub-pixel Pb2 are respectively arranged at the adjacent vertices of a virtual rectangle VSB centered on the red sub-pixel Pr. In addition, the first red sub-pixel Pr1 and the second red sub-pixel Pr2 are respectively arranged at the adjacent vertices of a virtual rectangle VSR centered on the blue sub-pixel Pb.

[0196] In an embodiment, the first green sub-pixel Pg1 can be represented as the 1-1 color sub-pixel, the second green sub-pixel Pg2 can be represented as the 1-2 color sub-pixel, the third green sub-pixel Pg3 can be represented as the 1-3 color sub-pixel, and the fourth green sub-pixel Pg4 can be represented as the 1-4 color sub-pixel. In an embodiment, the first blue sub-pixel Pb1 can be represented as the 2-1 color sub-pixel, and the second blue sub-pixel Pb2 can be represented as the 2-2 color sub-pixel. In an embodiment, the first red sub-pixel Pr1 can be represented as the 3-1 color sub-pixel, and the second red sub-pixel Pr2 can be represented as the 3-2 color sub-pixel.

[0197] Figure 11 shows Figure 10 the cross-sectional structures of the first green sub-pixel Pg1, the second green sub-pixel Pg2, the third green sub-pixel Pg3, and the fourth green sub-pixel Pg4. Referring to Figure 11, in an embodiment, the first green light Lg1 is reflected from the sub-pixel electrode 210G of the first green sub-pixel Pg1. The second green light Lg2 is reflected from the sub-pixel electrode 210G of the second green sub-pixel Pg2. The third green light Lg3 is reflected from the sub-pixel electrode 210G of the third green sub-pixel Pg3. The fourth green light Lg4 is reflected from the sub-pixel electrode 210G of the fourth green sub-pixel Pg4.

[0198] The vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1, the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2, the vertical distance hg3 from the substrate 100 to the sub-pixel electrode 210G of the third green sub-pixel Pg3, and the vertical distance hg4 from the substrate 100 to the sub-pixel electrode 210G of the fourth green sub-pixel Pg4 are different from each other. For example, the vertical distances hg1, hg2, hg3, and hg4 have values that decrease in order.

[0199] In the traveling paths of the first green light Lg1, the second green light Lg2, the third green light Lg3, and the fourth green light Lg4, the thicknesses of the corresponding portions of the organic encapsulation layer 420 through which the first green light Lg1, the second green light Lg2, the third green light Lg3, and the fourth green light Lg4 pass are different from each other. Therefore, the first green light Lg1, the second green light Lg2, the third green light Lg3, and the fourth green light Lg4 have a phase difference.

[0200] For example, when the first green light Lg1, the second green light Lg2, the third green light Lg3, and the fourth green light Lg4 have the same wavelength λ1 in a vacuum and the refractive index of the organic encapsulation layer 420 is n0, the first green light Lg1, the second green light Lg2, the third green light Lg3, and the fourth green light Lg4 have phases represented by the following equations 7 to 10 when passing through the organic encapsulation layer 420.

[0201]

[0202]

[0203]

[0204]

[0205] Here, dg1 represents the thickness of the portion of the organic encapsulation layer 420 corresponding to the first green sub-pixel Pg1, dg2 represents the thickness of the portion of the organic encapsulation layer 420 corresponding to the second green sub-pixel Pg2, dg3 represents the thickness of the portion of the organic encapsulation layer 420 corresponding to the third green sub-pixel Pg3, and dg4 represents the thickness of the portion of the organic encapsulation layer 420 corresponding to the fourth green sub-pixel Pg4. For example, the thicknesses dg1, dg2, dg3, and dg4 have values that increase in order.

[0206] Therefore, the first green light Lg1, the second green light Lg2, the third green light Lg3, and the fourth green light Lg4 have a phase difference. For example, the first green light Lg1, the second green light Lg2, the third green light Lg3, and the fourth green light Lg4 have the phase differences represented by the following equations 11 to 13.

[0207]

[0208]

[0209]

[0210] Here, Δdg(1) is the difference in thickness of the portion of the organic encapsulation layer 420 through which the first green light Lg1 and the second green light Lg2 pass, Δdg(2) is the difference in thickness of the portion of the organic encapsulation layer 420 through which the first green light Lg1 and the third green light Lg3 pass, and Δdg(3) is the difference in thickness of the portion of the organic encapsulation layer 420 through which the first green light Lg1 and the fourth green light Lg4 pass.

[0211] For example, the thickness of the organic encapsulation layer 420 through which the light reflected from the sub-pixel electrode of each sub-pixel passes corresponds to the vertical distance from the substrate 100 to the sub-pixel electrode of each sub-pixel. Therefore, equations 11 to 13 can be expressed as the following equations 14 to 16.

[0212]

[0213]

[0214]

[0215] Here, Δhg(1) is the difference between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2, Δhg(2) is the difference between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg3 from the substrate 100 to the sub-pixel electrode 210G of the third green sub-pixel Pg3, and Δhg(3) is the difference between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg4 from the substrate 100 to the sub-pixel electrode 210G of the fourth green sub-pixel Pg4.

[0216] In an embodiment, the first green light Lg1 to the fourth green light Lg4 have a phase difference that does not cancel each other out and undergoes constructive interference.

[0217] In an embodiment, the phase difference Δφ between the first green light Lg1 and the second green light Lg2 21 、the phase difference Δφ between the first green light Lg1 and the third green light Lg3 31 and the phase difference Δφ between the first green light Lg1 and the fourth green light Lg4 41 satisfy the following Equation 17 to Equation 19 or the following Equation 20 to Equation 22.

[0218] where m is an integer Equation (17)

[0219] where m is an integer Equation (18)

[0220] where m is an integer Equation (19)

[0221] where m is an integer Equation (20)

[0222] where m is an integer Equation (21)

[0223] where m is an integer Equation (22)

[0224] In an embodiment, the difference Δhg(1) between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2, the difference Δhg(2) between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg3 from the substrate 100 to the sub-pixel electrode 210G of the third green sub-pixel Pg3, and the difference Δhg(3) between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg4 from the substrate 100 to the sub-pixel electrode 210G of the fourth green sub-pixel Pg4 satisfy the following Equation 23 to Equation 25 or the following Equation 26 to Equation 28.

[0225] where m is an integer Equation (23) where m is an integer Equation (24)

[0226] where m is an integer Equation (25) where m is an integer Equation (26)

[0227] where m is an integer Equation (27)

[0228] where m is an integer Equation (28)

[0229] Figure 12 shows Figure 10 the cross-sectional structures of the first blue sub-pixel Pb1 and the second blue sub-pixel Pb2. Referring to Figure 12 , each of the first blue sub-pixel Pb1 and the second blue sub-pixel Pb2 includes a sub-pixel electrode 210B, an intermediate layer 220B, and a counter electrode 230 that form the second organic light-emitting diode OLED2. The first blue light Lb1 is reflected from the sub-pixel electrode 210B of the first blue sub-pixel Pb1. The second blue light Lb2 is reflected from the sub-pixel electrode 210B of the second blue sub-pixel Pb2.

[0230] The vertical distance hb1 from the substrate 100 to the sub-pixel electrode 210B of the first blue sub-pixel Pb1 is different from the vertical distance hb2 from the substrate 100 to the sub-pixel electrode 210B of the second blue sub-pixel Pb2. For example, the vertical distance hb1 is greater than the vertical distance hb2.

[0231] In the traveling paths of the first blue light Lb1 and the second blue light Lb2, the thicknesses of the corresponding portions of the organic encapsulation layer 420 through which the first blue light Lb1 and the second blue light Lb2 pass are different from each other. Therefore, the first blue light Lb1 and the second blue light Lb2 have a phase difference.

[0232] For example, when the first blue light Lb1 and the second blue light Lb2 have the same wavelength λ2 in a vacuum and the refractive index of the organic encapsulation layer 420 is n0, the first blue light Lb1 and the second blue light Lb2 have corresponding phases represented by the following equations 29 and 30 when passing through the organic encapsulation layer 420.

[0233]

[0234]

[0235] Here, db1 is the thickness of the portion of the organic encapsulation layer 420 corresponding to the first blue sub-pixel Pb1, and db2 is the thickness of the portion of the organic encapsulation layer 420 corresponding to the second blue sub-pixel Pb2. For example, the thickness db1 is less than the thickness db2.

[0236] Therefore, the first blue light Lb1 and the second blue light Lb2 have a phase difference. For example, the first blue light Lb1 and the second blue light Lb2 have a phase difference represented by the following equation 31.

[0237]

[0238] Here, Δdb is the difference in the thicknesses of the corresponding portions of the organic encapsulation layer 420 through which the first blue light Lb1 and the second blue light Lb2 pass.

[0239] For example, the difference in the thicknesses Δdb of the corresponding portions of the organic encapsulation layer 420 through which the first blue light Lb1 and the second blue light Lb2 pass corresponds to the difference Δhb between the vertical distance hb1 from the substrate 100 to the sub-pixel electrode 210B of the first blue sub-pixel Pb1 and the vertical distance hb2 from the substrate 100 to the sub-pixel electrode 210B of the second blue sub-pixel Pb2. For example, equation 31 can be expressed as the following

[0240] Equation 32.

[0241]

[0242] In an embodiment, the first blue light Lb1 and the second blue light Lb2 have a phase difference that does not cancel each other out and exhibits constructive interference. In an embodiment, the phase difference Δφ of the first blue light Lb1 and the second blue light Lb2 21′ satisfies the following equation 33.

[0243] where k is an integer, Equation (33)

[0244] In an embodiment, the difference Δhb between the vertical distance hb1 from the substrate 100 to the sub-pixel electrode 210B of the first blue sub-pixel Pb1 and the vertical distance hb2 from the substrate 100 to the sub-pixel electrode 210B of the second blue sub-pixel Pb2 satisfies the following Equation (34).

[0245] where k is an integer, Equation (34)

[0246] Figure 13 shows Figure 10 the cross-sectional structures of the first red sub-pixel Pr1 and the second red sub-pixel Pr2. Referring to Figure 13 , in an embodiment, each of the first red sub-pixel Pr1 and the second red sub-pixel Pr2 includes a sub-pixel electrode 210R, an intermediate layer 220R, and a counter electrode 230 that form a third organic light-emitting diode OLED3. The first red light Lr1 is reflected from the sub-pixel electrode 210R of the first red sub-pixel Pr1. The second red light Lr2 is reflected from the sub-pixel electrode 210R of the second red sub-pixel Pr2.

[0247] The vertical distance hr1 from the substrate 100 to the sub-pixel electrode 210R of the first red sub-pixel Pr1 is different from the vertical distance hr2 from the substrate 100 to the sub-pixel electrode 210R of the second red sub-pixel Pr2. For example, the vertical distance hr1 is greater than the vertical distance hr2.

[0248] In the traveling paths of the first red light Lr1 and the second red light Lr2, the thicknesses of the corresponding portions of the organic encapsulation layer 420 through which the first red light Lr1 and the second red light Lr2 pass are different from each other. Therefore, the first red light Lr1 and the second red light Lr2 have a phase difference.

[0249] For example, when the first red light Lr1 and the second red light Lr2 have the same wavelength λ3 in a vacuum and the refractive index of the organic encapsulation layer 420 is n0, the first red light Lr1 and the second red light Lr2 have corresponding phases represented by the following Equations (35) and (36) when passing through the organic encapsulation layer 420.

[0250]

[0251]

[0252] Here, dr1 is the thickness of the portion of the organic encapsulation layer 420 corresponding to the first red sub-pixel Pr1, and dr2 is the thickness of the portion of the organic encapsulation layer 420 corresponding to the second red sub-pixel Pr2. For example, the thickness dr1 is less than the thickness dr2.

[0253] Therefore, the first red light Lr1 and the second red light Lr2 have a phase difference. For example, the first red light Lr1 and the second red light Lr2 have a phase difference represented by Equation 37 below.

[0254]

[0255] Here, Δdr is the difference in thickness of the corresponding portions of the organic encapsulation layer 420 through which the first red light Lr1 and the second red light Lr2 pass.

[0256] For example, the difference in thickness Δdr of the corresponding portions of the organic encapsulation layer 420 through which the first red light Lr1 and the second red light Lr2 pass corresponds to the difference Δhr between the vertical distance hr1 from the substrate 100 to the sub-pixel electrode 210R of the first red sub-pixel Pr1 and the vertical distance hr2 from the substrate 100 to the sub-pixel electrode 210R of the second red sub-pixel Pr2. For example, Equation 37 can be expressed as Equation 38 below.

[0257]

[0258] In an embodiment, the first red light Lr1 and the second red light Lr2 have a phase difference that does not cancel each other out and undergoes constructive interference. In an embodiment, the phase difference Δφ between the first red light Lr1 and the second red light Lr2 21″ satisfies Equation 39 below.

[0259] where l is an integer Equation (39)

[0260] In an embodiment, the difference Δhr between the vertical distance hr1 from the substrate 100 to the sub-pixel electrode 210R of the first red sub-pixel Pr1 and the vertical distance hr2 from the substrate 100 to the sub-pixel electrode 210R of the second red sub-pixel Pr2 satisfies Equation 40 below.

[0261] where l is an integer Equation (40)

[0262] Since the display device according to the embodiment includes a structure in which the vertical distances hg1, hg2, hg3, and hg4 from the substrate 100 to the sub-pixel electrodes 210G of the first green sub-pixel Pg1, the second green sub-pixel Pg2, the third green sub-pixel Pg3, and the fourth green sub-pixel Pg4 are different from each other, the first green lights Lg1 to Lg4 reflected from the adjacent first green sub-pixel Pg1 to the fourth green sub-pixel Pg4 have a phase difference that does not cancel each other and undergoes constructive interference.

[0263] Since the display device according to the embodiment includes a structure in which the vertical distance hb1 from the substrate 100 to the sub-pixel electrode 210B of the first blue sub-pixel Pb1 is different from the vertical distance hb2 from the substrate 100 to the sub-pixel electrode 210B of the second blue sub-pixel Pb2, the first blue light Lb1 and the second blue light Lb2 reflected from the adjacent first blue sub-pixel Pb1 and the second blue sub-pixel Pb2 have a phase difference that does not cancel each other and undergoes constructive interference.

[0264] In addition, since the display device according to the embodiment includes a structure in which the vertical distance hr1 from the substrate 100 to the sub-pixel electrode 210R of the first red sub-pixel Pr1 is different from the vertical distance hr2 from the substrate 100 to the sub-pixel electrode 210R of the second red sub-pixel Pr2, the first red light Lr1 and the second red light Lr2 reflected from the adjacent first red sub-pixel Pr1 and the second red sub-pixel Pr2 have a phase difference that does not cancel each other and undergoes constructive interference.

[0265] Therefore, all of the separation angles of the multi-images formed by the light reflected from the green sub-pixels Pg, the light reflected from the blue sub-pixels Pb, and the light reflected from the red sub-pixels Pr can be reduced. Compared with Figure 10 the above-described embodiment, the separation angle of the multi-images formed by the light reflected from the green sub-pixels Pg is reduced even more.

[0266] In addition, since the difference in the separation angles of the multi-images formed by the light reflected from the green sub-pixels Pg, the light reflected from the blue sub-pixels Pb, and the light reflected from the red sub-pixels Pr is reduced, color separation is reduced. Therefore, the visibility of the multi-images is reduced.

[0267] Figure 14 is a plan view of the configuration of sub-pixels that are part of the display device according to the embodiment.

[0268] Refer to Figure 14, in an embodiment, the multiple sub-pixels of the display device include a green sub-pixel Pg, a blue sub-pixel Pb, and a red sub-pixel Pr. The red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg have a repeated configuration structure. Sub-pixels of one color are arranged in the same column. For example, the red sub-pixel Pr is arranged in the first column c1, the green sub-pixel Pg is arranged in the second column c2, and the blue sub-pixel Pb is arranged in the third column c3. The red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg are arranged in sequence in the same row. For example, the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg are arranged in a stripe structure.

[0269] The sub-pixels of the display device have a repeated configuration structure of the sub-pixel pattern unit block UB1. For example, the configurations of the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg correspond to the repeated configuration of a preset sub-pixel pattern unit block UB1. For example, the sub-pixel pattern unit block UB1 is square.

[0270] In an embodiment, the sub-pixel pattern unit block UB1 includes a red sub-pixel Pr, a blue sub-pixel Pb, and a green sub-pixel Pg. The numbers of the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg in the sub-pixel pattern unit block UB1 are the same. For example, the number ratio of the red sub-pixel Pr, the blue sub-pixel Pb, and the green sub-pixel Pg in the sub-pixel pattern unit block UB1 is 1:1:1. Figure 14 It is shown that the sub-pixel pattern unit block UB1 includes one red sub-pixel Pr, one blue sub-pixel Pb, and one green sub-pixel Pg, and forms one pixel.

[0271] In Figure 14 the sub-pixel configuration structure of, adjacent green sub-pixels Pg are respectively arranged at the vertices of a virtual rectangle VSG'. Adjacent blue sub-pixels Pb are respectively arranged at the vertices of a virtual rectangle VSB'. Adjacent red sub-pixels Pr are respectively arranged at the vertices of a virtual rectangle VSR'. Adjacent green sub-pixels Pg are arranged side by side in the x-direction and the y-direction. Adjacent blue sub-pixels Pb are arranged in the x-direction and the y-direction. Adjacent red sub-pixels Pr are arranged in the x-direction and the y-direction. In an embodiment, the virtual rectangles VSG', VSB', and VSR' are square.

[0272] In an embodiment, a first distance d1' between two adjacent green sub-pixels Pg, a second distance d2' between two adjacent blue sub-pixels Pb, and a third distance d3' between two adjacent red sub-pixels Pr are substantially equal to each other.

[0273] Considering the intervals between sub-pixels and the sub-pixel configuration structure, compared with the sub-pixel configuration structure of Figure 6 inFigure 14 In the sub-pixel structure, the separation angles of the multi-images formed by the light reflected from the green sub-pixel Pg, the separation angles of the multi-images formed by the light reflected from the red sub-pixel Pr, and the separation angles of the multi-images formed by the light reflected from the blue sub-pixel Pb are relatively similar to each other.

[0274] Figure 15 is a plan view of the configuration of sub-pixels that are part of a display device according to an embodiment. Figure 16 is a schematic cross-sectional view of a display device according to an embodiment, Figure 17 is a schematic cross-sectional view of a display device according to an embodiment, and Figure 18 is a schematic cross-sectional view of a display device according to an embodiment. Figure 15 shows based on Figure 14 the retardation pattern structure of the sub-pixel configuration structure. Figure 16 is along Figure 15 the cross-sectional view of a display device according to an embodiment taken along line E-E' of Figure 17 is along Figure 15 the cross-sectional view of a display device according to an embodiment taken along line F-F' of Figure 18 is along Figure 15 the cross-sectional view of a display device according to an embodiment taken along line G-G' of

[0275] Referring to Figure 15 , in an embodiment, the green sub-pixel Pg of the display device 1 includes a first green sub-pixel Pg1 and a second green sub-pixel Pg2. The first green sub-pixel Pg1 and the second green sub-pixel Pg2 adjacent to each other have a phase difference that does not cancel each other out and exhibits constructive interference. The blue sub-pixel Pb of the display device 1 includes a first blue sub-pixel Pb1 and a second blue sub-pixel Pb2. The first blue sub-pixel Pb1 and the second blue sub-pixel Pb2 adjacent to each other have a phase difference that does not cancel each other out and exhibits constructive interference. In addition, the red sub-pixel Pr of the display device 1 includes a first red sub-pixel Pr1 and a second red sub-pixel Pr2. The first red sub-pixel Pr1 and the second red sub-pixel Pr2 adjacent to each other have a phase difference that does not cancel each other out and exhibits constructive interference.

[0276] Figure 15The phase pattern structure includes a repetitive configuration structure of phase difference pattern unit blocks UB2. The configurations of the first green sub-pixel Pg1, the second green sub-pixel Pg2, the first blue sub-pixel Pb1, the second blue sub-pixel Pb2, the first red sub-pixel Pr1, and the second red sub-pixel Pr2 correspond to the repetitive configuration of a preset phase difference pattern unit block UB2. In an embodiment, the phase difference pattern unit block UB2 is a repetitive configuration of a sub-pixel pattern unit block UB1, and the phase difference pattern unit block UB2 has a size that is an integer multiple of the size of the sub-pixel pattern unit block UB1. For example, the phase difference pattern unit block UB2 has a size that is 2×2 times the size of the sub-pixel pattern unit block UB1.

[0277] In the repetitive configuration structure of the phase difference pattern unit block UB2, the first green sub-pixel Pg1 and the second green sub-pixel Pg2 can be respectively arranged at opposite vertices of a virtual rectangle VSG'. The first blue sub-pixel Pb1 and the second blue sub-pixel Pb2 can be respectively arranged at opposite vertices of a virtual rectangle VSB'. The first red sub-pixel Pr1 and the second red sub-pixel Pr2 can be respectively arranged at opposite vertices of a virtual rectangle VSR'.

[0278] For example, the phase difference pattern unit block UB2 has 2 rows and 6 columns. The first red sub-pixel Pr1 is arranged in the first column c1 of the first row r1 and the fourth column c4 of the second row r2. The second red sub-pixel Pr2 is arranged in the fourth column c4 of the first row r1 and the first column c1 of the second row r2. The first green sub-pixel Pg1 is arranged in the second column c2 of the first row r1 and the fifth column c5 of the second row r2, and the second green sub-pixel Pg2 is arranged in the fifth column c5 of the first row r1 and the second column c2 of the second row r2. The first blue sub-pixel Pb1 is arranged in the third column c3 of the first row r1 and the sixth column c6 of the second row r2, and the second blue sub-pixel Pb2 is arranged in the sixth column c6 of the first row r1 and the third column c3 of the second row r2.

[0279] In an embodiment, the first green sub-pixel Pg1 can be represented as the 1-1 color sub-pixel, and the second green sub-pixel Pg2 can be represented as the 1-2 color sub-pixel. The first blue sub-pixel Pb1 can be represented as the 2-1 color sub-pixel, and the second blue sub-pixel Pb2 can be represented as the 2-2 color sub-pixel. The first red sub-pixel Pr1 can be represented as the 3-1 color sub-pixel, and the second red sub-pixel Pr2 can be represented as the 3-2 color sub-pixel.

[0280] Figure 16 Shows according to an embodiment Figure 15Cross-sectional structures of the first green sub-pixel Pg1 and the second green sub-pixel Pg2. The first green light Lg1 is reflected from the sub-pixel electrode 210G of the first green sub-pixel Pg1. The second green light Lg2 is reflected from the sub-pixel electrode 210G of the second green sub-pixel Pg2.

[0281] The vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 is different from the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2. For example, the vertical distance hg1 is greater than the vertical distance hg2.

[0282] The first green light Lg1 and the second green light Lg2 have a phase difference Δφ 21 . For example, the first green light Lg1 and the second green light Lg2 have a phase difference as represented by Equation 41 below.

[0283]

[0284] Here, φ1 is the phase of the first green light Lg1, φ2 is the phase of the second green light Lg2, λ1 is the wavelength of the first green light Lg1 and the second green light Lg2 in vacuum, n0 is the refractive index of the organic encapsulation layer 420, and Δhg is the difference between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2.

[0285] In an embodiment, the first green light Lg1 and the second green light Lg2 have a phase difference that does not cancel each other out and results in constructive interference. In an embodiment, the phase difference Δφ between the first green light Lg1 and the second green light Lg2 21 satisfies Equation 42 below.

[0286] where m is an integer Equation (42)

[0287] In an embodiment, the difference Δhg between the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 and the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2 satisfies Equation 43 below.

[0288] where m is an integer Equation (43)

[0289] Figure 17 Shows according to an embodiment Figure 15The cross-sectional structures of the first blue sub-pixel Pb1 and the second blue sub-pixel Pb2. The first blue light Lb1 is reflected from the sub-pixel electrode 210B of the first blue sub-pixel Pb1. The second blue light Lb2 is reflected from the sub-pixel electrode 210B of the second blue sub-pixel Pb2.

[0290] The vertical distance hb1 from the substrate 100 to the sub-pixel electrode 210B of the first blue sub-pixel Pb1 is different from the vertical distance hb2 from the substrate 100 to the sub-pixel electrode 210B of the second blue sub-pixel Pb2. For example, the vertical distance hb1 is greater than the vertical distance hb2.

[0291] The first blue light Lb1 and the second blue light Lb2 have a phase difference Δφ 21′ . For example, the first blue light Lb1 and the second blue light Lb2 have a phase difference represented by Equation 44 below.

[0292]

[0293] Here, φ 1′ is the phase of the first blue light Lb1, φ 2′ is the phase of the second blue light Lb2, λ2 is the wavelength of the first blue light Lb1 and the second blue light Lb2 in vacuum, n0 is the refractive index of the organic encapsulation layer 420, and Δhb is the difference between the vertical distance hb1 from the substrate 100 to the sub-pixel electrode 210B of the first blue sub-pixel Pb1 and the vertical distance hb2 from the substrate 100 to the sub-pixel electrode 210B of the second blue sub-pixel Pb2.

[0294] In an embodiment, the first blue light Lb1 and the second blue light Lb2 have a phase difference that does not cancel each other out and undergoes constructive interference. In an embodiment, the phase difference Δφ 21′ of the first blue light Lb1 and the second blue light Lb2 satisfies Equation 45 below.

[0295] where k is an integer Equation (45)

[0296] In an embodiment, the difference Δhb between the vertical distance hb1 from the substrate 100 to the sub-pixel electrode 210B of the first blue sub-pixel Pb1 and the vertical distance hb2 from the substrate 100 to the sub-pixel electrode 210B of the second blue sub-pixel Pb2 satisfies Equation 46 below.

[0297] where k is an integer Equation (46)

[0298] Figure 18 Shows according to an embodiment of Figure 15The cross-sectional structures of the first red sub-pixel Pr1 and the second red sub-pixel Pr2. The first red light Lr1 is reflected from the sub-pixel electrode 210R of the first red sub-pixel Pr1. The second red light Lr2 is reflected from the sub-pixel electrode 210R of the second red sub-pixel Pr2.

[0299] The vertical distance hr1 from the substrate 100 to the sub-pixel electrode 210R of the first red sub-pixel Pr1 is different from the vertical distance hr2 from the substrate 100 to the sub-pixel electrode 210R of the second red sub-pixel Pr2. For example, the vertical distance hr1 is greater than the vertical distance hr2.

[0300] The first red light Lr1 and the second red light Lr2 have a phase difference Δφ 21″ . For example, the first red light Lr1 and the second red light Lr2 have a phase difference as represented by Equation 47 below.

[0301]

[0302] Here, φ 1″ is the phase of the first red light Lr1, φ 2″ is the phase of the second red light Lr2, λ3 is the wavelength of the first red light Lr1 and the second red light Lr2 in a vacuum, n0 is the refractive index of the organic encapsulation layer 420, and Δhr is the difference between the vertical distance hr1 from the substrate 100 to the sub-pixel electrode 210R of the first red sub-pixel Pr1 and the vertical distance hr2 from the substrate 100 to the sub-pixel electrode 210R of the second red sub-pixel Pr2.

[0303] In an embodiment, the first red light Lr1 and the second red light Lr2 have a phase difference that does not cancel each other out and exhibits constructive interference. In an embodiment, the phase difference Δφ 21″ between the first red light Lr1 and the second red light Lr2 satisfies Equation 48 below.

[0304] where l is an integer Equation (48)

[0305] In an embodiment, the difference Δhr between the vertical distance hr1 from the substrate 100 to the sub-pixel electrode 210R of the first red sub-pixel Pr1 and the vertical distance hr2 from the substrate 100 to the sub-pixel electrode 210R of the second red sub-pixel Pr2 satisfies Equation 49 below.

[0306] where l is an integer Equation (49)

[0307] Since the display device according to the embodiment includes a structure in which the vertical distance hg1 from the substrate 100 to the sub-pixel electrode 210G of the first green sub-pixel Pg1 is different from the vertical distance hg2 from the substrate 100 to the sub-pixel electrode 210G of the second green sub-pixel Pg2, the first green light Lg1 and the second green light Lg2 reflected from the adjacent first green sub-pixel Pg1 and second green sub-pixel Pg2 have a phase difference that does not cancel each other out and exhibits constructive interference.

[0308] Since the display device according to the embodiment includes a structure in which the vertical distance hb1 from the substrate 100 to the sub-pixel electrode 210B of the first blue sub-pixel Pb1 is different from the vertical distance hb2 from the substrate 100 to the sub-pixel electrode 210B of the second blue sub-pixel Pb2, the first blue light Lb1 and the second blue light Lb2 reflected from the adjacent first blue sub-pixel Pb1 and second blue sub-pixel Pb2 have a phase difference that does not cancel each other out and exhibits constructive interference.

[0309] In addition, since the display device according to the embodiment includes a structure in which the vertical distance hr1 from the substrate 100 to the sub-pixel electrode 210R of the first red sub-pixel Pr1 is different from the vertical distance hr2 from the substrate 100 to the sub-pixel electrode 210R of the second red sub-pixel Pr2, the first red light Lr1 and the second red light Lr2 reflected from the adjacent first red sub-pixel Pr1 and second red sub-pixel Pr2 have a phase difference that does not cancel each other out and exhibits constructive interference.

[0310] Therefore, all of the separation angles of the multi-images formed by the light reflected from the green sub-pixel Pg, the light reflected from the blue sub-pixel Pb, and the light reflected from the red sub-pixel Pr can be reduced. Therefore, since the difference in the separation angles of the multi-images formed by the light reflected from the green sub-pixel Pg, the light reflected from the blue sub-pixel Pb, and the light reflected from the red sub-pixel Pr is reduced even more, color separation is reduced. Therefore, the visibility of the multi-images is reduced.

[0311] Figure 19 is a plan view of the configuration of sub-pixels that are part of the display device according to the embodiment, and Figure 20 is a plan view of the configuration of sub-pixels that are part of the display device according to the embodiment.

[0312] Figure 19 and Figure 20 is Figure 6 a modified embodiment of the sub-pixel configuration structure and is different in terms of the planar shapes of the green sub-pixel Pg, the blue sub-pixel Pb, and the red sub-pixel Pr. The phase difference pattern structure described above with reference to Figures 8 to 13 is applicable to Figure 19 and Figure 20Sub - pixel configuration structure.

[0313] Referring to Figure 19 , in an embodiment, the green sub - pixel Pg of the display device 1 has an elliptical shape. The green sub - pixel Pg includes a plurality of green sub - pixels Pg having different elliptical axis angles. In an embodiment, the green sub - pixel Pg includes a first - axis green sub - pixel Pg - 1, a second - axis green sub - pixel Pg - 2, a third - axis green sub - pixel Pg - 3, and a fourth - axis green sub - pixel Pg - 4. The first - axis green sub - pixel Pg - 1 to the fourth - axis green sub - pixel Pg - 4 have different elliptical axis angles, such as major - axis angles. For example, the major axis of the first - axis green sub - pixel Pg - 1 has an angle of about 45° relative to the x - axis, the major axis of the second - axis green sub - pixel Pg - 2 is parallel to the x - axis, the major axis of the third - axis green sub - pixel Pg - 3 has an angle of about - 45° relative to the x - axis, and the major axis of the fourth - axis green sub - pixel Pg - 4 has an angle of about 90° relative to the x - axis.

[0314] Although Figure 19 shows the first - axis green sub - pixel Pg - 1 to the fourth - axis green sub - pixel Pg - 4 having an elliptical shape with four different axis angles, the embodiment is not necessarily limited thereto. For example, the green sub - pixel Pg may include an ellipse having two or more and less than four, or more than four different axis angles.

[0315] Figure 19 Describes the green sub - pixel Pg having an elliptical shape as an example. Although not shown, in an embodiment, the blue sub - pixel Pb or the red sub - pixel Pr may have an elliptical shape. In this case, Figure 19 the description of the green sub - pixel Pg in

[0316] Referring to Figure 20 , in an embodiment, at least two of the green sub - pixel Pg, the blue sub - pixel Pb, and the red sub - pixel Pr have an elliptical shape. For example, each of the green sub - pixel Pg, the blue sub - pixel Pb, and the red sub - pixel Pr has an elliptical shape.

[0317] In an embodiment, at least two of the green sub - pixel Pg, the red sub - pixel Pr, and the blue sub - pixel Pb have an elliptical shape with different eccentricities. For example, the green sub - pixel Pg has an eccentricity different from that of the red sub - pixel Pr and the blue sub - pixel Pb. For example, the eccentricity of the shape of the green sub - pixel Pg is less than the eccentricities of the shapes of the red sub - pixel Pr and the blue sub - pixel Pb. For example, the eccentricity of the green sub - pixel Pg is about 0.6, and the eccentricities of the red sub - pixel Pr and the blue sub - pixel Pb are about 0.8.

[0318] The green sub-pixel Pg includes a plurality of green sub-pixels Pg having different elliptical axis angles. The blue sub-pixel Pb includes a plurality of blue sub-pixels Pb having different elliptical axis angles. The red sub-pixel Pr includes a plurality of red sub-pixels Pr having different elliptical axis angles.

[0319] In an embodiment, the green sub-pixel Pg includes a first-axis green sub-pixel Pg-1 and a second-axis green sub-pixel Pg-2 having different elliptical axis angles. The blue sub-pixel Pb includes a first-axis blue sub-pixel Pb-1 and a second-axis blue sub-pixel Pb-2 having different elliptical axis angles. The red sub-pixel Pr includes a first-axis red sub-pixel Pr-1 and a second-axis red sub-pixel Pr-2 having different elliptical axis angles. The elliptical axis angle is the rotation angle of the elliptical axis relative to the x-axis. For example, the major axis of the first-axis green sub-pixel Pg-1 has an angle of about 45° relative to the x-axis, and the major axis of the second-axis green sub-pixel Pg-2 has an angle of about -45° relative to the x-axis. The major axis of the first-axis blue sub-pixel Pb-1 has an angle of about 90° relative to the x-axis, and the major axis of the second-axis blue sub-pixel Pb-2 is parallel to the x-axis. The major axis of the first-axis red sub-pixel Pr-1 has an angle of about 90° relative to the x-axis, and the major axis of the second-axis red sub-pixel Pr-2 is parallel to the x-axis.

[0320] In an embodiment, the first-axis green sub-pixel Pg-1 and the second-axis green sub-pixel Pg-2 are regularly arranged. The first-axis blue sub-pixel Pb-1 and the second-axis blue sub-pixel Pb-2 are regularly arranged. The first-axis red sub-pixel Pr-1 and the second-axis red sub-pixel Pr-2 are regularly arranged. The configuration of the first-axis green sub-pixel Pg-1, the second-axis green sub-pixel Pg-2, the first-axis blue sub-pixel Pb-1, the second-axis blue sub-pixel Pb-2, the first-axis red sub-pixel Pr-1, and the second-axis red sub-pixel Pr-2 corresponds to the repeated configuration of a shape pattern unit block having a size that is an integer multiple of the size of a preset sub-pixel pattern unit block UA1. For example, the shape pattern unit block corresponds to the sub-pixel pattern unit block UA1. However, the embodiment is not necessarily limited thereto. In an embodiment, the first-axis green sub-pixel Pg-1 and the second-axis green sub-pixel Pg-2 are irregularly arranged, the first-axis blue sub-pixel Pb-1 and the second-axis blue sub-pixel Pb-2 are irregularly arranged, and the first-axis red sub-pixel Pr-1 and the second-axis red sub-pixel Pr-2 are irregularly arranged.

[0321] When elliptical sub-pixels having the same axis angle and eccentricity are regularly arranged, light blurring and multi-image phenomena may occur due to diffraction of light reflected in the short-axis direction of the ellipse. A display device having at least some elliptical-shaped sub-pixels according to an embodiment may include a plurality of sub-pixels having different elliptical axis angles, and the plurality of sub-pixels may be regularly or irregularly arranged. Further, in the display device according to the embodiment, among the green sub-pixels, blue sub-pixels, and red sub-pixels, at least two colors of sub-pixels have elliptical shapes with eccentricities different from each other. Accordingly, multi-images formed by light reflected from the corresponding sub-pixels can be reduced.

[0322] According to an embodiment, there is provided a display device having reduced visibility of multi-images caused by external light reflection and diffraction. However, the scope of the embodiments of the present disclosure is not limited by this effect.

[0323] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. The description of features or aspects within each embodiment should generally be considered as available for other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the figures, those of ordinary skill in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope as defined by the appended claims.

Claims

1. A display device, comprising: a substrate; a plurality of sub-pixels, the plurality of sub-pixels including a first-color sub-pixel, a second-color sub-pixel, and a third-color sub-pixel, the first-color sub-pixel, the second-color sub-pixel, and the third-color sub-pixel each including a sub-pixel electrode, an emission layer disposed on the sub-pixel electrode, and a counter electrode disposed on the emission layer; a bank layer, the bank layer including a plurality of lower openings defining emission regions in each of the plurality of sub-pixels; a encapsulation layer, the encapsulation layer disposed on the bank layer and including an organic encapsulation layer; and a plurality of color filters, the plurality of color filters disposed on the encapsulation layer and including a first color filter, a second color filter, and a third color filter, wherein the first-color sub-pixel includes a 1-1 color sub-pixel and a 1-2 color sub-pixel that emit light of the same color and are adjacent to each other, and a vertical distance between the substrate and the sub-pixel electrode of the 1-1 color sub-pixel is different from a vertical distance between the substrate and the sub-pixel electrode of the 1-2 color sub-pixel.

2. The display device according to claim 1, further comprising a light-blocking layer, the light-blocking layer disposed between the plurality of color filters and including a plurality of upper openings respectively overlapping the plurality of lower openings.

3. The display device according to claim 1 or 2, wherein, The display device does not include a polarizing film.

4. The display device according to claim 1 or 2, wherein, the plurality of sub-pixels include a repetitive configuration structure of sub-pixel pattern unit blocks, the sub-pixel pattern unit blocks including the first-color sub-pixel, the second-color sub-pixel, and the third-color sub-pixel, and a quantity ratio of the first-color sub-pixel, the second-color sub-pixel, and the third-color sub-pixel in the sub-pixel pattern unit block is 2:1:

1.

5. The display device according to claim 4, wherein, a difference Δhg between a 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and a 1-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel satisfies the following equation: where m is an integer, n0 is a refractive index of the organic encapsulation layer, λ1 is a wavelength of light reflected by the 1-1 color sub-pixel and the 1-2 color sub-pixel in vacuum, hg1 is the 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel, and hg2 is the 1-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel.

6. The display device according to claim 4, wherein, the first-color sub-pixel further includes a 1-3 color sub-pixel and a 1-4 color sub-pixel that emit light of the same color and are adjacent to each other, and The 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel, the 1-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel, the 1-3 vertical distance from the substrate to the sub-pixel electrode of the 1-3 color sub-pixel, and the 1-4 vertical distance from the substrate to the sub-pixel electrode of the 1-4 color sub-pixel are different from each other.

7. The display device according to claim 6, wherein The difference Δhg(1) between the 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and the 1-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel, the difference Δhg(2) between the 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and the 1-3 vertical distance from the substrate to the sub-pixel electrode of the 1-3 color sub-pixel, and the difference Δhg(3) between the 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel and the 1-4 vertical distance from the substrate to the sub-pixel electrode of the 1-4 color sub-pixel satisfy the following equation: where m is an integer, where m is an integer, where m is an integer, wherein, n0 is the refractive index of the organic encapsulation layer, λ1 is the wavelength of light reflected from the 1-1 color sub-pixel to the 1-4 color sub-pixel in a vacuum, hg1 is the 1-1 vertical distance from the substrate to the sub-pixel electrode of the 1-1 color sub-pixel, hg2 is the 1-2 vertical distance from the substrate to the sub-pixel electrode of the 1-2 color sub-pixel, hg3 is the 1-3 vertical distance from the substrate to the sub-pixel electrode of the 1-3 color sub-pixel, and hg4 is the 1-4 vertical distance from the substrate to the sub-pixel electrode of the 1-4 color sub-pixel.

8. The display device according to claim 4, wherein The second color sub-pixel includes a 2-1 color sub-pixel and a 2-2 color sub-pixel that emit light of the same color and are adjacent to each other, and The 2-1 vertical distance from the substrate to the sub-pixel electrode of the 2-1 color sub-pixel is different from the 2-2 vertical distance from the substrate to the sub-pixel electrode of the 2-2 color sub-pixel.

9. The display device according to claim 4, wherein The third color sub-pixel includes a 3-1 color sub-pixel and a 3-2 color sub-pixel that emit light of the same color and are adjacent to each other, and The 3-1 vertical distance from the substrate to the sub-pixel electrode of the 3-1 color sub-pixel is different from the 3-2 vertical distance from the substrate to the sub-pixel electrode of the 3-2 color sub-pixel.

10. The display device according to claim 8, wherein The difference Δhb between the 2-1st vertical distance from the substrate to the sub-pixel electrode of the 2-1st color sub-pixel and the 2-2nd vertical distance from the substrate to the sub-pixel electrode of the 2-2nd color sub-pixel satisfies the following equation: where k is an integer, n0 is the refractive index of the organic encapsulation layer, λ2 is the wavelength of light reflected by the 2-1st color sub-pixel and the 2-2nd color sub-pixel in vacuum, hb1 is the 2-1st vertical distance from the substrate to the sub-pixel electrode of the 2-1st color sub-pixel, and hb2 is the 2-2nd vertical distance from the substrate to the sub-pixel electrode of the 2-2nd color sub-pixel.

11. The display device according to claim 9, wherein The difference Δhr between the 3-1st vertical distance from the substrate to the sub-pixel electrode of the 3-1st color sub-pixel and the 3-2nd vertical distance from the substrate to the sub-pixel electrode of the 3-2nd color sub-pixel satisfies the following equation: where l is an integer, n0 is the refractive index of the organic encapsulation layer, λ3 is the wavelength of light reflected by the 3-1st color sub-pixel and the 3-2nd color sub-pixel in vacuum, hr1 is the 3-1st vertical distance from the substrate to the sub-pixel electrode of the 3-1st color sub-pixel, and hr2 is the 3-2nd vertical distance from the substrate to the sub-pixel electrode of the 3-2nd color sub-pixel.

12. The display device according to claim 1 or 2, wherein The plurality of sub-pixels includes a repetitive configuration structure of sub-pixel pattern unit blocks, the sub-pixel pattern unit blocks include the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel, and The quantity ratio of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel in the sub-pixel pattern unit block is 1:1:

1.

13. The display device according to claim 12, wherein The difference Δhg between the 1-1st vertical distance from the substrate to the sub-pixel electrode of the 1-1st color sub-pixel and the 1-2nd vertical distance from the substrate to the sub-pixel electrode of the 1-2nd color sub-pixel satisfies the following equation; where m is an integer, n0 is the refractive index of the organic encapsulation layer, λ1 is the wavelength of light reflected by the 1-1st color sub-pixel and the 1-2nd color sub-pixel in vacuum, hg1 is the 1-1st vertical distance from the substrate to the sub-pixel electrode of the 1-1st color sub-pixel, and hg2 is the 1-2nd vertical distance from the substrate to the sub-pixel electrode of the 1-2nd color sub-pixel.

14. The display device according to claim 12, wherein The second color sub-pixel includes the 2-1st color sub-pixel and the 2-2nd color sub-pixel that emit light of the same color and are adjacent to each other, and The 2-1st vertical distance from the substrate to the sub-pixel electrode of the 2-1st color sub-pixel is different from the 2-2nd vertical distance from the substrate to the sub-pixel electrode of the 2-2nd color sub-pixel.

15. The display device according to claim 12, wherein, the third color sub-pixel includes a 3-1 color sub-pixel and a 3-2 color sub-pixel that emit light of the same color and are adjacent to each other, and a 3-1 vertical distance from the substrate to a sub-pixel electrode of the 3-1 color sub-pixel is different from a 3-2 vertical distance from the substrate to a sub-pixel electrode of the 3-2 color sub-pixel.

16. The display device according to claim 14, wherein, a difference Δhb between the 2-1 vertical distance from the substrate to the sub-pixel electrode of the 2-1 color sub-pixel and the 2-2 vertical distance from the substrate to the sub-pixel electrode of the 2-2 color sub-pixel satisfies the following equation: where k is an integer, n0 is a refractive index of the organic encapsulation layer, λ2 is a wavelength of light reflected by the 2-1 color sub-pixel and the 2-2 color sub-pixel in a vacuum, hb1 is the 2-1 vertical distance from the substrate to the sub-pixel electrode of the 2-1 color sub-pixel, and hb2 is the 2-2 vertical distance from the substrate to the sub-pixel electrode of the 2-2 color sub-pixel.

17. The display device according to claim 15, wherein, a difference Δhr between the 3-1 vertical distance from the substrate to the sub-pixel electrode of the 3-1 color sub-pixel and the 3-2 vertical distance from the substrate to the sub-pixel electrode of the 3-2 color sub-pixel satisfies the following equation: where l is an integer, n0 is a refractive index of the organic encapsulation layer, λ3 is a wavelength of light reflected by the 3-1 color sub-pixel and the 3-2 color sub-pixel in a vacuum, hr1 is the 3-1 vertical distance from the substrate to the sub-pixel electrode of the 3-1 color sub-pixel, and hr2 is the 3-2 vertical distance from the substrate to the sub-pixel electrode of the 3-2 color sub-pixel.

18. The display device according to claim 1, wherein, The first color filter, the second color filter, and the third color filter overlap with each other in a region between the sub-pixel electrodes of the plurality of sub-pixels.

19. The display device according to claim 1 or 2, wherein, the first color sub-pixel has an elliptical shape in a plan view, and the first color sub-pixel includes a first-axis sub-pixel and a second-axis sub-pixel having elliptical axis angles different from each other.

20. The display device according to claim 1 or 2, wherein, each of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel has an elliptical shape in a plan view, and at least two of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel have different elliptic eccentricities from each other.

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