Display device

Abstract

The display apparatus includes a display panel, and the display panel includes: a light emitting device disposed in an emission area over a substrate and emitting light of a first wavelength; and a color filter disposed over the light emitting device, a transmittance of the color filter to light of the first wavelength being less than a transmittance of the color filter to light of the second wavelength, and the second wavelength being greater than the first wavelength, and a color filter disposed over the light emitting device, in an emission area over the substrate, of the display panel, 0.1579) is within the trajectory range of the MacAdams ellipse of about 10.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0104345 filed in the Korean Intellectual Property Office on August 9, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] One or more embodiments are directed to a display apparatus including a light emitting device and a color filter. Background Art

[0004] Typically, a light emitting device such as an organic light emitting diode and a thin film transistor is arranged on a substrate in a display device, and the display device operates by causing the light emitting device to emit light. Each pixel of the display device may include a light emitting device such as an organic light emitting diode, in which an intermediate layer including an emission layer is arranged between a pixel electrode and a counter electrode. The display device typically controls the light emission or light emission level of each pixel by a thin film transistor electrically connected to the pixel electrode. Some or more of the layers included in the light emitting device are commonly arranged in the light emitting device.

[0005] Recently, display devices have been used for various purposes. As display devices have been used in various fields, demands on image characteristics of display devices have also been diversified.

[0006] It should be understood that this background technology section is intended to provide useful background for understanding the technology in part. However, this background technology section may also include concepts, concepts or understandings known or understood by a person skilled in the relevant art before the corresponding effective application date that do not belong to the subject matter disclosed herein. Summary of the invention

[0007] One or more embodiments include a display device having improved image characteristics.

[0008] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosed embodiments.

[0009] According to one or more embodiments, a display device may include a display panel, and the display panel may include: a light-emitting device, which is arranged in an emission area above a substrate and includes a pixel electrode, an emission layer and a relative electrode; and a color filter, which is arranged above the light-emitting device, wherein the transmittance of the color filter to light of a first wavelength is less than the transmittance of the color filter to light of a second wavelength, and the transmittance of the color filter to light of the second wavelength is about 0.5 or less, the first wavelength is in a range of about 380nm to about 460nm, and the second wavelength is in a range of about 460nm to about 780nm, the wavelength-dependent transmittance curve of the color filter has a negative slope less than about 0 at a wavelength of about 460nm, the emission spectrum of the display panel in the emission area above the substrate has a Z value of the tristimulus values ​​in the range of about 0.82 to about 1, and the angle-dependent color variation of the display panel in the emission area above the substrate at the standard coordinates (0.1754, 0.1579) is within the range of a MacAdams ellipse of about 10 or less.

[0010] According to an embodiment, a peak wavelength of a wavelength-dependent transmittance graph of the color filter may be about 460 nm or less.

[0011] According to an embodiment, the emission layer may include a material that emits light of a first wavelength.

[0012] According to an embodiment, the pixel electrode may include a lower transparent electrode, a metal electrode disposed on the lower transparent electrode, and an upper transparent electrode, and the opposing electrode may include a metal layer.

[0013] According to an embodiment, the emission layer may include: a first emission layer; and a second emission layer disposed above the first emission layer and vertically spaced apart from the first emission layer, wherein the light emitting device may further include a first charge generation layer disposed between the first emission layer and the second emission layer.

[0014] According to an embodiment, the emission layer may further include a third emission layer disposed between the second emission layer and the opposite electrode, and the light emitting device may further include a second charge generation layer disposed between the second emission layer and the third emission layer.

[0015] According to an embodiment, the light emitting device may further include: a lower common layer, which is disposed on the lower surface of the emission layer and includes at least one of a hole transport layer and a hole injection layer; and an upper common layer, which is disposed on the upper surface of the emission layer and includes at least one of an electron transport layer and an electron injection layer.

[0016] According to an embodiment, the display apparatus may further include: a first inorganic encapsulation layer disposed on the light emitting device; an organic encapsulation layer disposed on the first inorganic encapsulation layer; and a second inorganic encapsulation layer disposed on the organic encapsulation layer.

[0017] According to an embodiment, the display device may further include: a touch sensor layer disposed on the second inorganic encapsulation layer, wherein the color filter may be disposed on the touch sensor layer.

[0018] According to an embodiment, the display device may further include: a light blocking pattern disposed above the touch sensor layer and including an upper opening exposing an upper surface of the touch sensor layer, wherein a color filter may be disposed on the exposed upper surface of the touch sensor layer and in the upper opening of the light blocking pattern.

[0019] According to an embodiment, the display device may further include: a cover window disposed on the color filter; and a window adhesive layer disposed between the color filter and the cover window, the window adhesive layer including an optically transparent adhesive.

[0020] According to an embodiment, the display device may further include: a pixel circuit layer disposed on the substrate, the pixel circuit layer including a thin film transistor, wherein the thin film transistor may include a semiconductor layer, a gate electrode, a source electrode and a drain electrode, and the pixel electrode may be electrically connected to the thin film transistor.

[0021] According to an embodiment, the display device may further include: a buffer layer disposed between the substrate and the thin film transistor; a gate insulating layer disposed between the semiconductor layer and the gate electrode; and an interlayer insulating layer disposed above the gate electrode, wherein the source electrode and the drain electrode may be disposed on the interlayer insulating layer.

[0022] According to one or more embodiments, a display device may include a display panel, and the display panel may include: a light-emitting device, which is arranged in an emission area above a substrate and emits light of a first wavelength; and a color filter, which is arranged above the light-emitting device, wherein the transmittance of the color filter to light of the first wavelength may be less than the transmittance of the color filter to light of a second wavelength, and the second wavelength may be greater than the first wavelength, and the angle-dependent color variation of the display panel in the emission area above the substrate at the standard coordinates (0.1754, 0.1579) may be within the trajectory range of a MacAdams ellipse of about 10.

[0023] According to an embodiment, the first wavelength may include a visible light wavelength of about 460 nm or less, and the second wavelength may include a visible light wavelength of about 460 nm or more.

[0024] According to an embodiment, a wavelength-dependent transmittance graph of the color filter may have a negative slope at a wavelength of about 460 nm, and a peak wavelength of the wavelength-dependent transmittance graph of the color filter may be about 460 nm or less.

[0025] According to an embodiment, a light emitting device may include a transparent pixel electrode, an emission layer disposed on the transparent pixel electrode, and a transparent opposite electrode.

[0026] According to an embodiment, an emission spectrum of the display panel in an emission region over the substrate may have a Z value of tristimulus values ​​in a range of about 0.8 to about 1.

[0027] According to an embodiment, an emission spectrum of a display panel in an emission region above a substrate may have a Z value of tristimulus values ​​in a range of about 0.82 to about 1, and a light-emitting device may include: a pixel electrode including a lower transparent electrode, a metal electrode disposed above the lower transparent electrode, and an upper transparent electrode; an emission layer disposed above the pixel electrode; and a relative electrode including a metal layer.

[0028] According to an embodiment, the display apparatus may further include: a thin film encapsulation layer disposed on the light emitting device and encapsulating the light emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other aspects, features and advantages of the embodiments will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0030] Figure 1 is a schematic plan view schematically showing a portion of a display device according to an embodiment;

[0031] Figure 2 is a schematic diagram of an equivalent circuit of a pixel according to an embodiment;

[0032] Figure 3 is a schematic diagram showing a method according to an embodiment of the present invention. Figure 1 A schematic diagram of a schematic cross-section of a display device in a display area of ​​a substrate corresponding to a schematic cross-section taken along line II';

[0033] Figure 4 is a schematic diagram schematically showing a schematic cross section of a display device according to an embodiment in a display region of a substrate;

[0034] Figure 5A is a schematic cross-sectional view showing a light emitting device according to an embodiment;

[0035] Figure 5B is a schematic cross-sectional view showing a light emitting device according to an embodiment;

[0036] Fig. 6A is a graph showing wavelength-dependent transmittance of a color filter according to an embodiment;

[0037] Figure 6B is a graph showing wavelength-dependent transmittance of a color filter according to an embodiment;

[0038] Fig. 7A is an emission spectrum showing the wavelength-dependent emission intensity of the display device according to Comparative Example 1A;

[0039] Figure 7B is an emission spectrum showing the wavelength-dependent emission intensity of the display device according to Comparative Example 1B;

[0040] Figure 7C is an emission spectrum showing the wavelength-dependent emission intensity of the display device according to Experimental Example 1;

[0041] Fig. 8A shows the color coordinate measurement results of the display device according to Comparative Example 1A;

[0042] Figure 8B shows the color coordinate measurement results of the display device according to Comparative Example 1B;

[0043] Figure 8C shows the color coordinate measurement result of the display device according to Experimental Example 1 of the present disclosure;

[0044] Fig.9A is a schematic diagram showing color coordinates of a display device according to Comparative Example 2A;

[0045] Fig. 9B is a schematic diagram showing color coordinates of a display device according to Comparative Example 2B;

[0046] Fig. 9C is a schematic diagram showing color coordinates of a display device according to Comparative Example 2C; and

[0047] Fig.9D is a schematic diagram showing color coordinates of a display device according to Experimental Example 2 of the present disclosure. DETAILED DESCRIPTION

[0048] Reference will now be made in detail to embodiments, examples of which are shown in the accompanying drawings, wherein the same reference numerals refer to the same elements throughout. In this regard, the embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Therefore, embodiments are described below with reference to the accompanying drawings to explain the described aspects.

[0049] In the specification and claims, for the purpose of its meaning and interpretation, the term "and / or" is intended to include any combination of the terms "and" and "or". For example, "A and / or B" may be understood to mean "A, B, or A and B". The terms "and" and "or" may be used in a conjunction or disjunction sense and may be understood to be equivalent to "and / or".

[0050] Throughout the disclosure, the expression "at least one of a, b, and c" refers to only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0051] The present disclosure may include various embodiments and modifications, and its embodiments are shown in the drawings and will be described in detail herein. From the embodiments described in detail below with reference to the drawings, the effects and features of the present disclosure and methods for implementing the same will become apparent. However, the present disclosure is not limited to the embodiments described below and may be implemented in various modes.

[0052] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, and in the following description, the same reference numerals will denote the same elements and redundant descriptions thereof will be omitted for the sake of brevity.

[0053] It will be understood that although terms such as "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms, and these terms are only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0054] As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0055] It will be understood that when used in this specification, terms such as “comprises,” “including,” “includes,” and / or “comprising,” “having,” “having” and / or “having” and variations thereof specify the presence of stated features, integers, steps, operations, elements, parts and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups thereof.

[0056] It will be understood that when a layer, region, area, component or element is referred to as being “on” another layer, region, area, component or element, it can be “directly on” another layer, region, area, component or element, or can be “indirectly on” another layer, region, area, component or element with one or more intervening layers, regions, areas, components or elements interposed therebetween.

[0057] The term "overlapping" or "overlapping with..." means that the first object can be above or below the second object or on one side of the second object, and vice versa. In addition, the term "overlapping" may include stacking, stacking, facing or facing, extending over, covering or partially covering, or any other suitable term as will be appreciated and understood by those of ordinary skill in the art.

[0058] When an element is described as “not “overlapping” or “not overlapping” another element, this may include the elements being spaced apart, offset or separated from each other, or any other suitable terminology as would be appreciated and understood by one of ordinary skill in the art.

[0059] The terms "facing" and "facing" mean that the first element can be directly or indirectly opposite to the second element. In the case where a third element is interposed between the first element and the second element, the first element and the second element can be understood to be indirectly opposite to each other, but still facing each other.

[0060] For the convenience of description, the size of the elements in the drawings may be exaggerated. In other words, since the size and shape of the components in the drawings are arbitrarily shown for the convenience of description, the present disclosure is not limited thereto.

[0061] When the embodiments can be implemented differently, a specific process order may be performed differently from the described order. For example, two processes described successively may be performed substantially simultaneously, or may be performed in an order opposite to the described order.

[0062] It will be understood that when a layer, region, or component is referred to as being “connected to” another layer, region, or component, it may be “directly connected to” the other layer, region, or component, or may be “indirectly connected to” the other layer, region, or component with one or more intervening layers, regions, or components interposed. For example, it will be understood that when a layer, region, area, component, or element is referred to as being “electrically connected to” another layer, region, area, component, or element, it may be “directly electrically connected to” the other layer, region, area, component, or element, or may be “indirectly electrically connected to” the other layer, region, area, component, or element with one or more intervening layers, regions, areas, components, or elements interposed.

[0063] Throughout the disclosure, like reference numerals may refer to like elements. Hereinafter, a display device according to an embodiment will be described.

[0064] As used herein, "about" or "approximately" is inclusive of the stated value and means within an acceptable range of deviation of the particular value as determined by one of ordinary skill in the art, in view of the measurements in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0065] Unless otherwise defined or indicated herein, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. It will also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless explicitly so defined herein.

[0066] Figure 1 is a schematic plan view schematically showing a part of a display device according to an embodiment. Figure 2 is a schematic diagram of an equivalent circuit of a pixel according to an embodiment.

[0067] refer to Figure 1 and Figure 2 , the substrate 100 of the display device 1 according to the embodiment may include a display area DA and a peripheral area PA. The peripheral area PA may be arranged (or disposed) outside the display area DA to surround the display area DA or be adjacent to the display area DA. A driving circuit unit and various lines for transmitting an electrical signal to be transmitted to the display area DA may be located (or disposed) in the peripheral area PA. The display device 1 may provide an image by using light emitted from pixels P arranged in the display area DA. Each of the pixels P of the display area DA may emit red light, green light, blue light, or white light.

[0068] Each of the pixels P may include a light emitting device ED. For example, the light emitting device ED may emit red light, green light, or blue light, or may emit red light, green light, blue light, or white light. The light emitting device ED may include an organic light emitting diode (OLED) or an inorganic light emitting diode. The light emitting device ED may be connected to the pixel circuit PC, such as Figure 2 As shown in . The pixel circuit PC may include a first thin film transistor Tr1 and a second thin film transistor Tr2 and a storage capacitor Cst. The pixel circuit PC may be connected to a scan line SL, a data line DL, and a driving voltage line PL. In an embodiment, the scan line SL may be as shown in FIG. Figure 1 , the data line DL and the driving voltage line PL may extend in the first direction D1. The first direction D1 may be parallel to the upper surface of the substrate 100. The second direction D2 may intersect with the first direction D1. The third direction D3 may intersect with the first direction D1 and the second direction D2. For example, the first direction D1 may be an x-axis direction, the second direction D2 may be a y-axis direction, and the third direction D3 may be a z-axis direction; however, the present disclosure is not limited thereto.

[0069] Each of the pixels P may emit light according to driving of the pixel circuit PC, and the display area DA may provide an image by the light emitted from the pixel P. As described above, herein, the pixel P may be defined as an emission area emitting any one of red, green, blue, and white light.

[0070] The peripheral area PA may be an area where pixels P are not arranged and may not provide an image. A printed circuit board including an internal driving circuit unit, a power supply line, and a driving circuit unit for driving pixels P or a terminal unit connected to a driver IC may be arranged in the peripheral area PA.

[0071] like Figure 2 As shown in , the light emitting device ED is connected to a pixel circuit PC in each of the pixels P. The pixel circuit PC may include a first thin film transistor Tr1, a second thin film transistor Tr2, and a storage capacitor Cst.

[0072] The second thin film transistor Tr2 may be a switching thin film transistor and may be connected to the scan line SL and the data line DL. The second thin film transistor Tr2 may transfer a data voltage input from the data line DL to the first thin film transistor Tr1 according to a switching voltage input from the scan line SL.

[0073] The storage capacitor Cst may be connected to the second thin film transistor Tr2 and the driving voltage line PL. The storage capacitor Cst may store a voltage corresponding to a difference between a voltage received from the second thin film transistor Tr2 and a first power source voltage ELVDD supplied to the driving voltage line PL.

[0074] The first thin film transistor Tr1 may be a driving thin film transistor and may be connected to the driving voltage line PL and the storage capacitor Cst. The first thin film transistor Tr1 may control a driving current flowing from the driving voltage line PL through the light emitting device ED in response to a voltage value stored in the storage capacitor Cst. The light emitting device ED may emit light with brightness according to the driving current. An opposite electrode (e.g., a cathode) of the light emitting device ED may be provided with a second power supply voltage ELVSS.

[0075] Figure 2 It is shown that the pixel circuit PC may include two thin film transistors Tr1 and Tr2 and one storage capacitor Cst; however, in other embodiments, the pixel circuit PC may include three or more transistors.

[0076] Figure 3 is a schematic diagram showing a method according to an embodiment of the present invention. Figure 1 A schematic diagram of a schematic cross-section of a display device in a display area of ​​a substrate corresponding to a schematic cross-section taken along line II'.

[0077] refer to Figure 3 , the display device 1 may include a display panel 10. The display panel 10 may include a display area DA of a substrate 100, a pixel circuit layer 110 over the display area DA of the substrate 100, a light emitting device ED, an encapsulation layer TFE, a touch sensor layer 400, a color filter CF, a light blocking pattern 450, and a cover window 500.

[0078] The substrate 100 may include a glass material or a polymer resin. For example, the substrate 100 may include a silicon oxide (SiO x ) as a glass material as a main component, or may include a polymer resin such as polyethersulfone, polyarylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyimide, polycarbonate, cellulose triacetate and / or cellulose acetate propionate.

[0079] The pixel circuit layer 110 may be disposed on the substrate 100. The pixel circuit layer 110 may include a pixel circuit PC (see Figure 2 ) and an insulating layer. For example, the pixel circuit layer 110 may include a thin film transistor TFT, a storage capacitor Cst (see Figure 2 ), a buffer layer 111, a gate insulating layer 112, an interlayer insulating layer 113, a protective layer 114 and a planarizing insulating layer 115.

[0080] The thin film transistor TFT may include a semiconductor layer ACT, a gate electrode GE, a source electrode SE, and a drain electrode DE. The semiconductor layer ACT may include amorphous silicon, polycrystalline silicon, or an organic semiconductor material. A gate insulating layer 112 may be arranged between the semiconductor layer ACT and the gate electrode GE. The gate insulating layer 112 may ensure insulation between the semiconductor layer ACT and the gate electrode GE. The semiconductor layer ACT may include a channel region and impurity regions arranged on both sides of the channel region. One of the impurity regions arranged on both sides of the channel region may correspond to a source region, and the other may correspond to a drain region. The gate insulating layer 112 may include a material such as silicon oxide (SiO x ), silicon nitride (SiN x The gate insulating layer 112 may be formed by chemical vapor deposition (CVD) or atomic layer deposition (ALD).

[0081] The interlayer insulating layer 113 may be disposed on the gate electrode GE. The interlayer insulating layer 113 may include silicon oxide (SiO x ), silicon nitride (SiN x ) and / or inorganic materials of silicon oxynitride (SiON).

[0082] The source electrode SE and the drain electrode DE may be disposed on the interlayer insulating layer 113. In an embodiment, any one of the source electrode SE and the drain electrode DE may be omitted and replaced with a conductive semiconductor layer ACT.

[0083] The gate electrode GE, the source electrode SE, and the drain electrode DE may be formed of various conductive materials. The gate electrode GE may include at least one of molybdenum (Mo), aluminum (Al), copper (Cu), and titanium (Ti). For example, the gate electrode GE may include a single layer of molybdenum (Mo). In contrast, the gate electrode GE may include a three-layer structure including a molybdenum layer, an aluminum layer, and a molybdenum layer. Each of the source electrode SE and the drain electrode DE may include at least one of copper (Cu), titanium (Ti), and aluminum (Al). Each of the source electrode SE and the drain electrode DE may include a single layer or multiple layers. For example, each of the source electrode SE and the drain electrode DE may include a three-layer structure including a titanium layer, an aluminum layer, and a titanium layer.

[0084] The protective layer 114 may be disposed on the interlayer insulating layer 113 to cover the interlayer insulating layer 113 , the source electrode SE, and the drain electrode DE. The protective layer 114 may prevent a metal line (not shown) from being exposed to an etching environment during a manufacturing process of the display device 1 .

[0085] The buffer layer 111 may be disposed between the thin film transistor TFT and the substrate 100. The buffer layer 111 may include silicon oxide (SiO x ), silicon nitride (SiN x ) and / or an inorganic material of silicon oxynitride (SiON). The buffer layer 111 may increase the smoothness of the upper surface of the substrate 100, or may prevent impurities from penetrating from the substrate 100 into the semiconductor layer ACT of the thin film transistor TFT.

[0086] The planarization insulating layer 115 may be disposed on the protective layer 114. The planarization insulating layer 115 may be formed of, for example, an organic material such as acryl, benzocyclobutene (BCB), or hexamethyldisiloxane (HMDSO). Figure 3 , the planarization insulating layer 115 is illustrated as including a single layer; however, the planarization insulating layer 115 may include a plurality of layers.

[0087] The light emitting device ED may include a pixel electrode 210, an emission layer 220, and an opposing electrode 230. The pixel electrode 210 may be disposed on the planarization insulating layer 115. The pixel electrode 210 may be connected to any one of the source electrode SE and the drain electrode DE corresponding thereto by passing through the planarization insulating layer 115. Therefore, the pixel electrode 210 may be electrically connected to the thin film transistor TFT. The pixel electrode 210 may be an anode.

[0088] The pixel electrode 210 may include a lower transparent electrode 211, a metal electrode 213, and an upper transparent electrode 212. The lower transparent electrode 211 may include a transparent conductive oxide. The transparent conductive oxide may include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In 2 O 3 ), at least one of indium gallium oxide (IGO) and aluminum zinc oxide (AZO). The metal electrode 213 may be disposed on the lower transparent electrode 211. The metal electrode 213 may include Ag or an Ag alloy. As another example, the metal electrode 213 may include Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr or any compound thereof. The upper transparent electrode 212 may be arranged on the upper surface of the metal electrode 213. The upper transparent electrode 212 may include a transparent conductive oxide, and the transparent conductive oxide may include any of the materials described above in the example of the lower transparent electrode 211. As an example, the pixel electrode 210 may include a stack of ITO / Ag / ITO.

[0089] The light emitting device ED may be arranged in each pixel P (see Figure 1 ). The light emitting device ED may emit light of a first wavelength. The light of the first wavelength may be blue light. For example, the first wavelength may be in the range of about 380 nm to about 460 nm. The light emitting device ED may also emit a portion of light of a second wavelength. The second wavelength may be in the range of about 460 nm to about 780 nm. The light of the second wavelength may be green light or red light.

[0090] The display device 1 may further include a pixel defining layer 120. The pixel defining layer 120 may be disposed on the pixel electrode 210. The pixel defining layer 120 may include an emission opening 1220. The emission opening 1220 may expose the upper surface of the pixel electrode 210 by passing through the pixel defining layer 120. The upper surface of the pixel electrode 210 may correspond to the upper surface of the upper transparent electrode 212. The emission opening 1220 may define the pixel P (see Figure 1 ) of the emission area EA. As described above, light of the first wavelength may be emitted from the light emitting device ED of the emission area EA. The emission area EA may be a blue emission area, and the light emitting device ED may be a blue light emitting device.

[0091] The pixel defining layer 120 may cover the edge of the pixel electrode 210 to increase the distance between the edge of the pixel electrode 210 and the opposite electrode 230 , thereby preventing an arc from occurring at the edge of the pixel electrode 210 .

[0092] The pixel defining layer 120 may include an organic insulating material such as polyimide, polyamide, acrylic resin, benzocyclobutene, HMDSO or phenolic resin. For example, the pixel defining layer 120 may include an inorganic insulating material. For example, the pixel defining layer 120 may have a multilayer structure including an inorganic insulating material and an organic insulating material. The pixel defining layer 120 may be formed by a method such as spin coating.

[0093] In an embodiment, the pixel defining layer 120 may include a black matrix. For example, the pixel defining layer 120 may include a light blocking material and may be set to black. The light blocking material may include, for example, a resin or paste containing carbon black, carbon nanotubes and / or a black dye, metal particles (e.g., nickel, aluminum, molybdenum or any alloy thereof), metal oxide particles (e.g., chromium oxide), or metal nitride particles (e.g., chromium nitride).

[0094] The emission layer 220 may be disposed above the pixel electrode 210. The emission layers 220 may be laterally spaced apart from each other. The emission layer 220 may emit light of a first wavelength. The fact that the light emitting device ED emits light may mean that the light is emitted from the emission layer 220. The emission layer 220 may include an organic light emitting material; however, the present disclosure is not limited thereto. As an example, the emission layer 220 may include a fluorescent material or a phosphorescent material. The light emitted from the emission layer 220 may have a peak wavelength of less than about 460 nm. For example, the light emitted from the emission layer 220 may have a peak wavelength within a first wavelength range.

[0095] The opposing electrode 230 may be disposed on the emission layer 220. The opposing electrode 230 may also extend to the inner wall of the emission opening 1220 and the upper surface of the pixel defining layer 120. The opposing electrode 230 may be a common electrode. For example, the opposing electrode 230 may be integrally formed to completely cover the substrate 100, for example, to completely cover the display area DA of the substrate 100 (see Figure 1 )'s public layer.

[0096] The opposite electrode 230 may be a cathode as an electron injection electrode. A metal, alloy, conductive compound or any combination thereof with a low work function may be used as a material of the opposite electrode 230. The opposite electrode 230 may include a reflective electrode. The opposite electrode 230 may include, for example, lithium (Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum lithium (Al-Li), calcium (Ca), magnesium indium (Mg-In), magnesium silver (Mg-Ag), ytterbium (Yb), silver ytterbium (Ag-Yb), ITO, IZO or any combination thereof. The opposite electrode 230 may have a single-layer structure including a single layer or a multilayer structure including a plurality of layers.

[0097] The light emitting device ED may further include at least one of a lower common layer (not shown) and an upper common layer (not shown). The lower common layer may be arranged on the lower surface of the emission layer 220. For example, the lower common layer may include at least one of a hole transport layer (HTL) and a hole injection layer (HIL). The upper common layer may be arranged on the upper surface of the emission layer 220. The upper common layer may include at least one of an electron transport layer (ETL) and an electron injection layer (EIL). Each of the lower common layer and the upper common layer may be integrally formed to completely cover the entire substrate 100, for example, to completely cover the display area DA of the substrate 100 (see Figure 1 )'s common layer, like the above-mentioned relative electrode 230.

[0098] The encapsulation layer TFE may be disposed on the light-emitting device ED and the pixel defining layer 120 to encapsulate the light-emitting device ED. The encapsulation layer TFE may be a thin film encapsulation layer. The encapsulation layer TFE may include a first inorganic encapsulation layer 310, a second inorganic encapsulation layer 320, and an organic encapsulation layer 330. The first inorganic encapsulation layer 310 may be disposed on the light-emitting device ED to cover the light-emitting device ED. The first inorganic encapsulation layer 310 may include an inorganic insulating material. The inorganic insulating material may include aluminum oxide, titanium oxide, tantalum oxide, hafnium oxide, zinc oxide, silicon oxide, silicon nitride, and / or silicon oxynitride. The first inorganic encapsulation layer 310 may be formed by a CVD process. The first inorganic encapsulation layer 310 may be transparent.

[0099] The organic encapsulation layer 330 may be arranged on the upper surface of the first inorganic encapsulation layer 310 to cover the upper surface of the first inorganic encapsulation layer 310. The organic encapsulation layer 330 may include a polymer. Within the spirit and scope of the present disclosure, the polymer may include an acryl-based resin, an epoxy-based resin, a polyimide, polyethylene, and / or the like. For example, the organic encapsulation layer 330 may include an acryl-based resin such as polymethyl methacrylate or polyacrylic acid. The organic encapsulation layer 330 may be formed by curing a monomer or coating a polymer. The organic encapsulation layer 330 may cover the uneven portion of the light-emitting device ED, and therefore, the upper surface of the organic encapsulation layer 330 may be flatter than the upper surface of the first inorganic encapsulation layer 310. The organic encapsulation layer 330 may be transparent.

[0100] The second inorganic encapsulating layer 320 may be disposed on the upper surface of the organic encapsulating layer 330. The second inorganic encapsulating layer 320 may include the inorganic insulating material described above in the example of the first inorganic encapsulating layer 310. The second inorganic encapsulating layer 320 may be formed by a CVD process. The second inorganic encapsulating layer 320 may be transparent.

[0101] The display device 1 may further include a touch sensor layer 400. The touch sensor layer 400 may be disposed on the encapsulation layer TFE. The touch sensor layer 400 may sense a user's touch input. The touch sensor layer 400 may sense a user's touch input by a resistance method or a capacitance method. The touch sensor layer 400 may include a stacked insulating layer and a conductive layer. The conductive layer may be arranged between the insulating layers and may be used as a touch electrode. Unlike the illustration, the touch sensor layer 400 may be omitted.

[0102] The light blocking pattern 450 may be disposed above the touch sensor layer 400. The light blocking pattern 450 may absorb or reflect light. The light blocking pattern 450 may include an upper opening 459. The upper opening 459 may expose the upper surface of the touch sensor layer 400 by passing through the light blocking pattern 450. The upper opening 459 may vertically overlap with the emission opening 1220. The light blocking pattern 450 may include an upper opening 459 and may have a substantially grid shape in a plan view. The light blocking pattern 450 may include an insulating material (e.g., an organic insulating material) and a light blocking material. The light blocking material may include a black pigment or a black dye. The light blocking pattern 450 may include, for example, a black matrix. The light blocking pattern 450 may be arranged corresponding to the non-emitting area and may prevent the pixel P (see Figure 1 ) between the light leakage. The non-emitting area may be an area that does not vertically overlap with the emission opening 1220. The light blocking pattern 450 may vertically overlap with the pixel defining layer 120. As described above, in the case where the pixel defining layer 120 may include a light blocking material, the light blocking function of the pixel defining layer 120 and the light blocking pattern 450 may be maximized.

[0103] The color filter CF may be disposed on the upper surface of the touch sensor layer 400 and in the upper opening 459 of the light blocking pattern 450. The color filter CF may transmit only light of a given wavelength and may filter out light of other wavelengths.

[0104] The color filter CF may be disposed above the light emitting device ED. For example, the color filter CF may vertically overlap with the emission opening 1220. The color filter CF may be a color filter that transmits light of a first wavelength. Therefore, the light emitting device ED may emit light of a first wavelength, and the color filter CF may transmit the light of the first wavelength emitted from the light emitting device ED. For example, the color filter CF may be a blue color filter.

[0105] According to an embodiment, the color filter CF may include a material having different transmittances according to wavelengths. The color filter CF may have a structure having different absorptivity according to wavelengths. The color filter CF may have a high transmittance to light of a first wavelength and a low transmittance to light of a second wavelength. The first wavelength may be about 460nm or less. For example, the first wavelength may be a visible light wavelength of about 460nm or less. For example, the first wavelength may be in the range of about 380nm to about 460nm. The second wavelength may be greater than the first wavelength. The second wavelength may be greater than about 460nm. For example, the second wavelength may be in the range of about 460nm to about 780nm. The transmittance of the color filter CF to light of the first wavelength may be greater than the transmittance of the color filter CF to light of the second wavelength. The transmittance of the color filter CF to light of the second wavelength may be 0.5 or less.

[0106] The cover window 500 may be disposed on the color filter CF. The cover window 500 may be transparent. The cover window 500 may include at least one of glass, sapphire, and plastic. The cover window 500 may include, for example, ultra-thin glass (UTG) or colorless polyimide (CPI).

[0107] The display device 1 may further include a window adhesive layer OCA. The window adhesive layer OCA may be arranged between the color filter CF and the cover window 500. The cover window 500 may be attached to the color filter CF through the window adhesive layer OCA. The window adhesive layer OCA may include an optically transparent adhesive. The optically transparent adhesive may include an organic material such as a polymer.

[0108] According to an embodiment, the light-emitting device ED may be a front light-emitting device. The emission spectrum of the display panel 10 in the emission area EA may have a Z of about 0.82 to about 1. According to an embodiment, by adjusting the wavelength-dependent transmittance of the color filter CF or the light-emitting material of the emission layer 220, the Z of the emission spectrum of the display panel 10 may satisfy the above condition range. CIE XYZ may be a universal color space representing a color spectrum that humans can see. The CIE tristimulus values ​​may include X, Y, and Z, where X may be assigned to a red curve, Y may be assigned to a green curve, and Z may be assigned to a blue curve. As the Z of the emission spectrum approaches 1, a purer blue may exist. According to an embodiment, the display device 1 may emit a large amount of pure blue wavelength light in the blue emission region, and therefore may have improved image characteristics.

[0109] The angle-dependent color variation of the display panel 10 at the standard coordinates (0.1754, 0.1579) in the emission area EA may be within a MacAdams ellipse range of about 10. The standard coordinates (0.1754, 0.1579) may correspond to the standard coordinates of blue. The MacAdams ellipse may be an area of ​​the chromaticity diagram that may include all colors that are indistinguishable from the color at the center of the ellipse for an average human eye. A MacAdams ellipse range of about 10 or less may mean that it is difficult for humans to recognize the color difference between two given colors. According to an embodiment, because the angle-dependent color variation at the standard coordinates (0.1754, 0.1579) is within a MacAdams ellipse range of about 10 or less, it may be difficult for a user to recognize the color difference relative to the blue light emitted from the display panel 10 in the emission area EA. The user can equally recognize the colors seen from the front surface and the side surface of the display device 1. Therefore, the image characteristics of the display device 1 can be improved.

[0110] Figure 4 is a schematic diagram showing a method according to an embodiment of the present invention. Figure 1 A schematic diagram of a schematic cross section of a display device in a display region of a substrate corresponding to a schematic cross section taken along line II'. In the following, descriptions that are redundant with those given above will be omitted for the sake of brevity.

[0111] refer to Figure 4 The display device 1 may include a display panel 10 , and the display panel 10 may include a substrate 100 , a pixel circuit layer 110 , a light emitting device ED, an encapsulation layer TFE, a touch sensor layer 400 , a color filter CF, a light blocking pattern 450 , and a cover window 500 .

[0112] The light emitting device ED may include a pixel electrode 210', an emission layer 220, and an opposing electrode 230'. The pixel electrode 210', the emission layer 220, and the opposing electrode 230' may be substantially the same as described above. Figure 3 The pixel electrode 210' may be the same as those described in the example of FIG. However, the pixel electrode 210' may be a transparent pixel electrode. The pixel electrode 210' may include a transparent conductive oxide. The transparent conductive oxide may include the above Figure 3 The material described in the example of the lower transparent electrode 211 of the pixel electrode 210'. The pixel electrode 210' may include a single transparent conductive oxide layer or multiple transparent conductive oxide layers. The pixel electrode 210' may not include a metal layer, a metal electrode or a reflective electrode. As an example, the emission layer 220 may be directly disposed on the pixel electrode 210' and may contact the pixel electrode 210'.

[0113] The opposing electrode 230' may be a transparent opposing electrode. The opposing electrode 230' may include a transparent conductive oxide. The transparent conductive oxide may include the above Figure 3 The material described in the example of the lower transparent electrode 211 of the embodiment. The opposite electrode 230' may include a single transparent conductive oxide layer or a plurality of transparent conductive oxide layers. The opposite electrode 230' may not include a metal layer, a metal electrode or a reflective electrode. As an example, the opposite electrode 230' may be directly disposed on the emission layer 220 and may contact the emission layer 220.

[0114] According to an embodiment, the display device 1 may include a back light emitting device. The emission spectrum of the display panel 10 in the emission area EA may have a Z of about 0.8 to about 1. According to an embodiment, the display device 1 may emit a large amount of pure blue wavelength light in the blue emission area, and thus may have improved image characteristics.

[0115] like Figure 3 and Figure 4 As described in the above, the light emitting device ED may include an emission layer 220. However, the present disclosure is not limited thereto. Figure 5A and Figure 5B As shown in , the emission layer 220 of the light emitting device ED may have a tandem structure in which layers are stacked on each other.

[0116] Figure 5A is a schematic cross-sectional view showing a light emitting device according to an embodiment. Hereinafter, for the sake of brevity, descriptions redundant with those given above will be omitted.

[0117] refer to Figure 5A , the light emitting device ED may be an organic light emitting diode. The light emitting device ED may include a pixel electrode 210, an emission layer 220, a first charge generation layer CGL1, and an opposing electrode 230. The emission layer 220 may include a first emission layer 221 and a second emission layer 222. The first emission layer 221 may emit light of a first wavelength. The first emission layer 221 may be a blue emission layer.

[0118] The second emission layer 222 may be disposed on the first emission layer 221 and may be vertically spaced apart from the first emission layer 221. The second emission layer 222 may emit light of a first wavelength. The second emission layer 222 may be a blue emission layer. Different from this, the second emission layer 222 may emit light of a second wavelength. The second emission layer 222 may be a yellow emission layer, a red emission layer, or a green emission layer.

[0119] The first charge generation layer CGL1 may be disposed between the first emission layer 221 and the second emission layer 222. The first charge generation layer CGL1 may adjust the charge between the first emission layer 221 and the second emission layer 222 to achieve charge balance. The first charge generation layer CGL1 may include an n-type layer and a p-type layer stacked on each other. The n-type layer may be disposed adjacent to the first emission layer 221 and may provide electrons to the first emission layer 221. The p-type layer may be disposed adjacent to the second emission layer 222 and may provide holes to the second emission layer 222.

[0120] The opposite electrode 230 may be disposed on an upper surface of the second emission layer 222 .

[0121] The light emitting device ED may further include at least one of a first lower common layer 241 and a first upper common layer 251. The first lower common layer 241 may be disposed between the pixel electrode 210 and the first emission layer 221, and may include a first hole injection layer and / or a first hole transport layer. The first upper common layer 251 may be disposed between the first emission layer 221 and the first charge generation layer CGL1, and may include a first electron injection layer and / or a first electron transport layer.

[0122] The light emitting device ED may further include at least one of a second lower common layer 242 and a second upper common layer 252. The second lower common layer 242 may be disposed between the first charge generation layer CGL1 and the second emission layer 222, and may include a second hole injection layer and / or a second hole transport layer. The second upper common layer 252 may be disposed between the second emission layer 222 and the opposite electrode 230, and may include a second electron injection layer and / or a second electron transport layer.

[0123] Figure 5B is a schematic cross-sectional view showing a light emitting device according to an embodiment. Hereinafter, for the sake of brevity, descriptions redundant with those given above will be omitted.

[0124] refer to Figure 5B , the light emitting device ED may be an organic light emitting diode. The light emitting device ED may include a pixel electrode 210, an emission layer 220, a first charge generation layer CGL1, a second charge generation layer CGL2, and an opposing electrode 230. The emission layer 220 may include a first emission layer 221, a second emission layer 222, and a third emission layer 223. The first emission layer 221 may emit light of a first wavelength. The first emission layer 221 may be a blue emission layer.

[0125] The second emission layer 222 may be arranged between the first emission layer 221 and the opposite electrode 230, and may be vertically spaced apart from the first emission layer 221. The second emission layer 222 may emit light of a first wavelength. The second emission layer 222 may be a blue emission layer. Different from this, the second emission layer 222 may emit light of a second wavelength. The second emission layer 222 may be a yellow emission layer. Different from this, the second emission layer 222 may be a red emission layer or a green emission layer. As another example, the second emission layer 222 may include a red emission layer, a yellow emission layer, and a green emission layer stacked on each other.

[0126] The third emission layer 223 may be disposed between the second emission layer 222 and the opposite electrode 230. The third emission layer 223 may emit light of the first wavelength. The third emission layer 223 may be a blue emission layer.

[0127] The first charge generation layer CGL1 may be disposed between the first emission layer 221 and the second emission layer 222. The first charge generation layer CGL1 may be substantially the same as that described above with reference to FIG. Figure 5A Same as described.

[0128] The second charge generation layer CGL2 may be disposed between the second emission layer 222 and the third emission layer 223. The second charge generation layer CGL2 may adjust the charge between the second emission layer 222 and the third emission layer 223 to achieve charge balance. The second charge generation layer CGL2 may include an n-type layer and a p-type layer stacked on each other. The n-type layer may be disposed adjacent to the second emission layer 222 and may provide electrons to the second emission layer 222. The p-type layer may be disposed adjacent to the third emission layer 223 and may provide holes to the third emission layer 223.

[0129] The light emitting device ED may further include at least one of a first lower common layer 241, a first upper common layer 251, a second lower common layer 242, and a second upper common layer 252. The second upper common layer 252 may be disposed between the second emission layer 222 and the second charge generation layer CGL2.

[0130] The light emitting device ED may further include at least one of a third lower common layer 243 and a third upper common layer 253. The third lower common layer 243 may be disposed between the second charge generation layer CGL2 and the third emission layer 223, and may include a third hole injection layer and / or a third hole transport layer. The third upper common layer 253 may be disposed between the third emission layer 223 and the opposite electrode 230, and may include a third electron injection layer and / or a third electron transport layer.

[0131] According to an embodiment, the light emitting device ED may have Figure 5A or Figure 5B The tandem structure shown in , and thus can have high brightness and long life.

[0132] Fig. 6A is a graph showing wavelength-dependent transmittance of a color filter according to an embodiment. Figure 6B is a graph showing wavelength-dependent transmittance of a color filter according to an embodiment.

[0133] refer to Fig. 6A and Figure 6B , the color filter may have a transmittance of about 0.5 or less at a second wavelength greater than about 460 nm. The transmittance of the color filter to light of the first wavelength may be greater than the transmittance of the color filter to light of the second wavelength. The first wavelength may be in the range of about 380 nm to about 460 nm.

[0134] refer to Figure 6B , the wavelength-dependent transmittance curve of the color filter may have a negative slope less than about 0 at a wavelength of about 460 nm. The slope may be given by Figure 6B The peak wavelength of the wavelength-dependent transmittance curve may correspond to the first wavelength. For example, the peak wavelength of the wavelength-dependent transmittance curve may be less than about 460 nm.

[0135]

Based on the measurement of emission spectrum and color coordinates of luminescent materials

[0136] Comparative Example 1A

[0137] A display device including an emission layer including a light-emitting material according to the related art is prepared, and an emission spectrum and color coordinates of the display device are measured.

[0138] Comparative Example 1B

[0139] A display device including an emission layer containing a luminescent material according to the related art was prepared. The color coordinates of the display device were measured. The luminescent material of Comparative Example 1B was different from the luminescent material of Comparative Example 1A. The emission spectrum and color coordinates of the display device according to Comparative Example 1B were measured in the same manner as in Comparative Example 1A.

[0140] Experimental Example 1

[0141] A display device including an emission layer including a light emitting material was prepared according to Experimental Example 1. An emission spectrum and color coordinates of the display device according to Experimental Example 1 were measured in the same manner as in Comparative Example 1A.

[0142] Fig. 7A is an emission spectrum showing the wavelength-dependent emission intensity of the display device according to Comparative Example 1A. Figure 7B is an emission spectrum showing the wavelength-dependent emission intensity of the display device according to Comparative Example 1B. Figure 7Cis an emission spectrum showing the wavelength-dependent emission intensity of the display device according to Experimental Example 1.

[0143] refer to Fig. 7A , Figure 7B and Figure 7C ,and Fig. 7A The emission spectrum of the display device of Comparative Example 1A and Figure 7B Compared with the emission spectrum of the display device of Comparative Example 1B, the emission spectrum of the display device of Experimental Example 1 may be shifted to the left. For example, the wavelength range of the peak wavelength of the emission spectrum of the display device of Experimental Example 1 may be smaller than the wavelength range of the peak wavelength of the emission spectrum of the display device of Comparative Example 1A. The wavelength range of the peak wavelength of the emission spectrum of the display device of Experimental Example 1 may be smaller than the wavelength range of the peak wavelength of the emission spectrum of the display device of Comparative Example 1B.

[0144] Table 1 shows the results of analyzing tristimulus values ​​of emission spectra from the display device of Comparative Example 1A, the display device of Comparative Example 1B, and the display device of Experimental Example 1. The display device of Comparative Example 1A, the display device of Comparative Example 1B, and the display device of Experimental Example 1 used in the analysis of Table 1 may be a back-light emitting device.

[0145]

Table 1

[0146] Tristimulus values ​​of emission spectra Comparative Example 1A Comparative Example 1B Experimental Example 1 X 13.5％ 14.2％ 14.4％ Y 6.5％ 5.0％ 4.5％ Z 80.0％ 80.8％ 81.8％

[0147] Refer to Table 1 and Fig. 7A , Figure 7B and Figure 7C , in the case of Experimental Example 1, the emission spectrum of the display panel in the emission area may have a Z of 0.8 or more.

[0148] Fig. 8A The color coordinate measurement results of the display device according to Comparative Example 1A are shown. Figure 8B The color coordinate measurement results of the display device according to Comparative Example 1B are shown. Figure 8C Graphs 1 and 2 show the color coordinate measurement results of the display device according to Experimental Example 1 of the present disclosure. Fig. 8A , Figure 8B and Figure 8C In FIG. 1 , the dashed line may represent the desired trajectory. The desired trajectory may be located within an ellipse as the MacAdams ellipse 10. Fig. 8A , Figure 8B and Figure 8C In FIG. 1 , 0°, 15°, 30°, 45°, and 60° may refer to viewing angles.

[0149] refer to Fig. 8A, the angle-dependent color change of the display panel of the display device of Comparative Example 1A at the standard coordinates (0.1754, 0.1579) may deviate from the desired trajectory. For example, the angle-dependent color change of the display panel of the display device of Comparative Example 1A at the standard coordinates (0.1754, 0.1579) may deviate from the range of MacAdams ellipse 10.

[0150] refer to Figure 8B , the angle-dependent color change of the display panel of the display device of Comparative Example 1B at the standard coordinates (0.1754, 0.1579) may deviate from the desired trajectory. For example, the angle-dependent color change of the display panel of the display device of Comparative Example 1B at the standard coordinates (0.1754, 0.1579) may deviate from the range of MacAdams ellipse 10.

[0151] refer to Figure 8C , the angle-dependent color change of the display panel of the display device of Experimental Example 1 at the standard coordinates (0.1754, 0.1579) can be located within the desired trajectory range. The angle-dependent color change of the display panel of Experimental Example 1 at the standard coordinates (0.1754, 0.1579) can be located within the range of a MacAdams ellipse of about 10 or less. Therefore, in the case of the display device of Experimental Example 1, the color change caused by the change in viewing angle relative to blue light can not be observed by the human eye.

[0152] [Whether the required trajectory is met depends on the color filter]

[0153] Comparative Example 2A

[0154] A display device excluding a color filter is prepared. Color coordinates of the display device are measured.

[0155] Comparative Example 2B

[0156] A display device including a color filter was prepared. The color filter of the display device according to Comparative Example 2B filtered out light having a wavelength greater than about 480 nm and transmitted light having a wavelength of about 480 nm or less. The color coordinates of the display device according to Comparative Example 2B were measured in the same manner as in Comparative Example 2A.

[0157] Comparative Example 2C

[0158] A display device including a color filter was prepared. The color filter of the display device according to Comparative Example 2C filtered out light having a wavelength greater than about 470 nm and transmitted light having a wavelength of about 470 nm or less. The color coordinates of the display device according to Comparative Example 2C were measured in the same manner as in Comparative Example 2A.

[0159] Experimental Example 2

[0160] A display device including a color filter was prepared. The color filter of the display device according to Experimental Example 2 filtered out light having a wavelength greater than about 460 nm and transmitted light having a wavelength of about 460 nm or less. Fig. 6A or Figure 6B The color coordinates of the display device according to Experimental Example 2 were measured in the same manner as in Comparative Example 2A.

[0161] Fig.9A is a schematic diagram showing color coordinates of a display device according to Comparative Example 2A. Fig. 9B is a schematic diagram showing color coordinates of a display device according to Comparative Example 2B. Fig. 9C is a schematic diagram showing color coordinates of a display device according to Comparative Example 2C. Fig.9D is a schematic diagram showing the color coordinates of the display device according to Experimental Example 2 of the present disclosure. Fig.9A , Fig. 9B , Fig. 9C and Fig.9D In FIG. 1 , the dashed line may represent the desired trajectory. The desired trajectory may be located within an ellipse as the MacAdams ellipse 10. Fig.9A , Fig. 9B , Fig. 9C and Fig.9D In FIG. 1 , 0°, 15°, 30°, 45°, and 60° may refer to viewing angles.

[0162] refer to Fig.9A , Fig. 9B and Fig. 9C The angle-dependent color change of the display panel of the display device of Comparative Example 2A at the standard coordinates (0.1754, 0.1579) may deviate from the desired trajectory. The angle-dependent color change of the display panel of the display device of Comparative Example 2A at the standard coordinates (0.1754, 0.1579) may deviate from the range of MacAdams ellipse 10.

[0163] refer to Fig. 9B The angle-dependent color change of the display panel of the display device of Comparative Example 2B at the standard coordinates (0.1754, 0.1579) may deviate from the desired trajectory. The angle-dependent color change of the display panel of the display device of Comparative Example 2B at the standard coordinates (0.1754, 0.1579) may deviate from the range of MacAdams ellipse 10.

[0164] refer to Fig. 9CThe angle-dependent color change of the display panel of the display device of Comparative Example 2C at the standard coordinates (0.1754, 0.1579) may deviate from the desired trajectory. The angle-dependent color change of the display panel of the display device of Comparative Example 2C at the standard coordinates (0.1754, 0.1579) may deviate from the range of MacAdams ellipse 10.

[0165] refer to Fig.9D , the angle-dependent color change of the display panel of the display device of Experimental Example 2 at the standard coordinates (0.1754, 0.1579) can be within the desired trajectory. In other words, the angle-dependent color change of the display panel of Experimental Example 2 at the standard coordinates (0.1754, 0.1579) can be within the range of a MacAdams ellipse of about 10 or less. The display device of Experimental Example 2 may include a color filter having a transmittance of about 0.5 or less at a second wavelength greater than about 460nm, and the color change caused by the change in viewing angle relative to the blue light emitted from the display device may not be observed by the human eye.

[0166] According to an embodiment, a user may not recognize a viewing angle-dependent color change of a display device with respect to blue light, and thus may equally recognize colors viewed from the front and side surfaces of the display device. Therefore, the display device may have improved image characteristics.

[0167] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for limiting purposes. The description of features or aspects within each embodiment should generally be considered applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure and as defined by the appended claims.

Claims

1. A display device, comprising a display panel, wherein the display panel comprises: A light-emitting device, disposed in an emission region on the substrate, the light-emitting device comprising a pixel electrode, an emission layer and a counter electrode; as well as a color filter, arranged on the light-emitting device, wherein the transmittance of the color filter to light of a first wavelength is less than the transmittance of the color filter to light of a second wavelength, and the transmittance of the color filter to light of the second wavelength is 0.5 or less, The first wavelength is in the range of 380 nm to 460 nm, The second wavelength is in the range of 460 nm to 780 nm, The wavelength-dependent transmittance curve of the color filter has a negative slope less than 0 at a wavelength of 460 nm, an emission spectrum of the display panel in the emission region over the substrate has a Z value of tristimulus values ​​in a range of 0.82 to 1, and The display panel has an angle-dependent color variation within 10 or less MacAdams ellipses at standard coordinates (0.1754, 0.1579) in the emission region over the substrate.

2. The display device according to claim 1, wherein: The peak wavelength of the wavelength-dependent transmittance graph of the color filter is 460 nm or less.

3. The display device according to claim 1, wherein: The emitting layer includes a material that emits light at the first wavelength.

4. The display device according to claim 1, wherein: The pixel electrode includes a lower transparent electrode, a metal electrode disposed on the lower transparent electrode, and an upper transparent electrode, and The counter electrode includes a metal layer.

5. The display device according to claim 1, wherein: The transmitting layer comprises: a first emission layer; and a second emitting layer disposed above and vertically spaced apart from the first emitting layer, and The light emitting device further includes a first charge generation layer disposed between the first emission layer and the second emission layer.

6. The display device according to claim 5, wherein: The emission layer further includes a third emission layer disposed between the second emission layer and the opposite electrode, and The light emitting device further includes a second charge generation layer disposed between the second emission layer and the third emission layer.

7. The display device according to claim 1, wherein: The light emitting device further comprises: a lower common layer disposed on a lower surface of the emission layer and including at least one of a hole transport layer and a hole injection layer; and The upper common layer is disposed on the upper surface of the emission layer and includes at least one of an electron transport layer and an electron injection layer.

8. The display device according to claim 1, further comprising: A first inorganic encapsulation layer is disposed on the light-emitting device; an organic encapsulation layer, disposed on the first inorganic encapsulation layer; as well as The second inorganic encapsulation layer is disposed on the organic encapsulation layer.

9. The display device according to claim 8, further comprising: A touch sensor layer is disposed on the second inorganic encapsulation layer, Wherein, the color filter is arranged on the touch sensor layer.

10. The display device according to claim 9, further comprising: a light blocking pattern disposed on the touch sensor layer and including an upper opening exposing an upper surface of the touch sensor layer, The color filter is disposed on the exposed upper surface of the touch sensor layer and in the upper opening of the light blocking pattern.

11. The display device according to claim 10, further comprising: A cover window, disposed on the color filter; as well as A window adhesive layer is disposed between the color filter and the cover window, wherein the window adhesive layer comprises an optically clear adhesive.

12. The display device according to claim 11, further comprising: A pixel circuit layer is disposed on the substrate, and the pixel circuit layer includes a thin film transistor, The thin film transistor includes a semiconductor layer, a gate electrode, a source electrode and a drain electrode, and The pixel electrode is electrically connected to the thin film transistor.

13. The display device according to claim 12, further comprising: A buffer layer, disposed between the substrate and the thin film transistor; A gate insulating layer, disposed between the semiconductor layer and the gate electrode; as well as an interlayer insulating layer, disposed on the gate electrode, Wherein, the source electrode and the drain electrode are arranged on the interlayer insulating layer.

14. A display device, comprising a display panel, wherein the display panel comprises: a light emitting device disposed in an emission region above the substrate and emitting light of a first wavelength; as well as a color filter, arranged on the light-emitting device, wherein the transmittance of the color filter to light of the first wavelength is lower than the transmittance of the color filter to light of a second wavelength, and the second wavelength is greater than the first wavelength, and The angle-dependent color variation of the display panel at the standard coordinates (0.1754, 0.1579) in the emission region over the substrate is within the locus of a MacAdams ellipse of 10.

15. The display device according to claim 14, wherein: The first wavelength includes a visible light wavelength of 460 nm or less, and The second wavelength includes a visible light wavelength of 460 nm or greater.

16. The display device according to claim 15, wherein: The wavelength-dependent transmittance curve of the color filter has a negative slope at a wavelength of 460 nm, and The wavelength-dependent transmittance graph of the color filter has a peak wavelength of less than 460 nm.

17. The display device according to claim 14, wherein: The light emitting device includes a transparent pixel electrode, an emission layer disposed on the transparent pixel electrode, and a transparent opposite electrode.

18. The display device according to claim 17, wherein: An emission spectrum of the display panel in the emission region over the substrate has a Z value of tristimulus values ​​in a range of 0.8 to 1.

19. The display device according to claim 14, wherein: an emission spectrum of the display panel in the emission region over the substrate has a Z value of tristimulus values ​​in a range of 0.82 to 1, and The light emitting device comprises: A pixel electrode, comprising a lower transparent electrode, a metal electrode disposed on the lower transparent electrode, and an upper transparent electrode; an emission layer, disposed on the pixel electrode; and The counter electrode includes a metal layer.

20. The display device according to claim 14, further comprising: A thin film encapsulation layer is disposed on the light emitting device and encapsulates the light emitting device.

Images