Display device

Abstract

The display device includes a display panel comprising a folding area and a flat area adjacent to the folding area, a window disposed on the display panel, and a window protection layer disposed on the window, satisfying at least one of the following Formula 1 and Formula 2. [Equation 1] A1XA2 < 0 [Equation 2] B1XB2 < 0 In Equation 1 and Equation 2 above, A1 is the a* value of the display panel in the CIE-Lab color coordinate system, A2 is the a* value of the window protection layer in the CIE-Lab color coordinate system, B1 is the b* value of the display panel in the CIE-Lab color coordinate system, and B2 is the b* value of the window protection layer in the CIE-Lab color coordinate system.

Description

Technology Field

[0001] The present invention relates to a display device. More specifically, the present invention relates to a display device with improved reflective color. Background Technology

[0002] As a display device is equipped with wiring, electrodes, etc., including metal, external light incident on the display device may be reflected from the wiring, electrodes, etc. To prevent such reflection caused by external light, the display device generally includes a polarizing plate. However, while the polarizing plate can prevent reflection caused by external light, the light efficiency of the display device may be reduced due to the polarizing plate.

[0003] Accordingly, research is continuing to improve the reflective color of display devices and enhance visibility without using polarizers. The problem to be solved

[0004] The objective of the present invention is to provide a display device with improved reflective color and enhanced visibility.

[0005] However, the purpose of the present invention is not limited to such purposes, and may be expanded in various ways without departing from the spirit and scope of the present invention. means of solving the problem

[0006] To achieve one objective of the present invention as described above, a display device according to one embodiment of the present invention includes a display panel comprising a folding area and a flat area adjacent to the folding area, a window disposed on the display panel, and a window protection layer disposed on the window, and may satisfy at least one of the following Formula 1 and Formula 2.

[0007] [Equation 1]

[0008] A1XA2 < 0

[0009] [Equation 2]

[0010] B1XB2 < 0

[0011] In the above Equations 1 and 2, A1 may be the a* value of the display panel in the CIE-Lab color coordinate system, A2 may be the a* value of the window protection layer in the CIE-Lab color coordinate system, B1 may be the b* value of the display panel in the CIE-Lab color coordinate system, and B2 may be the b* value of the window protection layer in the CIE-Lab color coordinate system.

[0012] In one embodiment, the window protection layer has a structure in which a plurality of layers are stacked, and at least one of the plurality of layers can selectively absorb light of a specific wavelength band.

[0013] In one embodiment, the window protective layer may include a protective film disposed on the window and an adhesive layer disposed between the window and the protective film.

[0014] In one embodiment, the window protection layer may further include a color correction layer adjacent to the protection film.

[0015] In one embodiment, the color correction layer can selectively absorb light of a specific wavelength band.

[0016] In one embodiment, the color correction layer may include at least one of a pigment and a dye.

[0017] In one embodiment, the thickness of the color correction layer may be approximately 10 µm or less.

[0018] In one embodiment, the protective film can selectively absorb light of a specific wavelength band.

[0019] In one embodiment, the adhesive layer can selectively absorb light of a specific wavelength band.

[0020] In one embodiment, the window protective layer may further include a functional layer disposed on the protective film and having a thickness of approximately 10 µm or less.

[0021] In one embodiment, the functional layer may include a hard coating layer disposed on the protective film.

[0022] In one embodiment, the hard coating layer can selectively absorb light of a specific wavelength band.

[0023] In one embodiment, the functional layer may include a first refractive layer disposed on the protective film, and a second refractive layer disposed on the first refractive layer, having a refractive index lower than that of the first refractive layer, and comprising a fingerprint-resistant material.

[0024] In one embodiment, the first refractive layer can selectively absorb light of a specific wavelength band.

[0025] In one embodiment, the functional layer may include a first refractive layer disposed on the protective film, a second refractive layer disposed on the first refractive layer and having a refractive index lower than that of the first refractive layer, and an anti-fingerprint layer disposed on the second refractive layer and comprising an anti-fingerprint material.

[0026] In one embodiment, the display panel may include a substrate, light-emitting elements disposed on the substrate and emitting light, and an anti-reflection layer disposed on the light-emitting elements and including a light-blocking member.

[0027] In one embodiment, the display panel may further include an overcoat layer disposed on the anti-reflection layer. The anti-reflection layer may further include color filters corresponding to the light-emitting elements.

[0028] To achieve one objective of the present invention as described above, a display device according to another embodiment of the present invention includes a display panel comprising a folding area and a flat area adjacent to the folding area, a window disposed on the display panel, and a window protection layer disposed on the window, and may satisfy at least one of the following Equation 3 and Equation 4.

[0029] [Equation 3]

[0030] |A1| > |A3|

[0031] [Equation 4]

[0032] |B1| > |B3|

[0033] In the above Equations 3 and 4, A1 may be the a* value of the display panel in the CIE-Lab color coordinate system, A3 may be the a* value of the display device in the CIE-Lab color coordinate system, B1 may be the b* value of the display panel in the CIE-Lab color coordinate system, and B3 may be the b* value of the display device in the CIE-Lab color coordinate system.

[0034] In one embodiment, the display device may satisfy at least one of the following Formula 1 and Formula 2.

[0035] [Equation 1]

[0036] A1XA2 < 0

[0037] [Equation 2]

[0038] B1XB2 < 0

[0039] In the above Equations 1 and 2, A1 may be the a* value of the display panel in the CIE-Lab color coordinate system, A2 may be the a* value of the window protection layer in the CIE-Lab color coordinate system, B1 may be the b* value of the display panel in the CIE-Lab color coordinate system, and B2 may be the b* value of the window protection layer in the CIE-Lab color coordinate system.

[0040] In one embodiment, the window protection layer has a structure in which a plurality of layers are stacked,

[0041] At least one of the above plurality of layers can selectively absorb light of a specific wavelength band. Effects of the invention

[0042] A display device according to embodiments of the present invention may include a display panel, a window disposed on the display panel, and a window protection layer that protects the window. The window protection layer has a structure in which a plurality of layers, including a protective film, are laminated, and at least one of the plurality of layers constituting the window protection layer can selectively absorb light of a specific wavelength band. Accordingly, the window protection layer can correct the reflective color of the display device. For example, the a* and b* values ​​of the window protection layer in the CIE-Lab color coordinate system can be adjusted to correspond to the a* and b* values ​​of the display panel in the CIE-Lab color coordinate system.

[0043] Accordingly, the reflective color of the display device can be easily corrected by adjusting the a* and / or b* values ​​of the window protection layer in the CIE-Lab color coordinate system without changing the structure and / or configuration of the display panel. Therefore, the reflective color of the display device can be improved, and the visibility of the display device can be enhanced. In addition, the manufacturing process of the display device can be simplified, and the manufacturing cost of the display device can be reduced.

[0044] However, the effects of the present invention are not limited to the above effects, and may be extended in various ways without departing from the spirit and scope of the present invention. Brief explanation of the drawing

[0045] FIG. 1 is a plan view showing a display device according to embodiments of the present invention. FIG. 2 is a cross-sectional view showing one embodiment of the display device of FIG. 1. FIG. 3 is a cross-sectional view showing a display panel included in the display device of FIG. 2. Figure 4 is a diagram showing the CIE-Lab color coordinate system. FIGS. 5 to 9 are drawings showing a display device according to embodiments of the present invention. Specific details for implementing the invention

[0046] Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. Identical components in the drawings are given the same reference numerals, and redundant descriptions of identical components are omitted.

[0047] FIG. 1 is a plan view showing a display device according to embodiments of the present invention, FIG. 2 is a cross-sectional view showing one embodiment of the display device of FIG. 1, and FIG. 3 is a cross-sectional view showing a display panel included in the display device of FIG. 2. For example, FIG. 2 may be a cross-sectional view showing one example cut along the line I-I' of FIG. 1.

[0048] Referring to FIG. 1, a display device (DD) according to embodiments of the present invention may include a display panel (PNL), a window (WIN), and a window protection layer (WPL). The window (WIN) may be placed on the display panel (PNL), and the window protection layer (WPL) may be placed on the window (WIN).

[0049] The display panel (PNL) can display images, and the window (WIN) can protect the display panel (PNL). The window protection layer (WPL) is placed on the top of the display device (DD) and can protect the window (WIN).

[0050] In one embodiment, the display panel (PNL) may include a folding area (FA) and a flat area (PA) adjacent to the folding area (FA). For example, as illustrated in FIG. 1, the display panel (PNL) may include a folding area (FA) that overlaps with the central part of the display panel (PNL) and flat areas (PA) adjacent to the left and right sides of the folding area (FA). The display panel (PNL) may be folded in the folding area (FA). Accordingly, the window (WIN) and the window protection layer (WPL) may be folded in the folding area (FA).

[0051] Referring to FIGS. 2 and 3, a display device (DD) according to one embodiment of the present invention may include a display panel (PNL), a window (WIN), a window protection layer (WPL), a protection member (PM), a cushioning member (CM), a support member (SM), a first adhesive layer (ADL1), a second adhesive layer (ADL2), and a third adhesive layer (ADL3).

[0052] Here, the window protection layer (WPL) may include a fourth adhesive layer (ADL4), a color correction layer (CAL), a protective film (PF), and a functional layer (FL). Here, the functional layer (FL) may include a hard coating layer (HC), a first refractive layer (RL1), and a second refractive layer (RL2).

[0053] As illustrated in FIG. 3, the display panel (PNL) may include a substrate (SUB), a buffer layer (BFR), first to third driving elements (TR1, TR2, TR3), an insulating structure (IS), a pixel defining film (PDL), first to third light-emitting elements (LED1, LED2, LED3), an encapsulation layer (TFE), an anti-reflective layer (ARL), and an overcoat layer (OC). Here, the anti-reflective layer (ARL) may include a light-blocking member (BM), a first color filter (CF1), a second color filter (CF2), and a third color filter (CF3).

[0054] The substrate (SUB) may include glass, quartz, plastic, etc. For example, the substrate (SUB) may be a plastic substrate and may include polyimide (PI). In one embodiment, the substrate (SUB) may have a structure in which at least one polyimide layer and at least one barrier layer are alternately stacked.

[0055] A buffer layer (BFR) may be disposed on a substrate (SUB). The buffer layer (BFR) may include silicon oxide, silicon nitride, etc. The buffer layer (BFR) can prevent impurities from diffusing onto the substrate (SUB). In other embodiments, the buffer layer (BFR) may be omitted.

[0056] The first to third driving elements (TR1, TR2, TR3) may be disposed on a buffer layer (BFR). In one embodiment, each of the first to third driving elements (TR1, TR2, TR3) may include at least one thin-film transistor. The channel layer of the transistor may include an oxide semiconductor, a silicon semiconductor, an organic semiconductor, etc. For example, the oxide semiconductor may include at least one oxide selected from indium (In), gallium (Ga), tin (Sn), zirconium (Zr), vanadium (V), hafnium (Hf), cadmium (Cd), germanium (Ge), chromium (Cr), titanium (Ti), and zinc (Zn). The silicon semiconductor may include amorphous silicon, polycrystalline silicon, etc.

[0057] The insulating structure (IS) can cover the first to third driving elements (TR1, TR2, TR3). The insulating structure (IS) may include a combination of an inorganic insulating layer and an organic insulating layer. For example, the inorganic insulating layer may include silicon oxide (SiOx), silicon nitride (SiNx), silicon carbide (SiCx), silicon oxynitride (SiOxNy), silicon oxycarbide (SiOxCy), etc. Additionally, the organic insulating layer may include photoresist, polyacryl-based resin, polyimide-based resin, polyamide-based resin, siloxane-based resin, acrylic-based resin, epoxy-based resin, etc. These may each be used individually or in combination with each other.

[0058] First to third pixel electrodes (AE1, AE2, AE3) may be disposed on an insulating structure (IS). Each of the first to third pixel electrodes (AE1, AE2, AE3) may include a conductive material such as a metal, an alloy, a conductive metal nitride, a conductive metal oxide, or a transparent conductive material. Each of the first to third pixel electrodes (AE1, AE2, AE3) may have a single-layer structure or a multi-layer structure including a plurality of conductive layers.

[0059] The first to third pixel electrodes (AE1, AE2, AE3) can be electrically connected to the first to third driving elements (TR1, TR2, TR3) respectively through contact holes formed in the insulating structure (IS).

[0060] A pixel defining film (PDL) may be disposed on the first to third pixel electrodes (AE1, AE2, AE3). The pixel defining film (PDL) may include an organic insulating material. Examples of the organic insulating material include photoresist, polyacryl-based resin, polyimide-based resin, polyamide-based resin, siloxane-based resin, acrylic-based resin, epoxy-based resin, etc. These may be used alone or in combination with each other. The pixel defining film (PDL) may define a pixel opening that exposes at least a portion of each of the first to third pixel electrodes (AE1, AE2, AE3). The light-emitting region and non-light-emitting region of the display device (DD) may be defined by the pixel opening. For example, the portion where the pixel opening is located may correspond to the light-emitting region, and the portion where the pixel defining film (PDL) is placed may correspond to the non-light-emitting region.

[0061] First to third light-emitting layers (EL1, EL2, EL3) may be disposed on first to third pixel electrodes (AE1, AE2, AE3) exposed by the pixel opening of the pixel defining film (PDL). For example, a first light-emitting layer (EL1) may be disposed on the first pixel electrode (AE1), a second light-emitting layer (EL2) may be disposed on the second pixel electrode (AE2), and a third light-emitting layer (EL3) may be disposed on the third pixel electrode (AE3).

[0062] In one embodiment, the first light-emitting layer (EL1) may include a light-emitting material that emits red light (Lr), the second light-emitting layer (EL2) may include a light-emitting material that emits green light (Lg), and the third light-emitting layer (EL3) may include a light-emitting material that emits blue light (Lb). However, the present invention is not necessarily limited thereto.

[0063] In one embodiment, a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, etc. may be disposed on the upper and / or lower portions of each of the first to third light-emitting layers (EL1, EL2, EL3).

[0064] A common electrode (CE) may be disposed on the first to third light-emitting layers (EL1, EL2, EL3). The common electrode (CE) may include a conductive material such as a metal, an alloy, a conductive metal nitride, a conductive metal oxide, or a transparent conductive material. The common electrode (CE) may have a single-layer structure or a multi-layer structure including a plurality of conductive layers. In one embodiment, the common electrode (CE) may be continuously extended across a plurality of pixels.

[0065] A first pixel electrode (AE1), a first light-emitting layer (EL1), and a common electrode (CE) can form a first light-emitting element (LED1), a second pixel electrode (AE2), a second light-emitting layer (EL2), and a common electrode (CE) can form a second light-emitting element (LED2), and a third pixel electrode (AE3), a third light-emitting layer (EL3), and a common electrode (CE) can form a third light-emitting element (LED3). In one embodiment, the first light-emitting element (LED1), the second light-emitting element (LED2), and the third light-emitting element (LED3) may be spaced apart from each other.

[0066] In one embodiment, the first light-emitting element (LED1) can emit red light (Lr), the second light-emitting element (LED2) can emit green light (Lg), and the third light-emitting element (LED3) can emit blue light (Lb). However, the present invention is not necessarily limited thereto.

[0067] Meanwhile, the light-emitting elements included in the display device (DD) may not be limited to the first to third light-emitting elements (LED1, LED2, LED3). For example, the light-emitting element may be a light-emitting element comprising at least one of a micro-LED, a nano-LED, a quantum dot (QD), and a quantum rod (QR).

[0068] The encapsulation layer (TFE) may be disposed on the common electrode (CE). The encapsulation layer (TFE) may include at least one inorganic encapsulation layer and at least one organic encapsulation layer. In one embodiment, the encapsulation layer (TFE) may include a first inorganic encapsulation layer (IL1) disposed on the common electrode (CE), an organic encapsulation layer (OL) disposed on the first inorganic encapsulation layer (IL1), and a second inorganic encapsulation layer (IL2) disposed on the organic encapsulation layer (OL).

[0069] The first color filter (CF1) can correspond to the first light-emitting element (LED1). The second color filter (CF2) can correspond to the second light-emitting element (LED2). The third color filter (CF3) can correspond to the third light-emitting element (LED3). Each of the first to third color filters (CF1, CF2, CF3) can selectively transmit light of a specific wavelength range. For example, each of the first to third color filters (CF1, CF2, CF3) can selectively transmit light of different wavelength ranges.

[0070] In one embodiment, the first color filter (CF1) can selectively transmit red light (Lr), the second color filter (CF2) can selectively transmit green light (Lg), and the third color filter (CF3) can selectively transmit blue light (Lb). However, the present invention is not necessarily limited thereto.

[0071] The light-blocking member (BM) may be placed between the first to third color filters (CF1, CF2, CF3). For example, the light-blocking member (BM) may overlap the entire non-luminous region and have a grid shape on a plane.

[0072] In one embodiment, the light-blocking member (BM) can absorb external light. Accordingly, the light-blocking member (BM) can reduce the external light reflectivity of the display device (DD). Examples of materials that can be used as the light-blocking member (BM) include chromium (Cr), chromium oxide (CrOx), chromium nitride (CrNx), carbon black, black pigment mixtures, black dye mixtures, etc. These may be used alone or in combination with each other.

[0073] The first color filter (CF1), the second color filter (CF2), the third color filter (CF3), and the light-blocking member (BM) can form an anti-reflection layer (ARL). Accordingly, the polarizer can be omitted from the display device (DD). Thus, the structure of the display device (DD) can be simplified. Meanwhile, although not illustrated, in another embodiment, the first color filter (CF1), the second color filter (CF2), and the third color filter (CF3) may be omitted.

[0074] An overcoat layer (OC) may be placed on an anti-reflective layer (ARL). The overcoat layer (OC) may include organic and / or inorganic materials. For example, materials that may be used as the overcoat layer (OC) include polyimide, acrylic, silicon oxide, silicon nitride, etc. These may be used alone or in combination with each other.

[0075] Referring again to FIG. 2, the first adhesive layer (ADL1) can be placed on the display panel (PNL). For example, the first adhesive layer (ADL1) may be an optically clear adhesive (OCA), an optically clear adhesive resin (OCR), a pressure-sensitive adhesive (PSA), etc.

[0076] A window (WIN) may be disposed on the first adhesive layer (ADL1). The window (WIN) may protect the display panel (PNL). For example, the window (WIN) may include colorless polyimide, ultra-thin reinforced glass (UTG), polyethylene terephthalate (PET), polyimide (PI), polyethersulfone (PS), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), etc.

[0077] The second adhesive layer (ADL2) may be disposed on the lower part of the display panel (PNL). For example, the second adhesive layer (ADL2) may be an optically clear adhesive (OCA), an optically clear adhesive resin (OCR), a pressure-sensitive adhesive (PSA), etc.

[0078] A protective member (PM) can be placed below the second adhesive layer (ADL2). The protective member (PM) can prevent the penetration of moisture and oxygen from the outside and absorb external shocks.

[0079] The third adhesive layer (ADL3) may be disposed on the lower part of the protective member (PM). For example, the third adhesive layer (ADL3) may be an optically clear adhesive (OCA), an optically clear adhesive resin (OCR), a pressure-sensitive adhesive (PSA), etc.

[0080] A cushioning member (CM) may be placed below the third adhesive layer (ADL3). The cushioning member (CM) can protect the display panel (PNL) by cushioning external impacts. For example, the cushioning member (CM) may include a material capable of cushioning by containing air, such as a cushion or a sponge. Additionally, the cushioning member (CM) may include acrylic resin, polyurethane, thermoplastic polyurethane, latex, polyurethane foam, polystyrene foam, etc.

[0081] A support member (SM) may be positioned below a buffer member (CM). The support member (SM) may support a display panel (PNL). For example, the support member (SM) may include Invar, an alloy of nickel (Ni) and iron (Fe), stainless steel (SUS), titanium (Ti), copper (Cu), etc. Additionally, holes (H) that overlap with a folding area (FA) may be formed in the support member (SM).

[0082] The fourth adhesive layer (ADL4) can be placed on the window (WIN). For example, the fourth adhesive layer (ADL4) may be an optically clear adhesive (OCA), an optically clear adhesive resin (OCR), a pressure-sensitive adhesive (PSA), etc.

[0083] A color correction layer (CAL) can be disposed on the fourth adhesive layer (ADL4). In one embodiment, the color correction layer (CAL) can selectively absorb light of a specific wavelength band. Accordingly, the color correction layer (CAL) can correct the reflective color of the display device (DD). That is, the color reproduction rate of the display device (DD) can be improved by the color correction layer (CAL).

[0084] In one embodiment, the color correction layer (CAL) can selectively absorb light other than in the wavelength band of approximately 450 nm to approximately 500 nm. In other words, the color correction layer (CAL) can selectively transmit light in the wavelength band of approximately 450 nm to approximately 500 nm. That is, the color correction layer (CAL) can selectively absorb light other than in the blue light wavelength band. However, the range of the wavelength band is not limited to the above example, and the range of the blue light wavelength band may include a range of wavelength bands that can be perceived as blue.

[0085] Optionally, the color correction layer (CAL) may selectively absorb light other than in the wavelength band of approximately 500 nm to approximately 560 nm. In other words, the color correction layer (CAL) may selectively transmit light in the wavelength band of approximately 500 nm to approximately 560 nm. That is, the color correction layer (CAL) may selectively absorb light other than in the green light wavelength band. However, the range of the wavelength band is not limited to the above examples, and the range of the green light wavelength band may include a range of wavelength bands that can be perceived as green.

[0086] Optionally, the color correction layer (CAL) may selectively absorb light outside the wavelength band of approximately 560 nm to approximately 630 nm. In other words, the color correction layer (CAL) may selectively transmit light in the wavelength band of approximately 560 nm to approximately 630 nm. That is, the color correction layer (CAL) may selectively absorb light outside the yellow light wavelength band. However, the range of the wavelength band is not limited to the above examples, and the range of the yellow light wavelength band may include a range of wavelength bands that can be perceived as yellow.

[0087] Optionally, the color correction layer (CAL) may selectively absorb light outside the wavelength band of approximately 630 nm to approximately 680 nm. In other words, the color correction layer (CAL) may selectively transmit light in the wavelength band of approximately 630 nm to approximately 680 nm. That is, the color correction layer (CAL) may selectively absorb light outside the red light wavelength band. However, the range of the wavelength band is not limited to the above examples, and the range of the red light wavelength band may include a range of wavelength bands that can be perceived as red.

[0088] In one embodiment, the color correction layer (CAL) may comprise a polymer resin containing pigments and / or dyes. That is, the color correction layer (CAL) may have a structure in which pigments and / or dyes are dispersed within a base resin. Examples of the base resins that can be used as the color correction layer (CAL) include polyethylene terephthalate (PET), polyimide (PI), polyethersulfone (PS), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), polymethyl methacrylate (PMMA), triacetylcellulose (TAC), cycloolefin, and epoxy. These may be used alone or in combination with each other.

[0089] In one embodiment, the color correction layer (CAL) may include a blue pigment and / or a blue dye. The blue pigment may be a known pigment commonly used among blue pigments, and the blue dye may be a known dye commonly used among blue dyes. For example, the blue pigment may include a blue pigment or a bluish pigment, and the blue dye may include a blue dye or a bluish dye. In this case, the color correction layer (CAL) may selectively absorb light other than in the wavelength band of approximately 450 nm to approximately 500 nm.

[0090] Optionally, the color correction layer (CAL) may include a green pigment and / or a green dye. The green pigment may be a known pigment commonly used among green pigments, and the green dye may be a known dye commonly used among green dyes. For example, the green pigment may include a green pigment or a greenish pigment, and the green dye may include a green dye or a greenish dye. In this case, the color correction layer (CAL) may selectively absorb light other than in the wavelength band of approximately 500 nm to approximately 560 nm.

[0091] Optionally, the color correction layer (CAL) may include a yellow pigment and / or a yellow dye. The yellow pigment may be a known pigment commonly used among yellow pigments, and the yellow dye may be a known dye commonly used among yellow dyes. For example, the yellow pigment may include a yellow pigment or a yellowish pigment, and the yellow dye may include a yellow dye or a yellowish dye. In this case, the color correction layer (CAL) may selectively absorb light outside the wavelength range of approximately 560 nm to approximately 630 nm.

[0092] Optionally, the color correction layer (CAL) may include a red pigment and / or a red dye. The red pigment may be a known pigment commonly used among red pigments, and the red dye may be a known dye commonly used among red dyes. For example, the red pigment may include a red pigment or a reddish pigment, and the red dye may include a red dye or a reddish dye. In this case, the color correction layer (CAL) may selectively absorb light outside the wavelength range of approximately 630 nm to approximately 680 nm.

[0093] In one embodiment, the thickness of the color correction layer (CAL) may be approximately 10 µm or less. Specifically, the thickness of the color correction layer (CAL) may be approximately 1 µm to 10 µm, preferably 1 µm to 5 µm.

[0094] Meanwhile, although FIG. 2 illustrates a color correction layer (CAL) having a single-layer structure and containing dyes and / or pigments, the present invention is not necessarily limited thereto. That is, as long as it can selectively absorb light of a specific wavelength band, the structure and composition of the color correction layer (CAL) are not particularly limited. For example, the color correction layer (CAL) may have a multilayer structure and may not contain dyes and / or pigments. That is, the color correction layer (CAL) may have a multilayer thin film structure capable of selectively absorbing light of a specific wavelength band. In addition, the color correction layer (CAL) may have a structure that is deformed to selectively absorb light of a specific wavelength band by external factors (e.g., ultraviolet (UV) curing, stress, attractive force, etc.).

[0095] A protective film (PF) is placed on a color correction layer (CAL) and can protect a window (WIN). In one embodiment, the protective film (PF) may include a polymer resin. For example, the protective film (PF) may include polyethylene terephthalate (PET), polyimide (PI), polyethersulfone (PS), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), polymethyl methacrylate (PMMA), triacetylcellulose (TAC), cycloolefin, and epoxy, etc.

[0096] Meanwhile, although not illustrated, in another embodiment, the lamination order of the color correction layer (CAL) and the protective film (PF) may be reversed. That is, the protective film (PF) may be placed on the fourth adhesive layer (ADL4), and the color correction layer (CAL) may be placed on the protective film (PF). In other words, the protective film (PF) and the color correction layer (CAL) may be placed adjacent to each other.

[0097] A hard coating layer (HC) is disposed on a protective film (PF) and may have relatively high rigidity. For example, the water contact angle of the hard coating layer (HC) may be greater than approximately 90 degrees. In one embodiment, the hard coating layer (HC) may include a curable resin. Examples of curable resins that can be used as the hard coating layer (HC) include acrylate compounds, siloxane compounds, and silsesquioxane compounds. These may be used alone or in combination with each other.

[0098] The first refractive layer (RL1) may be disposed on the hard coating layer (HC). The first refractive layer (RL1) may have a first refractive index. In one embodiment, the first refractive index may be approximately 1.6 to approximately 1.8. For example, the first refractive index may be approximately 1.6 or approximately 1.7 for light having a wavelength of approximately 550 nm.

[0099] In one embodiment, the first refractive layer (RL1) may be formed of an inorganic material. Examples of inorganic materials that can be used as the first refractive layer (RL1) include silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiOx), tantalum oxide (Ta2O5), hafnium oxide (HfOx), zinc oxide (ZnOx), etc. These may be used alone or in combination with each other.

[0100] A second refractive layer (RL2) may be disposed on a first refractive layer (RL1). The second refractive layer (RL2) may have a second refractive index. In one embodiment, the second refractive index may be greater than the first refractive index. The second refractive index may be approximately 1.7 to 2.0. For example, the second refractive index may be approximately 1.86 or approximately 1.968 for light having a wavelength of approximately 550 nm.

[0101] In one embodiment, the second refractive layer (RL2) may be formed of an inorganic material. Examples of inorganic materials that can be used as the second refractive layer (RL2) include silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiOx), tantalum oxide (Ta2O5), hafnium oxide (HfOx), zinc oxide (ZnOx), etc. These may be used alone or in combination with each other.

[0102] In one embodiment, the second refractive layer (RL2) may be treated to be anti-fingerprinting. For example, the second refractive layer (RL2) may include an anti-fingerprinting material. Examples of anti-fingerprinting materials that can be used in the second refractive layer (RL2) may include metal oxides (e.g., titanium oxide (TiOx)), silicon-based compounds, fluorine-based compounds, etc.

[0103] The hard coating layer (HC), the first refractive layer (RL1), and the second refractive layer (RL2) can constitute a functional layer (FL). As the window protection layer (WPL) includes the functional layer (FL), the durability of the window protection layer (WPL), such as wear resistance and scratch resistance, is improved, and the reflectivity is improved, thereby improving visibility.

[0104] In one embodiment, the thickness of the functional layer (FL) may be approximately 10 µm or less. Specifically, the thickness of the functional layer (FL) may be approximately 1 µm to 10 µm, preferably 1 µm to 5 µm.

[0105] A display device (DD) according to one embodiment of the present invention may include a window protection layer (WPL) that protects a window (WIN). The window protection layer (WPL) includes a protective film (PF) and a color correction layer (CAL), wherein the color correction layer (CAL) is disposed adjacent to the protective film (PF) and can selectively absorb light of a specific wavelength band. Accordingly, the window protection layer (WPL) can correct the reflective color of the display device (DD).

[0106] Figure 4 is a diagram showing the CIE-Lab color coordinate system.

[0107] Below, with reference to FIG. 4, the principle of correcting the reflective color of a display device (DD) through a window protection layer (WPL) is explained in more detail.

[0108] Reflective color can be expressed using the CIE-Lab color coordinate system. The CIE-Lab color coordinate system uses a* values ​​on the horizontal axis and b* values ​​on the vertical axis; positive a* values ​​represent red, negative a* values ​​represent green, positive b* values ​​represent yellow, and negative b* values ​​represent blue, with larger absolute values ​​of a* and b* indicating a greater intensity of the color.

[0109] In one embodiment, the a* value and / or b* value of the window protection layer (WPL) can be corrected by determining the a* value and / or b* value of the display panel (PNL) in the CIE-Lab color coordinate system.

[0110] That is, without changing the structure and / or configuration of the display panel (PNL), the reflective color of the display device (DD) can be easily corrected by adjusting the a* value and / or b* value of the window protection layer (WPL) in the CIE-Lab color coordinate system.

[0111] In one embodiment, the display device (DD) may satisfy at least one of the following Equation 1 and Equation 2.

[0112] [Equation 1]

[0113] A1XA2 < 0

[0114] [Equation 2]

[0115] B1XB2 < 0

[0116] In the above Equation 1, A1 may be the a* value of the display panel (PNL) in the CIE-Lab color coordinate system, and A2 may be the a* value of the window protection layer (WPL) in the CIE-Lab color coordinate system. Additionally, in the above Equation 2, B1 may be the b* value of the display panel (PNL) in the CIE-Lab color coordinate system, and B2 may be the b* value of the window protection layer (WPL) in the CIE-Lab color coordinate system.

[0117] That is, in one embodiment, the display device (DD) may satisfy a structure in which the product of the a* value (A1) of the display panel (PNL) in the CIE-Lab color coordinate system and the a* value (A2) of the window protection layer (WPL) is negative, and / or a structure in which the product of the b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system and the b* value (B1) of the window protection layer (WPL) is negative.

[0118] For example, if the a* value (A1) of the display panel (PNL) in the above CIE-Lab color coordinate system is negative, the a* value (A1) of the window protection layer (WPL) in the above CIE-Lab color coordinate system can be determined as positive. That is, if the reflective color of the display panel (PNL) is close to green, the reflective color of the window protection layer (WPL) can be set to be close to red to correct the reflective color of the display device (DD).

[0119] Conversely, if the a* value (A1) of the display panel (PNL) in the above CIE-Lab color coordinate system is positive, the a* value (A2) of the window protection layer (WPL) in the above CIE-Lab color coordinate system can be determined as negative. That is, if the reflective color of the display panel (PNL) is close to red, the reflective color of the window protection layer (WPL) can be set to be close to green to correct the reflective color of the display device (DD).

[0120] In addition, if the b* value (B1) of the display panel (PNL) in the above CIE-Lab color coordinate system is negative, the b* value (B2) of the window protection layer (WPL) in the above CIE-Lab color coordinate system can be determined as a positive value. That is, if the reflective color of the display panel (PNL) is close to blue, the reflective color of the window protection layer (WPL) can be set to be close to yellow, thereby correcting the reflective color of the display device (DD).

[0121] Conversely, if the b* value (B1) of the display panel (PNL) in the above CIE-Lab color coordinate system is positive, the b* value (B2) of the window protection layer (WPL) in the above CIE-Lab color coordinate system can be determined as negative. That is, if the reflective color of the display panel (PNL) is close to yellow, the reflective color of the window protection layer (WPL) can be set to be close to blue to correct the reflective color of the display device (DD).

[0122] In one embodiment, the display device (DD) may satisfy at least one of the following Equations 3 and 4.

[0123] [Equation 3]

[0124] |A1| > |A3|

[0125] [Equation 4]

[0126] |B1| > |B3|

[0127] In the above Equation 3, A1 may be the a* value of the display panel (PNL) in the CIE-Lab color coordinate system, and A3 may be the a* value of the display device (DD) in the CIE-Lab color coordinate system. Additionally, B1 may be the b* value of the display panel (PNL) in the CIE-Lab color coordinate system, and B3 may be the b* value of the display device (DD) in the CIE-Lab color coordinate system.

[0128] That is, in one embodiment, the display device (DD) may satisfy a structure in which the absolute value of the a* value (A3) of the display device (DD) is smaller than the absolute value of the a* value (A1) of the display panel (PNL) in the CIE-Lab color coordinate system, and / or a structure in which the absolute value of the b* value (B3) of the display device (DD) is smaller than the absolute value of the b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system.

[0129] In other words, in the above CIE-Lab color coordinate system, when the display panel (PNL) exhibits a relatively intense reflection of a specific color, the window protection layer (WPL) can perform the function of canceling out the reflection of the specific color. Accordingly, the intensity of the reflection of the specific color of the display device (DD) can be lower than the intensity of the reflection of the specific color of the display panel (PNL).

[0130] Accordingly, the reflective color of the display device (DD) in the CIE-Lab color coordinate system can be easily corrected without changing the structure and / or configuration of the display panel (PNL). Consequently, the reflective color of the display device (DD) can be improved, and the visibility of the display device (DD) can be enhanced. In addition, the manufacturing process of the display device (DD) can be simplified, and the manufacturing cost of the display device (DD) can be reduced.

[0131] Table 1 below is a comparison table to explain the results of reflective color measurements according to comparative examples and embodiments of the present invention.

[0132] In Table 1 below, the a* value (A1) and b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system, the a* value (A2) and b* value (B2) of the window protection layer (WPL) in the CIE-Lab color coordinate system, and the a* value (A3) and b* value (B3) of the display device (DD) in the CIE-Lab color coordinate system were each measured five times using the KONICA MINOLTA CM-3700A equipment, and the average values ​​are shown in Table 1 below. At this time, the a* value (A2) and b* value (B2) of the window protection layer (WPL) in the CIE-Lab color coordinate system were measured after attaching the window protection layer (WPL) to black tape (3M Electronic Tape). In addition, these values ​​were measured as reflectance values ​​with specular component excluded.

[0133] The display device (DD) used for measuring reflective color tone may include a display panel (PNL), a window (WIN) placed on the display panel (PNL), and a window protection layer (WPL) placed on the window (WIN).

[0134] A1 B1 A2 B2 A1×A2 B1×B2 A3 B3 Example 1 0.22 -3.89 -0.49 4.46 -0.1078 -17.3494 0.15 -1.96 Example 2 -1.15 -5.20 -0.49 4.46 0.5635 -23.192 -1.33 -2.86 Example 3 0.22 -3.89 0.37 5.87 0.0814 -22.8343 0.24 -1.45 Example 4 -1.15 -5.20 0.37 5.87 -0.4255 -30.524 -1.04 -2.23 Comparative Example 1 0.22 -3.89 0.63 -1.63 0.1386 6.3407 0.44 -4.55 Comparative Example 2 -1.15 -5.20 -0.50 -4.09 0.575 216268 -1.18 -6.05 Comparative Example 3 0.22 -3.89 3.84 -1.07 0.8448 4.1623 1.05 -4.36

[0135] In the display device (DD) according to Examples 1 and 4, the product of the a* value (A1) of the display panel (PNL) in the CIE-Lab color coordinate system and the a* value (A2) of the window protection layer (WPL), and the product of the b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system and the b* value (B1) of the window protection layer (WPL) are both negative. In the display device (DD) according to Examples 2 and 3, the product of the b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system and the b* value (B1) of the window protection layer (WPL) is negative.

[0136] In all embodiments, it can be confirmed that the display device (DD) satisfies a structure in which the absolute value of the a* value (A3) of the display device (DD) is smaller than the absolute value of the a* value (A1) of the display panel (PNL) in the CIE-Lab color coordinate system, and / or a structure in which the absolute value of the b* value (B3) of the display device (DD) is smaller than the absolute value of the b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system.

[0137] That is, in all embodiments, when the display panel (PNL) exhibits a relatively intense reflection color of a specific color in the CIE-Lab color coordinate system, the window protection layer (WPL) performs the function of canceling out the reflection color of the specific color, and accordingly, it can be confirmed that the intensity of the reflection color of the specific color of the display device (DD) is lower than the intensity of the reflection color of the specific color of the display panel (PNL).

[0138] On the other hand, in the display device according to Comparative Examples 1 to 3, the product of the a* value (A1) of the display panel (PNL) in the CIE-Lab color coordinate system and the a* value (A2) of the window protection layer (WPL), and the product of the b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system and the b* value (B1) of the window protection layer (WPL) are both positive.

[0139] In all comparison examples, it can be seen that the absolute value of the a* value (A3) of the display device (DD) is greater than the absolute value of the a* value (A1) of the display panel (PNL) in the CIE-Lab color coordinate system, and the absolute value of the b* value (B3) of the display device (DD) is greater than the absolute value of the b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system.

[0140] In other words, all comparative examples can be seen to show that when the display panel (PNL) exhibits a relatively intense specific color reflection in the CIE-Lab color coordinate system, the window protection layer (WPL) fails to perform the function of canceling out the specific color reflection.

[0141] Accordingly, the display device (DD) according to the embodiments of the present invention satisfies a structure in which the product of the a* value (A1) of the display panel (PNL) in the CIE-Lab color coordinate system and the a* value (A2) of the window protection layer (WPL) is negative, and / or a structure in which the product of the b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system and the b* value (B1) of the window protection layer (WPL) is negative, and accordingly, it can be confirmed that it has excellent visibility.

[0142] FIGS. 5 to 9 are drawings illustrating a display device according to embodiments of the present invention. For example, FIGS. 5 to 9 may correspond to the cross-sectional view of FIG. 2.

[0143] In the following, the differences from the display device (DD) described with reference to FIGS. 1 to 4 will be explained, and redundant descriptions will be omitted or simplified.

[0144] Referring to FIG. 5, in one embodiment, the hard coating layer (HC) may selectively absorb light of a specific wavelength band. In this case, the color correction layer (e.g., CAL in FIG. 2) may be omitted. That is, the a* value (A2) and b* value (B2) of the window protection layer (WPL) in the CIE-Lab color coordinate system may be adjusted through the hard coating layer (HC) to correspond to the a* value (A1) and b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system.

[0145] In one embodiment, the hard coating layer (HC) may comprise a polymer resin containing pigments and / or dyes. That is, the hard coating layer (HC) may have a structure in which pigments and / or dyes are dispersed within a base resin. In one embodiment, the base resin used as the hard coating layer (HC) may be a curable resin. Examples of curable resins that can be used as the hard coating layer (HC) may include acrylate compounds, siloxane compounds, and silsesquioxane compounds. These may be used alone or in combination with each other.

[0146] Meanwhile, the description of the pigments and / or dyes included in the hard coating layer (HC) may be substantially the same as the description of the pigments and / or dyes included in the color correction layer (CAL) described with reference to FIG. 2. Accordingly, a detailed description is omitted.

[0147] Meanwhile, although FIG. 5 illustrates that the hard coating layer (HC) has a single-layer structure and contains dyes and / or pigments, the present invention is not necessarily limited thereto. That is, as long as it can selectively absorb light of a specific wavelength band, the structure and composition of the hard coating layer (HC) are not particularly limited. For example, the hard coating layer (HC) may have a multilayer structure and may not contain dyes and / or pigments. That is, the hard coating layer (HC) may have a multilayer thin film structure capable of selectively absorbing light of a specific wavelength band. In addition, the hard coating layer (HC) may have a structure that is deformed to selectively absorb light of a specific wavelength band by external factors (e.g., ultraviolet (UV) curing, stress, attractive force, etc.).

[0148] Referring to FIG. 6, in one embodiment, the first refractive layer (RL1) may selectively absorb light of a specific wavelength band. In this case, the color correction layer (e.g., CAL in FIG. 2) may be omitted. That is, the a* value (A2) and b* value (B2) of the window protection layer (WPL) in the CIE-Lab color coordinate system may be adjusted through the first refractive layer (RL1) to correspond to the a* value (A1) and b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system.

[0149] In one embodiment, the first refractive layer (RL1) may comprise a polymer resin containing a pigment and / or a dye. That is, the first refractive layer (RL1) may have a structure in which a pigment and / or a dye is dispersed within a base resin. In one embodiment, the base resin used as the first refractive layer (RL1) may comprise an inorganic material. Examples of inorganic materials that can be used as the first refractive layer (RL1) include silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiON), aluminum oxide (Al2O3), titanium oxide (TiOx), tantalum oxide (Ta2O5), hafnium oxide (HfOx), zinc oxide (ZnOx), etc. These may be used alone or in combination with each other.

[0150] Meanwhile, the description of the pigment and / or dye included in the first refractive layer (RL1) may be substantially the same as the description of the pigment and / or dye included in the color correction layer (CAL) described with reference to FIG. 2. Accordingly, a detailed description is omitted.

[0151] Meanwhile, although FIG. 6 illustrates that the first refractive layer (RL1) has a single-layer structure and contains dyes and / or pigments, the present invention is not necessarily limited thereto. That is, as long as it can selectively absorb light of a specific wavelength band, the structure and composition of the first refractive layer (RL1) are not particularly limited. For example, the first refractive layer (RL1) may have a multilayer structure and may not contain dyes and / or pigments. That is, the first refractive layer (RL1) may have a multilayer thin film structure capable of selectively absorbing light of a specific wavelength band. In addition, the first refractive layer (RL1) may have a structure that is deformed to selectively absorb light of a specific wavelength band by external factors (e.g., ultraviolet (UV) curing, stress, attractive force, etc.).

[0152] Referring to FIG. 7, in one embodiment, the protective film (PF) may selectively absorb light of a specific wavelength band. In this case, the color correction layer (e.g., CAL in FIG. 2) may be omitted. That is, the a* value (A2) and b* value (B2) of the window protective layer (WPL) in the CIE-Lab color coordinate system may be adjusted through the protective film (PF) to correspond to the a* value (A1) and b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system.

[0153] In one embodiment, the protective film (PF) may comprise a polymer resin containing pigments and / or dyes. That is, the protective film (PF) may have a structure in which pigments and / or dyes are dispersed within a base resin. In one embodiment, the base resin used as the protective film (PF) may include polyethylene terephthalate (PET), polyimide (PI), polyethersulfone (PS), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), polymethyl methacrylate (PMMA), triacetylcellulose (TAC), cycloolefin, and epoxy, etc. These may be used alone or in combination with each other.

[0154] Meanwhile, the description of pigments and / or dyes included in the protective film (PF) may be substantially the same as the description of pigments and / or dyes included in the color correction layer (CAL) described with reference to FIG. 2. Accordingly, a detailed description is omitted.

[0155] Meanwhile, although FIG. 7 illustrates that the protective film (PF) has a single-layer structure and contains dyes and / or pigments, the present invention is not necessarily limited thereto. That is, as long as it can selectively absorb light of a specific wavelength band, the structure and composition of the protective film (PF) are not particularly limited. For example, the protective film (PF) may have a multilayer structure and may not contain dyes and / or pigments. That is, the protective film (PF) may have a multilayer thin film structure capable of selectively absorbing light of a specific wavelength band. In addition, the protective film (PF) may have a structure that is deformed to selectively absorb light of a specific wavelength band by external factors (e.g., ultraviolet (UV) curing, stress, attractive force, etc.).

[0156] Referring to FIG. 8, in one embodiment, the fourth adhesive layer (ADL4) may selectively absorb light of a specific wavelength band. In this case, the color correction layer (e.g., CAL in FIG. 2) may be omitted. That is, the a* value (A2) and b* value (B2) of the window protection layer (WPL) in the CIE-Lab color coordinate system may be adjusted through the fourth adhesive layer (ADL4) in correspondence with the a* value (A1) and b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system.

[0157] In one embodiment, the fourth adhesive layer (ADL4) may comprise a polymer resin containing pigments and / or dyes. That is, the fourth adhesive layer (ADL4) may have a structure in which pigments and / or dyes are dispersed within a base resin. In one embodiment, the base resin used as the fourth adhesive layer (ADL4) may include an optically clear adhesive (OCA), an optically clear adhesive resin (OCR), a pressure-sensitive adhesive (PSA), etc. These may be used alone or in combination with each other.

[0158] Meanwhile, the description of the pigment and / or dye included in the fourth adhesive layer (ADL4) may be substantially the same as the description of the pigment and / or dye included in the color correction layer (CAL) described with reference to FIG. 2. Accordingly, a detailed description is omitted.

[0159] Meanwhile, although FIG. 8 illustrates that the fourth adhesive layer (ADL4) has a single-layer structure and contains dyes and / or pigments, the present invention is not necessarily limited thereto. That is, as long as it can selectively absorb light of a specific wavelength band, the structure and composition of the fourth adhesive layer (ADL4) are not particularly limited. For example, the fourth adhesive layer (ADL4) may have a multilayer structure and may not contain dyes and / or pigments. That is, the fourth adhesive layer (ADL4) may have a multilayer structure capable of selectively absorbing light of a specific wavelength band. In addition, the fourth adhesive layer (ADL4) may have a structure that is deformed to selectively absorb light of a specific wavelength band by external factors (e.g., ultraviolet (UV) curing, stress, attractive force, etc.).

[0160] Referring to FIG. 9, in one embodiment, the functional layer (FL) may further include an anti-fingerprint layer (AF) comprising an anti-fingerprint material. In one embodiment, the anti-fingerprint layer (AF) may be disposed on the second refractive layer (RL2). Examples of anti-fingerprint materials that can be used for the anti-fingerprint layer (AF) may include metal oxides (e.g., titanium oxide (TiOx)), silicon-based compounds, fluorine-based compounds, etc.

[0161] According to the embodiments, the display device (DD) may include a window protection layer (WPL) that protects the window (WIN). The window protection layer (WPL) has a structure in which a plurality of layers, including a protective film (PF), are laminated, and at least one of the plurality of layers constituting the window protection layer (WPL) can selectively absorb light of a specific wavelength band. Accordingly, the window protection layer (WPL) can correct the reflective color of the display device (DD). For example, the a* value (A2) and b* value (B2) of the window protection layer (WPL) in the CIE-Lab color coordinate system can be adjusted to correspond to the a* value (A1) and b* value (B1) of the display panel (PNL) in the CIE-Lab color coordinate system through a layer among the plurality of layers constituting the window protection layer (WPL) that selectively absorbs light of a specific wavelength band.

[0162] Accordingly, the reflective color of the display device (DD) can be easily corrected by adjusting the a* and / or b* values ​​of the window protection layer (WPL) in the CIE-Lab color coordinate system without changing the structure and / or configuration of the display panel (PNL). Therefore, the reflective color of the display device (DD) can be improved, and the visibility of the display device (DD) can be enhanced. In addition, the manufacturing process of the display device (DD) can be simplified, and the manufacturing cost of the display device (DD) can be reduced. Industrial applicability

[0163] The present invention may be applied to display devices and electronic devices including the same. For example, the present invention may be applied to high-resolution smartphones, mobile phones, smartpads, smartwatches, tablet PCs, vehicle navigation systems, televisions, computer monitors, laptops, etc.

[0164] Although the present invention has been described above with reference to exemplary embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as set forth in the following claims. Explanation of the symbols

[0165] DD: Display device FA: Folding area PA: Flat area PNL: Display panel WIN: Windows WPL: Windows Protection Layer PF: Protective film CAL: Color correction layer FL: Functional layer HC: Hard coating layer RL1: First refractive layer RL2: Second refractive layer AF: Anti-fingerprint layer ADL1, ADL2, ADL3, ADL4: 1st to 4th adhesive layers SUB: Substrate LED1, LED2, LED3: First to third light-emitting elements ARL: Anti-reflective layer BM: Light-blocking element CF1, CF2, CF3: First to third color filters OC: Overcoat layer

Claims

Claim 1 A display device comprising: a display panel including a folding area and a flat area adjacent to the folding area; a window disposed on the display panel; and a window protection layer disposed on the window, satisfying at least one of the following Equation 1 and Equation 2. [Equation 1] A1 × A2 < 0 [Equation 2] B1 × B2 < 0 (wherein Equation 1 and Equation 2, A1 is the a* value of the display panel in the CIE-Lab color coordinate system, A2 is the a* value of the window protection layer in the CIE-Lab color coordinate system, B1 is the b* value of the display panel in the CIE-Lab color coordinate system, and B2 is the b* value of the window protection layer in the CIE-Lab color coordinate system.) Claim 2 A display device according to claim 1, wherein the window protection layer has a structure in which a plurality of layers are stacked, and at least one of the plurality of layers selectively absorbs light of a specific wavelength band. Claim 3 A display device according to claim 1, wherein the window protective layer comprises: a protective film disposed on the window; and an adhesive layer disposed between the window and the protective film. Claim 4 A display device characterized in that, in claim 3, the window protection layer further comprises a color correction layer adjacent to the protection film. Claim 5 A display device according to claim 4, wherein the color correction layer selectively absorbs light of a specific wavelength band. Claim 6 A display device according to claim 4, wherein the color correction layer comprises at least one of a pigment and a dye. Claim 7 A display device according to claim 4, characterized in that the thickness of the color correction layer is 10 µm or less. Claim 8 A display device according to claim 3, wherein the protective film selectively absorbs light of a specific wavelength band. Claim 9 A display device according to claim 3, wherein the adhesive layer selectively absorbs light of a specific wavelength band. Claim 10 A display device according to claim 3, wherein the window protective layer further comprises a functional layer disposed on the protective film and having a thickness of 10 µm or less. Claim 11 A display device characterized in that, in claim 10, the functional layer comprises a hard coating layer disposed on the protective film. Claim 12 A display device according to claim 11, wherein the hard coating layer selectively absorbs light of a specific wavelength band. Claim 13 A display device according to claim 10, wherein the functional layer comprises: a first refractive layer disposed on the protective film; and a second refractive layer disposed on the first refractive layer, having a refractive index lower than that of the first refractive layer and comprising a fingerprint-resistant material. Claim 14 A display device according to claim 13, wherein the first refractive layer selectively absorbs light of a specific wavelength band. Claim 15 A display device according to claim 10, wherein the functional layer comprises: a first refractive layer disposed on the protective film; a second refractive layer disposed on the first refractive layer and having a refractive index lower than that of the first refractive layer; and an anti-fingerprint layer disposed on the second refractive layer and comprising an anti-fingerprint material. Claim 16 A display device according to claim 1, wherein the display panel comprises: a substrate; light-emitting elements disposed on the substrate and emitting light; and an anti-reflection layer disposed on the light-emitting elements and including a light-blocking member. Claim 17 A display device according to claim 16, wherein the display panel further comprises an overcoat layer disposed on the anti-reflection layer, and the anti-reflection layer further comprises color filters corresponding to the light-emitting elements. Claim 18 A display device comprising: a display panel including a folding area and a flat area adjacent to the folding area; a window disposed on the display panel; and a window protection layer disposed on the window, satisfying at least one of the following Equations 3 and 4. [Equation 3] |A1| > |A3| [Equation 4] |B1| > |B3| (In Equations 3 and 4, A1 is the a* value of the display panel in the CIE-Lab color coordinate system, A3 is the a* value of the display device in the CIE-Lab color coordinate system, B1 is the b* value of the display panel in the CIE-Lab color coordinate system, and B3 is the b* value of the display device in the CIE-Lab color coordinate system.) Claim 19 A display device according to claim 18, characterized by satisfying at least one of the following Equation 1 and Equation 2. [Equation 1] A1 × A2 < 0 [Equation 2] B1 × B2 < 0 (wherein Equation 1 and Equation 2, A1 is the a* value of the display panel in the CIE-Lab color coordinate system, A2 is the a* value of the window protection layer in the CIE-Lab color coordinate system, B1 is the b* value of the display panel in the CIE-Lab color coordinate system, and B2 is the b* value of the window protection layer in the CIE-Lab color coordinate system.) Claim 20 A display device according to claim 18, wherein the window protection layer has a structure in which a plurality of layers are stacked, and at least one of the plurality of layers selectively absorbs light of a specific wavelength band.

Images