Cover window and display device including the same

Abstract

The invention relates to a cover window and a display device including the same. According to an embodiment of the present disclosure, a cover window may include: a window layer; a first refractive layer disposed on one surface of the window layer; a second refractive layer disposed on the first refractive layer; a cover layer disposed on the second refractive layer; an adhesive layer disposed between the cover layer and the second refractive layer; and a light blocking layer disposed on the other surface of the window layer, and the first refractive layer may have a refractive index of 1.7 to 1.9.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2023 - 0181039, filed with the Korean Intellectual Property Office (KIPO) on December 13, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical field

[0003] The present disclosure relates to a cover window and a display device including the cover window. Background art

[0004] With the development of information technology, the importance of display devices as a connection medium between users and information has become increasingly prominent. Therefore, research and development of display devices are continuously ongoing.

[0005] A display device may include a display panel and a cover window disposed in front of the display panel. It may be desirable for the cover window to appropriately absorb external shocks to protect the display panel and the like. In addition, it may be desirable for the cover window to have a low reflectance in order to increase the color reproduction rate by reducing the interface reflection of the display device. Summary of the invention

[0006] Aspects of the present disclosure are to provide a cover window and a display device including the cover window, the cover window being capable of reducing reflectance while increasing abrasion resistance by appropriately absorbing external shocks.

[0007] According to an embodiment of the present disclosure, the cover window may include: a window layer; a first refractive layer disposed on one surface of the window layer; a second refractive layer disposed on the first refractive layer; a cover layer disposed on the second refractive layer; an adhesive layer disposed between the cover layer and the second refractive layer; and a light blocking layer disposed on the other surface of the window layer, and the first refractive layer may have a refractive index of 1.7 to 1.9.

[0008] According to an embodiment, the first refractive layer may include stishovite, and the stishovite may be a nano - polycrystal.

[0009] According to an embodiment, the first refractive layer may have a thickness of 5 nm to 50 nm.

[0010] According to an embodiment, the first refractive layer may be formed by a vapor deposition method using one or more of physical vapor deposition (PVD), electron beam (EB) deposition, ion - assisted deposition - electron beam (IAD - EB), laser ablation, vacuum arc deposition, thermal evaporation, and plasma - enhanced chemical vapor deposition (PECVD), and the second refractive layer, the adhesive layer, and the cover layer may be formed by EB at a temperature of 120°C to 350°C.

[0011] According to an embodiment, the cover window may have a reflectance of 0.2% to 0.5% measured in a specular component (SCI) mode.

[0012] According to an embodiment, the second refractive layer may include magnesium fluoride (MgF 2 ) or a solid solution mixed with magnesium fluoride (MgF 2 ), magnesium oxide (MgO), and yttrium oxyfluoride (YOF).

[0013] According to an embodiment, the second refractive layer may have a thickness of 50 nm to 150 nm.

[0014] According to an embodiment, the adhesive layer may include Si 9 Al 2 O 10 .

[0015] According to an embodiment, the adhesive layer may have a thickness of 5 nm to 30 nm.

[0016] According to an embodiment, the cover layer may include perfluoropolyether (PFPE).

[0017] According to an embodiment, the cover layer may have a thickness of 2 nm to 40 nm.

[0018] According to an embodiment, the light blocking layer may have a single-layer or multi-layer structure and may include one or more of allyl polyurethane, epoxy resin, polyester, and epoxy ester.

[0019] According to an embodiment, the light blocking layer may include: a first layer and a second layer provided on one surface of the first layer. The first layer may include allyl polyurethane or polyester and may have a thickness of 3 μm to 8 μm, and the second layer may include epoxy resin and may have a thickness of 5 μm to 10 μm.

[0020] According to an embodiment, the light blocking layer may include: a first layer and a second layer provided on one surface of the first layer. The first layer may include polyester and may have a thickness of 3 μm to 8 μm, and the second layer may include epoxy ester and may have a thickness of 5 μm to 10 μm.

[0021] According to an embodiment, the light blocking layer may include: a first layer, a second layer provided on one surface of the first layer, and a third layer provided on one surface of the second layer. The first and second layers may include polyester, the third layer may include epoxy ester, the first layer may have a thickness of 2 μm to 5 μm, the second layer may have a thickness of 3 μm to 5 μm, and the third layer may have a thickness of 3 μm to 5 μm.

[0022] According to an embodiment, when a hot water resistance test is performed for 30 minutes in a constant temperature water bath having a temperature of 250 °C before depositing the light-shielding layer, and when a hot water resistance test is performed for 30 minutes in a constant temperature water bath having a temperature of 80 ± 2 °C after depositing the light-shielding layer, when measuring the color difference of the cover window using an X-rite Ci 7800 device, the cover window may have a color difference of 0.5 or less.

[0023] According to an embodiment of the present disclosure, the cover window may include: a window layer; a first refractive layer provided on one surface of the window layer; a second refractive layer provided on the first refractive layer; a cover layer provided on the second refractive layer; an adhesive layer provided between the cover layer and the second refractive layer; and a light-shielding layer provided on the other surface of the window layer, and the first refractive layer may include synthetic quartz.

[0024] According to an embodiment, the window layer, the first refractive layer, the second refractive layer, the adhesive layer, and the cover layer may have refractive indices of 1.52, 1.70 to 1.90, 1.38 to 1.40, 1.48, and 1.32, respectively, with respect to a wavelength of 550 nm.

[0025] According to an embodiment, the second refractive layer may include magnesium fluoride (MgF 2 ) or a solid solution mixed with magnesium fluoride (MgF 2 ), magnesium oxide (MgO), and yttrium oxyfluoride (YOF). The adhesive layer may include Si 9 Al 2 O 10 , and the cover layer may include perfluoropolyether (PFPE).

[0026] According to the present disclosure, the display device may include a display panel overlapping with the cover window.

[0027] According to an embodiment of the present disclosure, a cover window and a display device including the cover window that can reduce reflectance while increasing abrasion resistance by appropriately absorbing external shocks may be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features of the present disclosure will become more apparent by describing in further detail embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0029] Figure 1 is a schematic cross-sectional view showing a cover window according to a first embodiment;

[0030] Figure 2 is a schematic cross-sectional view showing a cover window according to a second embodiment;

[0031] Figure 3 is a schematic cross-sectional view showing a cover window according to a third embodiment;

[0032] Figure 4 is a table showing grades according to the peeling area in a tape peeling test; and

[0033] Figure 5 is a schematic cross-sectional view of a display device according to an embodiment. Detailed Embodiments

[0034] The present disclosure may be modified in various ways and have various forms. Accordingly, the detailed embodiments will be shown in the drawings and described in detail in the specification. However, it should be understood that the present disclosure is not intended to be limited to the specific forms disclosed, and the present disclosure includes all modifications, equivalents, and substitutions within the spirit and technical scope of the present disclosure.

[0035] Although terms such as "first", "second", etc. may be used to describe various components, these components are not limited by these terms. These terms are only used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. In the following description, unless otherwise clearly specified in the context, the singular form includes the plural form.

[0036] It should be understood that in this application, terms such as "comprising", "having", etc. are used to specify the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but do not exclude the possibility of the pre-existence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. In addition, in the case where a part of a layer, region, plate, etc. is referred to as being "on" another part, it includes not only the case where this part is directly "on" another part, but also the case where there are other parts between this part and another part. In addition, in this specification, when a part of a layer, region, plate, etc. is formed "on" another part, the forming direction is not limited to the upward direction, but includes the case where this part is formed on the side surface or in the downward direction. Conversely, when a part of a layer, region, plate, etc. is formed "under" another part, this includes not only the case where this part is directly "under" another part, but also the case where there are other parts between this part and another part.

[0037] The present disclosure relates to a cover window and a display device including the cover window. Hereinafter, a cover window and a display device including the cover window according to an embodiment will be described with reference to the drawings.

[0038] Figure 1 is a schematic cross-sectional view showing a cover window according to a first embodiment.

[0039] Reference Figure 1, the cover window 1000 according to the present disclosure may include a window layer 100, a light-blocking layer 50 disposed on one surface (e.g., the rear surface) of the window layer 100, a first refractive layer 200 disposed on the other surface (e.g., the front surface) of the window layer 100, a second refractive layer 300 disposed on the first refractive layer 200, an adhesive layer 400 disposed on the second refractive layer 300, and a cover layer 500 disposed on the adhesive layer 400.

[0040] The cover window 1000 according to the present disclosure may have a reflectivity of 0.2% to 0.5% and improved abrasion resistance. Each configuration is described below.

[0041] The window layer 100 may include glass or a polymer. According to an embodiment, examples of the polymer may include polyimide, but are not limited thereto. According to an embodiment, the window layer 100 may include one or more of glass, a plastic film, and ultra-thin chemically strengthened glass (UTG TM ).

[0042] According to an embodiment, the window layer 100 may have a refractive index of 1.52 with respect to light having a wavelength of 550 nm. However, the present disclosure is not limited thereto.

[0043] The first refractive layer 200 may be positioned (or disposed) on one surface of the window layer 100. The first refractive layer 200 may contact one surface of the window layer 100. The first refractive layer 200 may reduce the reflectivity of the cover window 1000 and improve the abrasion resistance of the cover window 1000.

[0044] The first refractive layer 200 may include super quartz. According to an embodiment, the first refractive layer 200 may include super quartz in a nano-polycrystalline form. For example, the first refractive layer 200 may include polycrystalline super quartz having a nano (nm) crystal size.

[0045] The first refractive layer 200 according to the present disclosure may include super quartz in a nano-polycrystalline form and may improve the vibration-resistant abrasion resistance of the cover window 1000. When the cover window 1000 does not include the first refractive layer 200, a larger number of scratches may occur on the surface of the cover window 1000 than when the cover window 1000 includes the first refractive layer 200 in the case where a grindstone or the like vibrates and rotates on the surface of the cover window 1000. Experimentally, super quartz has relatively high hardness and high toughness (e.g., fracture resistance) compared to other materials. Therefore, due to the material properties of super quartz, the cover window 1000 according to the present disclosure can improve vibration-resistant abrasion resistance.

[0046] The first refractive layer 200 can be formed using at least one vapor deposition method. For example, the vapor deposition method can include physical vapor deposition (PVD), electron beam (EB) deposition, ion-assisted deposition - electron beam (IAD-EB), laser ablation, vacuum arc deposition, thermal evaporation, plasma-enhanced chemical vapor deposition (PECVD), etc.

[0047] According to an embodiment, the first refractive layer 200 can have a refractive index of 1.7 to 1.9 with respect to light having a wavelength of 550 nm. The first refractive layer 200 can be a high refractive index layer.

[0048] The first refractive layer 200 according to the present disclosure can have a refractive index of 1.7 to 1.9, and the cover window 1000 can have a reflectance of 0.2% to 0.5% measured in the specular component included (SCI) mode.

[0049] In a display device DD including the cover window 1000 (refer to Figure 5 ), when surface reflection occurs strongly, the reflectance of the display device DD may increase, and the display quality may deteriorate. In the case of the display device DD, since most of the reflection occurs on the surface of the cover window 1000, it may be necessary to reduce the reflectance of the cover window 1000. The cover window 1000 according to the present disclosure can reduce the reflectance of the cover window 1000 to 0.2% to 0.5%.

[0050] According to an embodiment, the thickness of the first refractive layer 200 can be 5 nm to 50 nm. Hereinafter, in the present disclosure, the thickness is defined as the length along the first direction DR1. When the thickness of the first refractive layer 200 is less than 5 nm, the surface reflectance of the cover window 1000 may not be sufficiently reduced. When the thickness of the first refractive layer 200 is greater than 50 nm, the durability of the cover window 1000 may decrease.

[0051] The second refractive layer 300 can be located on the first refractive layer 200. The second refractive layer 300 can be in contact with the first refractive layer 200.

[0052] According to an embodiment, the second refractive layer 300 can include magnesium fluoride (MgF 2 ). According to an embodiment, the second refractive layer 300 can include a solid solution mixed with magnesium fluoride (MgF 2 ), magnesium oxide (MgO), and yttrium oxyfluoride (YOF).

[0053] According to an embodiment, the second refractive layer 300 may have a refractive index of 1.38 to 1.40 with respect to light having a wavelength of 550 nm. The second refractive layer 300 may be a low refractive index layer having a refractive index lower than that of the first refractive layer 200. Since the refractive index of the second refractive layer 300 satisfies the range described above with respect to light having a wavelength of 550 nm, the surface reflectance of the cover window 1000 can be reduced.

[0054] According to an embodiment, the thickness of the second refractive layer 300 may be 50 nm to 150 nm. When the thickness of the second refractive layer 300 is less than 50 nm, the surface reflectance of the cover window 1000 may not be sufficiently reduced. When the thickness of the second refractive layer 300 is greater than 150 nm, the mechanical strength of the cover window 1000 may be reduced, and thus the durability may be reduced. Therefore, the total thickness of the cover window 1000 may increase, and thus the overall thickness of the display device DD may increase excessively.

[0055] According to an embodiment, the second refractive layer 300 may be formed by an ion-assisted deposition process. According to an embodiment, in the process of forming the second refractive layer 300, magnesium fluoride (MgF 2 ), magnesium oxide (MgO), and yttrium oxyfluoride (YOF) may each be deposited in particulate form, and ionized argon (Ar) gas or oxygen (O 2 ) gas may be provided during the deposition process, and thus the adhesion of the deposited film to the surface of the first refractive layer 200 can be improved. Alternatively, in the process of forming the second refractive layer 300, magnesium fluoride (MgF 2 ) may be formed as a single layer, magnesium fluoride (MgF 2 ) may be deposited in particulate form, and ionized argon (Ar) gas or oxygen (O 2 ) gas may be provided during the deposition process, and thus the adhesion of the deposited film to the surface of the first refractive layer 200 can be improved.

[0056] An adhesive layer 400 may be provided on the second refractive layer 300. The adhesive layer 400 may be in contact with the second refractive layer 300. The adhesive layer 400 may be provided between the second refractive layer 300 and the cover layer 500 to increase the adhesion between the second refractive layer 300 and the cover layer 500.

[0057] The adhesive layer 400 may include SiO 2 and Al 2 O 3 . According to an embodiment, the adhesive layer 400 may include a substitutional solid solution containing SiO 2 and Al 2 O 3 . For example, SiO 2 and Al 2 O3 Each of them may not be included in the adhesive layer 400, and SiO 2 and Al 2 O 3 elements can replace each other in the adhesive layer 400 to form a crystal structure. According to an embodiment, the adhesive layer 400 may include Si 9 Al 2 O 10 .

[0058] According to an embodiment, the refractive index of the adhesive layer 400 with respect to light having a wavelength of 550 nm may be 1.48. Therefore, the adhesive layer 400 can also contribute to reducing the reflectance of the cover window 1000.

[0059] The thickness of the adhesive layer 400 may be 5 nm to 30 nm. When the thickness of the adhesive layer 400 is less than 5 nm, the adhesive performance may decrease, and when the thickness of the adhesive layer 400 is greater than 30 nm, the transmittance may decrease.

[0060] The cover layer 500 may be located on the adhesive layer 400. The cover layer 500 may be in contact with the adhesive layer 400. The cover layer 500 may be located on the surface of the cover window 1000 and may inhibit surface wear.

[0061] According to an embodiment, the cover layer 500 may include perfluoropolyether (PFPE). In PFPE, highly flexible ether bonds are introduced into hard and short perfluoroalkyl chains. Therefore, the cover layer 500 may have soft amorphous properties, excellent anti-fingerprint properties, and excellent sliding properties.

[0062] According to an embodiment, the refractive index of the cover layer 500 with respect to light having a wavelength of 550 nm may be 1.32. Therefore, the cover layer 500 can also contribute to reducing the reflectance of the cover window 1000.

[0063] The thickness of the cover layer 500 may be 2 nm to 40 nm. When the thickness of the cover layer 500 is less than 2 nm, the cover window 1000 may not have sufficient wear resistance. When the thickness of the cover layer 500 is greater than 40 nm, the transmittance of the cover window 1000 may be weakened.

[0064] The light-blocking layer 50 may be positioned along the edge of the cover window 1000. The light-blocking layer 50 may be located on the other surface of the window layer 100. The light-blocking layer 50 may be in contact with the window layer 100.

[0065] The light-blocking layer 50 can prevent lines, circuits, etc. located in the display panel from being recognized from the outside and can prevent light leakage of the display panel. The portion where the light-blocking layer 50 is provided may be the border area of the display device DD.

[0066] Figure 1Shows a configuration in which the light blocking layer 50 is a single layer, but the light blocking layer 50 may have a single-layer or multi-layer structure and may include one or more of allyl polyurethane, epoxy resin, polyester, and epoxy ester.

[0067] According to an embodiment, the thickness of the light blocking layer 50 may be 5 μm to 20 μm. When the thickness of the light blocking layer 50 is 5 μm or less, there may be a risk of light leakage, and when the thickness of the light blocking layer 50 is greater than 20 μm, the step between the region where the light blocking layer 50 is formed and the region where the light blocking layer 50 is not formed may increase, and thus this is not desirable.

[0068] The light blocking layer 50 may have heat resistance capable of withstanding the deposition temperature for forming the second refractive layer 300, the adhesive layer 400, and the cover layer 500 on the window layer 100. According to an embodiment, EB with a process temperature between 120 °C and 350 °C may be used to form the second refractive layer 300, the adhesive layer 400, and the cover layer 500. According to an embodiment, the process temperature may be 150 °C. Therefore, this may be suitable for the light blocking layer 50 to have heat resistance at a temperature of 120 °C to 350 °C without losing adhesion. According to the present disclosure, the second refractive layer 300, the adhesive layer 400, and the cover layer 500 may be continuously formed in one chamber, and the process may be simplified.

[0069] Figure 2 Is a schematic cross-sectional view showing a cover window according to a second embodiment.

[0070] Hereinafter, with reference to Figure 2 Describe the cover window 1000 according to the second embodiment. Except that the light blocking layer 50 includes a first layer 51 and a second layer 52, the second embodiment is the same as Figure 1 The embodiment of. Hereinafter, the detailed description of the same components is omitted.

[0071] The light blocking layer 50 may include a first layer 51 and a second layer 52 provided on one surface (e.g., the lower surface) of the first layer 51. The first layer 51 may be in contact with the window layer 100. The second layer 52 may be in contact with the first layer 51 and may be provided under the first layer 51. In the present disclosure, "under" may be defined as the direction of gravity and may be the direction opposite to the first direction DR1.

[0072] According to an embodiment, the first layer 51 may include allyl polyurethane, and the second layer 52 may include epoxy resin. Optionally, the first layer 51 may include polyester, and the second layer 52 may include epoxy resin. Optionally, the first layer 51 may include polyester, and the second layer 52 may include epoxy ester.

[0073] In the second embodiment, the thickness of the first layer 51 may be from 3 μm to 8 μm. The thickness of the second layer 52 may be from 5 μm to 10 μm.

[0074] Figure 3 is a schematic cross-sectional view showing a cover window according to a third embodiment.

[0075] Hereinafter, reference is made to Figure 3 to describe the cover window 1000 according to the third embodiment. Except that the light-shielding layer 50 includes a first layer 51, a second layer 52, and a third layer 53, the third embodiment is the same as Figure 1 the embodiment of. Hereinafter, detailed descriptions of the same components are omitted.

[0076] Reference is made to Figure 3 , the light-shielding layer 50 may include a first layer 51, a second layer 52 provided on one surface (e.g., the lower surface) of the first layer 51, and a third layer 53 provided on one surface (e.g., the lower surface) of the second layer 52. The first layer 51 may be in contact with the window layer 100. The second layer 52 may be in contact with the first layer 51 and may be provided under the first layer 51. The third layer 53 may be in contact with the second layer 52 and may be provided under the second layer 52.

[0077] According to an embodiment, the first layer 51 and the second layer 52 may include polyester, and the third layer 53 may include epoxy ester.

[0078] In the third embodiment, the thickness of the first layer 51 may be from 2 μm to 5 μm, the thickness of the second layer 52 may be from 3 μm to 5 μm, and the thickness of the third layer 53 may be from 3 μm to 5 μm.

[0079] Then, the physical properties of the cover window 1000 according to the present disclosure are described below with reference to experimental results.

[0080] Figure 4 is a table showing the grades according to the peeling area in the tape peeling test. As Figure 4 shown in, after the tape peeling test, the peeling test of 4B to 5B has a peeling area of less than or equal to 5%.

[0081] Table 1 below shows the results of measuring the physical properties of the cover window 1000 according to the present disclosure in the tape peeling test before / after depositing the light-shielding layer 50.

[0082]

Table 1

[0083]

[0084] Referring to Table 1, the peelability of the cover window 1000 according to the present disclosure was measured after a hot water resistance test for 30 minutes in a constant temperature water bath at a temperature of 250°C before depositing the light shielding layer 50, and after a hot water resistance test for 30 minutes in a constant temperature water bath at a temperature of 80 ± 2°C after depositing the light shielding layer 50. It can be confirmed that the cover window 1000 has an adhesion of 4B or greater, that is, the peeled area after the tape peel test can be less than or equal to 5%, and thus the cover window 1000 has excellent adhesion.

[0085] In addition, the color difference ΔE of the cover window 1000 was measured after a hot water resistance test for 30 minutes in a constant temperature water bath at a temperature of 250°C before depositing the light shielding layer 50, and after a hot water resistance test for 30 minutes in a constant temperature water bath at a temperature of 80 ± 2°C after depositing the light shielding layer 50. When measuring the color difference, an X-rite Ci 7800 device was used. It can be confirmed that the measured value is less than or equal to 0.5, or indicates that the color deviation is imperceptible in appearance.

[0086] Table 2 below shows the results of measuring various physical properties of the cover window 1000 according to the present disclosure.

[0087]

Table 2

[0088]

[0089] Referring to Table 2, all SCI reflectivities of the cover window 1000 according to the present disclosure are between 0.2% and 0.5% (including 0.2% and 0.5%). The SCI reflectivity is a value obtained by measuring the cover window 1000 using an X-rite Ci 7800 device.

[0090] Generally, in the display device DD including the cover window 1000, the reflection occupancy rate of the cover window 1000 can be 77%, and the reflection occupancy rate of the display panel can be 23%. When the display panel has a structure without a polarization layer (less polarization), the efficiency of the display panel can increase by 30% or more, and the color reproducibility can increase by 10% or more, but the reflectivity may increase. For example, compared with a display panel including a polarization layer, the reflectivity of a display panel without a polarization layer can increase by 1.2%. Therefore, in the case of the cover window 1000 of the display device DD without a polarization layer, it may be desirable that the reflectivity is lower than that of the cover window 1000 of the display device DD including a polarization layer. Generally, since the reflectivity of the cover window 1000 of the display device DD including a polarization layer is 8%, the reflectivity of the cover window 1000 of the display device DD without a polarization layer should be lower than 8% to be suitable for the display device DD.

[0091] In the case of the cover window 1000 according to the present disclosure, as confirmed in Table 2, it can be confirmed that the reflectance is between 0.2% and 0.5%, and 0.2% to 0.5% is low enough to be suitable for the display device DD. Therefore, the cover window 1000 according to the present embodiment can be applied to a display device DD that does not include a polarization layer, thereby reducing the reflectance of the display device DD.

[0092] In addition, referring to Table 2, it can be confirmed that a* and b* (which represent color vision excluding the specular component (SCE)) are within a good level range. The color vision (SCE measurement method) is a value obtained by measuring the cover window 1000 using an X-rite Ci 7800 device as described above. It may be desirable for the color vision of the cover window 1000 to satisfy "-2 < a* < 2 and -1.5 < b* < 0.5". Referring to Table 2, it can be confirmed that the color vision (SCE measurement method) of the cover window 1000 according to the present embodiment satisfies the above-described range.

[0093] In addition, referring to Table 2, a wear resistance test using an eraser and steel wool was performed, and the results are shown. The wear resistance test was performed with a load of 1 Kg, 40 reciprocations per minute, and a stroke of 15 mm, and the contact angles were measured after 5000 and 10000 executions, respectively. The standard is that the contact angle is 95° or greater after multiple evaluations and the peeling coating is not visible in appearance.

[0094] In the case of the wear resistance test using an eraser, the cover window 1000 according to the present disclosure shows a contact angle of 95° or greater even after performing the wear resistance test 10000 times, and it can be confirmed that the wear resistance is excellent. Similarly, in the case of the wear resistance test using steel wool, the cover window 1000 according to the present disclosure shows a contact angle greater than 95° even after performing the wear resistance test 10000 times, and it can be confirmed that the wear resistance is excellent.

[0095] That is, since the light blocking layer 50 of the cover window 1000 according to the present disclosure has heat resistance at a temperature of 120°C to 350°C, the cover window 1000 can be manufactured in one chamber, and thus the process can be economical. In addition, the first refractive layer 200 can be included in the cover window 1000, and thus the durability (e.g., wear resistance) of the cover window 1000 can be improved. In addition, since the adhesive layer 400 can include a substitutional solid solution of SiO 2 and Al 2 O 3 therefore, the adhesion to another layer can be improved, the mechanical properties of the cover window 1000 can be improved, and the cover window 1000 can have excellent wear resistance properties.

[0096] In addition, since the cover window 1000 according to the present disclosure has a reflectance of 0.2% to 0.5% as shown in Table 2, the cover window 1000 can be suitable for the display device DD, and the cover window 1000 can have excellent color perception and wear-resistant properties.

[0097] Then, the display device DD including the cover window 1000 according to the present embodiment will be described below Figure 5 as an example. However, Figure 5 the structure of is only an example, and the cover window 1000 can be located on display panels of various structures and is not limited to Figure 5 the structure. Figure 5 is a schematic cross-sectional view of a display device according to an embodiment.

[0098] Referring to Figure 5 , the display device DD may include a substrate SUB. The substrate SUB may include glass or polyimide.

[0099] A transistor TFT may be disposed on the substrate SUB. The transistor TFT may include a gate electrode, a semiconductor layer, a source electrode, and a drain electrode, and may be electrically connected to the first electrode ELT1.

[0100] An interlayer insulating layer ILD may be disposed on the transistor TFT. The interlayer insulating layer ILD may include inorganic insulating materials such as silicon nitride (SiN x ), silicon oxide (SiO x ), and silicon oxynitride (SiO x N y ). Optionally, the interlayer insulating layer ILD may be an organic layer. According to an embodiment, the interlayer insulating layer ILD may include an organic insulating material including general polymers such as polymethyl methacrylate or polystyrene, polymer derivatives having a phenol-based group, allyl-based polymers, imide-based polymers, polyimides, and silicone-based polymers.

[0101] An insulating layer VIA may be disposed on the first electrode ELT1. The insulating layer VIA may be an organic layer. Specifically, the insulating layer VIA may include an organic insulating material including general polymers such as polymethyl methacrylate or polystyrene, polymer derivatives having a phenol-based group, allyl-based polymers, imide-based polymers, polyimides, and silicone-based polymers.

[0102] The insulating layer VIA may include an opening exposing the first electrode ELT1, and a light-emitting layer EL may be located in the opening of the insulating layer VIA. A second electrode ELT2 may be located on the insulating layer VIA and the light-emitting layer EL. The first electrode ELT1, the light-emitting layer EL, and the second electrode ELT2 may constitute a light-emitting element LD.

[0103] According to an embodiment, the first electrode ELT1 may be the anode electrode of the light-emitting element LD, and the second electrode ELT2 may be the cathode electrode of the light-emitting element LD. However, the present disclosure is not limited thereto. According to an embodiment, the first electrode ELT1 may be the cathode electrode of the light-emitting element LD, and the second electrode ELT2 may be the anode electrode of the light-emitting element LD.

[0104] The encapsulation layer TFE may be located on the second electrode ELT2. The encapsulation layer TFE may have a structure in which an inorganic layer and an organic layer are alternately stacked, and may protect the light-emitting element LD from external moisture, humidity, etc.

[0105] The light-blocking member BM may be located on the encapsulation layer TFE. The light-blocking member BM may be located in an area that does not overlap with the light-emitting layer EL, and may be located at a position overlapping a line (not shown) located on the substrate SUB to prevent light leakage.

[0106] The color filter CF may be located on the encapsulation layer TFE. The color filter CF may include a first color filter CF1, a second color filter CF2, and a third color filter CF3.

[0107] The adhesive layer PSA may be located on the color filter CF. The cover window 1000 may be attached through the adhesive layer PSA. The description of the cover window 1000 is the same as that described above, and thus the description of the cover window 1000 is omitted.

[0108] As Figure 5 shown, the display device DD according to the present embodiment may not include a polarization layer therein. In this case, the efficiency may increase by 30% or more, and the color reproducibility may increase by 10% or more, but the reflectance may also increase. However, in the display device DD according to the present disclosure, since the reflectance of the cover window 1000 is 0.2% to 0.5%, the reflectance of the display device DD that does not include a polarization layer may be maintained at a level similar to that of the display device including a polarization layer. Therefore, the efficiency can be improved, and the color reproducibility can be improved without increasing the reflectance.

[0109] As described above, although the present disclosure has been described with reference to the above preferred embodiments, those skilled in the art or those skilled in the art with common general knowledge will understand that various modifications and changes can be made to the present disclosure without departing from the spirit and technical field of the present disclosure described in the claims to be described later.

[0110] Therefore, the technical scope of the present disclosure should not be limited to the content described in the detailed description of the specification, but should be defined by the claims.

Claims

1. Cover window, including: Window layer; A first refractive layer, disposed on a surface of the window layer; a second refractive layer, disposed on the first refractive layer; A cover layer, disposed on the second refractive layer; an adhesive layer, disposed between the cover layer and the second refractive layer; as well as a light-blocking layer, arranged on another surface of the window layer, Wherein, the first refractive layer has a refractive index of 1.7 to 1.

9.

2. The cover window according to claim 1, wherein: The first refractive layer includes super quartz, and Wherein, the super quartz is nano polycrystal.

3. The cover window according to claim 1, wherein: The first refractive layer has a thickness of 5 nm to 50 nm.

4. The cover window according to claim 1, wherein: The first refractive layer is formed by using one or more vapor deposition methods selected from physical vapor deposition (PVD), electron beam (EB) deposition, ion-assisted deposition-electron beam (IAD-EB), laser ablation, vacuum arc deposition, thermal evaporation, and plasma enhanced chemical vapor deposition (PECVD), and The second refractive layer, the adhesive layer and the cover layer are formed by using the EB at a temperature of 120° C. to 350° C.

5. The cover window according to claim 1, wherein: The cover window has a reflectivity of 0.2% to 0.5% measured in a specular component (SCI) mode.

6. The cover window according to claim 1, wherein: The second refractive layer includes magnesium fluoride or a solid solution of magnesium fluoride, magnesium oxide and yttrium oxyfluoride.

7. The cover window according to claim 1, wherein: The second refractive layer has a thickness of 50 nm to 150 nm.

8. The cover window according to claim 1, wherein: The bonding layer includes Si9Al2O 10 .

9. The cover window according to claim 1, wherein: The adhesive layer has a thickness of 5 nm to 30 nm.

10. The cover window according to claim 1, wherein: The cap layer includes perfluoropolyether.

11. The cover window according to claim 1, wherein: The capping layer has a thickness of 2 nm to 40 nm.

12. The cover window according to claim 1, wherein: The light blocking layer has a single-layer or multi-layer structure and includes one or more of acrylic polyurethane, epoxy resin, polyester and epoxy ester.

13. The cover window according to claim 1, wherein: The light blocking layer comprises: First level; and a second layer, disposed on a surface of the first layer, wherein the first layer comprises acrylic polyurethane or polyester and has a thickness of 3 μm to 8 μm, and The second layer includes epoxy resin and has a thickness of 5 μm to 10 μm.

14. The cover window according to claim 1, wherein: The light blocking layer comprises: First level; and a second layer, disposed on a surface of the first layer, wherein the first layer comprises polyester and has a thickness of 3 μm to 8 μm, and The second layer includes epoxy ester and has a thickness of 5 μm to 10 μm.

15. The cover window according to claim 1, wherein: The light blocking layer comprises: First floor; a second layer disposed on one surface of the first layer; and a third layer, disposed on a surface of the second layer, The first layer and the second layer include polyester, the third layer includes epoxy ester, the first layer has a thickness of 2 μm to 5 μm, the second layer has a thickness of 3 μm to 5 μm, and the third layer has a thickness of 3 μm to 5 μm.

16. The cover window according to claim 1, wherein: When the color difference of the cover window is measured using an X-rite Ci 7800 device after a 30-minute hot water resistance test in a constant temperature water bath with a temperature of 250°C before depositing the light-blocking layer, and after a 30-minute hot water resistance test in a constant temperature water bath with a temperature of 80±2°C after depositing the light-blocking layer, the cover window has a color difference of 0.5 or less.

17. Cover window, including: Window layer; A first refractive layer, disposed on a surface of the window layer; a second refractive layer, disposed on the first refractive layer; A cover layer, disposed on the second refractive layer; an adhesive layer, disposed between the cover layer and the second refractive layer; as well as a light-blocking layer, arranged on another surface of the window layer, Wherein, the first refractive layer comprises super quartz.

18. The cover window according to claim 17, wherein: The window layer, the first refractive layer, the second refractive layer, the adhesive layer, and the cap layer have refractive indices of 1.52, 1.7 to 1.9, 1.38 to 1.40, 1.48, and 1.32, respectively, with respect to light having a wavelength of 550 nm.

19. The cover window according to claim 17, wherein: The second refractive layer includes magnesium fluoride or a solid solution of magnesium fluoride, magnesium oxide and yttrium oxyfluoride. Wherein, the bonding layer comprises Si9Al2O 10 ,as well as Wherein, the cover layer comprises perfluoropolyether.

20. Display equipment, including: Window layer; A first refractive layer, disposed on a surface of the window layer; a second refractive layer, disposed on the first refractive layer; A cover layer, disposed on the second refractive layer; an adhesive layer, disposed between the cover layer and the second refractive layer; a light blocking layer, disposed on another surface of the window layer; as well as A display panel overlaps the cover window, Wherein, the first refractive layer has a refractive index of 1.7 to 1.9.

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