Rollable, slidable and stretchable cover window and method of making the same

Abstract

The present invention relates to a cover window and a method for manufacturing the same, comprising: a planar portion formed corresponding to a planar area of ​​a rollable, slidable and stretchable display; and a flexible portion formed to be connected to the planar portion and corresponding to a flexible area of ​​the rollable, slidable and stretchable display, characterized in that it comprises a glass substrate, and a pattern portion for impact compensation formed on the glass substrate, the pattern portion for impact compensation being formed on the flexible portion, or being formed on the planar portion and the flexible portion respectively, and being composed of a pattern of concave and convex shapes.

Description

Technical Field

[0001] The present invention relates to a cover window and a method for manufacturing the same, and more particularly to a rollable, slidable and stretchable cover window and a method for manufacturing the same, in which an impact compensation pattern portion is formed on a glass substrate to prevent the transfer of in-plane microcracks and to disperse stress and impact force to ensure strength characteristics and folding characteristics. Background Art

[0002] In recent years, electrical and electronic equipment has experienced rapid development. In order to meet the needs of the new era and various consumers, various types of display products have emerged. Among them, research on flexible displays that can fold and unfold the screen is currently very active.

[0003] For flexible displays, the research basically starts from foldable and develops into bending, curling, sliding and stretching forms. Not only the display panel but also the cover window used to protect it needs to be flexible.

[0004] This kind of flexible cover window is basically soft and should not leave marks on the folded parts even if it is folded repeatedly, and there should be no distortion of the image quality caused by it.

[0005] Conventional cover windows for flexible displays use polymer films such as PI or PET films on the surface of the display panel.

[0006] However, polymer films have weak mechanical strength and can only play a simple role in preventing scratches on display panels. They have disadvantages such as poor impact resistance and low transmittance, and are known to be relatively expensive.

[0007] In addition, when the display is folded many times, the polymer film will leave marks on the folded part, causing damage to the folded part. For example, when the folding limit evaluation is performed (usually 200,000 times), the polymer film may be pressed or torn.

[0008] In recent years, various studies on glass substrate cover windows have been conducted in order to overcome the limitations of polymer film cover windows.

[0009] The basic physical properties required of such a cover window of a glass substrate are that it must satisfy the folding characteristics, have no image distortion, and have sufficient strength to withstand repeated contact with a touch pen or the like and a certain pressure.

[0010] In recent years, as consumers' demand for flexible displays in various folding modes, such as foldable, rollable, slidable, and stretchable, has increased, research thereon has been actively conducted, and interest has also focused on research on cover windows for protecting such display (OLED) panels.

[0011] As for the existing foldable cover window, the folding test is only performed on one zone (One Zone) of the folding zone (Folding Zone) based on the central axis.

[0012] That is, if the folding characteristics of the folding area based on the center axis (for example, 1.5R reference (4.71mm interval), 5R reference (15.7mm interval)) are measured (two-point bending and folding limit evaluation), the average pass rate of the folding characteristics (Avg. pass rate of Folding Screen) is approximately 90%, and the resulting failure rate (Fail) is approximately 10%.

[0013] In addition, for existing slidable, rollable, and stretchable cover windows, it is necessary to measure the folding characteristics in the entire area (40 to 60% of the total area) that is rolled into the hinge during sliding or rolling.

[0014] For example, for a slidable cover window, when the length of the sliding part is assumed to be 100 mm based on the 5R standard, the expected yield is 0.9^(100 / (5*π))=0.509, which is approximately 50%, while when the length of the sliding part is assumed to be 100 mm based on the 2R standard, the expected yield is 0.9^(100 / (2*π))=0.187, which is approximately 19%.

[0015] The cause of this folding failure is judged to be the inherent defects (Inherent Defect (Compositional: compositional unevenness, Physical defect)) of the glass substrate itself and the physical defects (Physical Defect) generated during the processing process.

[0016] Figure 1 A photograph showing the failure of the folding properties of a conventional cover window due to the migration of in-plane cracks in the folding area due to the above-mentioned inherent defects and physical defects.

[0017] As such, it is necessary to study the optimal cover window structure that satisfies the folding characteristics of the cover window corresponding to various folding methods such as foldable, rollable, slidable, and stretchable, while satisfying the strength characteristics and without image distortion. Summary of the invention

[0018] The present invention is proposed in view of the above-mentioned necessity, and its purpose is to provide a rollable, slidable and stretchable cover window with a pattern portion formed on a glass substrate for impact compensation, thereby preventing the transfer of in-plane microcracks, dispersing stress and impact force, and ensuring strength characteristics and folding characteristics.

[0019] In order to achieve the above-mentioned purpose, the technical essence of the present invention is that the rollable, slidable and stretchable cover window includes: a planar portion formed corresponding to the planar area of ​​the rollable, slidable and stretchable display; and a flexible portion formed to be connected to the above-mentioned planar portion and formed corresponding to the flexible area of ​​the above-mentioned rollable, slidable and stretchable display, characterized in that it includes a glass substrate, and a pattern portion for impact compensation formed on the above-mentioned glass substrate, the above-mentioned pattern portion for impact compensation is formed on the above-mentioned flexible portion, or is respectively formed on the above-mentioned planar portion and the flexible portion, and is composed of a concave-convex pattern.

[0020] In addition, in order to achieve the above-mentioned purpose, the technical gist of the present invention is that the rollable, slidable and stretchable cover window includes: a planar portion formed corresponding to the planar area of ​​the rollable, slidable and stretchable display; and a flexible portion formed to be connected to the planar portion and corresponding to the flexible area of ​​the rollable, slidable and stretchable display. The manufacturing method of the rollable, slidable and stretchable cover window is characterized in that it includes the following steps to form a pattern portion for impact compensation on the flexible portion and the planar portion: a first step of forming a resist layer on a glass substrate; a second step of patterning the resist layer to form a resist pattern layer for forming a first pattern on the entire surface (Total Surface) or the flexible area of ​​the glass substrate; and a third step of using the resist pattern layer of the second step as a mask to form a first pattern on the entire surface (Total Surface) of the glass substrate through a single etching process. The first step is to form a first pattern on the flat surface or the flexible area, and remove the above-mentioned resist pattern layer; the fourth step is to form a resist layer on the glass substrate on which the above-mentioned first pattern is formed; the fifth step is to pattern the above-mentioned resist layer to form a resist pattern layer for forming a second pattern on the above-mentioned flexible area, or to form a resist pattern layer for forming the second pattern on the above-mentioned flexible area and for forming a third pattern on the above-mentioned flat area; the sixth step is to use the resist pattern layer of the above-mentioned fifth step as a mask, and further etch the above-mentioned flexible area through a secondary etching process to form a second pattern in the above-mentioned flexible area, or to etch the entire surface of the above-mentioned glass substrate (Total Surface) through a secondary etching process to form a second pattern in the above-mentioned flexible area and a third pattern in the above-mentioned flat area, and remove the above-mentioned resist pattern layer; and the seventh step is to strengthen the above-mentioned glass substrate.

[0021] The present invention relates to a rollable, slidable and stretchable cover window, and more particularly to a rollable, slidable and stretchable cover window having an impact compensation pattern portion formed on a glass substrate to disperse impact force, improve impact resistance, and ensure strength characteristics and folding characteristics.

[0022] That is, by forming an impact compensation pattern portion on the glass substrate, the transfer of in-plane cracks is prevented, stress is dispersed, and the impact is dispersed between the patterns when the pen is dropped, thereby increasing the rigidity of the pen, thereby improving both the strength characteristics and the folding characteristics.

[0023] In addition, by forming an impact compensation pattern portion on the glass substrate, surface scratches or microcracks formed on the surface of the above-mentioned glass substrate can be removed. By removing and reducing appearance defects, not only the strength characteristics and folding characteristics are improved, but also the yield is improved.

[0024] In addition, the present invention provides a rollable, slidable and stretchable cover window formed of a composite material. By being formed of a composite material of glass and resin material, the glass texture is maintained to the maximum extent while strengthening the softness, resilience, elasticity and strength characteristics of the resin material. In particular, by absorbing impacts such as pen drops in the resin material, the impact resistance is further improved, and the pattern portion for impact compensation can be avoided from being confirmed from the outside.

[0025] Furthermore, by forming the buffer resin layer on the entire surface (Total Surface) between the glass substrates, the impact force such as a pen drop can be absorbed or effectively transmitted to the outside, thereby further improving the pen drop strength characteristics.

[0026] In addition, the stress caused by the difference in glass thickness between the flat area and the folding area in the existing cover window with a thinned folding area can be eliminated, which not only improves the impact resistance brought about by this, but also minimizes image distortion or resolution degradation, thereby having the advantage of being able to provide a high-quality rollable, slidable and stretchable display. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a photograph showing a failure of folding properties caused by migration of in-plane cracks in the folding region of a conventional cover window.

[0028] Figure 2 FIG. 1 is a schematic diagram of a shock compensation pattern portion according to an embodiment of the present invention.

[0029] Figure 3A FIG. 1 is a schematic cross-sectional view of a case where a shock compensation pattern portion is formed on one side of a flexible portion according to an embodiment of the present invention.

[0030] Figure 3B FIG. 1 is a schematic cross-sectional view of a case where impact compensation pattern portions are formed on both surfaces of a flexible portion according to an embodiment of the present invention.

[0031] Figure 3C It is a cross-sectional schematic diagram when a shock compensation pattern portion is formed on one surface of a planar portion and a flexible portion according to an embodiment of the present invention.

[0032] Figure 3D It is a cross-sectional view schematically showing a case where a shock compensation pattern portion is formed on both surfaces of a planar portion and a flexible portion according to an embodiment of the present invention.

[0033] Figure 4A It is a cross-sectional schematic diagram when a shock compensation pattern portion is formed on one side of a flexible portion according to another embodiment of the present invention.

[0034] Figure 4BIt is a cross-sectional schematic diagram when the impact compensation pattern parts are formed on both sides of the flexible part according to another embodiment of the present invention.

[0035] Figure 5A It is a cross-sectional schematic diagram when a shock compensation pattern portion is formed on one side of a flexible portion according to another embodiment of the present invention.

[0036] Figure 5B It is a cross-sectional schematic diagram when the impact compensation pattern parts are formed on both sides of the flexible part according to another embodiment of the present invention.

[0037] Fig. 6A It is a cross-sectional schematic diagram when a shock compensation pattern portion is formed on one surface of a planar portion and a flexible portion according to another embodiment of the present invention.

[0038] Figure 6B It is a cross-sectional schematic diagram when a shock compensation pattern portion is formed on one surface of a planar portion and a flexible portion according to another embodiment of the present invention.

[0039] Figures 7 to 9 It is a schematic diagram showing a method for manufacturing a rollable, slidable and stretchable cover window according to various embodiments of the present invention.

[0040] Fig.10 It is a cross-sectional schematic diagram of a rollable, slidable and stretchable cover window involved in various embodiments of the present invention.

[0041] Fig.11 It is a cross-sectional schematic diagram of a rollable, slidable and stretchable cover window involved in various embodiments of the present invention.

[0042] Fig. 12A It is a cross-sectional schematic diagram of a rollable, slidable and stretchable cover window involved in various embodiments of the present invention.

[0043] Fig. 12B It is a cross-sectional schematic diagram of a rollable, slidable and stretchable cover window involved in various embodiments of the present invention.

[0044] Fig.13A It is a cross-sectional schematic diagram of a rollable, slidable and stretchable cover window involved in various embodiments of the present invention.

[0045] Fig. 13B It is a cross-sectional schematic diagram of a rollable, slidable and stretchable cover window involved in various embodiments of the present invention.

[0046] Fig.14 It is a cross-sectional schematic diagram of a slidable cover window involved in one embodiment of the present invention.

[0047] Fig.15 It is a cross-sectional schematic diagram of a slidable cover window involved in one embodiment of the present invention.

[0048] Fig.16 To express Fig.15 FIG. 1 is a diagram showing a front view of a slidable cover window according to an embodiment of the present invention.

[0049] Fig.17 To express Fig.15 FIG. 1 is a diagram showing a cross-sectional image of a slidable cover window according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The present invention relates to a rollable, slidable and stretchable cover window, and more particularly to a rollable, slidable and stretchable cover window and a manufacturing method thereof, wherein a pattern portion for impact compensation is formed on a glass substrate to disperse impact force, improve impact resistance, and ensure strength characteristics and folding characteristics.

[0051] That is, by forming an impact compensation pattern portion on the glass substrate, the transfer of in-plane cracks (Crack) in the flexible area is prevented, the stress is dispersed, and the impact is dispersed between the patterns when the pen is dropped, increasing the rigidity against the pen drop, thereby improving the strength characteristics and folding characteristics at the same time.

[0052] In addition, by forming an impact compensation pattern portion on the glass substrate, surface scratches or microcracks formed on the surface of the above-mentioned glass substrate can be removed. By removing and reducing appearance defects, not only the strength characteristics and folding characteristics are improved, but also the yield is improved.

[0053] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Figure 2 is a schematic diagram of a pattern portion for impact compensation according to an embodiment of the present invention, Figure 3A is a cross-sectional schematic diagram of a case where a pattern portion for impact compensation is formed on one side of a flexible portion according to an embodiment of the present invention, Figure 3B FIG. 2 is a cross-sectional view showing a case where a pattern portion for impact compensation is formed on both sides of a flexible portion according to an embodiment of the present invention. Figure 3C FIG. 2 is a cross-sectional view showing a case where a pattern portion for impact compensation is formed on one side of a planar portion and a flexible portion according to an embodiment of the present invention. Figure 3D FIG. 2 is a cross-sectional view showing a case where a pattern portion for impact compensation is formed on both surfaces of a planar portion and a flexible portion according to an embodiment of the present invention. Figure 4A FIG. 2 is a cross-sectional schematic diagram of a case where a pattern portion for impact compensation is formed on one side of a flexible portion according to another embodiment of the present invention. Figure 4B FIG. 2 is a cross-sectional view showing a case where a pattern portion for impact compensation is formed on both sides of a flexible portion according to another embodiment of the present invention. Figure 5A FIG. 2 is a cross-sectional schematic diagram of a case where a pattern portion for impact compensation is formed on one side of a flexible portion according to another embodiment of the present invention. Figure 5BFIG. 2 is a cross-sectional view showing a case where a pattern portion for impact compensation is formed on both sides of a flexible portion according to another embodiment of the present invention. Fig. 6A FIG. 2 is a cross-sectional view showing a case where a pattern portion for impact compensation is formed on one side of a planar portion and a flexible portion according to another embodiment of the present invention. Figure 6B FIG. 2 is a cross-sectional view showing a case where a pattern portion for impact compensation is formed on one side of a planar portion and a flexible portion according to another embodiment of the present invention. Figures 7 to 9 Schematic diagram showing a method for manufacturing a rollable, slidable and stretchable cover window according to various embodiments of the present invention. Fig.10 Schematic cross-sectional view of a rollable, slidable and stretchable cover window according to various embodiments of the present invention. Fig.11 Schematic cross-sectional view of a rollable, slidable and stretchable cover window according to various embodiments of the present invention. Fig. 12A Schematic cross-sectional view of a rollable, slidable and stretchable cover window according to various embodiments of the present invention. Fig. 12B Schematic cross-sectional view of a rollable, slidable and stretchable cover window according to various embodiments of the present invention. Fig.13A Schematic cross-sectional view of a rollable, slidable and stretchable cover window according to various embodiments of the present invention. Fig. 13B Schematic cross-sectional view of a rollable, slidable and stretchable cover window according to various embodiments of the present invention. Fig.14 is a cross-sectional schematic diagram of a slidable cover window according to an embodiment of the present invention, Fig.15 is a cross-sectional schematic diagram of a slidable cover window according to an embodiment of the present invention, Fig.16 To express Fig.15 FIG. 1 is a diagram showing a front view of a slidable cover window according to an embodiment of the present invention, Fig.17 To express Fig.15 FIG. 1 is a diagram showing a cross-sectional image of a slidable cover window according to an embodiment of the present invention.

[0054] As shown in the figure, the rollable, slidable and stretchable cover window 100 involved in the present invention includes a planar portion P formed corresponding to the planar area of ​​the rollable, slidable and stretchable display, and a flexible portion F formed to be connected to the above-mentioned planar portion P and corresponding to the flexible area of ​​the above-mentioned rollable, slidable and stretchable display, and is characterized in that the above-mentioned flexible portion F or the above-mentioned planar portion P and the flexible portion F include an impact compensation pattern portion 122, and the above-mentioned impact compensation pattern portion 122 is composed of a concave-convex pattern.

[0055] In the present invention, the flexible area of ​​the display refers to the rolled part, the pushed-pull part, and the stretched part when the display is bent, rolled (Rollable), slidable (Slidable) or stretched (Stretchable). The part of the cover window corresponding to the above-mentioned area is referred to as the "flexible part" F of the cover window 100 in the present invention, and the planar area other than the flexible part F is referred to as the "planar part" P of the cover window 100.

[0056] In particular, the present invention is formed of a glass substrate, and the planar portion P and the flexible portion F can be formed with uniform thickness as a whole, or the flexible portion F can be thinned (slimming) to be thinner than the planar portion P.

[0057] When the flexible portion F is thinned (Slimming) and is thinner than the planar portion P, generally, the planar portion P of the cover window 100 has a thickness of 50 to 300 μm, and the flexible portion F has a thickness of about 10 to 150 μm. The flexible portion F is formed by processing a very thin sheet glass.

[0058] Among them, the length of the above-mentioned flexible part F is designed considering the curvature radius of the part of the cover window 100 that undergoes pushing, pulling or curling in response to the deformation of the display panel, and is roughly set to the curvature radius xπ. The thickness of the cover window 100 in the above-mentioned flexible part F is formed to be 10 to 150 μm.

[0059] If the depth of the flexible portion F is too deep, that is, the flexible area of ​​the cover window 100 is too thin, although the foldability is good, wrinkles will be generated during reinforcement or it will be detrimental to the strength. If it is too thick, the softness, restoring force and elastic force of the flexible area will decrease, thereby reducing the folding characteristics. Therefore, the thickness of the flexible portion F of the cover window 100 is more preferably about 10 to 150 μm.

[0060] In the present invention, the cover window 100 is formed of a glass substrate with a thickness of about 50 to 300 μm, and is used after being subjected to a chemical strengthening treatment. At this thickness, the width and depth of the flexible portion F are appropriately designed as described above. If it is thinner than the above thickness, the thickness of the flexible region of the cover window 100 becomes too thin after the flexible portion F is formed, and the above problems occur. Even if it is thicker than the above thickness, the glass substrate causes a decrease in softness, resilience, and elasticity, which affects the lightweighting of the display product.

[0061] As an embodiment of the present invention, the flexible portion F may be in a form of being thinned inward at the flexible area of ​​the cover window 100 to form a four-corner trench shape as a whole. An inclined portion 124 whose thickness gradually becomes thicker starting from the flexible portion F may be formed on one side or both sides of the flexible portion F and connected to the planar area of ​​the cover window 100.

[0062] In particular, an inclined portion 124 with a small slope is formed at one side end of the flexible portion F (the boundary with the plane portion P), so that the reflection angle based on the reflection surface can be adjusted to be similar in the entire area of ​​the flexible portion F, thereby minimizing light interference and visual confirmation at the reflection surface.

[0063] Since the present invention maintains folding characteristics and strength characteristics, it can be formed on the entire surface of a display panel to be used for protecting the display panel, and can be arranged on a CPI (Clear Polyimide) cover to be used as a CPI cover for protection.

[0064] As such, the present invention provides a rollable, slidable and stretchable cover window 100 formed by a glass substrate and having a flexible portion F that has enhanced strength and folding properties despite being a thin plate in order to be applicable to a rollable, slidable and stretchable display, characterized in that a pattern portion 122 for impact compensation is provided in the above-mentioned flexible portion F or in the above-mentioned planar portion P and the flexible portion F respectively.

[0065] For this reason, Figures 2 to 6B As shown, the present invention includes a shock compensation pattern portion 122 on the glass substrate 110 , and is characterized in that the shock compensation pattern portion 122 is composed of a concavo-convex pattern.

[0066] The impact compensation pattern portion 122 may be formed on the surface where the flexible portion F is formed, that is, one or both surfaces of the cover window 100 , and may be formed not only on the flexible portion F but also on the plane portion P, that is, on the entire surface (Total Surface) of the glass substrate 110 .

[0067] The impact compensation pattern portion 122 is formed by continuously forming patterns of the same or different sizes in a regular or irregular manner on the glass substrate 110 by dry or wet etching, and is formed into a concavo-convex pattern.

[0068] In particular, the horizontal cross-sectional shape of the impact compensation pattern portion may be any one or more of polygonal, elliptical and circular shapes or a combination thereof, and may be arranged in a grid or cross pattern in order to improve folding characteristics and evenly disperse impact force.

[0069] That is, in the process of performing thinning and etching to form the flexible portion F in order to enhance the folding property of the cover window 100, a predetermined pattern is formed inside the flexible portion F, or a predetermined pattern is formed on the planar portion P and the flexible portion F through a predetermined patterning process.

[0070] Figure 2 Schematic diagram showing an impact compensation pattern portion according to an embodiment of the present invention, wherein the cross-sectional shape is a trapezoidal shape, and the corners of the pattern are formed to be inclined.

[0071] The pattern of the impact compensation pattern portion according to the present invention is formed in a concavo-convex shape, and the corners are inclined at a certain angle, thereby minimizing light reflection at the mirror surface formed by the pattern and minimizing visual visibility of the pattern.

[0072] Generally, when a glass material is used to form a rollable, slidable and stretchable cover window 100 , the thickness of the glass substrate 110 should be thin, and in order to ensure the strength characteristics, the thickness should be above a certain level.

[0073] As described above, when a glass substrate is intended to be used as a rollable, slidable, or stretchable cover window, it is necessary to measure the folding characteristics of the entire area (40 to 60% of the total area) rolled into the hinge during sliding or rolling.

[0074] For example, for a sliding cover window, when the length of the sliding part is assumed to be 100 mm based on the 5R standard, the expected yield is 0.9^(100 / (5*π))=0.509, which is approximately 50%, and when the length of the sliding part is assumed to be 100 mm based on the 2R standard, the expected yield is 0.9^(100 / (2*π))=0.187, which is approximately 19%.

[0075] The cause of this folding failure is judged to be: inherent defects (Inherent Defect (Compositional: compositional unevenness, Physical defect)) of the glass substrate itself and physical defects (Physical Defect) generated during the processing process.

[0076] When the present invention intends to use the rollable, slidable and stretchable cover window 100 as a glass substrate 110, an impact compensation pattern portion 122 is formed on the glass substrate 110 in order to eliminate the inherent defects of the glass substrate 110 itself and the physical defects in the processing steps as mentioned above.

[0077] Although the conventional folding characteristic yield is only less than 50% as described above, as shown in the rollable, slidable and stretchable cover window 100 of the present invention, by forming an impact compensation pattern portion 122 on one or both sides of the glass substrate 110, the yield of the present invention is guaranteed to be 100%, which has the effect of significantly improving productivity.

[0078] like FIG. 3A to FIG. 3D As shown, the impact compensation pattern portion 122 can be formed on one side of the flexible portion F ( Figure 3A ) or both sides ( Figure 3B ), it can also be formed on one side of the planar portion P and the flexible portion F ( Figure 3C ) or both sides ( Figure 3D ).

[0079] Therefore, through the impact compensation pattern portion 122 on one or both sides of the glass substrate 110, the stress on the inherent defects and physical defects is dispersed, the strength characteristics and folding characteristics are improved, and in particular, an unprecedented result of 100% guaranteed folding yield is achieved.

[0080] In addition, the thickness of the cover window 100 of the present invention can be formed to be less than 200μm, preferably 20 to 100μm. At this time, when the top (front) of the above-mentioned glass substrate 110 is impacted by an object with a narrow cross-sectional area such as a pen-drop, the entire glass substrate 110 may be deformed and damaged centered on the pen-drop contact portion.

[0081] In particular, in the case of a cover window 100 having a thinned flexible area, since the thickness of this part is particularly thin, not only is the pen-holding characteristic very fragile, but a stress difference is also generated due to the thickness difference between the flexible area and the flat area, resulting in problems such as the waviness of the glass substrate 110, and there is a disadvantage that the impact resistance is very fragile.

[0082] In order to improve the impact resistance by improving the writing characteristics of the above-mentioned flexible portion F, and at the same time to improve the folding characteristics and strength characteristics, the present invention forms an impact compensation pattern portion 122 on one side or both sides of the glass substrate 110. In particular, it can be formed only on the flexible portion F. However, according to product specifications, the impact compensation pattern portion 122 can also be formed on both the planar portion P and the flexible portion F.

[0083] In particular, the impact compensation pattern portion 122 may be formed in a form in which the pattern is dispersed as a whole rather than in the conventional stripe form, and preferably has a horizontal cross-sectional shape formed in any one or more of a polygon, an ellipse, and a circle, or a combination thereof. This may be formed simultaneously when etching the flexible portion F, or may be formed on the planar portion P and the flexible portion F through a patterning process.

[0084] Generally, when an impact such as a pen dropping is applied to the cover window 100, the impact force transmitted in the vertical direction will be stronger than the impact force transmitted in the horizontal direction. Since the impact compensation pattern portion 122 involved in the present invention is composed of a plurality of concave and convex patterns, it can effectively disperse or support the vertical impact force and significantly improve the pen dropping characteristics.

[0085] That is, the impact force of the pen is transmitted to the inside of the glass substrate 110 and collides with or is absorbed by the pattern of the impact compensation pattern part 122, thereby effectively dispersing or absorbing the impact force. In addition, since the transparent resin material 130 is filled between the patterns described later, the absorption and support effects of the impact force are significantly improved.

[0086] In addition, the present invention forms an impact compensation pattern portion 122 on the thin flexible portion F, which can eliminate the stress difference caused by the thickness difference with the planar portion P, thereby improving impact resistance and minimizing image distortion or resolution reduction, thereby providing a high-quality rollable, slidable and stretchable display.

[0087] Generally speaking, the back side of the glass substrate 110 (the side opposite to the side where the impact is applied) is more susceptible to the impact of the pen. Therefore, as an embodiment of the present invention, Figure 3A , Figure 3C , Figure 4A , Figure 5A , Fig. 6A , Figure 6B As shown, the impact compensation pattern portion 122 according to the present invention may be formed on the rear surface (lower side in the figure) of the glass substrate 110 .

[0088] Thus, the impact force transmitted from the front surface (touch surface) of the glass substrate 110 is transmitted to the inside of the glass substrate 110 , and the impact force is dispersed or absorbed by the impact compensation pattern portion 122 composed of the cylindrical pattern.

[0089] In addition, if Figure 3B , Figure 3D , Figure 4B , Figure 5B As shown, the impact compensation pattern portion 122 may also be formed on both surfaces of the glass substrate 110, i.e., the front and the back. This may also allow the impact compensation pattern portion 122 formed on the surface including the impacted contact portion, i.e., the front, to absorb the impact force for the first time, and the impact force transmitted to the interior of the glass substrate 110 is absorbed by the impact compensation pattern portion 122 formed on the back.

[0090] Among them, the impact compensation pattern portion 122 formed on the above-mentioned front flexible portion F and the impact compensation pattern portion 122 formed on the rear flexible portion F can form the same or different pattern sizes, intervals between patterns, pattern heights, etc. according to product specifications, uses, etc.

[0091] Furthermore, the height of the impact compensation pattern portion 122 of the present invention is preferably formed to be less than half of the thickness of the glass substrate 110 , and more preferably formed to be in the range of 10 to 30% of the thickness of the glass substrate 110 .

[0092] If the height is lower than the above range, the impact force dispersion effect is not significant, and if it is higher than the above range, the overall strength characteristics are reduced due to the reduction in effective thickness.

[0093] The impact compensation pattern portion 122 according to an embodiment of the present invention is characterized in that the width a of the upper end of the pattern is 0 to 1000 μm, the width b of the lower end of the pattern is 30 to 2000 μm, and the interval c between the patterns is 30 to 4000 μm.

[0094] If the size of the above-mentioned pattern is larger than the above-mentioned range, the folding characteristics are reduced, and if it is smaller than the above-mentioned range, the pen-falling characteristics are reduced. If the interval between the above-mentioned patterns is larger than the above-mentioned range, the pen-falling characteristics are reduced, and if the interval between the above-mentioned patterns is smaller than the above-mentioned range, the folding characteristics are reduced.

[0095] In addition, the height d (etching depth) of the pattern of the impact compensation pattern portion is preferably 0.0005 to 0.28 mm. In addition, the slope θ of the side surface of the pattern of the impact compensation pattern portion is formed at a slope of 0.1 to 50° relative to the horizontal plane of the cover window. This depends on the etching process conditions of the impact compensation pattern portion, and the height and slope of the pattern to be formed are adjusted according to product specifications, etc.

[0096] If the height of the pattern is smaller than the height described above, the impact absorption and dispersion functions are not significant, and if the height of the pattern is larger than the height described above, light reflection may occur on the mirror surface of the pattern, or the intensity characteristics may decrease.

[0097] If the slope is smaller than the above, the height of the pattern is too small, resulting in poor impact absorption and dispersion functions. If the slope is larger than the above, the probability of light reflection on the mirror surface of the pattern increases.

[0098] In addition, the height of the impact compensation pattern portion 122 is preferably formed to be equal to or smaller than the depth of the flexible portion F.

[0099] This is to improve the folding characteristics. When the height of the impact compensation pattern portion 122 is the same as the depth of the flexible portion F, the etching process described later is performed once. When the height of the impact compensation pattern portion 122 is smaller than the depth of the flexible portion F, the etching process described later is performed more than twice.

[0100] Figure 3A to Figure 3D as well as Figure 4A , Figure 4B The figure shows the case where the height of the impact compensation pattern portion 122 is the same as the depth of the flexible portion F. Figure 5A , Figure 5B as well as Fig. 6A , Figure 6B The case where the height of the impact compensation pattern portion 122 is smaller than the depth of the flexible portion F is shown.

[0101] Figure 3A to Figure 3D In the case where the height of the impact compensation pattern portion 122 is the same as the depth of the flexible portion F, Figure 3A FIG. 1 shows a case where the impact compensation pattern portion 122 is formed only on one side of the flexible portion F. Figure 3B The impact compensation pattern portion 122 is shown to be formed on both sides of the flexible portion F. Figure 3C FIG. 1 shows a case where the impact compensation pattern portion 122 is formed on one side of the planar portion P and the flexible portion F. Figure 3D The case where the impact compensation pattern portion 122 is formed on both surfaces of the planar portion P and the flexible portion F is shown.

[0102] Figure 4A , Figure 4B The case where the height of the impact compensation pattern portion 122 is the same as the depth of the flexible portion F is shown, and the flexible portion F forms an inclined portion 124 at the boundary with the planar portion P. Figure 4A FIG. 2 shows a case where the impact compensation pattern portion 122 is formed on one side of the flexible portion F. Figure 4B The case where such impact compensation pattern portion 122 is formed on both surfaces of the flexible portion F is shown.

[0103] Figure 5A , Figure 5B The case where the height of the impact compensation pattern portion 122 is smaller than the depth of the flexible portion F is shown, and the flexible portion F forms an inclined portion 124 at the boundary with the planar portion P. Figure 5A FIG. 2 shows a case where the impact compensation pattern portion 122 is formed on one side of the flexible portion F. Figure 5B The case where such impact compensation pattern portion 122 is formed on both surfaces of the flexible portion F is shown.

[0104] Fig. 6A , Figure 6B The case where the height of the impact compensation pattern portion 122 is smaller than the depth of the flexible portion F is shown, and the flexible portion F forms an inclined portion 124 at the boundary with the planar portion P. Fig. 6A FIG. 2 shows a case where the impact compensation pattern portion 122 is formed on one side of the planar portion P and the flexible portion F. Figure 6B The case where the impact compensation pattern portion 122 is also formed on the inclined portion 124 of the flexible portion F is shown.

[0105] Right now, Figure 6B This is a case where the impact compensation pattern portion 122 is formed on the entire surface of the cover window.

[0106] The impact compensation pattern portion 122 may be formed by a dry or wet etching process. As one embodiment of the present invention, the pattern portion 122 may be formed by an etching process using a photo mask.

[0107] Hereinafter, as one embodiment of the present invention, a manufacturing method in which the shock compensation pattern portion 122 is formed only in the flexible region will be described.

[0108] The impact compensation pattern portion 122 according to an embodiment of the present invention is formed by a wet etching process using a photomask, such as Figures 7 to 9 As shown, it is formed by the following process: a first step of forming an anti-etching layer on the above-mentioned glass substrate 110; a second step of patterning the above-mentioned anti-etching layer to form an anti-etching pattern layer for forming a flexible part F including the impact compensation pattern part 122 on the above-mentioned glass substrate 110; a third step of using the above-mentioned anti-etching pattern layer as a mask to form the flexible part F including the impact compensation pattern part 122 between the above-mentioned planar part P; and a fourth step of removing the above-mentioned anti-etching pattern layer.

[0109] Thereafter, a fifth step of strengthening the glass substrate 110 on which the flexible portion F including the shock compensation pattern portion 122 is formed is performed to complete the cover window 100 on which the flexible portion F including the shock compensation pattern portion 122 is formed.

[0110] In order to form the flexible portion F including the above-mentioned impact compensation pattern portion 122, first, a photoresist is coated on the above-mentioned glass substrate 110 or DFR (Dry Film Resist) is adhered to form a resist layer, and a patterning process of exposure and development is performed using a photomask having a pattern corresponding to the above-mentioned resist pattern layer to form a resist pattern layer on the above-mentioned glass substrate 110 for forming the flexible portion F including the above-mentioned impact compensation pattern portion 122.

[0111] Among them, the above-mentioned anti-etching pattern layer can be formed as a compensation pattern layer for forming the above-mentioned impact compensation pattern portion 122, or formed as a compensation pattern layer for forming the above-mentioned impact compensation pattern portion 122, and a gradient pattern layer (Gradation pattern) for forming an inclined portion 124 on both sides of the above-mentioned pattern and between the above-mentioned planar portion P and the flexible portion F.

[0112] As shown in the figure, the side shape of the flexible portion F involved in the present invention can be formed into a vertical groove shape, or as 4A to 6B As shown, in order to improve the visibility of the boundary portion, an inclined portion 124 is formed between the flexible portion F.

[0113] When the flexible portion F is formed into a vertical trench shape, the anti-etching pattern layer is formed as a compensation pattern layer for forming the impact compensation pattern portion 122, and when the inclined portion 124 is formed between the planar portion P and the flexible portion F, in addition to forming the compensation pattern layer for forming the impact compensation pattern portion 122, a gradient pattern layer can be formed on both sides of the compensation pattern layer.

[0114] The compensation pattern layer is formed into a predetermined pattern for forming an impact compensation pattern portion, and the gradient pattern layer is formed into a pattern whose aperture ratio decreases from the flexible portion F toward the planar portion P according to an embodiment of the present invention, and is formed corresponding to the region where the inclined portion 124 is formed.

[0115] Depending on process conditions, instead of the gradient pattern layer, a small space may be provided between the DFR at the boundary of the flexible portion F and the glass substrate 110 to form the inclined portion 124 by utilizing the penetration of etching solution.

[0116] Then, an etching process is performed using the resist pattern layer as a mask, so that the flexible portion F including the impact compensation pattern portion 122 is formed between the flat portion P and the flat portion.

[0117] In order to form a flexible part F including the above-mentioned impact compensation pattern part 122, the processes of the first step to the fourth step are performed, and the shape or size (size, spacing), etc. are adjusted to match the product specifications or uses by adjusting the process conditions or the number of processes, so as to form a flexible part F including the impact compensation pattern part 122.

[0118] Preferably Figure 7 as well as Figure 8 As shown, by performing the first to fourth steps once, the height h2 of the pattern of the impact compensation pattern portion 122 and the depth h1 of the flexible portion F are formed to be the same, or as shown in FIG. Fig. 9As shown, by repeatedly performing the first to fourth steps twice or more, the height h2 of the pattern of the impact compensation pattern portion 122 is formed to be smaller than the depth h1 of the flexible portion F (h1>h2).

[0119] like Figure 7 As shown, a method for manufacturing a rollable, slidable and stretchable cover window 100 according to an embodiment of the present invention includes the following steps: forming an anti-etching layer on a glass substrate 110; patterning the anti-etching layer to form an anti-etching pattern layer for forming a flexible portion F including an impact compensation pattern portion 122 on the glass substrate 110; using the anti-etching pattern layer as a mask to form a flexible portion F including an impact compensation pattern portion 122 between the planar portion P and the anti-etching pattern layer; and strengthening the glass substrate 110 after removing the anti-etching pattern layer.

[0120] The resist pattern layer is formed as a compensation pattern layer having a predetermined pattern in order to form the flexible portion F including the impact compensation pattern portion 122 .

[0121] Thus, a rollable, slidable and stretchable cover window 100 is provided in which a flexible portion F including an impact compensation pattern portion 122 is formed between the plane portions P. According to the present embodiment, the shape of the flexible portion F is the same as that of the impact compensation pattern portion 122, the height h1 of the flexible portion F is the same as the height h2 of the pattern of the impact compensation pattern portion 122 (h1=h2), and the shape of the flexible portion F is close to a vertical trench shape.

[0122] In addition, if Figure 8 As shown, another embodiment of the present invention relates to a method for manufacturing a rollable, slidable and stretchable cover window 100 similar to the above-mentioned Figure 5A , Figure 5B The embodiments are similar.

[0123] In order to form the flexible portion F including the impact compensation pattern portion 122 , the resist pattern layer is formed as a compensation pattern layer having a predetermined pattern and a gradient pattern layer for forming the inclined portion 124 between the flexible portion F and the planar portion P.

[0124] Thus, a rollable, slidable and stretchable cover window 100 is provided in which the inclined portion 124 is formed at the boundary between the plane portion P and the flexible portion F, and the flexible portion F including the impact compensation pattern portion 122 formed of a cylindrical pattern is formed therebetween.

[0125] According to this embodiment, the shape of the above-mentioned flexible portion F includes a pattern portion 122 for impact compensation and inclined portions 124 on both sides thereof, a height h1 of the flexible portion F is the same as a height h2 of the pattern portion 122 for impact compensation (h1=h2), and the shape of the flexible portion F is close to a trapezoidal shape formed with the inclined portion 124.

[0126] In addition, if Fig. 9 As shown, another embodiment of the present invention relates to a method for manufacturing a rollable, slidable and stretchable cover window 100, which is similar to the above-mentioned Figure 7 as well as Figure 8 The present invention is an embodiment of the present invention, but is characterized in that a plurality of wet etching steps using a photomask are performed in order to form the flexible portion F including the impact compensation pattern portion 122.

[0127] As shown in the figure, a primary pattern for forming the impact compensation pattern portion 122 is formed by performing one etching process, and a secondary pattern for forming the impact compensation pattern portion 122 is formed by performing two etching processes.

[0128] Among them, the anti-etching pattern layer used to form the above-mentioned primary pattern is formed as a compensation pattern layer composed of a circular pattern in order to form a flexible part F including a cylindrical impact compensation pattern part 122, or is formed as a compensation pattern layer composed of the above-mentioned circular pattern and a gradient pattern layer for forming an inclined part 124 on both sides of the above-mentioned compensation pattern layer and between the above-mentioned planar part P and the flexible part F.

[0129] In addition, the anti-etching pattern layer used to form the above-mentioned secondary pattern is formed to make the above-mentioned impact compensation pattern portion 122 area (corresponding to the area of ​​the primary pattern) open, or to make the above-mentioned impact compensation pattern portion 122 area open, and its two side boundary portions are formed as a gradient pattern layer for forming the inclined portion 124.

[0130] The gradient pattern layer can be formed in any one or all of the primary etching process and the secondary etching process according to product specifications. As one embodiment of the present invention, an anti-etching pattern layer is formed in both the primary etching process and the secondary etching process.

[0131] Thus, the shape of the primary pattern is formed so that the height h1 of the flexible portion F is the same as the height h2 of the pattern of the impact compensation pattern portion 122, and the shape of the secondary pattern is formed so that the height h2 of the pattern of the impact compensation pattern portion 122 is lower than the height h1 of the entire flexible portion F (h1>h2).

[0132] This is because the resist pattern layer used to form the secondary pattern is formed with an opening in the region corresponding to the primary pattern, and etching is mainly performed in this region, so the height h2 of the impact compensation pattern portion 122 becomes lower than the height h1 of the flexible portion F (h1>h2).

[0133] The method is characterized in that the etching depth A based on the primary etching step is 0.0005 to 0.28 mm, and the etching depth B based on the secondary etching step is 0.01 to 0.2 mm.

[0134] By adjusting the etching depth in the primary etching process and the etching depth in the secondary etching process, the height of the pattern of the impact compensation pattern portion 122 at the flexible portion F can be controlled, thereby improving the pen-down property and the folding property.

[0135] If the difference between the etching depth by the primary etching step and the etching depth by the secondary etching step is too large, the strength characteristics are degraded, and if it is too small, there is no difference in the folding characteristics.

[0136] Therefore, according to this embodiment, the shape of the above-mentioned flexible portion F includes an impact compensation pattern portion 122 and inclined portions 124 on both sides thereof, and a height h2 of the pattern of the impact compensation pattern portion 122 is formed to be lower than a height h1 of the flexible portion F (h1>h2), so that the shape of the flexible portion F is close to a trapezoidal shape formed with the inclined portion 124, and a low-height impact compensation pattern portion 122 is formed in the center.

[0137] In this way, by forming a flexible portion F including an impact compensation pattern portion 122 composed of a specified concave-convex pattern on the glass substrate 110, vertical impact force such as a pen drop is supported and dispersed, and although the thickness of the glass substrate 110 as a whole is hardly reduced, the effective thickness is reduced, which helps to improve the impact resistance to pen drops, folding characteristics and overall strength increase characteristics.

[0138] The glass substrate 110 having the flexible portion F including the shock compensation pattern portion 122 formed of the concave-convex pattern is subjected to Figures 7 to 9 The strengthening process shown is generally achieved by a chemical strengthening process.

[0139] With respect to the cover window 100 having a thin flexible portion F, since the tensile stress (CT) values ​​of the planar portion P and the flexible portion F are different from each other during the chemical strengthening treatment, it is difficult to simultaneously satisfy the folding characteristics and strength characteristics of the planar portion P and the flexible portion F. Therefore, an additional chemical process (adjustment of the strengthening depth DOL) may be further performed on the planar portion P.

[0140] On the other hand, as an embodiment of the present invention, it is characterized in that according to Figure 5A In the embodiment, the impact compensation pattern portion 122 is formed on one side, that is, the back side, of the glass substrate 110, and as Fig.10 As shown, the impact compensation pattern portion 122 is filled with a transparent resin material 130 and is bonded to the entire surface (Total Surface) of the display panel without any empty space.

[0141] By filling the transparent resin material 130 between the cylindrical patterns of the impact compensation pattern portion 122, the cover window 100 is provided with a uniform thickness as a whole, and the impact force is absorbed. When it is bonded to the entire surface of the display panel, it is ensured that there is no empty space (air layer), thereby improving the confirmation and bonding properties.

[0142] As the transparent resin material 130, a transparent resin such as OCR (Optical Clear Resin) having a refractive index almost the same as that of glass (1.5) is used, for example, acrylic, epoxy, silicone, urethane, urethane composite, urethane acrylic composite, mixed sol-gel, siloxane, etc. According to the properties of the transparent resin material 130, they can be mixed into various combinations for use in strengthening strength and elasticity.

[0143] In addition, a transparent resin layer 140 can be formed on the transparent resin material 130 on the upper layer of the impact compensation pattern portion 122. The transparent resin material 130 and the transparent resin layer 140 can be continuously formed from the same material through the same process, or the transparent resin material 130 and the transparent resin layer 140 can be continuously formed from the same material or different materials through sequential processes.

[0144] That is, the transparent resin material 130 and the transparent resin layer 140 may be formed simultaneously in the same process, or may be formed in different processes or in another process as needed, and may be provided with special functionality and formed as a single layer or multiple layers.

[0145] The transparent resin layer 140 may be formed on the front side and the back side of the glass substrate 110, or may be formed on the entire surface (Total Surface) of the front side, the back side and the side surface of the glass substrate 110. The transparent resin layer 140 formed on the back side of the glass substrate 110 and the transparent resin layer 140 formed on the front side of the glass substrate 110 may be formed of the same material, or the transparent resin layer 140 formed on the back side of the glass substrate 110 may be formed of a relatively softer material than the transparent resin layer 140 formed on the front side of the glass substrate 110.

[0146] This is to maintain durability by forming the transparent resin layer 140 of a relatively hard material at a portion touched by a user.

[0147] Fig.11 In accordance with Fig.10 In the embodiment, an impact compensation pattern portion 122 is formed on the back of a glass substrate 110, and a transparent resin material 130 is filled in the impact compensation pattern portion 122, and then a transparent resin layer 140 is formed on the upper side of the transparent resin material 130 on the glass substrate 110, and a buffer resin layer 150 is formed in front of the glass substrate 110, and a cover glass substrate 160 is formed on the upper layer thereof.

[0148] That is, the buffer resin layer 150 is formed between the glass substrates 110 , and the shock compensation pattern portion 122 is formed on the glass substrate 110 on the rear side.

[0149] Thus, when an impact is applied to the front side, the impact force is primarily absorbed by the buffer resin layer 150 , and secondarily absorbed by the impact compensation pattern portion 122 .

[0150] At this time, the thickness of the entire cover glass substrate 160 and the glass substrate 110 can be formed to be thinner, thereby improving the impact resistance to pen dropping and increasing the folding characteristics and the overall strength.

[0151] FIG. 12 shows the Fig.10 In the embodiment of the glass substrate 110 ( Fig. 12A ) or the cover glass substrate 160 ( Fig. 12B ) is also formed on the front side of the image, and as described above, the transparent resin layer 140 formed on the front side is formed of a harder material than the transparent resin layer 140 formed on the rear side.

[0152] like Figures 10 to 12B As shown, the present invention is composed of a composite material of glass and resin material, so as to maximize the glass texture while enhancing the softness, resilience, elasticity and strength characteristics of the resin material.

[0153] In particular, as an embodiment of the present invention, by forming a flexible portion F including an impact compensation pattern portion 122 on the glass substrate 110, and forming the transparent resin material 130 and the transparent resin layer 140, the impact force of the pen falling is further dispersed or absorbed, thereby further improving the impact resistance.

[0154] In addition, the in-plane crack transfer in the flexible portion F is minimized to prevent the shape of the impact compensation pattern portion 122 from being confirmed from the outside, and the transparent resin material 130 is uniformly filled into the impact compensation pattern portion 122 to ensure the flatness of the portion in contact with the display panel.

[0155] In addition, the elastic force of the cover window 100 is enhanced on the surface in contact with the display panel to improve the impact resistance, thereby preventing the glass from shattering when it is broken.

[0156] On the other hand, Fig.13A , Fig. 13B As shown, in Fig. 12A , Fig. 12B In the embodiment, a functional coating 170 may be formed on one or both sides of the cover window 100. The functional coating 170 is formed of a transparent material like the transparent resin material 130, and is given functionality by synthesizing resins having various properties.

[0157] The functional coating 170 may be formed on the impact compensation pattern portion 122 when the transparent resin material 130 is filled or when the transparent resin layer 140 is formed on the entire surface of the glass substrate 110. The functional coating 170 may be formed by a known resin coating method such as spray coating, dip coating, or spin coating.

[0158] The functional coating 170 may be formed as a single layer or multiple layers. The functional coating 170 formed in front of the cover window 100 may be formed as a strength reinforcement layer, and the functional coating 170 formed behind the cover window 100 may be formed as an elasticity reinforcement layer.

[0159] That is, since the touch is performed on the front of the cover window 100 , the functional coating 170 with further enhanced strength is formed, and the functional coating 170 with enhanced elasticity is formed on the back of the cover window 100 in order to play a buffering role between the cover window 100 and the display panel.

[0160] For the strength-enhancing layer (Hard Coating) in front of the cover window 100, a resin with a relatively high hardness when hardened, such as a resin with a high content of acrylic or epoxy, is used, and for the elasticity-enhancing layer (Soft Coating) behind the cover window 100, a resin with a relatively high elasticity when hardened, such as a resin with a high content of silicone or urethane synthetic resin, is used. In addition, the content of organic and inorganic substances in the organic-inorganic hybrid sol-gel can be adjusted to enhance strength or elasticity before use.

[0161] In addition, when the functional coating layer 170 is formed in multiple layers, the functional coating layer 170 formed on the front surface of the cover window 100 is preferably formed of a material that becomes relatively harder toward the upper layer.

[0162] In addition, the functional coating 170, especially the functional coating 170 formed on the top layer, can be given AF (Anti Finger) or AR (Anti Reflective) function, which can be formed by synthesizing a resin having such function, or by forming various patterns such as moth eye patterns on the functional coating 170.

[0163] Thus, the cover window 100 according to the present invention is basically formed with a functional coating 170 to enhance the strength and elasticity associated with the use of the thin glass substrate 110 so as to protect the cover window 100 from external impact and pressure of a touch pen.

[0164] In addition, the functional coating 170 further prevents the transfer of in-plane cracks in the flexible region, and strengthens the elastic force of the cover window 100 on the surface in contact with the display panel to improve the impact resistance and play a scattering prevention function.

[0165] Fig.14 The cross-sectional view of the slidable cover window 100 according to an embodiment of the present invention is shown in FIG. Fig.10 The embodiment of the present invention forms the impact compensation pattern portion 122 on the flexible portion F, and forms a transparent resin material 130 and a transparent resin layer 140 thereon, indicating that the cover window 100 is slid.

[0166] Fig.15 The cross-sectional view of the slidable cover window 100 according to another embodiment of the present invention is shown in FIG. Figure 6B In the embodiment, an impact compensation pattern portion 122 is formed on the plane portion P and the flexible portion F, an impact compensation pattern portion is also formed on the inclined portion 124, and a transparent resin material 130 and a transparent resin layer 140 are formed thereon, indicating that the cover window 100 is slid.

[0167] Fig.16 express Fig.15 The front image of the slidable cover window involved in the embodiment has a uniform impact compensation pattern portion formed in the entire area of ​​the plane portion P and the flexible portion F including the inclined portion 124.

[0168] Fig.17 express Fig.15 The cross-sectional image of the slidable cover window according to the embodiment of the present invention shows that a uniform impact compensation pattern portion is formed in the entire area of ​​the plane portion P and the flexible portion F including the inclined portion 124.

[0169] According to the present invention Fig.10 In the embodiment, an impact compensation pattern portion (height 0.03mm, width 0.05mm at the upper end, width 0.1mm at the lower end, interval 0.15mm) is formed on the flexible portion behind a glass substrate (thickness 0.08t), the height of the flexible portion is set to 0.045mm, and after filling with an acrylic transparent resin material (thickness 0.01mm), an acrylic transparent resin layer (thickness 0.01mm) is formed on the upper layer to measure the folding characteristics and pen-falling characteristics.

[0170] As for the slidable cover window using the above-mentioned embodiment, the folding characteristics (folding limit evaluation based on the two-point bending method, 2R standard) were measured, and the yield was 100%, and there were no defective products.

[0171] Regarding the pen-dropping characteristics of the slidable cover window involved in the above-mentioned embodiment (the pen-dropping test uses a pen with a ball size of 0.5mm and a weight of 6.2g, and the pen is freely dropped from various heights on the front side of the above-mentioned glass substrate to measure the height at which the above-mentioned cover window is damaged), it can be confirmed that damage occurs after the pen is dropped at an average height of 8cm, which is significantly higher than the commercial level.

[0172] The rollable, slidable and stretchable cover window involved in the present invention includes an impact compensation pattern portion composed of a cylindrical pattern, which prevents the transfer of in-plane cracks, disperses stress, disperses the impact between patterns when the pen is impacted, increases the rigidity of the pen, and improves the strength characteristics and folding characteristics.

[0173] Thus, a rollable, slidable and stretchable cover window can be provided which can significantly improve product yield and productivity and reduce process unit cost.

Claims

1. A rollable, slidable and stretchable cover window, comprising: a plane portion formed corresponding to a plane area of ​​a rollable, slidable and stretchable display; and a flexible portion formed to be connected to the planar portion and corresponding to the flexible region of the rollable, slidable and stretchable display, It is characterized in that include: glass substrate; and The impact compensation pattern portion is formed on the glass substrate. The impact compensation pattern portion is formed on the flexible portion, or formed on the planar portion and the flexible portion, and is composed of a concave-convex pattern; In the above-mentioned impact compensation pattern portion, the height of the above-mentioned pattern is 0.0005-0.28 mm, the width of the upper end of the above-mentioned pattern is 0-1000 μm, the width of the lower end of the above-mentioned pattern is 30-2000 μm, and the interval between the above-mentioned patterns is 30-4000 μm; In the above-mentioned impact compensation pattern portion, The slope of the side surface of the pattern is 0.1 to 50 degrees relative to the horizontal plane of the cover window; The flexible portion has an inclined portion formed at a boundary with the planar portion, and the impact compensation pattern portion is formed on the inclined portion.

2. The rollable, slidable and stretchable cover window according to claim 1, characterized in that: The impact compensation pattern portion may have a horizontal cross-sectional shape that is one or more of a polygonal shape, an elliptical shape, and a circular shape, or a combination thereof.

3. The rollable, slidable and stretchable cover window according to claim 1, characterized in that: The shock compensation pattern portion is formed on one surface or both surfaces of the glass substrate.

4. The rollable, slidable and stretchable cover window according to claim 1, characterized in that: The height of the pattern of the impact compensation pattern portion formed in the flexible portion is formed to be smaller than the depth of the flexible portion.

5. The rollable, slidable and stretchable cover window according to claim 1, characterized in that: The impact compensation pattern portion is formed by an etching process.

6. The rollable, slidable and stretchable cover window according to claim 5, characterized in that: The etching process includes a primary etching process for forming a primary pattern on the entire surface of the glass substrate, and a secondary etching process for further etching the flexible region to form a secondary pattern. The impact compensation pattern portion formed on the flexible portion is formed as the secondary pattern. The impact compensation pattern portion formed on the planar portion is formed as the primary pattern.

7. The rollable, slidable and stretchable cover window according to claim 5, characterized in that: The etching process includes: a primary etching process of forming a primary pattern on the flexible portion; and a secondary etching process of etching the entire surface of the glass substrate to form a secondary pattern in the primary pattern area by further etching the primary pattern, and forming a tertiary pattern on the flat portion. The impact compensation pattern portion formed on the flexible portion is formed as the secondary pattern. The impact compensation pattern portion formed on the planar portion is formed as the third-order pattern.

8. The rollable, slidable and stretchable cover window according to claim 6 or 7, characterized in that: The etching depth based on the above-mentioned single etching step is 0.0005 to 0.28 mm.

9. The rollable, slidable and stretchable cover window according to claim 6 or 7, characterized in that: The etching depth in the above-mentioned secondary etching step is 0.01 to 0.2 mm.

10. The rollable, slidable and stretchable cover window according to claim 1, characterized in that: The patterns of the shock compensation pattern portion are formed in a regular or irregular manner to have the same size or different sizes.

11. The rollable, slidable and stretchable cover window according to claim 10, characterized in that: The shock compensation pattern portion is formed in a grid arrangement or a cross arrangement.

12. The rollable, slidable and stretchable cover window according to claim 11, characterized in that: The pattern density of the impact compensation pattern portion formed on the flexible portion is the same as the pattern density of the impact compensation pattern portion formed on the planar portion, or The pattern density of the impact compensation pattern portion formed on the flexible portion is relatively denser than the pattern density of the impact compensation pattern portion formed on the planar portion.

13. The rollable, slidable and stretchable cover window according to claim 1, characterized in that: The rollable, slidable and stretchable cover window has a buffer resin layer formed on the front side of the glass substrate having the impact compensation pattern portion formed thereon, and a cover glass substrate is formed on the buffer resin layer.

14. The rollable, slidable and stretchable cover window according to claim 13, characterized in that: The pattern of the impact compensation pattern portion is filled with a transparent resin material.

15. The rollable, slidable and stretchable cover window according to claim 14, characterized in that: A transparent resin layer is formed on the upper layer of the impact compensation pattern portion and on the transparent resin material. The transparent resin material and the transparent resin layer are continuously formed from the same material through the same process, or The transparent resin material and the transparent resin layer are formed continuously by the same material or different materials through sequential steps.

16. The rollable, slidable and stretchable cover window according to claim 15, characterized in that: The transparent resin layer is formed on the front side and the rear side of the glass substrate, or is formed on the entire front side, the rear side, and the side surfaces of the glass substrate.

17. The rollable, slidable and stretchable cover window according to claim 15, characterized in that: For the above-mentioned transparent resin layer, The transparent resin layer formed on the rear side of the glass substrate and the transparent resin layer formed on the front side of the glass substrate are formed of the same material, or The transparent resin layer formed on the rear side of the glass substrate is formed of a relatively softer material than the transparent resin layer formed on the front side of the glass substrate.

18. The rollable, slidable and stretchable cover window according to claim 1, characterized in that: The flexible portion is formed to be thinner than the planar portion.

19. A method for manufacturing a rollable, slidable and stretchable cover window, the rollable, slidable and stretchable cover window comprising: a plane portion formed corresponding to a plane area of ​​a rollable, slidable and stretchable display; and a flexible portion formed to be connected to the planar portion and formed corresponding to the flexible region of the rollable, slidable and stretchable display, It is characterized in that The method for manufacturing the rollable, slidable and stretchable cover window comprises the following steps of forming a pattern portion for impact compensation on the flexible portion and the plane portion, wherein the height of the pattern is 0.0005 to 0.28 mm, the width of the upper end of the pattern is 0 to 1000 μm, the width of the lower end of the pattern is 30 to 2000 μm, and the interval between the patterns is 30 to 4000 μm: The first step is to form a resist layer on a glass substrate; The second step is to pattern the above-mentioned resist layer to form a resist pattern layer for forming a first pattern on the entire surface or the flexible area of ​​the above-mentioned glass substrate; The third step is to use the resist pattern layer of the second step as a mask, form a first pattern on the entire surface or the flexible area of ​​the glass substrate through a single etching process, and remove the resist pattern layer; The fourth step is to form an anti-etching layer on the glass substrate on which the first pattern is formed; The fifth step is to pattern the resist layer to form a resist pattern layer for forming a second pattern in the flexible region, or to form a resist pattern layer for forming the second pattern in the flexible region and for forming a third pattern in the planar region; A sixth step, using the resist pattern layer of the fifth step as a mask, further etching the flexible region through a secondary etching process to form a second pattern in the flexible region, or etching the entire surface of the glass substrate through a secondary etching process to form a second pattern in the flexible region and a third pattern in the planar region, and removing the resist pattern layer; and Step seven, strengthening the glass substrate; In the above-mentioned impact compensation pattern portion, The slope of the side surface of the pattern is 0.1 to 50 degrees relative to the horizontal plane of the cover window; The flexible portion has an inclined portion formed at a boundary with the planar portion, and the impact compensation pattern portion is formed on the inclined portion.

20. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 19, characterized in that: The impact compensation pattern portion may have a horizontal cross-sectional shape that is one or more of a polygonal shape, an elliptical shape, and a circular shape, or a combination thereof.

21. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 19, characterized in that: The above-mentioned resist pattern layer is formed as a compensation pattern layer for forming the above-mentioned first pattern, second pattern and third pattern, or A compensation pattern layer is formed for forming the first pattern, the second pattern and the third pattern, and a gradient pattern layer is formed for forming an inclined portion at a boundary portion of the first pattern and at a boundary portion between the second pattern and the third pattern.

22. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 19, characterized in that: The shock compensation pattern portion is formed on one surface or both surfaces of the glass substrate.

23. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 19, characterized in that: The etching depth based on the above-mentioned single etching step is 0.0005 to 0.28 mm.

24. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 19, characterized in that: The etching depth in the above-mentioned secondary etching step is 0.01 to 0.2 mm.

25. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 19, characterized in that: The patterns of the shock compensation pattern portion are formed in a regular or irregular manner to have the same size or different sizes.

26. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 25, characterized in that: The shock compensation pattern portion is formed in a grid arrangement or a cross arrangement.

27. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 26, characterized in that: The pattern density of the impact compensation pattern portion formed on the flexible portion is the same as the pattern density of the impact compensation pattern portion formed on the planar portion, or The pattern density of the impact compensation pattern portion formed on the flexible portion is relatively denser than the pattern density of the impact compensation pattern portion formed on the planar portion.

28. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 19, characterized in that: The rollable, slidable and stretchable cover window has a buffer resin layer formed on the front side of the glass substrate having the impact compensation pattern portion formed thereon, and a cover glass substrate is formed on the buffer resin layer.

29. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 28, characterized in that: The pattern of the impact compensation pattern portion is filled with a transparent resin material.

30. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 29, characterized in that: A transparent resin layer is formed on the upper layer of the impact compensation pattern portion and on the transparent resin material. The transparent resin material and the transparent resin layer are continuously formed from the same material through the same process, or The transparent resin material and the transparent resin layer are formed continuously by the same material or different materials through sequential steps.

31. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 30, characterized in that: The transparent resin layer is formed on the front side and the rear side of the glass substrate, or is formed on the entire front side, the rear side, and the side surfaces of the glass substrate.

32. The method for manufacturing a rollable, slidable and stretchable cover window according to claim 31, characterized in that: For the above-mentioned transparent resin layer, The transparent resin layer formed on the rear side of the glass substrate and the transparent resin layer formed on the front side of the glass substrate are formed of the same material, or The transparent resin layer formed on the rear side of the glass substrate is formed of a relatively softer material than the transparent resin layer formed on the front side of the glass substrate.

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