KR-20260062974-A - Foldable apparatus, ribbons, and methods of making

Abstract

A foldable device may include a foldable substrate comprising a substrate thickness and a central portion located between a first portion and a second portion. The central portion may include a central thickness less than the substrate thickness. A first maximum tensile stress in a first tensile stress region within the first portion and a second maximum tensile stress in a second tensile stress region within the second portion may be less than a third maximum tensile stress in a central tensile stress region within the central portion. A ribbon may include a ribbon thickness and a central portion located between a first portion and a second portion. The central portion may include a first central compressive stress region and a second central compressive stress region. In some embodiments, a method for processing the ribbon may include the steps of masking the first portion, masking the second portion, and chemically reinforcing the central portion.

Inventors

• 첸, 나이젱
• 펜튼, 매튜 웨이드
• 그로스, 티모시 마이클
• 진, 유휴
• 조시, 다난제이
• 쿠오, 콴-팅
• 카로쉬, 유세프 카예드

Assignees

• 코닝 인코포레이티드

Dates

Publication Date

20260507

Application Date

20200828

Priority Date

20190829

Claims (19)

1. As a foldable substrate, The above-mentioned foldable substrate can be folded around an axis extending in the width direction of the foldable substrate, and The above foldable substrate is: Glass-based material or ceramic-based material; A substrate thickness defined between a first main surface and a second main surface facing the first main surface; A first portion including a first tensile stress region including the above substrate thickness and a first maximum tensile stress; A second portion including a second tensile stress region including the substrate thickness and a second maximum tensile stress; and It further comprises a central portion including a first central surface region facing the second main surface and a central tensile stress region including a central maximum tensile stress, and A foldable substrate, wherein the central portion is located between a first portion and a second portion in the longitudinal direction of the foldable substrate perpendicular to the width direction of the foldable substrate, and the central portion includes a central thickness defined between a first central surface region and a second main surface, wherein the central thickness is less than the substrate thickness, the first maximum tensile stress is less than the central maximum tensile stress, and the second maximum tensile stress is less than the central maximum tensile stress.
2. In claim 1, A foldable substrate wherein the first maximum tensile stress is about 100 megapascals or less, the second maximum tensile stress is about 100 megapascals or less, and the center maximum tensile stress is in the range of about 125 megapascals to about 375 megapascals.
3. In claim 1, A foldable substrate, wherein the first maximum tensile stress is in the range of about 10 megapascals to about 100 megapascals, and the second maximum tensile stress is in the range of about 10 megapascals to about 100 megapascals.
4. In claim 1, A foldable substrate having a substrate thickness in the range of about 100 micrometers to about 2 millimeters.
5. In claim 4, A foldable substrate having a substrate thickness in the range of about 125 micrometers to about 200 micrometers.
6. In any one of claims 1 to 5, A foldable substrate having a center thickness in the range of about 25 micrometers to about 80 micrometers.
7. In any one of claims 1 to 5, A foldable substrate, wherein the center thickness is in the range of about 0.5% to about 13% of the substrate thickness.
8. In any one of claims 1 to 5, The above foldable substrate is a foldable substrate that achieves an effective bending radius of 10 millimeters.
9. In claim 8, A foldable substrate in which the width of the central portion is in the range of about 2.8 times the effective minimum bending radius to about 6 times the effective minimum bending radius.
10. In any one of claims 1 to 5, A foldable substrate having a central portion width in the range of about 2.8 millimeters to about 40 millimeters.
11. In any one of claims 1 to 5, The above-mentioned first portion further includes a first compressive stress region on a first main surface and a second compressive stress region on a second main surface, and the first tensile stress region is located between the first compressive stress region and the second compressive stress region; The second portion further includes a third compressive stress region on the first main surface and a fourth compressive stress region on the second main surface, and the second tensile stress region is located between the third compressive stress region and the fourth compressive stress region; A foldable substrate, wherein the central portion further comprises a first central compressive stress region in a first central surface region and a second central compressive stress region in a second main surface, and the central tensile stress region is located between the first central compressive stress region and the second central compressive stress region.
12. In claim 11, A foldable substrate, wherein the first compression depth of the first compression stress region is in the range of about 1% to about 10% of the substrate thickness, and the second compression depth of the second compression stress region is in the range of about 1% to about 10% of the substrate thickness.
13. In claim 11, A foldable substrate, wherein the third compression depth of the third compressive stress region is in the range of about 1% to about 10% of the substrate thickness, and the fourth compression depth of the fourth compressive stress region is in the range of about 1% to about 10% of the substrate thickness.
14. In claim 11, A foldable substrate, wherein the first central compression depth of the first central compression stress region is in the range of about 10% to about 30% of the central thickness, and the second central compression depth of the second central compression stress region is in the range of about 10% to about 30% of the central thickness.
15. In claim 14, A foldable substrate in which the first compression depth is substantially the same as the first center compression depth, and the third compression depth is substantially the same as the first center compression depth.
16. In claim 12, A foldable substrate in which the second compression depth is substantially the same as the second center compression depth, and the fourth compression depth is substantially the same as the second center compression depth.
17. In claim 11, A foldable substrate, wherein a first compressive stress region includes a first maximum compressive stress of about 700 megapascals or more, a second compressive stress region includes a second maximum compressive stress, a third compressive stress region includes a third maximum compressive stress of about 700 megapascals or more, a fourth compressive stress region includes a fourth maximum compressive stress, a first center compressive stress region includes a first center maximum compressive stress of about 700 megapascals or more, and a second center compressive stress region includes a second center maximum compressive stress.
18. As a foldable device, A foldable substrate according to any one of claims 1 to 5, comprising A foldable device in which a recess defined between a first central surface region of a central part and a first plane defined by a first main surface is filled with an adhesive, and the magnitude of the difference between the refractive index of the foldable substrate and the refractive index of the adhesive is about 0.1 or less.
19. As a consumer electronic product, Housing including front, rear and side; An electrical component that is at least partially located within a housing, said electrical component comprising a controller, memory, and a display, said display being located on the front of the housing or adjacent thereto; and A consumer electronic product comprising a cover substrate disposed on the display, wherein at least one of the parts of the cover substrate or the housing comprises a ribbon according to any one of claims 1 to 5.

Description

Foldable apparatus, ribbons, and methods of making This application claims priority to U.S. provisional patent application No. 62/914720 filed October 14, 2019, and U.S. provisional patent application No. 62/893306 filed August 29, 2019, the whole contents of which are incorporated herein by reference. The present disclosure generally relates to a foldable device, a ribbon, and a method for manufacturing the same, and more specifically to a foldable device and a ribbon comprising a foldable substrate including a compressive stress region, and a method for manufacturing the foldable device and the ribbon. Glass-based substrates (e.g., ribbons) are commonly used in display devices such as liquid crystal displays (LCDs), electrophoretic displays (EPDs), organic light-emitting diode displays (OLEDs), and plasma display panels (PDPs). There is a desire to develop foldable versions of displays as well as foldable protective covers for mounting on foldable displays. Foldable displays and covers must have excellent impact and puncture resistance. At the same time, foldable displays and covers must have a small minimum bending radius (e.g., about 10 millimeters (mm) or less). However, plastic displays and covers with a small minimum bending radius tend to have poor impact and/or puncture resistance. Furthermore, conventional wisdom holds that ultra-thin glass-based sheets with a small minimum bending radius (e.g., thickness of about 75 micrometers (μm or micron) or less) tend to have poor impact and/or puncture resistance. Moreover, thicker glass-based sheets with excellent impact and/or puncture resistance (e.g., greater than 125 micrometers) tend to have a relatively large minimum bending radius (e.g., about 30 millimeters or more). Therefore, it is necessary to develop a substrate for foldable devices that has a low minimum bending radius and excellent impact and puncture resistance. Furthermore, reinforced (e.g., chemical, thermal) ribbons (e.g., glass-based ribbons, ceramic-based ribbons) with a small minimum bending radius tend to have poor impact and/or puncture resistance. Moreover, unreinforced ribbons with excellent impact and/or puncture resistance tend to have a relatively large minimum bending radius (e.g., about 30 millimeters or more). Therefore, it is necessary to develop ribbons for foldable devices that have a low minimum bending radius and excellent impact and puncture resistance. The above and other features and advantages of the embodiments of the present disclosure are better understood when reading the following detailed description with reference to the accompanying drawings. FIG. 1 is a schematic diagram of an exemplary foldable device in a flat configuration according to some embodiments. FIGS. 2 and 3 are cross-sectional views of a foldable device along line 2-2 of FIG. 1 according to some embodiments. FIG. 4 is a plan view of an exemplary ribbon in a flat configuration according to some embodiments. FIG. 5 is a side view of a ribbon along line 5-5 of FIG. 4 according to some embodiments. FIGS. 6 and 7 are cross-sectional views of an exemplary foldable device including the ribbon of FIGS. 4 and 5. FIG. 8 is a schematic diagram of an exemplary foldable device in a folded configuration according to some embodiments. FIG. 9 is a cross-sectional view of an exemplary foldable device in a configuration folded along line 9-9 of FIG. 8 according to some embodiment. FIG. 10 is a schematic diagram of an exemplary foldable device of FIG. 4 and 5 in a folded configuration according to some embodiments. FIG. 11 is a cross-sectional view of an exemplary foldable device in a configuration folded along line 11-11 of FIG. 10 according to some embodiment. FIG. 12 is a cross-sectional view of an impact device for measuring a failure mode. FIG. 13 is a cross-sectional view of another exemplary foldable device in a configuration folded along line 9-9 of FIG. 8 according to some embodiment. Figure 14 shows the experimental results of a pen drop test of a glass-based substrate (e.g., ribbon) showing the maximum principal stress on the principal surface of the glass-based substrate as a function of the thickness of the glass-based substrate. FIG. 15 is a schematic perspective view of a pen drop device. FIGS. 16 to 29 schematically illustrate the steps of a method for manufacturing a foldable device (e.g., a foldable substrate, a ribbon). FIG. 30 is a flowchart illustrating exemplary methods for manufacturing a foldable device (e.g., a ribbon) according to an embodiment of the present disclosure. FIG. 31 is a schematic plan view of an exemplary consumer electronic device according to some embodiments. FIG. 32 is a schematic perspective view of an exemplary consumer electronic device of FIG. 31. Throughout the entire disclosure, drawings are used to highlight specific aspects. As such, the relative sizes of different regions, parts, and substrates depicted in the drawings should not be assumed to be proportional to