KR-102962718-B1 - FLEXIBLE DISPLAY DEVICE

Abstract

The present invention relates to a flexible display device, and more specifically, to a flexible display device comprising a display panel, a thin glass plate disposed on the display panel, and a cover member comprising an adhesive member disposed to surround the thin glass plate, wherein the adhesive member comprises a first adhesive member disposed to surround the upper surface and side surface of the thin glass plate and a second adhesive member disposed on the lower surface of the thin glass plate. The flexible display device according to the present invention provides the effect of effectively preventing shattering while improving surface hardness and indentation characteristics, and improving folding characteristics and impact resistance.

Inventors

• 이완수
• 박영주
• 황병하
• 곽태형
• 전창우

Assignees

• 엘지디스플레이 주식회사

Dates

Publication Date

20260507

Application Date

20210708

Claims (20)

1. A display panel divided into a display area and a non-display area surrounding the display area; and A cover member comprising a thin glass and an adhesive member disposed to surround the thin glass, disposed on the above-mentioned display panel, and The adhesive member comprises a first adhesive member disposed to surround the upper surface and side surface of the thin glass sheet and a second adhesive member disposed on the lower surface of the thin glass sheet. A flexible display device comprising a deco pattern disposed on the upper or lower part of the thin glass so as to overlap with the above non-display area.
2. In paragraph 1, A flexible display device in which the Young's modulus of the first adhesive member is the same as the Young's modulus of the second adhesive member.
3. In paragraph 2, A flexible display device in which the first adhesive member and the second adhesive member are formed of the same material.
4. In paragraph 1, A flexible display device in which the Young's modulus of the first adhesive member is different from the Young's modulus of the second adhesive member.
5. In paragraph 4, The flexible display device includes a folding area and non-folding areas on both sides of the folding area, The above folding area is inwardly folded so that the display surface of the flexible display device faces inward, and A flexible display device in which the Young's modulus of the first adhesive member is greater than the Young's modulus of the second adhesive member.
6. In paragraph 5, A flexible display device wherein the Young's modulus of the first adhesive member is 7,000 MPa to 10,000 MPa and the Young's modulus of the second adhesive member is 500 MPa to 3,000 MPa.
7. In paragraph 4, The flexible display device includes a folding area and non-folding areas on both sides of the folding area, The above folding area is outfolded so that the display surface of the flexible display device faces outward, and A flexible display device in which the Young's modulus of the first adhesive member is smaller than the Young's modulus of the second adhesive member.
8. In Paragraph 7, A flexible display device wherein the Young's modulus of the first adhesive member is 500 MPa to 3000 MPa, and the Young's modulus of the second adhesive member is 7000 MPa to 10000 MPa.
9. In paragraph 1, The above adhesive member is a flexible display device formed of an optical clear resin.
10. In paragraph 1, A flexible display device further comprising a protective film disposed on the above-mentioned cover member.
11. In Paragraph 10, A flexible display device in which the width and height of the cover member are each the same as the width and height of the protective film.
12. In Paragraph 10, A flexible display device, wherein the protective film is a plastic film comprising one or more selected from polyethylene terephthalate, polyethylene naphthalate, polyethylene, polymethyl methacrylate, polyimide, polyamideimide, polycarbonate, and cycloolefin (co)polymer.
13. In Paragraph 10, A flexible display device comprising a hard coating layer disposed on at least one surface of the protective film.
14. In Paragraph 13, A flexible display device comprising a hard coating layer disposed on the upper surface of the protective film and a second hard coating layer disposed on the lower surface of the protective film.
15. In Paragraph 14, A flexible display device comprising a first hard coating layer including an acrylic resin and a second hard coating layer including a silicone resin.
16. In paragraph 15, A flexible display device in which the above silicone-based resin is an epoxy-modified silicone resin.
17. In Paragraph 14, A flexible display device having a first hard coating layer with a thickness of 5㎛ to 20㎛ and a second hard coating layer with a thickness of 30㎛ to 60㎛.
18. In paragraph 1, A flexible display device in which the above deco pattern is arranged to be in contact with one side of the thin glass so as to overlap with the above non-display area.
19. In Paragraph 10, A flexible display device in which the above deco pattern is placed on the lower surface of the protective film to overlap with the above non-display area.
20. Display panel; A cover member disposed on the above-mentioned display panel and comprising a thin glass and an adhesive member disposed to surround the thin glass; A protective film disposed on the above-mentioned cover member; and It includes a first hard coating layer disposed on the upper surface of the protective film and a second hard coating layer disposed on the lower surface of the protective film, The adhesive member comprises a first adhesive member disposed to surround the upper surface and side surface of the thin glass sheet and a second adhesive member disposed on the lower surface of the thin glass sheet. A flexible display device having a first hard coating layer with a thickness of 5㎛ to 20㎛ and a second hard coating layer with a thickness of 30㎛ to 60㎛.

Description

Flexible Display Device The present invention relates to a flexible display device, and more specifically, to a flexible display device that effectively prevents scattering while improving surface hardness and indentation characteristics and enhancing impact resistance. As we enter the information age, the field of displays, which visually represent electrical information signals, has developed rapidly. In response to this, various display devices with excellent performance, such as thinness, lightness, and low power consumption, are being developed. Specific examples of such display devices include Liquid Crystal Displays (LCDs), Plasma Display Panel Devices (PDPs), Field Emission Display Devices (FEDs), and Organic Light Emitting Display Devices (OLEDs). Recently, the shapes and sizes of display devices have become increasingly diverse, and interest in flexible display devices, in particular, which can maintain their display performance even when folded or rolled, is continuously increasing. In response to this interest, research and development on panels, mechanisms, and cover windows with specific radii of curvature are being actively carried out. In particular, the cover window is a component visible to the user from the outer edge of the display device. Accordingly, it is desirable to use cover glass, which has superior appearance characteristics, rather than a plastic cover window. Due to the inherent properties of glass, it can exhibit folding characteristics when the thickness is limited to 0.1 mm or less. Consequently, although the rigidity of the glass itself is significantly superior to that of plastic, as mentioned earlier, its impact resistance is lower at this limited thickness compared to plastic cover windows, which allow for flexible thickness design. Therefore, it is vulnerable to external impacts compared to plastic cover windows, and a protective film is laminated or a protective coating layer is formed to prevent fragmentation in the event of damage from impact. FIG. 1 is a cross-sectional view of a flexible display device according to one embodiment of the present invention. FIGS. 2a to 2f are cross-sectional views illustrating a process of laminating a cover member and a protective film according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a flexible display device according to another embodiment of the present invention. FIG. 4 is a cross-sectional view of a flexible display device according to another embodiment of the present invention. FIG. 5 is a cross-sectional view of a flexible display device according to another embodiment of the present invention. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Shapes, areas, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are exemplary, and therefore the present invention is not limited to the depicted details. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing the present invention, if it is determined that a detailed description of related prior art may unnecessarily obscure the essence of the present invention, such detailed description is omitted. Where terms such as "includes," "has," or "is made up" are used in the present invention, other parts may be added unless "only" is used. When a component is expressed in the singular, it includes cases where it is included in the plural unless specifically stated otherwise. In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement. In the case of describing a positional relationship, for example, when the positional relationship between two parts is described using expressions such as 'on,' 'upper,' 'lower,' or 'next to,' one or more other parts may be located between the two parts unless 'immediately' or 'directly' is used. When an element or layer is referred to as "on" another element or layer, it includes cases where another layer or element is placed directly on top of or in between. Additionally, terms such as first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used merely to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the technical scope of the present invention. Throu