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KR-102964166-B1 - Display device

KR102964166B1KR 102964166 B1KR102964166 B1KR 102964166B1KR-102964166-B1

Abstract

A display device is provided. The display device comprises a folding area, a display panel, a first protective member disposed on the display panel, a second protective member disposed on the first protective member, a first adhesive member disposed between the display panel and the first protective member, and a second adhesive member disposed between the first protective member and the second protective member, having a modulus equal to or smaller than the modulus of the first adhesive member.

Inventors

  • 이정섭
  • 남지은
  • 이주현
  • 신헌정
  • 정태혁

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260513
Application Date
20210119

Claims (20)

  1. As a display device including a folding area, Display panel; A first protective member disposed on the above-mentioned display panel; A second protective member disposed on the first protective member and having a thickness smaller than that of the first protective member; A first adhesive member disposed between the display panel and the first protective member; and It includes a second adhesive member disposed between the first protective member and the second protective member, having a modulus smaller than the modulus of the first adhesive member, The first protective member is a display device positioned between the display panel and the second protective member.
  2. In Article 1, The modulus of the first adhesive member and the modulus of the second adhesive member are elastic modulus, and the display device is measured by dynamic mechanical analysis.
  3. In Article 2, A display device in which the modulus of the first adhesive member is within a range greater than 0 kPa and less than 100 kPa at -20°C, and the modulus of the second adhesive member is within a range greater than 0 kPa and less than 150 kPa at -20°C.
  4. delete
  5. In Article 1, A display device in which the first adhesive member includes a third thickness, and the second adhesive member includes a fourth thickness greater than the third thickness.
  6. In Article 1, The above folding region includes a first folding region and a second folding region that are separated from each other and each extend in a first direction, and A display device that is folded inward based on the first folding area and folded outward based on the second folding area.
  7. In Article 6, A display device further comprising a first non-folding area disposed on one side of a second direction intersecting the first direction of the first folding area, a second non-folding area disposed between the first folding area and the second folding area, and a third non-folding area disposed on the other side of the second direction of the second folding area.
  8. In Article 7, It further includes a display area for displaying a screen and a non-display area disposed outside the display area, The display area and the non-display area are a display device arranged across the first folding area, the second folding area, the first non-folding area, the second non-folding area, and the third non-folding area.
  9. In Article 1, The above second protective member is a display device in which the storage modulus increases as the frequency increases.
  10. In Article 9, A display device in which the increase in the storage modulus due to the increase in the frequency of the second protective member is greater when the frequency of the second protective member is greater than 1 Hz than when the frequency of the second protective member is less than 1 Hz.
  11. In Article 10, The storage modulus of the second protective member is in the range of 6 GPa to 1000 GPa when the frequency is 1 Hz, and in the range of 8 GPa to 1000 GPa when the frequency is 30000 Hz, and The storage modulus of the second protective member is a display device measured by Dynamic Mechanical Analysis (DMA).
  12. In Article 9, The above second protective member is a display device comprising at least one selected from polyethylene terephthalate (PET), triacetyl cellulose (TAC), transparent polyimide, and aramid.
  13. In Article 1, A display device in which the storage modulus of the first protective member is within the range of 1000 MPa to 2000 MPa at -20℃ and within the range of 100 MPa to 2000 MPa at 85℃.
  14. A display device comprising a first folding region and a second folding region that are separated and spaced apart from each other and each extending in a first direction, Display panel; A first protective member disposed on the above-mentioned display panel; A second protective member disposed on the first protective member, wherein the storage modulus increases as the frequency increases, and the second protective member having a thickness smaller than that of the first protective member; A first adhesive member disposed between the display panel and the first protective member; and A second adhesive member disposed between the first protective member and the second protective member, wherein The first protective member is positioned between the display panel and the second protective member, and It is folded inward based on the first folding area and folded outward based on the second folding area, A display device in which the modulus of the second adhesive member is smaller than the modulus of the first adhesive member.
  15. In Article 14, A display device in which the increase in the storage modulus due to the increase in the frequency of the second protective member is greater when the frequency of the second protective member is greater than 1 Hz than when the frequency of the second protective member is less than 1 Hz.
  16. In Article 15, The storage modulus of the second protective member is in the range of 6 GPa to 1000 GPa when the frequency is 1 Hz, and in the range of 8 GPa to 1000 GPa when the frequency is 30000 Hz, and The storage modulus of the second protective member is a display device measured by Dynamic Mechanical Analysis (DMA).
  17. In Article 14, The above second protective member is a display device comprising at least one selected from polyethylene terephthalate (PET), triacetyl cellulose (TAC), transparent polyimide, and aramid.
  18. In Article 14, An indicator device in which the elastic modulus of the second adhesive member is equal to or smaller than the elastic modulus of the first adhesive member.
  19. In Article 14, A display device in which the storage modulus of the first protective member is within the range of 1000 MPa to 2000 MPa at -20℃ and within the range of 100 MPa to 2000 MPa at 85℃.
  20. A display device comprising a first folding region and a second folding region that are separated and spaced apart from each other and each extending in a first direction, Display panel; A first protective member disposed on the above-mentioned display panel; A second protective member disposed on the first protective member and having a thickness smaller than that of the first protective member; A first adhesive member disposed between the display panel and the first protective member; and A second adhesive member disposed between the first protective member and the second protective member, wherein The first protective member is positioned between the display panel and the second protective member, and The storage modulus of the first protective member is within the range of 1000 MPa to 2000 MPa at -20℃ and within the range of 100 MPa to 2000 MPa at 85℃, and A display device in which the modulus of the second adhesive member is smaller than the modulus of the first adhesive member.

Description

Display device The present invention relates to a display device. As the information society develops, the demand for display devices to show images is increasing in various forms. For example, display devices are being applied to a wide range of electronic devices, such as smartphones, digital cameras, laptop computers, navigation systems, and smart televisions. Foldable displays have recently been attracting significant attention. They combine the advantages of both smartphones and tablet PCs by offering good portability and a large screen. The protective film for foldable displays requires high durability to protect the device's internal components, as well as high flexibility to ensure smooth folding. FIG. 1 is a perspective view showing a display device in an unfolded state according to one embodiment. FIG. 2 is a perspective view showing a folded state of a display device according to one embodiment. FIG. 3 is a cross-sectional view of a display device according to one embodiment in a non-folded state. Figure 4 is an enlarged view of area A of Figure 3. FIG. 5 is a cross-sectional view of a display device according to one embodiment in a folded state in a first folding area. Figure 6 is an enlarged view of area B of Figure 5. FIG. 7 is a cross-sectional view of a display device according to one embodiment in a state where it is out-folded in a second folding area. FIG. 8 is a graph showing the relationship between the modulus of the second protective member and external impact according to one embodiment. FIG. 9 is a cross-sectional view of a display panel according to one embodiment. FIG. 10 illustrates a portion of a cross-sectional view of a display device according to another embodiment. FIG. 11 illustrates a portion of a cross-sectional view of a display device according to another embodiment. FIG. 12 is a perspective view showing a display device in an unfolded state according to another embodiment. FIG. 13 is a perspective view showing a folded state of a display device according to the embodiment of FIG. 12. FIG. 14 is a perspective view showing the display device according to the embodiment of FIG. 12 in an out-folded state. 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. When elements or layers are referred to as being on another element or layer, this includes cases where another layer or element is interposed directly on or in the middle of another element. Throughout the specification, the same reference numerals refer to the same components. Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may also be the second component within the technical scope of the present invention. Specific embodiments will be described below with reference to the attached drawings. FIG. 1 is a perspective view showing a display device according to one embodiment in an unfolded state. FIG. 2 is a perspective view showing a display device according to one embodiment in a folded state. FIG. 2 shows a display device (1) according to one embodiment in an in-folded state based on a first folding area (FDA1) and an out-folded state based on a second folding area (FDA2). Referring to FIGS. 1 and 2, a display device (1) according to one embodiment displays a screen or image through a display area (DA) to be described later, and various devices including the display area (DA) may be included therein. For example, the display device (1) according to the embodiments of the present specification may be applied to various home appliances or Internet of Things devices other than smartphones, such as mobile phones, tablet PCs, PDAs (Personal Digital Assistants), PMPs (Portable Multimedia Players), televisions, game consoles, wristwatch-type electronic devices, head-mounted displays, personal computer monitors, laptop computers, car navigation systems, car dashboards, digital cameras, camcorders, external billboards, electronic display boards, medical devices, inspection devices, refrigerators and washing machines, etc. The display device (1) includes a display area (DA) and a non-display area (NDA). The display area (DA) can display a screen. The display area (DA) may include a plurality of pixels. The plurality of pixels may be arranged i