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KR-20260064855-A - Display apparatus, electronic device and method of manufacturing display apparatus

KR20260064855AKR 20260064855 AKR20260064855 AKR 20260064855AKR-20260064855-A

Abstract

One embodiment of the present invention discloses a display device comprising: a display module that implements visible light; a window member disposed to face one surface of the display module; and an adhesive layer disposed between the display module and the window member; wherein the adhesive layer is formed by curing a composition comprising an acrylic polymer, a crosslinking agent, a photoinitiator, a molecular weight regulator, or any combination thereof, and having a stress relaxation value of 0.01 or more and 0.07 or less before curing and a stress relaxation value of 0.30 or more and 0.50 or less after curing, and comprising a high molecular weight acrylic polymer having a first weight average molecular weight of at least 700,000 and a low molecular weight acrylic polymer having a second weight average molecular weight of less than 500,000, and wherein the content of the high molecular weight acrylic polymer is 30 parts by weight or more with respect to 100 parts by weight, which is the sum of the content of the high molecular weight acrylic polymer and the content of the low molecular weight acrylic polymer.

Inventors

  • 이주섭
  • 박영주
  • 유성수
  • 은상원
  • 이진영

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260508
Application Date
20241029

Claims (20)

  1. A display module that implements visible light; A window member positioned to face one side of the above-mentioned display module; and An adhesive layer disposed between the display module and the window member; comprising, The above adhesive layer is, An adhesive comprising a high molecular weight acrylic polymer having a first weight average molecular weight of at least 700,000 and a low molecular weight acrylic polymer having a second weight average molecular weight of less than 500,000 is cured to form, Before hardening, it has a stress relaxation value of 0.01 or more and 0.07 or less, and after hardening, it has a stress relaxation value of 0.30 or more and 0.50 or less, A display device having a content of 30 parts by weight or more of the high molecular weight acrylic polymer, based on 100 parts by weight, which is the sum of the content of the high molecular weight acrylic polymer and the content of the low molecular weight acrylic polymer.
  2. In Article 1, A display device having a first weight average molecular weight of 700,000 to 3,000,000.
  3. In Article 1, A display device having a second weight average molecular weight of 100,000 to 300,000.
  4. In Article 1, The stress relaxation value is a display device measured at 70℃.
  5. In Article 1, A display device in which the adhesive layer contains a transparent polymer that transmits at least a portion of visible light.
  6. In Article 1, A display device comprising a first adhesive layer and a second adhesive layer having different stress relaxation values, wherein the adhesive layer is a first adhesive layer and a second adhesive layer.
  7. In Article 6, A display device in which the second adhesive layer has a stress relaxation value of 0.4 or more and 0.6 or less before and after curing.
  8. In Article 6, The adhesive layer further includes a third adhesive layer having a stress relaxation value smaller than that of the second adhesive layer, and A display device comprising a second adhesive layer disposed between the first adhesive layer and the third adhesive layer.
  9. In Article 8, A display device in which the first adhesive layer and/or the third adhesive layer have a stress relaxation value of 0.01 or more and 0.07 or less before curing, and a stress relaxation value of 0.30 or more and 0.50 or less after curing.
  10. In Article 6, The creep value of the first adhesive layer at 50°C is 4% or more, the modulus at 25°C is 0.04 MPa to 0.70 MPa, and the tackiness is 0.5 kgf/in or more. A display device having a creep value of 4% or more at 50°C of the second adhesive layer and a modulus of 0.04 MPa to 0.70 MPa at 25°C.
  11. A display module that implements visible light; A window member positioned to face one side of the above-mentioned display module; and An adhesive layer disposed between the display module and the window member; comprising, A display device having the adhesive layer having a stress relaxation value of 0.01 or more and 0.07 or less before curing, a stress relaxation value of 0.30 or more and 0.50 or less after curing, a creep value of 4% or more at 50°C, and a modulus of 0.04 MPa to 0.70 MPa at 25°C.
  12. In Article 11, The adhesive layer is formed by curing an adhesive comprising a high molecular weight acrylic polymer having a first weight average molecular weight of at least 700,000 and a low molecular weight acrylic polymer having a second weight average molecular weight of less than 500,000. A display device having a content of 30 parts by weight or more of the high molecular weight acrylic polymer, based on 100 parts by weight, which is the sum of the content of the high molecular weight acrylic polymer and the content of the low molecular weight acrylic polymer.
  13. In Article 12, A display device having a first weight average molecular weight of 700,000 to 3,000,000.
  14. In Article 12, A display device having a second weight average molecular weight of 100,000 to 300,000.
  15. In Article 11, The above stress relaxation value is a display device measured at 70℃.
  16. In Article 11, A display device in which the adhesive layer contains a transparent polymer that transmits at least a portion of visible light.
  17. In Article 11, A display device comprising a first adhesive layer and a second adhesive layer having different stress relaxation values, wherein the adhesive layer is a first adhesive layer and a second adhesive layer.
  18. In Article 17, A display device in which the second adhesive layer has a stress relaxation value of 0.4 or more and 0.6 or less before and after curing.
  19. In Article 17, The adhesive layer further includes a third adhesive layer having a stress relaxation value smaller than that of the second adhesive layer, and A display device comprising a second adhesive layer disposed between the first adhesive layer and the third adhesive layer.
  20. In Article 19, A display device in which the first adhesive layer and/or the third adhesive layer have a stress relaxation value of 0.01 or more and 0.07 or less before curing, and a stress relaxation value of 0.30 or more and 0.50 or less after curing.

Description

Display apparatus, electronic device and method of manufacturing display apparatus Embodiments of the present invention relate to a display device, an electronic device, and a method for manufacturing a display device. Electronic devices such as smartphones, tablet PCs, digital cameras, laptop computers, navigation systems, and smart televisions that provide video to users include a display device for displaying video. The display device includes a display panel that generates and displays video and various input devices. An electronic device including a light-emitting element may include a display panel comprising a light-emitting display area and a bezel area that does not display light, a cover window protecting the display panel, and an adhesive film disposed between the display panel and the cover window. If penetrating bubbles generated during the process of removing bubbles that occur during the lamination process of the display panel and the window move beyond the bezel area into the display area, they are judged as defective and may affect the yield. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a cross-sectional view schematically illustrating a display device according to one embodiment of the present invention. Figure 2 is an enlarged view schematically illustrating an example of an enlarged view of A in Figure 1. Figure 3 is a drawing illustrating a modified example of Figure 2. FIG. 4 is a graph of temperature and pressure according to the autoclave process of a display device according to one embodiment of the present invention. Figure 5 is a diagram showing the movement of air in the adhesive layer in sections a to b of Figure 4. Figure 6 is a diagram showing the movement of air in the adhesive layer in sections b to c of Figure 5. Figure 7 is a graph showing the permeable bubble distance according to the stress relaxation (SR) value of the adhesive layer. Figure 8 is a graph showing the movement of air within the adhesive layer according to the stress relaxation (SR) value of the adhesive layer. FIG. 9 is a cross-sectional view schematically illustrating an adhesive layer according to one embodiment of the present invention. FIG. 10 is a cross-sectional view schematically illustrating an adhesive layer according to another embodiment of the present invention. FIG. 11 is a cross-sectional view schematically illustrating an adhesive layer according to another embodiment of the present invention. FIG. 12 is a plan view of a display device according to another embodiment of the present invention. FIG. 13 is a cross-sectional view schematically illustrating a region including the edge of FIG. 12. FIG. 14 is a cross-sectional view schematically illustrating a display device according to another embodiment of the present invention. FIG. 15 is a block diagram of an electronic device according to embodiments of the present invention. The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects 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 drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various forms. In the following embodiments, terms such as first, second, etc. are used not in a limiting sense, but for the purpose of distinguishing one component from another component. In the following examples, singular expressions include plural expressions unless the context clearly indicates otherwise. In the following embodiments, terms such as "include" or "have" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added. In the following embodiments, when a part such as a unit, area, or component is described as being on or above another part, it includes not only cases where it is directly on top of another part, but also cases where another unit, area, or component is interposed in between. In the following embodiments, terms such as "connect" or "combine" do not necessarily imply a direct and/or fixed connection or combination of two members unless the context clearly indicates otherwise, nor do they exclude the interposition of another member between the two members. In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and/or