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KR-102960494-B1 - ELECTRONIC DEVICE

KR102960494B1KR 102960494 B1KR102960494 B1KR 102960494B1KR-102960494-B1

Abstract

A display device may include a display panel comprising at least one folding area, an adhesive layer attached to the back surface of the display panel, and a protective film having a first surface attached to the adhesive layer and a second surface facing the first surface, wherein the protective film may include a polyimide film, a first antistatic layer disposed on one surface of the polyimide film defining the first surface, and a second antistatic layer disposed on the other surface of the polyimide film defining the second surface.

Inventors

  • 박성준

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260507
Application Date
20200330
Priority Date
20200214

Claims (20)

  1. A display panel including at least one folding area; An adhesive layer attached to the back surface of the above-mentioned display panel; and A protective film comprising a first surface attached to the adhesive layer and a second surface facing the first surface, the protective film being defined The above protective film is Polyimide film; A first antistatic layer disposed on one surface of the polyimide film and defining the first surface; and It includes a second antistatic layer disposed on the other side of the polyimide film and defining the second side, and An electronic device in which the polar surface energy of the first surface of the above protective film is 12 mN/m or more and 22 mN/m or less.
  2. In Article 1, The above polyimide film is an electronic device comprising biphenyltetracarboxylic acid dianhydride (BPDA) and a filler.
  3. In Article 2, The above filler is an electronic device having a size of 0.5 micrometers or more and 2 micrometers or less.
  4. In Article 1, The electronic device wherein each of the first antistatic layer and the second antistatic layer comprises a urethane-based binder.
  5. In Paragraph 4, An electronic device in which each of the first antistatic layer and the second antistatic layer further comprises isocyanate.
  6. delete
  7. In Article 1, An electronic device in which the sheet resistance of the first surface of the above protective film is 10⁶ Ω/□ or less.
  8. In Article 1, An electronic device in which the sheet resistance of one side of the adhesive layer attached to the back surface of the above display panel is 10⁹ Ω/□ or greater and 10¹¹ Ω/□ or less.
  9. In Article 1, An electronic device having an adhesive layer thickness of 10 micrometers or more and 25 micrometers or less.
  10. In Article 1, The above polyimide film is an electronic device having a yield point at a strain of 1.5% or more.
  11. In Article 1, An electronic device comprising at least one of the above polyimide film and the above adhesive layer further comprising an antistatic agent.
  12. In Article 1, An electronic device in which the haze of the above polyimide film is 5% or less.
  13. A display panel including at least one folding area; An adhesive layer attached to the back surface of the above-mentioned display panel; and It includes a protective film spaced apart from the display panel with the adhesive layer in between, The above protective film is, An antistatic layer directly attached to the above adhesive layer and comprising a urethane-based binder and an antistatic agent; and It comprises a base film containing biphenyltetracarboxylic acid dianhydride (BPDA) that is spaced apart from the adhesive layer with the antistatic layer in between, and An electronic device having a polar surface energy of one side of the antistatic layer directly attached to the adhesive layer of 12 mN/m or more and 22 mN/m or less.
  14. In Article 13, The above base film is an electronic device further comprising a filler having a size of 0.5 micrometers or more and 2 micrometers or less.
  15. In Article 13, The above protective film further comprises a lower antistatic layer spaced apart from the antistatic layer with the base film in between, and the lower antistatic layer comprises a urethane-based binder and an antistatic agent, in an electronic device.
  16. delete
  17. In Article 13, An electronic device in which the surface resistance of one side of the antistatic layer directly attached to the adhesive layer is 10⁶ Ω/□ or less.
  18. In Article 13, An electronic device in which the sheet resistance of one side of the adhesive layer attached to the back surface of the above display panel is 10⁹ Ω/□ or greater and 10¹¹ Ω/□ or less.
  19. In Article 13, An electronic device having an adhesive layer thickness of 10 micrometers or more and 25 micrometers or less.
  20. In Article 13, The above antistatic layer is an electronic device further comprising isocyanate.

Description

ELECTRONIC DEVICE The present invention relates to a foldable electronic device comprising a protective film. Electronic devices provide information to users by displaying various images on a display screen. Generally, electronic devices display information within an allocated screen. Recently, flexible electronic devices including foldable flexible display panels are being developed. Unlike rigid electronic devices, flexible electronic devices can be folded, rolled, or bent. Flexible electronic devices, which can change their shape in various ways, can be carried without being constrained by the existing screen size, thereby improving user convenience. FIG. 1a is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 1b is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of an electronic device according to one embodiment of the present invention, taken by cutting along I-I' of FIG. 1a. FIG. 3a is a cross-sectional view of a display panel according to one embodiment of the present invention. FIG. 3b is a cross-sectional view of a display panel according to one embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating a part of the configuration of an electronic device according to one embodiment of the present invention. FIG. 5 is a cross-sectional view illustrating a part of the configuration of an electronic device according to one embodiment of the present invention. FIG. 6a is a photograph of an electronic device according to a comparative example of the present invention. FIG. 6b is a photograph of an electronic device according to one embodiment of the present invention. FIG. 7 illustrates the stress-strain curve of a base film according to one embodiment of the present invention. FIG. 8 is a cross-sectional view illustrating a part of the configuration of an electronic device according to one embodiment of the present invention. FIG. 9 is a cross-sectional view of a protective member according to one embodiment of the present invention. In this specification, where a component (or region, layer, part, etc.) is described as being "on," "connected," or "combined" with another component, it means that it may be directly placed/connected/combined with the other component, or that a third component may be placed between them. Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of the components are exaggerated for the effective illustration of the technical content. "And/or" includes all one or more combinations that the associated configurations can define. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise. Additionally, terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Additionally, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and may be explicitly defined herein unless interpreted in an ideal or overly formal sense. Terms such as "include" or "have" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1a is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 1b is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 1a shows the electronic device (1000) in an unfolded state, and FIG. 1b shows the electronic device (1000) in a folded state. Referring to FIGS. 1a and 1b, the electronic device (1000) may be a device that is activated by an electrical signal. For example, the electronic device (1000) may be a mobil