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KR-20260062233-A - GLASS COMPOSITION, GLASS ARTICLE PREPARED THEREFROM AND DISPLAY DEVICE

KR20260062233AKR 20260062233 AKR20260062233 AKR 20260062233AKR-20260062233-A

Abstract

A glass product according to one embodiment comprises , as a glass composition, 45 mol% to 60 mol% of SiO₂ with respect to total weight, more than 35 mol% and less than 45 mol% of B₂O₃ , more than 3 mol% and less than 9 mol% of Na₂O , and more than 0 and less than 8 mol% of Al₂O₃ .

Inventors

  • 이회관
  • 김성원
  • 이상덕
  • 이준엽

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260507
Application Date
20241028

Claims (20)

  1. A glass product comprising, with respect to total weight, 45 mol% to 60 mol% SiO₂ , more than 35 mol% and less than 45 mol % B₂O₃ , more than 3 mol% and less than 9 mol% Na₂O , and more than 0 and less than 8 mol % Al₂O₃ as a glass composition.
  2. In Article 1, A glass product in which the ratio of the content of SiO2 to the content of B2O3 is 1 or greater.
  3. In Article 1, A glass product in which the difference between the content of B₂O₃ and the content of Na₂O is 40 mol% or less.
  4. In Article 1, A glass product in which the ratio of the content of Na₂O to the content of Al₂O₃ is greater than 1.
  5. In Article 1, Glass products containing more than 0 and less than or equal to 5 mol% of K₂O .
  6. In Article 5, A glass product in which the ratio of the sum of the content of Na₂O and the content of K₂O to the content of Al₂O₃ is greater than 1.
  7. In Article 1, The above glass product is a glass product having a thickness in the range of 50㎛ to 100㎛.
  8. In Article 1, Glass products having an elastic modulus in the range of 30 GPa to 55 GPa.
  9. A glass composition comprising, based on total weight, 45 mol% to 60 mol% SiO₂ , more than 35 mol% and less than 45 mol% B₂O₃ , more than 3 mol% and less than 9 mol% Na₂O , and more than 0 and less than 8 mol% Al₂O₃ .
  10. In Article 9, A glass composition in which the ratio of the content of SiO2 to the content of B2O3 is 1 or greater.
  11. In Article 9, A glass composition in which the difference between the content of B₂O₃ and the content of Na₂O is 40 mol% or less.
  12. In Article 9, A glass composition in which the ratio of the content of Na₂O to the content of Al₂O₃ is greater than 1.
  13. In Article 9, A glass composition further comprising more than 0 and less than or equal to 5 mol% of K₂O .
  14. In Article 9, A glass composition in which the ratio of the sum of the content of Na₂O and the content of K₂O to the content of Al₂O₃ is greater than 1.
  15. A display panel including multiple pixels; A cover window positioned on the upper part of the above display panel; and It includes an optically transparent bonding layer disposed between the above-mentioned display panel and the above-mentioned cover window, and A display device comprising, with respect to total weight, a cover window having a glass composition comprising 45 mol% to 60 mol% SiO₂ , more than 35 mol% and less than 45 mol% B₂O₃ , more than 3 mol% and less than 9 mol% Na₂O , and more than 0 and less than 8 mol % Al₂O₃ .
  16. In Article 15, A display device in which the ratio of the content of SiO2 to the content of B2O3 is 1 or greater.
  17. In Article 15, A display device in which the difference between the content of B₂O₃ and the content of Na₂O is 40 mol% or less, and the ratio of the content of Na₂O to the content of Al₂O₃ is greater than 1.
  18. In Article 15, It further contains K₂O greater than 0 and less than or equal to 5 mol%, and A display device in which the ratio of the sum of the content of Na₂O and the content of K₂O to the content of Al₂O₃ is greater than 1.
  19. In Article 15, A display device having a cover window thickness in the range of 50㎛ to 100㎛.
  20. In Article 15, A display device having an elastic modulus of the cover window in the range of 30 GPa to 55 GPa.

Description

Glass composition, glass product prepared therefrom, and display device The present invention relates to a glass composition, a glass product manufactured therefrom, and a display device. Glass products are widely used in electronic devices including display devices and building materials. For example, glass products are applied to substrates or cover windows that protect flat panel display devices such as liquid crystal display devices (LCDs), organic light emitting display devices (OLEDs), and electrophoretic display devices. As portable electronic devices such as smartphones and tablet PCs become more common, the glass products used in them are frequently exposed to external impacts. For portability, there is a demand for the development of glass products that are thin yet can withstand external impacts. Recently, foldable display devices are being researched for user convenience. Glass products applied to foldable display devices are desirable to have a thin thickness to relieve bending stress when folded, while also possessing strength capable of withstanding external impacts. Accordingly, there have been attempts to improve the strength of thin glass products by changing the component ratios of the glass product composition and manufacturing process conditions. FIG. 1 is a perspective view of a glass product according to various embodiments. FIG. 2 is a perspective view showing a display device with a glass product applied according to one embodiment in an unfolded state. FIG. 3 is a perspective view showing the display device of FIG. 2 in a folded state. FIG. 4 is a cross-sectional view illustrating an example in which a glass product according to one embodiment is applied as a cover window of a display device. FIG. 5 is a cross-sectional view of a glass product in the shape of a flat plate according to one embodiment. FIG. 6 is a graph showing the stress profile of a glass product according to one embodiment. FIG. 7 is a flowchart showing the steps of the manufacturing process of a glass product according to one embodiment. Figure 8 is a schematic diagram showing the cutting step of Figure 7 and the surface polishing step after strengthening. 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. Elements or layers referred to as "on" another element or layer include cases where another layer or element is interposed directly above or in the middle of another element. Likewise, "below," "left," and "right" refer to cases where they are interposed immediately adjacent to another element or where another layer or material is interposed in the middle. 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. Hereinafter, embodiments will be described with reference to the attached drawings. FIG. 1 is a perspective view of a glass product according to various embodiments. Glass is used as cover windows to protect display units in electronic devices containing display components, such as tablet PCs, laptop PCs, smartphones, e-books, televisions, and PC monitors, as well as refrigerators and washing machines; it is also used as substrates for display panels, substrates for touch panels, and optical components such as light guide plates. Glass can also be used as cover glass for automotive instrument panels, cover glass for solar cells, interior building materials, and windows for buildings or houses. Glass is required to have high strength. For example, in the case of window glass, it is desirable to have a thin thickness to meet the requirements of high transmittance and light weight, while also having strength that prevents it from easily breaking due to external impact. Strengthened glass can be manufactured by methods such as chemical strengthening or thermal strengthening. Examples of tempered glass of various shapes are shown in FIG. 1. Hereinafter, the present invention is described as a glass product, but the glass product may refer to the same as the glass described above. Referring to FIG. 1, in one embodiment, the glass product (100) may be in the shap