Window and display device including the same
A display device includes: a display panel; and a window on the display panel, wherein the window includes a glass substrate having a thickness of 20 micrometers (μm) to 100 μm, and the glass substrate contains, on a basis of an entirety of the glass substrate, more than 75 mol % and less than 85 mol % of SiO 2 , more than 10 mol % and less than 20 mol % of Na 2 O, and more than 0 mol % and less than 10 mol % of CaO, respectively.
1 . A window comprising:
a glass substrate having a thickness in a range of 20 micrometers (μm) to 100 μm,
wherein the glass substrate contains, on a basis of an entirety of the glass substrate, more than 75 mol % and less than 85 mol % of SiO 2 , more than 10 mol % and less than 20 mol % of Na 2 O, and more than 3 mol % and less than 10 mol % of CaO.
2 . The window of claim 1 , wherein the glass substrate has a hardness of greater than 4.5 GPa and less than 5.0 GPa.
3 . The window of claim 1 , wherein the glass substrate has a brittleness of greater than 4.8 μm −0.5 and less than 5.8 μm −0.5 .
4 . The window of claim 1 , wherein the glass substrate has a Young's modulus of greater than 60 GPa and less than 70 GPa.
5 . The window of claim 1 , wherein the glass substrate has a coefficient of thermal expansion of greater than 85×10 −7 /K and less than 95×10 −7 /K.
6 . The window of claim 1 , wherein the glass substrate has a fracture toughness of greater than 0.7 MPa·m 0.5 and less than 1.2 MPa·m 0.5 .
7 . The window of claim 1 , wherein the glass substrate has a glass transition temperature of greater than 500° C. and less than 600° C.
8 . The window of claim 1 , wherein the glass substrate has a Poisson's ratio of greater than 0.18 and less than 0.22.
9 . The window of claim 1 , wherein the glass substrate has a density of greater than 2.3 g/cm 3 and less than 2.6 g/cm 3 .
10 . A window comprising:
a glass substrate having a thickness of 20 micrometers (μm) to 100 μm,
wherein the glass substrate contains, on a basis of an entirety of the glass substrate, 78 mol % or more and less than 85 mol % of SiO 2 , an alkali oxide, and an alkaline earth metal oxide, and has a ratio of moles of Al 2 O 3 to moles of the alkali oxide that is equal to zero.
11 . The window of claim 10 , wherein the glass substrate contains more than 13 mol % and less than 18 mol % of the alkali oxide on a basis of an entirety of the glass substrate.
12 . The window of claim 10 , wherein the glass substrate contains more than 0 mol % and less than 10 mol % of the alkaline earth metal oxide on a basis of an entirety of the glass substrate.
13 . The window of claim 10 , wherein the alkali oxide is Na 2 O.
14 . The window of claim 13 , wherein the glass substrate contains more than 10 mol % and less than 20 mol % of the Na 2 O, on a basis of an entirety of the glass substrate.
15 . The window of claim 10 , wherein the alkaline earth metal oxide is CaO.
16 . The window of claim 15 , wherein the glass substrate contains more than 0 mol % and less than 10 mol % of the CaO, on a basis of an entirety of the glass substrate.
17 . The window of claim 10 , wherein the glass substrate has a hardness of greater than 4.5 GPa and less than 5.0 GPa, and has a brittleness of greater than 4.8 μm −0.5 and less than 5.8 μm −0.5 .
18 . A display device comprising:
a display panel; and
a window on the display panel,
wherein the window includes a glass substrate having a thickness of 20 micrometers (μm) to 100 μm, and
the glass substrate contains, on a basis of an entirety of the glass substrate, more than 75 mol % and less than 85 mol % of SiO 2 , more than 10 mol % and less than 20 mol % of Na 2 O, and more than 3 mol % and less than 10 mol % of CaO, respectively.
19 . The display device of claim 18 , wherein the glass substrate has a hardness of greater than 4.5 GPa and less than 5.0 GPa, and has a brittleness of greater than 4.8 μm −0.5 and less than 5.8 μm −0.5 .
20 . The display device of claim 18 , further comprising an adhesive layer between the display panel and the window.