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US 2024/0406299 A1Published application
Back Plate Film
AssigneeLG Chem, Ltd.
InventorsJin Hoo Kim, Dong Hwan Ryu, Jong Pil Roh
Life of this patent
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Abstract
The present application relates to a back plate film. The present application provides a back plate film for an under-display camera in which a front camera of a mobile phone can capture a subject without image distortion. The back plate film of the present application can be usefully used in, for example, an OLED panel.
Claims19
A back plate film comprising:
- a retardation base material layer;
- and
- a first pressure-sensitive adhesive layer formed on one side of the retardation base material layer, wherein
- an absolute value of an in-plane retardation (R0) value calculated by Equation 1 below of the retardation base material layer is 6,000 nm or more, and an absolute value of a thickness direction retardation (Rth) value calculated by Equation 2 below is 6,000 nm or more:
- R
-
- 0
- =
- (
- n
-
- x
- -
- n
-
- y
- )
- ×
- d
- [
- Equation
-
- 1
- ]
- Rth
- =
- [
- (
- n
-
- x
- +
- ny
- )
- /
- 2
- -
- nz
- ]
- ×
- d
- [
- Equation
-
- 2
- ]
- wherein, nx, ny, and nz are refractive indices of the retardation base material layer in the x-axis direction, y-axis direction, and z-axis direction for light with a wavelength of 550 nm, respectively, and d is a thickness (nm) of the retardation base material layer.
44 more elements
Dependencies are inferred from the claim text.