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US 12,684,057 B2Granted
Back plate film
AssigneeXinmei Fontana Holding (Hong Kong) Limited
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.
Claims17
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;
- wherein the retardation base material layer is configured to compensate phase distortion of light transmitted through the display panel toward an imaging sensor by controlling phase retardation in an optical path;
- wherein the absolute value of the in-plane retardation (R0) value of the retardation base material layer is 10,000 nm or less;
- wherein the absolute value of the thickness direction retardation (Rth) value of the retardation base material layer is 10,000 nm or less;
- wherein the thickness-direction retardation Rth is negative.
46 more elements
Dependencies are inferred from the claim text.