Optical film
AssigneeBenQ Materials Corporation
InventorsYu-Wei Tu, Chih-Wei Lin, Kuo-Hsuan Yu
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Abstract
An optical film applied for a viewing side of a display is disclosed. The optical film comprises a birefringent substrate with a birefringence difference not greater than 0.10 having a slow axis and a fast axis perpendicular to each other and an diffusing layer disposed on the birefringent substrate, wherein the total haze of the optical film ranges between 30% and 80% and the reflectivity of the optical film satisfies the relationship (RSCI−RSCE)≤1.0%, and RSCE/(RSCI−RSCE)≥1.6, wherein RSCI is an average reflectivity of diffuse component and specular component of the optical film, and RSCE is an average reflectivity of diffuse component of the optical film.
Claims18
An optical film, comprising:
- a birefringent substrate with a birefringence (Δn) of not more than 0.10 having a slow axis and a fast axis perpendicular to each other;
- and
- a light diffusing layer disposed on one side of the birefringent substrate;
- wherein a total haze of the optical film ranges between 30% and 80%, and a reflectivity of the optical film satisfies the relationship:
- (RSCI−RSCE)≤1.0%, and RSCE/(RSCI−RSCE)≥1.6.
An optical film, comprising:
- a birefringent substrate with a birefringence (Δn) of not more than 0.10 having a slow axis and a fast axis perpendicular to each other;
- a light diffusing layer having a refractive index of n1 disposed on one side of the birefringent substrate;
- and
- a refractive-index-matching layer having a refractive index of n2 disposed on the other side of the light diffusing layer opposite to the birefringent substrate, and n2<n1;
- wherein a total haze of the optical film ranges between 30% and 80%, and a reflectivity thereof satisfies the relationship:
- (RSCI−RSCE)≤1.0%, and RSCE/(RSCI−RSCE)≥1.6.
A polarizer, comprising:
- a polarizing layer with an absorption axis;
- and
- an optical film comprising:
- a birefringent substrate with a birefringence (Δn) of not more than 0.10 having a slow axis and a fast axis perpendicular to each other, wherein the birefringent substrate is adjacent to the polarizing layer and the slow axis thereof is parallel to the absorption axis of the polarizing layer;
- and
- a light diffusing layer disposed on the other side of the birefringent substrate opposite to the polarizing layer;
- wherein a total haze of the optical film ranges between 30% and 80%, and a reflectivity thereof satisfies the relationship:
- (RSCI−RSCE)≤1.0%, and RSCE/(RSCI−RSCE)≥1.6.
Dependencies are inferred from the claim text.