Optical Composite Film for VA Display Color Shift and Thickness

The patent divides the traditional single thick polarizing plate into multiple thin optically-uniaxial film layers with different refractive index characteristics. These segmented layers work together to achieve the polarization function that previously required a single thick plate, thereby reducing overall panel thickness while maintaining optical performance.

The patent employs composite optical structures consisting of multiple optically-uniaxial film layers with different extraordinary and ordinary light refractive indices. This composite approach replaces the traditional homogeneous polarizing plate, enabling thinner design while preserving the necessary polarization function through coordinated optical properties of the layered structure.

The patent applies different optical characteristics to different regions and layers of the optical film structure. By configuring optically-uniaxial layers with specific refractive index differences in specific orientations, the system achieves uniform brightness distribution across large viewing angles while maintaining accurate color representation, preventing the brightness saturation that causes color shift.

The patent utilizes precise control of refractive index parameters in the optically-uniaxial film layers. By selecting materials and configuring layers with specific extraordinary and ordinary light refractive indices, the system modifies the optical path and light distribution characteristics to eliminate brightness saturation effects at large viewing angles, thereby maintaining picture quality and color accuracy.