Optical Composite Film for VA Display Viewing Angle Compensation
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Solution Overview
Problem
Large-sized vertical alignment (VA) liquid crystal display panels suffer from severe color shift and reduced picture quality at large viewing angles due to rapid brightness saturation, and their thickness is increased by the use of thick polarizing plates.
Innovation Solution
An optical composite film comprising a reflection grating film layer, an optically-uniaxial optical film layer with refraction portions, and a substrate layer, which together reduce the thickness of the display panel and improve color shift at large viewing angles by refracting light from a denser to a thinner medium, replacing the need for polarizing plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick polarizing plates are used in LCD display panels, then the panel can achieve proper optical functionality, but the panel thickness increases significantly
Solution Approach 1:
The patent extracts and removes the thick polarizing plate component (typically 200μm per plate) from the LCD panel structure and replaces it with a thin-film polarizing layer. This extraction eliminates the bulk thickness while preserving the essential optical function of polarizing light, directly resolving the contradiction between optical functionality and panel thickness.
Solution Approach 2:
The patent substitutes the mechanical/thick-film polarizing plate with a thin-film polarizing layer that achieves the same optical effect through a different physical implementation. This replacement maintains the optical functionality while dramatically reducing the thickness contribution of this component.
2Productivity
If VA liquid crystal panel architecture is used, then production efficiency and manufacturing cost are improved, but color shift and picture quality deteriorate at large viewing angles
Solution Approach 1:
The patent introduces a viewing angle compensation film layer with specific optical properties (negative refractive index) that is locally applied to the VA panel structure. This layer provides directional optical compensation that corrects color shift at oblique viewing angles while preserving the overall VA panel architecture and its manufacturing advantages.
Solution Approach 2:
The patent changes the optical parameters of the display system by introducing a film layer with negative refractive index. This parameter change enables the VA panel to maintain consistent color and brightness across different viewing angles by compensating for the optical deficiencies inherent in the VA mode, thus resolving the color shift issue without sacrificing production efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optical composite film enhances color accuracy and reduces panel thickness by effectively allocating light energy from the front to large viewing angles, maintaining high display resolution and transmission rates without the need for sub-pixel division or additional driving elements.
Implementation Method 1
an optically-uniaxial optical film layer with refraction portions, which together reduce the thickness of the display panel and improve color shift at large viewing angles by refracting light from a denser to a thinner medium
Implementation Method 2
a reflection grating film layer
Data Source
AI summary
An optical composite film includes a reflection grating film layer, an optically-uniaxial optical film layer, and a substrate layer. The optically-uniaxial optical film layer includes a plate-shaped portion and a plurality of refraction portions, where the plate-shaped portion is disposed on the reflection grating film layer, the plurality of refraction portions is disposed on a side of the plate-shaped portion away from the reflection grating film layer, the plurality of refraction portions is selected from one type of camber columns and quadrangular prisms, and an extraordinary light refractive index of the optically-uniaxial optical film layer is less than an ordinary light refractive index of the optically-uniaxial optical film layer; and the substrate layer is stacked on a side of the plate-shaped portion close to the refraction portion.