Optical Composite Film for VA Display Viewing Angle Correction
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Solution Overview
Problem
Large-sized vertical alignment (VA) liquid crystal display panels suffer from significant 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 is used, which replaces the polarizing plates to improve color shift at large viewing angles and reduce panel thickness. The optically-uniaxial optical film layer has a higher extraordinary refractive index than the substrate layer, allowing for refraction and allocation of light energy from the front to the large viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarizing plates are used in the display panel, then the display panel can achieve proper polarization and light control, but the panel thickness increases to 400 μm
Solution Approach 1:
The patent extracts and eliminates the polarizing plates from the display panel structure, replacing them with a reflection grating film layer that provides the necessary optical function without the thickness penalty of traditional polarizing plates
Solution Approach 2:
The patent changes the optical parameters by introducing a reflection grating structure with specific periodicity and depth, which replaces the polarization function traditionally provided by thick polarizing plates, thereby achieving the same optical effect with reduced thickness
2Productivity
If VA liquid crystal panel structure is used, then production efficiency is high and manufacturing costs are low, but color shift and picture quality deteriorate at large viewing angles
Solution Approach 1:
The patent segments the optical control function by introducing a reflection grating film layer with multiple periodic structures, which differentially controls light at different viewing angles, thereby improving picture quality while maintaining the VA panel's production efficiency
Solution Approach 2:
The patent creates a composite optical structure combining the reflection grating film layer with the liquid crystal layer, where the grating structure compensates for the VA panel's viewing angle limitations without requiring changes to the liquid crystal material itself, thus maintaining manufacturing simplicity
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 effectively alleviates color shift issues at large viewing angles and reduces the display panel's thickness by using a metal grating film layer and optically-uniaxial optical film layer, maintaining display resolution and transmission rate while eliminating the need for polarizing plates.
Implementation Method 1
an optically-uniaxial optical film layer, comprising a plate-shaped portion and a plurality of refraction portions... the plurality of refraction portions is selected from one type of camber columns and quadrangular prisms... a refractive index of the substrate layer is less than an extraordinary light refractive index of the optically-uniaxial optical film layer
Implementation Method 2
a reflection grating film layer... the plurality of refraction portions is accommodated in the substrate 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 stacked 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, and the plurality of refraction portions is selected from one type of camber columns and quadrangular prisms; and the substrate layer is stacked on a side of the plate-shaped portion close to the refraction portion, where the plurality of refraction portions is accommodated in the substrate layer, and a refractive index of the substrate layer is less than an extraordinary light refractive index of the optically-uniaxial optical film layer.