Patterned Polarizing Plate for Wider Viewing Angle and Low Rainbow
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Solution Overview
Problem
Liquid crystal displays suffer from poor contrast ratio and viewing angle when viewed from the side and exhibit reflective rainbow in the non-operation state due to external light scattering, with conventional solutions increasing thickness and complexity.
Innovation Solution
A polarizing plate with a patterned portion comprising a first resin layer and a second resin layer, where the first resin layer has a different index of refraction and includes first optical patterns with specific dimensions, and second optical patterns are formed between adjacent first patterns to improve contrast ratio and viewing angle in the operation state, while reducing reflective rainbow in the non-operation state without additional films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an antireflection film or low reflectivity film is added to the viewer-side polarizing plate to reduce reflective rainbow in the non-operation state, then the reflective rainbow is reduced, but the thickness of the polarizing plate increases and additional manufacturing processes are required
Solution Approach 1:
The patent combines the antireflection function with the existing polarizing plate structure by forming a patterned resin layer directly on the polarizer. This integration merges the protective and optical functions into a single component, eliminating the need for separate antireflection films while reducing overall thickness
Solution Approach 2:
The patterned resin layer creates local variations in refractive index through its periodic structure, with different regions having optimized optical properties. This local quality variation enables antireflection functionality in specific areas without compromising the overall polarizing performance or requiring uniform thickening of the entire plate
2Manufacturing precision
If a patterned film is added to improve contrast ratio and viewing angle in the operation state, then the contrast ratio and viewing angle are improved, but the device complexity and manufacturing process complexity increase
Solution Approach 1:
The patterned resin layer is divided into multiple periodic patterns with specific geometric configurations. This segmentation creates discrete optical zones that collectively improve contrast ratio and viewing angle through controlled light manipulation, achieving high manufacturing precision without excessive overall complexity
Solution Approach 2:
The patterned resin layer simultaneously serves multiple functions: it acts as a protective coating, provides antireflection properties, and enhances contrast ratio and viewing angle. This multi-functionality reduces the need for separate components, thereby decreasing device complexity while maintaining high manufacturing precision
3Manufacturing precision
If a patterned film is added to improve contrast ratio and viewing angle in the operation state, then the contrast ratio and viewing angle are improved, but additional manufacturing processes are required
Solution Approach 1:
The patterned resin layer is formed as an integral part of the polarizing plate manufacturing process, combining the protective layer formation with the optical pattern creation. This merging eliminates the need for separate film lamination or additional coating processes, simplifying manufacturing while achieving precise viewing angle characteristics
Solution Approach 2:
The patent optimizes specific parameters of the patterned resin layer including pattern pitch, depth, and refractive index to achieve the desired viewing angle performance. By carefully controlling these parameters within specific ranges, the invention achieves high manufacturing precision through standard manufacturing processes without requiring complex additional steps
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 polarizing plate enhances contrast ratio and viewing angle in both front and lateral sides during operation and reduces reflective rainbow without additional layers, maintaining thickness and simplifying manufacturing processes.
Implementation Method 1
a patterned portion including a first resin layer and a second resin layer stacked on at least one surface of the polarizer, the first resin layer having a different index of refraction from the second resin layer
Implementation Method 2
reduction in reflective rainbow caused by external light... scattering of the external light from the screen
Data Source
AI summary
Disclosed herein are a polarizing plate and an optical display apparatus including the same. A polarizing plate includes: a polarizer; and a patterned portion including a first resin layer and a second resin layer stacked on at least one surface of the polarizer and having different indexes of refraction, and the first resin layer is a patterned layer including: multiple first optical patterns formed at intervals at an interface with the second resin layer; and one or more second optical patterns formed between each pair of adjacent first optical patterns, and the first optical pattern and the second optical pattern satisfy Relations 1 to 3 set forth herein.