Polarizing Plate Optical Layer for Wide-Angle LCD Visibility
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Solution Overview
Problem
Liquid crystal display devices suffer from low visibility and brightness when viewed from the side, and existing visibility improvement layers with patterns face challenges in yield degradation and material costs.
Innovation Solution
A polarizing plate with an optical functional layer containing a mixture of acicular and isotropic particles, where the acicular particles are oriented in-plane with controlled orientation angles and standard deviation, enhancing visibility and controlling haze without a pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a visibility improvement layer with pattern is added to the viewer-side polarizing plate, then visibility and brightness when viewed from the side are improved, but yield degradation and material costs increase due to the pattern forming process
Solution Approach 1:
The invention extracts the pattern forming process from the visibility improvement solution. Instead of using a patterned visibility improvement layer, the patent applies a uniform optical functional layer containing particles with specific refractive indices that provides visibility improvement without requiring complex pattern formation, thereby eliminating yield degradation and additional material costs associated with patterning processes
Solution Approach 2:
The optical functional layer serves multiple functions simultaneously: it improves visibility and brightness when viewed from the side, maintains high total light transmittance, and eliminates the need for separate pattern forming processes. This multi-functional layer combines the benefits of visibility improvement with manufacturing simplicity
2Illumination intensity
If multiple layers are stacked to improve visibility, then visibility when viewed from the side is improved, but device complexity and thickness increase
Solution Approach 1:
The invention merges multiple functional requirements into a single optical functional layer. Instead of stacking separate visibility improvement layers, anti-glare layers, and anti-reflection layers, the patent combines these functions into one layer containing particles with specifically controlled refractive indices (1.30-1.60), thereby reducing device complexity and total thickness while maintaining visibility improvement
3Illumination intensity
If the refractive index of the optical functional layer is increased to improve visibility, then visibility when viewed from the side is improved, but total light transmittance decreases
Solution Approach 1:
The invention optimizes the refractive index parameter of the optical functional layer within a specific range (1.30-1.60). By carefully selecting and controlling the refractive index, the patent achieves visibility improvement when viewed from the side while maintaining high total light transmittance of 90% or more, resolving the trade-off between visibility and light transmission
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
Improves visibility and brightness uniformly across front and side surfaces, reduces thickness, and maintains high total light transmittance without the need for a visibility improvement layer.
Implementation Method 1
the acicular particles are oriented in an in-plane direction of the optical functional layer
Implementation Method 2
the optical functional layer includes a mixture of anisotropic particles and isotropic particles
Implementation Method 3
when a light absorption axis of the polarizer is 0°
Data Source
AI summary
A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes a polarizer, and an optical functional layer on a light emission surface of the polarizer, and the optical functional layer includes a mixture of anisotropic particles and isotropic particles, the anisotropic particles include acicular particles, and the acicular particles are oriented in an in-plane direction of the optical functional layer, and when a light absorption axis of the polarizer is 0°, an average value of orientation angles formed between the light absorption axis of the polarizer and a longitudinal direction of the acicular particles is in a range from −10° to +10°, and a standard deviation of the orientation angles is 15° or less.