Patterned Polarizing Plate Enhancing Side Contrast Ratio
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Solution Overview
Problem
Existing optical films struggle to significantly improve the side contrast ratio of liquid crystal displays without compromising optical transparency or hindering polarized light emission, often requiring additional processes and particles that can lead to increased haze and reduced luminous efficacy.
Innovation Solution
A polarizing plate design featuring a polarizing film with a first base layer and a pattern layer, where the pattern layer consists of two layers with a higher and lower refractive index, respectively, and includes engraved optical patterns and flat sections, enhancing light diffusion without incorporating particles, thereby improving side contrast ratio while maintaining optical transparency and luminous efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If particles are incorporated into the low refractive index resin layer or high refractive index resin layer to improve side contrast ratio, then side contrast ratio is improved, but optical transparency deteriorates (haze increases and luminous efficacy reduces)
Solution Approach 1:
The invention extracts and eliminates particles from the resin layers while maintaining the refractive index difference mechanism. Instead of using particle incorporation, the patent uses a pure resin layer structure where the low refractive index resin layer (n1) and high refractive index resin layer (n2) achieve contrast improvement through their inherent refractive index properties without any particulate additives.
Solution Approach 2:
The invention changes the refractive index parameters of the resin layers themselves rather than adding particles. The low refractive index resin layer has n1 < 1.45 and the high refractive index resin layer has n2 > 1.60, creating a refractive index difference that improves side contrast ratio without compromising optical transparency.
2Illumination intensity
If particles are incorporated into the resin layer to improve side contrast ratio, then side contrast ratio is improved, but additional processes are required to control refractive index difference
Solution Approach 1:
The invention removes the need for particle incorporation processes entirely. The manufacturing process only requires forming the low refractive index resin layer and high refractive index resin layer as continuous resin structures, eliminating the complex steps of particle selection, dispersion, and concentration control that would otherwise be necessary.
3Illumination intensity
If pattern shape is changed to improve side contrast ratio, then side contrast ratio is improved, but even minute changes cause drastic change in side contrast ratio
Solution Approach 1:
The invention changes the refractive index parameter of the resin layers rather than relying on precise pattern shape control. By adjusting the refractive index difference between the low refractive index resin layer (n1 < 1.45) and high refractive index resin layer (n2 > 1.60), the patent achieves side contrast improvement that is insensitive to minor variations in pattern dimensions.
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 proposed polarizing plate effectively enhances the side contrast ratio of liquid crystal displays without reducing the front contrast ratio, maintaining optical transparency and preventing haze, thus improving overall display performance.
Implementation Method 1
light from a polarizing film can be diffused by a pattern formed at an interface between a low refractive index resin layer and a high refractive index resin layer as the light enters the high refractive index resin layer from the low refractive index resin layer
Data Source
AI summary
A polarizing plate and an optical display including the same are provided. A polarizing plate includes: a polarizing film; a first base layer; and a pattern layer, the first base layer and the pattern layer being sequentially arranged on a light exit surface of the polarizing film, and the pattern layer includes a first layer and a second layer sequentially arranged on the first base layer, the first layer having a higher index of refraction than the second layer, and the first layer includes a patterned portion at at least a portion thereof facing the second layer, the patterned portion including at least two optical patterns and a flat section between optical patterns of the at least two optical patterns that are adjacent to each other.