Polarizing Plate Optical Patterns Contrast Ratio
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Solution Overview
Problem
Existing polarizing plates for liquid crystal displays (LCDs) improve side contrast ratio but often reduce the front contrast ratio, leading to a need for a solution that enhances side viewing angle while minimizing the reduction in front contrast ratio.
Innovation Solution
A polarizing plate comprising a polarizing film and a contrast-improving optical film sequentially stacked, where the contrast-improving optical film includes a layer with a patterned portion having optical patterns and a flat section, optimized to satisfy specific thickness and height ratios to enhance both side and front contrast ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical patterns with inclined surfaces are used to improve side contrast ratio, then side viewing angle is improved, but front contrast ratio is reduced
Solution Approach 1:
The optical film is segmented into multiple functional layers: a first resin layer with optical patterns for side viewing angle improvement, and a second resin layer with flat sections for front contrast ratio maintenance. This segmentation allows each layer to perform its specific function without interfering with the other, resolving the contradiction between side and front contrast performance
Solution Approach 2:
Different regions of the optical film are assigned different optical properties: the optical pattern regions (inclined surfaces) provide light refraction for side viewing enhancement, while the flat sections provide uniform light transmission for front contrast maintenance. This local differentiation of optical qualities resolves the contradiction by ensuring each region contributes to its intended viewing direction
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 achieves a contrast ratio gain of about 1.00 or more, effectively improving side visibility while maintaining or reducing the decrement in front contrast ratio, thereby enhancing overall display performance.
Implementation Method 1
The optical pattern includes an inclined surface and can improve the contrast ratio by refracting and diffusing light incident upon the inclined surface
Implementation Method 2
The optical pattern includes an inclined surface and can improve the contrast ratio by refracting and diffusing light incident upon the inclined surface
Implementation Method 3
the flat section can diffuse light and maintain brightness by emitting light reaching the flat section
Data Source
AI summary
A polarizing plate and a liquid crystal display including the same are provided. A polarizing plate includes a polarizing film and a contrast-improving optical film sequentially stacked in the stated order. The contrast-improving optical film includes a contrast-improving layer including a first resin layer and a second resin layer facing the first resin layer. The second resin layer includes a patterned portion having optical patterns and a flat section between the optical patterns. The second resin layer satisfies Equation 1, and the polarizing plate has a contrast ratio gain of about 1.00 or more, as represented by Equation 2.