Polarizing Plate Pattern Layer Facets for Lateral Contrast
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Solution Overview
Problem
Existing polarizing plates for liquid crystal displays have limitations in improving lateral contrast ratio, viewing angle, and brightness ratio, as well as suppressing the Moiré phenomenon.
Innovation Solution
A polarizing plate with a pattern layer featuring a first and second facet on its lateral side, where the facets have different base angles and projection heights, satisfying specific angle and ratio relations, and a third facet at the top portion to enhance light transmission and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pattern layer with simple geometric shapes (trapezoidal, rectangular, or square) is used, then the manufacturing process is simple, but the lateral contrast ratio and viewing angle improvement are limited
Solution Approach 1:
The lateral side of the engraved pattern is divided into multiple facets (first facet and second facet) with different base angles. This segmentation allows each facet to control light transmission at different angles, thereby improving the lateral contrast ratio while maintaining manufacturability through standard molding processes.
Solution Approach 2:
Different regions of the pattern layer are given different local properties through the first and second facets having distinct base angles. The first facet with a larger base angle and the second facet with a smaller base angle create localized optical effects that enhance viewing angle and contrast ratio specifically at lateral positions.
2Adaptability or versatility
If the engraved pattern has a specific aspect ratio greater than 1.0, then the lateral viewing angle is improved, but the manufacturing complexity increases
Solution Approach 1:
The aspect ratio of the engraved pattern is optimized to be greater than 1.0, and the base angles of the facets are precisely controlled (first facet: 70°-90°, second facet: 0°-70°). By optimizing these parameters, the lateral viewing angle is enhanced while keeping the manufacturing process within acceptable complexity limits.
3Device complexity
If conventional pattern layers are used, then the structure is simple, but the Moiré phenomenon is not effectively suppressed
Solution Approach 1:
The pattern layer employs asymmetric facet configurations where the first and second facets have different base angles. This asymmetric structure disrupts the periodicity that causes Moiré patterns, thereby suppressing the Moiré phenomenon while maintaining relatively simple manufacturing processes.
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 significantly improves lateral contrast ratio, viewing angle, and brightness ratio while effectively suppressing the Moiré phenomenon, enhancing the overall performance of liquid crystal display optics.
Implementation Method 1
the pattern layer includes a first resin layer, the first resin layer being formed on a lower surface thereof with at least one engraved pattern having a lateral side, the lateral side having a first facet and a second facet consecutive to the first facet, the first facet and the second facet having different base angles with respect to a maximum width of the engraved pattern
Data Source
AI summary
A polarizing plate and an optical display device comprising same are provided. The polarizing plate comprises: a polarizer; and a pattern layer disposed on the upper surface of the polarizer. The pattern layer includes a first resin layer, wherein the first resin layer has one or more intaglio patterns formed on the lower surface thereof. The intaglio pattern has side surfaces, and a first surface and a second surface having different base angles with respect to the maximum width of the intaglio pattern are continuously formed on the side surfaces. The first and second surfaces satisfy Equation 1, and when h1 is a height projected on the first surface and h2 is a height projected on the second surface, among the maximum heights of the intaglio pattern, h1 and h2 satisfy Equation 2.