Polarizer Chroma Viewing Angle Enhancement Layer
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Solution Overview
Problem
Conventional liquid crystal display devices, especially those in VA mode, suffer from poor chroma viewing angles and significant color deviation when viewed from side angles, with existing solutions like viewing angle expansion films reducing frontal brightness and contrast ratio.
Innovation Solution
A polarizer with a chroma viewing angle enhancement layer comprising a resin composite with a light diffusion agent, where the light diffusion agent is aligned at an acute angle between 0° and 40°, enhancing the chroma viewing angle without negatively affecting brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a viewing angle expansion film is affixed onto the upper polarizer, then the chroma viewing angle is enhanced, but the frontal brightness is reduced and contrast ratio decreases
Solution Approach 1:
The patent applies local quality by creating a chroma viewing angle enhancement layer with specific localized properties. The layer contains light diffusion agents (such as Teflon particles or hollow glass beads) dispersed in a resin matrix, positioned specifically between the upper polarizer and the liquid crystal panel. This localized structure provides different optical properties in different regions and directions, enhancing chroma viewing angle in oblique directions while maintaining frontal brightness through controlled light diffusion rather than uniform scattering.
Solution Approach 2:
The patent employs composite materials by formulating the chroma viewing angle enhancement layer as a composite structure consisting of a resin matrix (such as UV-curable resin or epoxy resin) combined with light diffusion agents (Teflon particles, hollow glass beads, or silica particles). This composite material approach allows optimization of both chroma viewing angle enhancement and light transmission properties, resolving the contradiction between viewing angle improvement and brightness maintenance through material composition design.
2Adaptability or versatility
If a viewing angle expansion film is affixed onto the upper polarizer, then the chroma viewing angle is enhanced, but the contrast ratio is reduced
Solution Approach 1:
The enhancement layer with light diffusion agents provides localized optical modification that selectively affects oblique viewing angles. The controlled diffusion within the layer enhances color consistency across viewing angles without the excessive scattering that would degrade contrast ratio, achieving local optimization of viewing properties while preserving overall image quality and contrast.
Solution Approach 2:
The composite material formulation with specific resin matrices and light diffusion agents enables selective light manipulation. The resin matrix (UV-curable or epoxy) combined with controlled amounts of diffusion agents (0.1-10 wt% Teflon particles or hollow glass beads) creates a material that enhances chroma viewing angle while maintaining sufficient light transmission and contrast ratio, avoiding the trade-off present in conventional single-material approaches.
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 solution effectively expands the chroma viewing angle of liquid crystal display devices while maintaining brightness and contrast, improving the overall performance without the trade-offs of conventional methods.
Implementation Method 1
the light diffusion agent is aligned in the chroma viewing angle enhancement layer, an acute angle is formed between a long axis direction of the light diffusion agent and bottom surface of the chroma viewing angle enhancement layer
Data Source
AI summary
A polarizer and a liquid crystal display device are disclosed. The polarizer includes a first protection film, a polarization layer, a second protection film, a chroma viewing angle enhancement layer, and a surface protection film laminated. Material of the chroma viewing angle enhancement layer includes a resin composite. The resin composite includes a light diffusion agent. The light diffusion agent is aligned in the chroma viewing angle enhancement layer, an acute angle is defined between a long axis direction of light diffusion agent and a bottom surface of the chroma viewing angle enhancement layer, and the acute angle is greater than 0° and is less than or equal to 40°.