Polarization Film Stack for Neutral Black Display Reflection
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving optimal anti-reflection and reflection chroma characteristics due to variations in polarization states across different wavelengths, leading to color shifts and uneven reflection patterns.
Innovation Solution
A polarization film comprising a polarization layer, a first light compensation film with a positive A plate, and a second light compensation film with a positive C plate, where the difference in extraordinary refractive indices (ne(+C)−ne(+A)) is carefully controlled across wavelengths to stabilize polarization states, using quarter-wave plates and liquid crystal molecules to adjust phase differences and minimize color shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional polarization film is used, then the basic polarization function is provided, but color shifts and uneven reflection patterns occur due to variations in polarization states across different wavelengths
Solution Approach 1:
The patent divides the light compensation function into multiple films: a first light compensation film (positive A plate) and a second light compensation film (positive C plate). Each film targets specific wavelength ranges, with the first film addressing blue/violet light compensation and the second film addressing red light compensation. This segmentation allows independent optimization of polarization state control for different wavelengths, resolving the contradiction between maintaining polarization consistency and preventing color shifts.
Solution Approach 2:
The patent applies different light compensation characteristics to different regions of the visible spectrum. The first light compensation film is optimized for shorter wavelengths (blue/violet) while the second light compensation film is optimized for longer wavelengths (red). By assigning specific functional qualities to specific wavelength regions, the patent achieves uniform polarization state control across the entire visible range without introducing color shifts.
2Reliability
If light compensation films are added to correct polarization states, then reflection chroma characteristics improve, but device complexity increases
Solution Approach 1:
The patent segments the light compensation function across two distinct films rather than using a single complex film. The first light compensation film (positive A plate) handles blue/violet light compensation while the second light compensation film (positive C plate) handles red light compensation. This segmentation simplifies the design compared to a single multi-functional film, as each film can be independently manufactured and optimized for its specific wavelength range.
Solution Approach 2:
The patent utilizes parameter changes in the extraordinary refractive indices of the light compensation films to achieve the desired polarization control. By carefully selecting materials with specific refractive index characteristics (ne(+A) and ne(+C) values) and controlling the thickness of each film, the patent achieves precise control over the polarization state for different wavelengths. This parameter-based approach allows for optimized performance with relatively simple film structures.
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 results in a polarization film that maintains consistent polarization states across various wavelengths, reducing color shifts and achieving neutral black reflection, thereby enhancing the anti-reflection and reflection chroma characteristics.
Implementation Method 1
a first light compensation film arranged on one side of the polarization layer and including a positive A plate; and a second light compensation film arranged on one side of the first light compensation film and including a positive C plate, where a value of ne(+C)−ne(+A) is positive at a wavelength of 450 nanometers (nm) and negative at a wavelength of 650 nm
Implementation Method 2
ne(+A) denotes an extraordinary refractive index of the first light compensation film and ne(+C) denotes an extraordinary refractive index of the second light compensation film
Implementation Method 3
using quarter-wave plates and liquid crystal molecules to adjust phase differences and minimize color shifts
Implementation Method 4
The second light compensation film may include liquid crystal molecules
Implementation Method 5
a polarization layer; a first light compensation film arranged on one side of the polarization layer
Data Source
AI summary
A polarization film includes: a polarization layer; a first light compensation film arranged on one side of the polarization layer and including a positive A plate; and a second light compensation film arranged on one side of the first light compensation film and including a positive C plate. A value of ne(+C)−ne(+A) is positive at a wavelength of 450 nm and negative at a wavelength of 650 nm. Here, ne(+A) denotes an extraordinary refractive index of the first light compensation film and ne(+C) denotes an extraordinary refractive index of the second light compensation film.