Three-Layer Phase Difference Film with Chiral Liquid Crystal
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Solution Overview
Problem
Existing phase difference films used in display devices and liquid crystal displays often exhibit poor anti-reflection and optical compensation effects, affecting the overall performance of these films.
Innovation Solution
A phase difference film comprising three sequentially stacked film layers: a spiral A film formed by adding a chiral agent to a positive dispersion type rod-shaped liquid crystal, a C film formed by a positive dispersion type rod-shaped liquid crystal, and another spiral A film. The film layers are designed to enhance the phase difference and polarization properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional phase difference film structure is used, then the manufacturing process is simple, but the anti-reflection and optical compensation effects are poor
Solution Approach 1:
The phase difference film is divided into three distinct film layers with different liquid crystal orientations: a first film layer with horizontal alignment, a second film layer with vertical alignment, and a third film layer with horizontal alignment. Each layer has specific thickness requirements (first layer: 50-200μm, second layer: 200-500μm, third layer: 50-200μm) to achieve optimal optical compensation and anti-reflection effects through the segmented structure.
Solution Approach 2:
Different regions of the film have different liquid crystal alignment characteristics tailored to specific functions. The first and third film layers use horizontal alignment for phase difference control, while the second film layer uses vertical alignment for optical compensation. This local differentiation of optical properties enhances overall film performance.
2Reliability
If a conventional phase difference film structure is used, then the device complexity is low, but the optical compensation effect is poor
Solution Approach 1:
The film is segmented into three layers with distinct vertical and horizontal alignment characteristics. The second film layer with vertical alignment (200-500μm thickness) provides optical compensation, while the first and third layers with horizontal alignment (50-200μm each) provide phase difference control, achieving comprehensive optical performance enhancement.
Solution Approach 2:
The phase difference film combines multiple liquid crystal materials with different alignment properties in a composite structure. The composite of horizontally aligned liquid crystal layers and vertically aligned liquid crystal layers creates synergistic optical compensation and anti-reflection effects that neither layer could achieve alone.
3Illumination intensity
If the film layers are optimized for better anti-reflection effect, then the light transmittance is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The film structure is segmented into three layers with specified thickness ranges (first layer: 50-200μm, second layer: 200-500μm, third layer: 50-200μm). This segmentation allows each layer to be optimized for its specific function while providing clear manufacturing specifications that guide precision control during production.
Solution Approach 2:
The invention specifies precise thickness parameters for each film layer to optimize optical performance. By controlling the thickness of each layer within defined ranges, the patent achieves optimal light transmittance and anti-reflection effects while providing clear manufacturing targets for quality control.
4Reliability
If a simple film structure is used, then the manufacturing is easier, but the polarization state control is insufficient
Solution Approach 1:
The film is segmented into three layers with distinct polarization functions. The first and third horizontal alignment layers control the polarization state through phase difference, while the second vertical alignment layer provides optical compensation. This segmentation enables precise polarization control while maintaining a relatively simple three-layer manufacturing structure.
Solution Approach 2:
The three-layer film structure serves multiple functions simultaneously: phase difference control, optical compensation, and polarization state management. This multi-functionality is achieved within a unified three-layer architecture that can be manufactured using standard liquid crystal film production techniques.
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 phase difference film achieves improved anti-reflection and optical compensation effects, ensuring better performance by rotating the polarization state of light to near the pole, resulting in enhanced transmittance and reduced light leakage.
Implementation Method 1
a first film layer which is a spiral A film formed by adding a chiral agent into a positive dispersion type rod-shaped liquid crystal
Implementation Method 2
rotating the polarization state of light to near the pole
Implementation Method 3
a phase difference film having aeolotropic refractive index
Implementation Method 4
The film layers are designed to enhance the phase difference and polarization properties
Implementation Method 5
unpolarized light in a visible light wave band can be incident from the POL side at different angles and is close to circularly polarized light when the unpolarized light passes through the phase difference film
Data Source
AI summary
The present application discloses a phase difference film, a polymerizable composition and a method for preparing the phase difference film, and relates to the field of optical materials. A phase difference film comprises a first film layer, a second film layer and a third film layer which are sequentially stacked, wherein the first film layer is a spiral A film formed by adding a chiral agent into a positive dispersion type rod-shaped liquid crystal; the second film layer is a C film formed by a positive dispersion type rod-shaped liquid crystal; the third film layer is a spiral A film formed by adding a chiral agent into a positive dispersion type rod-shaped liquid crystal. According to the present application, the problems of poor performance of the phase difference film and the like in the related art can be solved.