Polarizer with Oriented Light-Diffusing Particles for Display Contrast
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Solution Overview
Problem
The addition of an optical film to enhance the chromaticity viewing angle of display devices increases the thickness of the polarizer, leading to reduced outgoing light emission and deteriorated contrast.
Innovation Solution
A polarizer with a first optical functional layer comprising a substrate and light-diffusing particles, where the substrate has a glass transition temperature ranging from 30° C. to 500° C. and an elastic modulus of 500 MPa to 5000 MPa at 23° C., and the light-diffusing particles are oriented to maintain an average angle difference of less than or equal to 5° between their long axis and the polarizing layer's absorption axis, thereby improving the chromaticity viewing angle without the need for additional film layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical film is added to enlarge the chromaticity viewing angle, then the chromaticity viewing angle is improved, but the thickness of the polarizer increases, outgoing light is reduced, and contrast is deteriorated
Solution Approach 1:
The patent merges the optical film functionality directly into the polarizer structure by forming a first optical functional layer on the polarizing layer. This integration eliminates the need for separate additional film layers, thereby maintaining outgoing light intensity while achieving enlarged chromaticity viewing angle through the combined structure of polarizing layer and optical functional layer
Solution Approach 2:
The first optical functional layer uses a composite structure consisting of a substrate with specific glass transition temperature (30-500°C) and elastic modulus (500-5000 MPa), combined with light-diffusing particles. This composite material approach enables the polarizer to achieve both the optical enhancement for chromaticity viewing angle and maintain adequate light transmission without increasing overall thickness
2Adaptability or versatility
If an optical film is added to enlarge the chromaticity viewing angle, then the chromaticity viewing angle is improved, but the thickness of the polarizer increases
Solution Approach 1:
The patent merges the optical film functionality directly into the polarizer structure by forming a first optical functional layer on the polarizing layer. This integration eliminates the need for separate additional film layers, thereby maintaining polarizer thickness within acceptable limits while achieving enlarged chromaticity viewing angle through the combined structure
Solution Approach 2:
The first optical functional layer is designed as a thin film structure with controlled thickness, using a substrate with specific mechanical properties (elastic modulus 500-5000 MPa). This thin film approach provides the necessary optical functionality for chromaticity viewing angle enhancement without significantly increasing the overall polarizer thickness
3Adaptability or versatility
If an optical film is added to enlarge the chromaticity viewing angle, then the chromaticity viewing angle is improved, but contrast is deteriorated
Solution Approach 1:
The patent merges the optical film functionality directly into the polarizer structure, creating an integrated system where the first optical functional layer works in conjunction with the polarizing layer. This integration optimizes the overall optical performance to maintain contrast while achieving enlarged chromaticity viewing angle
Solution Approach 2:
The substrate of the first optical functional layer is designed with specific parameter ranges: glass transition temperature of 30-500°C and elastic modulus of 500-5000 MPa. By controlling these material parameters, the patent optimizes the optical properties to maintain contrast performance while achieving the chromaticity viewing angle enhancement
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
This configuration enhances the chromaticity viewing angle and reduces light loss, thereby improving the contrast of the display device without increasing the polarizer's thickness.
Implementation Method 1
a first optical functional layer on a side of the polarizing layer, the first optical functional layer includes a substrate and a light-diffusing particle dispersed in the substrate
Data Source
AI summary
Some embodiments of the present application disclose a polarizer and a display device, wherein the polarizer includes a polarizing layer, and a first optical functional layer on a side of the polarizing layer. The first optical functional layer includes a substrate and light-diffusing particles dispersed in the substrate. An average value of a difference between an orientation angle of an orthographic projection of a long axis of the light-diffusing particle in a first plane and an orientation angle of an absorption axis of the polarizing layer in the first plane is less than or equal to 5°.