Polarizer with Multi-Region Retardation for OLED Color Cast
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Solution Overview
Problem
Conventional polarizers for OLED display devices often fail to achieve quarter-phase retardation for light of all wavelengths, leading to color cast issues due to differential absorption of red, green, and blue light, resulting in reduced contrast and visibility.
Innovation Solution
A polarizer comprising an optical retardation layer with multiple retardation regions, each performing quarter-phase retardation on specific wavelengths of light, allowing for balanced absorption of different colors by varying phase retardation amounts and refractive index differences, laminated with a linear polarization layer to optimize light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional single-type optical retardation layer is used, then the structure is simple, but quarter-phase retardation cannot be achieved for all wavelengths of light, causing color cast
Solution Approach 1:
The optical retardation layer is segmented into multiple retardation regions with different phase retardation amounts. Each region is designed to provide quarter-phase retardation for specific wavelength ranges, collectively covering the entire visible spectrum. This segmentation resolves the contradiction by dividing the complex function of broadband quarter-wave retardation into manageable regional components.
Solution Approach 2:
Different regions of the optical retardation layer are assigned different local optical properties (phase retardation amounts) tailored to specific wavelength ranges. The first, second, and third retardation regions have distinct phase retardation characteristics optimized for their respective spectral regions, enabling precise wavelength-selective quarter-phase retardation while maintaining overall structural coherence.
2Manufacturing precision
If multiple retardation regions with different phase retardation amounts are used, then color cast is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs parameter changes by varying the phase retardation amounts across different regions while maintaining consistent layer thickness. This allows precise control over optical properties for different wavelengths without requiring complex multi-layer structures, thereby improving color cast control while keeping the manufacturing process relatively straightforward.
Solution Approach 2:
The optical retardation layer functions as a composite structure with multiple retardation regions having different optical parameters. This composite approach enables the layer to simultaneously provide quarter-phase retardation across multiple wavelength ranges, achieving superior color cast control through the synergistic combination of regions with complementary optical characteristics.
3Ease of manufacture
If the optical retardation layer uses uniform thickness, then manufacturing is easier, but different phase retardation amounts for different colors become difficult to achieve
Solution Approach 1:
While maintaining uniform layer thickness for ease of manufacture, the patent implements local quality by varying the phase retardation amounts within different regions through controlled changes in refractive index or molecular orientation. This allows precise control of optical properties for different wavelengths without compromising manufacturing simplicity.
Solution Approach 2:
The patent achieves different phase retardation amounts with uniform thickness by changing optical parameters such as refractive index or birefringence within each region. This parameter variation enables precise phase control for different colors while maintaining consistent physical dimensions, resolving the contradiction between manufacturing ease and precision.
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 absorbs light of multiple colors, improving color cast and contrast in OLED display devices by ensuring quarter-phase retardation across various wavelengths, thereby enhancing visibility and reducing external light reflection.
Implementation Method 1
the optical retardation layer includes at least two types of retardation regions for performing phase retardation on incident light, a phase retardation amount of each type of the retardation regions including a quarter of a wavelength of light of one color
Implementation Method 2
The polarizer is configured to absorb external light to avoid an impact of the external light on a display effect of the OLED display panel
Data Source
AI summary
Disclosed are a polarizer, a method for manufacturing the same, and a display device. The polarizer includes an optical retardation layer and a linear polarization layer which are laminated, wherein the optical retardation layer includes at least two types of retardation regions for performing phase retardation on incident light, a phase retardation amount of each type of retardation region including a quarter of a wavelength of light of one color, and the phase retardation amounts of the at least two types of retardation regions including quarters of wavelengths of light of at least two different colors. The present disclosure is favorable to improving the color cast of the display device.