Wrinkled Phase Retardation Layer for Low-Reflection Displays
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Solution Overview
Problem
Existing display devices face challenges in reducing external light reflection, improving light emission efficiency, and minimizing color shift issues, particularly in viewing angle characteristics.
Innovation Solution
A display device with a phase retardation layer comprising a first layer with a controlled curing degree and wrinkle structure, a second layer of inorganic material, and a third polarizer layer, where the first and second layers have matching wrinkle structures to enhance light scattering and reduce color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional phase retardation layer with flat surfaces is used, then the structure is simple and easy to manufacture, but external light reflection increases and viewing angle characteristics deteriorate
Solution Approach 1:
The patent applies curvature by forming wrinkle structures on the surfaces of the phase retardation layer. The first surface has first wrinkles and the second surface has second wrinkles, replacing flat surfaces with curved/undulated surfaces. This curvature scatters external light effectively, reducing reflection and improving viewing angle characteristics without significantly complicating the manufacturing process.
2Use of energy by moving object
If the phase retardation layer uses a single-layer structure, then the manufacturing process is simple, but light emission efficiency and viewing angle characteristics are insufficient
Solution Approach 1:
The phase retardation layer is segmented into multiple distinct layers: a first phase retardation layer with specific optical compensation properties and a second phase retardation layer with different optical properties. This segmentation allows each layer to perform specific optical functions, improving overall light emission efficiency and viewing angle characteristics while maintaining a manageable manufacturing process.
3Stability of the object's composition
If the first layer is fully cured (100% curing degree), then the structural stability is high, but wrinkle structure formation is suppressed and color shift occurs
Solution Approach 1:
The patent optimizes the curing degree parameter of the first phase retardation layer to a specific range (70% to 90%, preferably 80% to 90%). This partial curing state maintains sufficient structural stability while preserving the material's flexibility to form and maintain wrinkle structures. This parameter optimization prevents color shift by ensuring proper wrinkle formation while avoiding complete curing that would suppress wrinkle development.
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 reduces external light reflection, enhances light emission efficiency, and improves viewing angle characteristics by controlling the curing degree and wrinkle structures of the first and second layers.
Implementation Method 1
An upper surface of the first layer has a first wrinkle structure and contacts a lower surface of the second layer
Implementation Method 2
the first layer and the second layer have matching wrinkle structures to enhance light scattering and reduce color shift
Data Source
AI summary
A display device may include a display layer and a phase retardation layer disposed on the display layer. The phase retardation layer includes a first layer including a phase retarder, a second layer disposed on the first layer and including an inorganic material, and a third layer disposed on the second layer and including a polarizer. An upper surface of the first layer has a first wrinkle structure and contacts a lower surface of the second layer. An upper surface of the second layer has a second wrinkle structure and contacts a lower surface of the third layer.