Light Control Layer Structure for Narrow Viewing Angle Displays
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Solution Overview
Problem
Existing display devices struggle to effectively control light extraction direction, leading to limited viewing angles and reduced display quality, particularly in applications where broad viewing angles are not desired.
Innovation Solution
A display device incorporating a light control module with a pattern layer and a light control layer, where the pattern layer includes transmission and light blocking portions that cross each other, and the light control layer, comprising different materials, is positioned to overlap these portions, controlling light extraction direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional display structure is used, then the display device is simple in structure, but the light extraction direction cannot be effectively controlled
Solution Approach 1:
The display structure is segmented into multiple functional layers: a pattern layer with light blocking and transmission portions, and a light control layer with regions of different refractive indices. This segmentation allows independent optimization of each layer's function to achieve precise light direction control while maintaining overall structural organization.
Solution Approach 2:
The light control layer incorporates regions with different refractive indices (first region with higher refractive index, second region with lower refractive index) positioned at specific locations corresponding to light blocking and transmission portions. This local quality variation enables precise control of light extraction direction in different areas of the display.
2Ease of operation
If light extraction is not controlled, then broad viewing angles are achieved, but display quality deteriorates due to image distraction
Solution Approach 1:
Different regions of the light control layer are assigned different refractive indices to locally control light behavior: the first region (higher refractive index) controls light from light blocking portions, while the second region (lower refractive index) controls light from transmission portions, achieving precise viewing angle management.
Solution Approach 2:
The patent utilizes optical property variations (analogous to color changes) by employing materials with different refractive indices to modify light propagation characteristics, enabling control over viewing angles and light extraction efficiency without altering the physical structure dramatically.
3Ease of operation
If the first portion has a higher refractive index, then light extraction direction is controlled effectively, but material selection becomes more restrictive
Solution Approach 1:
The patent controls light extraction by changing the refractive index parameter of materials in different regions. By selecting materials with specific refractive index values (first portion: higher index, second portion: lower index), the system achieves effective light direction control while the parameter-based approach allows flexibility in material selection.
Solution Approach 2:
The light control layer functions as a composite structure combining materials with different refractive indices in specific spatial arrangements. This composite approach enables tailored optical properties in different regions while maintaining versatility in overall material selection and composition.
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 achieves controlled light extraction, limiting viewing angles to enhance display quality and prevent image distraction, while maintaining high frontal luminance.
Implementation Method 1
the first portion may have a greater refractive index than each of the second portion and the transmission portion
Data Source
AI summary
A display device includes a display layer, and a light control layer overlapping a pattern layer, which includes a transmission portion and a light blocking portion, which cross one another in a first direction perpendicular to a thickness direction. The light control layer includes a lower light control layer disposed below the pattern layer and including a first portion overlapping the transmission portion, and a second portion overlapping the light blocking portion and including a material that is different from that of the first portion and/or an upper light control layer disposed above the pattern layer and including a plurality of protrusions protruding in a direction away from the pattern layer.