Display Refractive-Index Adhesive Stack for Impact-Resistant Light Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in achieving both impact resistance and improved light output efficiency, particularly in electronic devices like smartphones and tablets.
Innovation Solution
A display device design incorporating a light control layer with multiple adhesive layers of varying refractive indices and an organic pattern with specific angles and thicknesses, enhancing impact resistance and light output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single adhesive layer is used, then the structure is simple, but the light output efficiency is insufficient
Solution Approach 1:
The adhesive layer is divided into three distinct layers with different refractive indices. The first adhesive layer has a first refractive index, the second adhesive layer has a second refractive index, and the third adhesive layer has a third refractive index. This segmentation allows each layer to contribute differently to light extraction efficiency while maintaining overall structural integrity.
Solution Approach 2:
The patent uses a composite adhesive layer structure combining multiple materials with different refractive indices. This composite approach enables the system to achieve superior light extraction efficiency that cannot be obtained with a single homogeneous material, while the adhesive layers collectively provide the necessary bonding functionality.
2Strength
If the organic pattern thickness is increased, then the impact resistance is improved, but the light transmission is reduced
Solution Approach 1:
The organic pattern thickness is precisely controlled within the range of 2.0 μm to 3.5 μm, and the adhesive layer thicknesses are optimized to specific ranges (first adhesive layer: 1 μm to 5 μm, second adhesive layer: 3 μm to 25 μm, third adhesive layer: 25 μm to 200 μm). These parameter optimizations balance the mechanical strength needed for impact resistance with the optical transparency required for light transmission.
Solution Approach 2:
The inner side surface of the organic pattern is designed with an inclination angle of 45° to 80° relative to the bottom surface, creating local geometric features that enhance both mechanical durability and optical performance. This local geometric modification allows the structure to withstand impacts while maintaining adequate light transmission paths.
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 design provides improved impact resistance and increased light output efficiency by optimizing the light path through the use of adhesive layers with controlled refractive indices and angles, absorbing external impacts effectively.
Implementation Method 1
a first adhesive layer which covers the organic pattern and has a lower refractive index than the organic pattern, a second adhesive layer which is disposed on the first adhesive layer and has a higher refractive index than the first adhesive layer, and a third adhesive layer which is disposed on the second adhesive layer and has a lower refractive index than the second adhesive layer
Data Source
AI summary
A display device includes a display panel including light emitting regions, in which light emitting elements are respectively disposed, and a non-light emitting region adjacent to the light emitting regions and a light control layer including an organic pattern in which pattern openings, which overlap the non-light emitting region and respectively correspond to the light emitting regions, are defined, a first adhesive layer which covers the organic pattern and has a lower refractive index than the organic pattern, a second adhesive layer which is disposed on the first adhesive layer and has a higher refractive index than the first adhesive layer, and a third adhesive layer which is disposed on the second adhesive layer and has a lower refractive index than the second adhesive layer.