Optical Pattern Layer for Display Devices
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Solution Overview
Problem
Display devices experience a degradation in display quality due to the color difference phenomenon when viewed from different angles, which existing technologies have not adequately addressed without compromising front efficiency.
Innovation Solution
A display device is designed with an optical pattern layer having a first pattern layer with a higher refractive index and a second pattern layer with a lower refractive index, featuring protruding parts with specific dimensions and angles, disposed on a light emitting element layer to optimize light scattering and minimize efficiency reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical pattern layer is added to improve viewing angle and reduce color difference, then display quality at side viewing angle is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The optical pattern layer is divided into multiple layers with different refractive indices (first pattern layer with higher refractive index and second pattern layer with lower refractive index). Each layer serves a specific function in controlling light propagation, allowing the system to achieve superior viewing angle performance through coordinated action of segmented components rather than a single complex structure
Solution Approach 2:
The optical pattern layer incorporates protruding parts with specific geometric features (inclination angles of 70°-90°, heights of 7-15 μm, bottom surface widths of 4-10 μm) that create localized optical effects. These structurally distinct regions modify light scattering and refraction properties at specific locations to optimize overall display quality without requiring uniform complexity throughout the entire structure
2Illumination intensity
If protruding parts with specific dimensions are used to optimize light scattering, then color difference is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies optimized parameter ranges for protruding parts (inclination angles of 70°-90°, heights of 7-15 μm, bottom surface widths of 4-10 μm) that balance optical performance with manufacturability. These parameter ranges are designed to achieve effective light scattering and color difference reduction while remaining feasible for conventional manufacturing processes, avoiding overly stringent precision requirements
3Productivity
If a multi-layer optical pattern structure is implemented to maintain front efficiency, then light scattering is optimized, but device complexity increases
Solution Approach 1:
The optical pattern layer uses a composite multi-layer structure where the first pattern layer (higher refractive index) and second pattern layer (lower refractive index) work together to optimize light scattering while maintaining front viewing efficiency. The composite structure leverages the complementary optical properties of different materials/layers to achieve superior performance that neither layer could provide alone, justifying the increased structural complexity
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 improves display quality by reducing color differences when viewed from the side while maintaining front efficiency, through optimized light scattering and refractive index differences in the optical pattern layer.
Implementation Method 1
an optical pattern layer disposed on the light emitting element layer. The optical pattern layer may include a first pattern layer having a first refractive index and including a base part and protruding parts spaced apart from each other on the base part; and a second pattern layer disposed on the first pattern layer and having a second refractive index less than the first refractive index
Implementation Method 2
a first pattern layer having a first refractive index and including a base part and protruding parts spaced apart from each other on the base part; and a second pattern layer disposed on the first pattern layer and having a second refractive index less than the first refractive index
Data Source
AI summary
A display device includes a light emitting element layer, and an optical pattern layer disposed on the light emitting element layer. The optical pattern layer includes a first pattern layer having a base part and protruding parts, and a second pattern layer having a refractive index less than a refractive index of the first pattern layer to scatter light incident to the optical pattern layer and minimize reduction in front efficiency, thereby providing an improved display quality of a side viewing angle.