Display Optical Pattern With Intermediate Insulating Layer
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Solution Overview
Problem
Display apparatuses face challenges in achieving a narrow viewing angle and improving image quality due to the use of light control films, which can cause Moire patterns and reduce frontal luminance.
Innovation Solution
A display apparatus design featuring a light-emitting device with an encapsulating element, an optical pattern, and an intermediate insulating layer with a refractive index lower than the optical pattern, along with a touch electrode structure that restricts light travel, enhancing light extraction efficiency and frontal luminance while preventing color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a light control film is attached to the top layer of the display apparatus to restrict light travelling direction, then a narrow viewing angle is achieved, but Moire patterns occur and image quality decreases
Solution Approach 1:
The patent removes the light control film from the display apparatus structure. Instead of attaching a separate light control film layer, the invention uses the inherent properties of the light-emitting device structure and encapsulating element to achieve narrow viewing angle without Moire patterns. The light control function is integrated into the device structure itself rather than added as a separate film layer.
Solution Approach 2:
The patent introduces an intermediate insulating layer with specific refractive index properties as a mediator between the optical pattern and the touch electrode. This intermediate layer controls light propagation and prevents harmful optical interference while enabling the touch structure to function properly. The intermediate insulating layer acts as an optical mediator that manages light paths without causing Moire patterns.
2Shape
If a light control film is used to restrict light travelling direction, then viewing angle is narrowed, but frontal luminance is reduced
Solution Approach 1:
The patent eliminates the light control film that was causing frontal luminance loss. By removing this problematic layer and using the encapsulating element and intermediate insulating layer instead, the design maintains narrow viewing angle while preserving frontal luminance through better light extraction and transmission paths.
Solution Approach 2:
The patent changes the optical parameters of the intermediate insulating layer by selecting materials with specific refractive indices (lower than the optical pattern but higher than air). This parameter optimization allows the intermediate layer to control light directions effectively while maintaining high frontal luminance output.
3Productivity
If the horizontal width of the optical pattern is decreased as distance from encapsulating element increases, then light extraction efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the optical pattern dimensions by controlling the horizontal width to decrease linearly with distance from the encapsulating element. This parameter relationship (width proportional to distance) provides a clear manufacturing guideline that balances light extraction efficiency with manufacturability. The linear relationship simplifies precision requirements compared to more complex geometric relationships.
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 restricts the viewing angle, improves image quality, and increases frontal luminance by controlling light emission and reflection within the display apparatus, minimizing light scattering and color mixing.
Implementation Method 1
The refractive index of the intermediate insulating layer may be smaller than the refractive index of the optical pattern
Implementation Method 2
The optical pattern may include an organic insulating material... A side of the optical pattern may have a convex shape toward the outside of the optical pattern
Data Source
AI summary
A display apparatus having a light-emitting device and a touch electrode is provided. An optical pattern may be disposed on the light-emitting device. A side of the optical pattern may be sloped. A surface of the optical pattern opposite to the light-emitting device may be covered by an intermediate insulating layer. The intermediate insulating layer may be harder than the optical pattern. The touch electrode may overlap the side of the optical pattern. Thus, in the display apparatus, the surface defect of the optical pattern in the forming process of the touch electrode may be prevented. Therefore, in the display apparatus, the frontal luminance and the image quality may be improved.