Refractive Layer in Display Encapsulation for Light Extraction
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Solution Overview
Problem
Display devices face reduced light emission efficiency due to protective and functional layers, which hinder the effective output of colored light.
Innovation Solution
A display device design incorporating a display area with a light-emitting display element, an encapsulation layer including a first organic layer and a refractive layer, and a light-shielding layer with a color filter, optimized to enhance light emission efficiency by structuring the refractive index and layer positions for improved light path alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encapsulation layers and functional layers are added to protect display elements, then reliability is improved, but light emission efficiency deteriorates
Solution Approach 1:
The patent changes the refractive index parameter of the encapsulation layer by introducing a refractive layer with a higher refractive index than the organic layer. This parameter change optimizes light extraction efficiency by reducing total internal reflection at the interface, thereby improving light emission efficiency while maintaining the protective function of the encapsulation layer.
Solution Approach 2:
The refractive layer acts as an intermediary between the organic layer and the upper encapsulation layers. It mediates the optical properties by providing a gradual transition in refractive index, which facilitates light extraction and reduces the harmful effect of multiple layer interfaces on light emission efficiency.
2Adaptability or versatility
If multiple layers are added to the display structure, then functionality is improved, but device complexity increases
Solution Approach 1:
The refractive layer is designed to perform multiple functions: it provides optical optimization for light extraction, serves as part of the encapsulation structure for protection, and can be integrated with existing manufacturing processes. This multi-functionality reduces the need for separate dedicated layers, thereby managing complexity while enhancing functionality.
3Illumination intensity
If refractive layer is positioned further from display element, then light path alignment is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the vertical positioning of the refractive layer within the encapsulation structure. By carefully selecting the depth and thickness of the refractive layer in the vertical dimension, the design achieves effective light path alignment and enhanced light extraction efficiency. This dimensional optimization balances optical performance with manufacturing feasibility, as the refractive layer can be positioned at standard fabrication depths.
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 significantly improves light emission efficiency by concentrating and directing light emitted from the display elements, enhancing image quality and reducing manufacturing costs through simplified processes.
Implementation Method 1
The encapsulation layer includes: a first organic layer having a refractive index, a first opening defined in the first organic layer and corresponding to the light emission layer of the display element, and a first refractive layer covering the first organic layer
Data Source
AI summary
A display device includes: a display area; a display element which emits light and includes a pixel electrode, an opposite electrode, and a light emission layer between the pixel electrode and the opposite electrode; an encapsulation layer covering the display element; sensing electrodes disposed on the encapsulation layer; and a light-shielding layer disposed on each of the sensing electrodes to correspond to each of the sensing electrodes. The encapsulation layer includes: a first organic layer having a refractive index, a first opening defined in the first organic layer and corresponding to the light emission layer of the display element, and a first refractive layer covering the first organic layer.