High-Refractive Insulating Layer for Forward Light Extraction
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Solution Overview
Problem
Self-luminous display devices, such as organic light emitting display devices, suffer from reduced emission efficiency due to light emitted in lateral directions, which affects the overall performance.
Innovation Solution
A display device with a high refractive insulating layer is designed to include a first and second insulating layer with specific refractive indices and openings, and a high refractive index layer that enhances light emission efficiency by controlling light directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional insulating layer structure is used, then the device structure is simple, but light emitted in lateral directions reduces emission efficiency
Solution Approach 1:
The patent applies parameter changes by introducing a high refractive index insulating layer with a refractive index of 1.7 or more, which is significantly higher than conventional insulating layers. This parameter change in refractive index enables effective control of light propagation, directing lateral-emitted light toward the front direction and improving emission efficiency without complicating the overall device structure
Solution Approach 2:
The patent employs composite materials by combining multiple insulating layers with different refractive indices - a first insulating layer, a second insulating layer, and a high refractive index insulating layer. This composite structure creates optical pathways that guide light effectively, resolving the contradiction between structural simplicity and emission efficiency
2Illumination intensity
If light emitting elements emit light in all directions, then the light output is maximized, but emission efficiency decreases due to lateral light emission
Solution Approach 1:
The patent applies local quality by creating regions with different optical properties - the high refractive index insulating layer is positioned specifically over the emission areas to control light direction locally. This allows light to be emitted in all directions from the source while the high refractive index region redirects lateral light toward the front, maximizing both light output and emission efficiency
Solution Approach 2:
The high refractive index insulating layer acts as an intermediary between the light emitting element and the external environment. It mediates the light propagation by refracting and directing light rays, particularly converting lateral-emitted light into forward-directed light, thereby improving emission efficiency while preserving total light output
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 high refractive insulating layer improves emission efficiency by directing light primarily in the forward direction, reducing lateral light emission and enhancing the display's overall performance.
Implementation Method 1
The high refractive insulating layer has a third refractive index that is greater than each of the first and second refractive indexes
Data Source
AI summary
A display device includes a display panel, first and second insulating layers, and a high refractive insulating layer. The display panel includes emission areas and a non-emission area. The first insulating layer is disposed on the display panel, and first openings are defined in the first insulating layer. Second openings, corresponding to the first openings, are defined in the second insulating layer having a refractive index greater than that of the first insulation layer. The high refractive insulating layer has a refractive index greater than that of the second insulating layer. The high refractive insulating layer is disposed on the first and second insulating layers. The first insulating layer includes a first inclined surface defining the first openings, and the second insulating layer includes a second inclined surface defining the second openings. The first inclined surface and the second inclined surface are spaced apart from each other.