Low-Refractive-Index Insulating Layer for Display Light Extraction
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Solution Overview
Problem
Current self-light-emitting display devices, such as organic EL elements, face challenges in achieving high light extraction efficiency, which affects power consumption and overall performance.
Innovation Solution
Incorporating a low-refractive-index layer in the insulating layer of the display device, positioned between the first and second electrodes, enhances light extraction by total reflection of emitted light towards the display surface, improving light extraction efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional insulating layer is used in the display device, then the device structure is simple, but light extraction efficiency is low
Solution Approach 1:
The patent changes the refractive index parameter of the insulating layer by introducing a low-refractive-index layer with refractive index of 1.3 or less, which is lower than the refractive index of the functional layer. This parameter change enables total reflection of light at the interface, significantly improving light extraction efficiency without complicating the device structure
Solution Approach 2:
The insulating layer is constructed as a composite structure comprising a low-refractive-index layer made of specific materials (such as fluorinated polymers, porous silica, or aerogels) combined with the conventional insulating layer. This composite material approach achieves both low refractive index for light extraction and sufficient insulation performance
2Use of energy by stationary object
If light extraction efficiency is improved, then power consumption is reduced, but device complexity increases
Solution Approach 1:
By changing the refractive index parameter to 1.3 or less, the patent achieves total reflection of light at the insulating layer interface, which directs more light toward the display surface. This improves light extraction efficiency and reduces power consumption while maintaining a relatively simple layered structure
Solution Approach 2:
The low-refractive-index layer is strategically positioned at the interface between the insulating layer and the functional layer, where light extraction is most critical. This localized quality change optimizes light extraction at the key interface without requiring modification of the entire device structure
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 use of a low-refractive-index layer in the insulating layer increases the quantity of light reflected and extracted, thereby enhancing light extraction efficiency and minimizing power consumption in self-light-emitting display devices.
Implementation Method 1
the insulating layer includes a low-refractive-index layer, the low-refractive-index layer being made of a material having a lower refractive index than a refractive index of a layer, and the layer being in proximity to the insulating layer and included in the functional layer
Data Source
AI summary
Provided is a display (1) including: an insulating layer (19) having an opening (19M); and a light-emission device (10) including a functional layer (15) and provided in the opening of the insulating layer, the functional layer being provided between a first electrode (14) and a second electrode (16) and including a light emitting layer. The insulating layer includes a low-refractive-index layer, the low-refractive-index layer being made of a material having a lower refractive index than a refractive index of a layer (15A), and the layer (15A) being in proximity to the insulating layer and included in the functional layer.