Display Device Low Refraction Layer Asymmetric Opening Design
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Solution Overview
Problem
Display devices suffer from reduced light output efficiency and display quality due to undesirable light reflection at interlayer interfaces, which affects the overall performance of the device.
Innovation Solution
The implementation of a display device structure that includes a substrate with a transistor, a first electrode, a pixel defining layer, an emission layer, a second electrode, a touch electrode, and low and high refractive layers, where the low refractive layers have different openings and refractive indices, and the high refractive layer is positioned on top of the second low refractive layer, optimizing light reflection and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multilayer structure with light-emitting device and touch sensor is stacked on substrate, then device functionality is improved, but light reflection at interlayer interfaces increases reducing light output efficiency
Solution Approach 1:
A low refractive index layer is introduced as an intermediary between the touch electrode and the light-emitting device. This intermediate layer has a refractive index lower than both adjacent layers (touch electrode layer and emission layer), creating a gradient that reduces light reflection at interfaces and improves light output efficiency while maintaining the multilayer functional structure
Solution Approach 2:
The refractive index parameter is strategically varied across different layers. The low refractive index layer (with refractive index of 1.3-1.6) is positioned between layers with higher refractive indices to create an optimal optical path, minimizing reflection losses without compromising the electrical and mechanical functionality of the multilayer structure
2Loss of energy
If low refraction layer is added between touch electrode and emission layer, then light output efficiency is improved, but device structure complexity increases
Solution Approach 1:
The low refractive index layer serves multiple functions simultaneously: it acts as an optical intermediary to reduce reflection, provides electrical insulation between the touch electrode and emission layer, and maintains mechanical structural integrity. This multi-functionality allows the single layer to address optical efficiency without proportionally increasing structural complexity
3Loss of energy
If first opening and second opening have different widths in diagonal directions, then light reflection is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The first and second openings are designed with asymmetric dimensions in diagonal directions, where the first opening has different width characteristics than the second opening. This asymmetric design optimizes light reflection control by creating varied optical paths, though it does require precise manufacturing to achieve the specified dimensional tolerances
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
This configuration enhances light output efficiency and display quality by effectively managing light reflection and emission, improving the front-side visibility and overall performance of the display device.
Implementation Method 1
a first low refraction layer and a second low refraction layer overlapping the touch electrode... The first low refraction layer and the second low refraction layer may have different refractive indexes
Implementation Method 2
some of the light generated by the light-emitting device is reflected in an undesirable direction at an interlayer interface of the display device
Data Source
AI summary
A display device includes a substrate; a transistor on the substrate; a first electrode electrically connected to the transistor; a pixel defining layer on the first electrode, the pixel defining layer including a pixel opening overlapping the first electrode; an emission layer and a second electrode overlapping the first electrode; a touch electrode on the second electrode; a first low refraction layer and a second low refraction layer overlapping the touch electrode; and a high refraction layer on the second low refraction layer. The first low refraction layer includes a first opening. The second low refraction layer includes a second opening. The first opening, the second opening, and the pixel opening have different widths in a first diagonal direction.