Display Device Insulating Layers Refractive Index Gradient
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Solution Overview
Problem
The light-outputting efficiency and displaying quality of display devices are compromised due to light reflection at interlayer interfaces, leading to reduced light discharge and inferior front visibility.
Innovation Solution
A display device structure is implemented with multiple insulating layers having different refractive indices, where the first insulating layer has a higher refractive index than the second and third insulating layers, and these layers are strategically positioned to optimize light path and reduce reflections, enhancing light output and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple insulating layers with different refractive indices are added to reduce light reflection, then light-outputting efficiency is improved, but device complexity increases
Solution Approach 1:
The encapsulation layer is segmented into multiple insulating layers (first, second, and third insulating layers) with different refractive indices. Each layer is positioned at specific interfaces where light reflection occurs, creating a gradient structure that systematically addresses reflection problems at different boundaries throughout the display device.
Solution Approach 2:
Each insulating layer is assigned a specific refractive index tailored to its location and function. The first insulating layer (n1) has the highest refractive index to handle reflections at the emission layer interface, the second insulating layer (n2) has an intermediate refractive index for mid-level reflection control, and the third insulating layer (n3) has the lowest refractive index for surface-level reflection management. This localized optimization of optical properties maximizes light output efficiency.
2Illumination intensity
If the refractive index of the first insulating layer is made greater than the third insulating layer to optimize light paths, then light discharge is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent systematically varies the refractive index parameter across the insulating layers, establishing a descending gradient (n1 > n2 > n3). This parameter change strategy optimizes light discharge by creating favorable refraction conditions at each interface, directing more light toward the front surface while minimizing reflections that would otherwise reduce illumination intensity.
Solution Approach 2:
The second insulating layer acts as an intermediary between the first and third insulating layers, with its intermediate refractive index (n2) serving as a transition value. This intermediary layer facilitates smooth optical transitions and reduces abrupt refractive index changes, thereby managing manufacturing precision requirements while maintaining effective light discharge.
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 structure significantly improves light-outputting efficiency and display quality by minimizing light reflections and maximizing light discharge to the front, resulting in enhanced visibility and performance compared to reference examples without these layers.
Implementation Method 1
a refractive index of the first insulating layer, a refractive index of the second insulating layer, and a refractive index of the third insulating layer are different from one another
Data Source
AI summary
A display device includes a substrate, a transistor on the substrate, a pixel electrode connected to the transistor, a bank layer disposed on the pixel electrode and defining a pixel opening overlapping the pixel electrode, an emission layer in the pixel opening, a common electrode on the emission layer and the bank layer, an encapsulation layer on the common electrode, a sensing electrode on the encapsulation layer, a first insulating layer disposed on the encapsulation layer and overlapping the pixel opening, a second insulating layer on the first insulating layer, and a third insulating layer surrounding the first insulating layer. A refractive index of the first insulating layer, a refractive index of the second insulating layer, and a refractive index of the third insulating layer are different from one another, and the refractive index of the first insulating layer is greater than the refractive index of the third insulating layer.