Optical Functional Layer Refractive Index for Display Light Extraction
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Solution Overview
Problem
Conventional display apparatuses suffer from reduced light emission efficiency due to elements added for protection or functionality, which deteriorate the light emitted by display elements.
Innovation Solution
A display apparatus design featuring a substrate with a display element, an organic layer, an optical functional layer, and an input sensing layer, where the optical functional layer includes a refractive index greater than the organic layer, and an anti-reflective layer with a light shielding layer and color filter, enhancing light emission efficiency and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elements for protecting display elements or adding functions are arranged on the display elements, then protection and functionality are improved, but light emission efficiency deteriorates
Solution Approach 1:
An optical functional layer with a refractive index of 1.6 or more is introduced as an intermediary between the display element and the input sensing layer. This layer acts as a mediator to improve light extraction efficiency by reducing reflection at the interface, thereby recovering light that would otherwise be lost while maintaining the protective and functional elements on the display surface.
2Loss of energy
If multiple layers with different refractive indices are configured, then light extraction efficiency is improved, but structural complexity increases
Solution Approach 1:
The optical functional layer utilizes a specific refractive index parameter (1.6 or more) to optimize light extraction efficiency. By carefully selecting and controlling the refractive index parameter of this single layer, the patent achieves improved light extraction without introducing multiple complex layers, thus balancing performance improvement with structural simplicity.
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 improves light emission efficiency and image quality by optimizing the refractive indices and layer configurations, reducing reflectance and enhancing light extraction, while maintaining structural integrity and functionality.
Implementation Method 1
an optical functional layer on the organic layer, the optical functional layer including a first layer defining a first opening corresponding to the emission area, and a second layer on the first layer and having a refractive index greater than that of the first layer
Data Source
AI summary
A display apparatus includes a substrate, in order from the substrate a display element including an emission area and a non-emission area, an input sensing layer including a first insulating layer corresponding to the non-emission area and defining a first opening corresponding to the emission area, and an optical functional layer including in order from the substrate a first layer having a refractive index, corresponding to the non-emission area and defining a second opening corresponding to the emission area, and a second layer facing the first layer, having a refractive index greater than the refractive index of the first layer and extending to the emission area, and an organic layer corresponding to the emission area. At the emission area, the second layer of the optical functional layer is directly on an upper surface of the organic layer which is closest to the optical functional layer.