Light-Emitting Display Layers for External Reflection Reduction
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Solution Overview
Problem
Existing display apparatuses suffer from reduced visibility due to external light reflection.
Innovation Solution
Incorporation of a low-reflection layer and a reflection control layer on the light-emitting element, utilizing inorganic materials that absorb specific wavelength bands of light, along with a light blocking layer and encapsulation member to enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a low-reflection layer and reflection control layer are added to reduce external light reflection, then visibility is improved, but device complexity increases
Solution Approach 1:
The anti-reflection function is segmented into two distinct layers: a low-reflection layer with inorganic materials for broad-spectrum reflection reduction, and a reflection control layer with light-absorbing materials for specific wavelength band control. This segmentation allows each layer to specialize in different aspects of reflection management, achieving comprehensive visibility improvement while maintaining manageable structural complexity
Solution Approach 2:
The patent employs composite materials in both layers: the low-reflection layer combines inorganic materials with specific refractive indices, while the reflection control layer integrates multiple light-absorbing materials targeting different wavelength bands. These composite material approaches enable sophisticated optical control properties that single materials cannot achieve, resolving the contradiction between performance and complexity
2Object-affected harmful factors
If light-absorbing materials are used in the reflection control layer to absorb specific wavelength bands, then visibility is improved, but luminescence efficiency may be affected
Solution Approach 1:
The reflection control layer uses light-absorbing materials with specific absorption characteristics tailored to target harmful external light wavelength bands while being transparent or minimally absorbing in the visible emission ranges of the display. This local quality approach ensures that light absorption is applied selectively where needed (in harmful external light bands) while preserving luminescence efficiency in the display's emission bands
Solution Approach 2:
The patent carefully selects and adjusts parameters of the light-absorbing materials, including their absorption spectra, concentration levels, and layer thickness, to optimize the balance between external light rejection and internal luminescence transmission. By controlling these parameters, the system achieves high visibility improvement while maintaining acceptable luminescence efficiency
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
Improves visibility by reducing external light reflection and maintaining luminescence efficiency across different wavelength bands.
Implementation Method 1
a reflection control layer on the light-emitting element, the reflection control layer being configured to absorb light in at least three wavelength bands
Implementation Method 2
the low-reflection layer including an inorganic material, the inorganic material having a refractive index of 1 or greater
Data Source
AI summary
A display apparatus includes: a substrate; a light-emitting element on the substrate; a low-reflection layer on the light-emitting element and including an inorganic material; and a reflection control layer on the low-reflection layer and configured to absorb light in at least three wavelength bands selected from a first wavelength band of 430 nm or less, a second wavelength band of 480 nm to 510 nm, a third wavelength band of 575 nm to 605 nm, and a fourth wavelength band of 650 nm or greater.