Inorganic Deposition Layer for Display Light Reflection
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Solution Overview
Problem
Display devices face challenges in suppressing the reflection of external light, particularly from the cathode electrode, which affects user experience and image clarity.
Innovation Solution
A display device structure incorporating a substrate, first and second electrodes, a light emitting layer, an inorganic deposition layer with specific materials like silver, magnesium, or bismuth, and a thin film encapsulation layer, along with an anti-reflection member, is designed to minimize external light reflection by canceling out reflected light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an inorganic deposition layer is formed on the cathode electrode to reduce external light reflection, then the image clarity is improved, but the device complexity increases
Solution Approach 1:
The patent applies composite materials by forming an inorganic deposition layer containing multiple materials (silver, magnesium, manganese, bismuth, ytterbium, zinc, tellurium, or selenium) on the cathode electrode. This composite inorganic layer works synergistically to reduce external light reflection while maintaining device functionality, resolving the contradiction between improving image clarity and increasing device complexity.
Solution Approach 2:
The patent utilizes parameter changes by controlling the absorption coefficient (k) of the inorganic deposition layer to be less than about 4 at a wavelength of about 550 nm. By optimizing this specific parameter, the layer effectively reduces external light reflection while maintaining appropriate optical properties, thus improving image clarity without excessive complexity.
2Object-affected harmful factors
If multiple inorganic deposition layers are used to enhance reflection suppression, then the external light reflection is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the inorganic deposition layer into multiple distinct layers (N inorganic deposition layers where N ≥ 1), each potentially containing different materials from the specified group. This segmented approach allows each layer to contribute differently to reflection suppression, enhancing effectiveness while maintaining manageable manufacturing complexity through modular construction.
3Manufacturing precision
If an inorganic deposition layer with specific absorption coefficient is formed, then the image clarity is enhanced, but the material selection complexity increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the absorption coefficient (k) to be less than about 4 at a wavelength of about 550 nm. This specific parameter control ensures optimal reflection suppression while providing clear manufacturing criteria, thereby enhancing image clarity without excessive material selection complexity.
Solution Approach 2:
The patent uses composite materials with specific optical properties by selecting from a defined group of elements (silver, magnesium, manganese, bismuth, ytterbium, zinc, tellurium, or selenium). These materials are chosen for their complementary optical characteristics that collectively achieve the desired absorption coefficient, balancing manufacturing precision requirements with material composition complexity.
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 effectively reduces external light reflection, enhancing image clarity and user experience by minimizing visible light interference from the cathode electrode.
Implementation Method 1
at a wavelength of about 550 nm, an absorption coefficient (k) of the inorganic deposition layer is less than about 4
Data Source
AI summary
A display device includes: a substrate; a first electrode on the substrate; a bank layer partially exposing a top surface of the first electrode; a light emitting layer disposed on the partially exposed top surface of the first electrode; a second electrode on the light emitting layer and the bank layer; an inorganic deposition layer on the second electrode; and a thin film encapsulation layer on the inorganic deposition layer, where at a wavelength of about 550 nm, an absorption coefficient (k) of the inorganic deposition layer is less than about 4.