OLED Sealing Layer Composition for Sunlight Color Uniformity

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Solution Overview

Problem

OLED display devices in vehicles experience significant deviations in light transmittance due to sunlight exposure, leading to color inequality and degraded image quality, particularly in the sealing portions of the display.

Innovation Solution

A display device with a sealing portion comprising a first inorganic layer containing silicon, oxygen, nitrogen, and hydrogen, and optionally additional sub-inorganic layers, is used to minimize light transmittance variations across different sunlight wavelengths. This layer is formed using a chemical vapor deposition process with specific gas flow rates and compositions to achieve optimal refractive indices and composition ratios, ensuring minimal color inequality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional sealing portions are used in OLED displays, then the display can be manufactured with standard materials, but the light transmittance varies significantly across different sunlight wavelengths causing color inequality

Engineering Contradiction:

Improvelight transmittance uniformityVSAvoidcolor inequality due to sunlight exposure

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the sealing portion by incorporating silicon, oxygen, nitrogen, and hydrogen in specific ratios. This composition modification adjusts the optical properties of the sealing layer to minimize light transmittance variation across different sunlight wavelengths, thereby reducing color inequality while maintaining manufacturing feasibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The sealing portion is constructed as a composite material containing multiple elements (silicon, oxygen, nitrogen, hydrogen) in controlled proportions. This composite structure enables the sealing layer to exhibit optimized optical characteristics that conventional single-material sealing portions cannot achieve, specifically minimizing wavelength-dependent transmittance variations

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If the sealing portion is made with standard inorganic materials, then the manufacturing process is simple, but the refractive index does not match optimally leading to light transmittance deviation

Engineering Contradiction:

Improvesealing portion fabricationVSAvoidlight transmittance consistency

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The patent modifies the refractive index parameter of the sealing portion by controlling the composition ratios of silicon, oxygen, nitrogen, and hydrogen. This parameter adjustment optimizes light transmittance consistency across sunlight wavelengths while maintaining compatibility with existing manufacturing processes such as chemical vapor deposition

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional sealing layers are used, then device complexity is low, but image quality degrades under sunlight exposure due to color inequality

Engineering Contradiction:

Improvesealing portion structureVSAvoidimage quality stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent changes the compositional parameters of the sealing layer to optimize its optical performance. By adjusting the ratios of silicon, oxygen, nitrogen, and hydrogen, the sealing portion maintains structural simplicity while achieving improved image quality stability under sunlight exposure through reduced color inequality

Inventive Principle:

Principle #35Parameter changes

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 solution effectively minimizes light transmittance deviations across various sunlight wavelengths, thereby reducing color inequality and maintaining image quality in OLED displays exposed to sunlight.

Implementation Method 1

The first inorganic layer comprises at least one layer including silicon, oxygen, nitrogen and hydrogen... minimizes a deviation in light transmittance variation due to the wavelength of the sunlight

Methodology Applied

Scientific EffectLight absorption and filtering: Absorption (EM radiation)

Implementation Method 2

a chemical vapor deposition process with specific gas flow rates and compositions to achieve optimal refractive indices and composition ratios

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentUS12255273B2Display device and method for fabricating the same

Publication Date: 2025.03.18 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a substrate and a light emitting layer on the substrate. The display device further includes a sealing portion on the light emitting layer. The sealing portion comprises a first inorganic layer. The first inorganic layer comprises at least one layer including silicon, oxygen, nitrogen and hydrogen. The at least one layer of the first inorganic layer includes a content of silicon of about 30-40 (at %), a content of oxygen of about 15-35 at %, a content of nitrogen of about 10-20 at %, a content of hydrogen of about 20-30 at %.