OLED Encapsulation Layer with Localized Thickening Regions
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Solution Overview
Problem
Flexible OLED display panels face issues with poor encapsulation due to the first inorganic layer's inability to cover abnormal particles, leading to local fractures, water intrusion, and reduced display brightness, resulting in short service life and black spots.
Innovation Solution
A display panel with a first inorganic layer featuring light transmitting regions and thickening regions, where each light transmitting region covers at least one subpixel area, enhancing the encapsulation's covering ability without increasing film thickness, thereby preventing water intrusion and maintaining light transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the first inorganic layer is increased to improve encapsulation coverage, then the covering ability of foreign bodies is improved, but the light output efficiency decreases resulting in loss of display brightness
Solution Approach 1:
The first inorganic layer is designed with locally varying thickness: thickening regions with thickness of 10-20 nm are positioned at pixel definition layers and between adjacent subpixels to provide enhanced encapsulation coverage, while light transmitting regions maintain a thinner profile to preserve light output efficiency. This local differentiation resolves the contradiction by providing enhanced encapsulation only where foreign bodies are most likely to occur without compromising overall display brightness
2Strength
If the thickness of the first inorganic layer is increased to cover abnormal particles, then the encapsulation strength is improved, but the service life of cathode and luminous materials is shortened due to water intrusion through fractures
Solution Approach 1:
The patent implements localized thickening of the first inorganic layer at critical encapsulation points (pixel definition layers and inter-subpixel regions) while maintaining appropriate thickness in light transmitting regions. This prevents water intrusion through fractures at vulnerable locations without creating excessive thickness that would cause cracking, thereby extending the service life of cathode and luminous materials
3Reliability
If the first inorganic layer thickness is increased to prevent local fractures, then the encapsulation reliability is improved, but the light transmission efficiency is reduced
Solution Approach 1:
The first inorganic layer features spatially differentiated thickness with thickening regions (10-20 nm) positioned at pixel definition layers and between subpixels for enhanced encapsulation reliability, while light transmitting regions maintain reduced thickness to preserve light transmission efficiency. This local quality differentiation resolves the contradiction by providing enhanced reliability only where structurally necessary
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 enhanced encapsulation layer effectively covers foreign bodies, improves yield, and maintains luminous efficiency by ensuring the light transmitting regions do not become excessively thick, thus addressing the issue of poor encapsulation and extending the display panel's service life.
Implementation Method 1
a first inorganic layer, an organic layer and a second inorganic layer which are successively arranged in a direction away from the display substrate... the first inorganic layer includes light transmitting regions and thickening regions... effectively covers foreign bodies... preventing water intrusion
Implementation Method 2
the first inorganic layer includes light transmitting regions and thickening regions, each light transmitting region correspondingly covers at least one subpixel region in an orthographic direction on the display substrate, and a thickness of each thickening region is greater than that of the light transmitting region
Data Source
AI summary
The present application relates to the technical field of display, and provides a display panel, a preparation method and a display apparatus, wherein the display panel includes a display substrate and an encapsulation layer: each display pixel in the display substrate includes a plurality of subpixel regions; the encapsulation layer is located on a light outlet side of the display substrate, and the encapsulation layer includes a first inorganic layer and an organic layer which are arranged successively in a direction away from the display substrate; the first inorganic layer includes light transmitting regions and thickening regions, each light transmitting region correspondingly covers at least one subpixel region in an orthographic direction on the display substrate; and a thickness of the thickening regions is greater than the thickness of the light transmitting regions.