Display Encapsulation Structure for Thin Moisture Barrier Planarization
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving reliable encapsulation of light-emitting elements while maintaining a thin and lightweight design, particularly in preventing the penetration of impurities such as oxygen or moisture.
Innovation Solution
A display apparatus is designed with a pixel electrode, a conductive bank layer, an intermediate layer, an opposite electrode, and a first inorganic encapsulation layer made of an inorganic material. The first inorganic encapsulation layer fills the bank opening and has an upper surface arranged higher than the conductive bank layer, providing both barrier and planarization characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a thin-film encapsulation layer is used instead of glass encapsulation substrate, then the display apparatus becomes thinner and lighter, but the reliability in preventing impurity penetration deteriorates
Solution Approach 1:
The patent employs a composite encapsulation structure consisting of multiple inorganic encapsulation layers (first inorganic encapsulation layer, second inorganic encapsulation layer) combined with organic encapsulation layers. This multi-material composite approach enhances the barrier performance against impurity penetration while maintaining the thin-film design, resolving the contradiction between lightweight construction and reliability.
Solution Approach 2:
The encapsulation system is segmented into multiple distinct layers including first and second inorganic encapsulation layers, organic encapsulation layers, and intermediate layers. Each layer serves specific protective functions, and the segmented structure provides multiple barriers against impurity penetration, thereby improving reliability without requiring a single thick glass substrate.
2Manufacturing precision
If the first inorganic encapsulation layer fills the bank opening and extends higher than the conductive bank layer, then the planarization and barrier characteristics are improved, but the device complexity increases
Solution Approach 1:
The first inorganic encapsulation layer is designed to perform multiple functions simultaneously: it provides barrier protection against impurities, planarizes the surface by filling the bank opening, and extends higher than the conductive bank layer to ensure complete coverage. This multi-functional design achieves high manufacturing precision without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the barrier function and planarization function into a single integrated encapsulation structure. The first inorganic encapsulation layer simultaneously serves as both the barrier layer and the planarization layer, eliminating the need for separate components and thereby reducing overall structural complexity while maintaining high precision.
Data Source
AI summary
A display apparatus includes: a pixel electrode; a conductive bank layer defining a bank opening overlapping the pixel electrode, the conductive layer including a first conductive layer and a second conductive layer; an intermediate layer arranged in the bank opening and overlapping the pixel electrode; an opposite electrode arranged in the bank opening and disposed on the intermediate layer; and a first inorganic encapsulation layer disposed on the opposite electrode, filling the bank opening, and including an inorganic material. The first inorganic encapsulation layer includes a first portion overlapping the bank opening, and a second portion overlapping the conductive bank layer, and an upper surface of the first portion of the first inorganic encapsulation layer and an upper surface of the second portion of the first inorganic encapsulation layer are at a level higher than an upper surface of the conductive bank layer.