OLED Sealing Structure with Metal Oxide Films
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Solution Overview
Problem
Conventional organic light emitting display devices face issues with moisture permeation through ultraviolet curing seal patterns, leading to pixel degradation and reduced service life due to the separation of seal patterns from substrates and introduction of external gases.
Innovation Solution
A sealing structure incorporating metal oxide films and low melting point metal connections between substrates, with a capsule film surrounding the substrates to prevent moisture and gas ingress, and an optional ultraviolet curing seal pattern for additional sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ultraviolet curing seal patterns are used to bond substrates, then the sealing process is simple and fast, but moisture and gases permeate through the seal pattern causing pixel degradation
Solution Approach 1:
The patent uses a composite sealing structure combining organic UV-curing seal patterns with inorganic metal oxide films (such as silicon oxide, silicon nitride, or aluminum oxide). The organic seal pattern provides bonding functionality while the inorganic metal oxide film layer provides moisture and gas barrier properties, creating a composite sealing system that addresses both sealing efficiency and moisture protection requirements
Solution Approach 2:
The inorganic metal oxide film is positioned within or alongside the organic seal pattern structure, creating a nested or layered configuration where the metal oxide film is embedded in the sealing structure. This nested arrangement allows the moisture barrier function to be integrated within the sealing system without compromising the bonding capability of the outer seal pattern
2Ease of manufacture
If conventional seal patterns are used, then manufacturing is simple, but the seal pattern separates from substrates allowing external gas introduction
Solution Approach 1:
The composite sealing structure combines organic and inorganic materials where the inorganic metal oxide film provides enhanced adhesion to the substrate surfaces while the organic seal pattern provides bonding functionality. This composite approach maintains manufacturing simplicity while significantly improving adhesion reliability and preventing seal pattern separation
Solution Approach 2:
The inorganic metal oxide film acts as an intermediary layer between the organic seal pattern and the substrate, improving the interface adhesion. This intermediary layer prevents direct contact issues between organic and inorganic surfaces, ensuring reliable bonding while maintaining the simplicity of the overall manufacturing process
3Device complexity
If no additional protective layer is added, then device structure is simple, but pixels degrade due to moisture permeation through seal pattern
Solution Approach 1:
The patent introduces an inorganic metal oxide film layer with high moisture barrier properties into the sealing structure. This layer acts as a protective barrier that prevents moisture permeation to the pixels while maintaining relatively simple device architecture through the integration of this functional layer into the existing seal pattern system
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 prevents pixel degradation by enhancing adhesion and isolating the display region from external moisture and gases, thereby improving the reliability and service life of the organic light emitting display device.
Implementation Method 1
a low melting point metal material having a melting point of 100 to 300° C.
Implementation Method 2
metal members, having a low melting point, formed at the non-display regions between the first substrate and the second substrate
Implementation Method 3
a capsule film formed to surround front, rear, and side surfaces of the first and second substrates
Data Source
AI summary
An organic light emitting display device that is capable of preventing the permeation of moisture by changing a sealing structure, thereby preventing the degradation of pixels and thus improving look-and-feel characteristics and a method of manufacturing the same are disclosed. The organic light emitting display device includes a first substrate and a second substrate being opposite to each other, the first substrate and the second substrate having a display region defined in the middle thereof and a non-display region defined at the edge thereof, respectively, a plurality of gate lines and data lines formed at the display region on the first substrate, the gate lines and the data lines crossing each other to define a pixel region, a thin film transistor formed at each of the intersections between the gate lines and data lines, an organic light emitting layer formed on the second substrate corresponding to the pixel region, and first and second electrodes located above and below the organic light emitting layer and a sealing structure connected between the first and second substrates, such that the first and second substrates are bonded to each other by the sealing structure, for preventing the permeation of moisture and gas.