OLED Frit Encapsulation Layout for Moisture Sealing and Light Blocking
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Solution Overview
Problem
Existing organic light-emitting display devices face challenges in effectively blocking oxygen and moisture infiltration and preventing light leakage, which complicates the fabrication process and reduces image quality due to the limited effectiveness of traditional frit sealing methods.
Innovation Solution
The use of a frit layer and frit seal with specific thickness and placement on the inner and outer surfaces of substrates, where the frit layer is formed over one portion and the frit seal is formed over another, creating an enclosed space around light-emitting pixels, using a glass material with filler materials to adjust absorption and thermal expansion characteristics, and employing laser or infrared irradiation for sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frit is applied only to the outer edge of the display region for encapsulation, then the encapsulation function is achieved, but light leakage from regions outside the display region cannot be effectively blocked
Solution Approach 1:
The frit application is segmented into two distinct portions: a first portion applied to the outer edge for encapsulation, and a second portion (black matrix) applied to the inner surface for light blocking. This segmentation allows each portion to specialize in its specific function without compromise.
Solution Approach 2:
Different regions of the frit application have different properties: the first portion at the outer edge provides sealing and encapsulation, while the second portion on the inner surface provides light absorption and blocking. This local differentiation of quality enables simultaneous achievement of encapsulation and light leakage prevention.
2Object-affected harmful factors
If a light shielding film is formed on the back substrate to prevent light leakage, then light leakage is reduced, but the fabrication process becomes complicated and process time is extended
Solution Approach 1:
The encapsulation function and light blocking function are merged into a single material system (frit) applied in different portions. This eliminates the need for separate light shielding films and reduces the total number of fabrication steps.
Solution Approach 2:
The frit material serves multiple functions: it provides encapsulation when applied to the outer edge, and it provides light blocking when applied to the inner surface. This multi-functionality reduces the need for additional specialized components and simplifies the overall device structure.
3Object-affected harmful factors
If frit is applied to block light leakage from outside the pixel region, then light leakage is prevented, but the encapsulation of substrates against oxygen and moisture infiltration is compromised
Solution Approach 1:
The frit application is divided into spatially separated portions: the first portion at the outer edge maintains encapsulation integrity by sealing the substrate edges, while the second portion on the inner surface blocks light leakage without interfering with the encapsulation seal.
Solution Approach 2:
The solution moves from a single-plane frit application to a multi-dimensional approach with frit applied at different locations (outer edge vs. inner surface) and orientations, allowing simultaneous achievement of encapsulation and light blocking functions.
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 approach effectively prevents oxygen and moisture infiltration, simplifies the fabrication process, and significantly reduces light leakage, thereby enhancing the image quality and longevity of organic light-emitting display devices.
Implementation Method 1
a frit seal interconnecting the first and second substrates while surrounding the first array and the second array such that the frit seal, the first substrate and the second substrate form an enclosed space
Implementation Method 2
the frit can comprise a black absorbing tint in order and block light and function as a black matrix, BM, thereby preventing light leakage
Implementation Method 3
employing laser or infrared irradiation for sealing
Implementation Method 4
employing laser or infrared irradiation for sealing
Data Source
AI summary
Disclosed is an organic light-emitting display device capable of blocking the infiltration of oxygen and moisture and effectively preventing light leakage. The device includes a first substrate with first and second pixel regions wherein a plurality of organic light-emitting diodes are formed. The device further includes a non-pixel region around the first and the second pixel-regions, a second substrate disposed on the upper part of the first substrate to be overlapped with the first and the second pixel regions and a part of the non-pixel region, and a frit provided between the first and the second substrates to be overlapped with at least one of the first and the second pixel regions and at least a part of the non-pixel region. The first and the second substrates are adhered to each other by the fit in the part corresponding to the non-pixel region.