Moisture Absorbent Configuration for Organic EL Display Stability
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Solution Overview
Problem
Existing organic electroluminescence display devices face challenges in stabilizing organic EL elements due to limited moisture absorbent capacity in narrow regions, leading to potential moisture ingress and degradation.
Innovation Solution
The design involves forming a large amount of moisture absorbent in a limited narrow region by arranging multiple linear patterns of moisture absorbents in parallel, with intersecting sections forming mounds, to surround the display region and driver circuits, ensuring effective moisture absorption without increasing the frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a linear pattern moisture absorbent is applied to surround the display region, then the moisture absorbent amount is limited, but the characteristics of organic EL elements cannot be sufficiently stabilized
Solution Approach 1:
The moisture absorbent pattern transitions from a two-dimensional linear arrangement to a three-dimensional configuration by forming multiple layers and stacked structures within the narrow frame region. This vertical stacking allows significantly more moisture absorbent material to be contained within the same planar footprint, resolving the contradiction between limited space and required absorbent quantity.
Solution Approach 2:
The patent implements nested structures where moisture absorbent layers are stacked one within another in the vertical direction. Multiple absorbent layers are positioned at different heights within the sealing substrate's protrusion region, creating a nested arrangement that maximizes the amount of absorbent material packed into the confined space between the display region and the sealing substrate edge.
2Quantity of substance
If the number of turns of wound moisture absorbent is increased, then the amount of moisture absorbent may be increased, but the frame width has to be large
Solution Approach 1:
Instead of expanding the moisture absorbent pattern horizontally by increasing turns (which would widen the frame), the patent utilizes the vertical dimension by stacking multiple absorbent layers. This allows the absorbent amount to be increased without increasing the planar dimensions of the frame, effectively converting a horizontal expansion problem into a vertical stacking solution.
Solution Approach 2:
The moisture absorbent is divided into multiple discrete layers or segments stacked vertically within the protrusion region. Each layer can be independently formed and positioned, allowing the total absorbent amount to be increased by adding more segments in the vertical direction rather than expanding horizontally with additional turns.
3Reliability
If moisture absorbent is applied in a linear pattern outside the display region, then the display region can be surrounded, but the amount of moisture absorbent is limited in narrow regions
Solution Approach 1:
The patent exploits the vertical space within the protrusion region of the sealing substrate by forming multiple stacked layers of moisture absorbent. This transforms the limited two-dimensional planar area into an effective three-dimensional volume, allowing sufficient moisture absorbent to be placed in the narrow region without compromising the display region's surrounding protection.
Solution Approach 2:
The moisture absorbent layers are formed with porous structures that increase their moisture absorption capacity per unit volume. The porous configuration allows the absorbent material to effectively utilize the limited space within the protrusion region while maintaining high moisture protection effectiveness, resolving the contradiction between limited area and required protection level.
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 configuration stabilizes the characteristics of organic EL elements by efficiently utilizing non-display regions for moisture absorbent placement, preventing moisture ingress and maintaining high aperture ratios.
Implementation Method 1
a moisture absorbent is formed in a region of a concave surface surrounded by the protrusion of the sealing substrate
Data Source
AI summary
Provided is an organic EL display device in which a large amount of a moisture absorbent is formed in a limited narrow region. An organic electroluminescence display device includes a rectangle element substrate having a display region; and a sealing substrate firmly adhered to the element substrate at a protrusion formed on the periphery thereof, in which a moisture absorbent is formed in a region of a concave surface surrounded by the protrusion so as not to overlap the display region, and the moisture absorbent includes moisture absorbents which are formed of a plurality of linear pattern set each joined to adjacent another moisture absorbents so as to be disposed in parallel with each other, and the crosssections of the moisture absorbents intersecting the longitudinal direction of the moisture absorbents are formed in the shape of a plurality of mounds joined to each other.