Flat Panel Display Sealing Passivation Layer
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Solution Overview
Problem
Conventional flat panel display devices face degradation due to permeation of oxygen and moisture, which leads to oxidation and corrosion of emission elements, resulting in reduced performance and shortened lifespan, and require additional processes and costs for protection.
Innovation Solution
The solution involves a flat panel display device with bank portions and dummy bank portions arranged in a pattern to create openings for emission elements and absorbing material, respectively, covered by a sealing passivation layer with alternating organic and inorganic films to prevent oxygen and moisture ingress, minimizing additional manufacturing processes and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered protective layer with high-density layers and planarizing layers is formed, then oxygen/moisture permeation is prevented, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the essential protective function from the complex multi-layered structure and implements it through a simplified single-layer encapsulation layer combined with a buffer layer, removing unnecessary structural complexity while maintaining protection against oxidation and corrosion
Solution Approach 2:
The invention uses a composite structure consisting of an encapsulation layer and a buffer layer, where the buffer layer contains oxygen scavenger and moisture scavenger materials combined in a single layer, achieving effective protection with reduced structural complexity
2Reliability
If an absorbing layer with active metal element is formed to absorb oxygen/moisture, then harmful material absorption is improved, but additional materials and processes are required
Solution Approach 1:
The invention merges the oxygen scavenger and moisture scavenger materials into a single buffer layer, eliminating the need for separate absorbing layers and reducing manufacturing steps while maintaining effective absorption of harmful materials
Solution Approach 2:
The buffer layer serves multiple functions simultaneously: it acts as both an oxygen scavenger and a moisture scavenger, eliminating the need for separate specialized layers and simplifying the manufacturing process
3Ease of manufacture
If the absorbing layer is made as a thin film type, then manufacturing is simplified, but the amount of active metal element is limited and saturation occurs early
Solution Approach 1:
The invention changes the parameters of the buffer layer by incorporating both oxygen scavenger and moisture scavenger materials with different chemical compositions and properties, enabling the layer to maintain low thickness while providing sufficient absorption capacity through optimized material selection and composition
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 effectively prevents the degradation of emission elements by blocking harmful materials, enhancing the reliability and longevity of the display device while reducing manufacturing complexity and costs.
Implementation Method 1
an absorbing material layer located at the second openings to absorb oxygen/moisture
Implementation Method 2
a sealing passivation layer isolating the emission elements from an outside of the display device and having a structure including at least two layers in which an organic film and an inorganic film are alternately deposited
Data Source
AI summary
A flat panel display device includes a display area in which a desired image is displayed, and a non-display area arranged outside the display area and bordering the display area, and further includes bank portions arranged in a pattern in the display area and partitioning a plurality of first openings, emission elements arranged at the first openings, dummy bank portions formed in the non-display area in substantially a same pattern as the bank portions and partitioning a plurality of second openings, an absorbing material layer for removing oxygen/moisture located at the second openings, and a sealing passivation layer isolating the emission elements from the outside air and including a structure having at least two layers comprising an organic film and an inorganic film deposited alternately. Thus, the emission elements are prevented from being oxidized or corroded by a harmful material, and in a manner that minimizes additional processes.