Shared Sealing Substrate for Thin Two-Sided Organic EL Display
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Solution Overview
Problem
The challenge in developing a thinner organic EL display device with a two-sided configuration is due to the need for two sealing substrates and the requirement for desiccants to prevent atmospheric degradation, which complicates the manufacturing process and increases thickness.
Innovation Solution
The solution involves a configuration where a common sealing substrate with concave portions is used, allowing for the integration of desiccants and organic EL light emitting elements on both sides, reducing the number of sealing substrates and using high-quality organic EL elements only on one side, thereby achieving a thinner and more reliable display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-sided organic EL display device is constructed with two sealing substrates and desiccants to prevent atmospheric degradation, then device reliability is improved, but device thickness increases
Solution Approach 1:
The patent combines two separate sealing substrates into a single common sealing substrate that hermetically seals both organic EL light emitting elements. This merging eliminates the need for two separate sealing structures and reduces overall device thickness while maintaining reliable hermetic sealing against atmospheric degradation.
Solution Approach 2:
The common sealing substrate performs multiple functions: it hermetically seals both organic EL light emitting elements, provides structural support for the entire two-sided display device, and eliminates the need for separate sealing substrates. This multi-functionality reduces device complexity and thickness.
2Manufacturing precision
If high-quality organic EL elements are used on both sides of the display device, then display quality is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies different quality levels to different parts of the device: high-quality organic EL light emitting elements are used on one side where primary display function is needed, while the other side uses lower-quality elements suitable for secondary display purposes. This local differentiation optimizes overall device performance while reducing manufacturing complexity and cost.
3Reliability
If desiccants are integrated within the sealing structure to absorb moisture and oxygen, then organic EL element protection is improved, but device thickness increases
Solution Approach 1:
The patent integrates desiccants directly into the common sealing substrate structure, combining the sealing function and moisture/oxygen absorption function into a single integrated component. This eliminates the need for separate desiccant chambers or additional thickness for desiccant placement.
Solution Approach 2:
The desiccants are nested within the structure of the common sealing substrate, placing the moisture and oxygen absorbing materials inside the sealing structure itself. This nesting approach allows desiccants to be housed within the existing structural envelope without adding external thickness.
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 results in a highly reliable, thin-type two-sided organic EL display device with reduced material costs and extended lifespan, while simplifying the production process and maintaining device reliability.
Implementation Method 1
a first absorption layer disposed on the bottom surface of the first concave portion
Implementation Method 2
an absorbent layer(s) having hygroscopic and deoxidizing functions
Implementation Method 3
an absorbent layer(s) having hygroscopic and deoxidizing functions
Data Source
AI summary
In an organic EL display panel, one sealing substrate is shared between two organic EL substrates, thereby achieving thinning and lightening of the panel body. The display panel includes a sealing substrate having a first concave portion and a second concave portion opposite the first concave portion, a first transparent glass substrate hermetically sealed on the first concave portion, a first organic light emitting element formed on a surface of the first transparent glass substrate, a first desiccant disposed on a bottom surface of the first concave portion, a second transparent glass substrate hermetically sealed on the second concave portion, a second organic light emitting element formed on a surface of the second transparent glass substrate, a second desiccant disposed on a surface of the second concave portion, wherein the first organic light emitting element and the second organic light emitting element achieve a shared use of the sealing substrate.