Dual-Side Emission Display Device Bezel Elimination
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Solution Overview
Problem
Existing display devices have a non-light emitting bezel region that cannot be minimized effectively, leading to dead space and reliability issues with the edge of the encapsulation layer.
Innovation Solution
A display device design featuring a first substrate with a top emission layer and a second substrate with a bottom emission layer, where the layers overlap to maximize the emission region, using thin glass substrates and a specific layer structure to enhance flexibility and hardness, and an adhesive layer to adhere the encapsulation layers, ensuring seamless integration and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a window is bent to minimize the bezel region, then the bezel region size is reduced, but dead space remains and the reliability of the encapsulation layer edge deteriorates
Solution Approach 1:
The patent transitions from a single-sided emission structure to a dual-sided emission structure by adding a second substrate with emission layers on both the first and second substrates. This dimensional change allows light emission from both front and back sides, effectively eliminating the non-emitting bezel region while maintaining structural integrity and avoiding dead space issues.
Solution Approach 2:
The display device is segmented into multiple independent emission regions: a first emission layer on the first substrate and a second emission layer on the second substrate. This segmentation allows each layer to be optimized independently and ensures that the entire surface area, including regions that would traditionally be bezel, contributes to light emission.
2Area of moving object
If the bezel region is minimized, then the light emission region is maximized, but dead space exists and encapsulation layer reliability deteriorates
Solution Approach 1:
By implementing emission layers on both the first substrate and second substrate, the patent creates light emission in multiple dimensions. This ensures that the entire surface area of both substrates contributes to light emission, maximizing the light emission region area while eliminating dead space and maintaining encapsulation layer reliability through proper structural design.
3Adaptability or versatility
If thin glass substrates are used, then flexibility is improved, but structural strength may be compromised
Solution Approach 1:
The patent employs thin glass substrates (50-100 μm thickness) that provide flexibility while maintaining sufficient structural strength. The dual-substrate design with emission layers on both sides creates a composite structure where the combination of thin substrates and emission layers achieves both flexibility and strength requirements.
Solution Approach 2:
The patent specifies a controlled thickness range for the glass substrates (50-100 μm), optimizing the balance between flexibility and strength. This parameter optimization allows the substrates to be thin enough for flexibility while maintaining adequate mechanical strength for structural integrity.
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 maximizes the emission region by eliminating non-light emitting areas and enhances the display quality by ensuring the boundary between top and bottom emission layers is not distinguishable, while also providing improved flexibility and hardness through the use of thin glass and specific coatings.
Implementation Method 1
electrons injected from one electrode and holes injected from the other electrode are combined in the organic emission layer to form excitons, and the excitons release energy to emit light
Implementation Method 2
an adhesive layer adhering the first encapsulation layer and the second encapsulation layer to each other
Implementation Method 3
the first substrate and the second substrate may be respectively chemical tempered glasses including a potassium factor
Data Source
AI summary
A display device includes a first substrate, a first emission layer disposed on the first substrate and emitted by a top emission type, a second substrate facing the first substrate and covering the first substrate, and a second emission layer disposed under the second substrate and emitted by a bottom emission type, wherein a portion of the first emission layer and a portion of the second emission layer.