OLED Substrate Bonding via Adhesive Force Improving Member
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Solution Overview
Problem
Organic light emitting devices (OLEDs) with elements formed on two substrates are prone to image interruption due to separation of conductors and electrodes caused by temperature rise, impact, vibration, and humidity absorption, leading to reduced aperture ratio and manufacturing complexity.
Innovation Solution
An organic light emitting device design featuring a first and second display substrate with adhesive force improving members and a sealing member to maintain electrical and physical contact between elements on both substrates, using low melting point metals for bonding and a sealing member to prevent environmental interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If elements are formed on two separate substrates, then manufacturing complexity is reduced and aperture ratio is improved, but reliability deteriorates due to separation of conductors and electrodes under temperature rise, impact, vibration, and humidity
Solution Approach 1:
The device is divided into two separate substrates: a first substrate containing the organic light emitting element and a second substrate containing the driving transistor. This segmentation simplifies manufacturing by allowing independent fabrication of each substrate, reduces aperture ratio loss by eliminating the need for large-area transparent conductors, while the patent addresses the resulting reliability issue through adhesive force improving members that maintain stable electrical contact across the substrate interface
Solution Approach 2:
An adhesive force improving member is introduced as an intermediary component between the first and second substrates. This intermediary serves multiple functions: it mechanically bonds the substrates together to prevent separation under environmental stress, and it maintains electrical contact between the conductor on the second substrate and the electrode on the first substrate, thereby resolving the reliability issue while preserving the benefits of the segmented structure
2Area of stationary object
If elements are formed on two separate substrates, then aperture ratio is improved, but reliability deteriorates due to separation of conductors and electrodes under temperature rise, impact, vibration, and humidity
Solution Approach 1:
By segmenting the device into two substrates, the aperture ratio is improved because the organic light emitting element can occupy a larger area on the first substrate without being constrained by the need for large-area transparent conductors that would be required in a single-substrate design. The segmentation allows for more efficient use of the display area
Solution Approach 2:
The adhesive force improving member acts as an intermediary that ensures reliable electrical connection between the conductor on the second substrate and the electrode on the first substrate. This mediator maintains contact stability under temperature rise, impact, and vibration, preventing the reliability deterioration that would otherwise result from the segmented structure
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
Prevents separation of light-emitting elements on two substrates during deformation, ensuring stable image display and simplifying manufacturing by maintaining contact between conductors and electrodes, thus enhancing the aperture ratio and durability of OLEDs.
Implementation Method 1
a first adhesive force improving member disposed between the second electrode and the first driving signal delivery part
Implementation Method 2
using low melting point metals for bonding
Implementation Method 3
a sealing member to prevent environmental interference
Data Source
AI summary
An organic light emitting device and a manufacturing method thereof are provided. The organic light emitting device includes a first display substrate, a second display substrate, and a first adhesive force improving member. The first display substrate includes a first substrate, a first electrode, organic light emitting patterns, a first spacer, and a second electrode. The first electrode is formed on an entire surface of the first substrate, and the organic light emitting patterns are disposed on the first electrode. The first spacer corresponds to the organic light emitting pattern and is disposed on the first electrode. The second electrode covers the organic light emitting patterns and the first spacer. The second display substrate includes a second substrate, and a first driving signal delivery part. The first adhesive force improving member electrically/physically couples the second electrode to the first driving signal delivery part.