OLED Pixel Repair via Peeling Suppression Layer
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Solution Overview
Problem
Existing organic electroluminescent display devices face issues with repairing black-dot defective pixels, as laser repair methods can cause the organic light emitting layer to peel off, leading to reduced hermetic sealing and accelerated deterioration.
Innovation Solution
Incorporating a peeling suppression layer or thermal expansion layer between the first electrode and the organic light emitting layer, and using near ultraviolet laser beams to create a cavity portion, which electrically separates the defective pixel area, thereby preventing peeling and damage to the organic light emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If laser beams are used to repair black-dot defective pixels, then the defective pixels can be repaired, but the organic light emitting layer may peel off and hermetic sealing is reduced
Solution Approach 1:
A peeling suppression layer is introduced as an intermediary between the first electrode and the organic light emitting layer. This layer prevents direct contact and potential peeling between the electrode and the organic layer during laser repair, while still allowing the laser to effectively repair defective pixels. The peeling suppression layer acts as a buffer that maintains hermetic sealing integrity.
Solution Approach 2:
The peeling suppression layer is provided in advance before laser repair is performed. This layer pre-establishes protection against peeling that might occur during the laser repair process, cushioning the organic light emitting layer from direct thermal and mechanical stress of the laser beams.
2Ease of repair
If laser beams are used to repair defective pixels, then the defective pixels can be repaired, but the organic light emitting layer may be damaged and deterioration is accelerated
Solution Approach 1:
The peeling suppression layer serves as a protective intermediary that absorbs and distributes laser energy, preventing direct damage to the organic light emitting layer during repair. This allows effective repair while reducing thermal stress and preventing accelerated deterioration of the organic layer.
Solution Approach 2:
The peeling suppression layer changes the thermal and mechanical parameters at the interface between the electrode and organic layer. It modifies heat distribution and stress characteristics during laser irradiation, reducing peak temperatures and preventing localized overheating that would accelerate deterioration.
3Reliability
If a peeling suppression layer is added between the first electrode and organic light emitting layer, then peeling is prevented during laser repair, but device structure becomes more complex
Solution Approach 1:
The peeling suppression layer is implemented as a thin film structure that provides protective functionality without significantly increasing device thickness or structural complexity. This thin film approach maintains the compact nature of OLED devices while delivering peeling prevention and laser damage protection.
Solution Approach 2:
The peeling suppression layer serves multiple functions simultaneously: it prevents peeling during laser repair, protects the organic light emitting layer from laser damage, and maintains hermetic sealing. This multi-functionality reduces the need for additional separate protective structures, thereby limiting the increase in device complexity.
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 method effectively repairs black-dot and bright-failure defective pixels by forming a uniformly emitting pixel, reducing the risk of moisture and oxygen absorption, and improving the yield ratio and color balance of the display device.
Implementation Method 1
a peeling suppression layer is provided between a first electrode and an organic light emitting layer, and a cavity portion is formed by evaporating the peeling suppression layer due to an absorption of laser beams
Implementation Method 2
a thermal expansion layer is provided between a first electrode and an organic light emitting layer, and a cavity portion is formed by thermal deformation due to heat generated by an absorption of laser beams
Implementation Method 3
a cavity portion is formed by evaporating the peeling suppression layer due to an absorption of laser beams of near ultraviolet rays
Data Source
AI summary
The present invention provides an organic electroluminescent display device and a method of repairing a defective pixel of an organic electroluminescent display device which can realize the repairing a defective pixel to a light emitting pixel by electrically separating a leak portion which generates a defective pixel. To be more specific, a peeling suppression layer is formed between an anode and an organic light emitting layer formed on a main substrate, and a cavity is formed between the main substrate and the peeling suppression layer due to the evaporation generated by an absorption of laser beams thus electrically separating a defective portion so as to repair a black-dot defective pixel to form a light emitting pixel.