OLED Opposite Electrode Thickness Segmentation
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Solution Overview
Problem
In organic light emitting display (OLED) devices, the thick opposite electrode used as a reflection electrode can cause short circuits due to gaps with the pixel electrode and decreased reflectivity, while a thin opposite electrode may lead to film blistering and poor bonding with the pixel defining layer, affecting image stability and production defects.
Innovation Solution
The opposite electrode has a first thickness in the pixel part ranging from 700 to 1000 Angstroms and a second thickness greater than 2000 Angstroms in the contact part, with a double-layer structure including a reflection electrode to effectively reflect light and prevent short circuits and film blistering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opposite electrode is made thick to prevent short circuits, then reliability is improved, but manufacturing precision deteriorates due to film blistering and bonding issues
Solution Approach 1:
The patent applies local quality by making the opposite electrode thickness position-dependent: thicker (≥2000 Å) in contact parts where bonding strength is critical, and thinner (700-1000 Å) in pixel parts where short circuit prevention is less demanding. This localized differentiation resolves the contradiction by optimizing each region's thickness for its specific functional requirements.
Solution Approach 2:
The opposite electrode is segmented into two distinct thickness regions: a first thickness in the pixel part and a second thickness in the contact part. This segmentation allows independent optimization of each region's thickness to prevent both short circuits and film blistering simultaneously.
2Manufacturing precision
If the opposite electrode is made thin to improve manufacturing precision, then film bonding quality is improved, but reliability deteriorates due to increased short circuit risk
Solution Approach 1:
The patent applies local quality by making the opposite electrode thickness position-dependent: thicker (≥2000 Å) in contact parts where bonding strength is critical, and thinner (700-1000 Å) in pixel parts where short circuit prevention is less demanding. This localized differentiation resolves the contradiction by optimizing each region's thickness for its specific functional requirements.
Solution Approach 2:
The opposite electrode is segmented into two distinct thickness regions: a first thickness in the pixel part and a second thickness in the contact part. This segmentation allows independent optimization of each region's thickness to prevent both short circuits and film blistering simultaneously.
3Illumination intensity
If the opposite electrode thickness is increased to improve reflectivity, then illumination intensity is improved, but device complexity increases due to structural modifications
Solution Approach 1:
The patent applies local quality by making the opposite electrode thickness position-dependent: thicker (≥2000 Å) in contact parts where bonding strength is critical, and thinner (700-1000 Å) in pixel parts where short circuit prevention is less demanding. This localized differentiation resolves the contradiction by optimizing each region's thickness for its specific functional requirements.
Solution Approach 2:
The opposite electrode is segmented into two distinct thickness regions: a first thickness in the pixel part and a second thickness in the contact part. This segmentation allows independent optimization of each region's thickness to prevent both short circuits and film blistering simultaneously.
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 reduces dark spot generation and film blistering, ensuring stable image production and minimizing product defects by optimizing the thickness and structure of the opposite electrode.
Implementation Method 1
The opposite electrode may include a reflection electrode which reflects light generated from the light emitting layer toward the pixel electrode.
Data Source
AI summary
An organic light emitting display apparatus includes a pixel part including a pixel electrode, a light emitting layer and an opposite electrode, and a contact part in which the opposite electrode contacts a power line, wherein a first thickness of the opposite electrode in the pixel part is different from a second thickness of the opposite electrode in the contact part.