OLED Conductive Adhesive Layer for Bank Protection
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Solution Overview
Problem
Existing organic light-emitting display devices face challenges in maintaining low surface resistance and high light transmittance due to the direct contact between the connection electrode layer and the bank, leading to potential cutting and increased surface resistance.
Innovation Solution
A conductive adhesive layer with a thickness less than the connection electrode layer, made of a metallic element like aluminum or tungsten, is used between the pixel-defining layer and the connection electrode layer, ensuring excellent adhesiveness and preventing cutting while maintaining light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the connection electrode layer directly contacts the bank, then the manufacturing process is simple, but the surface resistance increases and light transmittance decreases
Solution Approach 1:
A conductive adhesive layer is introduced as an intermediary between the connection electrode layer and the bank. This adhesive layer prevents direct contact that would cause cutting and resistance increase, while still providing electrical connection. The adhesive layer acts as a mediator that resolves the conflict between manufacturing simplicity and electrical performance reliability.
2Ease of manufacture
If the connection electrode layer directly contacts the bank, then the manufacturing process is simple, but the light transmittance decreases
Solution Approach 1:
The conductive adhesive layer serves as an intermediary that allows light to pass through while preventing the connection electrode layer from directly contacting and cutting the bank. This intermediary layer maintains optical performance by avoiding the formation of defects that would block light transmission.
3Reliability
If a conductive adhesive layer is added, then the surface resistance is reduced and connection is stabilized, but the device structure becomes more complex
Solution Approach 1:
The conductive adhesive layer performs multiple functions simultaneously: it provides electrical connection, prevents cutting of the bank, reduces surface resistance, and maintains light transmittance. By consolidating these multiple functions into a single layer, the patent minimizes the increase in device complexity while achieving multiple performance improvements.
4Strength
If the conductive adhesive layer is made thicker, then the adhesion is stronger, but the light transmittance decreases
Solution Approach 1:
The patent optimizes the thickness parameter of the conductive adhesive layer to achieve the best balance between adhesion strength and light transmittance. By carefully controlling this parameter, the adhesive layer provides sufficient mechanical bonding while remaining thin enough to allow high light transmission, thus resolving the contradiction between strength and optical performance.
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 effectively prevents surface resistance increases and maintains high light transmittance by stabilizing the connection between the electrodes and the bank, enhancing the manufacturing process and performance of organic light-emitting display devices.
Implementation Method 1
a conductive adhesive layer between the pixel-defining layer and the connection electrode layer, and contacting the pixel-defining layer
Implementation Method 2
conductive adhesive layer... configured to electrically connect the first opposite electrode to the second opposite electrode
Data Source
AI summary
An organic light-emitting display device includes a substrate including first and second pixel regions, pixel electrodes respectively corresponding thereto, a pixel-defining layer on the substrate, defining a first opening corresponding to the first pixel region, and defining a second opening corresponding to the second pixel region, a first intermediate layer in the first opening and corresponding to the first pixel region, a first opposite electrode on the first intermediate layer, a second intermediate layer in the second opening and corresponding to the second pixel region, a second opposite electrode on the second intermediate layer and spaced from the first opposite electrode, a connection electrode layer on the pixel-defining layer to cover the first and second pixel regions, and configured to electrically connect the first opposite electrode to the second opposite electrode, and a conductive adhesive layer between the pixel-defining layer and the connection electrode layer, and contacting the pixel-defining layer.