Organic EL Display Bank Taper Angle Control
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Solution Overview
Problem
The existing organic electroluminescence (EL) display devices face challenges in achieving desired cross-sectional shapes for the organic EL layer and sealing layer due to varying taper angles of the separation layer and frame-shaped bank, which can affect the quality and functionality of these layers.
Innovation Solution
The organic EL display device incorporates a separation layer and a frame-shaped bank with distinct taper angles, where the taper angle of the separation layer is different from that of the frame-shaped bank, allowing for precise control of the cross-sectional shapes to meet the required quality standards for the organic EL layer and sealing layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the separation layer and frame-shaped bank are formed with uniform taper angles, then the manufacturing process is simplified, but the cross-sectional shapes of the organic EL layer and sealing layer cannot meet the desired quality requirements
Solution Approach 1:
The patent applies local quality by assigning different taper angles to different regions: the separation layer has a first taper angle optimized for confining the organic EL layer, while the frame-shaped bank has a second taper angle optimized for confining the sealing layer. This allows each structure to have the specific geometric properties needed for its function, achieving high manufacturing precision for both layers simultaneously.
Solution Approach 2:
The patent segments the bank structure into two distinct components with different geometric parameters: the separation layer and the frame-shaped bank. By dividing the bank into these functional segments with different taper angles, each can be optimized independently for its specific purpose, resolving the contradiction between precision and complexity.
2Ease of manufacture
If the taper angles are not controlled, then the manufacturing process is simpler, but the wetting and spreading of liquid materials cannot be regulated effectively
Solution Approach 1:
The patent applies parameter changes by optimizing the taper angles as geometric parameters to control material behavior. The first taper angle of the separation layer and the second taper angle of the frame-shaped bank are specifically designed to regulate the wetting and spreading characteristics of the organic EL layer and sealing layer materials, respectively, ensuring reliable material confinement.
Data Source
AI summary
In an organic EL display device, a taper angle of a separation layer surrounding edges of an organic EL layer disposed in each pixel and being disposed between adjacent pixels is different from a taper angle of a frame-shaped bank surrounding edges of an organic layer. As a result, qualities required for layers surrounded by the separation layer and the frame-shaped bank respectively are satisfied.