Via-Connected OLED First Electrode for Miniaturization
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Solution Overview
Problem
The existing display devices using organic electroluminescence face challenges in miniaturization and brightness due to increased pixel pitch and low light emitting region proportion when the first electrode and wiring are connected in a different region, making it difficult to meet demands for further miniaturization and increased brightness.
Innovation Solution
A display device is designed with a two-dimensional matrix arrangement of pixels, where the first electrode includes a conductive light reflecting film on an insulating layer and a transparent electrode on the light reflecting film, with vias formed in the insulating layer to connect the electrodes, allowing for voltage application without increasing pixel pitch and enhancing light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first electrode and wiring are connected in a region different from that of the first electrode, then the connection is simplified, but the pixel pitch increases and the light emitting region proportion decreases
Solution Approach 1:
The patent transitions from planar connection to three-dimensional connection by forming vias through the insulating layer to connect the first electrode to the wiring. This vertical connection approach allows the electrode and wiring to be connected in different planar regions while maintaining compact pixel pitch, effectively resolving the contradiction between connection simplicity and pixel size.
2Ease of manufacture
If the first electrode and wiring are connected in a region different from that of the first electrode, then the connection is simplified, but the light emitting region proportion decreases
Solution Approach 1:
By utilizing the vertical dimension through via formation, the patent enables connection in different planar regions without sacrificing light emitting area. The via structure provides a compact connection path that preserves the proportion of the light emitting region while simplifying the manufacturing process.
3Length of moving object
If vias are formed in the insulating layer to connect the first electrode and wiring, then the pixel pitch can be reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the connection process into distinct steps: forming vias through the insulating layer, forming the first electrode, and forming the wiring. This segmentation allows each component to be optimized independently while maintaining overall compactness, reducing pixel pitch without excessive manufacturing 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 configuration allows for further miniaturization of pixels and increased brightness while maintaining a compact pixel structure, improving the display device's performance and efficiency.
Implementation Method 1
the first electrode is configured to have light reflectivity
Implementation Method 2
A display element using organic electroluminescence and a display device including pixels composed of such a display element are well known
Data Source
AI summary
Provided is a display device in which pixels each configured by layering a first electrode, an organic layer, and a second electrode are formed in a two-dimensional matrix arrangement on a substrate; the first electrode is arranged for each pixel and includes a conductive light reflecting film formed on an insulating layer provided on the substrate, and a transparent electrode formed on the light reflecting film; vias conductive with the light reflecting films are formed in portions of the insulating layer positioned under the light reflecting films; and a voltage is applied to the first electrodes through the vias.