Pixel Electrode Layout With Sub-Bank for Uniform Light Emission
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Solution Overview
Problem
Current display technologies face challenges in enhancing the reliability of pixels, particularly in the design and arrangement of electrodes and light emitting elements, which affects the efficiency and uniformity of light emission.
Innovation Solution
The proposed solution involves a pixel design with an emission area and a non-emission area, featuring a first bank with openings, multiple electrodes, and light emitting elements connected to these electrodes, along with a sub-bank and intermediate electrodes that surround the sub-bank, optimizing the electrical connections and light emission pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple electrodes and light emitting elements are arranged in the emission area, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
The pixel is divided into distinct emission and non-emission areas with banks separating different functional regions. Multiple electrodes (first electrode, second electrode, intermediate electrode) are segmented and positioned in specific areas to manage complexity while maintaining efficient light emission through organized spatial distribution.
Solution Approach 2:
The patent utilizes planar arrangement of multiple electrodes and light emitting elements in the emission area, organizing components in two-dimensional space. The intermediate electrode extends in the emission area while first and second electrodes are positioned in the non-emission area, creating a layered spatial organization that improves light emission efficiency without excessive vertical complexity.
2Manufacturing precision
If light emitting elements are densely arranged in the emission area, then display resolution is improved, but manufacturing precision requirements increase
Solution Approach 1:
Banks are formed in advance to define the emission area boundaries and create openings that guide the precise placement of light emitting elements. The first bank with its opening corresponding to the emission area provides pre-established positioning structures that simplify the subsequent arrangement of light emitting elements with high precision.
Solution Approach 2:
The emission area is distinguished from the non-emission area with specific structural characteristics. Banks are positioned at specific locations to create localized regions for light emitting elements, allowing different manufacturing precision requirements for different areas of the pixel structure.
3Reliability
If intermediate electrode surrounds sub-bank, then electrical connection reliability is improved, but device complexity increases
Solution Approach 1:
The intermediate electrode merges with the first and second electrodes to form a continuous electrical connection pathway. The intermediate electrode extends in the emission area and connects to both first and second electrodes, creating a unified electrical structure that improves connection reliability while maintaining manageable complexity through functional integration.
Solution Approach 2:
The intermediate electrode acts as an intermediary element between the first and second electrodes. It provides a bridging connection that enhances electrical connection reliability by distributing electrical pathways through multiple contact points, while the mediator structure itself remains relatively simple in form.
Data Source
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AI summary
A pixel may include: an emission area and a non-emission area; a first bank in the non-emission area, the first bank including an opening corresponding to the emission area; a first electrode, a second electrode, and an intermediate electrode that are spaced from each other; light emitting elements in the emission area, each of the light emitting elements including one end portion electrically connected to one of the first electrode, the second electrode, or the intermediate electrode and an other end portion electrically connected to another one of the first electrode, the second electrode, or the intermediate electrode; and a sub-bank located in the opening of the first bank, the sub-bank being spaced from the first bank. The intermediate electrode may be around at least a portion of the sub-bank.