Display Pixel Segmented Anode Bridging Lines
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Solution Overview
Problem
Conventional display tiles using flexible substrates face issues with poor displaying quality and dead spots due to the arrangement of column electrodes and vias, which are not suitable for large size and flexible substrates, leading to manufacturing problems like low yield and unstable current injection.
Innovation Solution
A display pixel design featuring separate anode elements connected by conductive bridging lines and upper via units, allowing for increased current injection paths and reducing the need for precise layer-to-layer alignment, enabling effective current injection across the entire length of anode elements even if they break during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional column electrode and via arrangement is used, then manufacturing is simpler, but display quality deteriorates and dead spots occur on flexible substrates
Solution Approach 1:
The anode is divided into multiple separate anode elements (first anode element, second anode element, etc.) that can be independently connected to column lines through multiple via units. This segmentation allows current to be injected at multiple points along the anode, ensuring uniform current distribution and eliminating dead spots on flexible substrates.
Solution Approach 2:
The patent introduces a multi-dimensional connection structure by adding vertical via units that connect horizontal column lines to anode elements at different locations. This creates a three-dimensional electrode arrangement that improves current injection effectiveness compared to conventional two-dimensional planar arrangements.
2Manufacturing precision
If precise layer-to-layer alignment is required, then manufacturing precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent incorporates alignment marks and design features that enable preliminary alignment during the manufacturing process. The column lines and anode elements are designed with built-in alignment references that guide the stacking process, reducing the need for high-precision alignment while maintaining manufacturing quality.
Solution Approach 2:
The patent uses insulating layers and alignment mark structures as intermediary elements that facilitate the alignment process. These intermediaries provide visual and physical references that simplify the layer-to-layer alignment procedure, making manufacturing easier without sacrificing precision.
3Reliability
If single current injection path is used, then device complexity is reduced, but reliability decreases when anode elements break
Solution Approach 1:
The current injection system is segmented into multiple independent paths, each connecting a column line to a specific anode element through via units. This segmentation ensures that if one current injection path fails due to anode element breakage, other paths remain functional and can still drive the display.
Solution Approach 2:
The patent implements local current injection by connecting column lines to specific segments of anode elements through strategically positioned via units. This local quality approach ensures that current is injected where needed, and failure in one local region does not affect the entire display functionality.
Data Source
AI summary
A display pixel includes: a first stack including a transparent anode layer having first and second anode elements, a cathode layer, and a functional layer disposed between the anode layer and the cathode layer; a second stack disposed on the first stack and including an insulating layer and a conductive column line disposed on a surface of the insulating layer; a conductive bridging line disposed in the first stack and connected to the first and second anode elements; and an upper via unit including an upper contact via extending from the conductive column line into the first stack and connected to the bridging line or one of the first and second anode elements.