Pixel Electrode Bridge Layout for Reliable Display Connectivity
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Solution Overview
Problem
Existing display devices face challenges in achieving improved reliability and efficiency in pixel design, particularly in the electrical connections and materials used in the emission and non-emission areas.
Innovation Solution
The pixel design incorporates a unique configuration with alignment electrodes, bridge patterns, and pixel electrodes, utilizing different materials for alignment and bridge patterns, and includes insulating layers with contact holes to facilitate electrical connections, enhancing reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same material is used for both alignment electrodes and bridge patterns, then the manufacturing process is simpler, but the electrical connectivity and reliability are insufficient
Solution Approach 1:
The patent applies different materials to different components based on their specific functional requirements. Alignment electrodes use opaque conductive material optimized for electrical connection to the light emitting element, while bridge patterns use transparent conductive oxide optimized for maintaining alignment in the non-emission area. This local differentiation of material properties resolves the contradiction by improving electrical connectivity where needed without unnecessarily complicating the overall device structure.
Solution Approach 2:
The patent employs a composite material strategy by combining opaque conductive material and transparent conductive oxide in the same pixel structure. Each material is selected for its specific properties: opaque material for efficient electrical conduction in emission areas, and transparent oxide for maintaining structural integrity and alignment in non-emission areas. This composite approach enables improved reliability while managing device complexity through purposeful material selection.
2Reliability
If contact holes are disposed in the emission area, then electrical connection is achieved, but light emission is blocked and display quality deteriorates
Solution Approach 1:
The patent segments the pixel structure into emission areas and non-emission areas with distinct functional assignments. Contact holes are strategically placed only in non-emission areas, separating the electrical connection function from the light emission function. This spatial segmentation allows electrical connections to be established without compromising light emission quality, as the contact holes are confined to regions that do not contribute to the displayed image.
Solution Approach 2:
The patent resolves the conflict by transitioning the contact hole placement to a different spatial dimension - specifically, to the non-emission area layer. Instead of placing contact holes in the emission area where they would block light, the design utilizes the non-emission area as an alternative location for electrical connections. This dimensional repositioning maintains electrical connectivity while preserving light emission integrity.
3Stability of the object's composition
If alignment electrodes extend into the non-emission area, then alignment is maintained, but electrical connection to pixel electrodes becomes difficult
Solution Approach 1:
The patent introduces bridge patterns as intermediary structures that facilitate electrical connection between the alignment electrodes and pixel electrodes. The bridge patterns are disposed in the non-emission area and serve as conductive pathways, allowing electrical signals to be transmitted without requiring the alignment electrodes themselves to extend into regions that would complicate manufacturing. This intermediary structure resolves the contradiction by providing a dedicated connection route that maintains alignment stability while enabling ease of manufacture.
Data Source
AI summary
A pixel includes an emission area and a non-emission area; first to fourth alignment electrodes spaced apart from each other in the emission area and an area of the non-emission area; an insulating layer disposed on the first to fourth alignment electrodes; first to fourth bridge patterns disposed on the insulating layer in the non-emission area; a bank disposed on the first to fourth bridge patterns in the non-emission area, and including a first opening and a second opening; first and second pixel electrodes disposed in the emission area; and light emitting elements disposed in the emission area, and electrically connected with the first and second pixel electrodes. The first alignment electrode, the first bridge pattern, and the first pixel electrode are electrically connected to each other. The third alignment electrode, the third bridge pattern, and the second pixel electrode are electrically connected to each other.