Display Substrate Side Wiring Isolation With Epitaxial Blocking Wall
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Solution Overview
Problem
The existing Micro/Mini LED display technology faces challenges in manufacturing large-sized display substrates due to limitations in transferring technology, requiring multiple small-sized substrates to be spliced together, which can lead to short circuits and yield issues during the formation of side wirings.
Innovation Solution
A display substrate design with a base having a display area and an epitaxial area, featuring driving functional layers, binding electrodes, and a blocking wall that prevents metal ions from entering the display area during the formation of side wirings, ensuring electrical isolation and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple small-sized LED display substrates are spliced together to form a large-sized display substrate, then the display area can be enlarged, but the risk of short circuits and yield issues increases during side wiring formation
Solution Approach 1:
The substrate is divided into a display area and an epitaxial area, with binding electrodes positioned in the epitaxial area. This segmentation allows the display area to be optimized for light emission while the epitaxial area serves as a dedicated region for electrode placement and wiring, reducing interference and short circuit risks when splicing multiple substrates.
Solution Approach 2:
A blocking wall is introduced as an intermediary structure between the display area and the epitaxial area. This blocking wall prevents metal ions from migrating from the epitaxial area into the display area during side wiring formation, thereby eliminating the source of short circuits and improving yield without limiting display area expansion.
2Reliability
If side wirings are formed to electrically couple binding electrodes, then electrical connectivity is achieved, but metal ions may enter the display area causing short circuits
Solution Approach 1:
The blocking wall acts as a physical barrier and intermediary structure that allows electrical coupling to be achieved through controlled pathways while preventing metal ion migration. The blocking wall is positioned to span across potential migration paths from the epitaxial area to the display area, blocking harmful metal ions while permitting the formation of side wirings for electrical connectivity.
Solution Approach 2:
The harmful function of metal ion migration is extracted and isolated by positioning the blocking wall to specifically intercept metal ions. The blocking wall is designed to remove the harmful contamination pathway while preserving the desired electrical connectivity function through controlled wiring routes.
3Adaptability or versatility
If the epitaxial area is used for binding electrode placement, then electrode arrangement flexibility is improved, but metal ion migration to the display area becomes more likely
Solution Approach 1:
The substrate is segmented into distinct functional zones: the display area for light emission and the epitaxial area for electrode placement. This segmentation allows binding electrodes to be freely arranged in the epitaxial area to achieve desired electrical connections, while the blocking wall prevents metal ions from migrating from the epitaxial area into the display area, thus maintaining both flexibility and safety.
Solution Approach 2:
The blocking wall serves as a protective intermediary structure positioned between the epitaxial area and the display area. It allows the epitaxial area to maintain its flexibility for electrode arrangement while blocking the harmful metal ion migration pathway, thus protecting the display area without constraining electrode placement options.
Data Source
AI summary
A display substrate, a method for manufacturing a display substrate and a display device are provided, and the display substrate includes: a base having a first surface, a second surface and a side surface, the base includes a display area and an epitaxial area; a driving functional layer in the display area and first binding electrodes in the epitaxial area on the first surface, the first binding electrodes are coupled with the driving functional layer; second binding electrodes located on the second surface and coupled with the first binding electrodes through side wirings; a portion of each side wiring is located on the side surface; a blocking wall on the first surface and in the epitaxial area, an orthographic projection of the blocking wall on the base at least passes through spacing regions between every two adjacent first binding electrodes along an arrangement direction of the first binding electrodes.