Driving Backplane Structure for Corrosion-Resistant Layer Overlap
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Solution Overview
Problem
Existing miniature light-emitting diode display backplanes suffer from short circuits due to electrochemical corrosion and particle extrusion at overlapping regions between conductive layers, leading to abnormal display issues like black dots.
Innovation Solution
A driving backplane structure is introduced, featuring a substrate with a first conductive layer, a first organic film layer with via holes, a first inorganic film layer, and a second conductive layer. The first inorganic film layer is positioned between the second conductive layer and the first organic film layer, preventing electrochemical growth and particle extrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first conductive layer and a second conductive layer are arranged in an overlapping region to improve electrical connection, then electrical conductivity is improved, but electrochemical corrosion and particle extrusion occur causing short circuits
Solution Approach 1:
An inorganic film layer is introduced as an intermediary barrier between the first conductive layer and the second conductive layer. This inorganic film layer prevents direct contact between the conductive layers, thereby blocking electrochemical corrosion and particle extrusion while still allowing electrical connection through via holes in the organic film layer.
Solution Approach 2:
The patent uses a composite structure consisting of multiple layers including organic film layers, inorganic film layers, and conductive layers. The combination of different materials (organic and inorganic) provides both electrical connectivity and protection against harmful effects, resolving the contradiction between conductivity and reliability.
2Reliability
If an inorganic film layer is added to prevent electrochemical corrosion and particle extrusion, then reliability is improved, but device complexity increases
Solution Approach 1:
The inorganic film layer serves multiple functions simultaneously: it acts as a barrier against electrochemical corrosion, prevents particle extrusion, and provides structural support. By combining multiple protective functions into a single layer, the patent improves reliability without proportionally increasing device complexity.
Data Source
AI summary
A driving backplane, a manufacturing method thereof, a light-emitting substrate are provided. In the driving backplane, a first conductive layer on a substrate; a first organic film layer is between the first conductive layer and second conductive layer, the first organic film layer has first via holes; a first inorganic film layer is on one side of first organic film layer away from the substrate; the second conductive layer is on one side of first inorganic film layer away from first organic film layer, the second conductive layer and the first conductive layer are connected through the first via holes; orthographic projections of the first conductive layer and second conductive layer have an overlapping region, the overlapping region includes a region including orthographic projection of the first via holes, and a first region, an orthographic projection of the first inorganic film layer covers parts of the first region.