Display Substrate Data Line Segmentation for Short Circuit Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display technology, there is a risk of short circuits between the electrode of the driving capacitor and the data line during the etching process, which affects the yield and reliability of display substrates.
Innovation Solution
The display substrate design includes a reinforced conductor structure in the same layer as the gate of the driving transistor, with data lines divided into sub-segments of different widths, and reinforced conductor structures electrically coupled to the data lines, reducing the risk of short circuits and providing a maintenance/repair space by overlapping projections and insulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the data line and driving capacitor electrode are arranged in the same layer with overlapping projections, then the space utilization is improved, but the risk of short circuit during etching process increases
Solution Approach 1:
The patent introduces a reinforced conductor structure as an intermediary element between the data line and the driving capacitor electrode. This reinforced conductor is positioned in the same layer as the gate of the driving transistor and provides both mechanical support and electrical connection, while the overlapping region is protected by interlayer insulation layers that prevent direct contact between the data line and capacitor electrode during etching, thus resolving the short circuit risk while maintaining space efficiency
Solution Approach 2:
The patent resolves the contradiction by transitioning from a two-dimensional planar arrangement to a three-dimensional layered structure. The interlayer insulation layers create vertical separation between conductive elements that would otherwise be in direct contact in the same plane, allowing overlapping projections in the horizontal dimension while preventing short circuits through vertical insulation
2Productivity
If the first sub-data line segment width is reduced to overlap with the first electrode, then the pixel circuit density is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The patent applies beforehand cushioning by introducing interlayer insulation layers between the data line and the driving capacitor electrode before the etching process. These insulation layers act as a protective cushion that compensates for potential etching deviations, allowing the first sub-data line segment to be narrowed for higher density while maintaining manufacturing feasibility through the protective insulation barrier
3Reliability
If the reinforced conductor structure is added to reduce short circuit risk, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The reinforced conductor structure serves multiple functions simultaneously: it provides mechanical reinforcement to the gate structure, establishes electrical connection between the data line and the pixel circuit, and acts as a positioning reference during fabrication. By consolidating these multiple functions into a single structural element, the patent improves reliability without proportionally increasing device complexity
Data Source
AI summary
The disclosure provides a display substrate, a method for fabricating the same, a display device. The display substrate includes a base and a display function layer on the base. The display function layer includes pixel circuits arranged in first and second directions, and data lines in the second direction. Each pixel circuit includes a driving capacitor and a driving transistor, a first electrode of the driving capacitor is in a same layer as the data lines; at least one data line includes at least one first sub-data line segment and at least one second sub-data line segment, a width of the first sub-data line segment is less than that of the second sub-data line segment, an orthographic projection of the first sub-data line on a virtual straight line in the second direction at least partially overlaps with that of the first electrode closest thereto on the virtual straight line.