Display Substrate Overlap Layout for Selective Short-Circuit Repair
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Solution Overview
Problem
In display substrates, short circuits between scanning lines and connection lines in driving circuits can lead to dark lines and low display product yield due to the sharing of nodes and overlapping structures in driving circuits.
Innovation Solution
The display substrate design includes independent overlapping portions between connection lines and scanning lines, allowing for selective cutting off of these lines to prevent short circuits, with specific line widths and distances to ensure normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the driving circuit adopts structure sharing with common first node and second node for multiple stages, then the border width is reduced and integration is improved, but the risk of short circuit increases and reliability deteriorates
Solution Approach 1:
The connection line between the first node and output circuit is segmented into multiple independent segments. Each segment can be independently controlled and cut off using separate control lines. This segmentation allows the system to maintain structure sharing for compactness while reducing short circuit risk by isolating potential failure points into smaller, manageable segments that can be independently managed.
2Device complexity
If connection lines overlap with scanning lines in the same layer to reduce layer count, then manufacturing complexity is reduced, but short circuit risk increases due to overlapping portions
Solution Approach 1:
An insulating layer is introduced as an intermediary between the connection line and scanning line at their overlapping portions. This insulating layer prevents direct electrical contact between the two conductors while allowing them to occupy the same physical layer, thus maintaining low manufacturing complexity while eliminating the short circuit risk that would otherwise result from the overlap.
3Productivity
If a short circuit occurs in the connection line, then the driving circuit fails and display yield decreases, but with multiple independent overlapping portions and control lines, the ability to selectively cut and maintain functionality is improved
Solution Approach 1:
Multiple control lines are pre-configured during manufacturing, each corresponding to a specific segment of the connection line. These control lines are prepared in advance and can be selectively activated to cut specific segments if short circuits are detected. This preliminary preparation enables rapid response to failures without requiring complex post-manufacturing modifications, thus improving display yield while managing the added control structure.
Data Source
AI summary
A display substrate including a base substrate and a driving module arranged on the base substrate, the driving module includes at least one driving unit, and the driving unit includes N stages of driving circuits; N is a positive integer, n is a positive integer less than or equal to N; the nth stage of driving circuit includes a (2n−1)th stage of output circuit, a 2nth stage of output circuit and a first node control circuit; the first node is electrically connected to the (2n−1)th stage of output circuit and the 2nth stage of output circuit respectively through a first connection line; the driving module also includes a scanning line; there are at least two mutually independent overlapping portions between the orthographic projection of the first connection line on the base substrate and the orthographic projection of the scanning line on the base substrate.