Display Panel Gate Driver Repair After Start Line Cutoff
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Solution Overview
Problem
When a large-sized display substrate is cut to form a small-sized substrate, the start voltage line is often cut off, leading to improper functioning of the display panel due to the horizontal cutting of the gate driving circuit.
Innovation Solution
The display substrate includes a driving module with cascaded driving circuits and connection lines that overlap with the start voltage line, allowing for electrical connection through a control switch to maintain functionality even after cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If horizontal cutting is performed on a large-sized display substrate to form a small-sized substrate, then the display substrate can be reduced in size, but the start voltage line will be cut off and the display substrate cannot work properly
Solution Approach 1:
The connection line extends in the vertical direction (first direction) to overlap with the start voltage line in the horizontal projection, creating a three-dimensional routing path that avoids horizontal cutting. This dimensional change allows the signal path to bypass the cut region while maintaining electrical connection.
Solution Approach 2:
The connection line acts as an intermediary element between the start voltage line and the driving circuits. By extending the connection line vertically and having it overlap with the start voltage line horizontally, it serves as a mediator that maintains signal transmission even when the horizontal path is interrupted by cutting.
2Reliability
If the start voltage line is extended from the driving IC to provide start signals to gate driving circuits, then the gate driving circuits can function properly, but the line is vulnerable to being cut during horizontal cutting operations
Solution Approach 1:
The connection line is extended in the vertical dimension to create an overlap region with the start voltage line in the horizontal projection. This three-dimensional arrangement ensures that even if horizontal cutting is performed, the vertical extension maintains the electrical connection, making the system more robust against cutting operations.
3Reliability
If connection lines are added to overlap with the start voltage line and input cascade line, then electrical connection is maintained after cutting, but the device complexity increases
Solution Approach 1:
The connection line is extended in the vertical direction to create an overlap region with the start voltage line and input cascade line in the horizontal projection. This vertical extension is achieved through standard multilayer patterning processes, adding minimal complexity while significantly improving reliability after cutting.
Solution Approach 2:
The connection line serves multiple functions: it provides signal transmission paths for both the start voltage line and input cascade line, acts as a structural element for maintaining connections after cutting, and integrates with the existing driving circuit architecture. This multi-functionality reduces the need for separate dedicated components.
Data Source
AI summary
A display substrate, a repair method and a display device are provided. The display substrate includes a base substrate and a driving module arranged on the base substrate; the driving module includes a control switch and a driving circuit; an input terminal of an nth stage of driving circuit included in the driving module is electrically connected to an output terminal of an (n−m)th stage of driving circuit included in the driving module through an input cascade line; n and m are positive integers, and m is less than n; the driving module further includes at least one connection line, the connection line extends along a first direction. The repairing method includes: when previous c stages of driving circuits included in the driving module in the display substrate are cut off, controlling, by the control switch, to connect the connection line and the input cascade line.