Comb-Electrode Shift Register to Prevent Display Channel Short Circuits
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Solution Overview
Problem
In display panels with ultra-narrow frames, the transition regions between transistors of different sizes are prone to channel short circuits due to photoresist accumulation during patterning, leading to abnormal signal output and defects like horizontal striations.
Innovation Solution
A shift register design featuring comb-shaped electrodes with inter-digital structures and a short circuit prevention region defined by orthographic projections of comb tooth portions and handle portions on the active layer, preventing photoresist accumulation and ensuring proper etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If transistors of different sizes are used in ultra-narrow frame display panels, then the frame width can be reduced, but channel short circuits occur due to photoresist accumulation in transition regions
Solution Approach 1:
The electrode structure is segmented into comb-shaped electrodes with multiple interdigitated fingers. This segmentation creates multiple discrete contact points while maintaining spacing, preventing photoresist accumulation in any single location and eliminating channel short circuits in transition regions between different transistor sizes
Solution Approach 2:
The comb-shaped electrode structure provides different local geometries in different regions. The interdigitated fingers create varying gap sizes and contact areas along the electrode length, allowing optimized local characteristics for different transistor sizes while maintaining overall reliability across the ultra-narrow frame display panel
2Ease of manufacture
If photoresist accumulation occurs during patterning, then channel short circuits occur, but standard patterning processes cannot be used
Solution Approach 1:
The comb-shaped electrode structure is designed in advance with predetermined finger spacing and gap dimensions. This preliminary design ensures that during subsequent patterning and etching processes, photoresist cannot accumulate in the spaced regions, preventing channel short circuits before they can occur
Solution Approach 2:
The spaced comb-shaped electrode structure acts as an intermediary form between the photoresist coating step and the etching step. The physical spacing created by the comb fingers prevents photoresist accumulation, serving as a mediator that eliminates the harmful effect while allowing standard patterning processes to proceed
Data Source
AI summary
The present disclosure provides a shift register, a gate driving circuit and a display panel. The shift register includes a transistor, which includes a gate electrode, a gate insulating layer, an active layer, a first electrode and a second electrode; the first and second electrode are of comb-shaped structures; the first electrode includes first and second comb tooth portions arranged at intervals, and a first comb handle portion connecting the first and second comb tooth portions; and comb tooth electrodes of the first comb tooth portions have a different length from those of the second comb tooth portions; the second electrode includes third and fourth comb tooth portions arranged at intervals, and a second comb handle portion connecting the third and fourth comb tooth portions; the first and third comb tooth portions form an inter-digital structure, the second and fourth comb tooth portions form an inter-digital structure.