Scan Driving Circuit Insulation for Display Devices
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Solution Overview
Problem
Existing display devices face reliability issues due to the vulnerability of scan driving circuits to electrical interference and manufacturing processes, which can lead to short-circuits between control and carry wirings.
Innovation Solution
The implementation of a scan driving circuit with multiple stages connected through carry wirings, where control and carry wirings are insulated by multiple layers, preventing electrical interference and ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If control wiring and carry wiring are arranged close to each other to reduce device area, then area is reduced, but electrical interference and short-circuit risk increase
Solution Approach 1:
The patent transitions from planar wiring arrangement to three-dimensional layered structure by placing control wiring and carry wiring on different layers (first layer and second layer respectively), separated by insulation layers. This vertical separation in the third dimension eliminates electrical interference while maintaining compact horizontal footprint, resolving the contradiction between area reduction and reliability improvement.
Solution Approach 2:
The patent introduces insulation layers as intermediary elements between control wiring and carry wiring. These insulation layers act as mediators that physically separate the two wiring types, preventing direct electrical contact and interference while allowing the wirings to be positioned close together horizontally, thus maintaining small device area while ensuring electrical isolation.
2Reliability
If multiple insulation layers are added between control wiring and carry wiring to prevent short-circuits, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the insulation layer formation process with the existing multi-layer manufacturing process of the display device. The insulation layers are integrated into the standard fabrication sequence alongside other functional layers, so that while additional insulation layers are added for reliability, the overall manufacturing complexity is minimized by merging processes rather than adding separate dedicated steps.
Data Source
AI summary
A display device includes a base layer, a pixel disposed on the base layer, and a scan driving circuit disposed on the base layer and connected to the pixel. The scan driving circuit includes a plurality of stages, a jth stage among the plurality of stages is connected to at least one adjacent stage through carry wirings. The jth stage includes a plurality of control transistors connected to a first control node, and a control wiring connecting the first control node and the plurality of control transistors. Two or more insulation layers are arranged between the control wiring and the carry wirings.