Scan Driving Circuit Layout for Narrow-Bezel AMOLED Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The layout of shift register units in AMOLED display panels results in a larger bezel width, which is not conducive to the development of narrow bezel displays due to inefficient use of space between signal lines and transistors, leading to increased transverse width and reduced bezel width.
Innovation Solution
The layout of shift register units is optimized by adjusting the arrangement of transistors and signal lines, removing one high-voltage signal line, and utilizing spaces between transistors more efficiently, reducing the transverse width by fully utilizing the available space between adjacent shift register units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the scan driving circuit is arranged in the edge area of the AMOLED display panel, then the circuit can be isolated from the display area, but the bezel width increases
Solution Approach 1:
The patent utilizes the space between signal lines and transistors in the vertical dimension (between adjacent shift register units) to reduce the horizontal transverse width. By optimizing the layout arrangement of transistors and signal lines within the available space, the circuit maintains its functional isolation while reducing the bezel width occupied by the scan driving circuit.
Solution Approach 2:
The patent applies different layout strategies to different regions of the shift register unit. Specifically, the output circuit is positioned on one side of the voltage signal line while the input circuit is positioned on the other side, creating an asymmetric local arrangement that efficiently utilizes the space between adjacent shift register units and reduces the overall transverse width.
2Reliability
If conventional layout of shift register units is used, then circuit functionality is maintained, but space utilization between signal lines and transistors is inefficient
Solution Approach 1:
The patent changes the spatial parameters of the circuit layout by removing one high-voltage signal line and repositioning the remaining signal lines and transistors. This parameter change optimizes the use of available space between signal lines and transistors, reducing the transverse width while maintaining all necessary circuit functionalities including voltage signal transmission and clock signal transmission.
3Length of stationary object
If the transverse width of shift register units is reduced, then bezel width decreases, but layout complexity increases
Solution Approach 1:
The patent segments the shift register unit into distinct functional regions: an output circuit portion, a voltage signal line, and an input circuit portion. Each segment is independently optimized and positioned to efficiently utilize the available space. This segmentation allows for systematic layout optimization that reduces transverse width while maintaining clarity in circuit design and fabrication.
Data Source
AI summary
A display substrate includes a scan driving circuit and a display area. The scan driving circuit includes a plurality of shift register units, a first voltage signal line, a second voltage signal line, a first clock signal line, and a second clock signal line, all of which extend in a first direction. The display area includes at least one driving transistor configured to drive a light-emitting element for display. At least one of the plurality of shift register units includes an output circuit and a signal output line, wherein the output circuit is coupled to the first voltage signal line, the second voltage signal line, and the signal output line, and the signal output line extends in a second direction intersecting the first direction. The output circuit includes a transistor that is provided between the first voltage signal line and the second voltage signal line.