Display Substrate Shift Register Layout for Narrower Bezels
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Solution Overview
Problem
The layout of shift register units in AMOLED display panels results in a larger bezel width due to inefficient utilization of space between signal lines and transistors, which hinders the development of narrow bezel designs.
Innovation Solution
The layout of shift register units is optimized by adjusting the arrangement of transistors and signal lines, removing redundant voltage signal lines, and utilizing spaces between transistors more efficiently, reducing the transverse width of the shift register units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the scan driving circuit is arranged in the edge area of the AMOLED display panel, then the pixel circuit can be located in the display area, but the bezel width becomes larger
Solution Approach 1:
The patent changes the spatial arrangement by having the signal output line extend in a second direction (perpendicular to the first direction) instead of parallel to the voltage signal lines. This dimensional change allows more efficient use of the edge area space, reducing the transverse width of shift register units and consequently the bezel width while maintaining the display area.
Solution Approach 2:
The patent segments the shift register unit into distinct functional components (output circuit, signal output line, voltage signal lines) with optimized spatial relationships. By positioning the output circuit between the first and second voltage signal lines and extending the signal output line in a perpendicular direction, the layout efficiently divides and utilizes the edge area space.
2Device complexity
If the signal output line extends parallel to the voltage signal lines, then the layout is simple, but the transverse width of shift register units is larger
Solution Approach 1:
The signal output line extends in a second direction that is perpendicular to the first direction in which the voltage signal lines extend. This orthogonal arrangement in another dimension reduces the transverse width of the shift register unit while maintaining manageable layout complexity through systematic positioning of components.
3Reliability
If redundant voltage signal lines are kept, then the circuit function is ensured, but the space utilization is inefficient
Solution Approach 1:
The patent removes redundant voltage signal lines from the shift register unit layout, keeping only the essential first and second voltage signal lines that are necessary for circuit function. This extraction of unnecessary elements improves space utilization while maintaining the required circuit functionality through the optimized arrangement of remaining components.
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.