AMOLED Display Substrate Bezel Width Reduction via Vertical Shift Register
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Solution Overview
Problem
The existing AMOLED display panel technologies face challenges in minimizing the bezel width due to the arrangement of the scanning driving circuit, which affects the compactness and efficiency of the display substrate.
Innovation Solution
The scanning driving circuit is optimized by arranging shift register units with specific transistor and capacitor configurations, including output capacitors and transistors, where the distances between electrodes and signal lines are carefully managed to reduce the overall width, allowing for a more compact and efficient layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the scanning driving circuit is arranged at the peripheral region of the AMOLED display panel, then the display panel can be manufactured with existing technologies, but the bezel width increases due to the space required for the scanning driving circuit
Solution Approach 1:
The patent repositions the scanning driving circuit from the traditional peripheral horizontal arrangement to a vertical arrangement along the left edge of the display panel. This dimensional change in circuit layout allows the scanning signals to be transmitted vertically to pixel rows, reducing the horizontal bezel width while maintaining manufacturability with existing AMOLED fabrication processes
Solution Approach 2:
The scanning driving circuit is divided into multiple independent shift register units (first shift register unit, second shift register unit, etc.) that can be independently arranged and connected. This segmentation allows flexible spatial distribution of the scanning function, enabling compact vertical arrangement along the peripheral region and reducing overall bezel occupation
2Ease of manufacture
If the shift register units are arranged with conventional spacing, then the circuit components can be easily connected, but the transverse width of the scanning driving circuit increases
Solution Approach 1:
Adjacent shift register units share common conductive structures, such as the second electrode of one transistor serving as the first electrode of the next transistor, and shared capacitor arrangements. This merging reduces redundant components and minimizes the transverse width required for each shift register unit while maintaining proper electrical connections
Solution Approach 2:
The patent employs multi-layer conductor arrangements where signal lines and power lines are distributed across different layers (first conductor layer, second conductor layer, third conductor layer). This vertical stacking in the z-dimension reduces the horizontal transverse width required for circuit interconnections between shift register units
Data Source
AI summary
A display substrate includes a scanning driving circuit arranged on a base substrate. The scanning driving circuit includes a plurality of shift register units and a first voltage signal line extending in a first direction. At least one shift register unit includes an output capacitor and a first transistor, a first electrode thereof is coupled to the first voltage signal line, and a second electrode thereof is coupled to an electrode plate of the output capacitor. A maximum distance between an orthogonal projection of the first electrode/second electrode of the first transistor onto the base substrate and an orthogonal projection of the first voltage signal line/the electrode plate of the output capacitor onto the base substrate is smaller than a first/second predetermined distance in a second direction, and the first direction intersects the second direction.