Rounded-Corner Display Substrate Layout for Uniform Etching
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Solution Overview
Problem
Existing display technologies face issues with uneven etching in the blank regions of display substrates due to large blank areas between drive circuits, affecting signal transmission stability and display effectiveness.
Innovation Solution
The display substrate incorporates a drive circuit layer with a design that includes a gate drive circuit partially located within a second region, featuring dummy registers or vias, and a specific arrangement of signal lines to optimize signal transmission and reduce blank areas, ensuring uniform etching and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large blank areas are left between drive circuits in the non-display region, then circuit layout flexibility is improved, but etching uniformity deteriorates
Solution Approach 1:
The patent applies local quality by introducing dummy patterns (dummy gates, dummy active layers, dummy vias) specifically in the blank regions of the non-display area, while maintaining the original circuit design in the display region. This localized modification ensures that etching processes receive uniform exposure across the entire substrate, resolving the etching uniformity issue without affecting the functional circuit layout
Solution Approach 2:
The dummy patterns serve as intermediary elements that mediate between the conflicting requirements of layout flexibility and etching uniformity. These dummy structures fill the blank spaces and provide the necessary etching support without interfering with the actual signal transmission paths, thus acting as a bridge between the two opposing demands
2Manufacturing precision
If dummy patterns are added to blank regions, then etching uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the substrate into two distinct regions: the display region with functional circuits and the non-display region with dummy patterns. This segmentation allows the dummy patterns to be added as a separate, independent layer structure, minimizing their impact on the overall device complexity while still achieving the desired etching uniformity
Solution Approach 2:
The dummy patterns function as temporary or sacrificial structures that serve their purpose during the etching process and then become non-functional. These dummy elements are essentially 'disposable' components that enable manufacturing precision but do not contribute to the final device functionality, thus accepting the added structural complexity as a one-time manufacturing cost
3Area of stationary object
If gate drive circuit is partially located in the rounded corner region, then space utilization is improved, but signal transmission stability may deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-filling the blank regions in the rounded corner area with dummy patterns before the actual circuit layout is finalized. This preliminary structuring ensures that when the gate drive circuit is placed in the rounded corner region, the surrounding areas already have the necessary etching support, thus maintaining signal transmission stability while maximizing space utilization
Data Source
AI summary
Disclosed are a display substrate and a display apparatus, wherein the display substrate may include a base substrate including a display region and a non-display region, and a drive circuit layer disposed on the base substrate, the drive circuit layer includes a pixel drive circuit located in the display region and a gate drive circuit located in the non-display region; a boundary of the display region includes an arc-shaped boundary, a non-display region located on an outside of the arc-shaped boundary is referred to as a rounded corner region, and the rounded corner region includes a plurality of first regions and at least one second region; the gate drive circuit is configured to provide a drive signal to the pixel drive circuit, and is partially located within a first region, and the second region is located between adjacent first regions.