Display Substrate Electrode Layout for High-PPI Aperture and Uniformity
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Solution Overview
Problem
Conventional display panels face challenges in achieving high aperture ratio and uniformity, particularly when the number of pixels per inch exceeds 300, leading to reduced transmittance and display uniformity due to sub-pixel design limitations.
Innovation Solution
The display substrate design includes a dual-gate line configuration with specific arrangements of sub-pixels, data lines, and common electrode lines, featuring protrusions on the common electrode lines and strategically placed spacers to optimize the aperture ratio and uniformity, while maintaining high pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels per inch is increased to achieve high resolution, then the display resolution is improved, but the aperture ratio is reduced leading to lower transmittance
Solution Approach 1:
The common electrode line is segmented into multiple common electrode line segments with protrusions between them. This segmentation allows the pixel electrode to be positioned more precisely relative to the common electrode, optimizing the overlap area and improving transmittance while maintaining high pixel density
Solution Approach 2:
Protrusions are added at specific locations between common electrode line segments to create localized regions for precise pixel electrode positioning. This local structural enhancement ensures optimal electrical connection and light transmission in critical areas without affecting the entire electrode structure
2Measurement precision
If the number of pixels per inch is increased to achieve high resolution, then the display resolution is improved, but the display uniformity deteriorates
Solution Approach 1:
The common electrode line structure employs asymmetric design with protrusions positioned at specific intervals and orientations. This asymmetric configuration, combined with corresponding pixel electrode arrangements, ensures uniform electrical field distribution across the display while accommodating high pixel density, thereby maintaining display uniformity
Solution Approach 2:
The patent introduces a vertical dimension to the common electrode line structure by adding protrusions that extend toward the pixel electrode. This three-dimensional configuration allows for optimized electrical connection and field distribution, ensuring uniform display performance at high pixel densities
3Ease of manufacture
If conventional sub-pixel design is used, then the manufacturing process is simple, but the aperture ratio is limited and cannot exceed certain thresholds
Solution Approach 1:
The common electrode line is divided into multiple segments with protrusions, allowing the pixel electrode to span across these segments. This segmentation enables larger aperture ratios by optimizing the electrode layout without complicating the manufacturing process, as the segmented structure can be formed using standard photolithography techniques
Solution Approach 2:
The protrusions on the common electrode line serve multiple functions: they provide positioning references for the pixel electrode, create optimal electrical connection areas, and maintain structural integrity. This multi-functionality achieves high aperture ratios without requiring complex manufacturing processes
Data Source
AI summary
The disclosure provides display substrate and display panel, and belongs to field of display technology. The display substrate includes base substrate; and gate lines, data lines and sub-pixels on base substrate. Sub-pixels form first pixel groups arranged side by side along first direction and second pixel groups arranged side by side along second direction; first region is between any two adjacent first pixel groups, and second region is between any two adjacent second pixel groups; common electrode line is in at least a portion of the first regions, and common electrode line and data line are in different first regions; and common electrode line includes common electrode line segments and protrusions each coupled between two common electrode line segments, a width of protrusion in any direction is larger than that of common electrode line segment in first direction; and protrusion is in the second region.