AMOLED Display Motherboard Layout for Etching Defect Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the manufacturing of AMOLED display substrates, the structures of virtual pixels, such as virtual pixel circuits and virtual anodes, are often disposed outside the valid display area, leading to defects like dark spots due to the etching process, which affects the display uniformity.
Innovation Solution
A display motherboard design that includes a substrate with a valid area and an edge area, where the edge area has virtual electrodes that overlap orthographic projections of multiple power lines, reducing the area for etching and minimizing defects. The design also includes a pixel defining layer, light emitting layers, and a second electrode layer to enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If virtual pixel circuits and virtual anodes are disposed outside the valid display area, then the etching process can be performed, but defects like dark spots occur due to etching particles affecting display uniformity
Solution Approach 1:
The patent converts the harmful effect of etching particles by designing virtual electrodes that actively capture and absorb these particles during the etching process. The virtual electrodes serve as traps for etching debris, preventing the particles from settling on the display area and causing dark spots, thus transforming the harmful etching byproducts into a controlled situation that benefits display uniformity
Solution Approach 2:
The virtual electrodes act as an intermediary element between the etching process and the display area. They intercept etching particles before these particles can reach the display region, serving as a protective mediator that allows the etching process to proceed while preventing contamination of the display uniformity
2Manufacturing precision
If virtual electrodes overlap multiple power lines, then etching area is reduced and defects minimized, but manufacturing complexity increases
Solution Approach 1:
The virtual electrodes perform multiple functions simultaneously: they serve as structural elements for etching support, act as particle traps to prevent defects, and function as conductive elements overlapping power lines to minimize etching area. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process despite the complex arrangement
3Manufacturing precision
If virtual electrodes are disposed in edge area, then display uniformity is improved by reducing etching defects, but the area for etching is reduced
Solution Approach 1:
The patent applies local quality by concentrating virtual electrodes specifically in the edge area where they are most effective for capturing etching particles. The display area maintains its optimal characteristics for light emission, while the edge area is optimized for particle trapping. This localized differentiation allows the etching process to proceed with minimal impact on display uniformity
Data Source
AI summary
A display motherboard and a manufacturing method of a display substrate are provided. The display motherboard includes: a substrate including a valid area and an edge area, the valid area including a plurality of panel areas and a to-be-cut area, and the panel area including a display area and a frame area; multiple first power lines in each display area and the edge area and extending along a first direction; multiple first display electrodes in each display area and multiple virtual electrodes in the edge area, the first display electrodes and the virtual electrodes being in the same layer; wherein an orthographic projection of each first display electrode on the substrate overlaps an orthographic projection of at most one first power line on the substrate, and an orthographic projection of each virtual electrode on the substrate overlaps orthographic projections of at least two first power lines on the substrate.