Display Substrate Lead Routing for Narrower OLED Bezels
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Solution Overview
Problem
The challenge in OLED display products is the large space occupied by the fan-out area, which hinders the narrowing of the display area bezel, particularly the lower bezel, due to the layout of circuit connections.
Innovation Solution
The display substrate design includes a base substrate with a display area and peripheral area, where the leads are routed to overlap with light-emitting elements in the display area, and pixel driving circuits are arranged to minimize overlap with data lines, allowing leads to be positioned closer to the display area, thereby narrowing the bezel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If leads are routed through the peripheral area only, then electrical connectivity is maintained, but the lower bezel occupies larger space
Solution Approach 1:
The lead routing is moved from a two-dimensional planar path in the peripheral area to a three-dimensional path that passes through the light-emitting element layer. The leads are positioned to overlap with light-emitting elements in the planar view, utilizing the vertical stacking dimension to reduce the horizontal space required for lead routing, thereby narrowing the bezel area.
2Area of stationary object
If leads are positioned to overlap with light-emitting elements, then bezel width is reduced, but electrical connectivity between leads and data lines must be maintained
Solution Approach 1:
The leads are nested within the projection area of the light-emitting elements, with the leads positioned at the side of the light-emitting elements close to the base substrate. This nested arrangement allows the leads to pass through the light-emitting element layer while maintaining electrical connectivity to the data lines, effectively utilizing the space occupied by light-emitting elements to reduce bezel width without compromising connectivity.
3Ease of manufacture
If pixel driving circuits are arranged to minimize overlap with data lines, then manufacturing complexity is reduced, but display area utilization is affected
Solution Approach 1:
The display area is segmented into a first display area and a second display area. The first pixel driving circuits are arranged in the second display area to minimize overlap with data lines, simplifying the circuit layout and manufacturing process. The segmentation allows different regions to serve different functions, with the first display area potentially used for other purposes while the second display area accommodates the pixel driving circuits with optimized spacing.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a base substrate, at least one group of contact pads, a plurality of first light-emitting elements, a plurality of first pixel driving circuits, a plurality of connecting traces, a plurality of data lines and a plurality of leads. The display area includes a first display area and a second display area; the first light-emitting elements are located in the first display area; the first pixel driving circuits are located in the second display area; the leads are located in the first display area and the peripheral area, and connect the data lines and the at least one group of contact pads; orthographic projections of the first light-emitting elements on a substrate surface of the base substrate are at least partly overlapped with orthographic projections of the leads on the substrate surface of the base substrate.