OLED Display Substrate Overlap Layout for Narrow Lower Frames
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Solution Overview
Problem
The challenge in achieving a narrow frame in OLED display panels is primarily due to the design of the bottom frame, where reducing the size of the data driving circuit is necessary to minimize the frame size.
Innovation Solution
The proposed solution involves a display substrate design where the first electrodes of the light-emitting elements partially overlap with the pixel driving circuits on the same side of the reset signal lines, allowing for a more compact layout that does not occupy space in the lower frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the data driving circuit is reduced in size to achieve a narrow frame, then the frame size is minimized, but the layout complexity and difficulty of routing signal lines increase
Solution Approach 1:
The patent utilizes the vertical dimension by allowing the first electrode to extend in the vertical direction and overlap with the pixel driving circuit in the vertical projection. This three-dimensional arrangement enables signal lines to be routed more efficiently and reduces the horizontal space required for the data driving circuit, thereby achieving a narrower frame without significantly increasing layout complexity.
Solution Approach 2:
The first electrode is designed to overlap with the pixel driving circuit in the vertical projection, creating a nested arrangement where components are positioned to utilize the same horizontal space at different vertical levels. This nesting reduces the overall horizontal footprint of the display substrate, contributing to frame size reduction while maintaining functional integrity.
2Length of stationary object
If the first electrode overlaps with the pixel driving circuit, then the lower frame size is reduced, but the risk of electrical interference or short circuit increases
Solution Approach 1:
The patent introduces an insulating layer between the first electrode and the pixel driving circuit in regions where they overlap. This intermediary insulating structure prevents direct electrical contact while allowing the components to maintain their overlapping spatial arrangement, thus reducing lower frame size without compromising electrical isolation or reliability.
Solution Approach 2:
The overlapping arrangement of the first electrode with the pixel driving circuit is implemented only in specific local regions where it contributes to frame size reduction, rather than throughout the entire structure. This localized application of the overlapping design allows the benefit of reduced frame size to be achieved without unnecessarily increasing the risk of electrical interference in areas where overlap is not required.
Data Source
AI summary
A display substrate and a display device. The display substrate includes a base substrate and multiple reset signal lines. The base substrate includes a display area; each of sub-pixels includes a pixel driving circuit and a light emitting element; the light emitting element includes a light emitting area and a first electrode; the pixel driving circuit is configured to drive the light emitting element to emit light; orthographic projections of the first electrodes of the light emitting elements of the sub-pixels of multiple pixel units on the substrate surface of the base substrate at least partially overlap with orthographic projections of the pixel driving circuits of the sub-pixels of the multiple pixel units on the substrate surface of the base substrate, and are located on the same side as the reset signal lines electrically connected to the pixel driving circuits of the sub-pixels of the multiple pixel units.