OLED Display Device with Overlapping Electrodes for Narrower Frames
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Solution Overview
Problem
The challenge in achieving a higher screen ratio in OLED display products lies in reducing the size of the frame surrounding the display screen, particularly the bottom frame where the data driving circuit is located, which occupies valuable space.
Innovation Solution
The design of a display substrate where the first electrodes of the light-emitting elements of the sub-pixels overlap with the pixel driving circuits on the same side of the reset signal lines, allowing the electrodes to be positioned away from the frame, thereby reducing the frame size by optimizing the layout of the electrodes and signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the first electrodes are positioned away from the frame by overlapping with pixel driving circuits, then the frame size is reduced, but the layout complexity increases
Solution Approach 1:
The patent utilizes the vertical dimension (z-axis) by allowing orthographic projections to overlap, transforming a 2D layout problem into a 3D spatial arrangement. This enables the first electrodes to be positioned in the display region while maintaining electrical connection to pixel driving circuits, effectively reducing frame size without increasing horizontal layout complexity
Solution Approach 2:
The patent merges the spatial occupation of first electrodes with pixel driving circuits by positioning their orthographic projections to overlap. This combining of functions in the same spatial footprint allows the electrodes to be located away from the frame while sharing space with driving circuits, thereby reducing frame size without adding additional layout complexity
2Length of stationary object
If the first electrodes are positioned on the same side of reset signal lines, then the frame size is reduced, but the routing complexity increases
Solution Approach 1:
By allowing orthographic projections to overlap in the vertical dimension, the patent enables first electrodes to be positioned away from the frame while maintaining routing connections through the pixel driving circuits. This spatial arrangement simplifies routing by eliminating the need for electrodes to extend to the frame edge
Solution Approach 2:
The pixel driving circuits serve as intermediaries that facilitate the connection between reset signal lines and first electrodes. By positioning electrodes on the same side of reset signal lines and using driving circuits as mediators, the patent achieves simplified routing while maintaining all necessary electrical connections
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.