Display Substrate Bezel Reduction via 3D Circuit Stacking
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Solution Overview
Problem
In display technologies, particularly for wearable devices, there is a challenge in minimizing the bezel area to achieve a higher screen-to-body ratio while efficiently integrating driving circuits without obstructing the display region.
Innovation Solution
A display substrate design with a circuit region that includes alternately disposed driving unit groups, multiplexing unit groups, and test unit groups, along with a signal line protection unit and connection sub-region, to optimize the layout and reduce the bezel area by efficiently routing signal lines and protecting against electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If driving circuits are disposed outside the display region, then the display region can be maximized, but the bezel area increases
Solution Approach 1:
The patent transitions from conventional planar circuit placement to a three-dimensional stacked architecture. Driving circuits are positioned in a layer above the display region through a carrier substrate, enabling vertical integration. This dimensional change allows the display region to extend to the edges of the substrate while driving circuits occupy the bezel area in three-dimensional space, effectively resolving the contradiction between maximizing display area and minimizing bezel area.
2Adaptability or versatility
If circuit region is expanded to accommodate driving circuits, then driving functionality is achieved, but the screen-to-body ratio decreases
Solution Approach 1:
The patent implements vertical stacking where the carrier substrate with driving circuits is positioned above the display substrate. This three-dimensional arrangement allows driving circuits to be integrated without expanding the planar footprint, thereby maintaining a high screen-to-body ratio while achieving complete driving functionality.
Solution Approach 2:
The patent employs a nested structure where the carrier substrate containing driving circuits is integrated above the display substrate. The driving circuits are effectively 'nested' within the vertical space above the display region, allowing both display and driving functions to coexist in a compact form factor that maximizes screen-to-body ratio.
3Reliability
If signal lines are routed through the connection sub-region, then electrical connection is achieved, but vulnerability to electrostatic discharge increases
Solution Approach 1:
The patent incorporates electrostatic discharge protection units at the interface between the connection sub-region and the bezel region. These protection units are pre-positioned to counteract potential electrostatic discharge effects before they can damage the signal lines. The protection mechanism actively mitigates the harmful effect in advance, ensuring reliable electrical connection while protecting against electrostatic discharge.
Solution Approach 2:
The patent introduces electrostatic discharge protection units as intermediary elements between the signal lines and the external environment. These protection units act as mediators that can safely dissipate or block electrostatic discharge, protecting the vulnerable signal lines while maintaining electrical connection functionality.
Data Source
AI summary
A display substrate and a display apparatus are disclosed. The display substrate includes a display region and a peripheral region, the peripheral region includes a circuit region, and the display region includes a plurality of sub-pixels, a plurality of data lines extending along a first direction and a plurality of gate lines extending along a second direction crossing the first direction. The circuit region includes a plurality of driving unit groups. The circuit region includes a first sub-region and a second sub-region that are opposite to each other at two sides of the display region along the first direction, the first sub-region includes a plurality of multiplexing unit groups and the second sub-region includes a plurality of test unit groups.