Display Substrate Bezel Reduction via Stacked Circuit Layout
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Solution Overview
Problem
In display technology, particularly for wearable devices, there is a challenge in achieving a high screen-to-body ratio due to the presence of driving circuits outside the display region, which limits the bezel size and affects the visual effect and portability of devices.
Innovation Solution
A display substrate design that includes a display region surrounded by a peripheral region with specific arrangements of multiplexing, testing, and driving unit groups, compensation capacitor units, and signal lines, optimizing the layout to reduce the bezel size and increase the screen-to-body ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If driving circuits are provided directly outside the display region, then the display device can be manufactured with simpler structure, but the screen-to-body ratio is reduced due to increased bezel size
Solution Approach 1:
The patent applies fan-out wiring technology to route signal lines from the display region through underlying layers to the peripheral region, effectively utilizing the third dimension (vertical stacking) to reduce the horizontal space occupied by bezel circuits. This allows the display region to extend closer to the edges while maintaining circuit functionality.
Solution Approach 2:
The patent implements a multi-layer substrate structure where circuit elements are nested within stacked substrates. The first substrate contains the display region, while the second substrate contains the peripheral region with driving circuits. Signal lines pass through the first substrate to connect to the second substrate, creating a nested configuration that maximizes screen-to-body ratio.
2Area of stationary object
If the display region is expanded to increase screen-to-body ratio, then the visual effect and portability are improved, but the layout complexity of circuits and signal lines increases
Solution Approach 1:
The patent divides the display device into distinct stacked substrates: a first substrate containing the display region and a second substrate containing the peripheral region. This segmentation allows independent optimization of each substrate's layout, reducing the complexity of routing circuits and signal lines while achieving high screen-to-body ratio.
Solution Approach 2:
The patent introduces fan-out wiring as an intermediary mechanism that connects signal lines from the display region to the peripheral region through the stacked substrate structure. This intermediary approach simplifies the layout by providing dedicated routing paths rather than requiring complex planar connections.
Data Source
AI summary
A display substrate of the present disclosure includes a display region including sub-pixels, data lines, and gate lines; and a circuit region including a first sub-region and a second sub-region opposite to each other at two sides of the display region along a first direction. The first sub-region is provided with a plurality of multiplexing unit groups, each of which includes at least one multiplexing unit. The second sub-region is provided with a plurality of testing unit groups, each of which includes at least one testing unit. The circuit region is further provided with a plurality of driving unit groups, each of which includes at least one driving unit. The driving unit groups and the multiplexing unit groups are alternately arranged along an extending direction of the first sub-region in the first sub-region.