Display Signal Line Bridge Layout for Lower RC Load
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Solution Overview
Problem
As display panels increase in resolution and reduce the number of masks used, the resistance-capacitor load (RC Load) in the display panel increases, leading to a degradation of image quality due to reduced charge rates, particularly as the parasitic capacitance between intersecting signal lines increases.
Innovation Solution
Incorporating a bridge portion on the second signal line at the intersection area with the first signal line, connected through contact holes on the second insulating film, to reduce parasitic capacitance and RC load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of masks is reduced and resolution is increased, then manufacturing complexity is reduced and display quality is improved, but RC load increases and charge rate degrades
Solution Approach 1:
The second signal line is divided into multiple segments (first signal line segment, second signal line segment, third signal line segment) separated by bridge portions. This segmentation reduces the overlapping area between intersecting signal lines, thereby reducing parasitic capacitance and RC load while maintaining manufacturing simplicity
Solution Approach 2:
Bridge portions are introduced as intermediary elements between the first and second signal lines. These bridge portions act as mediators that connect the segmented signal lines while minimizing direct overlap, thus reducing parasitic capacitance without adding significant manufacturing complexity
2Reliability
If the overlap area between intersecting signal lines is increased, then signal connection is improved, but parasitic capacitance increases and RC load increases
Solution Approach 1:
The second signal line is segmented into multiple parts with bridge portions connecting them. This segmentation策略ically reduces the continuous overlap area between the first and second signal lines, thereby reducing parasitic capacitance while maintaining signal connection through the bridge portions
Solution Approach 2:
The signal line connection is achieved not only in the planar dimension but also by utilizing the vertical dimension with bridge portions connecting different levels. This dimensional approach reduces planar overlap area and parasitic capacitance while maintaining electrical connection
Data Source
AI summary
A display panel in which a bridge portion is included in any one of two signal lines at its intersection area, and a display apparatus using the same. The display panel comprises a substrate, a first signal line along a first direction, a first insulating film covering the first signal line, a second signal line along a second direction different from the first direction, a second insulating film covering the first insulating film, and a first pixel electrode on the second insulating film, wherein the second signal line includes an extension line, a connection line, an overlapping line, and a bridge portion connected to the extension line, the connection line, and the overlapping line through contact holes disposed on the second insulating film.