Display Panel Bridge Structure for Lower Parasitic Capacitance
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Solution Overview
Problem
The increase in resistance-capacitor load (RC Load) in display panels due to increased parasitic capacitance between intersecting signal lines degrades image quality, particularly in high-resolution displays with reduced mask usage.
Innovation Solution
Incorporating a bridge portion in one of the signal lines at their intersection area, connected through contact holes in the 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 in high-resolution display panels, then manufacturing complexity is decreased, but parasitic capacitance between intersecting signal lines increases, leading to increased RC load and degraded image quality
Solution Approach 1:
The patent introduces an intermediary structure (the bridge portion connected to the first signal line through contact holes) to mediate the interaction between intersecting signal lines. This intermediary reduces the direct overlap area between the second signal line and the first signal line, thereby decreasing parasitic capacitance while maintaining signal transmission functionality.
Solution Approach 2:
The patent segments the signal line structure by dividing the second signal line into multiple segments (extension line, connection line, overlapping line, and bridge portion) that are connected through contact holes. This segmentation reduces the continuous overlap area between intersecting lines, thereby reducing parasitic capacitance while maintaining electrical connectivity.
2Reliability
If the overlap area between two intersecting signal lines is increased, then signal transmission stability is improved, but parasitic capacitance between the lines increases, thereby increasing RC load and degrading charging rate
Solution Approach 1:
The bridge portion acts as an intermediary that provides an alternative path for signal transmission, reducing the direct capacitive coupling between intersecting lines. This allows the signal to be transmitted stably while reducing the RC load that would otherwise slow down the charging rate.
Solution Approach 2:
The patent introduces a vertical dimension by using contact holes to connect the bridge portion to the first signal line from below (through the insulating film). This three-dimensional arrangement reduces the horizontal overlap area between signal lines, thereby reducing parasitic capacitance while maintaining signal transmission stability through the vertical connection path.
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.