Display Panel Fan-Out Structure for Narrow-Bezel Integration
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Solution Overview
Problem
Existing display panel designs with integrated gate driving circuits in the peripheral region occupy a large area, hindering the achievement of a narrow bezel and full screen display.
Innovation Solution
The display panel integrates gate driving circuits directly in the display region, utilizing a fan-out region and bonding region to reduce the width of the peripheral region, with optimized wiring of control and data lines to minimize signal line length and prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gate driving circuits are integrated in the peripheral region, then the display panel can be manufactured with conventional structures, but the peripheral region occupies a large area resulting in wide bezel
Solution Approach 1:
The gate driving circuits are moved from the traditional peripheral region to the display region, utilizing the vertical dimension (through multiple conductive layers) rather than horizontal expansion. Control signal lines extend from the display region to the fan-out region, and data lines are routed through the fan-out region to the bonding region, effectively using the third dimension (depth/layers) to accommodate circuitry that would otherwise require peripheral space.
Solution Approach 2:
The display panel is divided into distinct functional regions: display region, fan-out region, and bonding region. The fan-out region serves as an intermediate zone that separates the display region from the bonding region, allowing control signal lines and data lines to be routed independently through different paths (direct connection vs. through fan-out region), thereby reducing the overall peripheral region area required.
2Reliability
If control signal lines and data lines are routed through the fan-out region, then signal line length is reduced and interference is minimized, but the wiring structure becomes more complex
Solution Approach 1:
The wiring structure is segmented into two independent paths: control signal lines extend directly from the display region to the fan-out region, while data lines extend from the display region through the fan-out region to the bonding region. This segmentation allows each line type to be optimized for its specific function, with control lines being shorter and data lines providing necessary routing flexibility, thereby reducing interference and improving signal yield.
Solution Approach 2:
The fan-out region acts as an intermediary zone that facilitates the routing of data lines from the display region to the bonding region without requiring control signal lines to traverse the entire path. This intermediary structure allows data lines to be extended through the fan-out region while control lines stop at the fan-out region boundary, minimizing line length and interference for control signals.
Data Source
AI summary
A display panel has a display region, a fan-out region located on a side of the display region, and a bonding region located on a side of the fan-out region away from the display region. The display panel includes a gate driving circuit disposed in the display region, a plurality of data lines and a plurality of control signal lines that all extends from the display region to the fan-out region, and a plurality of data fan-out leads and a plurality of first fan-out leads that are all disposed in the fan-out region. Each data line is electrically connected to a data fan-out lead. The data fan-out leads are gathered to the bonding region. The control signal lines are electrically connected to the gate driving circuit. Each control signal line is electrically connected to a first fan-out lead. The first fan-out leads are gathered to the bonding region.