Display Panel Signal Transmission via Bridging and Segmentation
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Solution Overview
Problem
The existing display panel technology faces issues with signal transmission interruption due to disconnection of metal layers, particularly at the interface between silicon oxide insulating layers and metal layers, leading to peeling off and overetching during etching processes, which affects the yield and stability of the display panel.
Innovation Solution
A display panel design that includes a substrate with a first metal layer, an insulating layer with a protrusion covering the signal transmitting portion, a second metal layer with sub-portions connected to the bridging portion, and a conductive layer with a bridging portion electrically connected to the second sub-portions, allowing parallel connection and reducing resistance, thus ensuring continuous signal transmission even if the first sub-portion breaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate electrode insulating layer is disposed between a metal layer and a gate electrode for spacing insulation, then insulation is achieved, but the insulating layer forms a slope at the gate electrode position causing poor adhesion and peeling off
Solution Approach 1:
The second metal layer is divided into multiple segments (first metal layer, second metal layer, third metal layer) with insulating layers between them. This segmentation prevents peeling off by distributing the adhesion stress across multiple interfaces rather than concentrating it at a single slope-forming interface.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the first metal layer and the gate electrode. This intermediary layer prevents direct contact and eliminates the slope formation that causes poor adhesion, while still providing the necessary insulation function.
2Ease of manufacture
If etching is performed on the metal layer, then the metal layer can be patterned, but the etching solution penetrates and overetchs due to peeling off, causing disconnection
Solution Approach 1:
The patent applies a protective insulating layer coating on the metal layer before etching. This protective layer acts as a cushion that prevents the etching solution from penetrating through peeling-off regions and causing overetching, thereby preventing metal layer disconnection while still allowing proper patterning.
3Device complexity
If a single metal layer is used for signal transmission, then the structure is simple, but signal transmission is interrupted when the metal layer disconnects
Solution Approach 1:
The signal transmission path is segmented into multiple metal layers (first, second, and third metal layers) connected through insulating layers. This segmentation creates redundant transmission paths, so if one layer disconnects, signal transmission can continue through other layers, ensuring continuity while managing complexity through systematic layering.
Solution Approach 2:
The patent changes the structural parameter from a single metal layer to multiple metal layers with different configurations. This parameter change provides alternative signal transmission paths, ensuring that signal continuity is maintained even when individual layers experience disconnection.
Data Source
AI summary
The present application discloses a display panel and a display device. A first metal layer includes at least one first signal transmitting portion. An insulating layer includes a protrusion portion covering the first signal transmitting portion. A second metal layer includes at least one second signal transmitting portion. The second signal transmitting portion includes a first sub-portion, a second sub-portion, and a third sub-portion. The second sub-portion and the third sub-portion are respectively connected to two ends of the first sub-portion. A conductive layer includes a bridging portion. An orthographic projection of the second sub-portion on a substrate and an orthographic projection of the third sub-portion on the substrate both fall outside a coverage of an orthographic projection of the protrusion portion on the substrate. Two ends of the bridging portion are electrically connected to the second sub-portion and the third sub-portion respectively.