Driving Backplane Signal Line Pair Layout for Voltage Uniformity
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Solution Overview
Problem
In medium- and large-sized display apparatuses, signal lines become longer, leading to increased resistance and signal attenuation, resulting in uneven voltage transmission and color issues during image display, particularly in active matrix organic light-emitting diode (AMOLED) displays.
Innovation Solution
A driving backplane structure is designed with signal line pairs where the first and second signal lines are parallel and overlapping, with via holes and conductive patterns to reduce surface resistance and voltage attenuation, and a manufacturing method involving sequential formation of conductive and insulating layers to achieve efficient signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If signal lines are made longer to cover medium- and large-sized display areas, then the display area is increased, but resistance and signal attenuation increase leading to uneven voltage transmission
Solution Approach 1:
The signal transmission path is segmented into multiple parallel signal lines (first signal line and second signal line) that extend in the same direction and overlap in projection. This segmentation divides the current flow into multiple paths, reducing the resistance and signal attenuation in each individual path while maintaining coverage of the large display area.
Solution Approach 2:
Multiple signal lines are merged in parallel to form a signal line pair, where the first and second signal lines are coupled together. This merging combines the conductive capacity of multiple lines, effectively reducing the total resistance and improving signal transmission reliability across the display panel.
2Reliability
If signal line pairs with overlapping projections are used, then surface resistance is reduced and signal attenuation is minimized, but the structural complexity of the backplane increases
Solution Approach 1:
The signal lines are arranged in the same extending direction with overlapping projections, utilizing the vertical dimension (depth) of the backplane structure. This dimensional arrangement allows multiple signal lines to share the same horizontal space, reducing the overall footprint while maintaining parallel current paths for reduced resistance.
Solution Approach 2:
The signal line pair structure serves multiple functions: it reduces resistance through parallel paths, maintains signal integrity through coupled lines, and optimizes space utilization through overlapping projections. This multi-functional design achieves improved signal transmission without proportionally increasing structural complexity.
Data Source
AI summary
A driving backplane includes: a base; a first conductive layer disposed on the base, the first conductive layer including at least one first signal line; a first insulating layer disposed on a side of the first conductive layer away from the base; a second conductive layer disposed on a side of the first insulating layer away from the first conductive layer, the second conductive layer including at least one second signal line. Each first signal line and a second signal line constitute a signal line pair. In the signal line pair, extending directions of the first signal line and the second signal line are the same, an orthogonal projection of the first signal line on the base and an orthogonal projection of the second signal line on the base have a first overlapping region, and the second signal line is coupled to the first signal line.