Display Substrate Auxiliary Metal Lines IR Drop
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Solution Overview
Problem
Display devices experience non-uniform light emission due to Internal Resistance Drop (IR Drop) in power lines, leading to varying high-level voltage signals received by pixel units, affecting display quality.
Innovation Solution
A display substrate design featuring a base substrate with a first pattern layer including auxiliary metal lines and a second pattern layer with power lines, where the auxiliary metal lines are electrically coupled to the power lines through via holes, forming storage capacitors to reduce resistance and ensure uniform signal transmission across pixel units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If power lines are used to supply high-level voltage signals to pixel units, then power transmission is achieved, but internal resistance causes voltage drop leading to non-uniform light emission
Solution Approach 1:
The power line is segmented into multiple sections by introducing auxiliary metal lines that are electrically coupled to the power line through via holes. Each segment between via holes acts as an independent low-resistance path, reducing the cumulative resistance effect and voltage drop across the entire power line, thereby improving voltage signal stability and light emission uniformity.
Solution Approach 2:
The auxiliary metal lines are merged with the power line structure through electrical coupling via via holes. This combining creates a composite power distribution network that leverages the low resistance of metal lines while maintaining the functional integrity of the original power line, effectively reducing internal resistance and improving voltage stability.
2Reliability
If auxiliary metal lines are added to reduce resistance, then voltage drop is reduced, but device structure becomes more complex
Solution Approach 1:
The auxiliary metal lines serve multiple functions: they act as additional power transmission paths to reduce resistance, serve as electrodes for storage capacitors to maintain voltage stability, and provide structural support. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving voltage signal stability.
Solution Approach 2:
The auxiliary metal lines are nested within the existing layered structure of the display device, integrating into the pattern layers and utilizing the same vertical space. The via holes nest through the interlayer insulating layer to connect the auxiliary lines with the power line, minimizing structural disruption and keeping the device complexity manageable.
3Reliability
If auxiliary metal lines overlap with second electrodes to form storage capacitors, then voltage stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The auxiliary metal line is designed to overlap with the second electrode to form a storage capacitor, creating an equipotential region that stabilizes the voltage signal. This overlapping structure ensures that both elements are at the same potential, reducing voltage fluctuations and improving signal stability while the via hole connection provides a direct low-resistance path.
Solution Approach 2:
The auxiliary metal line has varying width along its length, with the width being larger at the overlapping portion with the second electrode and smaller at other portions. This local quality variation optimizes the capacitor formation at the overlap region while minimizing material usage and interference elsewhere, balancing manufacturing precision requirements with performance benefits.
Data Source
AI summary
The present disclosure provides a display substrate and a method for manufacturing the same, and a display device. The display substrate includes: a base substrate; a first pattern layer, a second pattern layer and a third pattern layer on the base substrate, the third pattern layer is arranged on the base substrate, the first pattern layer is arranged on the third pattern layer, and the second pattern layer is arranged on the first pattern layer, the first pattern layer comprises at least one auxiliary metal line, the second pattern layer comprises at least one power line, and the third pattern layer comprises multiple rows and columns of second electrodes arranged in an array.