OLED Array Substrate Double-Layer Power Traces Brightness Uniformity
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Solution Overview
Problem
Existing organic light-emitting diode (OLED) display devices suffer from poor brightness uniformity and are prone to tensile breakage or cracks when bent multiple times, which affects their service life.
Innovation Solution
An array substrate with a double-layer power voltage trace structure and a double-layer data signal trace structure is implemented, where the second metal layer forms a mesh structure in the display area and the data signal lines are arranged under the organic filling layer in the bending area, using aluminum or aluminum alloy for the metal layers to reduce resistance and stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a double-layer power voltage trace structure is added to improve brightness uniformity, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent combines the power voltage trace structure with existing metal layers in the OLED display device. Specifically, it integrates a first power voltage trace in the first metal layer and a second power voltage trace in the second metal layer, merging the power delivery function with the existing multi-layer structure to reduce IR drop and improve brightness uniformity without adding completely separate trace structures
Solution Approach 2:
The patent transitions from a single-layer trace structure to a multi-layer trace structure by utilizing different metal layers (first metal layer and second metal layer) stacked in the vertical dimension. This dimensional change allows the power voltage traces to be distributed across multiple layers, reducing current density and IR drop while maintaining brightness uniformity
2Reliability
If the trace structure is made rigid to reduce resistance, then electrical conductivity is improved, but bending performance deteriorates
Solution Approach 1:
The patent employs flexible transparent conductive oxide (TCO) thin films as the first and second metal layers in the OLED display device. These TCO layers provide both electrical conductivity for power delivery and flexibility for bending applications, allowing the device to maintain good electrical connection while accommodating repeated bending without crack formation
Solution Approach 2:
The patent uses composite material structures where transparent conductive oxide layers are combined with organic light-emitting layers and other functional layers. This composite structure allows the trace system to exhibit both electrical conductivity properties and mechanical flexibility, resolving the contradiction between maintaining low resistance and achieving bendability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves brightness uniformity by reducing IR drop and enhances bending performance by minimizing stress on the trace structures, thereby extending the service life and reducing the risk of breakage.
Implementation Method 1
improving screen brightness uniformity by reducing the IR drop
Implementation Method 2
a material of the first metal layer, the second metal layer, or third metal layer comprises aluminum or an aluminum alloy
Data Source
AI summary
The present disclosure provides an array substrate, a display panel, and a manufacturing method of the array substrate. The array substrate includes a substrate layer, an active layer, a first insulating layer, a first metal layer, a second insulating layer, a second metal layer, an interlayer insulating layer, an organic filling layer, and a third metal layer being stacked together. The meshed second metal layer is disposed in the display area, and a double-layer power voltage trace structure in the display area is formed by connecting the first via holes and power voltage signal lines of the third metal layer.