Power Line Wiring Structure for AMOLED Brightness Uniformity
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Solution Overview
Problem
Conventional power line wiring structures in AMOLED display panels result in significant voltage differences between high-potential and low-potential power lines, leading to uneven brightness and increased current in driver TFTs, which affects brightness uniformity and increases production costs.
Innovation Solution
A power line wiring structure where the entry points of high-potential and low-potential power lines are separated by an appropriate spacing, with optimized wiring arrangements and line widths to reduce voltage drops and prevent excessive current, improving brightness uniformity and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If high-potential power lines (VDD) and low-potential power lines (VSS) are entered into display area from the same position, then wiring complexity is reduced, but voltage difference between VDD and VSS becomes very large causing excessive current and poor brightness uniformity
Solution Approach 1:
The power line entry positions are segmented into separate locations: high-potential power lines enter from a first position while low-potential power lines enter from a second position. This spatial segmentation reduces the voltage difference between VDD and VSS, thereby reducing operating current and improving brightness uniformity across the display panel.
2Manufacturing precision
If double-metal layered source/drain layer or external compensation method is used to reduce IR drop, then brightness uniformity is improved, but product cost increases and production yield decreases
Solution Approach 1:
The patent extracts the power line entry points from their conventional combined position and relocates them to separate positions. This extraction eliminates the need for complex double-metal layered structures or external compensation methods, thereby maintaining brightness uniformity while reducing manufacturing complexity and cost.
3Manufacturing precision
If power lines are arranged with optimized spacing and line width, then voltage drop is reduced and brightness uniformity is improved, but wiring structure becomes more complex
Solution Approach 1:
The patent applies local quality optimization by specifying particular spacing distances between separated power line entry positions and adjusting line widths in specific regions. This localized optimization reduces voltage drop and improves brightness uniformity without requiring complex wiring structures throughout the entire display panel.
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
The solution effectively improves brightness uniformity by minimizing voltage differences and reducing power consumption, while maintaining cost-effectiveness and production yield.
Implementation Method 1
An IR drop is the most important factor affecting the brightness uniformity of the display panel
Data Source
AI summary
A power line wiring structure and a flexible display panel having the same are provided. The power line wiring structure includes a first power line and a second power line. The first power line includes a first lateral section, a first connection section, and a second lateral section. The first connection section includes at least two first sub-connection lines. The second power line includes a retracted section, a second connection section, and a peripheral section. The second connection section includes at least two second sub-connection lines, and the at least two second sub-connection lines are respectively disposed outside the at least two first sub-connection lines. A width of the second sub-connection line is less than a width of the first sub-connection line.