Display Device Power Wire Segmentation for Voltage Drop Reduction
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Solution Overview
Problem
In display devices, the power voltage for driving pixels experiences a voltage drop due to resistance in the power wire, leading to luminance deviations and reduced display quality, and increasing the voltage level to compensate for this results in increased power consumption.
Innovation Solution
The display device incorporates a configuration with first and second common power wires and path wires that overlap each other, connected to connecting pads on the substrate, to reduce voltage drop and improve luminance uniformity, while maintaining low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the voltage level of the power voltage is increased to compensate for voltage drop, then the luminance deviation is reduced, but the power consumption increases
Solution Approach 1:
The power wire is divided into multiple segments (first power wire, second power wire, third power wire) arranged in parallel. Each segment carries a portion of the total current, reducing the current density and voltage drop in each individual wire while maintaining the required power delivery to pixels at different positions
Solution Approach 2:
Multiple power wires are combined to form a distributed power delivery network. The first, second, and third power wires work together to provide redundant power paths, ensuring that pixels at various positions receive sufficient voltage without requiring excessive voltage at the source
2Device complexity
If a single power wire is used to supply power to all pixels, then the device complexity is reduced, but the voltage drop increases
Solution Approach 1:
The single power wire is segmented into multiple parallel power wires (first, second, and third power wires) that extend across different regions of the display. This segmentation reduces the effective length and resistance of each individual power wire, thereby reducing voltage drop without significantly increasing overall system complexity
Solution Approach 2:
The power delivery system transitions from a one-dimensional single wire to a two-dimensional parallel wire structure. The first, second, and third power wires are arranged in parallel and may overlap in certain regions, creating a distributed network that reduces voltage drop through multiple parallel paths
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 effectively reduces voltage drop across the display area, enhancing display quality by maintaining consistent luminance across pixels and minimizing power consumption.
Implementation Method 1
a first path wire configured to include one end connected to a second connecting pad of the plurality of connecting pads and the other end connected to the second common power wire and to be positioned on the encapsulation layer
Data Source
AI summary
A display device includes: a first substrate; a display area with a plurality of pixels on the first substrate; a pad portion adjacent to a first side of the display area and including a plurality of connecting pads positioned on the first substrate; a first common power wire positioned between the display area and the pad portion and connected to a first connecting pad as at least one of the plurality of connecting pads to receive a power voltage; a second common power wire positioned adjacent to a second side of the display area facing the first side; an encapsulation layer positioned on the display area to protect the plurality of pixels; and a first path wire including one end connected to a second connecting pad of the plurality of connecting pads and the other end connected to the second common power wire and positioned on the encapsulation layer.