Micro-LED Display Panel Voltage Distribution
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Solution Overview
Problem
Existing Micro-LED display panels experience significant brightness differences between the top and bottom middle regions due to voltage variations in the VDD and VSS power-supply traces, affecting display uniformity and user experience.
Innovation Solution
The implementation of a Micro-LED display panel design featuring first and second voltage-main-lines surrounding the display region, with input-units on opposite sides to supply voltages uniformly to pixel units, reducing voltage variations and enhancing brightness consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the VDD power-supply and VSS power-supply are coupled into the display panel at two sides of the top, then the trace length to top display region is short and voltage variation is small, but the trace length to bottom middle display region is long and voltage variation is large
Solution Approach 1:
The power supply coupling is segmented into four input-units distributed at four corners of the display panel, rather than concentrating both power supplies at one location. This segmentation allows each corner to receive power independently, reducing the maximum trace length and voltage variation to any point on the panel.
Solution Approach 2:
The power supply input locations are distributed across the panel in a two-dimensional arrangement (four corners) rather than concentrated in one dimension (top edge). This spatial distribution across multiple dimensions reduces the average distance and impedance to all display regions.
2Device complexity
If a single power supply coupling location is used, then the device complexity is low, but the brightness uniformity across the display panel deteriorates
Solution Approach 1:
By distributing four input-units at the four corners, the patent creates a more equipotential power distribution across the panel. Each corner acts as a power source, ensuring that no region is too far from a power supply, thereby maintaining more uniform voltage and brightness levels across the entire display area.
3Area of stationary object
If the trace length between power-supply and display region is long, then the voltage variation increases, but the area coverage is improved
Solution Approach 1:
The power delivery is segmented into multiple independent paths from four corner input-units, allowing the panel to serve a large display area while keeping each individual trace path relatively short. Each corner input-unit serves its adjacent regions, preventing any single long trace from causing excessive voltage variation.
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 design significantly reduces voltage differences across the display panel, improving brightness uniformity and user experience by ensuring consistent voltage delivery to all pixel units.
Implementation Method 1
The first voltage-main-line and the second voltage-main-line each surround the display region. A first voltage-access-end of each of the multiple pixel units is electrically coupled with the first voltage-main-line nearby. A second voltage-access-end of each of the multiple pixel units is electrically coupled with the second voltage-main-line nearby.
Implementation Method 2
since a VDD trace and a VSS trace each have impedance, if the drive current for the Micro-LED is relatively large, a large voltage variation occurs when the drive current flows through the VDD trace and the VSS trace
Data Source
AI summary
A Micro-LED display panel and a display device are provided. The display panel has a display region provided with pixel units, and includes a first voltage-main-line, a second voltage-main-line, a first input-unit, and a second input-unit. The first voltage-main-line and the second voltage-main-line each surround the display region. A first voltage-access-end of each pixel unit is electrically coupled with the first voltage-main-line nearby. A second voltage-access-end of each pixel unit is electrically coupled with the second voltage-main-line nearby. The first input-unit and the second input-unit are respectively located on a periphery of opposite sides of the display region in a first direction. The first input-unit and the second input-unit each are electrically coupled with the first voltage-main-line nearby, to supply a first voltage to the first voltage-main-line. The first input-unit is electrically coupled with the second voltage-main-line nearby, to supply a second voltage to the second voltage-main-line.