Display Panel Signal Routing for IR Drop Mitigation
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Solution Overview
Problem
Micro LED splicing screens face issues with IR Drop (voltage drop) due to small and thin backplate circuits, leading to brightness uniformity deterioration across the display.
Innovation Solution
The display panel design includes multiple splicing light-emitting units with carrier substrates, where light-emitting elements are connected in parallel to first and second signal lines, which are then connected to first and second connection lines, allowing for sequential input of signals through auxiliary and bus lines, reducing resistance and improving brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a small and thin backplate circuit is used in Mini-LED splicing screen, then the display panel becomes thinner and more aesthetically pleasing, but IR Drop (voltage drop) occurs at the terminal, causing deterioration of brightness uniformity
Solution Approach 1:
The patent introduces signal lines that extend in a direction perpendicular to the arrangement of light-emitting elements (from bottom to top of the panel), rather than only along the row direction. This dimensional change in signal routing allows voltage to be supplied from multiple directions, reducing the impact of longitudinal resistance in the connection lines and mitigating IR Drop at terminal regions.
Solution Approach 2:
The patent introduces auxiliary signal lines as intermediary conductors that connect to the main signal lines. These auxiliary lines act as additional voltage supply pathways, mediating the voltage distribution to remote regions of the display panel and compensating for voltage drops in the main connection lines.
2Shape
If connection lines are made thinner to reduce panel thickness, then the display becomes more compact, but resistance increases leading to greater voltage drop
Solution Approach 1:
By routing signal lines in a perpendicular direction (bottom to top) rather than only horizontally along the light-emitting element rows, the patent creates multiple dimensional pathways for current flow. This reduces the effective path length and resistance in any single direction, allowing thinner connection lines to be used without excessive voltage drop.
Solution Approach 2:
The patent segments the voltage supply path by introducing multiple independent signal lines (first signal line, second signal line, auxiliary signal lines) that distribute voltage to different regions. This segmentation prevents any single connection line from bearing the full current load, reducing resistive heating and voltage drop in each individual line.
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 reduces the resistance in the connection lines, thereby mitigating the brightness differences and uniformity issues caused by signal voltage drops, enhancing the overall display performance.
Implementation Method 1
first terminals of all the light-emitting elements in a same row are electrically connected in parallel with the first connection lines, and wherein second terminals of all the light-emitting elements in a same row are electrically connected in parallel with the second connection lines
Data Source
AI summary
A display panel and a display device are provided. The display panel includes at least two splicing light-emitting units spliced with each other. A first signal line and a second signal line are respectively disposed on a first side surface of the carrier substrate and a second side surface opposite to the first side surface of the carrier substrate. The first signal line is electrically connected to the first connection line, and the second signal line is electrically connected to the second connection line. The present application adds input paths of the first input signal and the second input signal, and improves the problems of brightness difference and uniformity deterioration.