Auxiliary Electrode Parallel Conduction for Display IR Drop
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Solution Overview
Problem
Conventional display devices experience IR Drop due to varying distances between light-emitting elements and driving chips, leading to uneven signal transmission and issues like bright or color mura.
Innovation Solution
Incorporating an auxiliary electrode that overlaps the active region and is electrically connected to the second electrode of light-emitting elements, reducing excessive resistance and improving signal transmission by connecting in parallel with the second electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light-emitting elements are positioned at different distances from the driving chip, then the display device can achieve a larger active region, but IR drop occurs due to longer voltage signal transmission paths causing uneven signal transmission
Solution Approach 1:
The patent divides the voltage signal transmission path into two separate parallel paths: one through the second electrode and another through the auxiliary electrode. This segmentation allows the total resistance to be reduced by providing multiple conduction channels, thereby mitigating IR drop effects across the large active region while maintaining signal transmission uniformity.
Solution Approach 2:
The auxiliary electrode acts as an intermediary component that provides an additional voltage signal transmission path between the driving chip and the light-emitting elements. By introducing this intermediate conductive structure, the patent reduces the overall resistance in the voltage signal path and ensures uniform signal distribution across elements at different distances from the driving chip.
2Device complexity
If the second electrode has high resistance to reduce manufacturing complexity, then the device structure is simpler, but IR drop increases causing bright mura or color mura
Solution Approach 1:
The patent merges the second electrode and auxiliary electrode into a combined parallel conduction system. Both electrodes work simultaneously to transmit voltage signals to the light-emitting elements, effectively combining their conductive capabilities to reduce total resistance and prevent IR drop-related defects while maintaining reasonable manufacturing complexity.
Solution Approach 2:
The patent changes the electrical parameter configuration by introducing an auxiliary electrode that provides an additional conduction path. This parameter change reduces the effective resistance in the voltage signal transmission path, thereby reducing IR drop and preventing display defects without significantly increasing structural complexity.
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 minimizes IR Drop, preventing bright or color mura by ensuring more uniform voltage signal transmission across the display device, and can also function as a heat dissipation layer to cool active elements.
Implementation Method 1
the auxiliary electrode improves the problem of IR Drop of the light-emitting element due to the excessive resistance of the second electrode
Implementation Method 2
can also function as a heat dissipation layer to cool active elements
Data Source
AI summary
A display device includes a substrate, an auxiliary electrode, a buffer layer, a plurality of active elements, and a plurality of light-emitting elements. The auxiliary electrode is disposed on the substrate and overlapped with an active region. The buffer layer is disposed on the auxiliary electrode. The plurality of active elements are disposed on the buffer layer and disposed in the active region. The plurality of light-emitting elements are electrically connected with the active elements, respectively. Each of the light-emitting elements includes a first electrode, a second electrode, and a light-emitting layer disposed between the first electrode and the second electrode. Each of the second electrodes is electrically connected with the auxiliary electrode.