OLED Opposite Electrode Segmentation for IR Drop Reduction
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Solution Overview
Problem
In organic light-emitting display devices, the configuration of a single body opposite electrode covering multiple pixels can lead to brightness deviations due to IR drops, and existing designs face challenges in efficient electric connection to power lines.
Innovation Solution
The organic light-emitting display device features pixel electrodes and opposite electrodes patterned on a per-pixel basis, with connection electrodes connecting the opposite electrodes to a power line, reducing IR drops and facilitating easy electrical connection, thereby maintaining uniform brightness across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single body opposite electrode covering multiple pixels is used, then the device structure is simplified, but brightness deviations occur due to IR drops
Solution Approach 1:
The opposite electrode is divided into multiple separate opposite electrodes, each corresponding to a specific pixel region. This segmentation allows each electrode to be independently connected to the power line, eliminating IR drops across large electrode areas and ensuring uniform brightness across all pixels.
2Illumination intensity
If opposite electrodes are patterned on a per-pixel basis, then brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
While opposite electrodes are patterned per pixel, connection electrodes are introduced to merge multiple opposite electrodes electrically to the power line. This combining approach maintains the brightness uniformity benefits of per-pixel patterning while simplifying the overall electrical connection structure.
3Ease of manufacture
If connection electrodes are added to connect opposite electrodes to power lines, then electrical connection efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The connection electrodes serve multiple functions: they connect opposite electrodes to the power line, provide electrical pathways in the non-pixel regions, and can be integrated with other conductive structures in the device. This multi-functionality reduces the need for separate dedicated connection structures.
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 suppresses brightness deviations by minimizing IR drops and allows for efficient electrical connection to power lines, ensuring consistent pixel performance.
Implementation Method 1
An organic light-emitting display device is a display device in which each of pixels includes an organic light-emitting diode (OLED). The OLED includes a pixel electrode, an opposite electrode facing the pixel electrode, and an emission layer between the pixel electrode and the opposite electrode.
Data Source
AI summary
An organic light-emitting display device includes a substrate including a display area and a peripheral area surrounding the display area. The display area includes a plurality of pixel regions including a plurality of pixels including pixel electrodes and non-pixel regions between the pixel regions. The pixel electrodes are spaced apart from each other, with a pixel-defining layer above the plurality of pixel electrodes and exposing the plurality of pixel electrodes. A plurality of intermediate layers respectively above the plurality of pixel electrodes include an emission layer. A plurality of opposite electrodes respectively face the plurality of pixel electrodes and are spaced apart from each other. A plurality of connection electrodes that connect the plurality of opposite electrodes are in the non-pixel regions. A power line electrically connected to at least one of the plurality of connection electrodes is in the peripheral area.