Pixel Electrode Layout With Intermediate Stages to Prevent Dark Spots
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Solution Overview
Problem
Existing display devices face challenges in improving light output efficiency and reliability, particularly due to defects in light emitting elements that can result in dark spots.
Innovation Solution
A pixel design featuring a light emitting unit with three series stages, including first, second, and third light emitting elements connected in parallel, and a unique intermediate electrode configuration that enhances light distribution and reduces the impact of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting elements are connected in a simple series or parallel configuration, then the device complexity is reduced, but the reliability deteriorates due to defects causing dark spots
Solution Approach 1:
The light emitting unit is divided into three series stages (first, second, and third light emitting elements), each connected in parallel. This segmentation allows light to be emitted from multiple independent paths, so that if one element has a defect, the other stages can still emit light and prevent dark spots from appearing.
Solution Approach 2:
The patent introduces intermediate electrodes (first and second intermediate electrodes) that create an additional spatial dimension in the electrode configuration. This multi-dimensional arrangement allows for more complex connection patterns between pixel electrodes and light emitting elements, enabling the three-series-stage parallel connection structure that improves reliability.
2Illumination intensity
If a single light emitting element is used per pixel, then the device complexity is reduced, but the light output efficiency deteriorates
Solution Approach 1:
Multiple light emitting elements (first, second, and third light emitting elements) are merged into a single light emitting unit that operates together. The parallel connection of these elements within each series stage combines their light output, thereby improving overall light output efficiency while managing the structural complexity through systematic arrangement.
Solution Approach 2:
The patent uses intermediate electrodes to create a multi-dimensional connection structure that allows multiple light emitting elements to be arranged and connected in parallel within the pixel structure. This spatial arrangement enables increased light output without simply expanding the pixel area.
3Illumination intensity
If intermediate electrodes are positioned only in standard locations, then the manufacturing precision is simplified, but the light distribution deteriorates
Solution Approach 1:
The first intermediate electrode is positioned to surround at least one side of the first pixel electrode, creating a localized electrode arrangement that optimizes light distribution in specific regions. This non-uniform positioning allows for improved light extraction and distribution characteristics in areas where it is most needed.
Data Source
AI summary
A pixel includes an emission area and a non-emission area, a first pixel electrode, a first intermediate electrode, a second intermediate electrode, and a second pixel electrode spaced from each other, first light emitting elements including a first end electrically connected to the first pixel electrode and a second end electrically connected to the first intermediate electrode, second light emitting elements including a first end electrically connected to the first intermediate electrode and a second end electrically connected to the second intermediate electrode, and third light emitting elements including a first end electrically connected to the second intermediate electrode and a second end electrically connected to the second pixel electrode. The second intermediate electrode includes a first portion opposing the first intermediate electrode, a second portion between the first pixel electrode and the second pixel electrode, and a diagonal line portion between the first portion and the second portion.