Multi-Stage Pixel Electrode Layout for Lower Display Driving Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in efficiently utilizing subminiature light emitting elements and reducing driving current and power consumption, particularly in large display panels.
Innovation Solution
A display device design featuring a pixel structure with alternating stages of electrodes and contact electrodes, connected by connection electrodes, forming a serial/parallel combination of light emitting elements to reduce driving current and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are connected in parallel between electrodes, then the brightness and light output are improved, but the driving current increases and power consumption efficiency deteriorates
Solution Approach 1:
The pixel is divided into multiple sub-pixels, each containing light emitting elements connected in series. This segmentation allows the total light output to be distributed across multiple series-connected elements, reducing the driving current required compared to a single parallel-connected element while maintaining overall brightness.
Solution Approach 2:
The patent transitions from a single-plane parallel connection to a multi-stage three-dimensional arrangement where light emitting elements are connected in series across multiple stages (first stage, second stage, etc.) with connection electrodes linking them. This dimensional change enables series connection while maintaining compact pixel structure.
2Productivity
If more light emitting elements are used in each pixel, then the brightness and efficiency are improved, but the driving current increases
Solution Approach 1:
Multiple light emitting elements are divided into different stages (first stage, second stage, third stage, etc.), with each stage containing a subset of elements connected in parallel. These stages are then connected in series, allowing more total elements to be used while reducing the current through each individual element.
Solution Approach 2:
The patent uses multi-stage vertical stacking where light emitting elements are arranged in series across multiple stages along the vertical dimension, with connection electrodes bridging between stages. This enables increased element count without proportionally increasing driving current.
3Use of energy by moving object
If connection electrodes are added to connect stages in series, then the driving current is reduced and power efficiency is improved, but the device complexity increases
Solution Approach 1:
The connection electrodes are integrated with the existing electrode structure of each stage. The second electrode of one stage serves as the connection point to the first electrode of the next stage, merging the functional elements rather than adding separate connection components.
Solution Approach 2:
The electrodes serve multiple functions: they act as both the electrical contacts for the light emitting elements within each stage and as the connection electrodes linking adjacent stages together. This multi-functionality reduces the need for additional dedicated connection structures.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A display device according to an embodiment of the present invention includes a pixel disposed in a display area. The pixel include: first and second sub-areas; first and second electrodes of a first stage disposed in the first sub-area; first light emitting elements arranged between the first and second electrodes; first and second contact electrodes of the first stage configured to electrically connect the first light emitting elements between the first and second electrodes; first and second electrodes of a second stage disposed in the second sub-area; second light emitting elements arranged between the first and second electrodes of the second stage; first and second contact electrodes of the second stage configured to electrically connect the second light emitting elements between the first and second electrodes of the second stage; and a connection electrode configured to connect the second contact electrode of the first stage with the first contact electrode of the second stage.