Pixel Sub-Area Electrode Layout for Lower-Current LED Displays
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Solution Overview
Problem
Current display devices face challenges in efficiently utilizing subminiature light emitting elements and managing driving current, leading to increased power consumption and potential defects such as short-circuits in the light emitting elements.
Innovation Solution
A display device design featuring a pixel structure with multiple sub-areas and contact electrodes that electrically connect light emitting elements in a serial or parallel combination, allowing for efficient alignment and connection of light emitting elements, reducing driving current and minimizing defects by enabling the flow of current through valid light sources even if some elements are defective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting elements are arranged in parallel between electrodes, then the device can be manufactured with simpler structure, but the driving current increases leading to higher power consumption
Solution Approach 1:
The pixel is divided into multiple sub-areas (first sub-area, second sub-area, etc.) with each sub-area containing light emitting elements connected in series. This segmentation allows the total light emitting elements to be distributed across multiple series chains, reducing the current requirement while maintaining manufacturing feasibility through modular electrode structures (first electrodes, second electrodes, connection electrodes)
Solution Approach 2:
The patent transitions from a single-plane parallel arrangement to a multi-dimensional electrode configuration spanning multiple sub-areas. Connection electrodes extend in boundary areas between sub-areas in directions intersecting with the main electrode directions, creating a three-dimensional electrical connection network that enables series-parallel hybrid configuration
2Reliability
If more light emitting elements are used to improve display quality, then the display performance improves, but the risk of defects such as short-circuits increases
Solution Approach 1:
By dividing the pixel into multiple sub-areas with series-connected light emitting elements in each sub-area, the system can tolerate defects in individual elements better. If one element fails in a series chain, the other chains remain functional, maintaining overall display quality while using a larger total number of light emitting elements
Solution Approach 2:
The patent changes the electrical connection parameter from pure parallel to series-parallel hybrid, which fundamentally alters the defect propagation characteristics. In series connections within sub-areas, a defect affects only that specific sub-area's light emission, whereas in pure parallel configurations, defects can cause broader failures
3Use of energy by moving object
If light emitting elements are arranged in series to reduce driving current, then power consumption decreases, but the device structure becomes more complex
Solution Approach 1:
The pixel is segmented into multiple sub-areas, each functioning as an independent series chain. This segmentation enables series connection for current reduction while keeping each sub-area's internal structure simple and regular, with electrodes and contact electrodes following predictable patterns that simplify manufacturing despite the overall multi-sub-area complexity
Solution Approach 2:
The electrode structures serve multiple functions: first electrodes and second electrodes define sub-areas, contact electrodes provide electrical connections, and connection electrodes link sub-areas in series. This multi-functionality reduces the need for additional specialized components, managing structural complexity while achieving series connection for lower power consumption
Data Source
AI summary
A display device includes a pixel disposed in a display area. The pixel includes first and second sub-areas; first and second electrodes of a first stage disposed in the first sub-area; first light emitting elements disposed between the first and second electrodes; first and second contact electrodes of the first stage 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 disposed between the first and second electrodes of the second stage; first and second contact electrodes of the second stage to electrically connect the second light emitting elements between the first and second electrodes of the second stage; and a connection electrode to electrically connect the second contact electrode of the first stage with the first contact electrode of the second stage.