Bridge Pattern Layout for Independent Sub-Pixel Driving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display technologies face challenges in independently driving sub-pixels with subminiature light emitting elements, particularly in achieving efficient alignment and electrical disconnection of connection lines, which affects the overall performance and reliability of active matrix-type display devices.
Innovation Solution
The proposed solution involves a display device structure with a substrate having a display area and non-display area, featuring pixels with sub-pixels that include a pixel circuit layer, a display element layer, and specific electrode and connection line configurations. This includes forming a bridge pattern and capping layers to ensure electrical disconnection of connection lines from electrodes, allowing for independent operation of each sub-pixel by aligning light emitting elements between electrodes using an electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection lines are extended in the peripheral area to connect electrodes, then electrical connection is achieved, but electrical shorts between adjacent pixels may occur
Solution Approach 1:
The connection line structure is segmented into multiple layers (first connection line on first substrate layer, second connection line on second substrate layer). This segmentation allows electrical connection to be achieved while preventing electrical shorts between adjacent pixels through the layered isolation structure.
Solution Approach 2:
The connection lines are arranged in different spatial dimensions (layers) rather than only in the planar peripheral area. The first connection line is disposed on a first substrate layer and the second connection line on a second substrate layer, utilizing the vertical dimension to achieve both connection and isolation.
2Productivity
If sub-pixels are made small to increase pixel density, then display resolution is improved, but independent driving of sub-pixels becomes difficult
Solution Approach 1:
Each sub-pixel is provided with separate first and second connection lines that are independently controllable through different electrode voltages. This segmentation enables independent driving of each sub-pixel even at small sizes, maintaining ease of operation while increasing pixel density.
Solution Approach 2:
The bridge pattern acts as an intermediary structure that enables independent control of connection lines. By applying different voltages to first and second electrodes, the bridge pattern mediates the electrical connection to achieve independent sub-pixel driving.
3Manufacturing precision
If bridge pattern is used to align light emitting elements, then alignment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The bridge pattern serves multiple functions: it aligns light emitting elements during manufacturing, provides electrical connection pathways, and enables independent sub-pixel control. This multi-functionality reduces the need for separate alignment structures, thereby reducing overall manufacturing complexity while maintaining high alignment precision.
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 enables the independent operation of each sub-pixel, enhancing the reliability and performance of active matrix-type display devices by ensuring efficient light emission and minimizing electrical shorts, thereby improving the display's overall efficiency and durability.
Implementation Method 1
aligning light emitting elements between electrodes using an electric field
Data Source
AI summary
A display device may include a substrate including a display area and a non-display area; and pixels provided in the display area, each of the plurality of pixels comprising sub-pixels. Each of the plurality of sub-pixels may include a pixel circuit layer including at least one transistor, and a display element layer including an emission area and a peripheral area, a first electrode provided in the emission area, a second electrode spaced apart from the first electrode, at least one light emitting element provided in the emission area, and including a first end electrically connected to the first electrode, and a second end electrically connected to the second electrode; a first connection line provided in the peripheral area; and a bridge pattern provided in the peripheral area, and diverging from the first connection line. The bridge pattern may be electrically disconnected from each of the first and second electrodes.