Stacked Pixel Electrode Layout for Light Alignment and Shielding
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Solution Overview
Problem
Existing display devices face challenges in improving light output efficiency and reliability due to defects between adjacent electrodes, which affect the alignment and performance of light emitting elements.
Innovation Solution
A pixel design featuring a pixel circuit layer with a first electrode and a second electrode on different layers, separated electrically, with light emitting elements overlapping both electrodes, and a third electrode on the same layer as the second electrode, enhancing alignment and shielding against electric fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first electrode and the second electrode are disposed on different layers and electrically separated, then the reliability of light emitting elements is improved by preventing short defects, but the device complexity increases due to multiple layers and electrodes
Solution Approach 1:
The patent transitions from a planar electrode arrangement to a three-dimensional stacked configuration where the first electrode is disposed on the substrate and the second electrode is disposed on a different layer above it. This vertical separation in the third dimension prevents short defects between electrodes while maintaining electrical connection through conductive layers, thus improving reliability without requiring excessive horizontal spacing.
Solution Approach 2:
The electrode system is segmented into multiple functional components: the first electrode on the substrate, the second electrode on the upper layer, and intermediate conductive layers. This segmentation allows each electrode to perform its specific function independently while preventing short circuits through the insulating barrier between layers.
2Productivity
If the light emitting elements overlap the first and second electrodes, then the light output efficiency is improved, but the manufacturing precision requirements increase due to alignment constraints
Solution Approach 1:
By stacking electrodes vertically on different layers, the patent creates overlapping regions in the vertical dimension that project onto the same horizontal area. This allows light emitting elements to overlap multiple electrodes simultaneously, improving light output efficiency through enhanced electric field interaction while the layer structure provides alignment tolerance.
Solution Approach 2:
The overlapping configuration allows the light emitting elements to interact with multiple electrodes (first and second electrodes) simultaneously, serving multiple functions: electrical connection, electric field enhancement, and alignment reference, thereby improving light output efficiency without proportionally increasing manufacturing complexity.
3Object-affected harmful factors
If the first electrode is provided in a plate shape between the pixel circuit layer and the display element layer, then the shielding effect against electric fields is improved, but the area occupied by the electrode increases
Solution Approach 1:
The first electrode is configured as a plate-shaped conductive layer with extended area specifically positioned between the pixel circuit layer and display element layer. This localized expansion of the electrode in the horizontal plane creates an effective shielding barrier against electric field interference from adjacent structures, while the plate shape provides broad coverage with minimal vertical profile.
Solution Approach 2:
The plate-shaped first electrode acts as an intermediary shielding layer between the pixel circuit layer and display element layer, blocking electric field interference from the circuit layer from reaching the light emitting elements in the display layer, thus protecting sensitive components without requiring changes to the circuit layer itself.
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 improves light output efficiency, enhances the reliability of light emitting elements by using one electrode as a shielding member, and facilitates high-resolution displays by minimizing defects and misalignment.
Implementation Method 1
a first insulating layer disposed on the transistor and the first electrode
Implementation Method 2
the light emitting elements may overlap the first and second electrodes on a plan view and a cross-sectional view
Implementation Method 3
enhances the reliability of light emitting elements by using one electrode as a shielding member blocking an electric field induced from configurations positioned below the one electrode
Data Source
AI summary
A pixel may include a pixel circuit layer including at least one transistor and a first electrode disposed on a substrate, and a first insulating layer disposed on the at least one transistor and the first electrode, and a display element layer disposed on the pixel circuit layer, the display element layer including a second electrode electrically connected to the at least one transistor, and a plurality of light emitting elements electrically connected to each of the first and second electrodes. The first electrode and the second electrode may be disposed on different layers and may be spaced apart from each other. The plurality of light emitting elements may overlap the first and second electrodes in a plan view and a cross-sectional view.