Subpixel Electrode Layout for High-Aperture Display Pixels
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Solution Overview
Problem
Conventional display devices face challenges in achieving a high aperture ratio and efficient light emission due to the limited space for light-emitting elements and electrodes, leading to reduced luminance and increased complexity in pixel arrangements.
Innovation Solution
The display device incorporates a novel pixel arrangement with subpixels having distinct emission areas and sub-areas, where electrodes are strategically positioned to maximize space for light-emitting elements, and color control structures are used to enhance light output, including wavelength conversion layers and light-transmitting layers to optimize light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional pixel arrangements are used, then the structure is simple, but the aperture ratio is insufficient and luminance is reduced
Solution Approach 1:
Each subpixel is divided into distinct emission area and sub area, with electrodes strategically positioned in the sub area to maximize light-emitting element space. This segmentation allows independent optimization of light emission and electrode placement, resolving the contradiction between luminance and structural simplicity.
Solution Approach 2:
The patent introduces a novel three-dimensional spatial arrangement where electrodes are positioned in the sub area beneath or adjacent to the emission area, utilizing vertical and lateral spacing to maximize aperture ratio without increasing planar complexity. This dimensional optimization enables higher luminance while maintaining manageable structural complexity.
2Area of moving object
If more space is allocated for electrodes, then electrode functionality is improved, but the space for light-emitting elements is reduced
Solution Approach 1:
The subpixel area is segmented into emission area for light-emitting elements and sub area for electrodes, allowing each component to occupy its dedicated space without interference. This segmentation ensures maximum space for light emission while maintaining sufficient area for electrode functionality.
Solution Approach 2:
Electrodes are arranged in multiple layers and positions (first electrode, second electrode, third electrode, fourth electrode) utilizing vertical stacking and lateral distribution. This three-dimensional electrode arrangement provides sufficient electrode functionality while minimizing the planar footprint, thereby maximizing space for light-emitting elements.
3Area of stationary object
If a novel pixel arrangement with distinct emission areas and sub-areas is used, then aperture ratio is improved, but manufacturing complexity increases
Solution Approach 1:
The consistent segmentation pattern of emission areas and sub areas across all subpixels creates a modular structure that simplifies manufacturing. Each subpixel follows the same template, allowing for standardized fabrication processes despite the novel arrangement, thereby improving aperture ratio without excessive manufacturing complexity.
Solution Approach 2:
Adjacent subpixels share common electrode structures and boundaries (e.g., second electrode contact parts at boundaries, third electrodes between subpixels), merging repetitive elements into unified structures. This merging reduces the total number of discrete components and simplifies the manufacturing process while maintaining the high aperture ratio benefits of the novel arrangement.
4Area of stationary object
If electrodes are densely packed, then device area is reduced, but space for light emission is limited
Solution Approach 1:
Electrodes are distributed across multiple dimensions including vertical stacking (first through fourth electrodes at different heights/positions) and lateral arrangement within the sub area. This multi-dimensional electrode packing achieves high device density while preserving adequate planar and vertical space for light-emitting elements in the emission area, thereby maintaining both compact device area and sufficient light emission space.
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 ensures a sufficient aperture ratio, maintains high luminance, and simplifies the pixel structure, enabling a more efficient and high-resolution display device design.
Implementation Method 1
a plurality of light emitting elements disposed in each of the plurality of subpixels and disposed on the plurality of electrodes
Implementation Method 2
color control structures are used to enhance light output, including wavelength conversion layers and light-transmitting layers
Data Source
AI summary
A display device includes pixels including subpixels, electrodes spaced apart from each other in a first direction, extending in a second direction, and disposed in the subpixels, light emitting elements in the subpixels and on the electrodes, and contact electrodes electrically contacting the light emitting elements and the electrodes. The subpixels each includes an emission area including the light emitting elements, and a sub area spaced apart from the emission area. The pixels each includes a first subpixel including a first emission area and a sub area on a first side of the first emission area, and a second subpixel which is disposed on a first side of the first subpixel and includes a second emission area and a sub area disposed on a second side of the second emission area. The sub area of the second subpixel is disposed side by side with the first emission area.