Display Device Storage Capacitor Orientation for Emission Efficiency
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Solution Overview
Problem
Current display devices face challenges in maximizing emission efficiency while minimizing power consumption, particularly in securing a large enough area for light emitting elements and optimizing the arrangement of electrodes and storage capacitors to enhance luminance and reduce power requirements.
Innovation Solution
The display device incorporates a specific arrangement of first and second power lines, contact portions, and storage capacitors on a substrate, with a light emitting element and pixel circuit connected to a transistor and storage capacitor, allowing for efficient light emission across multiple sub-pixels with different colors, and includes a color conversion layer and filter to optimize light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the area for light emitting elements is increased to improve emission efficiency, then the emission efficiency increases, but the area available for other components (electrodes, storage capacitors) decreases
Solution Approach 1:
The storage capacitor is reoriented to extend in a second direction that is perpendicular to the first direction (in which sub-pixels are arranged). This dimensional change allows the capacitor to be positioned in the unused space between electrodes without encroaching on the light emitting element area, effectively utilizing previously wasted space and resolving the area conflict between emission elements and circuit components.
Solution Approach 2:
The pixel structure is segmented into distinct functional zones: light emitting elements in emission areas, electrodes in non-emission areas, and storage capacitors positioned in the remaining space between electrodes. This segmentation allows each component to occupy its optimal space without interfering with others, maximizing overall pixel efficiency while maintaining large emission areas.
2Use of energy by moving object
If the area for light emitting elements is increased to reduce power consumption, then power consumption decreases, but the arrangement complexity of electrodes and storage capacitors increases
Solution Approach 1:
The storage capacitor is designed with asymmetric orientation, extending in the second direction (perpendicular to sub-pixel arrangement) rather than parallel to it. This asymmetric placement optimizes space utilization by fitting into the irregular gaps between electrodes, simplifying the overall arrangement while maintaining large emission areas and reducing power consumption requirements.
3Device complexity
If the storage capacitor extends in the first direction parallel to sub-pixel arrangement, then the arrangement is simplified, but the emission area is reduced
Solution Approach 1:
The storage capacitor is reoriented from extending in the first direction (parallel to sub-pixel arrangement) to extending in the second direction (perpendicular to sub-pixel arrangement). This dimensional change allows the capacitor to be positioned in the previously unused space between electrodes, maximizing emission area while maintaining simple manufacturing processes and assembly.
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 increases emission efficiency and reduces power consumption by providing a sufficient area for light emitting elements and optimizing the arrangement of electrodes and storage capacitors, leading to improved luminance and reduced heat generation.
Implementation Method 1
a light emitting element on the first electrode and the second electrode
Implementation Method 2
a storage capacitor having a shape extending in a second direction that is different from the first direction in plan view
Data Source
AI summary
A display device may include: a first power line and a second power line located on a substrate; a first electrode electrically connected to the first power line through a first contact portion; a second electrode electrically connected to the second power line through a second contact portion and spaced apart from the first electrode in a first direction; a light emitting element located on the first electrode and the second electrode; and a pixel circuit including a transistor and a storage capacitor, and electrically connected to the light emitting element. The first contact portion may include a plurality of first contact portions successively arranged in the first direction. In a plan view, the storage capacitor may have a shape extending in a second direction different from the first direction.