Display Electrode Layout Using AC Electroosmosis for Pixel Luminance
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Solution Overview
Problem
Current display devices face challenges in improving the luminance of sub-pixels, as non-emitting light emitting elements are not effectively aligned to emit light, leading to inefficiencies in light emission.
Innovation Solution
A display device design featuring auxiliary electrodes and a bank layer, where an alternating current signal is applied to align light emitting elements using AC electroosmosis, allowing them to move and be disposed on electrodes for enhanced light emission, thereby improving luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are disposed in sub-pixel areas, then the display device can be manufactured, but the luminance of sub-pixels is insufficient because non-emitting light emitting elements do not contribute to light output
Solution Approach 1:
The patent makes the light emitting elements movable by applying an AC signal to auxiliary electrodes, which generates electroosmotic flow to dynamically reposition the light emitting elements from the sub-area to the light emitting area, transforming them from non-emitting to light-emitting state
Solution Approach 2:
The patent changes the electrical state of the auxiliary electrodes by applying an AC signal, which alters the physical state of the liquid crystal medium and enables movement of light emitting elements, thereby changing their functional state from inactive to active
2Illumination intensity
If auxiliary electrodes are added to align light emitting elements, then luminance is improved, but device complexity increases
Solution Approach 1:
The patent segments the electrode system into main electrodes for light emission and auxiliary electrodes for alignment control, allowing independent functionality of each electrode type without interfering with the other
Solution Approach 2:
The auxiliary electrodes act as an intermediary component that mediates the positioning of light emitting elements through electroosmotic flow, enabling precise control without direct mechanical manipulation
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
The method effectively increases the number of light emitting elements that emit light, enhancing the luminance of sub-pixels by aligning and positioning them within the light emitting area.
Implementation Method 1
utilizes an AC signal to align light emitting elements using AC electroosmosis
Data Source
AI summary
A display device comprises a light emitting area and a sub-area spaced apart from each other a first electrode and a second electrode disposed on a substrate and spaced apart from each other, a first insulating layer disposed on the first electrode and the second electrode, a bank layer disposed on the first insulating layer and disposed between the light emitting area and the sub-area, light emitting elements disposed on the first electrode and the second electrode, a first connection electrode electrically connected to an end of the light emitting element and a second connection electrode connected to another end of the light emitting element, and auxiliary electrodes disposed between the substrate and the bank layer and spaced apart from each other with the light emitting area and the sub-area disposed between the auxiliary electrodes.