Micro-LED Pixel Structure With Electrophoretic Lens Angle Control
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Solution Overview
Problem
Existing display devices have insufficient divergence angles, limiting user experience for viewers positioned diagonally relative to the display, and lack the ability to display different images simultaneously for multiple viewing angles.
Innovation Solution
A pixel structure incorporating a micro light-emitting diode and an electrophoretic structure with adjustable divergence angles, utilizing an electrophoretic lens driven by an electric field to refract light at varying angles, and an electrochromic structure to selectively block light, allowing for diverse image presentation based on viewer position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional pixel structure is used, then the device is simple and easy to manufacture, but the divergence angle is insufficient and user experience for diagonal viewers deteriorates
Solution Approach 1:
The electrophoretic lens is embedded within the electrophoretic medium, which is contained in the electrophoretic structure. This nested configuration allows the electrophoretic lens to be positioned and moved within the medium to adjust the divergence angle of light emitted by the pixel, thereby improving adaptability without significantly increasing overall device complexity
Solution Approach 2:
The electrophoretic lens is designed to be movable within the electrophoretic medium under the influence of an electric field. This dynamic capability enables real-time adjustment of the divergence angle, allowing the pixel structure to adapt to different viewing angles and positions, thus resolving the contradiction between fixed simple structures and adaptable complex structures
2Adaptability or versatility
If a fixed divergence angle is used, then the device complexity is low, but the ability to display different images for multiple viewing positions is limited
Solution Approach 1:
The electrophoretic lens can be dynamically repositioned within the electrophoretic medium by applying different electric fields. This dynamic adjustment capability enables the same pixel structure to display different images or content for viewers at different positions, significantly improving image presentation capability without requiring multiple fixed pixel structures
Solution Approach 2:
The electrophoretic structure serves multiple functions: it acts as a medium for lens movement, provides electric field control, and enables divergence angle adjustment. This multi-functionality allows a single pixel structure to serve multiple viewing positions and purposes, enhancing versatility while avoiding the need for separate structures for each function
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
Enables display devices to provide tailored images for different viewing positions, enhancing user experience by adjusting divergence angles and enabling simultaneous display of distinct images for multiple viewers without requiring split screens.
Implementation Method 1
The electrophoretic lens moves away from or toward the micro light-emitting diode by being driven by an electrostatic force generated by the electric field
Implementation Method 2
The electrophoretic lens has a second refractive index, and the second refractive index is different from the first refractive index. The light passing through the electrophoretic lens has a first divergence angle or a second divergence angle after refracting
Data Source
AI summary
A pixel structure is provided. The pixel structure includes a substrate, a micro light-emitting diode, and an electrophoretic structure. The micro light-emitting diode is disposed on the substrate and configured to emit light. The electrophoretic structure is disposed on the micro light-emitting diode and includes an upper electrode, a lower electrode, an electrophoretic medium, and an electrophoretic lens. The electrophoretic medium is disposed between the upper electrode and the lower electrode, wherein the electrophoretic medium has a first refractive index. The electrophoretic lens is disposed in the electrophoretic medium and has a second refractive index that is different from the first refractive index. The electrophoretic lens is configured to move away from or toward the micro light-emitting diode by being driven by the electric field, so that light passing through the electrophoretic lens has a first or second divergence angle after refracting.