Multi-mode OLED with Controllable Reflectance
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Solution Overview
Problem
Current OLED technologies face challenges in achieving efficient and flexible display solutions that can switch between transparent, emissive, and reflective modes to meet various application requirements, such as indoor and outdoor use, without the need for polarizers or complex control systems.
Innovation Solution
Incorporating a controllable-reflectance optical thin film layer, which can adjust its reflectivity and transparency via electrical signals, integrated into the OLED stack, allowing for flexible display modes and eliminating the need for polarizers by altering the optical properties of the anode and cathode electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional OLED structures are used, then the display can emit light effectively, but it cannot switch between transparent, emissive, and reflective modes
Solution Approach 1:
The patent applies dynamics by making the optical properties of the OLED device switchable between different states. The anode and cathode electrodes are designed with controllable reflectance properties that can be dynamically adjusted between reflective and transparent states, enabling the display to switch between emissive, reflective, and transparent modes without adding complex mechanical moving parts.
Solution Approach 2:
The patent implements parameter changes by modifying the optical parameters (reflectance and transparency) of the electrode materials. By changing the electrical or optical state of the anode and cathode electrodes, the device can transition between different operational modes, achieving multi-functionality through parameter modulation rather than structural reconfiguration.
2Adaptability or versatility
If polarizers are added to enable mode switching, then transparency control is achieved, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for separate polarizer components by integrating the optical control function directly into the anode and cathode electrodes. The electrodes themselves are designed to provide the necessary optical modulation, removing the need for additional polarizing layers or control systems that would increase device complexity.
Solution Approach 2:
The patent applies universality by designing the anode and cathode electrodes to serve multiple functions: they provide both electrical conduction and optical modulation. The same electrodes that carry current also control the reflectance and transparency of the display, eliminating the need for separate dedicated control components.
3Adaptability or versatility
If multiple control structures are added for mode switching, then display versatility improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges the optical control function with the electrical electrode structure. By combining the reflectance control and transparency control functions into the existing anode and cathode electrode fabrication processes, the patent achieves multi-mode capability without requiring separate manufacturing steps for additional control structures.
Solution Approach 2:
The patent applies universality by designing the electrode materials and fabrication processes to simultaneously achieve electrical conduction and optical modulation in a single integrated structure, simplifying manufacturing by eliminating the need for separate control component fabrication.
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 displays that can seamlessly transition between transparent, emissive, and reflective modes, enhancing display efficiency and versatility for different applications, including virtual and augmented reality, while reducing the need for additional control structures.
Implementation Method 1
Incorporating a controllable-reflectance optical thin film layer, which can adjust its reflectivity and transparency via electrical signals
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Full color displays that include optical thin film layers with a controllable reflectance are provided. The layers allow for the overall transparency and display properties of each side of the display to be controlled, allowing for augmented reality displays virtual reality displays, two-sided signage, and the like.