Double-Sided Display Using Shared Quantum Light-Emitting Layer
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Solution Overview
Problem
Conventional double-sided displays are heavy, thick, and inefficient to produce due to the complex layer-by-layer preparation process of Quantum Dot-Light Emitting Displays (QD-LEDs), which increases production cost and reduces yield.
Innovation Solution
A double-sided display apparatus using quantum dots as light-emitting material, with a simplified structure that integrates charge transport particles within the quantum light-emitting layer, allowing for a single-layer or two-layer configuration instead of multiple layers, and employing a solution coating process for faster and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional layer-by-layer preparation process is used for QD-LED, then the display quality can be maintained, but the manufacturing complexity increases and production efficiency decreases
Solution Approach 1:
The patent combines multiple functional layers (hole transport layer, electron transport layer, and quantum dot light-emitting layer) into a single integrated quantum light-emitting layer containing charge transport particles and quantum dots. This merging reduces the number of separate layers from 5+ to 2, simplifying the manufacturing process while maintaining display quality through the multifunctional composite layer design.
Solution Approach 2:
The quantum light-emitting layer is designed to perform multiple functions simultaneously: it serves as the light-emitting layer, hole transport layer, and electron transport layer. The charge transport particles within the quantum light-emitting layer enable charge transport functionality, while the quantum dots provide light emission, making this single layer universal and eliminating the need for separate transport layers.
2Reliability
If a conventional layer-by-layer preparation process is used for QD-LED, then the display structure can be properly formed, but the production time increases and productivity decreases
Solution Approach 1:
The patent merges the preparation of multiple layers into a single quantum light-emitting layer formation step. Instead of sequentially depositing hole transport layer, electron transport layer, and quantum dot layer, the invention forms one integrated layer containing all necessary components, reducing the number of deposition cycles and significantly improving production efficiency while maintaining structural integrity.
Solution Approach 2:
The charge transport particles are pre-incorporated into the quantum light-emitting layer during its formation, rather than adding them separately afterward. This preliminary action ensures proper distribution of charge transport functionality within the light-emitting layer from the outset, eliminating subsequent processing steps and accelerating production.
3Adaptability or versatility
If two separate single-sided displays are attached back to back to create a double-sided display, then the display functionality is achieved, but the weight and thickness increase
Solution Approach 1:
The patent divides the double-sided display into two independent active surfaces sharing a common quantum light-emitting layer. Each substrate (first and second substrates) has transparent electrodes that face the shared quantum light-emitting layer, allowing independent driving of front and back displays. This segmentation approach eliminates the need for two complete display structures, reducing weight and thickness while maintaining full double-sided functionality.
4Adaptability or versatility
If two separate single-sided displays are attached back to back to create a double-sided display, then the display functionality is achieved, but the device thickness increases
Solution Approach 1:
The patent segments the display structure so that a single quantum light-emitting layer serves both front and back display functions. The first substrate and second substrate are positioned on opposite sides of the shared quantum light-emitting layer, with each substrate's transparent electrode facing the layer. This segmentation reduces thickness compared to stacking two complete displays, as the middle quantum light-emitting layer is shared rather than duplicated.
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 approach results in a lighter, thinner, more portable display with improved color gamut, brightness, and display quality, while reducing production steps and costs by simplifying the manufacturing process.
Implementation Method 1
Since electrons and holes are quantum confined, a continuous energy band structure becomes a discrete energy level structure with molecule characteristic
Implementation Method 2
the quantum dot can emit fluorescence after being excited. The emission spectrum of the QDs can be controlled by changing the size of the QDs
Implementation Method 3
the quantum light-emitting layer includes charge transport particles and quantum dots (QDs) light-emitting material
Data Source
AI summary
A double-sided display apparatus and a method of manufacturing the same are provided. The double-sided display apparatus includes a first substrate and a second substrate arranged opposite to each other; a first transparent electrode and a second reflective electrode arranged on the first substrate; a first reflective electrode opposed to the first transparent electrode on the first substrate and a second transparent electrode opposed to the second reflective electrode on the first substrate arranged on the second substrate; and a quantum light-emitting layer arranged between the respectively corresponded transparent electrodes and reflective electrodes, the quantum light-emitting layer including charge transport particles and QD light-emitting material mixed therein. The provided double-sided display apparatus is lighter, thinner, more portable, and of low cost.