QLED Light-Emitting Layer Layout Without Partitions
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Solution Overview
Problem
The formation of a larger partition area in quantum dot light-emitting diode (QLED) display devices leads to a smaller light-emitting layer area, resulting in a lower aperture ratio and reduced brightness due to the solution coating method used in manufacturing.
Innovation Solution
Incorporating quantum dots covered by ferritin, bonded via peptides, between pixel electrodes and a common electrode, eliminating the need for partitions and enhancing the aperture ratio and brightness by allowing selective disposition of quantum dots on electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a partition is formed to distinguish adjacent light-emitting layers using solution coating method, then color differentiation is achieved, but the aperture ratio decreases and brightness is reduced
Solution Approach 1:
The patent removes the partition structure from the display device configuration. Instead of using partitions to distinguish adjacent light-emitting layers, the invention employs quantum dots with inherently different emission wavelengths that can be directly applied to pixel electrodes through solution coating, eliminating the need for partitions and thereby increasing the aperture ratio and brightness
Solution Approach 2:
The patent introduces quantum dots as an intermediary substance that enables color differentiation without requiring physical partitions. The quantum dots are suspended in a solution that can be coated directly onto the pixel electrodes, serving as a mediating mechanism that achieves color distinction while maintaining high aperture ratio
2Manufacturing precision
If a partition is formed to distinguish adjacent light-emitting layers, then manufacturing precision is improved, but the light-emitting layer area is reduced
Solution Approach 1:
The patent extracts and eliminates the partition structure from the manufacturing process. By using quantum dots with distinct emission wavelengths that can be selectively applied to different pixel electrodes, the invention achieves precise light-emitting layer positioning without requiring physical partitions, thereby maximizing the light-emitting layer area
Solution Approach 2:
The patent changes the parameter used for distinguishing adjacent light-emitting layers from physical spatial separation (partitions) to optical parameter differentiation (quantum dot emission wavelengths). This parameter change allows direct solution coating onto pixel electrodes without partitions, increasing the light-emitting layer area while maintaining manufacturing precision through wavelength-selective quantum dot application
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 approach results in a display device with improved brightness and aperture ratio by enabling efficient formation of light-emitting layers without the need for partitions, thus optimizing the display's color differentiation and overall performance.
Implementation Method 1
a first light-emitting layer configured to emit light of a first color by applying a first quantum dot covered by ferritin on the first pixel electrode
Implementation Method 2
the first pixel electrode and the first quantum dot are bonded via a peptide modifying the ferritin
Data Source
AI summary
A display device includes a plurality of pixel electrodes, a common electrode common to the plurality of pixel electrodes, and a light-emitting layer sandwiched between the plurality of pixel electrodes and the common electrode. The light-emitting layer includes quantum dots covered by ferritin. Each of the plurality of pixel electrodes and the quantum dots are bonded via a peptide modifying the ferritin.