OLED Blue Unit Structure for Higher Lifetime With Simpler Manufacturing
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Solution Overview
Problem
Current organic light-emitting diode (OLED) devices, particularly in automotive applications, face challenges with the efficiency and lifetime of blue light materials, and the manufacturing process of stacked tandem type OLED devices is complex, increasing production costs and reducing yield.
Innovation Solution
An organic light-emitting diode device with a light-emitting material layer comprising a first and second common blue light-emitting layer, and a light-emitting unit layer with red, green, and blue units in parallel, where the blue units include charge connecting layers electrically connected to their surfaces, and all units are quantum dot layers, reducing the need for multiple chambers and precision photomasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stacked tandem type structure is used to improve electric current efficiency and lifetime, then efficiency and lifetime increase by 1.5-2 times and 2-4 times respectively, but manufacturing complexity increases due to double vapor deposition chambers and multiple precision photomasks
Solution Approach 1:
The invention segments the blue light-emitting function into two separate blue light-emitting layers (first and second blue light-emitting layers) positioned at different locations within the device structure. This segmentation allows each blue layer to contribute to overall efficiency and lifetime independently, achieving tandem-type performance benefits while avoiding the need for complex stacked tandem manufacturing processes with multiple vapor deposition chambers.
2Use of energy by moving object
If stacked tandem type structure is used to improve electric current efficiency, then efficiency increases by 1.5-2 times, but production cost increases due to multiple precision photomasks and chambers
Solution Approach 1:
The invention merges the functionality of multiple blue light-emitting units into a single parallel-mounted structure where first and second blue light-emitting layers work together. This combining approach achieves the electric current efficiency improvements associated with tandem structures (1.5-2 times enhancement) while using a simplified single-chamber manufacturing process, thereby reducing production costs associated with multiple vapor deposition chambers and precision photomasks.
3Duration of action of stationary object
If stacked tandem type structure is used to improve lifetime, then lifetime increases by 2-4 times, but aperture ratio and product yield decrease due to multiple chambers and photomasks
Solution Approach 1:
The invention transitions from the vertical stacking dimension of tandem structures to a parallel-mounted configuration where first and second blue light-emitting layers are positioned at different horizontal locations. This dimensional change allows the device to achieve extended lifetime (2-4 times improvement) without the need for multiple vapor deposition chambers and precision photomasks, thereby preserving aperture ratio and improving product yield.
4Ease of manufacture
If parallel-mounted type structure is used to simplify manufacturing, then production cost decreases and aperture ratio increases, but electric current efficiency and lifetime of blue light material are insufficient
Solution Approach 1:
The invention applies local quality enhancement by introducing two distinct blue light-emitting layers (first and second blue light-emitting layers) with potentially different material compositions and characteristics at specific locations within the parallel-mounted structure. This localized optimization allows the device to maintain the manufacturing simplicity and cost-effectiveness of parallel-mounted types while achieving improved electric current efficiency and extended lifetime through the combined contribution of both blue layers.
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
Improves electric current efficiency and lifetime of parallel-mounted type OLED devices, reduces production costs, and increases aperture ratio and yield by simplifying the manufacturing process compared to stacked tandem types.
Implementation Method 1
the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit are all quantum dot light-emitting layers
Implementation Method 2
the blue light-emitting unit includes a blue light-emitting layer and charge connecting layers electrically connected to an upper surface and a lower surface of the blue light-emitting layer
Data Source
AI summary
An organic light-emitting diode device and a display panel are provided. The display panel includes the organic light-emitting diode device. The organic light-emitting diode device includes a light-emitting material layer. The light-emitting material layer includes a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit; wherein the blue light-emitting unit includes a blue light-emitting layer and a charge connecting layer arranged in a stack.