Quantum Dot OLED With Capacitor Voltage Stabilization
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Solution Overview
Problem
Organic electroluminescent display devices have low luminous efficiency due to inadequate light emission and charge management.
Innovation Solution
Incorporating Q+ and Q− quantum dot layers between the cathode and anode, with a capacitor connected to these layers, allowing them to emit light waves of the same wavelength as the light emitting layer, and charging/discharging to maintain stable voltage for continued light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional light emitting layer is used between electron and hole emission layers, then the device structure is simple, but the luminous efficiency is very low
Solution Approach 1:
The light emitting layer is segmented into three functional components: Q+ quantum dot layer for light emission, light emitting layer for color conversion, and Q- quantum dot layer for light emission. This segmentation allows each layer to specialize in specific functions, significantly improving overall luminous efficiency while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The patent merges multiple light emission mechanisms into a single integrated structure. The Q+ and Q- quantum dot layers emit light that combines with the light from the light emitting layer to produce enhanced luminous output. This merging of emission sources resolves the contradiction by achieving high efficiency without proportionally increasing structural complexity.
2Use of energy by moving object
If the control device is switched off, then energy consumption is reduced, but the light emitting layer cannot maintain stable voltage and light emission stops
Solution Approach 1:
The capacitor is pre-charged during the on-state before the control device is switched off. This preliminary charging action stores electrical energy that is then released to maintain stable voltage across the light emitting layer during the off-state, enabling continued light emission without requiring continuous power supply and thus reducing overall energy consumption.
Solution Approach 2:
The capacitor ensures continuous voltage supply to the light emitting layer by discharging stored energy during the off-state. This creates a continuous light emission effect that bridges the on and off states, maintaining visual output stability while allowing intermittent power supply to reduce energy consumption.
3Loss of energy
If Q+ and Q- quantum dot layers are added to increase luminous efficiency, then light emission is enhanced, but the device structure becomes more complex
Solution Approach 1:
The Q+ and Q- quantum dot layers serve multiple functions: they emit light directly, assist in charge transport, and work synergistically with the light emitting layer to enhance overall luminous efficiency. This multi-functionality justifies the increased structural complexity by delivering disproportionate performance benefits in terms of energy efficiency and light output.
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
Significantly increases luminous efficiency and improves display effects by enhancing light emission and maintaining stable voltage for prolonged light output.
Implementation Method 1
The Q+ quantum dot layer and the Q− quantum dot layer are used for emitting light waves having the same wavelength as those of the light emitting layer
Implementation Method 2
the capacitor charges when a control device for controlling the light emission of the light emitting layer is switched on and starts to discharge when the control device is switched off
Data Source
AI summary
The present invention relates to the technical field of display devices, and discloses an organic electroluminescent display device. The display device comprises a cathode, a Q+ quantum dot layer, a light emitting layer, a Q− quantum dot layer, and an anode stacked together. The display device further comprises a capacitor, two electrode plates of which are connected with the Q+ quantum dot layer and the Q− quantum dot layer respectively, wherein the Q+ quantum dot layer and the Q− quantum dot layer are used for emitting light waves having the same wavelength as those of the light emitting layer, and wherein the capacitor charges when a control device for controlling the light emission of the light emitting layer is switched on and starts to discharge when the control device is switched off.