OLED Display Panel with Laminated Sub-Pixels for Service Life Extension
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Solution Overview
Problem
As the service time of OLED display devices increases, electrons and holes that do not recombine accumulate, leading to a continuous rise in threshold voltage, reducing luminance and energy utilization efficiency, and affecting the service life of the device.
Innovation Solution
A display panel design with sub-pixels featuring multiple light-emitting units in a laminated mode, where a transparent electrode is placed between adjacent units, allowing each unit to be driven by adjacent electrodes, enabling alternate operation to reduce the workload on each unit and extend service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If multiple light-emitting units are arranged in a laminated mode with transparent electrodes between them, then the service life of the display panel is extended, but the device complexity increases
Solution Approach 1:
The light-emitting unit is divided into multiple sub-units (first light-emitting unit, second light-emitting unit, etc.) arranged in a laminated structure. Each sub-unit has its own electrodes and can operate independently, allowing alternating operation to extend overall service life while managing complexity through modular design
Solution Approach 2:
The multiple light-emitting units are designed to operate in alternating periods rather than continuously. By switching between different units in a periodic manner, the overall service life is extended while each individual unit experiences reduced operational stress, balancing longevity with manageable device complexity
2Stability of the object's composition
If multiple light-emitting units are used in a laminated mode, then luminance stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The display panel is segmented into multiple light-emitting units with distinct functional layers (hole transport layer, light-emitting layer, electron transport layer) arranged in a laminated structure. This segmentation allows for better control of charge carrier injection and recombination in each unit, improving luminance stability while enabling modular manufacturing processes
Solution Approach 2:
Different regions of the display panel can have different light-emitting unit configurations optimized for specific performance requirements. The transparent electrode placement and layer structures are locally optimized to achieve uniform luminance output across the panel while managing manufacturing precision requirements through targeted design adjustments
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 design effectively reduces the operational hours of each light-emitting unit, thereby lengthening the service life of the OLED display panel without compromising light-emitting performance by ensuring that only one unit is active during each half cycle of the AC driver, improving luminance stability and energy efficiency.
Implementation Method 1
When voltages are applied to the anode and the cathode, electrons may be transferred from the cathode to the light-emitting layer through the electron transport layer, and holes may be transferred from the anode to the light-emitting layer through the hole transport layer. The electrons and holes meet in the light-emitting layer and recombine to form excitons. Excitons can transfer energy to the light-emitting molecules in the light-emitting layer under the action of an electric field, to enable the light-emitting molecules to emit visible light.
Data Source
AI summary
A display panel, a driving method thereof, and a display device are provided in the field of display technology. The display panel includes: a plurality of sub-pixels arranged in an array. The plurality of sub-pixels arranged in an array include at least one target sub-pixel, and each target sub-pixel includes: a first electrode, a second electrode and N light-emitting units arranged in a laminated mode between the first electrode and the second electrode, wherein N is an integer greater than 1. A transparent electrode is arranged between any two adjacent light-emitting units among the N light-emitting units, and each light-emitting unit is configured to emit light under the drive of two electrodes adjacent thereto.