Stacked OLED Light Emitting Device with Independent Unit Control
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Solution Overview
Problem
OLED display substrates face issues with nonuniform display due to differential decay rates of red, green, and blue luminescent materials, leading to reduced service life and display defects.
Innovation Solution
A light emitting device with a first and second electrode and a third electrode between adjacent units, where the first and second electrodes are coupled to a single signal terminal, and the third electrode is coupled to a separate signal terminal, allowing independent control of light emission for each unit, thereby extending the service life and improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If red, green, and blue luminescent materials are used in OLED display substrates, then colorful display is achieved, but nonuniform display occurs due to differential decay rates of the luminescent materials
Solution Approach 1:
The light emitting device is divided into multiple independently controllable light emitting units (first, second, and third light emitting units) that can be controlled separately through different signal terminals. This segmentation allows selective activation of specific units to compensate for decay differences among red, green, and blue luminescent materials, thereby maintaining display uniformity while preserving colorful display capability
2Ease of operation
If multiple light emitting units are stacked between electrodes, then light emission control is improved, but device structure becomes more complex
Solution Approach 1:
The first and second electrodes serve multiple functions: they act as common electrodes for all light emitting units while simultaneously serving as control electrodes for specific units when connected to different signal terminals. The third electrode functions as both a structural separator between light emitting units and an independent control terminal. This multi-functionality reduces the need for additional dedicated control electrodes, thereby improving light emission control without proportionally increasing device structure complexity
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 configuration allows for independent control of light emission, reducing display defects and increasing the service life of OLED devices by ensuring uniform brightness and color output across the display substrate.
Implementation Method 1
a plurality of light-emitting units stacked between the first electrode and the second electrode
Data Source
AI summary
The present disclosure provides a light emitting device, a display substrate and a display device. The light emitting device of the present disclosure includes: a first electrode and a second electrode opposite to each other; a plurality of light-emitting units stacked between the first electrode and the second electrode; and a third electrode between adjacent light-emitting units. The first electrode and the second electrode are both electrically coupled to a first signal terminal, the third electrode is coupled to a second signal terminal, and the first signal terminal is configured to provide a first signal and the second signal terminal is configured to provide a second signal such that only part of the plurality of light-emitting units emits light at a same time.