OLED Third Electrode Microcavity Color Temperature Control
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Solution Overview
Problem
Traditional organic light emitting devices have limited color temperature adjustment range and significant brightness variations when large color temperature differences are required, due to the need for large voltage changes.
Innovation Solution
The organic light emitting device incorporates a third electrode insulated from the first electrode, with part of the third electrode overlapping the first electrode, creating two optical microcavities of different lengths, allowing for adjustable color temperature by varying the area or voltage of the electrodes, thereby increasing the color temperature adjustment range without significant brightness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large voltage changes are applied to adjust color temperature in traditional OLEDs, then color temperature adjustment range is improved, but brightness variation increases significantly
Solution Approach 1:
The device is segmented into two independent electrode systems: a first electrode (anode) and a second electrode (cathode) for basic device operation, plus a third electrode (auxiliary anode) specifically for color temperature control. This segmentation allows the third electrode to independently adjust color temperature through voltage control without affecting the brightness control mechanism of the first and second electrodes, thereby resolving the contradiction between color temperature adjustment range and brightness stability.
Solution Approach 2:
The patent implements dynamic control of the third electrode's voltage and effective area to adjust color temperature. By dynamically varying the voltage applied to the third electrode relative to the first electrode, and by dynamically adjusting the overlapping area between electrodes through device design, the system can achieve continuous color temperature adjustment while maintaining stable brightness output from the organic light emitting layer.
2Adaptability or versatility
If a third electrode is added to enable color temperature adjustment, then color temperature adaptability is improved, but device structure complexity increases
Solution Approach 1:
The patent merges the color temperature adjustment function with the existing electrode structure by making the third electrode overlap with the first electrode in a planar configuration. The third electrode is integrated into the same substrate plane and shares the insulating layer infrastructure, combining multiple functions (electrical conduction, color temperature control, and structural support) into a unified design that minimizes additional complexity.
Solution Approach 2:
The third electrode serves multiple functions: it acts as an auxiliary anode for hole injection, functions as a color temperature control element through voltage modulation, and its overlapping configuration with the first electrode creates a controllable effective emission area. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving enhanced color temperature adaptability.
3Illumination intensity
If the distance between first electrode and second electrode is increased to reduce brightness, then brightness control is improved, but device thickness increases
Solution Approach 1:
Instead of controlling brightness solely through the vertical distance between electrodes (one-dimensional approach that increases device thickness), the patent introduces a two-dimensional control mechanism by varying the overlapping area between the first and third electrodes. This allows brightness and color temperature to be adjusted by changing the lateral extent of electrode overlap rather than increasing device thickness, effectively moving the control parameter from the vertical dimension to the lateral dimension.
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 enables a broader range of color temperature adjustments with minimal changes in electrode voltage, maintaining consistent brightness, and allows for customization of light color temperature based on user requirements.
Implementation Method 1
Organic light emitting devices (OLEDs) can meet the requirements of low carbon environmental protection and green life for their various advantages such as solid-state luminous
Implementation Method 2
creating two optical microcavities of different lengths, allowing for adjustable color temperature by varying the area or voltage of the electrodes
Data Source
AI summary
An organic light emitting device and a manufacturing method thereof and a display apparatus are provided. The organic light emitting device includes a first electrode, a second electrode, a third electrode and an organic material functional layer, and the organic material functional layer is disposed between the first electrode and the second electrode, the third electrode is disposed on a side of the first electrode close to the organic material functional layer; the third electrode is insulated from the first electrode, and part of the third electrode is overlapped with the first electrode; a distance between the first electrode and the second electrode is greater than a distance between the third electrode and the second electrode.