OLED Display Architecture Multi-Plane Stacking
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Solution Overview
Problem
Current organic light-emitting devices (OLEDs) face challenges in achieving high color purity and sufficient device lifetime, particularly for blue OLEDs, which limits the performance of full-color displays.
Innovation Solution
An integrated OLED structure is devised, where a blue-emitting OLED is placed in a separate plane from red and green emitting OLEDs, with a common cathode or passivation layer configuration, allowing for a larger blue active area and potentially lower current density to mitigate stability issues, and the use of phosphorescent OLEDs for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If blue OLEDs are used in conventional single-plane configurations, then device structure is simplified, but device lifetime and stability deteriorate due to high current density requirements
Solution Approach 1:
The patent transitions from a conventional single-plane OLED configuration to a stacked multi-plane configuration where blue OLEDs are placed in a first plane and red/green OLEDs are placed in a second plane. This dimensional change allows the blue OLED active area to be superposed with red and green OLED active areas, effectively distributing the current load and reducing current density in the blue OLEDs, thereby improving device lifetime and stability without significantly increasing overall structural complexity.
2Reliability
If blue OLED active area is increased to reduce current density, then device lifetime improves, but display area for red and green pixels is reduced
Solution Approach 1:
By stacking blue OLEDs in a first plane and red/green OLEDs in a second plane, the patent enables the blue OLED active area to be larger than the sum of red and green active areas while maintaining adequate display area for all colors. The superposition of active areas in the vertical dimension resolves the area conflict, allowing each color to have sufficient emission area without compromising overall display area.
Solution Approach 2:
The patent implements a nested configuration where the blue OLED active area encompasses and is superposed with the red and green OLED active areas in the vertical stacking arrangement. This nesting allows the blue OLED to occupy a larger effective area while the red and green OLEDs are positioned within the same projected footprint, maximizing space utilization and maintaining adequate display area for all pixels.
3Reliability
If separate planes are used for blue and red/green OLEDs, then current density in blue OLEDs is reduced, but device structure complexity increases
Solution Approach 1:
The patent introduces a vertical stacking architecture with blue OLEDs in a first plane and red/green OLEDs in a second plane, separated by a common electrode. This dimensional separation effectively reduces current density in blue OLEDs by distributing the electrical load across different planes. The common electrode serves as a shared component between planes, which helps manage the increased structural complexity by providing a unified electrical interface.
Solution Approach 2:
The common electrode positioned between the first and second planes serves multiple functions: it acts as the cathode for the blue OLEDs in the first plane, the anode for the red and green OLEDs in the second plane, and provides electrical isolation between the two planes. This multi-functional design reduces the total number of electrodes required and simplifies the overall device structure despite the multi-plane configuration.
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 enhances the blue active area relative to red and green, reducing current density and addressing lifetime and stability issues, while enabling more efficient color rendering and improved display performance.
Implementation Method 1
the use of phosphorescent OLEDs for enhanced performance
Data Source
AI summary
A first device is provided. The first device comprises an integrated OLED structure disposed over a single substrate. The integrated OLED structure includes a blue-emitting OLED, a green emitting OLED, and a red emitting OLED. The blue emitting OLED has a first active area defined by a first electrode of the blue emitting OLED disposed in a first plane. The green emitting OLED has a second active area. The red emitting OLED has a third active area. The second and third active areas are disposed in a second plane different from and parallel to the first plane. Each of the second and third active areas are at least partially superposed with the first active area.