Flexible OLED Pixel Layout With Selective Optical Coupling
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Solution Overview
Problem
Flexible OLED display panels face challenges in achieving high luminous efficiency and long service life due to limitations in organic small molecule evaporation processes and material constraints, particularly affecting blue light-emitting elements, which also contribute to higher power consumption.
Innovation Solution
A flexible display panel structure featuring an array substrate with an anode layer, organic light-emitting layer, cathode layer, optical coupling output layer, and thin film encapsulation layer, where the optical coupling output layer is only positioned over red and green pixel units, and the thin film encapsulation layer includes a multi-layered inorganic barrier structure to enhance blue light efficiency, reduce power consumption, and simplify the evaporation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical coupling output layer is arranged corresponding to all pixel units (red, green, and blue), then the light extraction efficiency is improved, but the power consumption increases and the service life decreases
Solution Approach 1:
The optical coupling output layer is selectively arranged only above the red and green pixel units, not above the blue pixel unit. This local differentiation allows red and green pixels to benefit from enhanced light extraction through the optical coupling layer, while blue pixels operate without the additional energy consumption and material degradation associated with the organic small molecule evaporation process required for the optical coupling layer, thus resolving the contradiction between light extraction efficiency and power consumption/service life.
2Illumination intensity
If the optical coupling output layer is produced by evaporation deposition of organic small molecules, then the light emission efficiency is improved, but the service life is shortened due to material limitations
Solution Approach 1:
The optical coupling output layer is applied only to red and green pixel units where it can enhance luminous efficiency through improved light extraction. The blue pixel unit deliberately excludes this layer, avoiding the service life limitations imposed by organic small molecule evaporation materials, thus achieving optimal service life for blue pixels while maintaining high efficiency for red and green pixels.
Solution Approach 2:
The patent accepts that the optical coupling output layer using organic small molecules has limited service life, but strategically applies it only where it provides the most benefit (red and green pixels), while relying on the inherently longer-lived blue pixel structure without this layer, effectively managing the trade-off between efficiency enhancement and material longevity.
3Productivity
If the optical coupling output layer is arranged over all pixel units, then the luminous efficiency is maximized, but the evaporation process complexity and production cost increase
Solution Approach 1:
The optical coupling output layer is selectively positioned only above red and green pixel units, eliminating the need to perform organic small molecule evaporation deposition over the entire display area. This reduces evaporation process complexity, decreases material consumption, and lowers production costs while still achieving high luminous efficiency where the optical coupling layer provides the most benefit.
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 maximizes red and green light efficiency, improves blue light efficiency, prolongs the service life of the display panel, reduces power consumption, and lowers production costs by simplifying the evaporation process and replacing the optical coupling output layer with an inorganic barrier layer for the blue pixel unit.
Implementation Method 1
an optical coupling output layer, and a thin film encapsulation layer. The array substrate is provided with an anode layer. The organic light-emitting layer is disposed on the anode layer and comprises a red pixel unit, a green pixel unit, and a blue pixel unit
Implementation Method 2
The thin film encapsulation layer comprises a first inorganic barrier layer, an organic barrier layer, and a second inorganic barrier layer. The first inorganic barrier layer is disposed on the optical coupling output layer and the cathode layer corresponding to the blue pixel unit
Implementation Method 3
a water vapor transmission rate of the second inorganic layer is less than 1 × 10-4 g/ (m2• 24 h)
Data Source
AI summary
A flexible display panel is provided. The flexible display panel includes an array substrate, an organic light-emitting layer, a cathode layer, an optical coupling output layer, and a thin film encapsulation layer stacked on each other. The organic light-emitting layer includes a red pixel unit, a green pixel unit, and a blue pixel unit. The optical coupling output layer is arranged corresponding to the red pixel unit and the green pixel unit. The thin film encapsulation layer corresponding to the blue pixel unit of the organic light-emitting layer is in contact with the cathode layer.