OLED Display Panel Anti-Reflection Layer for Higher Light Extraction
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Solution Overview
Problem
Existing OLED display panels face challenges in maximizing the extraction of light emitted by the emissive layer group, leading to suboptimal brightness and efficiency.
Innovation Solution
The display panel incorporates a light extraction layer with a refractive index lower than the encapsulation layer, forming an anti-reflection structure that enhances light emission, comprising multiple sub-layers with specific refractive indices and thicknesses to optimize light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional OLED structure without anti-reflection layer is used, then the device complexity is low, but the light extraction efficiency is insufficient leading to suboptimal brightness
Solution Approach 1:
The patent introduces a light extraction layer with intermediate refractive index (1.3-1.6) between the encapsulation layer (higher refractive index) and the emissive layer group, serving as an optical intermediary that gradually transitions the refractive index to minimize reflection and maximize light extraction efficiency
Solution Approach 2:
The light extraction layer is constructed using composite materials with specific refractive index properties, combining organic and inorganic components to achieve the optimal refractive index range that bridges the optical impedance mismatch between the encapsulation layer and the emissive layer group
2Object-affected harmful factors
If the refractive index of the light extraction layer is made closer to the encapsulation layer, then the anti-reflection effect is enhanced, but the light extraction efficiency decreases
Solution Approach 1:
The patent optimizes the refractive index parameter of the light extraction layer to fall within the specific range of 1.3-1.6, which is lower than the encapsulation layer's refractive index, creating an optimal gradient that simultaneously reduces reflection loss and maintains high light extraction efficiency
Solution Approach 2:
The light extraction layer is designed with specific local optical properties (refractive index 1.3-1.6 and thickness 50-200 nm) that are tailored to the specific interface between the encapsulation layer and emissive layer group, creating localized optimal conditions for light extraction at this critical interface
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 significantly improves the brightness and quantum luminous efficiency of the display panel, achieving efficiencies of 70% or more, surpassing prior art levels.
Implementation Method 1
A refractive index of the light extraction layer is smaller than that of the encapsulation layer so that the anti-reflection of light emitted by the emissive layer group is realized
Implementation Method 2
OLED display panels are self-illuminating, which typically comprise a cathode, an electron transport layer, an emissive layer (or an OLED light emitting device), a hole transport layer, an anode
Data Source
AI summary
The present application discloses a display panel and an onboard display apparatus. The display panel comprises a first electrode layer; an emissive layer group provided on the first electrode layer; a light extraction layer provided on the emissive layer group, the light extraction layer being in a light emission direction of the display panel and serving as a second electrode layer; and an encapsulation layer provided on the light extraction layer; wherein a refractive index of the light extraction layer is smaller than that of the encapsulation layer, so that the anti-reflection of light emitted by the emissive layer group is realized. In the display panel, the light extraction layer and the encapsulation layer form an anti-reflection layer, so that light emitted by the emissive layer group is emitted as much as possible, and the brightness of the display panel is improved.