Organic Light Emitting Display Substrate with Light Guide Layer
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Solution Overview
Problem
Conventional organic light emitting display substrates suffer from reduced luminance due to limited light emission area and increased light loss as emitted light passes through multiple layers, restricting the ratio of light-emitting area to the total substrate area and resulting in lower brightness.
Innovation Solution
The organic light emitting display substrate incorporates a light guide layer with a light incident surface opposite to the organic light emitting diode's light outgoing surface, allowing light to enter and be emitted from the substrate side, while the drive transistor is positioned away from the light path to prevent obstruction, along with reflective electrodes and layers to enhance light reflection and reduce loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted from the top surface of the organic light emitting layer, then the light emission area is limited by the device structure, but the light loss increases as it passes through multiple layers
Solution Approach 1:
The patent inverts the conventional light emission direction by using the substrate side as the light emission surface instead of the top surface. The organic light emitting layer is configured to emit light toward the substrate, and the substrate surface serves as the light outgoing surface. This inversion eliminates the need for light to pass through multiple upper layers (electrodes, encapsulation layers), significantly reducing light loss and improving luminance extraction efficiency.
2Illumination intensity
If the light emitting area is increased to improve brightness, then the ratio of light-emitting area to total substrate area increases, but the device structure becomes more complex
Solution Approach 1:
The substrate serves multiple functions: it acts as both the structural support and the light outgoing surface. The bottom surface of the substrate is configured as the light emission surface, allowing the entire substrate area to contribute to light emission without requiring additional complex structures. This multi-functional design simplifies the device structure while maximizing the light-emitting area ratio.
3Loss of energy
If reflective electrodes and layers are added to reduce light loss, then the light reflection and loss reduction improve, but the device structure becomes more complex
Solution Approach 1:
The substrate itself is designed to serve as the light outgoing surface, utilizing its own bottom surface for light emission. This self-service approach eliminates the need for additional reflective electrodes or light extraction structures that would otherwise be required to improve light outcoupling. The substrate's bottom surface naturally serves the dual purpose of structural support and light emission, reducing overall device 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 increases the light-emitting area ratio, enhances luminance by reducing light loss, and allows for a more efficient light emission path, resulting in improved brightness and reduced substrate volume.
Implementation Method 1
a light guide layer including a light incident surface through which light is incident into the light guide layer, where the light incident surface is disposed opposite to the light outgoing surface of the organic light emitting diode so that the light emitted from the light outgoing surface enters the light guide layer which is configured to cause the light entering from the light incident surface to be emitted from a surface of the light guide layer proximal to the substrate
Implementation Method 2
the organic light emitting diode successively includes: a first reflective electrode, an organic light emitting layer, and a second reflective electrode
Data Source
AI summary
The present disclosure provides an organic light emitting display substrate and a method for manufacturing the same. The organic light emitting display substrate includes a substrate, and a drive transistor and an organic light emitting diode disposed on the substrate. In a direction away from the substrate, the organic light emitting diode successively includes: a first reflective electrode, an organic light emitting layer, and a second reflective electrode. A drain of the drive transistor is electrically coupled to the first reflective electrode. The organic light emitting display substrate further includes a light guide layer. One side surface of the light guide layer is the light incident surface. The light incident surface is disposed opposite to the light outgoing surface of the organic light emitting diode so that the light emitted from the light outgoing surface enters the light guide layer.