OLED Substrate Dual Cathode Top Bottom Emission
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Solution Overview
Problem
Existing OLED display technology has a low aperture ratio and inefficient light emission due to wasted electroluminescent material, resulting in low brightness and limited light emitting area, as the light emitting material is coated on the entire surface, including areas covered by electronic elements.
Innovation Solution
An OLED substrate design featuring a transparent anode and a reflective cathode, allowing for top and bottom emission in separate regions, increasing the light emitting area and aperture ratio, with the anode covering the electronic elements and the cathode covering the remaining area, enabling double-sided display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting material is coated on the entire surface including areas covered by electronic elements, then the light emitting layer is continuous and complete, but the aperture ratio is low and electroluminescent material is wasted
Solution Approach 1:
The pixel region is divided into a first region (covered by electronic elements) and a second region (not covered), with different cathode configurations in each region. This segmentation allows precise control of light emitting areas and prevents material waste in non-emitting zones.
Solution Approach 2:
Different regions of the pixel have different structures: the first region has a transparent first cathode for top emission, while the second region has a reflective second cathode for bottom emission. This local differentiation optimizes light emission efficiency and aperture ratio in each specific area.
2Area of stationary object
If a transparent first cathode and reflective second cathode are used to realize top and bottom emission, then the light emitting area and aperture ratio increase, but the device structure becomes more complex
Solution Approach 1:
The light emitting layer serves multiple functions by enabling both top emission (through the transparent first cathode in the first region) and bottom emission (through the reflective second cathode in the second region). This multi-functionality increases the effective light emitting area without requiring separate OLED structures.
Solution Approach 2:
The first and second cathodes are merged into a single cathode structure that performs both transparent and reflective functions in different regions. This integration achieves dual-sided emission while maintaining a unified device architecture, balancing complexity with functionality.
3Illumination intensity
If the aperture ratio is increased by optimizing light emission areas, then the brightness improves, but the manufacturing precision requirements increase
Solution Approach 1:
The pixel region is pre-divided into first and second regions before cathode deposition, with clear boundary definition. This preliminary segmentation ensures precise control of light emitting areas during subsequent manufacturing steps, meeting the precision requirements for high brightness performance.
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 design effectively increases the light emitting area and aperture ratio, enhancing the brightness and efficiency of OLED displays by allowing both top and bottom emission, thereby improving the overall display performance.
Implementation Method 1
OLED (Organic Light-Emitting Diode) display is a kind of all solid state, active light emitting display
Implementation Method 2
a reflective second cathode located over the first cathode and covering the second region
Data Source
AI summary
The embodiments of the present invention provide an OLED substrate, a manufacturing method thereof, an OLED display panel and an electronic equipment. The OLED substrate and the manufacturing method thereof provided by the embodiments of the present invention apply a transparent first cathode and a reflective second cathode, realizing top emitting and bottom emitting in a first region covered by electronic elements and a second region other than the first region respectively, increasing the light emitting area and the aperture ratio of pixels, thereby realizing double-sided display of OLED display device.