Double-Sided OLED Panel with Inverted Structure for Voltage Drop Reduction
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Solution Overview
Problem
OLED manufacturers aim to maximize the characteristics of organic light emitting diodes (OLEDs) to create more attractive products, particularly in achieving high-resolution and ultra-thin display solutions while minimizing voltage drop and panel thickness.
Innovation Solution
A double-sided display panel is developed with both bottom emission and top emission structures on a single thin film transistor (TFT) substrate, combining active matrix and passive matrix OLED driving structures, and utilizing an inverted OLED device structure to reduce voltage drop, with a thin film transistor array, anodes, and cathodes made of specific materials to maintain panel thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double-sided display panel combines both bottom emission and top emission structures on a single TFT substrate, then high-resolution performance and basic display performance are achieved on opposite sides, but the device structure becomes more complex
Solution Approach 1:
The patent combines both bottom emission and top emission OLED structures on a single TFT substrate, integrating two different display modes (AMOLED and PMOLED) into one device. This merging approach enables dual-sided display functionality while sharing common components like the TFT array and substrate, thereby achieving versatility without proportionally increasing complexity
Solution Approach 2:
The single TFT substrate serves multiple functions by supporting both bottom emission and top emission OLED structures. The same substrate and TFT array are used to drive two different display modes, making the device multi-functional and enabling it to perform both high-resolution and basic display tasks on opposite sides
2Reliability
If an inverted OLED device structure is used on the top emission side, then voltage drop (IR-drop) is effectively reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs an inverted OLED structure on the top emission side, where the conventional order of layers is reversed. Specifically, the cathode is positioned closer to the TFT substrate while the anode is positioned farther away, opposite to the conventional structure. This inversion optimizes the electrical field distribution and reduces voltage drop (IR-drop) across the device, improving reliability despite adding manufacturing complexity
3Length of stationary object
If thin film transistor array and thin film encapsulation structure are used, then panel thickness is reduced to achieve ultra-thin display, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes thin film encapsulation structures and thin film transistor arrays to achieve ultra-thin panel thickness. By replacing traditional thick encapsulation methods with thin film alternatives, the overall panel thickness is significantly reduced while maintaining protective and functional requirements, though this demands higher precision in film deposition and control processes
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
The solution enables high-resolution performance on one side and basic display performance on another, reduces voltage drop, and maintains ultra-thin panel thickness by using a combination of active and passive matrix OLEDs with inverted structures, facilitating mass production and operational convenience.
Implementation Method 1
Organic light emitting diodes (OLEDs) have self-illumination, high brightness, wide viewing angles, high contrast, flexibility, low energy consumption, etc.
Implementation Method 2
forming the first organic layer and the first cathode on the first organic layer by vacuum evaporation or solution film formation on the first anode and the thin film transistor
Implementation Method 3
forming the interlayer insulating layer by chemical vapor deposition on the first cathode
Implementation Method 4
forming the second anode by vacuum sputtering
Data Source
AI summary
A double-sided display panel and a method of fabricating the same are provided. The double-sided display panel is an organic light emitting diode (OLED) device with two structures of bottom emission and top emission on a single thin film transistor (TFT) substrate. An OLED display mode combines two different driving structures of active matrix organic light emitting diodes and passive matrix organic light emitting diodes, such that an OLED display realizes double-sided display performance, and has a high-resolution performance on one side and a basic display performance on another side.