2-Stack OLED With Transition Metal Oxide Layer
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Solution Overview
Problem
Existing organic light emitting display (OLED) devices face limitations in efficiency, power consumption, and color coordinate adjustment due to their 1-stack structure, and the vulnerability of electron transportation and injection layers to moisture, which affects their lifespan and efficiency when exposed to normal pressure after vacuum-deposition.
Innovation Solution
A 2-stack hybrid OLED device structure is implemented, featuring a transition metal oxide layer as a charge generation and passivation layer, allowing for a soluble process under normal pressure, enhancing efficiency and power consumption characteristics by forming an N-type charge generation layer and a second stack with specific light emitting layers and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a 1-stack soluble hybrid OLED device structure is used, then the device can be manufactured with a simpler structure, but the efficiency, power consumption, and color coordinate adjustment are limited
Solution Approach 1:
The OLED device is divided into two separate stacks: a first stack including the anode, hole injection layer, hole transportation layer, and emission layer; and a second stack including the electron injection layer, electron transportation layer, and cathode. This segmentation allows each stack to be optimized independently for its specific function, resolving the contradiction between structural simplicity and manufacturing efficiency.
2Ease of manufacture
If the electron injection layer is vacuum-deposited and then exposed to normal pressure for soluble process, then the soluble process can be performed, but the element is damaged and efficiency and lifespan are negatively affected
Solution Approach 1:
The device is segmented into two stacks with the first stack (including emission layer) completed before vacuum-deposition of the second stack. This allows the soluble process to be performed on the first stack without exposing previously deposited layers to moisture and oxygen, preventing element damage while maintaining manufacturing ease.
Solution Approach 2:
The first stack is fully formed and sealed with its emission layer before the second stack is vacuum-deposited. This preliminary action protects the soluble-process layers from subsequent exposure to normal pressure conditions, preventing element damage while allowing the soluble process to be performed.
3Use of energy by moving object
If a 2-stack white OLED device with color filters is used, then power consumption and luminance are improved, but efficiency loss due to color filters and color shift according to driving occur
Solution Approach 1:
Different light emitting layers are positioned in specific regions (first light emitting layer for first color, second light emitting layer for second color, third light emitting layer for third color) to emit different colors directly without requiring color filters. This local quality approach eliminates the efficiency loss associated with color filters while maintaining improved power consumption characteristics.
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 2-stack structure with a transition metal oxide layer improves OLED device efficiency, power consumption, and color coordinate characteristics, enabling the manufacture of hybrid OLED devices with increased luminous efficiency and reduced driving voltage, while maintaining performance under normal pressure atmospheres.
Implementation Method 1
A 2-stack hybrid OLED device structure is implemented, featuring a transition metal oxide layer as a charge generation and passivation layer
Implementation Method 2
A 2-stack hybrid OLED device structure is implemented, featuring a transition metal oxide layer as a charge generation and passivation layer
Implementation Method 3
An organic light emitting display (OLED) device is an electronic device emitting light in response to a potential applied thereto
Data Source
AI summary
An organic light emitting display (OLED) device can include a substrate on which first to third light emitting portions are defined, first electrodes respectively positioned on the first to third light emitting portions, a first stack formed on the first electrodes and including first, second and third light emitting layers corresponding to the first, second and third light emitting portions, respectively, an N-type charge generation layer (CGL) positioned on the first stack, a transition metal oxide layer positioned on the N-type CGL, a second stack positioned on the transition metal oxide layer and including fourth, fifth and sixth light emitting layers corresponding to the first, second and third light emitting portions, respectively, and a second electrode positioned on the second stack.