OLED Panel Anode Segmentation for Luminance and Color
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices with bottom emission structures face challenges in securing desired color coordinates and viewing angle characteristics due to limitations in adjusting the reflection and transmission characteristics of the anode, particularly with the use of ITO and micro-cavity structures, which degrade luminance and color difference performance.
Innovation Solution
The implementation of an organic light emitting display device with a panel configuration that includes both OLEDs with a cavity anode formed of multiple conductive materials and OLEDs with a transparent anode formed of a single conductive material, allowing for spatial separation and different structural configurations to enhance luminance and color difference characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a three-layer anode structure (ITO/Ag/ITO) with micro-cavity is used, then color characteristics are enhanced, but luminance viewing angle is narrowed and color difference characteristic is degraded
Solution Approach 1:
The display device segments the anode structure into two distinct types: a first anode with a three-layer structure (ITO/Ag/ITO) for enhanced color characteristics, and a second anode with a single-layer transparent structure for wide viewing angle performance. This segmentation allows each sub-pixel to be optimized independently for its specific function.
Solution Approach 2:
Different anode structures are applied to different sub-pixels based on their specific requirements. The first anode (ITO/Ag/ITO) is used where color enhancement is needed, while the second anode (transparent ITO) is used where wide viewing angle is prioritized. This local quality approach ensures optimal performance in each region.
2Illumination intensity
If a three-layer anode structure (ITO/Ag/ITO) with micro-cavity is used, then color characteristics are enhanced, but color difference characteristic is degraded
Solution Approach 1:
The display device segments the anode structure into two distinct types: a first anode with a three-layer structure (ITO/Ag/ITO) for enhanced color characteristics, and a second anode with a single-layer transparent structure for wide viewing angle performance. This segmentation allows each sub-pixel to be optimized independently for its specific function.
Solution Approach 2:
Different anode structures are applied to different sub-pixels based on their specific requirements. The first anode (ITO/Ag/ITO) is used where color enhancement is needed, while the second anode (transparent ITO) is used where wide viewing angle is prioritized. This local quality approach ensures optimal performance in each region.
3Ease of manufacture
If ITO is used as anode material, then transparent substrate can be used, but desired color coordinates cannot be secured
Solution Approach 1:
The display device segments the anode structure into two distinct types: a first anode with a three-layer structure (ITO/Ag/ITO) for enhanced color characteristics, and a second anode with a single-layer transparent structure for wide viewing angle performance. This segmentation allows each sub-pixel to be optimized independently for its specific function.
Solution Approach 2:
The first anode uses a composite structure of ITO/Ag/ITO, combining the transparency and flexibility of ITO with the reflective and conductive properties of Ag. This composite material approach enables both transparent substrate compatibility and enhanced color coordinate 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 approach enables improved luminance and color difference characteristics across various viewing angles, facilitating easier adjustment and optimization of these parameters, thereby enhancing the overall performance of the display device.
Implementation Method 1
an anode is formed in a three-layer structure including ITO/Ag/ITO. The OLED, having a structure which is as illustrated in FIG. 2(b), uses a micro-cavity. A method using the micro-cavity is disclosed in references
Implementation Method 2
an organic emission layer which includes a hole injection layer (HIL), a hole transport layer (HTL), an emission material layer (EML), and an electron transport layer (ETL)
Data Source
AI summary
Discussed is an organic light emitting display device. An OLED including a transparent anode formed of one conductive transparent material and an organic light emitting diode (OLED) including a cavity anode formed of a plurality of conductive materials are provided in one panel.