OLED Cathode with Gaps for Light Extraction
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Solution Overview
Problem
Existing OLED display panels have a low light extracting rate and display color changes significantly with different viewing angles due to the strong light absorption and reflection of the metal cathode formed as a whole layer.
Innovation Solution
The OLED display panel incorporates a cathode with gaps to improve light transmittance, featuring cathode units arranged at intervals corresponding to subpixels, with the gaps allowing direct light transmission and reducing absorption and reflection, thereby enhancing the light extracting rate and minimizing color shift with viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a whole-layer metal cathode is used, then the cathode provides strong light reflection and absorption, but the light extracting rate becomes very low
Solution Approach 1:
The cathode is divided into multiple cathode units arranged in a matrix pattern, with gaps between adjacent units. This segmentation allows light to pass through the gaps rather than being fully absorbed or reflected by a continuous metal layer, thereby improving the light extracting rate while maintaining the cathode's electrical function.
2Stability of the object's composition
If a whole-layer metal cathode is used, then the cathode provides strong light reflection, but a micro-cavity effect is formed causing display color to change with viewing angles
Solution Approach 1:
By segmenting the cathode into discrete units with gaps, the continuous reflective surface that creates micro-cavity effects is broken up. This prevents the formation of resonant cavities that cause viewing angle-dependent color shifts, stabilizing the display color across different viewing angles.
3Illumination intensity
If a whole-layer metal cathode is used, then the cathode structure is simple, but the light transmittance is poor
Solution Approach 1:
The cathode is segmented into multiple units with gaps, which improves light transmittance by allowing light to pass through the non-metallic regions. The matrix arrangement of cathode units maintains relative structural simplicity while achieving better optical performance compared to a continuous layer.
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 significantly improves the light extracting rate and stabilizes display color across various viewing angles by reducing light absorption and reflection, addressing the limitations of the traditional whole-layer metal cathode.
Implementation Method 1
the gaps allowing direct light transmission and reducing absorption and reflection
Implementation Method 2
reducing absorption and reflection
Implementation Method 3
reducing absorption and reflection
Data Source
AI summary
The present disclosure provides an OLED display panel, a manufacturing method thereof and a mask plate. The OLED display panel includes an emitting layer and a cathode located at a light-exiting side of the emitting layer. The cathode is provided with gaps. Light emitted from the emitting layer may directly transmit through positions corresponding to the gaps, and then the cathode may have a decreased absorption and reflection against light emitted from the emitting layer as comparing with a cathode formed as a whole layer in the related art, thereby improving the light extracting rate of the OLED display panel, weakening the micro-cavity effect and solving the problem that the display color of the OLED display panel changes with different viewing angles.