OLED Blue Sub-Pixel Cathode Layout for Higher PPI Stability
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Solution Overview
Problem
The low light-emitting efficiency and short lifetime of blue sub-pixels in OLED displays require larger pixel sizes, leading to a low pixels per inch (PPI) and reduced image definition.
Innovation Solution
A compensation cathode is disposed opposite to the blue sub-pixel, increasing cathode thickness and reducing resistance, thereby enhancing electric field strength and stability, allowing for a reduction in pixel size and enabling a more efficient display panel design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blue sub-pixel size is increased to compensate for low light-emitting efficiency and short lifetime, then the light emission stability is improved, but the pixels per inch (PPI) decreases
Solution Approach 1:
The patent introduces a compensation cathode in the stacking direction (vertical dimension) to compensate for the insufficient light emission of blue sub-pixels. This vertical compensation approach allows the blue sub-pixel to maintain its original planar size while achieving improved light emission stability, thereby resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent changes the electrical parameters by introducing a compensation cathode that can independently control the cathode voltage for blue sub-pixels. This parameter adjustment enables precise control of electron injection and recombination efficiency, improving light emission stability without requiring larger pixel areas, thus maintaining high PPI.
2Duration of action of stationary object
If the blue sub-pixel area is increased to extend lifetime, then the light-emitting efficiency is improved, but the display resolution decreases
Solution Approach 1:
The patent addresses the lifetime issue by adding a compensation cathode in the vertical stacking direction rather than increasing the horizontal area of blue sub-pixels. This dimensional approach extends the functional capability without compromising the pixel density and display resolution.
Solution Approach 2:
The compensation cathode enables dynamic adjustment of cathode voltage parameters for blue sub-pixels, optimizing electron injection efficiency and reducing operational stress. This parameter optimization extends the operational lifetime of blue sub-pixels while maintaining their original small size and high-resolution layout.
3Illumination intensity
If a combined RGB pixel occupies larger area to accommodate blue sub-pixel requirements, then the light emission performance is improved, but the pixels per inch (PPI) decreases
Solution Approach 1:
The patent resolves this contradiction by moving the compensation mechanism from the horizontal plane to the vertical stacking direction. The compensation cathode is positioned in the third dimension (stacking direction), allowing enhanced light emission performance for blue sub-pixels without increasing the horizontal footprint of the RGB pixel, thus maintaining high PPI.
Solution Approach 2:
The introduction of the compensation cathode enables independent voltage control for blue sub-pixel cathodes, optimizing electron injection and recombination parameters. This parameter optimization improves light emission intensity and efficiency without requiring larger pixel areas, preserving the high-density pixel layout.
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 increases PPI, improving image definition and resolution by accommodating more pixels within the same area while maintaining stable light emission.
Implementation Method 1
increasing cathode thickness and reducing resistance
Implementation Method 2
enhancing electric field strength and stability
Data Source
AI summary
A display panel and a driving method thereof, and a display apparatus are provided. The display panel includes a cathode layer, a blue sub-pixel, and a compensation cathode. The blue sub-pixel is stacked on the cathode layer, and the compensation cathode is disposed on one side of the cathode layer facing away from the blue sub-pixel. The compensation cathode and the blue sub-pixel are disposed opposite to each other in a first direction, and the first direction is a stacking direction of the blue sub-pixel and the cathode layer.