OLED Pixel Oblique Sub-pixel Layout for Blue Degradation
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Solution Overview
Problem
Active matrix OLED display panels face significant color casts and reduced service life due to high degradation rates of blue sub-pixels, which affects the overall service life and aperture ratio of the display panel.
Innovation Solution
The arrangement of red, green, and blue sub-pixels in an oblique configuration with the blue sub-pixel being the longest, maintaining the same width as the others, increases the opening area of the blue sub-pixel, reducing current density and degradation rate without reducing the total aperture ratio, thereby prolonging the service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blue sub-pixel is made longer to increase its opening area and reduce current density, then the service life is improved, but the pixel layout complexity increases
Solution Approach 1:
The patent applies asymmetry by making the blue sub-pixel longer than the red and green sub-pixels. This asymmetric design increases the opening area of the blue sub-pixel, thereby reducing current density and degradation rate, which directly improves service life while accepting increased layout complexity as a necessary trade-off
Solution Approach 2:
The patent applies local quality by giving the blue sub-pixel different dimensions (longer length) compared to the red and green sub-pixels. This localized modification targets the specific problem of blue sub-pixel degradation by adjusting only the blue sub-pixel's geometry to reduce its current density, while maintaining standard dimensions for other sub-pixels
2Reliability
If the blue sub-pixel opening area is increased to reduce current density, then the degradation rate is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The asymmetric design of the blue sub-pixel with greater length creates a larger opening area that naturally reduces current density. This geometric modification addresses the degradation rate issue while the precision requirements are managed through standard fabrication processes applied to the asymmetric pattern
Solution Approach 2:
The patent changes the geometric parameters of the blue sub-pixel by increasing its length dimension. This parameter modification increases the opening area and reduces current density, thereby lowering the degradation rate. The manufacturing precision is maintained within acceptable ranges for display fabrication
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 configuration effectively prolongs the service life of the display panel by reducing blue sub-pixel degradation while maintaining the total aperture ratio, enhancing display quality and reducing energy consumption.
Implementation Method 1
The organic light emitting layer is driven by an applied electric field and gives rise to a luminescence phenomenon through injection and recombination of carriers from the anode and the cathode respectively
Data Source
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AI summary
An organic light emitting diode display pixel (100), a display panel and a display device are provided. The organic light emitting diode display pixel (100) comprises a red light emitting device (10), a green light emitting device (20) and a blue light emitting device (30) arranged side by side and disposed oblique with respect to a border of the pixel. The red light emitting device (10) and the green light emitting device (20) are located on both sides of the blue light emitting device (30), which has a length larger than those of the red one (10) and the green one (20). The display pixel can prolong the service life of a display panel without reducing the total aperture ratio of pixels.