OLED Display Panel Curved Region Anode Cathode Spacing
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Solution Overview
Problem
Flexible OLED display panels with curved edges experience significant changes in light intensity and wavelength when viewed from different angles due to microcavity effects, leading to color shifts that degrade the user's viewing experience.
Innovation Solution
The OLED display panel design features a light-emitting element in both flat and curved regions, with a greater distance between the anode and cathode in the curved region, and includes additional functional layers such as thickening layers or gratings to increase the cavity length, allowing a broader spectral range of light emission and reducing color shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the OLED display panel uses a curved edge design, then the display flexibility and modern aesthetic are improved, but the microcavity effect causes significant changes in light intensity and wavelength at different observation angles, resulting in color shifts that degrade viewing experience
Solution Approach 1:
The patent applies local quality by differentiating the functional layer thickness between curved and flat regions. The curved region has a greater distance between anode and cathode (thicker functional layers) compared to the flat region, creating locally optimized optical properties that compensate for the microcavity effect specific to curved geometries, thereby maintaining color consistency across different observation angles
Solution Approach 2:
The patent changes the critical parameter of functional layer thickness (distance between anode and cathode) to resolve the color shift issue. By increasing this distance in the curved region, the optical path length is extended, which compensates for the microcavity effect and maintains consistent light emission characteristics across varying observation angles
2Illumination intensity
If the distance between anode and cathode is increased in the curved region, then the spectral range is broadened and color shifts are reduced, but the device complexity and manufacturing difficulty increase due to region-specific structural modifications
Solution Approach 1:
The patent segments the display panel into distinct curved and flat regions, each with optimized light-emitting element structures. This segmentation allows independent optimization of the functional layer thickness in each region, enabling the curved region to have enhanced thickness for spectral consistency while the flat region maintains standard thickness, thus managing device complexity through regional differentiation
3Manufacturing precision
If additional thickening layers or gratings are added to the curved region, then the cavity length is increased to reduce color shifts, but the manufacturing process complexity increases due to multiple patterning and deposition steps
Solution Approach 1:
The patent incorporates thickening layers directly into the functional layer formation process during manufacturing, rather than adding them as separate post-processing steps. This preliminary integration of the thickening function into the existing deposition process reduces manufacturing complexity while achieving precise control over the cavity length in the curved region
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 enhances the display performance of curved regions by maintaining a consistent spectral range across different observation angles, minimizing color shifts and improving the overall viewing experience.
Implementation Method 1
there are different levels of microcavity effects in the light-emitting elements of an OLED display panel. With the microcavity effect, the densities of photon of different energy levels are redistributed, so that only light of a specific wavelength that conforms to a resonant cavity mode may be emitted out at a specific angle
Data Source
AI summary
An OLED display panel, a method for manufacturing the same and an OLED display device are disclosed. The OLED display panel comprises a flat region and a curved region, wherein the OLED display panel comprises a light-emitting element in the flat region and a light-emitting element in the curved region, each light-emitting element comprises a cathode and an anode, and a distance between the anode and the cathode of the light-emitting element in the curved region is greater than a distance between the anode and the cathode of the light-emitting element in the flat region.