OLED Curved Light Emitter Reduces Current Density
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Solution Overview
Problem
Organic light emitting diode (OLED) devices have shorter service lives due to higher current density, which affects user experience, and increasing the aperture ratio to reduce current density lowers product yield.
Innovation Solution
An organic light emitting diode device with a non-planar light emitting component and a first structural layer on a substrate, where the light emitting surface area is larger than its orthographic projection, reducing current density while maintaining the pixel aperture ratio, thereby improving the OLED's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the aperture ratio is increased to reduce current density, then the OLED lifetime is improved, but the product yield decreases
Solution Approach 1:
The patent transitions from a planar light emitting surface to a three-dimensional convex curved surface structure. By changing the surface topology from 2D to 3D, the light emitting area is expanded without increasing the planar footprint, thus maintaining the same aperture ratio while providing larger emitting area to reduce current density and extend OLED lifetime.
Solution Approach 2:
The light emitting surface is designed with a convex curved shape (spherical or ellipsoidal) instead of a flat plane. This curvature increases the surface area relative to the base area, allowing more light emission from the same pixel area, thereby reducing current density without compromising yield.
2Illumination intensity
If the current density is increased to maintain brightness, then the brightness is maintained, but the OLED lifetime shortens
Solution Approach 1:
By creating a convex curved surface structure, the patent increases the light emitting area in the vertical dimension without expanding the planar area. This allows the same brightness output to be achieved with lower current density distributed over a larger surface area, thus extending service life while maintaining illumination intensity.
3Reliability
If the light emitting surface area is increased to reduce current density, then the OLED lifetime is extended, but the pixel aperture ratio is reduced
Solution Approach 1:
The patent resolves this contradiction by increasing the light emitting area in the vertical dimension through convex curvature rather than horizontal expansion. The light emitting surface area becomes larger than the orthographic projection area, allowing extended lifetime through reduced current density while maintaining the same aperture ratio as defined by the planar projection.
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 increases the OLED's lifetime by reducing current density without compromising product yield, as demonstrated by experimental data showing extended brightness retention over time.
Implementation Method 1
Organic light emitting diode (OLED) device, in which organic materials emit light under an electric field
Data Source
AI summary
The present disclosure provides an organic light emitting diode device and a manufacturing method thereof, a display panel and a display device. The organic light emitting diode device includes: a substrate; and a light emitting component and a first structural layer provided on a side of the substrate, wherein the light emitting component is provided on a side of the first structural layer distal to the substrate, and a light emitting surface of the light emitting component comprises a curved surface recessed towards the substrate, and the curved surface comprises a spherical-cap curved surface or a concave-convex curved surface which is constituted by a plurality of spherical-cap curved surfaces.