Optimizing OLED Subpixel Lifetimes with Electron Transport Layers
Here’s PatSnap Eureka !
Summary
Problems
In OLED displays, the lifetimes of red, green, and blue subpixels differ, leading to reduced luminance and color coordinate movement over time, as they age at varying rates.
Innovation solutions
The OLED display incorporates subpixels with organic light emitting layers that include at least two electron transport layers, with specific thicknesses for each color subpixel, ensuring equal or differing thicknesses to standardize their performance and extend lifespan.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a conventional OLED display uses red, green, and blue subpixels with standard organic light emitting layers, then the display can achieve white balance initially, but the lifetimes of the subpixels differ causing luminance reduction and color coordinate movement over time
Why choose this principle:
The patent applies different electron transport layer configurations to different color subpixels based on their specific lifetime characteristics. Red subpixels receive a first electron transport layer with specific properties, while green and blue subpixels receive a second electron transport layer with different properties. This local differentiation compensates for the inherent lifetime differences among color subpixels, enabling them to age at similar rates and maintain uniform luminance and color coordinates over time.
Principle concept:
If the OLED display uses different electron transport layer configurations for different color subpixels, then the lifetimes of subpixels are standardized and uniformity is improved, but the device structure becomes more complex
Why choose this principle:
The patent modifies specific parameters of the electron transport layers (such as material composition, thickness, or energy level characteristics) to optimize the lifetime of each color subpixel. By adjusting these parameters locally for red, green, and blue subpixels, the invention achieves uniform aging characteristics without fundamentally changing the overall OLED structure, thus balancing reliability improvement with acceptable device complexity.
Application Domain
Data Source
AI summary:
The OLED display incorporates subpixels with organic light emitting layers that include at least two electron transport layers, with specific thicknesses for each color subpixel, ensuring equal or differing thicknesses to standardize their performance and extend lifespan.
Abstract
An organic light emitting diode display is disclosed. The organic light emitting diode display includes a plurality of subpixels that emit light of at least three colors, the plurality of subpixels each including a first electrode, an organic light emitting layer, and a second electrode. Each of the organic light emitting layers of at least two of the plurality of subpixels includes at least two electron transport layers. The organic light emitting layer of at least one of the plurality of subpixels includes at least one electron transport layer.