AMOLED Blue OLED Lifetime via Vertical Relief Structures
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Solution Overview
Problem
The lifetime of blue organic light emitting diodes in active matrix organic light emitting diode (AMOLED) panels is shorter due to higher current density, leading to a compromised resolution when attempting to prolong their service life by increasing their area.
Innovation Solution
Forming recesses or protrusions in the organic film to increase the surface area of blue organic light emitting diodes without altering the resolution, thereby reducing current density and extending their lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the area of the blue organic light emitting diode is increased to reduce current density and prolong lifetime, then the service life of the AMOLED is improved, but the area of the whole pixel tube is increased causing the resolution to be reduced
Solution Approach 1:
The patent introduces a vertical dimension by forming recesses or protrusions in the organic film beneath the blue OLED. This allows the blue OLED to have a larger surface area (improving lifetime) while maintaining the same pixel aperture area (preserving resolution). The vertical relief structure enables the blue OLED to contact the substrate over a larger area without increasing the horizontal pixel footprint.
Solution Approach 2:
The patent applies local quality by creating a non-uniform organic film structure specifically beneath the blue OLED region. The recesses or protrusions are formed only in the blue OLED area, giving it a larger effective area for current distribution while other colors (red and green) maintain their original flat structure and area. This localized modification allows selective optimization of the blue OLED without affecting other subpixels.
2Reliability
If the area of the blue organic light emitting diode is increased to prolong lifetime, then the current density is reduced, but the pixel tube area is increased compromising resolution
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension through recesses or protrusions in the organic film. The blue OLED's contact area with the substrate is increased via this vertical relief structure, allowing larger effective area for reduced current density and improved reliability, while the horizontal pixel aperture remains unchanged to maintain resolution.
Solution Approach 2:
The patent employs curved surfaces (spheroidality) by forming hemispherical or arc-shaped recesses or protrusions in the organic film. This curved geometry increases the surface area of the blue OLED contact region compared to a flat structure, enabling larger area for current distribution while fitting within the same horizontal pixel boundaries, thus improving lifetime without compromising pixel area.
Data Source
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AI summary
The invention discloses an active matrix organic light emitting diode panel (200) and a method for manufacturing the same. The active matrix organic light emitting diode panel includes: a substrate (201), an organic film (204) formed on the substrate, and a plurality of red (2081), green (2082) and blue organic light emitting diodes (2083) formed on the organic film. A recess (207) or protrusion is formed in the organic film in a region corresponding to the blue organic light emitting diode (2083). The blue organic light emitting diode is formed on the recess or protrusion, and the surface area of the recess or protrusion is larger than the area of the surface where the red (2081) or green organic light emitting diodes (2082) contacts the organic film.