AMOLED Blue OLED Lifetime via Recess Contact Area
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Solution Overview
Problem
The lifetime of blue organic light emitting diodes in active matrix OLED panels is shorter due to higher current density, leading to a compromise in resolution when attempting to prolong their service life by increasing their area, which in turn reduces the overall panel resolution.
Innovation Solution
Forming a recess or protrusion in the organic film corresponding to the blue organic light emitting diode with a larger surface area than the red or green organic light emitting diode, allowing for an increased contact area without expanding the pixel size, thus reducing current density and prolonging the blue organic light emitting diode's lifetime without compromising resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the area of blue organic light emitting diode is increased to reduce current density and prolong lifetime, then the lifetime of blue organic light emitting diode is improved, but the area of the whole pixel tube is increased causing the resolution of the AMOLED panel to be reduced
Solution Approach 1:
The patent applies local quality by creating a recess structure specifically in the blue organic light emitting diode region, giving it a different geometric configuration compared to red and green diodes. This localized structural modification increases the contact area between the blue diode and organic film without affecting other pixels, thereby reducing current density in the blue diode while maintaining overall pixel dimensions and panel resolution.
Solution Approach 2:
The patent utilizes vertical dimensionality by forming a recess (depression) in the organic film layer. This introduces a depth component to the contact area, allowing the blue diode to have a larger effective contact area through vertical space utilization rather than horizontal expansion. The recess structure creates additional surface area in the vertical dimension, enabling current density reduction without increasing the planar footprint of the pixel.
2Duration of action of stationary object
If the current density of blue organic light emitting diode is reduced to prolong its lifetime, then the lifetime is improved, but the area of the blue organic light emitting diode must be increased which compromises the pixel area and resolution
Solution Approach 1:
The patent resolves this contradiction by transitioning from a two-dimensional planar contact area to a three-dimensional contact area through recess formation. The vertical depth of the recess provides additional contact area without increasing the horizontal pixel dimensions. This dimensional transition allows the blue diode to achieve lower current density through increased contact area while maintaining the same pixel tube area and thus preserving panel resolution.
Solution Approach 2:
The recess structure is applied locally only to the blue organic light emitting diode region, creating a differentiated geometric configuration. This localized modification enables the blue diode to have a larger contact area specifically where needed, without affecting the area allocation of red and green diodes or the overall pixel dimensions, thereby maintaining pixel tube area and resolution while reducing current density in the blue diode.
Data Source
AI summary
The disclosure discloses an active matrix organic light emitting diode panel and a method for manufacturing the same. The active matrix organic light emitting diode panel includes: a substrate, an organic film formed on the substrate, and a plurality of red, green and blue organic light emitting diodes formed on the organic film. A first recess or a first protrusion is formed in the organic film in a region corresponding to the blue organic light emitting diode. The blue organic light emitting diode is formed on the first recess or first protrusion, and a contact area of the blue organic light emitting diode with the organic film isSr0Lifetimeb0Lifetimer0ntimes as great as a contact area of the red organic light emitting film with the organic film, wherein n is a value ranging from 1.4 to 1.6.