Dual Barrier Ribs for OLED Deposition Accuracy
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Solution Overview
Problem
The conventional method of forming an organic light-emitting layer in organic electro-luminescence displays using a shadow mask often results in inaccurate deposition of organic materials, leading to mixing of different colors and improper amounts, which causes non-uniformity and deterioration of picture quality.
Innovation Solution
The use of a first barrier rib with a backward taper structure and a second barrier rib with a forward taper structure, positioned between adjacent organic electro-luminescence cells, ensures accurate placement of the organic light-emitting layer by preventing the organic material from spreading to adjacent sub-pixels, thereby maintaining color purity and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a shadow mask is used to form the organic light-emitting layer, then the deposition process can be completed, but the organic material spreads to adjacent sub-pixels causing color mixing and non-uniformity
Solution Approach 1:
The patent introduces a dual-layer barrier rib structure with first barrier ribs extending in a first direction and second barrier ribs extending in a second direction perpendicular to the first direction. This segmentation creates multiple directional constraints that prevent organic material from spreading to adjacent sub-pixels, thereby resolving the contradiction between ease of deposition and placement accuracy.
Solution Approach 2:
The barrier ribs serve as intermediary structures between the shadow mask and the sub-pixels. These ribs physically block and contain the organic material within designated areas during deposition, preventing unwanted spreading while allowing the shadow mask to function effectively.
2Manufacturing precision
If barrier ribs are added to prevent material spreading, then placement accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges the barrier rib structure with the existing insulating film and substrate integration. The first and second barrier ribs are formed as part of the same device architecture, sharing common support structures and fabrication processes, which reduces the overall complexity increase despite adding functional elements.
Solution Approach 2:
The barrier ribs serve multiple functions: they provide mechanical support, define pixel boundaries, prevent material spreading, and guide organic layer formation. This multi-functionality reduces the need for additional separate structures, thereby limiting the increase in device complexity while achieving improved placement accuracy.
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 approach effectively prevents the organic light-emitting layer from being deposited inaccurately, ensuring precise placement and preventing picture quality issues such as non-uniformity, thereby enhancing the overall display quality.
Implementation Method 1
The organic ELD has an advantage in that it can be driven with a lower voltage than the inorganic ELD because electrons and holes emit a light while being extinguished after making a pair when electric charges are injected into an organic EL layer
Data Source
AI summary
An organic electro-luminescence device and a fabricating method thereof wherein an organic light-emitting layer can be provided at an accurate location to prevent a deterioration of picture quality. In the organic electro-luminescence device, a first barrier rib is provided between adjacent organic electro-luminescence cells along a first direction. A second barrier rib is provided between said adjacent organic electro-luminescence cells along a second direction and is positioned between the first barrier ribs.