Curved Lower Organic Layer for Wide Viewing Angle Displays
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Solution Overview
Problem
Display apparatuses face a trade-off between high emission efficiency and wide luminance viewing angle, with deposition processes offering high efficiency but narrow viewing angles, and solution processes providing wide viewing angles but lower efficiency.
Innovation Solution
A display apparatus with a lower organic layer having a cross-sectional profile of curved surfaces, allowing a light emitting layer with constant thickness to be formed on top, creating a multi-cavity effect that enhances luminance viewing angle while maintaining high emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light emitting layer is formed by a deposition process, then emission efficiency is improved, but luminance viewing angle deteriorates
Solution Approach 1:
The lower organic layer is designed with a curved cross-sectional profile instead of a flat surface. This curvature creates a multi-cavity effect that widens the luminance viewing angle while maintaining the deposition process for high emission efficiency. The curved profile allows light to be emitted at wider angles without sacrificing the efficiency benefits of deposition formation.
Solution Approach 2:
The invention transitions from a two-dimensional flat layer structure to a three-dimensional curved layer structure. By introducing vertical curvature in the lower organic layer, the patent achieves both high emission efficiency (from deposition) and wide viewing angle (from the curved profile creating multiple light emission paths).
2Adaptability or versatility
If the light emitting layer is formed by a solution process, then luminance viewing angle is improved, but emission efficiency deteriorates
Solution Approach 1:
The curved cross-sectional profile of the lower organic layer creates a multi-cavity effect that inherently widens the luminance viewing angle, achieving the viewing angle benefits previously associated with solution processes. Simultaneously, the light emitting layer itself is formed by deposition to maintain high emission efficiency.
3Ease of manufacture
If the lower organic layer has a flat surface, then manufacturing simplicity is maintained, but luminance viewing angle deteriorates
Solution Approach 1:
The lower organic layer is formed with a curved cross-sectional profile that can be achieved through controlled deposition processes. This curvature creates the multi-cavity effect for wide viewing angles while remaining compatible with existing deposition manufacturing techniques, thus maintaining ease of manufacture.
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 achieves a balance by maintaining high emission efficiency while significantly improving luminance viewing angle through the use of a lower organic layer with curved surfaces, enhancing the display's overall performance.
Implementation Method 1
since layers between an anode and a cathode have a change in thickness, a multi-cavity effect is provided, so an effect of increasing a luminance viewing angle is provided
Implementation Method 2
The light emitting layer having a non-flat profile may be formed on an upper portion of the organic layer by a deposition process
Data Source
AI summary
A display apparatus includes a substrate, a first electrode disposed on the substrate, a lower organic layer disposed on the first electrode, a light emitting layer disposed on the lower organic layer, and a second electrode disposed on the light emitting layer. The lower organic layer has a cross-sectional profile including a plurality of curved surfaces.