OLED Anode Concave-Convex Structure for Viewing Angle Uniformity
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Solution Overview
Problem
OLED display technology faces issues with color cast and luminance decay when viewed from different angles, particularly in curved screens, due to microcavity optics, which existing solutions struggle to address simultaneously and cost-effectively.
Innovation Solution
An OLED light-emitting unit with a top-emission substrate featuring a concave-convex structure formed on the second metal layer by thermal agglomeration, where the second metal layer is heated within a specific temperature and time range in an inert gas environment, enhancing diffuse reflection and reducing brightness differences across viewing angles without requiring additional scattering film layers or patterning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat anode surface is used in OLED, then the manufacturing process is simple, but color cast and luminance decay occur at large viewing angles
Solution Approach 1:
The patent applies surface curvature by forming a concave-convex structure on the anode surface through thermal treatment. This curved surface structure modifies light reflection paths, enabling light emitted at large viewing angles to be redirected toward the front, thereby reducing luminance decay and color cast without complicating the manufacturing process
2Illumination intensity
If a scattering film layer is added to reduce luminance decay, then viewing angle performance improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the anode function with the light scattering function by forming a concave-convex structure directly on the anode surface. This integration eliminates the need for a separate scattering film layer, reducing device complexity and manufacturing cost while maintaining the ability to reduce luminance decay and color cast at large viewing angles
3Illumination intensity
If thermal treatment is applied to form concave-convex structure, then light scattering improves, but process parameters must be precisely controlled
Solution Approach 1:
The patent utilizes parameter changes in thermal treatment (temperature, time, atmosphere) to transform the flat anode surface into a concave-convex structure. By optimizing these thermal parameters, the patent achieves effective light scattering while maintaining controllable manufacturing precision through established thermal processing techniques
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 concave-convex structure on the anode surface improves light scattering, reducing visual differences in brightness and color cast across various viewing angles, thereby enhancing the display's uniformity and reducing production costs by eliminating the need for separate scattering film layers and patterning processes.
Implementation Method 1
a thickness of the second metal layer is within a preset threshold range such that metal atoms of the second metal layer are capable of being thermally agglomerated and being rearranged under a preset condition to form a concave-convex structure on a surface of the second metal layer
Implementation Method 2
heating the second metal layer at a preset temperature for a preset time in an inert gas environment
Implementation Method 3
the concave-convex structure of the second metal layer causes a diffuse reflection effect of the light to occur, and under such diffuse reflection effect, light rays not from the front viewing angle are enhanced
Data Source
AI summary
The present application relates to an OLED light-emitting unit for use in a top-emission OLED substrate, which includes an anode, a cathode, and an organic functional layer arranged between the anode and the cathode. The anode includes a first metal layer and a second metal layer arranged in sequence, a separation layer is arranged between the first metal layer and the second metal layer, and a thickness of the second metal layer is within a preset threshold range such that metal atoms of the second metal layer are capable of being thermally agglomerated and rearranged under a preset condition to form a concave-convex structure on a surface of the second metal layer.