OLED Pixel Structure with Arc-Shaped Electrodes for Wide Viewing Angle
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Solution Overview
Problem
Top emission OLED pixel structures suffer from a microcavity effect, resulting in a narrow angle of view and variations in light strength and color when viewed from different angles due to interference between reflective and translucent metal electrodes.
Innovation Solution
An OLED pixel structure is designed with an intermediate layer having an arc-shaped recess on its surface, where the first electrode, organic material functional layer, and second electrode each have corresponding arc shapes, enhancing light interference and emission directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a top emission OLED pixel structure with planar electrodes is used, then the manufacturing process is simple, but the angle of view is narrow and light uniformity deteriorates due to microcavity effect
Solution Approach 1:
The patent applies curvature by forming the first and second electrodes with arc-shaped surfaces instead of planar surfaces. The first electrode has an arc surface facing the second electrode, and the second electrode has a corresponding arc surface, creating a curved optical cavity that eliminates the microcavity effect and improves light emission uniformity across different viewing angles
2Device complexity
If a top emission OLED pixel structure with planar electrodes is used, then the device structure is simple, but light strength and color uniformity deteriorates due to interference between electrodes
Solution Approach 1:
The curved arc surfaces of the electrodes modify the optical path and interference patterns of photons between electrodes. This curvature distributes light emission more uniformly across different angles, stabilizing the light strength and color composition regardless of viewing angle
3Ease of manufacture
If planar electrodes are used in OLED pixel structure, then the fabrication process is straightforward, but viewing angle performance is limited
Solution Approach 1:
The arc-shaped electrode surfaces are formed through a multi-step fabrication process involving coating, drying, and heat treatment. This curvature transformation maintains manufacturability while dramatically improving illumination intensity distribution across different viewing angles by eliminating directional interference patterns
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 configuration increases the angle of view and improves the uniformity of light strength and color across different viewing angles by optimizing photon beam interference between electrodes.
Implementation Method 1
interference among multiple photon beams between the two electrodes so as to achieve a greater microcavity effect
Implementation Method 2
photon densities at different energy states are reallocated such that light with certain wavelength will be emitted at certain angle once it conforms to a resonant cavity mode
Data Source
AI summary
Embodiments of the present disclosure relate to an OLED pixel structure and a method for manufacturing the same, an OLED display panel having the OLED pixel structure, and an OLED display device having the OLED display panel. An OLED pixel structure comprises a plurality of sub-pixel units. Each of said sub-pixel units comprises: a first electrode, an organic material functional layer and a second electrode arranged in that order on said substrate plate; and an intermediate layer arranged between said substrate plate and said first electrode; wherein, a surface of said intermediate layer away from said substrate plate has a recess of arc shape; and said first electrode is located within said recess such that said first electrode, said organic material functional layer and said second electrode each has an arc shape corresponding to the arc shape of said recess. With these technical solutions according to the present disclosure, these problems of the narrow angle of view, and of different strengths and colors of the light as being viewed from different viewing angles, can be alleviated.