OLED Pixel Structure Curved Electrodes for Viewing Angle Consistency
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Solution Overview
Problem
Conventional OLED display panels exhibit color shift and differences in brightness when viewed from different angles due to varying path lengths of emitted light passing through the OLED light-emitting layer and transparent electrode layer.
Innovation Solution
The OLED pixel structure features a three-dimensional concave curved shape for the pixel electrodes and light-emitting layer, with the pixel definition layer formed prior to the electrodes, ensuring a consistent path length for emitted light across angles, reducing color shift and brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar pixel design is used, then the manufacturing process is simple, but color shift and brightness differences occur at different viewing angles
Solution Approach 1:
The patent applies curvature by forming the pixel electrodes and light-emitting layer with a three-dimensional concave curved shape instead of a planar configuration. This curvature design ensures that light emitted at different angles travels through a consistent path length, thereby eliminating color shift and brightness differences while maintaining manufacturing feasibility through existing thin-film deposition and patterning techniques.
2Device complexity
If a planar pixel design is used, then the device structure is simple, but color shift occurs due to varying path lengths at different angles
Solution Approach 1:
The patent implements a three-dimensional concave curved shape for the pixel electrodes and light-emitting layer, which standardizes the optical path length for light emitted at different viewing angles. This curvature configuration eliminates color shift caused by varying path lengths while maintaining a relatively simple manufacturing process that can be integrated into existing OLED production lines.
3Ease of manufacture
If the pixel electrodes are formed after the pixel definition layer, then the manufacturing sequence is conventional, but the path length consistency cannot be achieved
Solution Approach 1:
The patent forms the pixel definition layer with a predetermined three-dimensional concave curved shape before depositing the pixel electrodes and light-emitting layer. This preliminary action ensures that subsequent layers conform to the curved profile, achieving consistent path length for light emission at different angles while maintaining a manufacturing sequence that builds upon conventional processes.
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 design maintains a consistent path length for emitted light at different angles, minimizing color shift and brightness variations observed by the human eye, thereby enhancing viewing angle consistency.
Implementation Method 1
The light emission principle of OLED devices is that semiconductor materials and organic materials and light-emitting materials are driven by electric fields, causing carrier injection and recombination to emit light
Implementation Method 2
bottom of an opening area of the pixel definition layer having a three-dimensional concave curved shape... maintains a consistent path length for emitted light at different angles
Data Source
AI summary
The invention provides an OLED pixel structure and OLED display panel. The OLED pixel structure comprises: a pixel definition layer, layer, a first pixel electrode, an OLED light-emitting layer, and a second pixel electrode; bottom of opening area of the pixel definition layer having a three-dimensional concave curved shape, the first pixel electrode disposed at the bottom of the corresponding opening area having a corresponding shape, the OLED light-emitting layer disposed on the first pixel electrode having a corresponding shape, the second pixel electrode disposed on the pixel definition layer and a portion corresponding to the OLED light-emitting layer having a corresponding shape. The invention provides a corresponding OLED display panel. The invention reduces the difference in path length of emitted light observed at different angles when passing through the OLED light-emitting layer and transparent electrode layer, thereby reducing the brightness and color observed by human eye at different angles.