OLED Display Scattering Layer for Wide Viewing Angle
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Solution Overview
Problem
Current display devices face limitations in improving viewing angles, particularly in organic light-emitting diode (OLED) displays, which affect the overall image quality and user experience.
Innovation Solution
The proposed display device incorporates a substrate with a transistor, a first pixel electrode, a scattering layer, a second pixel electrode that covers the side surface of the first pixel electrode, an emission layer, and a common electrode, where the second pixel electrode has a wider width and is in direct contact with the side surface of the first pixel electrode, and a passivation layer with a trench that does not overlap the first pixel electrode, enhancing light path alteration and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional single-layer pixel electrode structure is used, then the device structure is simple, but the viewing angle is limited
Solution Approach 1:
The pixel electrode is divided into two distinct layers: a first pixel electrode (191) and a second pixel electrode (195). The first pixel electrode is positioned at the bottom and the second pixel electrode is positioned at the top, with each layer serving specific functional purposes. This segmentation allows independent optimization of each layer's properties to improve viewing angle while managing structural complexity.
Solution Approach 2:
The second pixel electrode extends to cover the side surface of the first pixel electrode, transitioning from a planar two-dimensional structure to a three-dimensional structure that wraps around the first electrode. This dimensional change enables light scattering from multiple angles, significantly improving viewing angle performance.
2Illumination intensity
If the second pixel electrode has a wider width, then light scattering and viewing angle are improved, but the manufacturing precision requirements increase
Solution Approach 1:
A scattering layer (193) is introduced as an intermediary component positioned between the first pixel electrode (191) and the second pixel electrode (195). The scattering layer includes scatterers that diffuse light, and it serves as a buffer that reduces the sensitivity of the structure to alignment variations during manufacturing, thereby lowering precision requirements while maintaining effective light scattering.
3Device complexity
If the passivation layer includes a trench structure, then the second pixel electrode can cover side surfaces effectively, but the manufacturing process complexity increases
Solution Approach 1:
The trench structure is pre-formed in the passivation layer (180) before the second pixel electrode (195) is deposited. This preliminary action creates a prepared pathway that guides the second electrode to automatically cover the side surfaces of the first pixel electrode during the deposition process, simplifying the overall manufacturing process despite the added trench formation step.
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 significantly improves the viewing angle of the display device by effectively scattering light, leading to enhanced image quality and user experience.
Implementation Method 1
a scattering layer positioned on the first pixel electrode
Data Source
AI summary
A present disclosure relates to a display device and a manufacturing method, and the display device according to an embodiment includes: a substrate; a transistor positioned on the substrate; a first pixel electrode connected to the transistor; a scattering layer positioned on the first pixel electrode; a second pixel electrode positioned on the scattering layer and covering a side surface of the first pixel electrode; an emission layer positioned on the second pixel electrode; and a common electrode positioned on the emission layer.