OLED Passivation Layer Protruding Patterns Viewing Angle
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Solution Overview
Problem
Existing organic light emitting diode (OLED) display devices face challenges in improving viewing angles while preventing short circuits between the pixel and common electrodes due to the thickness of protruding and depressed patterns in the passivation layer.
Innovation Solution
The OLED display device incorporates a passivation layer with protruding and depressed patterns, where the pixel electrode is formed on these patterns, allowing for a protruding and depressed shape that enhances viewing angles while maintaining a thin thickness to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the passivation layer is made thicker to prevent short circuits, then reliability improves, but viewing angle deteriorates
Solution Approach 1:
The passivation layer is segmented into multiple regions with different thicknesses: a first region with greater thickness for short circuit prevention, and a second region with lesser thickness for viewing angle improvement. This segmentation allows each region to fulfill its specific function independently.
Solution Approach 2:
Different regions of the passivation layer are given different local qualities (thicknesses) according to their functional requirements. The first region has increased thickness locally to prevent short circuits, while the second region maintains reduced thickness to enhance viewing angle, achieving optimal performance in both areas.
2Shape
If the protruding and depressed pattern thickness is increased to improve viewing angle, then display performance improves, but short circuit risk increases
Solution Approach 1:
The protruding and depressed pattern is segmented into different thickness zones within the passivation layer structure. The pattern creates regions of varying thickness that simultaneously achieve the desired viewing angle enhancement while maintaining adequate insulation thickness for short circuit prevention.
Solution Approach 2:
The thickness parameter of the passivation layer is varied spatially to resolve the contradiction. By changing the thickness parameter from uniform to non-uniform distribution, the structure achieves both improved viewing angle (through appropriate thickness variation) and maintained short circuit prevention (through sufficient minimum thickness).
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 improves the viewing angle of the OLED display while minimizing the risk of short circuits between the pixel and common electrodes, thereby enhancing display performance and reliability.
Implementation Method 1
an electron injected from one electrode and a hole injected from the other electrode are coupled with each other in the organic emission layer to generate an exciton, and the exciton emits energy to emit light
Data Source
AI summary
An OLED display device includes a driving semiconductor layer on a substrate, a gate insulating layer covering the driving semiconductor layer, a driving gate electrode and etching preventing layer on the gate insulating layer, a passivation layer on the gate insulating layer, driving gate electrode, and etching preventing layer, and including a plurality of protruding and depressed patterns, driving source and drain electrodes on the passivation layer, a pixel electrode on the protruding and depressed pattern, and exposed etching preventing layer, the pixel electrode having a protruding and depressed shape, a pixel definition layer on the passivation layer, and the driving source and drain electrodes, and having a pixel opening exposing the pixel electrode, an organic emission layer on the exposed pixel electrode, and a common electrode on the organic emission layer and pixel definition layer. The protruding and depressed pattern partially exposes the etching preventing layer.