Grooved Planarization Layer Reducing OLED Contact Hole Reflectivity
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Solution Overview
Problem
Existing OLED devices face reduced visibility due to high external light reflectivity at the contact hole, which affects display quality.
Innovation Solution
Incorporating a planarization layer with grooves surrounding the contact hole to reduce external light reflectivity by increasing the width of the contact hole and enhancing irregular reflection in the grooves, thereby improving display visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact hole is formed in the planarization layer to electrically connect the lower electrode and semiconductor element, then electrical connection is achieved, but external light reflectivity increases reducing display visibility
Solution Approach 1:
The planarization layer is segmented by forming grooves that divide the layer into multiple regions around the contact hole. This segmentation creates multiple reflection interfaces that scatter external light, reducing the harmful reflectivity while preserving the electrical connection function of the contact hole.
Solution Approach 2:
The grooves act as an intermediary structure between the contact hole and the external environment. They intercept and scatter external light before it can reflect directly from the contact hole, thereby mediating the interaction between light and the electrical connection structure.
2Reliability
If the contact hole width is increased to improve electrical connection, then electrical reliability improves, but external light reflectivity increases further reducing visibility
Solution Approach 1:
By segmenting the planarization layer with grooves around the contact hole, the invention allows the contact hole to be larger for better electrical connection while the grooves simultaneously scatter light to reduce reflectivity. The segmentation creates multiple light scattering paths that compensate for the increased hole size.
Solution Approach 2:
The grooves are locally positioned around the contact hole to provide targeted light scattering exactly where needed. This local modification allows the contact hole to maintain its electrical connection function while the surrounding grooves specifically address the light reflectivity problem in the critical area.
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 solution effectively reduces external light reflectivity at the contact hole, enhancing the visibility of the OLED device by increasing the phenomenon of irregular reflection in the grooves, thus improving display quality.
Implementation Method 1
enhancing the phenomenon of irregular reflection in the grooves, thereby improving display visibility
Data Source
AI summary
An organic light emitting display (OLED) device includes a substrate, a semiconductor element on the substrate, a planarization layer on the semiconductor, and a light emitting structure on the planarization layer. The planarization layer includes a contact hole exposing a portion of the semiconductor and a plurality of grooves surrounding the contact hole. The light emitting structure is electrically connected to the semiconductor element via the contact hole.