Display Device Groove Structure for Efficient Light Extraction
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Solution Overview
Problem
Existing display devices face challenges in enhancing light output efficiency and improving driving voltage while maintaining reliable electrical connections in light emitting elements.
Innovation Solution
The display device incorporates a groove in the light emitting element with a second semiconductor layer, a common electrode, and a light scattering layer to scatter and diffuse light, reducing the distance to the light output surface and improving electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a groove is formed in the light emitting element to reduce distance to light output surface, then light output efficiency is improved, but device complexity increases
Solution Approach 1:
The light emitting element is segmented by forming a groove that divides the second semiconductor layer into distinct regions. This segmentation creates a textured pattern that enhances light extraction efficiency by reducing total internal reflection at the interface, thereby improving light output efficiency without requiring complete structural redesign
Solution Approach 2:
The groove introduces a vertical dimension to the light emission path by creating depth variations in the second semiconductor layer. This dimensional change allows light to escape through multiple paths (direct transmission and side emission from groove walls), effectively reducing the optical path length and improving light output efficiency
2Reliability
If common electrode contacts first portion of second semiconductor layer to improve electrical connection, then driving voltage is improved, but manufacturing precision requirements increase
Solution Approach 1:
The second semiconductor layer is designed with non-uniform doping concentration, creating a first portion with higher doping concentration specifically at the contact region. This local quality variation ensures low contact resistance and reliable electrical connection between the common electrode and the light emitting element, while the rest of the layer maintains optimal properties for light emission
Solution Approach 2:
The groove structure is formed in advance before electrode deposition, pre-positioning the contact area and defining the geometry where the common electrode will make contact with the first portion of the second semiconductor layer. This preliminary structuring simplifies subsequent electrode fabrication and ensures consistent electrical connection
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 light output efficiency, enhances driving voltage, and improves the reliability and power consumption of the display device by effectively scattering light and improving ohmic contact.
Implementation Method 1
a light scattering layer on the common electrode and filling the groove
Data Source
AI summary
A display device includes a pixel electrode, a light emitting element including a first semiconductor layer, an active layer, and a second semiconductor layer sequentially located on the pixel electrode, a groove being in a portion of the light emitting element where the second semiconductor layer is located, a common electrode on the light emitting element, and a light scattering layer on the common electrode and filling the groove.