Display Device With Concavo-Convex Electrode Pattern
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Solution Overview
Problem
Current display devices face challenges in enhancing luminous efficiency, particularly in the design of light emitting elements where light conversion efficiency and durability are limited by conventional electrode and semiconductor layer configurations.
Innovation Solution
A display device is designed with a light emitting element featuring a concavo-convex pattern on the upper surface of the second contact electrode, matching the shape of the semiconductor layers, and a color conversion layer that includes phosphors to improve light conversion efficiency and durability by optimizing the path of light emission and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional flat electrode structure is used, then the manufacturing process is simple, but the light conversion efficiency and utilization area of the color conversion layer are limited
Solution Approach 1:
The electrode surface is transformed from a flat plane to a concavo-convex pattern with curved surfaces. The convex portions create multiple light reflection paths, increasing the probability of light absorption by the color conversion layer and improving light conversion efficiency while maintaining manufacturing feasibility through patterned deposition techniques.
Solution Approach 2:
The electrode structure transitions from a two-dimensional flat surface to a three-dimensional concavo-convex pattern. This dimensional change increases the surface area and creates multiple light interaction paths, enhancing the utilization area of the color conversion layer and overall light conversion efficiency without significantly complicating the manufacturing process.
2Productivity
If the color conversion layer area is increased to improve luminous efficiency, then more light can be converted, but the device area and complexity increase
Solution Approach 1:
The color conversion layer is divided into multiple regions corresponding to the concavo-convex pattern of the electrode. Each convex portion creates a localized light conversion zone, allowing the color conversion layer to be segmented into functional units that can be manufactured independently and assembled, reducing overall device complexity while maintaining high luminous efficiency.
Solution Approach 2:
The concavo-convex pattern creates a nested structure where the color conversion layer is positioned within the convex portions and in the concave regions. This nesting arrangement maximizes the color conversion layer area within a compact footprint, improving luminous efficiency without proportionally increasing device area or complexity.
3Loss of energy
If a concavo-convex pattern is introduced on the electrode surface to improve light conversion efficiency, then light utilization is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The concavo-convex pattern parameters (depth, width, spacing) are optimized to achieve high light conversion efficiency within manufacturable tolerances. By adjusting these parameters, the design achieves effective light trapping and color conversion while remaining compatible with standard fabrication processes and precision capabilities.
Solution Approach 2:
The concavo-convex pattern creates local variations in surface properties where light interaction is enhanced. The manufacturing precision requirements are concentrated in specific critical dimensions of the pattern, while other areas can be manufactured with standard tolerances, allowing for selective precision control that balances performance with manufacturability.
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 concavo-convex pattern increases the light conversion efficiency and utilization area of the color conversion layer, enhancing the luminous efficiency and extending the lifetime of the phosphor, thereby improving the overall display performance.
Implementation Method 1
the color conversion layer includes: a red converter configured to absorb blue light and to emit red light; and a green converter configured to absorb blue light and to emit green light
Implementation Method 2
energy generated by recombination of holes and electrons is converted into light energy
Data Source
AI summary
A display device includes a substrate, a first electrode on the substrate, a light emitting element including: a first contact electrode connected to the first electrode, a first semiconductor layer on the first contact electrode, an active layer on the first semiconductor layer, a second semiconductor layer on the active layer, and a second contact electrode on the second semiconductor layer, a second electrode on the light emitting element, and a color conversion layer on the light emitting element and the second electrode, wherein an upper surface of the second contact electrode has a concavo-convex pattern.