Angled Light-Emitting Element Layout for Higher-Efficiency Displays
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Solution Overview
Problem
Current display devices face challenges in achieving high luminous efficiency due to limitations in the design and materials used in light emitting elements, which affect the emission and directionality of light.
Innovation Solution
The display device incorporates a specific structure with a first via layer and a second via layer, featuring trench parts and openings that allow light emitting elements to extend in a direction not parallel to the substrate surface, with the second via layer using a siloxane-based organic insulating material for improved light transmittance, and sub electrodes on bank parts to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting elements are disposed parallel to the substrate surface, then the structure is simple and easy to manufacture, but luminous efficiency is reduced due to limited light emission directions
Solution Approach 1:
The light emitting elements are disposed at an angle (0-60 degrees) relative to the substrate surface normal, transitioning from a conventional parallel arrangement to a three-dimensional angled configuration. This dimensional change enables light emission in multiple directions (upward, sideways, and downward), thereby improving luminous efficiency without significantly complicating the manufacturing process
2Loss of energy
If reflective structures are added to improve light emission upward, then luminous efficiency improves, but device complexity and space requirements increase
Solution Approach 1:
The patent extracts and eliminates the need for separate reflective structures by directly configuring the light emitting elements at an angle. The angled disposition itself serves the function that would otherwise require additional reflective components, thereby improving luminous efficiency while reducing device complexity and space requirements
3Loss of energy
If light emitting elements extend vertically at an angle, then light emission in multiple directions is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a broad angular range (0-60 degrees) for the light emitting elements' disposition, providing flexibility in manufacturing. This parameter range allows for optimized luminous efficiency while accommodating variations in manufacturing precision, making the angled configuration achievable with standard manufacturing capabilities
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 improves luminous efficiency by allowing light to be emitted through both ends and side surfaces of the light emitting elements, resulting in enhanced light travel upward and reduced need for reflective structures, thus optimizing space and design in the display device.
Implementation Method 1
the second via layer using a siloxane-based organic insulating material for improved light transmittance
Data Source
AI summary
A display device includes a first via layer on a substrate and including trench parts recessed from an upper surface of the first via layer, a first electrode and a second electrode on the first via layer and spaced apart from each other, a second via layer on the first via layer and including first openings partially exposing the first electrode, and a second opening partially exposing the second electrode, light emitting elements in the first openings of the second via layer and extending in a direction, and a third electrode on the second via layer. Each of the light emitting elements includes a first end electrically connected to the first electrode and a second end electrically connected to the third electrode such that the extending direction of the light emitting elements is not parallel to an upper surface of the substrate.