Inclined Electrode Light Emitting Display Device
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Solution Overview
Problem
Light emitting display devices face efficiency losses and color shift issues due to light reflection between the emission layer and electrodes, leading to decreased color reproducibility and viewing angle-dependent color variations.
Innovation Solution
A light emitting display device design featuring an insulating layer with an inclined portion, a first electrode with a reflective material and inclined structure, and multiple color conversion layers with semiconductor nano-particles, along with a transmission layer and blue light-blocking filters, to minimize light loss and color shift by optimizing light path and emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light emitting display device uses conventional flat electrode structure, then device structure is simple, but light transmission efficiency decreases due to reflection between emission layer and electrodes
Solution Approach 1:
The patent applies curvature by forming the first electrode with an inclined portion instead of a flat surface. This inclined structure reduces the reflection of light between the emission layer and electrodes, thereby improving light transmission efficiency. The curved/inclined surface changes the angle of light reflection to allow more light to escape through the top electrode rather than being trapped and reflected back into the emission layer.
2Manufacturing precision
If conventional flat electrode structure is used, then manufacturing process is simple, but color shift occurs depending on viewing angle
Solution Approach 1:
The inclined portion of the first electrode creates a non-flat surface that modifies light emission characteristics. This curvature ensures that light is emitted more uniformly across different viewing angles, reducing the color shift effect. The inclined surface redirects light paths so that viewers at different angles perceive consistent color information.
3Loss of energy
If inclined portion is added to insulating layer and electrode, then light transmission efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The inclined portion is integrated into the insulating layer formation process, combining the insulating function with the light management function in a single structural feature. This integration reduces the need for separate components while achieving the light transmission improvement.
4Manufacturing precision
If multiple color conversion layers are added, then color reproducibility improves, but device structure becomes more complex
Solution Approach 1:
The patent combines multiple color conversion layers (first and second color conversion layers with different quantum dots) into a single integrated structure on the light emitting device. This merging approach maintains color accuracy while consolidating the layer structure rather than using separate discrete components.
Solution Approach 2:
The color conversion layers use composite quantum dot materials with different size ranges (first quantum dots: 20-40nm, second quantum dots: 40-60nm) to achieve broad spectrum color conversion. This composite material approach enables high color accuracy through material composition rather than complex structural arrangements.
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 design enhances color reproducibility and reduces color shift by maximizing light transmission and emission efficiency, ensuring consistent color representation across different viewing angles.
Implementation Method 1
a reflective metal layer disposed on the plurality of color conversion layers
Implementation Method 2
Each light emitting element emits light using energy generated when excitons, which are created by combining electrons with holes, fall from an exited state to a ground state inside the emission layer
Implementation Method 3
the transmission layer may include a plurality of scatterers
Data Source
AI summary
A light emitting display device according to an exemplary embodiment of the present disclosure includes: a first substrate; an insulating layer disposed on the first substrate and having an inclined portion; a first electrode disposed on the insulating layer; a light-emitting layer disposed on the first electrode; a second electrode disposed on the light-emitting layer; and a plurality of color conversion layers disposed on the second electrode. The first electrode includes an inclined portion that is inclined along the inclined portion of the insulating layer based on a surface parallel to the first substrate, and the light-emitting layer includes semiconductor nano-particles.