Stacked LED Structure for Color Accuracy Without Light Interference
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Solution Overview
Problem
Current light emitting diodes (LEDs) in display devices face challenges in achieving high light reproducibility and color accuracy due to overlapping active layers, which can lead to interference between different wavelengths of light emitted from stacked layers.
Innovation Solution
A light emitting device design featuring vertically stacked light emitting parts with non-overlapping active layers, each emitting different wavelengths, and using bonding parts with greater thickness than the active layers to prevent light interference, eliminating the need for additional color filters or light blocking layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting layers are vertically stacked to increase color variety, then the device can emit multiple wavelengths, but overlapping active layers cause light interference and reduce color accuracy
Solution Approach 1:
The patent transitions from horizontal arrangement of light emitting layers to vertical stacking with increased separation distance in the vertical dimension. By stacking layers with sufficient spacing in the vertical direction, the patent maintains multi-color capability while reducing optical interference between layers, thus resolving the contradiction between color variety and color accuracy.
2Manufacturing precision
If bonding parts are made thicker to prevent light interference between layers, then light reproducibility improves, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the bonding parts: they serve both as structural adhesives to bond light emitting layers together and as optical isolation layers to prevent light interference. By making the bonding parts thicker, they simultaneously achieve mechanical bonding and optical separation, thus improving light reproducibility without proportionally increasing device complexity.
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 design enhances light reproducibility and color reliability by ensuring that light from each layer is emitted without interference, improving the overall performance of the display device.
Implementation Method 1
a first bonding part bonding and electrically coupling the first n-type semiconductor layer and the second n-type semiconductor layer to each other
Implementation Method 2
Light emitting diodes as inorganic light sources are being diversely used in various fields
Implementation Method 3
Each pixel of a display device includes blue, green, and red sub-pixels, and the color of a particular pixel is determined through the colors of the sub-pixels
Data Source
AI summary
A light emitting device includes a first light emitting part including a first n-type semiconductor layer, and a first mesa structure including a first active layer, a first p-type semiconductor layer, and a first transparent electrode vertically stacked one over another and exposing a portion of a first surface of the first n-type semiconductor layer, a second light emitting part spaced apart from the first mesa structure, and including a second n-type semiconductor layer, a second active layer, a second p-type semiconductor layer, and a second transparent electrode and exposing a portion of a first surface of the second n-type semiconductor layer, and a first bonding layer on which the first and second light emitting parts are disposed and electrically coupling the first n-type semiconductor layer and the second n-type semiconductor layer to each other.