Isolating Insulative Layer for Light Emitting Cells
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Solution Overview
Problem
Current light emitting devices with multiple cells on a single substrate face issues of current leakage and difficulty in forming wirings due to deep trenches, which reduces light efficiency and leads to device failure, and require wavelength conversion for general illumination.
Innovation Solution
A light emitting device with an isolating insulative layer between cells to prevent current leakage and facilitate wiring formation, along with a wavelength conversion material layer containing phosphors to emit mixed light, such as white light, at the chip level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deep trenches are formed between light emitting cells to isolate them, then electrical isolation between cells is improved, but particles remain in trenches causing current leakage and wiring formation becomes difficult
Solution Approach 1:
An insulating layer is introduced as an intermediary substance to fill the trenches between light emitting cells. This insulating layer serves as a mediator that provides both electrical isolation and a smooth surface for wiring formation, eliminating the problems of particle accumulation and wiring difficulty associated with deep trenches.
Solution Approach 2:
The physical and chemical parameters of the trench region are changed by filling it with an insulating material. This transforms the trench from a problematic deep cavity that traps particles into a filled structure with controlled electrical and surface properties, enabling both isolation and easy wiring.
2Reliability
If deep trenches are formed between light emitting cells, then electrical isolation is improved, but current leakage occurs due to particles remaining in trenches
Solution Approach 1:
The insulating layer acts as an intermediary that replaces the particle-filled trench environment with a clean, controlled insulating medium. This eliminates the source of current leakage while maintaining the electrical isolation function.
Solution Approach 2:
The deep trench structure, which initially causes harm by trapping particles, is transformed into a beneficial structure by filling it with insulating material. The same trench geometry that caused problems now serves to contain and isolate the insulating material, providing both isolation and a particle-free environment.
3Device complexity
If multiple light emitting cells are connected in series on a single substrate, then device complexity is reduced, but current leakage between cells reduces light emitting efficiency
Solution Approach 1:
The insulating layer serves as a mediator between adjacent light emitting cells, providing electrical isolation that prevents current leakage while allowing the cells to remain on a single substrate. This maintains the simplified device structure while eliminating the energy loss from leakage.
4Reliability
If deep trenches are formed to isolate light emitting cells, then electrical isolation is improved, but the process of forming wirings becomes difficult
Solution Approach 1:
The insulating layer fills the trenches and provides a smooth, planar surface that facilitates wiring formation. As an intermediary, it eliminates the topographical challenges of deep trenches while maintaining the electrical isolation function.
Solution Approach 2:
The insulating layer is formed in the trenches before the wiring formation process. This preliminary action prepares the surface by filling irregularities and providing a suitable substrate for subsequent wiring deposition, making the manufacturing process easier.
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
Prevents current leakage, simplifies wiring formation, and enables the emission of mixed light at the chip level, enhancing light emitting efficiency and device reliability.
Implementation Method 1
a light emitting device having a wavelength conversion material layer at a chip level is necessary to simplify packaging processes
Implementation Method 2
a wavelength conversion material layer containing phosphors to emit mixed light, such as white light
Data Source
AI summary
Disclosed is a light emitting device having an isolating insulative layer for isolating light emitting cells from one another and a method of fabricating the same. The light emitting device comprises a substrate and a plurality of light emitting cells formed on the substrate. Each of the light emitting cells includes a lower semiconductor layer, an upper semiconductor layer positioned on one region of the lower semiconductor layer, and an active layer interposed between the lower and upper semiconductor layers. Furthermore, an isolating insulative layer is filled in regions between the plurality of light emitting cells to isolate the light emitting cells from one another. Further, wirings electrically connect the light emitting cells with one another. Each of the wirings connects the lower semiconductor layer of one light emitting cell and the upper semiconductor layer of another light emitting cell adjacent to the one light emitting cell. Accordingly, there can be provided a light emitting device wherein particles are prevented from remaining between the plurality of light emitting cells to prevent current leakage between the light emitting cells. Further, there can be provided a light emitting device wherein the regions between light emitting cells are filled with an isolating insulative layer to facilitate formation of the wirings.