Stacked Light Emitting Elements for High-Resolution Color Displays
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Solution Overview
Problem
Traditional light emitting diode display panels face challenges in increasing resolution due to the decreasing spatial pitch between light emitting diodes and the occupation of a large area, making it difficult to improve manufacturing efficiency and circuit layout flexibility.
Innovation Solution
A light emitting device structure comprising a first and second light emitting element stacked together, where the second cathode is electrically connected to the first anode, allowing for independent voltage control to emit different color lights, reducing the need for multiple colors integrated into a single diode and simplifying the circuit layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light emitting diodes of multiple colors are disposed on the same plane, then full-color display is implemented, but display resolution decreases due to large occupied area
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of light emitting diodes to a three-dimensional vertical stacking configuration. Multiple light emitting elements of different colors are stacked vertically along the thickness direction, enabling full-color display while reducing the horizontal footprint and improving display resolution.
2Adaptability or versatility
If light emitting diodes of multiple colors are disposed on the same plane, then full-color display is implemented, but spatial pitch between diodes decreases significantly
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of light emitting diodes to a three-dimensional vertical stacking configuration. Multiple light emitting elements of different colors are stacked vertically along the thickness direction, enabling full-color display while reducing the horizontal footprint and improving display resolution.
3Adaptability or versatility
If light emitting diodes of multiple colors are disposed on the same plane, then full-color display is implemented, but circuit density increases
Solution Approach 1:
The patent merges multiple light emitting elements vertically, where the cathode of an upper element is electrically connected to the anode of a lower element. This stacking configuration reduces the number of separate circuit connections required compared to planar arrangements, thereby reducing circuit density and manufacturing 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 approach enhances the brightness of color light, reduces process complexity, and improves resolution by occupying a smaller area, while also simplifying the circuit layout and reducing the number of external conductive lines.
Implementation Method 1
A voltage difference between the first anode and the first cathode is enabled to be greater than a first value, so that the first light emitting element emits a first color light
Data Source
AI summary
A light emitting device structure including a first light emitting element and a second light emitting element is provided. The first light emitting element includes a first anode and a first cathode. The second light emitting element is stacked on the first light emitting element and includes a second anode and a second cathode, wherein the second cathode is electrically connected to the first anode. An operation method of the light emitting device structure is also provided.