Integrated LED Display Layer Stack for High Luminosity
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Solution Overview
Problem
Existing display devices using light emitting diodes face limitations in luminosity and production complexity, particularly with passive matrix systems where multiple LEDs cannot be operated simultaneously and active matrix systems require precise bonding processes that become challenging with miniaturization.
Innovation Solution
A display device and method involving a layer stack with a semiconductor layer sequence and integrated circuit layer, where the semiconductor layer sequence forms pixels and switches are integrated within the same layer stack, eliminating the need for complex bonding processes and allowing for high luminosity and miniaturization without compromising production simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive matrix is used to contact pixels via row and column lines, then the device structure is simple, but multiple light emitting diodes cannot be operated simultaneously resulting in limited luminosity
Solution Approach 1:
The patent combines the driver elements and LED structures into a single integrated layer stack, eliminating the need for separate carriers and complex bonding processes. This integration allows multiple pixels to be operated simultaneously while maintaining structural simplicity, resolving the contradiction between device complexity and luminosity.
2Illumination intensity
If an active matrix circuit is used to operate multiple pixels in parallel, then luminosity can be improved, but the bonding process becomes complex and requires high alignment accuracy
Solution Approach 1:
The patent merges the driver elements and LED structures into a single integrated layer stack grown on one carrier. This eliminates the need for separate carriers and complex aligned bonding processes, significantly reducing manufacturing complexity while maintaining the ability to operate multiple pixels in parallel for high luminosity.
Solution Approach 2:
The patent transitions from a planar integration approach to a vertical layer stack architecture. By stacking driver elements and LED structures in multiple layers along the vertical dimension, the patent achieves complex functionality without increasing lateral complexity, simplifying the bonding process while enabling high luminosity through parallel pixel operation.
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 solution enables high luminosity display devices with simplified production, allowing for smaller pixel sizes and increased resolution, and reduces the complexity and alignment requirements of bonding processes, thereby enhancing production reliability and efficiency.
Implementation Method 1
A display device and method involving a layer stack with a semiconductor layer sequence and integrated circuit layer, where the semiconductor layer sequence forms pixels and switches are integrated within the same layer stack, eliminating the need for complex bonding processes and allowing for high luminosity and miniaturization without compromising production simplicity.
Data Source
AI summary
The invention relates to a display device, comprising a layer stack, which comprises a semiconductor layer sequence having an active region for producing radiation and comprises a circuit layer. The semiconductor layer sequence forms a plurality of pixels. For each pixel, a respective switch connected in an electrically conductive manner to the pixel is formed in the circuit layer. The invention further relates to a method for producing a display device.