Micro-Transfer Printed MEMS-CMOS Integration for Large Actuator Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing MEMS systems, such as inkjet print heads, are bulky and require many wires due to the limitations of ribbon cables, restricting array size and efficiency.
Innovation Solution
Micro-transfer printing is used to integrate CMOS chiplets with MEMS devices on a semiconductor substrate, utilizing a redistribution layer (RDL) to connect high-density CMOS drivers directly to MEMS actuators, reducing the need for off-chip wires and enabling large arrays of actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ribbon cables are used to connect MEMS arrays to external drivers, then the system can be assembled with separate electronics, but the system becomes bulky and the array size is limited
Solution Approach 1:
The patent merges the MEMS array and CMOS driver electronics into a single integrated chip structure. The CMOS drivers are formed directly on the same substrate as the MEMS actuators, eliminating the need for separate electronics and ribbon cables. This integration reduces the overall system volume while maintaining full functionality.
Solution Approach 2:
The patent transitions from a planar connection approach (ribbon cables connecting separate components) to a three-dimensional integrated structure. Multiple conductive layers and vertical interconnects enable electrical connections within the chip thickness, allowing dense packing of drivers and actuators without increasing the footprint area.
2Ease of manufacture
If ribbon cables are used to connect MEMS arrays to external drivers, then separate electronics can be used, but many wires are required increasing complexity
Solution Approach 1:
By combining the MEMS and CMOS technologies on a single substrate, the patent eliminates the wiring complexity associated with connecting separate components. The drivers are positioned adjacent to the actuators they control, and electrical connections are established through integrated conductive paths rather than external wires.
Solution Approach 2:
The patent segments the chip into distinct functional regions: MEMS actuator areas and CMOS driver areas. This segmentation allows each region to be optimized for its specific function while maintaining close proximity and direct electrical connectivity through integrated interconnect structures.
3Productivity
If large arrays of MEMS devices are implemented, then the functionality and performance improve, but the array size is restricted by ribbon cable limitations
Solution Approach 1:
The patent utilizes vertical interconnects and multi-layer conductive structures to connect drivers to actuators in three-dimensional space. This enables dense array configurations where drivers can be positioned close to multiple actuators, increasing array size without being constrained by planar ribbon cable width.
Solution Approach 2:
The integrated chip structure serves multiple functions simultaneously: it houses the MEMS actuators, incorporates the CMOS drivers, provides electrical interconnects, and enables signal processing. This multi-functionality in a single structure supports large array sizes that would be impractical with separate components.
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 allows for a more compact and efficient integration of MEMS and CMOS technologies, facilitating large MEMS arrays with reduced wiring burden and improved actuator control, enhancing the performance and scalability of MEMS systems.
Implementation Method 1
a piezoelectric element (14) for actuating the membrane (8) by applying a voltage to the piezoelectric element (14)
Data Source
AI summary
A method of forming a semiconductor structure includes providing a semiconductor substrate, forming a micro-electromechanical structure (MEMS) device in and/or on the semiconductor substrate, and providing a semiconductor chiplet comprising a circuit configured to provide input for the MEMS device and/or to process output from the MEMS device. The method further includes micro-transfer printing the semiconductor chiplet onto the semiconductor substrate, and connecting the circuit to the MEMS device.