Driver IC Miniaturization via Wafer-on-Wafer Substrate Segmentation
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Solution Overview
Problem
The miniaturization of driver integrated circuits (ICs) is hindered by the complexity of their circuits, making it difficult to reduce their size effectively, especially when multiple voltage-level circuits are integrated on a single substrate.
Innovation Solution
The driver IC is designed using a wafer-on-wafer process, where circuits driven at different voltage levels are divided and mounted on separate substrates, allowing for the reduction of the overall size by optimizing substrate area utilization and bonding methods such as wire bonding, flip chip bonding, or through silicon via (TSV) bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple voltage-level circuits are integrated on a single substrate, then circuit functionality is complete, but driver IC size increases
Solution Approach 1:
The driver IC is divided into multiple substrates, with each substrate dedicated to specific voltage-level circuits. The first substrate contains circuits for first voltage level, the second substrate contains circuits for second voltage level, and the third substrate contains circuits for third voltage level. This segmentation allows each substrate to be optimized independently, reducing the overall area while maintaining complete circuit functionality.
Solution Approach 2:
The patent transitions from a two-dimensional integration on a single substrate to a three-dimensional stacked configuration with multiple substrates bonded together. This dimensional change enables better space utilization and reduces the footprint area of the driver IC while accommodating all necessary voltage-level circuits.
2Area of stationary object
If circuits are divided across multiple substrates, then driver IC size is reduced, but manufacturing complexity increases
Solution Approach 1:
By segmenting the driver IC into multiple substrates with specific circuits on each, the patent enables independent optimization and manufacturing of each substrate. This segmentation actually simplifies the manufacturing process for each individual substrate while achieving overall size reduction, as each substrate can be fabricated with fewer masks and simpler processes.
Solution Approach 2:
The patent merges multiple separately manufactured substrates into a single integrated driver IC through substrate bonding. This merging process, while adding a bonding step, allows each substrate to be manufactured independently with optimized processes, ultimately reducing overall manufacturing complexity compared to fabricating all circuits on a single large substrate.
3Area of stationary object
If circuits are divided across multiple substrates, then substrate area utilization is optimized, but bonding process complexity increases
Solution Approach 1:
The segmentation into multiple substrates allows each substrate to be manufactured with optimized area utilization for its specific circuits. The bonding process connects these pre-optimized substrates, and while bonding adds a step, it enables better overall area utilization than attempting to integrate all circuits on a single substrate.
Data Source
AI summary
Disclosed herein is a driver integrated circuit (IC), which can be miniaturized and includes a plurality of circuits, including a first substrate, a first circuit driven at a first level voltage and mounted on the first substrate, a second substrate bonded to the first substrate, and a second circuit including one or more sub-circuits driven at a second level voltage that is higher than the first level voltage, wherein at least one among the one or more sub-circuits is mounted on the second substrate.