Liquid Discharge Head Substrate Transistor Layout
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Solution Overview
Problem
Existing liquid discharge head technologies face challenges in downsizing and enhancing driving performance while maintaining efficient energy usage, as larger transistors required for higher heater current result in increased resistance and reduced efficiency due to longer current paths.
Innovation Solution
A liquid discharge head substrate configuration with transistors arranged on both sides of the heater in a direction orthogonal to the heater row, reducing the current path length and resistance, allowing for increased heater current with smaller power consumption and downsized design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If larger transistors are used to supply higher current to the heater for improved driving performance, then the heater current increases, but the transistor size and current path length increase resulting in increased resistance and reduced energy efficiency
Solution Approach 1:
The patent applies dimensionality change by arranging transistors in a two-dimensional layout around the heater element. Specifically, multiple transistors are positioned at different locations (first transistor at a first location, second transistor at a second location) surrounding the heater, allowing current to be supplied from multiple directions. This spatial arrangement reduces the current path length through the substrate compared to a single-transistor configuration, thereby reducing resistance and power consumption while maintaining the required heater current for improved driving performance.
2Loss of energy
If transistors are arranged to reduce current path length for lower resistance, then power consumption decreases, but the arrangement complexity of the substrate increases
Solution Approach 1:
The patent employs asymmetry in the transistor arrangement around the heater element. The transistors are positioned at specific asymmetric locations relative to the heater, with different transistors potentially having different configurations or connections. This asymmetric arrangement optimizes the current paths to minimize resistance while maintaining a manageable substrate layout, balancing energy efficiency with manufacturing complexity.
3Power
If multiple transistors are used to supply current to a single heater, then the driving performance is enhanced, but the number of components and wiring complexity increases
Solution Approach 1:
The patent applies merging by combining multiple transistors to work together on a single heater element. The first transistor and second transistor are both connected to the same heater, allowing their current contributions to merge at the heater. This configuration enables enhanced driving performance through increased or more controllable heater current while sharing common wiring paths to the heater, thereby managing the complexity of multiple components through functional consolidation.
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 configuration achieves a smaller liquid discharge head substrate with improved driving efficiency and reduced power consumption by minimizing the current path resistance and transistor size, enabling effective ink discharge with reduced energy usage.
Implementation Method 1
a heater having one end connected to the transistors and the other end connected to the wiring supplied with the first potential
Data Source
AI summary
A liquid discharge head substrate includes a first heater row including a plurality of heaters arranged in a first direction, a first transistor configured to drive a first heater of the plurality of heaters, and a second transistor configured to drive the first heater. The first heater is arranged between the first transistor and the second transistor in a second direction crossing the first direction.