Semiconductor Device Driving Unit Resistance Gradient
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Solution Overview
Problem
Existing liquid discharge heads face challenges in maintaining consistent voltage across discharge elements due to variations in wiring resistance, leading to inconsistent liquid discharge and degraded image quality, especially when there are layout restrictions on terminal units and wiring lines.
Innovation Solution
The semiconductor device incorporates a layout where the resistance of driving units decreases with increasing distance from the terminal unit, using transistors with varying channel widths and lengths to balance the voltage applied to discharge elements, and employs lattice-shaped wiring patterns to reduce wiring resistance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiring pattern is designed to reduce voltage variation by arranging terminal units and adjusting wiring widths, then voltage consistency improves, but layout flexibility deteriorates
Solution Approach 1:
The patent applies local quality by configuring driving units with different resistances at different positions along the wiring line. Specifically, driving units farther from the terminal unit are given lower resistance than those closer to it, creating a resistance gradient that compensates for the cumulative wiring resistance effect. This localized differentiation in driving unit characteristics enables voltage consistency across all discharge elements without requiring complex wiring width adjustments or specific terminal unit arrangements.
2Reliability
If wiring resistance variation is compensated by adjusting wiring widths, then voltage variation reduces, but manufacturing complexity increases
Solution Approach 1:
The patent employs parameter changes by systematically varying the resistance values of driving units based on their positional distance from the terminal unit. Instead of modifying wiring widths to compensate for resistance variations, the invention changes the electrical parameter (resistance) of the driving units themselves. This approach simplifies manufacturing because it requires only adjusting transistor dimensions in the driving units, which is a standard semiconductor fabrication process, rather than implementing complex non-uniform wiring width patterns.
3Productivity
If discharge elements are positioned farther from the terminal unit, then more discharge elements can be arranged, but voltage applied to them decreases due to wiring resistance
Solution Approach 1:
The patent implements preliminary anti-action by pre-configuring the driving units with position-dependent resistance values before the voltage distribution problem manifests. Driving units that will be farther from the terminal unit are designed with lower resistance to preemptively counteract the increased wiring resistance they will encounter. This anticipatory design ensures that all discharge elements, regardless of their distance from the terminal unit, receive consistent voltage, enabling high-density arrangement without sacrificing voltage uniformity.
Data Source
AI summary
A semiconductor device is provided. The device comprises discharge units each including a discharge element and a driving unit configured to drive the discharge element, and a terminal unit configured to supply power to the discharge units via a wiring line. The discharge units include a first discharge unit including a first discharge element of the discharge elements and a first driving unit of the driving units and a second discharge unit including a second discharge element of the discharge elements and a second driving unit of the driving units. A length of a current path from the terminal unit to the first discharge unit is longer than a length of a current path from the terminal unit to the second discharge unit and a resistance of the first driving unit is lower than a resistance of the second driving unit.