Fluid Ejection Device Memory Integration Reduces Die Space
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Solution Overview
Problem
In fluid ejection devices, such as inkjet printheads, the increasing number of signal lines for control circuitry leads to a larger footprint due to the need for numerous signal pads, which occupies valuable die space, especially when adding features like memory devices.
Innovation Solution
Implementing a hybrid memory arrangement where a fluid ejection device shares control and data lines, utilizing a first non-volatile memory for identification and a second non-volatile memory for fluid actuation data, with the fire line and ID line performing dual tasks to reduce the number of input/output pads required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of signal lines for control circuitry is increased, then the control capability is improved, but the die space is increased
Solution Approach 1:
The patent merges the memory device with the fluid ejection device by integrating it onto the same die. The memory device shares control and data lines with the fluid ejection device, combining multiple functions into a single integrated unit. This merging approach allows the system to maintain enhanced control capability while avoiding the need for separate memory packaging that would consume additional die space.
Solution Approach 2:
The patent implements multi-functionality by designing the integrated device where the same physical structure serves multiple purposes. The fluid ejection device incorporates memory functionality, allowing it to store identification data, fluid actuation data, and control information. This universal design enables the single die to perform both fluid ejection and data storage functions, eliminating the need for separate dedicated memory components.
2Quantity of substance
If memory devices are added to the fluid ejection device, then the data storage capability is improved, but the number of input/output pads is increased
Solution Approach 1:
The patent combines the input/output lines for the memory device with the existing control and data lines of the fluid ejection device. By merging these lines, the system achieves enhanced data storage capability without proportionally increasing the number of input/output pads. The same physical lines serve dual purposes: carrying control signals for the fluid ejection device and data for the memory device.
Solution Approach 2:
The patent creates a universal interface where the control and data lines perform multiple functions simultaneously. These lines are used both for controlling the fluid ejection process and for accessing memory data, effectively reducing the total number of required input/output pads while maintaining expanded data storage capability.
3Adaptability or versatility
If the number of signal pads is increased, then the signal transmission capability is improved, but the die space is occupied
Solution Approach 1:
The patent merges signal transmission functions into existing lines rather than adding separate dedicated lines for each function. The control and data lines are designed to carry multiple types of signals, including both fluid ejection control signals and memory data signals. This merging approach maintains robust signal transmission capability while preserving valuable die space.
Data Source
AI summary
An integrated circuit to drive a plurality of fluid actuation devices includes a fire line, a plurality of memory elements, a first switch, and a plurality of second switches. The first switch is electrically coupled between the fire line and a first side of each memory element of the plurality of memory elements. Each second switch is electrically coupled to a second side of a respective memory element of the plurality of memory elements.