Printhead IC Protocol Adaptation for Controller Compatibility
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Solution Overview
Problem
Inkjet printers with pagewidth printheads face challenges in managing a large array of nozzles, including nozzle clogging and actuator burnout, which affect print quality, and require simplified replacement processes with minimized interconnections between the Print Engine Controller (PEC) and printhead.
Innovation Solution
A printhead IC designed to receive print data in various data transmission protocols, featuring open actuator test circuitry for defective nozzle detection, temperature sensors for viscosity compensation, and a reduced number of connections to the PEC, allowing for easier integration and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pagewidth printhead with a large array of nozzles is used, then print speed is improved, but the complexity of controlling the nozzle array increases
Solution Approach 1:
The pagewidth printhead is divided into multiple separate printhead ICs, each controlling a portion of the nozzle array. This segmentation allows the large control task to be distributed across multiple independent units, reducing the complexity of controlling the entire array while maintaining high print speed capability.
Solution Approach 2:
The printhead IC is designed with protocol selection circuitry that can adapt to multiple data transmission protocols (self-clocking and separate clock/data lines). This multi-functionality allows a single IC design to work with different PEC implementations, reducing overall system complexity.
2Adaptability or versatility
If different printhead IC designs are created for each PEC type, then compatibility with specific controllers is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The printhead IC incorporates protocol selection circuitry that can operate with multiple data transmission protocols (self-clocking and separate clock/data lines). This universal design allows a single IC to be compatible with different PEC types, eliminating the need for multiple specialized IC designs and simplifying manufacturing.
Solution Approach 2:
The IC dynamically selects which protocol to use based on the type of PEC it is connected to. This dynamic adaptability allows the same hardware design to work with different controllers without requiring manual configuration or multiple design variants.
3Ease of operation
If multiple interconnections are provided between PEC and printhead, then control capability is improved, but the replacement process becomes more complex
Solution Approach 1:
The reduced number of connections is achieved through universal protocol support that allows efficient data transmission with fewer physical interconnections. The protocol selection circuitry enables the IC to adapt to different connection schemes, maintaining control capability while minimizing the number of required connections for easier replacement.
Data Source
AI summary
A printhead IC for an inkjet printer, the inkjet printer having a PEC for sending print data to the printhead IC in accordance with a predetermined data transmission protocol, the printhead IC comprising: an array of nozzles for ejecting drops of printing fluid onto a media substrate; and, drive circuitry for driving the array of nozzles; wherein, the circuitry is configured to receive print data in any one of a plurality of different data transmission protocols.