Ink Jet Printing System Alignment and Discharge Correction
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Solution Overview
Problem
High-resolution display devices require precise discharge of chemical liquid onto dense pixel regions of substrates, which existing ink jet printing systems fail to achieve effectively.
Innovation Solution
An ink jet printing system with a printing section, a maintenance section, and a gantry that includes alignment marks, identification members, and a control member to accurately position the ink jet head and correct discharging points, ensuring precise chemical liquid deposition onto substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the substrate has more pixel regions per unit area to achieve high resolution, then the display device resolution is improved, but the precision of chemical liquid discharge becomes more difficult to achieve
Solution Approach 1:
The patent employs alignment marks detected by identification members to provide feedback on the actual position of pixel regions. The control member uses this feedback information to correct discharge points, ensuring precise chemical liquid deposition even on high-density substrates with numerous pixel regions per unit area.
Solution Approach 2:
The patent replaces purely mechanical positioning with an optical detection system. Identification members (such as cameras or sensors) detect alignment marks to determine precise positions, substituting mechanical measurement with optical field-based detection to achieve higher positioning accuracy for dense pixel regions.
2Measurement precision
If alignment marks and identification members are added to correct discharge points, then the discharge precision is improved, but the device complexity increases
Solution Approach 1:
The gantry structure serves multiple functions: it supports the ink jet head for chemical liquid discharge, carries identification members for detecting alignment marks, and provides a mounting structure for the alignment marks themselves. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
Alignment marks serve as intermediaries between the substrate's pixel regions and the identification members. These marks enable precise position detection without requiring direct complex interaction between the identification system and the dense pixel structures, simplifying the overall detection mechanism.
Data Source
AI summary
The ink jet printing system may have a printing section and a maintenance section. The ink jet printing system may include at least one first alignment mark disposed in the printing section along a first direction, an ink jet head for discharging chemical liquid onto a substrate, at least one second alignment mark disposed in the maintenance section along a second direction perpendicular to the first direction, at least one first identification member disposed proximate to the ink jet head, the at least one first identification member identifying the at least one first alignment mark and the at least one second alignment mark, a gantry extended from the printing section to the maintenance section, the gantry moving the ink jet head between the printing section and the maintenance section, at least one second identification member disposed proximate to the gantry, the at least one second identification member identifying discharging points of the chemical liquid in the maintenance section, and a control member for correcting discharging points of the chemical liquid discharged from the ink jet head onto the substrate in the printing section based on a result that the at least one second identification member identifies the discharging points in the maintenance section.