Tham khảo tài liệu 'features of liquid crystal display materials and processes part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Inkjet Printing of Microcomponents Theory Design Characteristics and Applications 49 Fig. 4. Right Illustration of inkjet printing platform mainly composed of the printhead cartridge movable stage CCD camera base gantry frame etc. Left enlarged portion of the platform for highlight of the inkjet printing area Bottom User interface window built by LabView in the controlling computer. filters Chen et al. 2010 by Industrial Technology Research Institute in Taiwan illustrates a common configuration primarily comprising the printhead cartridge substrate carrier movable stage and rotator CCD camera and microscopy base and gantry frame. With the printhead cartridge fixed on the gantry frame this platform can perform DOD inkjet printing algorithm by moving the motored stage to deliver the substrate in x-y coordinates so that the imaging pattern is online input and completed through a friendly user interface PC-based LabView . To achieve high quality inkjet printing however additional pre-printing procedures should be carried out in advance of actual inking the underlying substrates which includes the z-axis gap tuning between the nozzle plate to substrate surface cleaning of printhead nozzles alignment and calibration of homing coordinates in x-y axes Huang et al. 2009 whereas 50 Features of Liquid Crystal Display Materials and Processes special care is also paid for rotational registration if a large-area substrate . LCD color filter is to be printed here. After the full preparation of inkjet printing processes two major design issues of microfabrication associated with precise DVD implementation will be further addressed and explained below. 3. Design issues of microfabrication Positioning accuracy Because of the jet instability in microfluidic nature as demonstrated in Figures 2 and 3 most of droplets jetted from the nozzles exhibit slightly uncertain deviation of angle A0 . 1 from the normal direction of the horizontal plate. This uncertainty
