An inkjet printer and a method thereof is disclosed. The inkjet printer, for fabricating an organic light-emitting diode device, includes a printing control apparatus, a main printing apparatus, a volume detection apparatus, and a compensation printing apparatus. The volume detection apparatus is capable of detecting volume and printing locations of a printing solution which needs to be compensated as soon as a main printing apparatus carrying out a primary printing, so that the compensation printing apparatus is capable of carrying out a compensation printing on the printing solution which needs printing compensation.

An inkjet printer and a method thereof is disclosed. The inkjet printer, for fabricating an organic light-emitting diode device, includes a printing control apparatus, a main printing apparatus, a volume detection apparatus, and a compensation printing apparatus. The volume detection apparatus is capable of detecting volume and printing locations of a printing solution which needs to be compensated as soon as a main printing apparatus carrying out a primary printing, so that the compensation printing apparatus is capable of carrying out a compensation printing on the printing solution which needs printing compensation.

In a method of inspecting liquid chemicals discharged from an ink jet head according to example embodiments, at least two laser beams may be irradiated onto the liquid chemicals discharged from the ink jet head, and the conditions of the liquid chemicals may be identified by detecting an interference pattern obtained from a laser scattering generated by passing the liquid chemicals through the at least two laser beams.

There is disclosed a housing including a plurality of compartments for housing a plurality of LEDs or photo detectors. Each compartment has a number of control pads projecting inwardly and a number of protrusions. The control pads are configured to provide a contact surface for the LEDs or photo detectors to control the alignment and position of each of the plurality of LEDs or photodiodes within each of the plurality of compartments. Each of the protrusions urges each of the plurality of LEDs or photodiodes against the respective control pads to control the alignment of the LEDs or photodiodes in the housing. A detector array including a casing, an LED housing and a photodiode housing is also disclosed.

An ink printing process employs per-nozzle droplet volume measurement and processing software that plans droplet combinations to reach specific aggregate ink fills per target region, guaranteeing compliance with minimum and maximum ink fills set by specification. In various embodiments, different droplet combinations are produced through different printhead/substrate scan offsets, offsets between printheads, the use of different nozzle drive waveforms, and/or other techniques. These combinations can be based on repeated, rapid droplet measurements that develop understandings for each nozzle of means and spreads for expected droplet volume, velocity and trajectory, with combinations of droplets being planned based on these statistical parameters. Optionally, random fill variation can be introduced so as to mitigate Mura effects in a finished display device. The disclosed techniques have many possible applications.

An imprint apparatus, comprises: a discharge unit that discharges a liquid onto a substrate; a storage unit that stores a plurality of discharge conditions for the discharge unit; and a control unit that controls the discharge unit based on a discharge condition that is stored in the storage unit, wherein the control unit selects the discharge condition from the plurality of discharge conditions in accordance with a discharge spacing for discharging the liquid.

A printer includes a print head to print a pixel by ejecting drops of a printing fluid from the print head, and a controller. The controller monitors a drop volume of the printing fluid ejected by the print head. When the drop volume is below a threshold, the controller controls the print head in accordance with a first print mode to increase the frequency of ejecting drops of the printing fluid within the pixel print time with a decrease in the drop volume that maintains a print quality parameter. The controller changes to a second print mode to increase the pixel print time that maintains the print quality parameter.

A detecting device is configured to detect a discharge state of droplets from a discharging head configured to discharge droplets onto a medium. A detecting device includes an irradiation unit configured to irradiate the medium on which a predetermined pattern is recorded with the droplets with irradiation light, and to scan the medium with the irradiation light in a scanning direction, a light-receiving unit configured to receive reflected light which is the irradiation light reflected by the medium, and to output a signal indicating intensity of the reflected light, and a control unit configured to perform determination process for determining a discharge state of the droplets onto the medium by using intensity change of the reflected light in scanning the predetermined pattern in the scanning direction.

A printing system and method of inspecting drop ejection in a printing system is disclosed. The method includes capturing an image of each of a plurality of drops of a print material after ejection from an ejector of a printing system, creating a temporally averaged image from each image of the plurality of drops of print material, and classifying one of the plurality of drops of print material based on the temporally averaged image that was created. The use of a pretrained convolutional neural network for classifying one of the plurality of drops and comparing the temporally averaged image to another temporally averaged image to classify one of the plurality of drops may be employed. The printing system also includes a camera with a high-speed shutter where the shutter is synchronized to an ejector pulse, and a video analytic framework coupled to the ejector and the camera configured to generate a jetting result for each of the one or more drops of liquid print material.

An inkjet printing apparatus includes a head, a platen, a platen absorbent that temporarily stores ink ejected from the head, a waste ink storage container that stores the ink discharged from the platen absorbent, and an estimation unit that, in a case where the platen is divided into a plurality of regions in a direction intersecting a conveyance direction of the printing medium, estimates an amount of ink stored in the waste ink storage container based on a position of a region to which the ink is ejected by the head and an amount of ink ejected to the region.