A jetting assembly for ejecting a print material includes an actuator for applying a pressure to the print material, and further includes jetting assembly block that defines a pump chamber, a converging part (i.e., a narrowing taper), and a nozzle bore that ends or terminates in a nozzle from which a drop of the print material is ejected. An implementation can further include a throat and a diverging part that, together with the converging part, forms a venturi. The converging part results in an increase in a velocity of the print material and a decrease in pressure as the print material passes an supply port of a supply channel. The decrease in pressure can result in a replacement of at least a portion of the drop volume within the throat or the nozzle bore even before the drop is ejected from the nozzle.

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.

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.

A liquid droplet measurement method and a liquid droplet measurement device with which the luminance contrast can be improved without making changes in, for example, the numerical aperture of a lens when the quantity of reflected light from the surface of the measurement target liquid droplet alone cannot provide a sufficient luminance contrast. A method and an apparatus for manufacturing a device are also provided. The liquid droplet measurement device includes: a measurement table having a surface with a recess and for holding a translucent sample substrate; an imaging section that applies light onto the sample substrate having formed thereon a liquid droplet, and measures quantities of reflected light from the sample substrate and the liquid droplet; and a measurement control unit that determines a volume or a surface shape of the liquid droplet using luminance information of the reflected light quantities measured by the imaging section.

A droplet discharge apparatus may include a droplet discharge unit configured to discharge droplets of a target substance stored in a tank at intervals through an opening of a nozzle connected to the tank, a speed sensor configured to measure the speed of a droplet discharged from the droplet discharge unit, and a calculation unit configured to calculate the volume of the target substance consumed per unit time, based on cross-sectional area of the opening of the nozzle and the speed of the droplet.

A fluidic die includes an array of nozzles, each nozzle to eject a fluid drop in response to a corresponding actuation signal having an actuation value. Nozzle select logic provides for each nozzle a nozzle select signal having a select value or a non-select value. Actuation logic provides the respective actuation signal for each nozzle, the actuation logic to receive one or more drop weight signals, and for each nozzle select signal having the select value, to provide an actuation signal having an actuation value to the corresponding nozzle and/or to one or more neighboring nozzles based on a state of the one or more drop weight signals.

A droplet forming device is provided. The droplet forming device includes a liquid holder configured to hold a liquid, a film having a discharge hole, two or more vibration generators configured to vibrate the film, and a driver configured to apply a driving signal to the vibration generators. One or more of the vibration generators are disposed in each region on the film where a polarity of bending moment differs.

In a device and a method for improving the print image uniformity, at least one print image is printed by a printer with at least one print bar that has at least one print head with a plurality of print nozzles. An image detector having a plurality of dot/image detection regions detects at least one value profile of measured inking intensities. A comparator compares the value profile with at least one reference value, and generates correction values dependent thereon.

An image forming apparatus 101 capable of performing printing with a high image quality, and a control method of the image forming apparatus 101 are provided. For this purpose, a threshold value Dt is preliminarily set that allows printing without occurrence of blur, for each of preliminarily set monitoring areas A. In the case where a print duty for each of the monitoring areas A has exceeded the threshold value Dt, an ejection frequency of ink and conveying speed of a print medium are reduced in association therebetween.

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.