An inkjet printer composes a first dot group including a first base dot group from ink dots of a first ink, and a second dot group including a second base dot group and a second additional dot group from ink dots of a second ink having a weaker color developing capability than the first ink. A total proportion of the first dot group with respect to the ink dots of the first ink is set to be a first print coverage greater than or equal to 100%. A total proportion of the second dot group with respect to the ink dots of the second ink is set to be a second print coverage greater than the first print coverage. Ink dots including the second additional dot group form a first print layer, and ink dots including the first base dot group and the second base dot group form a second print layer over or under the first print layer.

An inkjet printer composes a first dot group including a first base dot group from ink dots of a first ink, and a second dot group including a second base dot group and a second additional dot group from ink dots of a second ink having a weaker color developing capability than the first ink. A total proportion of the first dot group with respect to the ink dots of the first ink is set to be a first print coverage greater than or equal to 100%. A total proportion of the second dot group with respect to the ink dots of the second ink is set to be a second print coverage greater than the first print coverage. Ink dots including the second additional dot group form a first print layer, and ink dots including the first base dot group and the second base dot group form a second print layer over or under the first print layer.

A printing apparatus includes a printer with printing elements that print dots and a controller that controls the printer on the basis of input image data. The controller acquires a pre-correction printing density that is based on test pattern data, which includes a uniform array of pixels, and printing characteristics of a dot size of the printing elements. The controller calculates a target density by averaging the pre-correction printing density and offsets the target density so that the target density is equal to or greater than the pre-correction printing density. The controller calculates a correction gain of the printing elements on the basis of the ratio of the target density to the pre-correction printing density and controls the printer on the basis of the correction gain and the input image data.

A recording apparatus includes a recording head including a plurality of ink discharge ports arranged in a predetermined direction, and a complementing unit configured to, according to discharge defect information identifying a defective discharge port at which a discharge defect has occurred among the plurality of ink discharge ports, determine to cause provision of complementary ink to be conducted from a different discharge port configured to discharge the ink at a different position from the identified defective discharge port, wherein the complementing unit determines to use a discharge port configured to provide the ink at a position on one side that is one of positions adjacent in the predetermined direction to a position at which the at least one discharge port provides the ink as the different discharge port for the discharge port identified as the defective discharge port.

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.

In order to prevent streaks during the ink-jet paint coating of substrates, the invention provides a method for printing sheet-type substrates, in which a substrate (3) is moved in a feed direction (4) past an application device (7) by means of a conveying device (5) and during the movement of the substrate the application device (7) applies a fluid application material (9) drop by drop to the surface (30) of the substrate (3) in a pattern (14) with a pre-defined contour (15), in particular leaving out regions (16), through a plurality of ink-jet nozzles (70) arranged in a row transversely to the feed direction, in response to computer-controlled switching signals, wherein during the application of the pattern (14) and during the movement of the substrate (3) the ink-jet nozzles (70) are moved back and forth transversely to the feed direction (4), preferably in the longitudinal direction of the arranged row of ink-jet nozzles (70), such that the paths (72) traveled by the nozzles (70) over the substrate by the overlap of the movement back and forth with the movement in the feed direction (4) have direction components running perpendicular to the feed direction (4).

In order to prevent streaks during the ink-jet paint coating of substrates, the invention provides a method for printing sheet-type substrates, in which a substrate (3) is moved in a feed direction (4) past an application device (7) by means of a conveying device (5) and during the movement of the substrate the application device (7) applies a fluid application material (9) drop by drop to the surface (30) of the substrate (3) in a pattern (14) with a pre-defined contour (15), in particular leaving out regions (16), through a plurality of ink-jet nozzles (70) arranged in a row transversely to the feed direction, in response to computer-controlled switching signals, wherein during the application of the pattern (14) and during the movement of the substrate (3) the ink-jet nozzles (70) are moved back and forth transversely to the feed direction (4), preferably in the longitudinal direction of the arranged row of ink-jet nozzles (70), such that the paths (72) traveled by the nozzles (70) over the substrate by the overlap of the movement back and forth with the movement in the feed direction (4) have direction components running perpendicular to the feed direction (4).

A printing apparatus prints an image by applying ink to a print surface of an inclined print medium using a print head. A control apparatus for the printing apparatus acquires information on an inclination of the print surface. Based on the information, printing is controlled according to a print condition corresponding to a magnitude of the inclination of the print surface.

According to one example, a method may include determining a desired pattern of fluid to be applied to a substrate, controlling a first array of fluid applicators to apply fluid to the substrate to form a first portion of the pattern, in which an applicator of the first array of fluid applicators spans a section of the substrate that includes portions of the substrate both in and out of the pattern. The method may also include controlling the first array of fluid applicators to cause the applicator to not apply fluid to the section of the substrate and controlling a second fluid applicator to apply fluid to the section of the substrate, the second fluid applicator being separately movable from the first array of fluid applicators.

According to one example, a method may include determining a desired pattern of fluid to be applied to a substrate, controlling a first array of fluid applicators to apply fluid to the substrate to form a first portion of the pattern, in which an applicator of the first array of fluid applicators spans a section of the substrate that includes portions of the substrate both in and out of the pattern. The method may also include controlling the first array of fluid applicators to cause the applicator to not apply fluid to the section of the substrate and controlling a second fluid applicator to apply fluid to the section of the substrate, the second fluid applicator being separately movable from the first array of fluid applicators.