Abstract:
A droplet measurement system (DMS) is used in concern with an industrial printer used to fabricate a thin film layer of a flat panel electronic device. A clear tape serves as a printing substrate to receive droplets from hundreds of nozzles simultaneously, while an optics system photographs the deposited droplets through the tape (i.e., through a side opposite the printhead). This permits immediate image analysis of deposited droplets, for parameters such as per-nozzle volume, landing position and other characteristics, without having to substantially reposition the DMS or printhead. The tape can then be advanced and used for a new measurement. By providing such a high degree of concurrency, the described system permits rapid measurement and update of droplet parameters for printers that use hundreds or thousands of nozzles, to provide a real-time understanding of per-nozzle expected droplet parameters, in a manner that can be factored into print planning.
Abstract:
An optical imaging system for use with an infusion tube including: at least one light source for emitting at least two of first, second, or third spectrums of light; an optics system including a single lens for receiving and transmitting at least two of the first spectrum light transmitted through a first portion of the chamber, the second spectrum light transmitted through a second portion of the chamber, or the third spectrum light transmitted through a third portion of the chamber. The system includes a sensor receiving the at least two of the spectrums from the lens and generating and transmitting data characterizing the at least two of the spectrums. The system includes a memory element storing computer readable instructions and a processor to execute the instructions to generate, using the data, at least two of first, second, or third images of the first, second, and third portions, respectively.
Abstract:
A system and method for testing printheads is disclosed. The system comprises an optical sensor mounted on a movable carriage. The optical sensor is moved past a nozzle to be tested on the printhead while the nozzle ejects ink. The output signal of the optical sensor can be used to determine when the trajectory of the ejected ink is improper.
Abstract:
The present invention provides methods and apparatus for controlling the quantity of fluid output (e.g., drop size) by individual nozzles of a print head to a very high precision at a frequency equal to the frequency at which fluid is normally dispensed. This is achieved by mapping fluid quantity control information into the data that represents the image to be printed. Data representative of an image is received and converted into pixel data. In at least one embodiment, the pixel data includes pixels represented by N bits, and the N bits may represent a drop size for the pixel and a union of the N bits may represent a nozzle status. A print head may be controlled based on the pixel data, and the print head may include nozzles that are each adapted to deposit at least one drop size quantity of a fluid on a substrate.
Abstract:
This invention generally relates to the deposition of material for electronic devices, particularly molecular electronic devices such as organic light emitting diodes, by an ink jet-type process. The invention is particularly concerned with droplet, volume measurement and calibration techniques and deposition methods.A method of determining the volume of a droplet of fluid ejected from an orifice of a print head of an ink jet-type printing apparatus is described. The method comprises controlling the print head to eject a plurality of droplets from said orifice such that said droplets combine in flight to form a single, larger droplet; determining the volume of said larger droplet by measuring said larger droplet; and determining the volume of one of said plurality of ejected droplets using said determined volume of said larger droplet.
Abstract:
A method for detecting the volume (Vol) of the droplets of ink (22) ejected by a thermal ink jet printhead (11), comprising a continuous driving cycle during which one or more thermal ejection actuators (17) of the printhead (11) are driven in pulsing fashion with a driving energy (Ep) progressively increasing from a condition where no droplets are ejected, while the printhead (11) is maintained at a substantially constant stabilization temperature (Ts), notwithstanding the progressive increase in driving energy (Ep), by means of a heat control member (28) which absorbs and dissipates an appropriate feedbak energy (Er) in the printhead (11); wherein the quantities, correlated to each other in the course of the continuous driving cycle, of respectively the driving energy (Ep) fed to the ejection actuator (17) and the feedback energy (Er) absorbed and dissipated by the heat control member (28), to maintain the printhead (11) at the stabilization temperature (Ts), are acquired for the purpose of defining an experimental characteristic (50) representative of the continuous driving cycle, and in which the two linear end portions (51, 53) of this characteristic (50) are compared with each other in order to calculate, on the basis of their reciprocal deviation ( DELTA Ep), the volume (Vol) of the droplets of ink (22) ejected by the ink jet printhead (11).
Abstract:
The uniformity of performance of inkjet nozzles within a print head containing a plurality of said nozzles is optimized by characterizing one or more performance attributes of the nozzles within said print head. A waveform set is generated that comprises a plurality of waveforms to compensate for variations of the one or more performance attributes among the nozzles. One of the waveforms within the waveform set is assigned to each nozzle to optimize the one or more performance attributes of each nozzle relative to each other nozzle in the print head. Based upon the waveform assigned to each nozzle, each nozzle in the print head responds substantially uniformly relative to each other nozzle in the print head.
Abstract:
A droplet of fluid having a predetermined drop weight is ejected from a microfluidic channel. Electrical signals are received from a sensor in the microfluidic channel, wherein the electrical signals vary in response to the ejection of the droplet of fluid. The electrical signals of the sensor are calibrated to a rate of flow of fluid through the microfluidic channel based on a number of droplets ejected and the predetermined drop weight of each droplet.
Abstract:
In an example, a piezoelectric printhead assembly includes a micro-electro mechanical system (MEMS) die including a plurality of nozzles. An application-specific integrated circuit (ASIC) die is coupled to the MEMS die by a plurality of wire bonds, wherein each of the wire bonds corresponds to a respective nozzle of the plurality of nozzles. An arbitrary data generator (ADG) on the ASIC is to provide a digital data sequence, and a phase selector is to enable multiple data read operations of the ADG to generate multiple delayed digital data sequences.