Abstract:
A display apparatus (10) has at least one color channel providing a modulated light for each of a plurality of image frames (92). One or more laser sources that provide an illumination beam having a first polarization transmission axis. An imaging modulator (854, 85g, 85b) in the path of the illumination beam is actuable to direct the modulated light toward a projection lens. A laser blanking apparatus in the path of the modulated light is disposed to block transient light between image frames and has at least one analyzer (66) having a second polarization transmission axis that is orthogonal to the first polarization transmission axis and at least one light polarization modulator that is synchronously timed to rotate polarization of transient light during an interval between frames.
Abstract:
Drop formation devices are provided with a sequence of drop formation waveforms to modulate the liquid jets to selectively cause portions of the liquid jets to break off into print drops having a print drop volume Vp and non-print drops having a non-print drop volume Vnp. The print and non-print drop volumes are distinct from each other. A timing delay device shifts the timing of drop formation waveforms supplied to drop formation devices of first and second nozzle groups so that print drops from the first and second nozzle groups are not aligned relative to each other. A charging device includes a charge electrode that is positioned in the vicinity of break off of liquid jets to produce a print drop charge state on drops of volume Vp and to produce a non-print drop charge state on drops of volume Vnp.
Abstract:
A liquid dispenser includes a downwardly inclined slide surface. A carrier liquid dispensing channel includes an outlet that exits onto the downwardly inclined slide surface. A carrier liquid source provides a carrier liquid that flows continuously through the carrier liquid dispensing channel, through the outlet of the carrier liquid dispensing channel, and down the downwardly inclined slide surface. A functional liquid supply channel includes an outlet that exits onto the downwardly inclined slide surface. A functional liquid source provides a functional liquid to the outlet of the functional liquid supply channel. A drop formation device, associated with an interface of the outlet of the functional liquid supply channel and the downwardly inclined slide surface, is selectively actuated to form a discrete drop of the functional liquid in the carrier liquid flowing down the downwardly inclined slide surface. The functional liquid is immiscible in the carrier liquid.
Abstract:
An apparatus for obtaining an image of a tooth having at least one light source providing incident light having a first spectral range for obtaining a reflectance image from the tooth and a second spectral range for exciting a fluorescence image from the tooth. A polarizing beamsplitter in the path of the incident light from both sources directs light having a first polarization state toward the tooth and directs light from the tooth having a second polarization state along a return path toward a sensor, wherein the second polarization state is orthogonal to the first polarization state. A first lens in the return path directs image-bearing light from the tooth toward the sensor, and obtains image data from the portion of the light having the second polarization state. A long-pass filter in the return path attenuates light in the second spectral range.
Abstract:
A liquid ejection system ejects a liquid jet through a nozzle. A drop formation device modulates the jet causing portions to break off into drop pairs, including first and second drops, separated on average by a drop pair period, and modulates the jet to cause portions to break off into larger third drops separated on average by the same period. A charging device includes a varying electrical potential source providing a waveform including first and second distinct voltage states and a period equal to the drop formation period. The charging device and the formation device are synchronized to produce first, second, and third charge to mass ratios on the first, second, and third drops, respectively. A deflection device causes the first, second, and third drops to travel along first, second, and third paths, respectively. The first and third charge to mass ratios and paths are substantially the same.
Abstract:
A method of ejecting liquid drops includes providing liquid under pressure sufficient to eject a liquid jet through a nozzle of a liquid chamber. The liquid jet is modulated to cause portions of the liquid jet to break off into a series of drop pairs traveling along a path using a drop formation device. Each drop pair is separated in time on average by the drop pair period. Each drop pair includes a first drop and a second drop. A charging device is provided that includes a charge electrode associated with the liquid jet and a source of varying electrical potential between the charge electrode and the liquid jet. The source of varying electrical potential provides a waveform that includes a period that is equal to the drop pair period. The waveform also includes a first distinct voltage state and a second distinct voltage state. The charging device is synchronized with the drop formation device to produce a first charge state on the first drop and to produce a second charge state on the second drop. A relative velocity of a first drop and a second drop of a selected drop pair is varied using a drop velocity modulation device to control whether the first drop and the second drop of the selected drop pair combine with each other to form a combined drop. The combined drop has a third charge state. A deflection device is used to cause the first drop having the first charge state to travel along a first path, to cause the second drop having the second charge state to travel along a second path, and to cause the combined drop having the third charge state to travel along a third path.
Abstract:
A method for displaying first and second stereoscopic images to first and second viewers provides the first viewer with a first decoding device having a first viewer differentiating element for receiving the first stereoscopic image and further having a first left- and right-eye differentiating elements for separating left- and right-eye images. The second viewer is provided with a second decoding device having a second viewer differentiating element for receiving the second stereoscopic image and further having a second left- and right-eye differentiating element. The first stereoscopic image is displayed to the first viewer by forming a first left-eye image and forming a first right-eye image, each over substantially half of the refresh period. The second stereoscopic image is displayed to the second viewer by forming a second left-eye image and forming a second right-eye image, each over substantially half of the refresh period.
Abstract:
A projection display surface for reducing speckle artifacts from a projector having at least one narrow band light source having an incident visible wavelength band, wherein the incident visible wavelength band has an incident peak wavelength and an incident bandwidth, comprising: a substrate having a reflective layer that reflects incident light over at least the incident visible wavelength band; and a fluorescent agent distributed over the reflective layer, wherein the fluorescent agent absorbs a fraction of the light in the incident visible wavelength band and emits light in an emissive visible wavelength band having an emissive peak wavelength and an emissive bandwidth; wherein return light from the projection display surface produced when incident light in the incident visible wavelength band is incident on the projection display surface contains light in both the incident visible wavelength band and emissive visible wavelength band, thereby reducing speckle artifacts.
Abstract:
An electromechanical system and a printer for maintaining a peel location of media impressed on a receiving substrate. A mounted optical probe has at least one light source and one or more photodetectors for detecting reflected portions of the light emitted or transmitted from the light source. The photodetector indicates to the system controller a distance of the media for controlling a peel location via an electrical signal. A comparator compares the electrical signal with a predetermined electrical signal reference to determine if the media is desirably positioned. The predetermined electrical reference signal corresponds to the desired peel location. The comparator compares the signal levels and outputs a correction signal used in a negative feedback loop for adjusting a velocity of a motor that drives a take-up roller for the media.
Abstract:
A method for improving image contrast for a display apparatus obtains a frame of image data having one or more code values for each pixel in the frame of image data, analyzes the frame of image data to identify a distribution of dark regions therein. The method further adjusts at least one of the one or more code values for the frame of image data according to the distribution of dark regions in the frame of image data and attenuates a brightness level available for the image frame according to the distribution of dark regions in the frame of image data.