Abstract: According to one embodiment, a controller performs processing when a magnetic head passes over a servo region. The processing includes acquiring a first burst demodulated signal by demodulating a first burst pattern, and acquiring a second burst demodulated signal by demodulating a second burst pattern. The processing includes interpolating a first correction value for a first demodulation position based on first correction values acquired from a first radial position and a second radial position. The processing includes interpolating a second correction value for the first demodulation position based on second correction values acquired from the first radial position and the second radial position. The processing includes correcting amplitude of the first burst demodulated signal by using the first interpolation correction value, and correct amplitude of the second burst demodulated signal by using the second interpolation correction value.

Abstract: Method for driving an electrophoretic display layer to color states having improved a* and/or b* values. The display layer includes an electrophoretic medium with first, second, third, and fourth types of particles. The first and third particles have charges of opposite polarity than the second and fourth particles. The first particles have greater charge magnitude than the third particles. The second particles have greater charge magnitude than the fourth particles. The method includes (a) applying a pre-push voltage pulse of the first polarity and a given amplitude to the display layer for a first time period to promote separation of the first and third particles; and (b) applying push-pull voltage pulses to the display layer for a second time period to drive the display to a color state of the third particles. The push-pull voltage pulses alternate between the first and second polarity with amplitudes greater than the given amplitude.

Abstract: Described are methods heterogeneous integration of epitaxial (crystalline) material onto a near field transducer (NFT) of a heat-assisted magnetic recording (HAMR) head in a way that promotes robustness and improved performance of the NFT. While constructing NFTs with plasmonic disks terminating in single crystal (epitaxial) pegs may be desirable, such pegs cannot be directly formed on the NFT, and heterogeneous integration can result in interfacial voids that interrupt thermal contact and lower structural robustness. As such, after heterogeneous integration of a highly crystalline peg, a portion of the peg is removed and backfilled to improve the interface while leaving a single crystal portion of the peg intact.

Abstract: According to one embodiment, a magnetic recording device includes a magnetic head, and a controller. The magnetic head including a first magnetic pole, a second magnetic pole, a magnetic element provided between the first magnetic pole and the second magnetic pole, a coil, a first terminal, and a second terminal. In the first operation, the controller is configured to supply a recording coil current to the coil while supplying a recording element current to the magnetic element. An absolute value of the recording coil current is equal to or greater than the coil current value. The recording element current is equal to or less than the first current value.

Abstract: A data storage device comprises a magnetic medium and a head configured to be actuated over the magnetic medium. The head comprises a write element and a write driver configured to generate a write current to be applied to the write element. The write driver comprises a data switch section configured to switchably output low-level signals and high-level signals, and a stationary cascode section configured to receive the low-level signals and high-level signals from the data switch section and to generate a cascode pass through current. The data switch section comprises low voltage CMOS devices and the stationary cascode section comprises high voltage CMOS devices.

Abstract: Provided are a computer program product, device, system, and method for single data band data storage. In one embodiment, a tape head module has an array of four servo transducer elements for each servo band of a tape and an array of reader/writer transducer elements extending over most of the width of the tape. In another embodiment, a data storage tape has a top servo band positioned adjacent a top edge guard band of the tape, a bottom servo band positioned adjacent a bottom edge guard band of the tape, and a single data band positioned between the top and bottom servo bands and configured to receive tracks of data written by a tape head wherein the single data band width extends over most of the tape width.

Abstract: High density storage solutions demand a preamplifier for a writer with a fast rise time. The quality and speed of the writer depend on the rise time of a write current waveform. To improve the rise time, an improved base driver is implemented at the base terminal of an output transistor of an H-bridge amplifier circuit. The improved base driver has a push-pull driver, a current mirror circuit, and an alternating current coupled signal path. The improved base driver can create a dip in the voltage at the base terminal during a transition edge of a data signal and increase the base to emitter voltage of the output transistor when the output transistor is turning on. The result is a boost in the output current that is driving the writer, which reduces the rise time significantly.

Abstract: A servo recording apparatus according to the present technology includes: a servo write head. The servo write head writes a first servo pattern and a second servo pattern to a plurality of servo bands of a magnetic tape, the first servo pattern and the second servo pattern being asymmetric with respect to a width direction of the magnetic tape, the magnetic tape being used in a data recording apparatus that includes a data write head disposed such that a longitudinal direction of the data write head is inclined with respect to the width direction of the magnetic tape by a first head azimuth angle.

Abstract: Described are recording heads for heat assisted magnetic recording that include a light delivery waveguide that delivers light for excitation of a near-field transducer, where the waveguide has a multilayer core. The multilayer core includes a top outer layer nearest to the near-field transducer that has a lower refractive index than an inner layer of multilayer core. The described waveguides having a multilayer core can improve NFT coupling efficiency, which in turn can allow the use of lower optical power density, and thus provide better reliability for recording head components such as the near-field transducer.

Abstract: Various illustrative aspects are directed to a data storage device, method, and one or more processing devices that are configured to perform a read operation by: concurrently reading first data from a first band of tracks on one or more disk surfaces and second data from a second band of tracks on the one or more disk surfaces; and combining the first data and the second data into a digital output of the read operation, wherein the reading the first data comprises moving a first one of two or more selected heads in a first radial direction of the one or more disk surfaces, and wherein the reading the second data comprises moving a second one of the two or more selected heads in a second radial direction of the one or more disk surfaces opposite the first radial direction.

Abstract: A display panel includes an active area; a fanout region; and a bonding region located on one side of the fanout region away from the active area. A driver chip is disposed in the bonding region. The driver chip includes a first side edge adjacent to the fanout region, a second side edge opposite to the first side edge, and two third side edges. The driver chip includes a plurality of output terminals disposed close to the first side edge. The display panel includes: a plurality of fanout lines located in the fanout region; and a plurality of gull-wing lines located in the bonding region. Part of the fanout lines extend from the fanout region to a region where the first side edge is located, and are electrically connected to the output terminals. Another part of the fanout lines are electrically connected to the output terminals via the gull-wing lines.

Abstract: The present disclosure describes aspects of a differential current-mode (iMode) driver for microwave-assisted magnetic recording (MAMR) application in hard-disk drives. In some aspects, an iMode driver circuitry employs a driver circuit coupled to power supply connections. The driver circuit is configured to provide a controlled differential bias current and includes separate source and sink output terminals. A MAMR sensor couples between the source and sink output terminals, through which the MAMR sensor receives the controlled differential bias current provided by the driver circuit. The MAMR sensor, which has a field-entry terminal and a field-exit terminal, generates microwave fields for the recording process. A common-mode feedback (CMFB) loop couples to the field-entry and field-exit terminals of the MAMR sensor, forming a feedback pathway with the driver circuit.

Abstract: A media library (10) includes a storage slot (218), a first target (218), a retrieval assembly (224), and a control system (260). The storage slot (218) is configured to receive and retain a media cartridge (20). The first target (250) is coupled to the storage slot (218). The retrieval assembly (224) is configured to move the media cartridge (20) into and out of the storage slot (218). The retrieval assembly (224) includes an assembly body (224A), an image capturing apparatus (246) that is coupled to the assembly body (224A), and a second target (248) that is coupled to the assembly body (224A). The control system (260) includes a processor that is configured to control operation of the retrieval assembly (224). When the retrieval assembly (224) is positioned near the storage slot (218), the image capturing apparatus (246) has a field of view (452) that captures both the first target (250) and the second target (248).

Abstract: A display device for use in displaying an augmented reality image of a real-world view or a virtual reality image to a user, the display device comprising an optical waveguide having an input optical element for receiving an image and at least one output optical element for outputting the image, a projector for generating the image, the projector being physically coupled to the optical waveguide, and a projector housing containing at least some components of the projector, the projector housing being relatively moveable with respect to the optical waveguide between a relative position in which a real-world view through the waveguide in the region of the at least one output optical element is occluded and a relative position in which the real-world view through the waveguide in the region of the at least one output optical element is not occluded.

Abstract: Systems, methods, and devices are provided in which photodetectors disposed throughout a display are used to control the display brightness. The photodetectors are to be used for ambient light sensing, proximity sensing, or to compensate for aging OLEDs. In some embodiments, photodiodes are fabricated with OLEDs during the TFT fabrication process. In some embodiments, the photodetectors may be disposed throughout the display in zones containing OLEDs. The photodetectors are used to control the display brightness and color for the OLEDs in areas around each photodetector based on ambient light, aging, and/or nearby objects. A controller makes driving strength adjustments to the OLEDs in each zone independent of other zones. Photodetectors disposed throughout the display may improve proximity sensing and provide additional functionality to the device.

Abstract: An OLED display device includes an OLED panel having a plurality of rows of pixels and a display logic module. The display logic module scans a first threshold voltage for each pixel in a first row of the pixels, skips a scan of a second threshold voltage for each pixel in a second number (m) of rows of pixels, and scans a third threshold voltage for each pixel in a third row (row m+1) of pixels. For each pixel in the second number (m) of rows, the display logic module interpolates a threshold voltage value between the first threshold voltage of an associated pixel in the first row and the third threshold voltage of an associated pixel in the third row. Here, m is greater than zero (0).

Abstract: A method of manufacturing hard disk drives (HDDs) includes assembling a first HDD including a first slider having a first air bearing surface (ABS) configuration, configuring the first HDD to rotate its disk media at a first revolutions-per-minute (RPM), and sealing the first HDD with a first internal pressure level. Continuing, the method includes assembling a second HDD including a second head slider having the same first ABS configuration, configuring the second HDD to rotate its disk media at a second RPM that is lower than the first RPM, and sealing the second HDD with a second internal pressure level that is higher than the first pressure level. Thus, in the context of using a common slider among different RPM drives, a higher internal pressure for the lower RPM drive can compensate for loss in fly height that might otherwise occur due to the lower operational RPM.

Abstract: A display apparatus includes a display panel, a touch layer, and a flexible printed circuit (FPC) including a main FPC and a bridge FPC. A third soldering region and a fourth soldering region of the bridge FPC are respectively soldered to a first soldering region and a second soldering region of the main FPC. Ends of each first touch connection line are electrically connected to a touch chip and a first touch lead. Ends of each second touch connection line are electrically connected to a pad on the second soldering region and a second touch lead. Ends of each third touch connection line are electrically connected to a pad on the first soldering region and the touch chip. Ends of each touch transfer line are electrically connected to a pad on the third soldering region and a pad on the fourth soldering region.

Abstract: A display panel and a display apparatus. The display panel comprises an electronic-paper display unit and a display control circuit. The display control circuit comprises a capacitor energy storage module, an antenna module, a control module and a comparator, wherein the antenna module is connected to the capacitor energy storage module, and charges the capacitor energy storage module in response to a radio-frequency signal; the control module is connected to the capacitor energy storage module and the electronic-paper display unit; the comparator is connected to the control module and the electronic-paper display unit; and when the voltage of the capacitor energy storage module is greater than a preset threshold voltage, power is supplied to the electronic-paper display unit.

Abstract: The present disclosure is generally related to a tape drive comprising a tape and a tape head. The tape drive comprises a processor configured to perform a disturbance profile identification detecting one or more disturbances along a length of a tape. The disturbance profile identification is used to create a peak filter array, which is used to instruct the piezoelectric and/or voice coil motor actuators to move the tape head to adjust a frequency of the disturbances. The peak filter array is further used to partition the tape into a plurality of zones based on a size of the peak filter array. Servo parameters of a servo head are then updated based on the peak filter array within each zone to adjust the control strategy specific to each zone. Utilizing the disturbance profile identification prevents track following capability loss against the dynamic lateral tape motion of the tape drive.