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SONY CORP (6758)
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Sony : Patent Application Titled "Display Unit and Method of Driving Display Unit, and Electronic Apparatus" Published Online (USPTO 20170337880)

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12/07/2017 | 06:28pm CET

By a News Reporter-Staff News Editor at Investment Weekly News -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors Nishiike, Akihito (Kanagawa, JP); Takanashi, Hidehiko (Kanagawa, JP); Oishi, Yuki (Kanagawa, JP), filed on November 5, 2015, was made available online on November 30, 2017.

The assignee for this patent application is Sony Corporation.

Reporters obtained the following quote from the background information supplied by the inventors: "In recent years, along with the widespread use of mobile apparatuses such as a mobile phone, a personal digital assistant (PDA), or any other similar apparatus, the demand for a display unit that provides the high-definition image quality at low power consumption has been growing. Recently, in association with the emergence of a delivery business of electronic books, the display unit having the display quality level suitable for the reading application has been desired.

"As such a display unit, various types of display units such as cholesteric liquid crystal, electrophoretic, electrochemical redox, twisting ball, and any other type are proposed, and a reflective display unit is favorable above all. This is because the reflective display unit carries out a bright display operation utilizing reflection (scattering) of outside light similarly to paper, thereby achieving the display quality level close to the paper.

"Among the reflective display units, an electrophoretic display unit utilizing an electrophoretic phenomenon achieves low power consumption and fast response rate. For example, an electrophoretic device with use of a fibrous structure that enables high contrast and high-speed response is proposed (PTL 2). A drive method of such an electrophoretic display unit includes an active-matrix drive method using TFTs (Thin-Film Transistors), and any other devices, a segment method that puts a display body provided between a pair of segmented electrodes to perform a drive operation on each electrode basis, or any other method. When many small characters are to be displayed like electronic books, high-definition images are desired, and thus the active-matrix drive method has been widely used.

"In driving the electrophoretic display unit, a voltage is applied in units of frames in the order of tens of milliseconds (frame period), and a single display switchover (write) operation is performed over a period of a plurality of frames (for example, tens of frames). Specifically, by applying each voltage of, for example, a positive-polarity voltage, a negative-polarity voltage, and 0 V in combination with one another, it is possible to represent white display (bright display), black display (dark display), or gray-scale display of the display unit.

"For example, in making a switchover from the black display to the white display, a voltage for white display (white display voltage) continues to be applied over a period of a plurality of consecutive frames. On the contrary, in making a switchover from the white display to the black display, a voltage for black display (black display voltage) continues to be applied over a period of a plurality of consecutive frames, thereby achieving the desired display state (for example, see PTL 1)."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "However, the drive method admits of improvement in terms of the optical response property of the electrophoretic display device at the time of the white display in particular. It is desired to achieve the drive method that allows for improvement of the display quality level including the enhanced reflectance as well as high-speed and bright display.

"Accordingly, it is desirable to provide a display unit and a method of driving such a display unit, and an electronic apparatus that allow for improvement of the display quality level.

"A first display unit according to one embodiment of the disclosure includes: an electrophoretic display device in which an optical reflectance varies on a time-series basis depending on an applied voltage; and a drive circuit that performs voltage drive of the electrophoretic display device. The drive circuit applies a first voltage directed to display to the electrophoretic display device over a period of one or more frames, and applies a second voltage that is different from the first voltage during one or more vertical blanking periods in the period of one or more frames.

"A second display unit according to one embodiment of the disclosure includes: an electrophoretic display device in which an optical reflectance varies on a time-series basis depending on an applied voltage; and a drive circuit that performs voltage drive of the electrophoretic display device. The drive circuit applies a first voltage directed to display to the electrophoretic display device over a period of one or more frames, and applies, in the period of one or more frames, a second voltage that is different from the first voltage on or after a first point of time at which a derivative value of the optical reflectance reaches a maximum magnitude.

"A first drive method according to one embodiment of the disclosure includes: applying a first voltage to an electrophoretic display device over a period of one or more frames to vary an optical reflectance of the electrophoretic display device on a time-series basis, the first voltage being directed to display; and applying, upon varying the optical reflectance of the electrophoretic display device on the time-series basis, a second voltage that is different from the first voltage during one or more vertical blanking periods in the period of one or more frames.

"A second drive method according to one embodiment of the disclosure includes: applying a first voltage to an electrophoretic display device over a period of one or more frames to vary an optical reflectance of the electrophoretic display device on a time-series basis, the first voltage being directed to display; and applying, upon varying the optical reflectance of the electrophoretic display device on the time-series basis and in the period of one or more frames, a second voltage that is different from the first voltage on or after a first point of time at which a derivative value of the optical reflectance reaches a maximum magnitude.

"An electronic apparatus according to one embodiment of the disclosure includes the above-described first display unit according to the embodiment of the disclosure.

"In the first display unit, the first drive method, and the electronic apparatus according to the respective embodiments of the disclosure, the optical reflectance of the electrophoretic display device is varied on a time-series basis by applying the first voltage to the electrophoretic display device over the period of one or more frames, resulting in transition to a display state (for example, white display) corresponding to the first voltage. The second voltage that is different from the first voltage is applied during one or more vertical blanking periods in the period of one or more frames. Consequently, in the electrophoretic display device, the optical response property is improved as compared with a case where the first voltage is only applied over the period of one or more frames, and the desired optical reflectance is achieved.

"In the second display unit and the second drive method according to the respective embodiments of the disclosure, the optical reflectance of the electrophoretic display device is varied on a time-series basis by applying the first voltage to the electrophoretic display device over the period of one or more frames, resulting in transition to a display state (for example, white display) corresponding to the first voltage. The second voltage that is different from the first voltage is applied, in the period of one or more frames, on or after the first point of time at which the derivative value of the optical reflectance reaches the maximum magnitude. Consequently, in the electrophoretic display device, the optical response property is improved as compared with a case where the first voltage is only applied over the period of one or more frames, and the desired optical reflectance is achieved.

"According to the first display unit, the first drive method, and the electronic apparatus of the respective embodiments of the disclosure, it is possible to perform display (for example, white display) corresponding to the first voltage in the electrophoretic display device by applying the first voltage to the electrophoretic display device over the period of one or more frames. The second voltage that is different from the first voltage is applied during one or more vertical blanking periods in the period of one or more frames, which makes it possible to achieve the desired optical reflectance in the electrophoretic display device. As a result, this allows the desired contrast ratio and brightness to be achieved. Further, by applying the second voltage during the vertical blanking period, it is possible to suppress instantaneous image flickering that may be caused by application of the second voltage. This allows for improvement of the display quality level.

"According to the second display unit and the second drive method of the respective embodiments of the disclosure, it is possible to perform display (for example, white display) corresponding to the first voltage in the electrophoretic display device by applying the first voltage to the electrophoretic display device over the period of one or more frames. The second voltage that is different from the first voltage is applied, in the period of one or more frames, on or after the first point of time at which the derivative value of the optical reflectance reaches the maximum magnitude, which makes it possible to achieve the desired optical reflectance in the electrophoretic display device. As a result, this allows the desired contrast ratio and brightness to be achieved. This allows for improvement of the display quality level.

"It is to be noted that the above descriptions are merely exemplified. The effects of the disclosure are not necessarily limitative, and effects of the disclosure may be other effects, or may further include other effects."

For more information, see this patent application: Nishiike, Akihito; Takanashi, Hidehiko; Oishi, Yuki. Display Unit and Method of Driving Display Unit, and Electronic Apparatus. Filed November 5, 2015 and posted November 30, 2017. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220170337880%22.PGNR.&OS=DN/20170337880&RS=DN/20170337880

Keywords for this news article include: Sony Corporation, Electronic Equipment Companies.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2017, NewsRx LLC

(c) 2017 NewsRx LLC, source Business Newsletters

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Financials ( JPY)
Sales 2018 8 601 B
EBIT 2018 -
Net income 2018 464 B
Finance 2018 823 B
Yield 2018 0,58%
P/E ratio 2018 14,94
P/E ratio 2019 14,67
EV / Sales 2018 0,69x
EV / Sales 2019 0,63x
Capitalization 6 770 B
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