Theodore A Sjodin

8125501, Feb 28, 2012

Apr 9, 2007

11/697967

Karl R. Amundson - Cambridge MA, US
Theodore A. Sjodin - Waltham MA, US
Chia-Chen Su - Cambridge MA, US
Demetrious Mark Harrington - Cambridge MA, US
Holly G. Gates - Somerville MA, US

E Ink Corporation - Cambridge MA

G06F 3/038

345690, 345 89

A method and system for applying addressing voltages to pixels of a display involves receiving input data. The input data includes an indication of an addressing voltage impulse to be applied to a pixel via an electrode. One or more voltage sources are selected, to provide the addressing voltage impulse. The one or more voltage sources each have a pre-selected voltage, The selected one or more voltage sources are electrically connected to an electrode to apply the addressing voltage impulse to the pixel. The invention also provides a method of driving an electro-optic display which uses an intermediate image of reduced bit depth, and a method of driving an electro-optic display which uses a limited number of differing drive voltages, with higher voltage pulses being used before lower voltage pulses.

8289250, Oct 16, 2012

Nov 7, 2007

11/936326

Robert W. Zehner - Belmont MA, US
Karl R. Amundson - Cambridge MA, US
Theodore A. Sjodin - Waltham MA, US
Holly G. Gates - Somerville MA, US

E INK Corporation - Cambridge MA

G09G 3/36

345 87, 345 89, 349168, 359296

A bistable electro-optic display is updated by writing an image on the display using a first drive scheme capable of driving pixels to multiple gray levels, and thereafter varied using a second drive scheme using only two gray levels, at least one of which is not an extreme optical state of the pixel.

8593396, Nov 26, 2013

Apr 13, 2011

13/086066

Karl R. Amundson - Cambridge MA, US
Robert W. Zehner - Los Gatos CA, US
Theodore A. Sjodin - Waltham MA, US

E Ink Corporation - Billerica MA

G09G 3/34

345107, 345208, 359296

Waveforms for driving electro-optic displays, especially bistable electro-optic displays, are modified by one or more of insertion of at least one balanced pulse pair into a base waveform; excision of at least one balanced pulse pair from the base waveform; and insertion of at least one period of zero voltage into the base waveform. Such modifications permit fine control of gray levels.

20030072525, Apr 17, 2003

Jun 27, 2002

10/183837

Theodore Sjodin - Waltham MA, US
Keith Kang - Hollis NH, US

G02B006/26
G02B006/32

385/031000, 385/033000

An optical apparatus has a laser, an optical fiber, and a guide piece located between the laser and the optical fiber. The laser, the optical fiber, and the guide piece each have a numerical aperature, the numerical aperatures being related so as to modify a multimode light beam passing from the laser to the fiber via the guide piece by preventing coupling of at least some higher order modes to the fiber. A method of enhancing bandwidth in a multi-mode fiber involves passing a light beam through a guide piece having a numerical aperature relationship relative to a laser from which it receives the light beam and a fiber to which it couples the light beam so as to modify modal properties of the light beam and increase bandwidth in a transceiver.

20050280626, Dec 22, 2005

Aug 13, 2005

11/161715

Karl Amundson - Cambridge MA, US
Robert Zehner - New York NY, US
Theodore Sjodin - Waltham MA, US

E INK CORPORATION - Cambridge MA

G09G003/34

345107000

Waveforms for driving electro-optic displays, especially bistable electro-optic displays, are modified by one or more of insertion of at least one balanced pulse pair into a base waveform; excision of at least one balanced pulse pair from the base waveform; and insertion of at least one period of zero voltage into the base waveform. Such modifications permit fine control of gray levels.

20090195568, Aug 6, 2009

Apr 14, 2009

12/423211

Theodore A. Sjodin - Waltham MA, US

E INK CORPORATION - Cambridge MA

G09G 5/10

345690

A bistable electro-optic display having a plurality of pixels each of which is capable of displaying at least three optical states, including two extreme optical states, is driven by the method comprising a first drive scheme capable of effecting transitions between all of the gray levels which can be displayed by the pixels; and a second drive scheme which contains only transitions ending at one of the extreme optical states of the pixels.

20110285754, Nov 24, 2011

Apr 11, 2011

13/083637

Demetrious Mark Harrington - Cambridge MA, US
Theodore A. Sjodin - Waltham MA, US
Robert W. Zehner - Belmont MA, US
Timothy J. O'Malley - Wakefield MA, US
Benjamin Harris Paletsky - Medford MA, US

E INK CORPORATION - Cambridge MA

G09G 5/10

345690

An electro-optic display uses first and second drive schemes differing from each other, for example a slow gray scale drive scheme and a fast monochrome drive scheme. The display is first driven to a pre-determined transition image using the first drive scheme, then driven to a second image, different from the transition image, using the second drive scheme. The display is thereafter driven to the same transition image using the second drive scheme; and from thence to a third image, different from both the transition image and the second image, using the first drive scheme.

20130194250, Aug 1, 2013

Jan 31, 2013

13/755111

E INK CORPORATION - Cambridge MA, US
Matthew J. Aprea - Wellesley MA, US
Kenneth R. Crounse - Somerville MA, US
Demetrious Mark Harrington - Dartmouth MA, US
Jason Lin - Malden MA, US
Theodore A. Sjodin - Lexington MA, US
Chia-Chen Su - Cambridge MA, US

E INK CORPORATION - Cambridge MA

G09G 3/34

345212, 345107

A variety of methods for driving electro-optic displays so as to reduce visible artifacts are described. Such methods include (a) applying a first drive scheme to a non-zero minor proportion of the pixels of the display and a second drive scheme to the remaining pixels, the pixels using the first drive scheme being changed at each transition; (b) using two different drive schemes on different groups of pixels so that pixels in differing groups undergoing the same transition will not experience the same waveform; (c) applying either a balanced pulse pair or a top-off pulse to a pixel undergoing a white-to-white transition and lying adjacent a pixel undergoing a visible transition; (d) driving extra pixels where the boundary between a driven and undriven area would otherwise fall along a straight line; and (e) driving a display with both DC balanced and DC imbalanced drive schemes, maintaining an impulse bank value for the DC imbalance and modifying transitions to reduce the impulse bank value.