Patents by Inventor Tulasi Sridhar Reddy Guntaka

Tulasi Sridhar Reddy Guntaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10365472
    Abstract: A display device includes a first support plate and a first pixel region on the first support plate. The first pixel region includes a first sub-pixel and a second sub-pixel. A specular reflector is positioned within the first pixel region and associated with the first sub-pixel and a diffuse reflector is positioned within the first pixel region and associated with the second sub-pixel.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: July 30, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Tulasi Sridhar Reddy Guntaka, Henricus Petronella Maria Derckx
  • Patent number: 10365471
    Abstract: A display device includes a bottom support plate and an opposing top support plate. A pixel region is positioned between the bottom support plate and the top support plate. The pixel region includes a plurality of sub-pixels. A color filter layer is positioned within the pixel region. The color filter layer includes a plurality of color filters, wherein each color filter is positioned within a respective sub-pixel. A diffusion layer is positioned on a first surface of the top support plate between the top support plate and the color filter layer.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: July 30, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Erno Hermanus Antonius Langendijk, Tulasi Sridhar Reddy Guntaka, Kari Juhani Rinko
  • Patent number: 10338374
    Abstract: A display device includes a first support plate and an opposing second support plate. A pixel region is between the first support plate and an inner surface of the second support plate. A diffuser is disposed on the second support plate. The diffuser has a first diffusion area over the pixel region. The first diffusion area has a first region with a first diffusion profile and a second region with a second diffusion profile.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: July 2, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Tulasi Sridhar Reddy Guntaka, Karel Johannes Gerhardus Hinnen
  • Patent number: 10310251
    Abstract: A system and method for a display device are presented. The display device includes a first support plate. A wall is over the first support plate. The wall is associated with an electrowetting pixel. The wall is configured to allow for the propagation of light having a wavelength within a first range of wavelengths and prevents propagation of light having a second wavelength in a second range of wavelengths. A color filter is positioned over the electrowetting pixel. The color filter allows propagation of light having the wavelength within the first range of wavelengths and preventing propagation of light having the second wavelength within the second range of wavelengths.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: June 4, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Gor Manukyan, Tulasi Sridhar Reddy Guntaka
  • Patent number: 10274720
    Abstract: A display device includes a first support plate and an opposing second support plate. A first pixel region between the first support plate and the second support plate includes a first thin film transistor (TFT) structure over the first support plate. A second pixel region between the first support plate and the second support plate and adjacent the first pixel region includes a second TFT structure over the first support plate. A first pixel wall portion is positioned over the first support plate between the first pixel region and the second pixel region such that each of the first TFT structure and the second TFT structure is positioned adjacent the first pixel wall portion. A light-blocking portion is disposed on an inner surface of the second support plate and positioned over the first TFT structure and the second TFT structure.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: April 30, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Toru Sakai, Tulasi Sridhar Reddy Guntaka, Karel Johannes Gerhardus Hinnen
  • Patent number: 10262601
    Abstract: An electrowetting display device includes a first support plate and a second support plate. The first support plate has rows and columns of pixel walls defining individual electrowetting pixels. A first fluid and a second fluid immiscible with the first fluid are between the first support plate and the second support plate. A sensor is coupled to the second support plate and configured to detect a first intensity of light incident upon the second support plate at a first angle. A controller is configured to displace the first fluid in either a first direction or a second direction based at least in part upon the first intensity of light detected by the sensor.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: April 16, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Tulasi Sridhar Reddy Guntaka, Pavel Novoselov, Gor Manukyan
  • Patent number: 10234677
    Abstract: An electrowetting display device includes light steering structures that direct incoming light away from pixel walls. According to some configurations, transparent or semi-transparent pixel walls are shielded from incoming light by a black matrix (BM) material in a color filter plate and by the light steering structures. Instead of the incoming light being completely blocked by the black matrix, at least a portion of the incoming light that would have been blocked by the black matrix is directed by one or more of the light steering structures to an area of the pixel such that the brightness of the pixel is increased.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: March 19, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Tulasi Sridhar Reddy Guntaka, Karel Johannes Gerhardus Hinnen
  • Patent number: 10139616
    Abstract: A display element comprising a configurable medium for providing a display effect. The display element is for example an electrowetting element having a first fluid and a second fluid. A first support plate comprises a first support plate surface in contact with at least one of the first fluid or the second fluid, and an electrode. In some examples, an optical structure comprises a first absorbent element and a second absorbent element, with a transmissive layer located therebetween. In other examples, an optical structure comprises a plurality of light conduits.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: November 27, 2018
    Assignee: Amazon Technologies, Inc.
    Inventors: Karel Johannes Gerhardus Hinnen, Tulasi Sridhar Reddy Guntaka
  • Patent number: 10133058
    Abstract: A method for fabricating an electrowetting display may include forming pixel electrodes on a support plate; depositing a first layer on the pixel electrodes; etching portions of the first layer to form pixel walls that partition pixel regions; depositing a second layer on the pixel electrodes and the pixel walls; etching portions of the second layer to form spacers on tops of the pixel walls; and depositing a hydrophobic layer to at least partially cover the pixel electrodes.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: November 20, 2018
    Assignee: Amazon Technologies, Inc.
    Inventors: Pavel Novoselov, Gor Manukyan, Tulasi Sridhar Reddy Guntaka
  • Patent number: 10120184
    Abstract: Subject matter disclosed herein relates to improving luminance and reducing color shifts in electrowetting displays. The electrowetting display comprises a plurality of electrowetting elements separated by partition walls and spacers. The spacers and/or partition walls are reflective. When incident light that enters a pixel or subpixel is reflected and encounters a spacer and/or partition wall, the light is reflected such that the reflected light exits the pixel or subpixel into which the incident light entered. This improves luminance and reduces color shifts of the electrowetting display.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: November 6, 2018
    Assignee: Amazon Technologies, Inc.
    Inventors: Erno Hermanus Antonius Langendijk, Christian Etienne Hendriks, Tulasi Sridhar Reddy Guntaka, Steven Ramos Carneiro, Pavel Novoselov
  • Patent number: 10067336
    Abstract: A method for fabricating an electrowetting display may include depositing a first material layer on a support plate; placing a first mask on the first material layer, wherein the first mask covers first portions of the first material layer and does not cover second portions of the first photoresist layer; exposing second portions of the first material layer to electromagnetic radiation; depositing a second material layer on the first mask and the exposed second portions of the first material layer; placing a second mask on the second material layer; and etching to remove portions of the second material layer and the second portions of the first material layer. Portions of the first and second material layers that remain subsequent to the etching form spacers and a grid of pixel wall extensions.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: September 4, 2018
    Assignee: Amazon Technologies, Inc.
    Inventors: Pavel Novoselov, Gor Manukyan, Tulasi Sridhar Reddy Guntaka
  • Patent number: 10048486
    Abstract: A display device includes a first support plate. A pixel region is formed on the first support plate and a reflective layer is positioned in the pixel region. The reflective layer includes a specular reflector and a diffuse reflector.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: August 14, 2018
    Assignee: AMAZON TECHNOLOGIES, INC.
    Inventors: Steven Ramos Carneiro, Tulasi Sridhar Reddy Guntaka, Henricus Petronella Maria Derckx, Pavel Novoselov
  • Patent number: 10001639
    Abstract: An electrowetting display comprises a support plate on which individual electrowetting pixels separated from one another by pixel walls are formed. Pixel walls including different layers are disposed on the first support plate and separate adjacent pixel regions from each other. The first layer of a pixel wall comprises a first material having a first color and a second layer of the pixel wall comprises a second material having a second color that is different from the first color. Instead of using black matrix to reduce photo crosstalk, the pixel walls of the different layers absorb light colors that are not intended to reach the respective pixels. A fluid is disposed between the first support plate and a second support plate and at least partially surrounds the first wall and the second wall.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: June 19, 2018
    Assignee: Amazon Technologies, Inc.
    Inventors: Tulasi Sridhar Reddy Guntaka, Karel Johannes Gerhardus Hinnen, Gor Manukyan
  • Patent number: 9977233
    Abstract: An electrowetting display comprises a first support plate, a second support plate substantially parallel to the first support plate, an electrolyte solution disposed between the first support plate and the second support plate, and a plurality of transparent diffuser elements protruding into the electrolyte solution from non-contiguous areas of the second support plate. Recesses separate the transparent diffuser elements.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: May 22, 2018
    Assignee: AMAZON TECHNOLOGIES, INC.
    Inventors: Toru Sakai, Tulasi Sridhar Reddy Guntaka
  • Patent number: 9953589
    Abstract: An electrowetting display device may comprise pixels that include: a hydrophobic layer portion disposed on a first electrode, electrowetting fluids overlying the hydrophobic layer portion, and a thin film transistor (TFT) that is in electrical contact with the first electrode. The electrowetting display device also comprises a display control circuit in electrical contact with a drain or a source of the TFT of each of the pixels to provide a drive voltage to the drain or the source of the TFT of each of the pixels, and a reset control circuit in electrical contact with the drain or the source of the TFT of each of the pixels to provide a reset voltage pulse to the drain or the source of the TFT of each of the pixels. A magnitude of the reset voltage pulse may be based, at least in part, on the drive voltage.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: April 24, 2018
    Assignee: AMAZON TECHNOLOGIES, INC
    Inventors: Pavel Novoselov, Steven Ramos Carneiro, Henricus Petronella Maria Derckx, Tulasi Sridhar Reddy Guntaka
  • Patent number: 9841595
    Abstract: An electrowetting element comprises a first fluid and a second fluid immiscible with the first fluid. A support plate includes a support plate surface in contact with at least one of the first or second fluids. The support plate includes an electrode for applying a voltage to control a configuration of the first and second fluids and a reflective surface. A first layer positioned between the reflective surface and the support plate surface has a first layer optical thickness substantially equal to a quarter multiple of a reference wavelength.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: December 12, 2017
    Assignee: AMAZON TECHNOLOGIES, INC.
    Inventors: Karel Johannes Gerhardus Hinnen, Gerben Boon, Cristina Maria Petcu, Tulasi Sridhar Reddy Guntaka, Erno Langendijk
  • Patent number: 9823462
    Abstract: Instead of using a clear or a semi-transparent notch within an electrowetting display, a colored notch that is the same color of the pixel region extends from one of the pixel walls toward an opposing pixel wall of the pixel region. The colored notches follow a non-flipped arrangement within each of the pixel regions. For example, each colored notch is adjacent to the same respective pixel wall for a pixel region. In other configurations, the colored notches follow a flipped arrangement within each of the pixel regions. For example, a colored notch of one pixel region and a colored notch of another pixel region are adjacent to the same pixel wall (on opposing sides). Instead of including a separate white sub pixel for each pixel, each pixel region is at least partially covered by a white color filter and a color filter that is the color of the pixel.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: November 21, 2017
    Assignee: Amazon Technologies, Inc.
    Inventors: Tulasi Sridhar Reddy Guntaka, Karel Johannes Gerhardus Hinnen, Gor Manukyan
  • Patent number: 9684161
    Abstract: Subject matter disclosed herein relates to improving luminance and reducing color shifts in electrowetting displays. The electrowetting display comprises a plurality of electrowetting elements separated by partition walls and spacers. The spacers and/or partition walls are reflective. When incident light that enters a pixel or subpixel is reflected and encounters a spacer and/or partition wall, the light is reflected such that the reflected light exits the pixel or subpixel into which the incident light entered. This improves luminance and reduces color shifts of the electrowetting display.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: June 20, 2017
    Assignee: Amazon Technologies, Inc.
    Inventors: Erno Hermanus Antonius Langendijk, Christian Etienne Hendriks, Tulasi Sridhar Reddy Guntaka, Steven Ramos Carneiro, Pavel Novoselov
  • Publication number: 20170004779
    Abstract: An electrowetting display device may comprise pixels that include: a hydrophobic layer portion disposed on a first electrode, electrowetting fluids overlying the hydrophobic layer portion, and a thin film transistor (TFT) that is in electrical contact with the first electrode. The electrowetting display device also comprises a display control circuit in electrical contact with a drain or a source of the TFT of each of the pixels to provide a drive voltage to the drain or the source of the TFT of each of the pixels, and a reset control circuit in electrical contact with the drain or the source of the TFT of each of the pixels to provide a reset voltage pulse to the drain or the source of the TFT of each of the pixels. A magnitude of the reset voltage pulse may be based, at least in part, on the drive voltage.
    Type: Application
    Filed: June 30, 2015
    Publication date: January 5, 2017
    Inventors: Pavel Novoselov, Steven Ramos Carneiro, Henricus Petronella Maria Derckx, Tulasi Sridhar Reddy Guntaka
  • Patent number: 9529189
    Abstract: Subject matter disclosed herein relates to improving luminance and reducing color shifts in electrowetting displays. The electrowetting display comprises a plurality of electrowetting elements separated by partition walls and spacers. The spacers and/or partition walls are reflective. When incident light that enters a pixel or subpixel is reflected and encounters a spacer and/or partition wall, the light is reflected such that the reflected light exits the pixel or subpixel into which the incident light entered. This improves luminance and reduces color shifts of the electrowetting display.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: December 27, 2016
    Assignee: Amazon Technologies, Inc.
    Inventors: Erno Hermanus Antonius Langendijk, Christian Etienne Hendriks, Tulasi Sridhar Reddy Guntaka, Steven Ramos Carneiro, Pavel Novoselov