Amazon Technologies, Inc.

Steven Ramos Carneiro

Pavel Novoselov

Tulasi Sridhar Reddy Guntaka

Erno Hermanus Antonius Langendijk

Christian Etienne Hendriks

Abhishek Kumar

Henricus Petronella Maria Derckx

Toru Sakai

Sukhdip Sandhu

Suki Sandhu

Xiaoran Li

A display device includes a first substrate and a second substrate opposite to the first substrate. The display device includes a pixel region on the first substrate. The pixel region includes a plurality of input lines. Each input line is configured to apply an electric potential to a portion of a pixel in the pixel region. The display device includes a memory storing a drive scheme for the display device and a pixel control system. A solution to a cost function for the display device is calculated, such as by the pixel control system. The cost function expresses a performance attribute of the display device. The drive scheme is modified using the solution to the cost function to create a modified drive scheme, and a voltage is applied to one of the plurality of input lines according to the modified drive scheme to drive the display device.

Adaptive drive scheme for electrowetting displays

An electrowetting display device is presented. The electrowetting display device includes a first support plate and a plurality of pixel walls over the first support plate. The plurality of pixel walls are associated with an electrowetting pixel. The display device includes a storage capacitor beneath the electrowetting pixel. The storage capacitor includes a first plate, a second plate, and a dielectric material having a variable relative permittivity. The dielectric material is disposed between the first plate and the second plate. The display device includes a controller configured to control the relative permittivity of the dielectric material to set a capacitance value of the storage capacitor. In embodiments, the dielectric material includes at least one of a transition metal dichalcogenide and a thin-film Barium Strontium Titanate (BST).

Electrowetting pixel with adjustable capacitance

An electrowetting display device includes a first support plate and an opposing second support plate and an electrowetting pixel region between the first support plate and the second support plate. A thin film transistor (TFT) structure is over the first support plate and associated with the electrowetting pixel region. The TFT structure includes a first metal layer over the first support plate. The first metal layer includes a gate and a reflective metal portion. A semiconductor layer is over the gate. A dielectric layer is on the first metal layer. The dielectric layer includes a first contact hole extending along at least a portion of a length of the dielectric layer. A light sensing element is disposed over the dielectric layer and in ohmic contact with the reflective metal portion.

Apparatus and method for reducing power consumption during display driving

An electrowetting display device may comprise rows and columns of pixels. Each of the pixels may include a thin film transistor (TFT) that is switchable to select each of the pixels using active matrix addressing. The electrowetting display device may further comprise source lines connected to the TFT of each of the pixels; gate lines connected to the TFT of each of the pixels; and a supplemental capacitor disposed between each of the gate lines and a ground and having a capacitance approximately equal to an equivalent capacitance of a group of pixels that are interconnected with one another on one of the gate lines, wherein the group of pixels are a subset of the rows and columns of pixels.

Dynamic reset voltage for an electrowetting display device

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.

Reflectance in electrowetting displays

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.

Electrowetting display device including a reflective layer having a specular reflector and a diffuse reflector

An apparatus includes a current sensor configured to couple to a power source and to sense a present current draw on the power source by a powered device. A voltage converter is coupled to the current sensor. The voltage converter includes an output line configured to couple to the powered device to provide an output charge to the powered device. The voltage converter is configured to adjust the output charge in relation to the sensed present current draw on the power source.

Apparatus and method for dynamically providing charge

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.

Reset drive voltage to enhance grey scale resolution for an electrowetting display device

An electrowetting display device includes a first support plate and a second support plate. A first fluid and a second fluid that is immiscible with the first fluid are between the first support plate and the second support plate. A plurality of pixel walls having concave side surfaces are formed on the first support plate to define a plurality of electrowetting pixels. A pixel electrode is disposed on the first support plate for applying a voltage within each electrowetting pixel to cause relative displacement of the first fluid and the second fluid.

Electrowetting display pixels with pixel walls having non-planar side surfaces

A system for controlling access to secured resources using a security token having a hologram embossed thereon is provided. A key is split into a user key and a complimentary key based on a mask, wherein key values in the user key correspond to idle state values in the complimentary key and vice versa. The user key is used to generate a user key array, that is used to generate a three-dimensional virtual image that is holographically embossed onto a security token. The hologram is merged with a corresponding hologram for the complimentary key and the combination compared to an image of an ensemble of the key. The combination can be mergers of images or extractions of holograms. If a match is found, within a tolerance, an access grant signal is sent to the secure resources, thereby securing the resources based on presence of the security token.

Security system using keys encoded in holograms

Subject matter disclosed herein relates to arrangements and techniques that provide for harvesting thermal energy within a display, for example an electrowetting display, of an image display apparatus and converting the thermal energy into electricity. The electrowetting display comprises a first substrate and a second substrate opposite to the first substrate, a plurality of pixel portions defined between the first substrate and the second substrate, and a hydrophobic surface on the first substrate. A first fluid is included within the pixel portions and on the hydrophobic surface, while a second fluid is included on the first fluid, wherein the second fluid is substantially immiscible with the first fluid. A pyroelectric layer is included between the first substrate and the second substrate, wherein the pyroelectric layer is configured to absorb thermal energy within the electrowetting display and output a voltage based upon the thermal energy.

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Eindhoven, Netherlands

Steven Ramos Carneiro