Qualcomm Mems Technologies, Inc.

Snaptrack Incorporated

Pramod Kumar Varma

Wilhelmus Johannes Robertus Van Lier

Alan G Lewis

Koorosh Aflatooni

Mark Todorovich

Sameer M Venugopal

Nao Sugawara Chuei

Paul Penchin Pan

James Steven Edgar

Eric Uriostigue

Ramesh K Goel

Robert Steven Kawamoto

This disclosure provides systems, methods and apparatus for controlling the states of a light modulator used in displays. A display apparatus includes pixel circuits coupled to the light modulators. Each pixel circuit can include an output node, a data capacitor, a charge transistor for charging the output node and a discharge transistor for selectively conducting a current between the output node and an update interconnect providing an update voltage. The display apparatus can include a controller for testing the pixel circuits to determine two or more update voltage levels, each update voltage level causing the discharge transistor to conduct current. The controller also can be configured to determine a logical high voltage level to be stored in the data capacitor based on the plurality of update voltage levels.

Display apparatus including self-tuning circuits for controlling light modulators

This disclosure provides systems, methods and apparatus for measuring capacitance of a display unit, such as an interferometric modulator (IMOD). In one example, a circuit may include an operational amplifier (op-amp), a voltage controlled current source, and feedback from an output of the op-amp as an input to the voltage controlled current source. An output of the voltage controlled current source may be provided to a display unit as well as an input of the op-amp. A second input of the op-amp may be provided a ramping reference voltage.

Closed loop dynamic capacitance measurement

A system for driving an array of display elements includes a supply line, at least one capacitor, a plurality of drive lines and overdrive lines, a plurality of switches and a controller configured to activate and deactivate subsets of the switches in order to selectively couple the at least one capacitor to the drive lines and to the overdrive lines. A method for generating an overdrive voltage includes activating and deactivating a plurality of switches to couple a drive voltage line and/or an overdrive voltage line to at least one capacitor.

Charge pump for producing display driver output

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for calibrating display arrays. In one aspect, a method of calibrating a display array includes determining a particular drive response characteristic and updating a particular drive scheme voltage between updates of image data on the display array.

System and method of updating drive scheme voltages

Growing community of inventors

La Jolla, CA, United States of America

Pramod Kumar Varma