Van Thanh Tran

61008583, Aug 8, 2000

Sep 30, 1997

8/940703

Van N. Tran - Fremont CA

Infineon Technologies North America Corp. - San Jose CA

G09G 306

345 59

An alphanumeric symbol generator having a five-by-five matrix of twenty-one pixels. The pixels are arranged such that there are no pixels at the points where the second and fourth columns intersect with the second and fourth rows. The pixels may be light emitting devices, such as light emitting diodes or liquid crystal displays. The pixels may also consist of the pins in a dot-matrix printer. The pixels in the five-by-five matrix are activated in response to electronic codes corresponding to alphanumeric characters. Typically, a series of 21-pixel matrices are aligned side-by-side to create a display that communicates multiple words, numbers, and symbols.

20190384398, Dec 19, 2019

Jun 15, 2018

16/010258

- San Jose CA, US
Van H. Tran - San Jose CA, US
Kaniyalal Shah - Fremont CA, US
Danny A. Grant - Laval, CA
Juan Manuel Cruz-Hernandez - Montreal, CA

G06F 3/01
G06F 3/042

Systems and methods for differential optical position sensing for a haptic actuator are disclosed. In one embodiment, a system includes: an actuator configured to receive a drive signal and move an object to output a haptic effect; a first sensor configured to monitor a position of the object and output a first position signal; a second sensor configured to monitor the position of the object and output a second position signal different from the first position signal; a circuit configured to receive the first position signal and the second position signal and output a difference signal; and a processor configured to receive the difference signal and output a control signal to the actuator based on the difference signal.

20160103492, Apr 14, 2016

Dec 21, 2015

14/976251

- San Jose CA, US
Kaniyalal SHAH - Fremont CA, US
Van Hilton TRAN - Milpitas CA, US

G06F 3/01
H02P 3/12
G06F 3/041

A haptically-enabled system includes an actuator that has a first terminal and a second terminal. The second terminal is coupled to a voltage source, and a first switch is coupled to the first terminal and to ground. A second switch is coupled to the actuator. The second switch is parallel to the actuator.

20150002278, Jan 1, 2015

Sep 13, 2013

14/026200

- San Jose CA, US
Van Hilton TRAN - Milpitas CA, US
Douglas George BILLINGTON - Campbell CA, US

Immersion Corporation - San Jose CA

G08B 6/00

3404071

A haptic drive circuit includes a voltage input for receiving input power, a gate that compares a desired current level to an actual current level through the actuator, a switch coupled to the gate that interrupts or provides power from the voltage input to the actuator, and a current probe that detects the actual current level through the actuator with an output signal corresponding to the actual current level coupled to the gate. The gate compares the actual current level to the desired current level and causes the switch to interrupt input power when the actual current level is greater than the desired current level or to provide input power when the actual current level is less than or equal to the desired current level. The actual current through the circuit is a haptic signal causing a haptic actuator to generate a haptic effect.

20140117887, May 1, 2014

Mar 5, 2013

13/785699

- San Jose CA, US
Kaniyalal SHAH - Fremont CA, US
Van Hilton TRAN - Milpitas CA, US

IMMERSION CORPORATION - San Jose CA

H02P 7/00

318114

A haptically-enabled system includes an actuator that has a first terminal and a second terminal. The second terminal is coupled to a voltage source, and a first switch is coupled to the first terminal and to ground. A second switch is coupled to the actuator. The second switch is parallel to the actuator.