Texas Instruments Corporation

Mitsuharu Iwasaki

Tatsuyuki Nihei

Xiaozhan Liu

Keiichi Kajino

A resistive touch screen controller provides two-finger gesture recognition. Current mirror circuitry, coupled to the XP/XN and YP/YN conductors, generates a screen current IL corresponding to X/y plate currents, and a corresponding mirror current IL/N. A variable resistor receives mirror current IL/N, and a resistance controller sets the resistance value Rof the variable resistor, and monitors a variable resistor voltage VRbased on IL/N*R. A processor determines calibration voltages for the X and Y plates corresponding to the mirror current IL/N for X/Y voltage values of VRfor a no touch condition, and X/Y offset voltages VOFS and HOFS of VRfor a two touch condition. For a two touch condition, the processor determines touch resistance relative to no touch, and generates an adjusted X/Y plate resistance &#x394;X/&#x394;Y based on VOFS/HOFS, and based on X/Y, determines a distance and angle between the two touches.

Apparatus to detect dual gesture on a resistive screen

Battery driven display device includes a battery, first and second comparators, non-volatile memory, controller driven by the voltage of the battery, and display device. Non-volatile memory stores the first and second reference voltages of the first and second comparators measured by using stabilized power supply. Controller detects when the first and second reference voltages of the first and second comparators become lower than the voltage of the battery when battery is connected, and determines the time at which end-point voltage of the battery will be reached based on the first and second detection times at the time of measurement and the measured reference voltages.

Battery end-point voltage detection method and battery end-point voltage detection system

A particulate detector system is provided that can sense particulates (such as smoke in the air). The system employs a reflected light system that generally avoids making measurements of light intensity. Instead, coded signals are compared with one another to determine error rates between emitted light and detected light (across a chamber). Based on the error rate, processing circuitry can determine particulate concentration.

Growing community of inventors

Yokohama, Japan

Mitsuharu Iwasaki