Visteon Global Technolgoies, Inc.

Anderson, David, Ryan

Mccarthy, Daniel, Joseph

Mccarthy, Elizabeth, Caitlin

Munro, Alexander

Phillips, Ramie

David Ryan Anderson

Paul Fredrick Luther Weindorf

Paul F L Weindorf

Gregory John Milne

Alexander Munro

Daniel Joseph McCarthy

Ramie Phillips

Elizabeth Caitlin Mccarthy

A circuit assembly detects a touch point within a display area. A plurality of light emitters are disposed around a periphery of the display area. A plurality of detectors are disposed around the periphery, each detector being opposed to a respective light emitter. Switching circuitry for connecting the light emitters and detectors in a switching matrix has a plurality of matrix rows and matrix columns. The switching circuitry includes a plurality of row lines, each row line corresponding to a respective matrix row and a plurality of column lines, each column line corresponding to a respective matrix column. Low-side switching transistors selectably couple the light emitters and detectors to the row and column lines, respectively. A common modulated signal is coupled to the anodes of all the light emitters. A detection signal is provided by connecting the collector terminals for the detector phototransistors in common. Consequently, high-side multiplexing circuits are avoided.

Cross-point matrix for infrared touchscreen

A flexible circuit board mounted with top-light LEDs and LED control circuits provides a convenient and space efficient way to backlight an LCD. The flexible circuit board may have multiple tabs that are folded such that the top-light LEDs provide light into a light pipe from multiple directions. The top-light LEDs and LED control circuits may be located on the same side of the flexible circuit board for improved cost savings and manufacturability.

Flexible led backlighting circuit

Growing community of inventors

West Lafayette, IN, United States of America

David Ryan Anderson