PANEL MISMATCH COMPENSATION FOR TOUCH ENABLED DISPLAYS

摘要

A controller with mismatch compensation for a touch panel is disclosed. A multi-stimulus controller for a touch panel can be formed on a single integrated circuit (single-chip) that can include a transmit section that can generate a plurality of drive signals, a plurality of transmit channels that can transmit the drive signals simultaneously to drive the touch panel, a receive channel that can receive a sense signal resulting from the driving of the touch panel, and a demodulation section that can demodulate the received sense signal to obtain sensing results, the demodulation section including a demodulator and a vector operator. The transmit section can include a pair of adjustable gain buffers that can adjust the gain of stimulation signals to account for the signal path length mismatch of various transmit signal paths.

主权项

1. A controller for a touch sensor panel, the controller comprising:
a transmit section that generates a plurality of drive signals; a plurality of transmit channels that transmit the drive signals simultaneously to drive the touch sensor panel; and a plurality of adjustable gain buffers coupled to the transmit section, wherein the adjustable gain buffers are configurable to compensate the plurality of drive signals from the transmit section for differences in path lengths in the touch sensor panel.