| US 7,466,161 B2 | ||
| Direct detect sensor for flat panel displays | ||
| David W. Gardner, Colorado Springs, Colo. (US); and Andrew M. Hawryluk, Los Altos, Calif. (US) | ||
| Assigned to Photon Dynamics, Inc., San Jose, Calif. (US) | ||
| Filed on Apr. 20, 2006, as Appl. No. 11/379,413. | ||
| Claims priority of provisional application 60/673967, filed on Apr. 22, 2005. | ||
| Claims priority of provisional application 60/687621, filed on Jun. 02, 2005. | ||
| Claims priority of provisional application 60/689601, filed on Jun. 09, 2005. | ||
| Claims priority of provisional application 60/697844, filed on Jul. 08, 2005. | ||
| Prior Publication US 2006/0237627 A1, Oct. 26, 2006 | ||
| Int. Cl. G01R 31/00 (2006.01) | ||
| U.S. Cl. 324—770 | 6 Claims |
| 1. An apparatus operative to test an array of pixels formed on a panel, the apparatus comprising:
a first linear array of N sensors each sensor comprising:
a sensing electrode adapted to be capacitively coupled to a pixel electrode disposed on the panel; and
an associated feedback network configured to maintain the voltage of the sensing electrode at a substantially constant voltage
when the sensing electrode is positioned in proximity of the pixel electrode to be capacitively coupled thereto, said first
linear array of sensors adapted to be scanned over the panel at a continuous rate, wherein said feedback network comprises
an operational amplifier comprising a first input terminal coupled to the sensing electrode and a second input terminal coupled
to receive a first voltage supply, wherein an output signal of the operational amplifier is used to generate a feedback signal
adapted to drive the first input terminal of the operational amplifier; and
a second linear array of N sensors spaced at a distance D1 away from said first linear array of N sensors, said second linear array of N sensors configured to be scanned over a row
of the panel pixels at a known time period after the first linear array of sensors are scanned over the row of the panel pixels,
wherein said second linear array of sensors are adapted to capacitively measure voltages present on the panel pixels.
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