Active solid-state devices (e.g. – transistors – solid-state diode – Responsive to non-electrical signal – Electromagnetic or particle radiation
Reexamination Certificate
2007-02-13
2007-02-13
Flynn, Nathan J. (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Responsive to non-electrical signal
Electromagnetic or particle radiation
C257S414000, C257S428000, C257S431000, C257SE27134
Reexamination Certificate
active
10813864
ABSTRACT:
A pixel for detecting red and green light is a single pixel is described. The pixel comprises a deep N well formed in a P type epitaxial substrate. The pixel comprises a deep N well formed in a P type epitaxial substrate. A number of P wells, which are used as the sensor nodes, are formed in the deep N well. The use of these P wells as the sensor nodes improves the modulation transfer function. The depth of the deep N well is about equal to the depth of hole electron pairs generated by red light in silicon. The depth of the P wells is about equal to the depth of hole electron pairs generated by green light in silicon. A red/green signal is determined at each P well by determining the potentials between each of the P wells and the deep N well after a charge integration cycle with the P wells and the deep N well isolated. A green signal is determined at each P well by determining the potentials between each of the P wells and the deep N well after a charge integration cycle with the P wells isolated and the deep N well held at a fixed positive voltage. A red signal at each P well is determined by subtracting the green signal at that P well from the red/green signal at that P well. The invention can take advantage of the fact that the human perception of a green signal is green, the human perception of a red signal is red, and the human perception of a red/green signal is red. The invention also works if P regions are substituted for N regions and N regions substituted for P regions.
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Brill Michael Henry
Dosluoglu Taner
Ackerman Stephen B.
Dialog Imaging Systems GmbH
Flynn Nathan J.
Prescott Larry J.
Quinto Kevin
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