Dual-function active matrix sensor array
First Claim
1. A dual-function active matrix sensor array comprising:
- a substrate with a top surface;
a plurality of sensing elements (sensels) formed in an array overlying the substrate top surface, each sensel comprising;
a thin-film transistor (TFT) having a channel resistance or source-to-drain resistance (RDS) responsive to a first environmental condition;
a passive element having an AC impedance responsive to a second environmental condition, different than the first environment condition; and
,a measurement device selectively connectable to each sensel in the array to simultaneously determine first environmental condition measurements and second environmental condition measurements, wherein;
the measurement device supplies an AC signal having a predetermined first amplitude and predetermined first phase, and makes a first environmental condition determination and a second environmental condition determination in response to detecting a change in the AC signal amplitude with respect to the AC signal first amplitude, and a change in AC signal phase with respect to the AC signal first phase.
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Accused Products
Abstract
A method is provided for making multiple environmental measurements using a single sensing element. Each sensing element (sensel) includes a thin-film transistor (TFT) and a passive element. Typically, a plurality of sensels is provided arranged into an array. In response to an electrical stimulus, an electrical measurement is supplied that is responsive to a change in TFT electrical characteristic correlated to a first environmental condition, as well as a change in a characteristic of the passive element correlated to a second environmental condition. When the sensels are formed in an array, a plurality of electrical measurements is supplied corresponding plurality of locations on a monitored surface. Some exemplary environmental conditions include temperature, pressure, moisture, chemicals, oxygen, solution pH, salinity, and shear. The method determines the first environmental condition independent of the second environmental condition, while determining the second environmental condition independent of the first environmental condition.
23 Citations
23 Claims
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1. A dual-function active matrix sensor array comprising:
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a substrate with a top surface; a plurality of sensing elements (sensels) formed in an array overlying the substrate top surface, each sensel comprising; a thin-film transistor (TFT) having a channel resistance or source-to-drain resistance (RDS) responsive to a first environmental condition; a passive element having an AC impedance responsive to a second environmental condition, different than the first environment condition; and
,a measurement device selectively connectable to each sensel in the array to simultaneously determine first environmental condition measurements and second environmental condition measurements, wherein; the measurement device supplies an AC signal having a predetermined first amplitude and predetermined first phase, and makes a first environmental condition determination and a second environmental condition determination in response to detecting a change in the AC signal amplitude with respect to the AC signal first amplitude, and a change in AC signal phase with respect to the AC signal first phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for making multiple environmental measurements using a single sensing element, the method comprising:
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providing a sensing element (sensel) including a thin-film transistor (TFT) and a passive element, the sensel TFT having a gate electrode, a drain electrode, and a source electrode; accepting a first electrical stimulus, wherein accepting the first electrical stimulus includes; accepting a DC voltage at the gate electrode of the sensel TFT; and
,simultaneously accepting an AC signal at the drain electrode or source electrode of the sensel TFT; in response to the first electrical stimulus, supplying a first electrical measurement responsive to; a change in TFT electrical characteristic correlated to a first environmental condition; and
,a change in a characteristic of the passive element correlated to a second environmental condition. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification