Non-contact electrical probe utilizing charged fluid droplets
OwnerMichael Nystrom, Daniel Roitmaninventors
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Abstract
There present invention is directed to a system and method which a liquid dispensing head is positioned above the contact area of the device under test (DUT). Liquid droplets are dispensed form the head and these droplets are charged with an electrical charge so that when the drops form a pool of liquid on the contact area the pool is charged thereby causing current to flow in the DUT. In this manner, for example, the transistor at each pixel of an OLED can be tested. In one embodiment an inkjet head is used to dispense fluid that is subsequently charged. In still another embodiment, the inkjet head is piezoelectric.
Claims20
A probe comprising:
- a dispensing head adapted for being disposed apart from an electrical contact area, said dispensing head holding material capable of receiving an electrical charge;
- and
- a control device for imparting a charge to material dispensed from said dispersing head, said charged material operative for imparting a temporary charge to said electrical contract area.
The probe of claim 3 further comprising:
- a source of energy to selectively control said charging of said material.
A method of testing an organic light emitting diode (OLED), said method comprising:
- causing a liquid pool to be formed on a contact area of said OLED, said liquid pool creating an electrical charge on said contact area;
- and
- measuring current passing through at least one active element of said OLED as a result of said formed liquid pool.
A test device comprising:
- means for providing test signals;
- means for positioning a device under test (DUT);
- and
- means spaced apart from said positioning means for selectively controlling the flow of material therefrom, said selectively controlling means having at least one aperture in line with at least one contact area of a positioned DUT so as to establish an electrical charge on said contact area of said positioned DUT.
Dependencies are inferred from the claim text.