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US 5,671,059 AGranted
Electroluminescent color device
AssigneeHewlett-Packard Company
InventorKent D. Vincent
Life of this patent
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Abstract
Multiple electroluminescent (EL) emitters are constructed from layers deposited on a substrate and incorporated with a broadband sensor to form a colorimeter. The EL emitters produce light covering spectral segments determined by a filter layer and an active layer wherein the spectral segments sufficiently cover the visible spectrum to enable a wide range of colors to be accurately measured. The colorimeter is mounted in a desktop color printer to measure the color content of printed images and to calibrate the printer.
Claims10
A colorimeter for measuring color content of a color sample, comprising:
- a series of electroluminescent emitters, illuminating the color sample, each emitter responsive to an applied electrical signal and emitting light spanning a spectral segment wherein the visible light spectrum is substantially covered by the combination of spectral segments, the series including;
- a substrate,
- a first electrode layer on the substrate,
- a second electrode layer,
- an active layer between the first electrode layer and the second electrode layer, producing a light signal in response to the electrical signal applied across the first electrode layer and the second electrode layer,
- a first dielectric layer adjacent to the active layer,
- means for tailoring the light signal into spectral segments;
- and
- a broadband sensor, receiving light reflected by the color sample and producing a corresponding output signal.
6 more elements
Dependencies are inferred from the claim text.