Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1998-04-13
2000-01-04
Epps, Georgia
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359265, 359274, 20419226, G02F 1153, G02F 115, C23C 1408, C23C 1434
Patent
active
060116420
ABSTRACT:
The electrochromic element (20) comprises a substrate (28) and an electrochromic layer (25) having a thickness d on the basis of a metal oxide selected from the group formed by tungsten oxide, molybdenum oxide, niobium oxide, manganese oxide and zirconium oxide, or combinations thereof. The electrochromic layer (25) is characterized in that the oxygen content in the layer (25) varies across the thickness d of the layer (25). Preferably, the variation of the oxygen content in the layer (25) comprises at least two local maxima and a local minimum. Preferably, the electrochromic layer (25) is composed of a plurality of sub-layers (25', 25", 25'"), with the variation of the oxygen content in the layer (25) occurring predominantly at the location of transitions between two sub-layers. Preferably, the electrochromic layer (25) comprises the metal oxide tungsten oxide WO.sub.x. The electrochromic element may be provided on the display screen of a display device. A description is given of a method of manufacturing the electrochromic layer (25).
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Boonekamp Erik P.
Verbeek Roy G. F. A.
Vink Teunis J.
Burke Margaret
Epps Georgia
Spain Norman N.
U.S. Philips Corporation
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