Inventor
FUJIKAWA AKIO
JP14 patents
Patents
14 patentsUS5631582AMay 20, 1997
Frequency and phase comparator
ROHM CO LTD20 citations91
US7456767B2Nov 25, 2008
D/A converter circuit, organic EL drive circuit, and organic EL display
ROHM CO LTD11 citations84
US7042270B2May 9, 2006
Interface system between controller IC and driver IC, and IC suitable for such interface system
ROHM CO LTD8 citations72
US6337597B2Jan 8, 2002
Semiconductor integrated circuit device having a voltage regulator
ROHM CO LTD9 citations72
US6268763B1Jul 31, 2001
Semiconductor integrated circuit device for driving a magnetic disk apparatus
ROHM CO LTD8 citations72
US7477217B2Jan 13, 2009
D/A converter circuit, organic EL drive circuit and organic EL display device
ROHM CO LTD2 citations62
US7446737B2Nov 4, 2008
Organic EL panel driving circuit, organic EL display device and organic EL panel driving circuit inspecting device
ROHM CO LTD4 citations62
US7420529B2Sep 2, 2008
Organic EL panel drive circuit and organic EL display device
ROHM CO LTD5 citations62
US7321347B2Jan 22, 2008
Organic EL element drive circuit and organic EL display device using the same drive circuit
ROHM CO LTD2 citations62
US6963172B2Nov 8, 2005
Organic EL element drive circuit and organic EL display device using the same drive circuit
ROHM CO LTD4 citations62
US7426087B2Sep 16, 2008
Information recording apparatus
ROHM CO LTD0 citations43
US7019929B2Mar 28, 2006
Disk recording apparatus with erroneous writing protection
ROHM CO LTD0 citations43
US7084575B2Aug 1, 2006
Organic EL panel drive circuit and propriety test method for drive current of the same organic EL element drive circuit
ROHM CO LTD0 citations41
US7002303B2Feb 21, 2006
Organic EL panel drive circuit and organic EL display device using the same drive circuit
ROHM CO LTD0 citations41