Inventor · disambiguated record
Christopher A. Ludden
Also filed as: LUDDEN CHRISTOPHER · LUDDEN CHRISTOPHER A
48 granted patents·5 pending applications·937 citations·filing 1988–2020
98Inventor score
Files withSYNAPTICS INC21NAT SEMICONDUCTOR CORP10EASTMAN KODAK CO8CRYSTAL SEMICONDUCTOR3LUDDEN CHRISTOPHER A3
Top patents by PatentIndex Score
53 records- 0197US8970537B1Matrix sensor for image touch sensingSYNAPTICS INC·Filed 2014·Granted Mar 3, 2015·65 cites·31 claims
- 0296US7843422B1Apparatus and method for ambient light compensation for backlight control in small format displaysNAT SEMICONDUCTOR CORP·Filed 2005·Granted Nov 30, 2010·30 cites·20 claims
- 0393US9007343B1Display guarding techniquesSYNAPTICS INC·Filed 2013·Granted Apr 14, 2015·15 cites·30 claims
- 0493US6970152B1Stacked amplifier arrangement for graphics displaysNAT SEMICONDUCTOR CORP·Filed 2002·Granted Nov 29, 2005·61 cites·22 claims
- 0592US5574475ASignal driver circuit for liquid crystal displaysCRYSTAL SEMICONDUCTOR CORP·Filed 1993·Granted Nov 12, 1996·114 cites·25 claims
- 0690US9576557B2Distributed blanking for touch optimizationSYNAPTICS INC·Filed 2015·Granted Feb 21, 2017·6 cites·25 claims
- 0788US6861886B1Clock deskew protocol using a delay-locked loopNAT SEMICONDUCTOR CORP·Filed 2003·Granted Mar 1, 2005·61 cites·20 claims
- 0887US9857925B2Combining sensor electrodes in a matrix sensorSYNAPTICS INC·Filed 2014·Granted Jan 2, 2018·10 cites·19 claims
- 0986US9552089B2Capacitive sensing using a matrix electrode patternSYNAPTICS INC·Filed 2013·Granted Jan 24, 2017·8 cites·19 claims
- 1085US10088951B2Matrix sensor for image touch sensingSYNAPTICS INC·Filed 2015·Granted Oct 2, 2018·3 cites·19 claims
- 1185US4952911AScanning intrusion detection deviceEASTMAN KODAK CO·Filed 1988·Granted Aug 28, 1990·76 cites·22 claims
- 1284US9041685B2Distributed blanking for touch optimizationLILLIE JEFFREY·Filed 2012·Granted May 26, 2015·7 cites·21 claims
- 1384US5389998ACamera power supply systemEASTMAN KODAK CO·Filed 1993·Granted Feb 14, 1995·26 cites·14 claims
- 1483US5726676ASignal driver circuit for liquid crystal displaysCRYSTAL SEMICONDUCTOR·Filed 1995·Granted Mar 10, 1998·54 cites·21 claims
- 1582US6954201B1Data bus system and protocol for graphics displaysNAT SEMICONDUCTOR CORP·Filed 2002·Granted Oct 11, 2005·24 cites·19 claims
- 1682US5703617ASignal driver circuit for liquid crystal displaysCRYSTAL SEMICONDUCTOR·Filed 1994·Granted Dec 30, 1997·46 cites·21 claims
- 1781US9760212B2Matrix sensor for image touch sensingSYNAPTICS INC·Filed 2015·Granted Sep 12, 2017·2 cites·18 claims
- 1881US9298325B2Processing system for a capacitive sensing deviceSYNAPTICS INC·Filed 2013·Granted Mar 29, 2016·6 cites·25 claims
- 1981US9298299B2Multi-sensor touch integrated display driver configuration for capacitive sensing devicesSYNAPTICS INC·Filed 2014·Granted Mar 29, 2016·4 cites·21 claims
- 2080US4967183AMethod of intrusion detection over a wide areaEASTMAN KODAK CO·Filed 1988·Granted Oct 30, 1990·49 cites·12 claims
- 2179US7268790B1Display system with framestore and stochastic ditheringNAT SEMICONDUCTOR CORP·Filed 2002·Granted Sep 11, 2007·16 cites·24 claims
- 2278US8072394B2Video display driver with data enable learningLUDDEN CHRISTOPHER A·Filed 2008·Granted Dec 6, 2011·5 cites·8 claims
- 2378US4949074AMethod of intrusion detectionEASTMAN KODAK CO·Filed 1988·Granted Aug 14, 1990·51 cites·10 claims
- 2477US9298314B2Mitigation of display update noise using proximately disposed coupling electrodeSYNAPTICS INC·Filed 2014·Granted Mar 29, 2016·4 cites·22 claims
- 2577US7081901B1Display system with framestore and stochastic ditheringNAT SEMICONDUCTOR CORP·Filed 2003·Granted Jul 25, 2006·14 cites·25 claims
- 2677US5719591ASignal driver circuit for liquid crystal displaysCRYSTAL SEMICONDUCTOR·Filed 1995·Granted Feb 17, 1998·39 cites·27 claims
- 2775US9542023B2Capacitive sensing using matrix electrodes driven by routing traces disposed in a source line layerSYNAPTICS INC·Filed 2013·Granted Jan 10, 2017·3 cites·18 claims
- 2875US9304625B2Synchronizing a switched power supplySYNAPTICS INC·Filed 2013·Granted Apr 5, 2016·4 cites·22 claims
- 2973US10133419B2Flexible processing module for different integrated touch and display configurationsSYNAPTICS INC·Filed 2014·Granted Nov 20, 2018·3 cites·20 claims
- 3073US4903009AIntrusion detection deviceEASTMAN KODAK CO·Filed 1988·Granted Feb 20, 1990·35 cites·23 claims
- 3171US9778790B2Matrix sensor for image touch sensingSYNAPTICS INC·Filed 2015·Granted Oct 3, 2017·1 cites·21 claims
- 3271US8416173B2Display system with frame buffer and power saving sequenceLUDDEN CHRISTOPHER A·Filed 2006·Granted Apr 9, 2013·2 cites·9 claims
- 3370US10311825B2Display driverNAT SEMICONDUCTOR CORPORATION·Filed 2016·Granted Jun 4, 2019·1 cites·20 claims
- 3469US9264682B2Display driverLUDDEN CHRISTOPHER·Filed 2012·Granted Feb 16, 2016·2 cites·5 claims
- 3568US9465482B2Display guarding techniquesSYNAPTICS INC·Filed 2015·Granted Oct 11, 2016·1 cites·20 claims
- 3668US9280231B2Disabling display lines during input sensing periodsSYNAPTICS INC·Filed 2013·Granted Mar 8, 2016·2 cites·20 claims
- 3768US7102610B2Display system with frame buffer and power saving sequenceNAT SEMICONDUCTOR CORP·Filed 2003·Granted Sep 5, 2006·9 cites·13 claims
- 3866US9621135B1Voltage level shifterATMEL CORP·Filed 2016·Granted Apr 11, 2017·1 cites·21 claims
- 3965US5101335ADC-to-DC converter using coupled inductor current sensing and predetermined on timeEASTMAN KODAK CO·Filed 1990·Granted Mar 31, 1992·32 cites·18 claims
- 4062US5245398ATime-multiplexed multi-zone rangefinderEASTMAN KODAK CO·Filed 1991·Granted Sep 14, 1993·25 cites·3 claims
- 4161US4990930AHigh speed thermal printing apparatusEASTMAN KODAK CO·Filed 1990·Granted Feb 5, 1991·18 cites·12 claims
- 4260US10067626B2Multi-sensor touch integrated display driver configuration for capacitive sensing devicesSYNAPTICS INC·Filed 2017·Granted Sep 4, 2018·0 cites·20 claims
- 4357US10268313B2Display guarding techniquesSYNAPTICS INC·Filed 2016·Granted Apr 23, 2019·0 cites·22 claims
- 4457US9791990B2Multi-sensor touch integrated display driver configuration for capacitive sensing devicesSYNAPTICS INC·Filed 2016·Granted Oct 17, 2017·0 cites·20 claims
- 4557US2008303767A1Video display driver with gamma controlNAT SEMICONDUCTOR CORP·Filed 2008·Application pending·0 cites
- 4657US2015091842A1Matrix sensor for image touch sensingSYNAPTICS INC·Filed 2013·Application pending·0 cites
- 4751US2008303836A1Video display driver with partial memory controlNAT SEMICONDUCTOR CORP·Filed 2008·Application pending·0 cites
- 4850US9703411B2Reduction in latency between user input and visual feedbackLUDDEN CHRISTOPHER A·Filed 2010·Granted Jul 11, 2017·0 cites·27 claims
- 4949US9459367B2Capacitive sensor driving technique that enables hybrid sensing or equalizationSYNAPTICS INC·Filed 2014·Granted Oct 4, 2016·0 cites·21 claims
- 5048US11409852B2Device with biometric-gated displayIDEX BIOMETRICS ASA·Filed 2019·Granted Aug 9, 2022·0 cites·15 claims
Showing the top 50 of 53 patent records by PatentIndex Score.
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