Inventor · disambiguated record
Tapani Levola
Also filed as: LEVOLA TAPANI · LEVOLA TAPANI KALERVO
55 granted patents·12 pending applications·3,832 citations·filing 1994–2023
99Inventor score
Files withNOKIA CORP20LEVOLA TAPANI14MICROSOFT TECHNOLOGY LICENSING LLC10SHENZHEN OPTIARK SEMICONDUCTOR TECH LIMITED7SAARIKKO PASI2
Top patents by PatentIndex Score
67 records- 0199US9535253B2Display systemMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2015·Granted Jan 3, 2017·102 cites·20 claims
- 0299US9372347B1Display systemLEVOLA TAPANI·Filed 2015·Granted Jun 21, 2016·127 cites·20 claims
- 0399US8547638B2Color distribution in exit pupil expandersLEVOLA TAPANI·Filed 2012·Granted Oct 1, 2013·198 cites·21 claims
- 0499US8320032B2Diffractive beam expander and a virtual display based on a diffractive beam expanderLEVOLA TAPANI·Filed 2007·Granted Nov 27, 2012·185 cites·13 claims
- 0599US8160411B2Device for expanding an exit pupil in two dimensionsLEVOLA TAPANI·Filed 2006·Granted Apr 17, 2012·333 cites·15 claims
- 0699US7764413B2General diffractive optics method for expanding an exit pupilNOKIA CORP·Filed 2005·Granted Jul 27, 2010·187 cites·31 claims
- 0799US7206107B2Method and system for beam expansion in a display deviceNOKIA CORP·Filed 2004·Granted Apr 17, 2007·324 cites·28 claims
- 0898US9791696B2Waveguide gratings to improve intensity distributionsMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2015·Granted Oct 17, 2017·70 cites·17 claims
- 0998US9459451B2Eye tracking apparatus, method and systemMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2013·Granted Oct 4, 2016·115 cites·19 claims
- 1098US8830584B2Exit pupil expanders with spherical and aspheric substratesSAARIKKO PASI·Filed 2007·Granted Sep 9, 2014·142 cites·21 claims
- 1198US8466953B2Stereoscopic exit pupil expander displayLEVOLA TAPANI·Filed 2006·Granted Jun 18, 2013·120 cites·34 claims
- 1298US8314993B2Split exit pupil expanderLEVOLA TAPANI·Filed 2007·Granted Nov 20, 2012·115 cites·25 claims
- 1398US8254031B2Color distribution in exit pupil expandersLEVOLA TAPANI·Filed 2006·Granted Aug 28, 2012·123 cites·22 claims
- 1498US8194325B2Optical apparatus and methodLEVOLA TAPANI·Filed 2009·Granted Jun 5, 2012·90 cites·19 claims
- 1598US7184615B2Electrically tunable diffractive grating elementNOKIA CORP·Filed 2003·Granted Feb 27, 2007·183 cites·20 claims
- 1698US7181108B2Method and optical system for coupling light into a waveguideNOKIA CORP·Filed 2004·Granted Feb 20, 2007·153 cites·19 claims
- 1798US6805490B2Method and system for beam expansion in a display deviceNOKIA CORP·Filed 2002·Granted Oct 19, 2004·206 cites·13 claims
- 1897US10018844B2Wearable image display systemMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2015·Granted Jul 10, 2018·68 cites·18 claims
- 1997US7483604B2Diffractive grating element for balancing diffraction efficiencyNOKIA CORP·Filed 2003·Granted Jan 27, 2009·122 cites·12 claims
- 2096US10317677B2Display systemMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2015·Granted Jun 11, 2019·21 cites·21 claims
- 2196US8885997B2NED polarization system for wavelength pass-throughNGUYEN IAN A·Filed 2012·Granted Nov 11, 2014·185 cites·8 claims
- 2296US8494229B2Device and method for determining gaze directionJAERVENPAEAE TONI·Filed 2008·Granted Jul 23, 2013·145 cites·20 claims
- 2396US8314819B2Displays with integrated backlightingKIMMEL JYRKI·Filed 2007·Granted Nov 20, 2012·102 cites·22 claims
- 2495US10359627B2Waveguide coatings or substrates to improve intensity distributions having adjacent planar optical component separate from an input, output, or intermediate couplerMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2015·Granted Jul 23, 2019·24 cites·20 claims
- 2595US8155489B2Method for coupling light into a thin planar waveguideSAARIKKO PASI RISTO OLAVI·Filed 2006·Granted Apr 10, 2012·133 cites·20 claims
- 2694US9304235B2MicrofabricationMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2014·Granted Apr 5, 2016·23 cites·20 claims
- 2793US11480722B2Optical expander device and its display device and method for outputting light and displaying imageSHENZHEN OPTIARK SEMICONDUCTOR TECH LIMITED·Filed 2020·Granted Oct 25, 2022·6 cites·14 claims
- 2893US11119262B1Optical device, display device, and method for outputting light and displaying image thereofSHENZHEN OPTIARK SEMICONDUCTOR TECH LIMITED·Filed 2020·Granted Sep 14, 2021·6 cites·18 claims
- 2993US7997723B2Display apparatus and deviceNOKIA CORP·Filed 2008·Granted Aug 16, 2011·42 cites·22 claims
- 3091US9910276B2Diffractive optical elements with graded edgesMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2015·Granted Mar 6, 2018·11 cites·8 claims
- 3190US10345601B2Wearable image display systemMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2018·Granted Jul 9, 2019·6 cites·20 claims
- 3290US9766464B2Reducing ghost imagesPOON YARN CHEE·Filed 2015·Granted Sep 19, 2017·12 cites·20 claims
- 3386US9753297B2Optical apparatus and method for expanding an exit pupilSAARIKKO PASI·Filed 2010·Granted Sep 5, 2017·9 cites·28 claims
- 3486US8717392B2Apparatus for enabling users to view images, methods and computer readable storage mediumsLEVOLA TAPANI·Filed 2009·Granted May 6, 2014·14 cites·22 claims
- 3582US6758563B2Eye-gaze trackingNOKIA CORP·Filed 2000·Granted Jul 6, 2004·50 cites·23 claims
- 3681US8331006B2Display device and a method for illuminating a light modulator array of a display deviceLEVOLA TAPANI·Filed 2008·Granted Dec 11, 2012·10 cites·20 claims
- 3781US6445433B1Pixel structure having deformable material and method for forming a light valveNOKIA CORP·Filed 2000·Granted Sep 3, 2002·23 cites·13 claims
- 3877US7410309B2Optical shutterNOKIA CORP·Filed 2005·Granted Aug 12, 2008·5 cites·16 claims
- 3976US8092723B2Method of producing a diffraction grating elementLAAKKONEN PASI·Filed 2005·Granted Jan 10, 2012·3 cites·15 claims
- 4070US6773114B2Portable multimode display deviceNOKIA CORP·Filed 2001·Granted Aug 10, 2004·13 cites·20 claims
- 4168US9200779B2Three-dimensional display for displaying volumetric imagesLEVOLA TAPANI KALERVO·Filed 2010·Granted Dec 1, 2015·3 cites·20 claims
- 4262US10663734B2Image display systemMICROSOFT TECHNOLOGY LICENSING LLC·Filed 2019·Granted May 26, 2020·0 cites·20 claims
- 4360US7885506B2Device and a method for polarized illumination of a micro-displayNOKIA CORP·Filed 2008·Granted Feb 8, 2011·2 cites·13 claims
- 4458US7050126B2Direct view display based on light diffraction from a deformable layerNOKIA CORP·Filed 2003·Granted May 23, 2006·6 cites·15 claims
- 4556US8120762B2Light guide and optical sensing module input device and method for making sameLEVOLA TAPANI·Filed 2008·Granted Feb 21, 2012·2 cites·21 claims
- 4653US12399308B2Display apparatus comprising diffractive elementsSHENZHEN OPTIARK SEMICONDUCTOR TECH LIMITED·Filed 2022·Granted Aug 26, 2025·0 cites·12 claims
- 4752US12265219B2Head-up display having a large exit pupilSHENZHEN QIZE TECH PARTNERSHIP LIMITED PARTNERSHIP·Filed 2022·Granted Apr 1, 2025·0 cites·14 claims
- 4849US12366754B2Display device, a vehicle with a display device and display virtual image methodSHENZHEN OPTIAVE DISPLAY TECH CO LTD·Filed 2022·Granted Jul 22, 2025·0 cites·7 claims
- 4949US2023296883A1Optical expander apparatus of large field of view and display apparatusSHENZHEN OPTIARK SEMICONDUCTOR TECH LIMITED·Filed 2022·Application pending·0 cites
- 5048US6381061B2Pixel structure having deformable material and method for forming a light valveNOKIA CORP·Filed 1999·Granted Apr 30, 2002·12 cites·20 claims
Showing the top 50 of 67 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Tapani Levola files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →