# US 11,305,621 B2 · Vehicle display system with reflection control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,305,621 B2 - Document ID: US11305621B2 - Status: Granted - Kind: B2 - Application number: 16/693,923 - Filed: 2019-11-25 - Published: 2020-05-28 - Granted: 2022-04-19 - Earliest claimed: 2018-11-26 - Assignees: Gentex Corporation - Applicants: Gentex Corporation - Inventors: Ethan J. Lee; John A. VanderPloeg; Andrew D. Weller - Web page: https://patentgrep.com/patent/US11305621B2 ## CPC - B60J 3/06: using polarising effect - B60R 1/088: {using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors} - B60R 11/0235: {of flat type, e.g. LCD} - G02F 1/1313: {specially adapted for a particular application} - G02F 1/133528: {Polarisers} - G02F 1/133536: {Reflective polarizers (G02F1/13362 takes precedence)} - G02F 1/157: Structural association of cells with optical devices, e.g. reflectors or illuminating devices - G02F 1/163: Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor - B60J 7/043: Sunroofs (B60J7/047 - B60J7/053 take precedence){e.g. sliding above the roof} - B60R 2011/0026: {Windows, e.g. windscreen} - B60R 2011/0033: {Rear-view mirrors} - G02F 1/133531: {characterised by the arrangement of polariser or analyser axes} - G02F 1/1336: {Illuminating devices} - G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers - G02F 2203/02: reflective - B60J: WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES (fastening, suspending, closing, or opening of such devices E05) - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract A display system for a vehicle comprises a display device disposed inside a passenger compartment of the vehicle. The passenger compartment is configured to receive light from a first polarization filter disposed on a light-transmissive panel of the vehicle. The first polarization filter is oriented in a first orientation and the display device is configured to display video data from a display screen. The display device comprises an electro-optic element comprising a plurality of substrates and a second polarization filter disposed on at least one of the plurality of substrates. The second polarization filter is oriented in a second orientation parallel to the first orientation. ## Claims ### Claim 1 A display system for a vehicle comprising: a display device disposed inside a passenger compartment of the vehicle, wherein the passenger compartment is configured to receive light from a first polarization filter included as a film, layer, or coating of a window or a sunroof of the vehicle, the first polarization filter oriented in a first orientation and the display device is configured to display video data from a display screen, the display device comprising: an electro-optic element comprising a plurality of substrates; and a second polarization filter disposed on at least one of the plurality of substrates; and wherein the second polarization filter is oriented in a second orientation parallel to the first orientation. ### Claim 2 (depends on 1) The display system according to claim 1, wherein the second polarization layer comprises a thin film or coating. ### Claim 3 (depends on 1) The display system according to claim 1, wherein the plurality of substrates comprises a first substrate comprising a first surface and a second surface, and a second substrate comprising a third surface and a fourth surface, and wherein the electro-optic element comprises an electro-optic medium disposed between the first substrate and the second substrate. ### Claim 4 (depends on 3) The display system according to claim 3, wherein the second polarization filter is disposed on at least one of the first surface, the third surface, and the fourth surface of the plurality of substrates. ### Claim 5 (depends on 3) The display system according to claim 3, further comprising a transflective coating disposed on the third surface of the electro-optic element. ### Claim 6 (depends on 3) The display system according to claim 3, wherein the display device comprises a backlight and a liquid crystal element. ### Claim 7 (depends on 6) The display system according to claim 6, wherein the display device further comprises a third polarization filter oriented in a third orientation and disposed between the backlight and the liquid crystal element. ### Claim 8 (depends on 7) The display system according to claim 7, wherein the display device further comprises a fourth polarization filter oriented in a fourth orientation and disposed between the liquid crystal element and the electro-optic element. ### Claim 9 (depends on 8) The display system according to claim 8, wherein the third orientation of the third polarization filter is arranged perpendicular to the fourth orientation of the fourth polarization filter. ### Claim 10 (depends on 8) The display system according to claim 8, wherein the fourth orientation of the fourth polarization filter is arranged parallel to the second orientation of the second polarization filter. ### Claim 11 (depends on 1) The display system according to claim 1, wherein the first polarization filter and the second polarization filter comprise reflective polarizers. ### Claim 12 (depends on 1) The display system according to claim 1, wherein the first polarization filter and the second polarization filter comprise transmissive polarizers. ### Claim 13 A method for displaying visual information on a display disposed in a passenger compartment of a vehicle, the method comprising: receiving filtered light comprising a first polarization in the passenger compartment from a light-transmissive panel, wherein the light-transmissive panel is an exterior window of the vehicle that transmits the filtered light from environmental light proximate to the vehicle; receiving the filtered light of the first polarization at a display surface of a display device in the passenger compartment; transmitting the filtered light having the first polarization through a first polarization filter of an electrochromic element of the display; reflecting the filtered light from a mirror element of the display as reflected light; and inhibiting the transmission of the reflected light into the passenger compartment by blocking the reflected light with the first polarization filter. ### Claim 14 (depends on 13) The method according to claim 13, further comprising: generating display light having the first polarization depicting the visual information; and transmitting the display light through the electrochromic element and the second polarization filter for display in the passenger compartment. ### Claim 15 (depends on 13) The method according to claim 13, further comprising: receiving light on a light-transmissive panel of the vehicle; and transmitting the first polarization of the filtered light through a second polarization filter of the light-transmissive panel into the passenger compartment. ### Claim 16 A display system for a vehicle comprising: a light-transmissive panel of the vehicle comprising a first polarization filter oriented in a first orientation, wherein the light-transmissive panel comprises a window or sunroof of the vehicle; a display device disposed inside a passenger compartment of the vehicle and configured to display video data on a display screen, the display device comprising: an electro-optic element comprising: a first substrate comprising a first surface and a second surface; and a second substrate comprising a third surface and a fourth surface; and an electro-optic medium disposed between the first substrate and the second substrate; and a second polarization filter disposed on at least one of the first surface, the third surface, and the fourth surface; and wherein the second orientation is arranged parallel to the first orientation. ### Claim 17 (depends on 16) The display system according to claim 16, wherein the display device is configured to generate display light polarized at a third orientation, wherein the third orientation is parallel to the first orientation and the second orientation. ### Claim 18 (depends on 16) The display system according to claim 16, wherein the first polarization filter and the second polarization filter comprise reflective polarizers or transmissive polarizers.