# US 12,761,508 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,761,508 B2 - Document ID: US12761508B2 - Status: Granted - Kind: B2 - Application number: 18/912,623 - Filed: 2024-10-11 - Published: 2025-05-15 - Granted: 2026-10-13 - Earliest claimed: 2023-11-09 - Assignees: Innolux Corporation - Applicants: Innolux Corporation - Inventors: Yu-Tong Kuo; Jyun-Sian Li; Hong-Sheng Hsieh - Web page: https://patentgrep.com/patent/US12761508B2 ## CPC - G02F 1/1323: {Arrangements for providing a switchable viewing angle} - G02F 1/133531: {characterised by the arrangement of polariser or analyser axes} - G02F 1/134309: {characterised by their geometrical arrangement} - G02F 1/13439: {characterised by their electrical, optical, physical properties; materials therefor; method of making} - G02F 1/133611: {including means for improving the brightness uniformity} - 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 device, including a backlight, a display panel, a viewing angle control panel, and first to third polarizing units, is provided. The display panel is configured to convert an illumination light from the backlight into a display light. The viewing angle control panel is configured to control a light emission angle of the display device. The first polarizing unit is disposed between the backlight and the display panel and has a first absorption axis. The second polarizing unit is disposed between the display panel and the viewing angle control panel and has a second absorption axis. The third polarizing unit is disposed on the viewing angle control panel and has a third absorption axis. The third absorption axis is perpendicular to the first absorption axis and the second absorption axis, and the first absorption axis and the second absorption axis are perpendicular to each other on a same plane. ## Claims ### Claim 1 A display device, comprising: a backlight, configured to provide an illumination light; a display panel, disposed on a transmission path of the illumination light to convert the illumination light into a display light; a viewing angle control panel, configured to control a light emission angle of the display device; a first polarizing unit, disposed between the backlight and the display panel and having a first absorption axis; a second polarizing unit, disposed between the display panel and the viewing angle control panel and having a second absorption axis; and a third polarizing unit, disposed on the viewing angle control panel and having a third absorption axis, wherein the third absorption axis is perpendicular to the first absorption axis and the second absorption axis, and the first absorption axis and the second absorption axis are perpendicular to each other on a same plane; wherein the first absorption axis and the second absorption axis are not parallel to each other, the first absorption axis and the third absorption axis are not parallel to each other, and the second absorption axis and the third absorption axis are not parallel to each other. ### Claim 2 (depends on 1) The display device according to claim 1, further comprising: a circular polarizer, disposed on the third polarizing unit. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the third polarizing unit comprises a polarizer or a dye liquid crystal panel. ### Claim 4 (depends on 3) The display device according to claim 3, wherein the viewing angle control panel or the dye liquid crystal panel comprises: a first light transmitting electrode, disposed in a first region; a second light transmitting electrode, disposed in a second region, wherein the first light transmitting electrode and the second light transmitting electrode belong to a same layer and are separated from each other; and a third light transmitting electrode, disposed in the first region and the second region and located on one side of the first light transmitting electrode and the second light transmitting electrode. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the viewing angle control panel comprises: a first light transmitting electrode, disposed in a first region and a second region; a second light transmitting electrode, disposed in the first region and above the first light transmitting electrode; and a third light transmitting electrode, disposed in the first region and the second region and above the second light transmitting electrode. ### Claim 6 A display device, comprising: a backlight, configured to provide an illumination light; a display panel, disposed on a transmission path of the illumination light to convert the illumination light into a display light; a viewing angle control panel, configured to control a light emission angle of the display device; a first polarizing unit, disposed between the backlight and the display panel and having a first absorption axis; a second polarizing unit, disposed between the display panel and the viewing angle control panel and having a second absorption axis; and a third polarizing unit, disposed on the display panel and having a third absorption axis, wherein the third absorption axis and the second absorption axis are perpendicular to each other on a same plane, and the first absorption axis is perpendicular to the second absorption axis and the third absorption axis; wherein the first absorption axis and the second absorption axis are not parallel to each other, the first absorption axis and the third absorption axis are not parallel to each other, and the second absorption axis and the third absorption axis are not parallel to each other. ### Claim 7 (depends on 6) The display device according to claim 6, wherein the first polarizing unit, the viewing angle control panel, the second polarizing unit, the display panel, and the third polarizing unit are sequentially disposed on the backlight. ### Claim 8 (depends on 7) The display device according to claim 7, further comprising: a circular polarizer, disposed on the third polarizing unit. ### Claim 9 (depends on 7) The display device according to claim 7, wherein the third polarizing unit comprises a polarizer or a dye liquid crystal panel. ### Claim 10 (depends on 7) The display device according to claim 7, further comprising: another viewing angle control panel, disposed between the viewing angle control panel and the second polarizing unit. ### Claim 11 (depends on 10) The display device according to claim 10, wherein the viewing angle control panel comprises a first liquid crystal, the another viewing angle control panel comprises a second liquid crystal, and the second liquid crystal is different from the first liquid crystal. ### Claim 12 (depends on 11) The display device according to claim 11, wherein a light emission angle range controlled by the first liquid crystal is different from a light emission angle range controlled by the second liquid crystal. ### Claim 13 (depends on 9) The display device according to claim 9, wherein the viewing angle control panel or the dye liquid crystal panel comprises: a first light transmitting electrode, disposed in a first region; a second light transmitting electrode, disposed in a second region, wherein the first light transmitting electrode and the second light transmitting electrode belong to a same layer and are separated from each other; and a third light transmitting electrode, disposed in the first region and the second region and located on one side of the first light transmitting electrode and the second light transmitting electrode. ### Claim 14 (depends on 6) The display device according to claim 6, wherein the viewing angle control panel comprises: a first light transmitting electrode, disposed in a first region and a second region; a second light transmitting electrode, disposed in the first region and above the first light transmitting electrode; and a third light transmitting electrode, disposed in the first region and the second region and above the second light transmitting electrode.