公开(公告)号：US20240369869A1

公开(公告)日：2024-11-07

申请号：US18643255

申请日：2024-04-23

Applicant: RealD Spark, LLC

Inventor： Jonathan Harrold ,  Michael G Robinson ,  Graham J. Woodgate ,  Robert Ramsey ,  Ben Ihas

IPC: G02F1/13 ,  G02F1/133 ,  G02F1/1335 ,  G02F1/1343

Abstract: A switchable privacy display device comprises a spatial light modulator and a switchable diffractive view angle control retarder arrangement arranged between a display polariser of the spatial light modulator and an additional polariser. The display achieves high image visibility to an off-axis user in a share mode of operation and high image security to an off-axis snooper in privacy mode of operation.

公开(公告)号：US12066717B2

公开(公告)日：2024-08-20

申请号：US17886233

申请日：2022-08-11

Applicant: RealD Spark, LLC

Inventor： Michael G. Robinson ,  Graham J. Woodgate ,  Robert A. Ramsey ,  Jonathan Harrold

IPC: G02F1/1335 ,  F21V8/00 ,  G02B5/30 ,  G02F1/13 ,  G02F1/13363 ,  G02F1/1337 ,  G02F1/1347 ,  G02F1/137

CPC classification number: G02F1/13363 ,  G02B5/3016 ,  G02B5/3083 ,  G02B6/0035 ,  G02B6/0055 ,  G02F1/1323 ,  G02F1/133528 ,  G02F1/133536 ,  G02F1/133634 ,  G02F1/1337 ,  G02F1/13471 ,  G02F1/137 ,  G02F1/133738 ,  G02F1/133742 ,  G02F1/13706 ,  G02F1/13712 ,  G02F2203/12 ,  G02F2413/02

Abstract: A privacy display comprises a spatial light modulator and a compensated switchable liquid crystal retarder arranged between first and second polarisers arranged in series with the spatial light modulator. In a privacy mode of operation, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction over a wide polar field. In a wide angle mode of operation, the switchable liquid crystal retardance is adjusted so that off-axis luminance is substantially unmodified.

公开(公告)号：US12013603B2

公开(公告)日：2024-06-18

申请号：US18216788

申请日：2023-06-30

Applicant: RealD Spark, LLC

Inventor： Michael G. Robinson ,  Graham J. Woodgate ,  Jonathan Harrold

IPC: G02F1/13 ,  B60K35/00 ,  F21V8/00 ,  G02F1/1335 ,  G02F1/139 ,  B60K35/22

CPC classification number: G02F1/1323 ,  B60K35/00 ,  G02B6/0053 ,  G02B6/0055 ,  G02B6/0068 ,  G02F1/133528 ,  G02F1/1393 ,  B60K35/22 ,  B60K2360/23 ,  B60K2360/336

Abstract: A switchable backlight for a switchable privacy display apparatus comprises a collimated waveguide, first and second light sources and an optical turning film comprising elongate prismatic elements with facet orientations that pupillate the output of the waveguide in two orthogonal directions for each of first and second light sources. High luminance uniformity is achieved for a head-on user in privacy and public viewing modes and high uniformity of security factor is achieved for off-axis snoopers, with increased speed of privacy switch-on in privacy mode.

公开(公告)号：US11977286B2

公开(公告)日：2024-05-07

申请号：US18104900

申请日：2023-02-02

Applicant: RealD Spark, LLC

Inventor： Graham J. Woodgate ,  Michael G. Robinson ,  Jonathan Harrold ,  Robert A Ramsey

IPC: G02F1/1333 ,  G02B5/30 ,  G02F1/13 ,  G02F1/133 ,  G02F1/1335 ,  G02F1/13363 ,  G02F1/1337 ,  G02F1/1343 ,  H04N13/383

CPC classification number: G02F1/1323 ,  G02B5/3083 ,  G02F1/13306 ,  G02F1/13336 ,  G02F1/133536 ,  G02F1/133607 ,  G02F1/133636 ,  G02F1/133738 ,  G02F1/133796 ,  G02F1/134318 ,  H04N13/383

Abstract: A display device comprising a spatial light modulator having a display polariser arranged on one side is provided with an additional polariser arranged on the same side as the display polariser and a polar control retarder between the additional polariser and the display polariser. The polar control retarder includes a liquid crystal retarder having two surface alignment layers disposed adjacent to a layer of liquid crystal material on opposite sides. The surface alignment layers provide alignment in the adjacent liquid crystal material with a twist. The out-of-plane orientation of the twisted layer of liquid crystal material is modified across at least one region of the display device to provide a transmission function in response to the measured location of an off-axis snooper, achieving increased size of polar region for which desired uniformity of security factor, or reduced distraction across the display to the driver in an automotive application is achieved.

公开(公告)号：US20230125159A1

公开(公告)日：2023-04-27

申请号：US17886233

申请日：2022-08-11

Applicant: RealD Spark, LLC

Inventor： Michael G. Robinson ,  Graham J. Woodgate ,  Robert A. Ramsey ,  Jonathan Harrold

IPC: G02F1/13363 ,  G02B5/30 ,  G02F1/1335 ,  G02F1/137 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/1347 ,  F21V8/00

Abstract: A privacy display comprises a spatial light modulator and a compensated switchable liquid crystal retarder arranged between first and second polarisers arranged in series with the spatial light modulator. In a privacy mode of operation, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction over a wide polar field. In a wide angle mode of operation, the switchable liquid crystal retardance is adjusted so that off-axis luminance is substantially unmodified.

公开(公告)号：US11630336B2

公开(公告)日：2023-04-18

申请号：US17194381

申请日：2021-03-08

Applicant: RealD Spark, LLC

Inventor： Michael G. Robinson ,  Graham J. Woodgate ,  Jonathan Harrold ,  Robert A. Ramsey

IPC: G02F1/13 ,  G02F1/1335 ,  G02F1/1337 ,  G02F1/13363

Abstract: A privacy display comprises a polarised output spatial light modulator, reflective polariser, plural polar control retarders and a polariser. In a privacy mode of operation, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. Further, display reflectivity is reduced for on-axis reflections of ambient light, while reflectivity is increased for off-axis light. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction and increased frontal reflectivity to ambient light. In a public mode of operation, the liquid crystal retardance is adjusted so that off-axis luminance and reflectivity are unmodified.

公开(公告)号：US11624944B2

公开(公告)日：2023-04-11

申请号：US17387056

申请日：2021-07-28

Applicant: RealD Spark, LLC

Inventor： Michael G Robinson ,  Graham J Woodgate ,  Jonathan Harrold

IPC: G02F1/13 ,  G02B27/30 ,  G02F1/1335 ,  F21V8/00 ,  G02B5/04

Abstract: A switchable backlight for a switchable privacy display apparatus comprises a collimated waveguide and an optical turning film comprising first and second arrays of elongate prismatic elements. High image luminance and image visibility is provided for off-axis viewers in a public mode of operation while in a privacy mode of operation visual security level above a perceived privacy threshold may be achieved for off-axis snoopers.

公开(公告)号：US20230099000A1

公开(公告)日：2023-03-30

申请号：US17954225

申请日：2022-09-27

Applicant: RealD Spark, LLC

Inventor： Jonathan Harrold ,  Graham J. Woodgate ,  Michael G. Robinson ,  Robert A. Ramsey ,  Ben Ihas

IPC: G02F1/13 ,  G09G3/36 ,  G09G3/34 ,  G02F1/1343 ,  G02F1/01 ,  G02F1/1335

Abstract: A switchable privacy display comprises a spatial light modulator with output polariser, a reflective polariser, a polar control liquid crystal retarder and an additional polariser. The electrodes of the polar control liquid crystal retarder are patterned with a mark. In wide angle and narrow angle operational modes, the electrodes of the liquid crystal retarder are driven such that the mark is not visible. In a mark display state, the electrodes are driven to provide visibility of the mark in reflected light to an off-axis observer.

公开(公告)号：US20220404654A1

公开(公告)日：2022-12-22

申请号：US17739996

申请日：2022-05-09

Applicant: RealD Spark, LLC

Inventor： Michael G. Robinson ,  Graham J. Woodgate ,  Jonathan Harrold

IPC: G02F1/13 ,  F21V8/00 ,  G02F1/1335 ,  B60K35/00 ,  G02F1/139

Abstract: A switchable backlight for a switchable privacy display apparatus comprises a collimated waveguide, first and second light sources and an optical turning film comprising elongate prismatic elements with facet orientations that pupillate the output of the waveguide in two orthogonal directions for each of first and second light sources. High luminance uniformity is achieved for a head-on user in privacy and public viewing modes and high uniformity of security factor is achieved for off-axis snoopers, with increased speed of privacy switch-on in privacy mode.

公开(公告)号：US11474397B2

公开(公告)日：2022-10-18

申请号：US17064405

申请日：2020-10-06

Applicant: RealD Spark, LLC

Inventor： Michael G. Robinson ,  Graham J. Woodgate ,  Robert A. Ramsey ,  Jonathan Harrold

IPC: G02F1/1335 ,  G02F1/13363 ,  G02B5/30 ,  G02F1/137 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/1347 ,  F21V8/00

Abstract: A privacy display comprises a spatial light modulator and a compensated switchable liquid crystal retarder arranged between first and second polarisers arranged in series with the spatial light modulator. In a privacy mode of operation, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction over a wide polar field. In a wide angle mode of operation, the switchable liquid crystal retardance is adjusted so that off-axis luminance is substantially unmodified.