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公开(公告)号：US20220365361A1
公开(公告)日：2022-11-17
申请号：US17731452
申请日：2022-04-28
申请人： RealD Spark, LLC
IPC分类号： G02B30/27
摘要： A directional display may include a waveguide. The waveguide may include light extraction features arranged to direct light from an array of light sources by total internal reflection to an array of viewing windows and a reflector arranged to direct light from the waveguide by transmission through extraction features of the waveguide to the same array of viewing windows. A further spatially multiplexed display device comprising a spatial light modulator and parallax element is arranged to cooperate with the illumination from the waveguide. An efficient and bright autostereoscopic display system with low cross talk and high resolution can be achieved.
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公开(公告)号：US11474396B2
公开(公告)日：2022-10-18
申请号：US17064237
申请日：2020-10-06
申请人： RealD Spark, LLC
IPC分类号： G02F1/1335 , G02F1/13363 , G02B5/30 , G02F1/137 , G02F1/13 , G02F1/1337 , G02F1/1347 , F21V8/00
摘要： 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.
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公开(公告)号：US11287878B2
公开(公告)日：2022-03-29
申请号：US17121551
申请日：2020-12-14
申请人： RealD Spark, LLC
IPC分类号： G09G5/00 , G06F3/01 , B60K35/00 , F21V8/00 , H04N13/32 , H04N13/356 , G02B30/33 , G09G5/10 , H04N13/30
摘要： Disclosed is an imaging directional backlight including an array of light sources, and a control system arranged to provide variable distribution of luminous fluxes, scaled inversely by the width associated with the respective light sources in the lateral direction, across the array of light sources. The luminous intensity distribution of output optical windows may be controlled to provide desirable luminance distributions in the window plane of an autostereoscopic display, a directional display operating in wide angle 2D mode, privacy mode and low power consumption mode. Image quality may be improved and power consumption reduced.
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公开(公告)号：US11287713B2
公开(公告)日：2022-03-29
申请号：US17175096
申请日：2021-02-12
申请人： RealD Spark, LLC
IPC分类号： G02F1/137 , F21V8/00 , G06F3/044 , G02F1/13363 , G02F1/13 , G02F1/1333 , G02F1/1335 , G02F1/1337 , G02F1/1343 , G02F1/139
摘要： A switchable privacy display apparatus comprises a polarised output spatial light modulator, and an additional polariser. A reflective polariser, switchable liquid crystal polar control retarder, passive polar control retarders and air gap are arranged between the display output polariser and additional polariser. The passive retarders are arranged to provide no phase difference to polarised light from the spatial light modulator for on-axis light; and simultaneously provide a non-zero phase difference for polarised light in off-axis directions. The polar control retarders are further arranged to achieve low reflectivity for light propagating through the air gap. A switchable privacy display that can be conveniently assembled at low cost can be provided with high contrast images for display users while maintaining high visual security level for off-axis snoopers.
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公开(公告)号：US20220090758A1
公开(公告)日：2022-03-24
申请号：US17501251
申请日：2021-10-14
申请人： RealD Spark, LLC
IPC分类号： F21V7/00 , F21V3/00 , F21V9/30 , H01L25/075
摘要： An illumination apparatus comprises a first substrate; an optical structure; an array of light emitting elements disposed between the first substrate and the optical structure and an array of passive optical nanostructures disposed between the first substrate and the optical structure. Each of the passive optical nanostructures are disposed on a respective one of the light emitting elements and each passive optical nanostructure comprises an air gap. Each passive optical nanostructure is disposed between its respective light emitting element and the optical structure, wherein each passive optical nanostructure is configured to receive light emitted by its respective light emitting element, pass the received light, and output the pass light towards the optical structure.
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公开(公告)号：US20220059052A1
公开(公告)日：2022-02-24
申请号：US17390168
申请日：2021-07-30
申请人： RealD Spark, LLC
摘要： A control system for a switchable privacy display apparatus comprises an ambient light sensor and a display luminance controller arranged to control the luminance of the display in response to measured illuminance. High image visibility is provided for public mode operation while in privacy mode visual security level above a perceived privacy threshold may be obtained by means of control of image luminance, in response to the output of the ambient light sensor.
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公开(公告)号：US11115647B2
公开(公告)日：2021-09-07
申请号：US16181157
申请日：2018-11-05
申请人： RealD Spark, LLC
IPC分类号： H04N13/30 , F21V8/00 , G02F1/295 , G02F1/365 , G02F1/1335 , G02F1/13 , G02F1/13363 , G02F1/1337 , G02F1/137 , G02F1/13357 , G02F1/1347
摘要： An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. The directional backlight may be arranged to switch between at least a first wide angular luminance profile mode and a second narrow angular luminance profile mode. The directional backlight is arranged to illuminate an LCD with a bias electrode arranged to switch liquid crystal directors in black state pixels between a first wide angular contrast profile mode and a second narrow angular contrast profile mode. Performance of privacy operation for off-axis snoopers is enhanced in comparison to displays with only directional backlights or switchable contrast properties.
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公开(公告)号：US20210271121A1
公开(公告)日：2021-09-02
申请号：US17175096
申请日：2021-02-12
申请人： RealD Spark, LLC
IPC分类号： G02F1/137 , G02F1/13363 , G02F1/13 , G02F1/1333 , G02F1/1335 , F21V8/00 , G02F1/1337 , G02F1/1343 , G02F1/139
摘要： A switchable privacy display apparatus comprises a polarised output spatial light modulator, and an additional polariser. A reflective polariser, switchable liquid crystal polar control retarder, passive polar control retarders and air gap are arranged between the display output polariser and additional polariser. The passive retarders are arranged to provide no phase difference to polarised light from the spatial light modulator for on-axis light; and simultaneously provide a non-zero phase difference for polarised light in off-axis directions. The polar control retarders are further arranged to achieve low reflectivity for light propagating through the air gap. A switchable privacy display that can be conveniently assembled at low cost can be provided with high contrast images for display users while maintaining high visual security level for off-axis snoopers.
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公开(公告)号：US11106103B2
公开(公告)日：2021-08-31
申请号：US16591105
申请日：2019-10-02
申请人： RealD Spark, LLC
IPC分类号： G02F1/137 , G02F1/13 , G02F1/1335
摘要： A control system for a switchable privacy display apparatus comprises sensors arranged to determine device location, operating environment, document type, application type and further comprises a privacy policy for control of privacy images. High image visibility is provided for public mode operation while in privacy mode a high visual security level may be obtained by means of control of image luminance, contrast and white point in response to the privacy policy.
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公开(公告)号：US20210263209A1
公开(公告)日：2021-08-26
申请号：US17178936
申请日：2021-02-18
申请人： RealD Spark, LLC
摘要： An illumination apparatus comprises a first substrate, an optical structure, an array of light emitting elements disposed on the first substrate and between the first substrate and the optical structure, and a mask comprising a plurality of apertures therein. The optical structure is configured to receive light emitted by the array of light emitting elements, direct the received light into a direction away from the first substrate, direct at least some of the light which has been directed away from the first substrate back towards the first substrate, and direct at least some of the light which has been directed back towards the first substrate through the plurality of apertures of the mask.
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