LIGHT BLUE OPTICS LTD Patent applications |
Patent application number | Title | Published |
20150248189 | Touch Sensing Systems - We describe a touch sensing system comprising a light source to project light defining a touch sheet above a surface; a camera directed to capture a touch sense image from the touch sheet, comprising light scattered by an object; and a signal processor to process the touch sense image to identify a lateral location of the object on the surface. A brightness of the projected light is modulated to define bright, touch detecting intervals and dark intervals. The camera and the light projection are synchronized such that the camera selectively captures scattered light during the touch detecting intervals and rejects ambient light during the dark intervals. The system further comprises a pen. The pen comprises a photodetector to detect the projected light, a first light source detectable by the camera, and a controller coupled to control the first light source such that it is selectively illuminated during touch detecting intervals in synchronism with modulated projected light of the touch sheet. | 09-03-2015 |
20140240293 | Touch Sensitive Display Devices - A touch sensitive device, the device comprising: a touch sensor light source to project a plane of light above a surface: a camera directed to capture a touch sense image from a region including at least a portion of said plane of light, said touch sense image comprising light scattered from said plane of light by a plurality of said objects simultaneously approaching or touching said surface; a signal processor coupled to said camera, to process a said touch sense image from said camera to identify a lateral location of each of said objects; and an output object position output, to provide output object positions for said plurality of objects; and wherein said signal processor is further configured to: input a succession of said touch sense images; process each said touch sense image to identify a plurality of candidate object touch positions; and filter said candidate object touch positions from said successive touch sense images to link said candidate object touch positions to previously identified output object positions for said plurality of objects; and update said previously identified output object positions using said linked candidate object touch positions. | 08-28-2014 |
20140232695 | Touch-Sensitive Display Devices - We describe a touch sensitive image display device including: an image projector to project a displayed image onto a surface; a touch sensor light source to project a plane of light above the displayed image; a camera to capture a touch sense image from light scattered from the plane of light by an approaching object; and a signal processor to process the touch sense image to identify a location of the object. The touch sensor light source is amplitude modulated, and signal processor is further configured to process a plurality of the touch sense images captured when said touch sensor light source is off to compensate for ambient light in a touch sense image captured when the touch sensor light source is on. | 08-21-2014 |
20130293516 | Touch Sensitive Holographic Displays - We describe a touch sensitive holographic image display device for holographically projecting a touch sensitive image at an acute angle onto a surface on which the device is placed. The device includes holographic image projection optics comprising at least one coherent light source illuminating a spatial light modulator (SLM), output optics to project a hologram onto an acute angle surface, and a remote touch sensing system to remotely detect a touch of a location within or adjacent to the holographically displayed image. A control system is configured to provide data defining an image for display, to receive detected touch data, and to control the device responsive to remote detection of a touch of a the displayed image. | 11-07-2013 |
20120224062 | HEAD UP DISPLAYS - We describe a road vehicle contact-analogue head up display (HUD) comprising: a laser-based virtual image generation system to provide a 2D virtual image; exit pupil expander optics to enlarge an eye box of the HUD; a system for sensing a lateral road position relative to the road vehicle and a vehicle pitch or horizon position; a symbol image generation system to generate symbology for the HUD; and an imagery processor coupled to the symbol image generation system, to the sensor system and to said virtual image generation system, to receive and process symbology image data to convert this to data defining a 2D image for display dependent on the sensed road position such that when viewed the virtual image appears to be at a substantially fixed position relative to said road; and wherein the virtual image is at a distance of at least 5 m from said viewer. | 09-06-2012 |
20120140299 | HOLOGRAPHIC IMAGE DISPLAY SYSTEM - This invention relates to holographic image display systems, and to related methods and processor control code. We describe a method of displaying an image holographically, the method including: inputting display image data defining said image for display; processing said image data to determine first image data representing a first spatial frequency portion of said image data and second image data representing a second spatial frequency portion of said image data, wherein said second spatial frequency is higher than said first spatial frequency; displaying a hologram of said first image data on a spatial light modulator (SLM) to form a holographically-generated intermediate real image; modulating said intermediate real image using said second image data to display said image. | 06-07-2012 |
20110109948 | HOLOGRAPHIC IMAGE DISPLAY SYSTEMS - This invention relates to methods, apparatus, and computer program code for the holographic display of images. We describe a method of displaying an image holographically. The method includes displaying a hologram on pixels of a spatial light modulator (SLM) and illuminating the SLM such that the image is displayed in pixels of a replay field (RPF) of the hologram. The method further includes subdividing the replay field into a plurality of spatially interlaced regions, and displaying holograms for each of the interlaced regions of the replay field sequentially at different times such that in an observer's eye the interlaced regions integrate to give the impression of the image and such that interference between adjacent pixels of the replay field is reduced. | 05-12-2011 |
20110002019 | HOLOGRAPHIC IMAGE DISPLAY SYSTEMS - The invention relates to techniques for speckle reduction in holographic optical systems, in particular holographic image display systems. We describe a holographic image display system for displaying an image holographically on a display surface, the system including: a spatial light modulator (SLM) to display a hologram; a light source to illuminate said displayed hologram; projection optics to project light from said illuminated displayed hologram onto said display surface to form a holographically generated two-dimensional image, said projection optics being configured to form, at an intermediate image surface, an intermediate two-dimensional image corresponding to said holographically generated image; a diffuser located at said intermediate image surface; and an actuator mechanically coupled to said diffuser to, in operation, move said diffuser to randomise phases over pixels of said intermediate image to reduce speckle in an image displayed by the system. | 01-06-2011 |
20100165429 | OPTICAL SYSTEMS - A holographic head up display (HUD) for a vehicle to display an image holographically on a curved display surface such as a windshield is disclosed. The HUD can include a spatial light modulator (SLM) to display a hologram, an illumination system to illuminate said displayed hologram, projection optics to project light from said hologram onto said display surface to form said image, and a processor configured to process said image data to generate hologram data for display on the SLM to form said image. The HUD can further include a non-volatile data memory coupled to said processor to store wavefront correction data for said display surface, and the processor can be configured to apply a wavefront correction responsive to said stored wavefront correction data when generating the hologram data to correct the image for aberration due to a shape of said display surface. | 07-01-2010 |
20100142016 | HOLOGRAPHIC IMAGE PROJECTION SYSTEMS - We describe a holographic image projection system for projecting an image at an acute angle onto a surface, the system including: a spatial light modulator (SLM) to display a hologram; an illumination system to illuminate said displayed hologram; projection optics to project light from said illuminated displayed hologram onto said surface at an acute angle form said image; and a processor having an input to receive input image data for display and an output to provide hologram data for said SLM, wherein said processor is configured to: input image data and convert this to target image data; generate from said target image data hologram data for display as a hologram on the SLM to reproduce a target image; and wherein said target image is distorted to compensate for said projection of said hologram at an acute angle to form said image. | 06-10-2010 |
20100097673 | HOLOGRAPHIC IMAGE DISPLAY SYSTEMS - This invention relates to methods and apparatus for the holographic display of images. We describe a method of compensating for spatial phase non-uniformities in a holographic image display system, the system including a substantially coherent light source illuminating an SLM ( | 04-22-2010 |
20100085276 | HOLOGRAPHIC IMAGE DISPLAY SYSTEMS - This disclosure relates to methods, apparatus, and computer program code for the holographic display of images. We describe a method of displaying an image holographically. The method includes: dividing the image into a plurality of spatial tiles; and displaying, for each tile in rapid succession, at least one hologram to reproduce an image of the tile, to give the impression of the plurality of tiles together; and wherein the method also includes controlling a shutter spatial light modulator (SLM) in a replay field of the holograms such that when each tile is displayed light for the others of the plurality of tiles is substantially blocked. | 04-08-2010 |
20100014134 | HOLOGRAPHIC IMAGE DISPLAY SYSTEM - This invention relates to holographic image display systems, and to related methods and processor control code. We describe a method of displaying an image holographically, the method including: inputting display image data defining said image for display; processing said image data to determine first image data representing a first spatial frequency portion of said image data and second image data representing a second spatial frequency portion of said image data, wherein said second spatial frequency is higher than said first spatial frequency; displaying a hologram of said first image data on a spatial light modulator (SLM) to form a holographically-generated intermediate real image; modulating said intermediate real image using said second image data to display said image. | 01-21-2010 |
20090322738 | METHODS AND APPARATUS FOR DISPLAYING IMAGES USING HOLOGRAMS - We describe a method of generating data for displaying an image defined by a plurality of holographically generated subframes for display sequentially in time to give the impression of said image, the method including: receiving data for said image for display; determining holographic data for a said subframe from target image data at a first spatial resolution derived from said received data; converting said holographic data to image subframe data for display to generate a said holographic subframe, said image subframe data having a second spatial resolution lower than said first spatial resolution; generating reconstructed image data at said first spatial resolution from said image subframe data, said reconstructed image data representing said displayed holographic subframe; adjusting said target image data using said reconstructed image data; and determining holographic data and image subframe data for a subsequent said subframe using said adjusted image data. | 12-31-2009 |
20090219591 | METHODS AND APPARATUS FOR DISPLAYING COLOUR IMAGES USING HOLOGRAMS - We describe a method of projecting a colour image on a screen holographically. The method includes: inputting colour image data including data for at least two colour planes of said image, a first, longer wavelength colour plane and a second, shorter wavelength colour plane; generating data for respective first and second holograms from said first and second colour planes, said first hologram having a greater resolution than said second hologram; and displaying said first and second holograms in turn on a common spatial light modulator (SLM) illuminated by light of respective said first and second wavelengths to project said colour image onto said screen; and wherein a scaling in resolution between said first and second holograms is dependent on scaling between said first and second wavelengths such that, when projected on said screen pixels of said image generated by said first and second holograms have substantially the same pitch. | 09-03-2009 |
20090219380 | METHODS AND APPARATUS FOR DISPLAYING IMAGES USING HOLOGRAMS - The invention relates to method, computer program code and signal processing/image display systems for displaying one or more images using holographic techniques. We describe a method of generating data for displaying an image defined by displayed image data using a plurality of holographically generated temporal subframes, the temporal subframes being displayed sequentially in time such that they are perceived as a single noise-reduced image. The method includes generating from the displayed image data holographic data for each subframe of said set of subframes such that successive replay of holograms defined by said holographic data for said subframes gives the appearance of said image, and wherein the method further includes, when generating said holographic data for a said subframe, compensating for noise in said displayed image arising from one or more previous subframes of said sequence of holographically generated subframes. | 09-03-2009 |