Stereoscopic dual modulator display device using full color anaglyph

#This invention relates to backlit displays comprising solid state illumination devices, such as light-emitting diodes (LEDs). Particular embodiments provide for systems and methods for displaying stereoscopic or three-dimensional (3D) images.

#A 3D visual effect may be generated by presenting different images to a viewer's left and right eyes. Each of the left and right eye images represent different perspectives of the same scene or object. The viewer's brain combines and interprets the left and right eye images to perceive a single 3D image having the illusion of depth.

#One method of creating a 3D visual effect on a display is to provide spectrally filtered light to the viewer so that the left eye is presented with light in a first set of spectral bands (providing a left eye image) and the right eye is presented with light in a complementary, second set of spectral bands (providing a right eye image). The viewer wears spectral filtration glasses to view the spectrally separated left and right eye images. The glasses have a left eye filter allowing light within the first set of spectral bands to pass through, and blocking substantially all light which is not within the first set of spectral bands. The glasses also have a right eye filter allowing light within the second set of spectral bands to pass through, while blocking substantially all light which is not within the second set of spectral bands. The display may alternate between displaying the left and right eye images so that the left and right eye images are time-multiplexed. FIG. 1A illustrates two complementary sets of red, green and blue (R, G, B) spectral bands which may be used for displaying left and right eye images. FIG. 1A plots intensity as a function of wavelength for light having a spectral composition comprising a first set 11 of spectral bands R1, G1 and B1 (which may be used as the left eye spectral bands), and for light having a spectral composition comprising a second set 13 of spectral bands R2, G2 and B2 (which may be used as the right eye spectral bands).

#In drawings which illustrate non-limiting embodiments:

#FIG. 1A is a graph illustrating two sets of complementary RGB spectral bands of light for displaying left and right eye images;

#FIG. 1B is a graph illustrating RGB spectral bands of broadband light passed through a display modulation layer colour filter, shown superimposed over two sets of complementary RGB spectral bands of light used for displaying left and right eye images;

#Throughout the following description, specific details are set forth in order to provide a more thorough understanding to persons skilled in the art. However, well known elements may not have been shown or described in detail to avoid unnecessarily obscuring the disclosure. Accordingly, the description and drawings are to be regarded in an illustrative, rather than a restrictive, sense.

#FIG. 2 depicts a dual modulation display system 20 according to a particular embodiment. Display system 20 may be configured to perform methods of the invention. Display system 20 may operate in a 3D display mode for displaying a 3D image from 3D image data 23A. Image data 23A comprises left eye image data 23AL and right eye image data 23AR. In some embodiments, display system 20 may also operate in a two-dimensional (2D) display mode for displaying a non-3D (i.e. 2D) image from 2D image data 23B. Display system 20 comprises a display 21. Display 21 may comprise a high brightness and/or high dynamic range (HDR) display. In the illustrated embodiment, display 21 comprises a dual modulation display having a light source modulation layer 21A and a display modulation layer 21B.

#Display system 20 comprises a controller 22, which may comprise a central processing unit (CPU), one or more microprocessors, one or more field programmable gate arrays (FPGAs), one or more graphics processing units (GPUs), one or more digital signal processors (DSPs), or any combination thereof, or any other suitable processing unit(s) comprising hardware and/or software capable of functioning as described herein. Controller 22 processes input image data 23A or 23B to generate light source modulator control values 25A to drive light source modulation layer 21A, and display modulator control values 25B to drive display modulation layer 21B.