News Column

Patent Application Titled "3d Display" Published Online

June 5, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventor Brown Elliott, Candice Hellen (Santa Rosa, CA), filed on November 9, 2012, was made available online on May 22, 2014.

The assignee for this patent application is Samsung Display Co., Ltd.

Reporters obtained the following quote from the background information supplied by the inventors: "Creating a 3D experience, or the illusion of depth, for a viewer from a two dimensional display panel typically involves displaying a pair of two dimensional images that are slightly offset from each other. The two offset images represent two perspectives of the same scene or object, with deviations that match the perspectives that each eye sees with binocular vision. One of the two images is presented to the viewer's left eye and the other to the viewer's right eye. The viewer's brain then combines these images to perceive depth (known as stereopsis).

"There are a variety of different methods for providing the separate images to each eye. In, for example, the time-sequential method using shutter glasses, the display screen alternately displays the left eye and right eye images in a determined time period, such as every other frame. The viewer wears glasses that alternately transmit light to the left eye and the right eye in synchronization with the display screen. The glasses, referred to as shutter glasses or active glasses, block the right eye view when the left eye image is displayed on the display screen, and then block the left eye view when the right eye image is displayed on the display screen. FIG. 1 illustrates a time sequence display of an image using shutter glasses 10 for creating stereopsis. In the first step 11, the left eye image 13 is seen by the left eye through the opening in the shutter glasses 10 and the right eye view 15 is blocked. In the second step 12, the left eye view of the right eye image 16 is blocked while the right eye views the right eye image 16 through the shutter glasses 10. When such a sequence is performed fast enough, typically at a rate of 60 Hz or more, the viewer does not perceive the switching between the two images, but instead the viewer's brain integrates the two offset images into a single, 3D image.

"In other methods, referred to as auto-stereoscopic, the viewer is not required to wear glasses. For instance, in the parallax barrier method, as illustrated in FIG. 2, the image for the left eye 21 and the image for the right eye 22 are interleaved for each frame. The display panel includes a parallax barrier 23 having a series of slits 24 positioned so that the right eye image is directed toward and viewed only by the right eye 26, and the left eye image is directed toward and viewed only by the left eye 28. The slits are small enough that they are not perceived by the viewer, and instead, the viewer's brain integrates the images received into the left and right eyes of the viewer into a single, 3D image."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventor's summary information for this patent application: "A method for displaying images in three dimensions on a display system is provided that includes receiving into the display system right eye image data and left eye image data for each pixel of the image; calculating a common image from the right eye image data and left eye image data, the common image including image information that is common to both the right eye image and the left eye image; calculating a left residual image from the common image and the left eye image data, the left residual image including image information from the left eye image data that creates depth perception; calculating a right residual image from the common image and the right eye image data, the right residual image including image information from the right eye image data that creates depth perception; and sequentially displaying the common image, the right residual image and the left residual image on the display system in a predetermined sequence. Calculating the common image from the right eye image data and the left eye image data may include, for each pixel, determining a minimum value between the right eye image data and the left eye image data. Calculating the left residual image may include, for each pixel, subtracting the left eye image data from the common image. Calculating the right residual image may include, for each pixel, subtracting the right eye image data from the common image. The predetermined sequence may be the common image, followed by the right residual image, followed by the common image, followed by the left residual image.

"The display system may include a display panel connected to a data processing module, the right eye image data and left eye image data is received into the data processing module, the data processing module calculates the common image, the left residual image and the right residual image and the display panel displays the common image, the left residual image and the right residual image.

"The display system may include shutter glasses, and the method may further include synchronizing a state of the shutter glasses with the predetermined sequence. The state of the shutter glasses allows both eyes of a viewer to see through the glasses when the common image is displayed, the state of the shutter glasses allows a left eye of a viewer, but not a right eye of the viewer, to see through the glasses when the left residual view is displayed, and the state of the shutter glasses allows a right eye of a viewer, but not a left eye of the viewer, to see through the glasses when the right residual image is displayed.

"The display system may include a backlight including an array of individually controllable multi-color light emitters and a display panel that spatially modulates light from the backlight, where calculating the left residual image includes calculating a separate left residual image for each color of multi-color light emitters in the backlight; calculating the right residual image includes calculating a separate right residual image for each color of multi-color light emitters in the backlight; and the predetermined sequence includes displaying the common image with all colors in the backlight and alternately displaying the right residual image and left residual image for different colors in the backlight.

"The display panel may include a parallax barrier, and the method may further include creating an interleaved image by interleaving the left residual image and right residual image and synchronizing a state of the parallax barrier with the predetermined sequence, where the predetermined sequence includes displaying the left residual image and right residual image as the interleaved image. The state of the parallax barrier is off when the common image is displayed and the state of the parallax barrier is on when the interleaved image is displayed. A prefilter may be applied to the left eye image data and right eye image data to reduce a resolution difference between the common image and the interleaved image.

"The display panel may include a parallax barrier, and the method may further include calculating an odd interleaved image by interleaving the left residual image and right residual image with a first portion of the left residual image in a first position of the odd interleaved image; calculating an even interleaved image by interleaving the left residual image and right residual image with a first portion of the right residual image in a first position of the even interleaved image; and synchronizing a state of the parallax barrier with the predetermined sequence; where the predetermined sequence includes displaying the left residual image and right residual image as the odd interleaved image and the even interleaved image

"The display system may include a display panel and a directional backlight, and the method may further include synchronizing a direction the directional backlight directs light through the display panel with the predetermined sequence, wherein the backlight directs light to both eyes of a viewer when the common image is displayed, the backlight directs light to a left eye of the viewer when the left residual image is displayed, and the backlight directs light to a right eye of the viewer when the right residual image is displayed.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 illustrates a time-sequential method for 3D display.

"FIG. 2 illustrates a parallax barrier method for 3D display.

"FIG. 3 a typical left eye image and right eye image that are offset from each other.

"FIG. 4 illustrates offset left eye and right eye images and resulting common, left residual and right residual images of an example embodiment.

"FIG. 5 illustrates a 3D display system that uses shutter glasses for use with the method of the embodiments.

"FIG. 6 illustrates a display system that uses a field sequential color display for use with the method of the embodiments.

"FIG. 7 illustrates a display system for displaying 3D images using a parallax barrier for use with the method of the embodiments.

"FIGS. 8A to 8D illustrate operation of a display system having a field sequential LC parallax barrier for use with the method of the embodiments.

"FIG. 9 illustrates a display system having a directional backlight system for use with the methods of the embodiments."

For more information, see this patent application: Brown Elliott, Candice Hellen. 3d Display. Filed November 9, 2012 and posted May 22, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4593&p=92&f=G&l=50&d=PG01&S1=20140515.PD.&OS=PD/20140515&RS=PD/20140515

Keywords for this news article include: Information Technology, Samsung Display Co. Ltd, Information and Data Processing.

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Source: Politics & Government Week