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Patent Issued for Pixel-Intensity Modulation Technique for Frame-Sequential stereo-3D Displays

August 5, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- ATI Technologies, ULC (Markham, Ontario, CA) has been issued patent number 8786598, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventor is Swan, Philip L. (Richmond Hill, CA).

This patent was filed on November 19, 2010 and was published online on July 22, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The present invention is generally directed to display techniques. More particularly, the present invention is directed to 3D display techniques and applications thereof.

"Frame-sequential stereoscopic display technology enables images to be displayed in 3D. In frame-sequential stereoscopic display, an alternating sequence of left- and right-perspective images are displayed, wherein the left-perspective images are intended to be viewed by a user's left eye and the right-perspective images are intended to be viewed by the user's right eye. If the left- and right-perspective images are successively displayed at an appropriate rate (e.g., approximately 60 Hz/perspective), the user will perceive the images as being in 3D.

"Frame-sequential stereoscopic images may be provided on a display (e.g., a television or other display device) that is coupled to a device (e.g., a computer or a video-game console) having a processing unit (e.g., a central-processing unit (CPU) and/or a graphics-processing unit (GPU)). In this way, the frame-sequential stereoscopic display enables a user to, for example, watch movies and/or play video games in 3D.

"Unfortunately, the quality of the frame-sequential stereoscopic display may be limited by the response time of the display. For example, if a display does not have a sufficiently high response time (which is a fairly common problem for liquid crystal displays (LCDs) in particular), then when the display is driven for frame-sequential stereoscopic 3D residual information intended for the left eye may be present in the right-perspective image and vice-versa. The residual information may appear as one or more faint ghost images. These faint ghost images may appear to the left and right of the intended image depending on the depth of the object in the 3D scene.

"One potential solution for reducing the appearance of such undesirable residual images is to use 3D technologies other than frame-sequential stereoscopic display. But these other 3D technologies typically lower the perceived resolution of the images and, therefore, are undesirable.

"Another potential solution for reducing the appearance of these undesirable residual images is to use techniques designed to increase the response time of a standard LCD display, such as black frame insertion. In black frame-insertion techniques, the total brightness is limited by reducing the 'on time' of the pixels in the panel. But one problem with this potential solution is that the black frame-insertion techniques are designed to minimize the response time that is measured and published as a specification of the display, but these techniques are not designed to reduce residual images caused by frame-sequential stereoscopic display. Consequently, it is not clear that black frame-insertion techniques would actually work to reduce the appearance of residual images that may occur in frame-sequential stereoscopic display.

"An additional potential solution for reducing the appearance of these undesirable residual images is to adjust the shuttering mechanism to mask the appearance of any residual images. But this solution is undesirable because it would cause a reduction in the perceived brightness.

"Given the foregoing, what is needed are methods, apparatuses, and systems for reducing the appearance of residual images that may occur in frame-sequential stereoscopic-3D displays."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "Embodiments of the present invention meet the above-described needs by providing methods, apparatuses, and systems of pixel-intensity modulation for frame-sequential, stereo-3D displays.

"For example, an embodiment of the present invention provides a method for preparing images for frame-sequential stereoscopic display, the frame-sequential stereoscopic display including an alternating sequence of left- and right-perspective images for display. The method includes identifying pixels that modulate due to the alternating sequence of left- and right-perspective images of the frame-sequential stereoscopic display. The method also includes processing the pixels to reduce one or more residual images caused by the alternating sequence of left- and right-perspective images of the frame-sequential stereoscopic display.

"Another embodiment of the present invention provides a processing unit for preparing images for frame-sequential stereoscopic display, the frame-sequential stereoscopic display including an alternating sequence of left- and right-perspective images for display. The processing unit is configured to identify pixels that modulate due to the alternating sequence of left- and right-perspective images of the frame-sequential stereoscopic display. The processing unit is also configured to process the pixels to reduce one or more residual images caused by the alternating sequence of left- and right-perspective images of the frame-sequential stereoscopic display. In an embodiment, the processing unit may be embodied in software, using, for example, a hardware-description language.

"A further embodiment of the present invention provides a system, comprising a processing unit and a display. The processing unit is configured to prepare images for frame-sequential stereoscopic display. The frame-sequential stereoscopic display includes an alternating sequence of left- and right-perspective images for display. In order to prepare the images for frame-sequential stereoscopic display, the processing unit is configured to identify pixels that modulate due to the alternating sequence of left- and right-perspective images of the frame-sequential stereoscopic display and further configured to process the pixels to reduce one or more residual images caused by the alternating sequence of left- and right-perspective images of the frame-sequential stereoscopic display. The display is configured to display the images prepared by the processing unit.

"Further features and advantages of the invention, as well as the structure and operation of various embodiments of the invention, are described in detail below with reference to the accompanying drawings. It is noted that the invention is not limited to the specific embodiments described herein. Such embodiments are presented herein for illustrative purposes only. Additional embodiments will be apparent to persons skilled in the relevant art(s) based on the teachings contained herein."

For the URL and additional information on this patent, see: Swan, Philip L.. Pixel-Intensity Modulation Technique for Frame-Sequential stereo-3D Displays. U.S. Patent Number 8786598, filed November 19, 2010, and published online on July 22, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8786598.PN.&OS=PN/8786598RS=PN/8786598

Keywords for this news article include: ATI Technologies ULC.

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Source: Journal of Technology


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