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Researchers Submit Patent Application, "3d Display Device, 3d Display System and Method for Displaying 3d Images", for Approval

March 5, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor Xu, Shuang (Shenzhen, CN), filed on November 2, 2012, was made available online on February 20, 2014.

The patent's assignee is Nvidia Corporation.

News editors obtained the following quote from the background information supplied by the inventors: "Ordinary 2D display system mainly comprises a display device and a control means connected to the display device (e.g. the host of a computer, cell phone, etc.). The drive means in the display device (e.g. the graphic card) receives video signals from the control means, and control image-displaying on the display screen of the display device according to the video signals. A standard video transmission protocol is used between the control means and the drive means in the display device. In the video signals based on a standard video transmission protocol from the control means, the vertical blank of each frame period constitutes a pretty short portion of each frame period, e.g. the vertical blank of each frame period constitutes 1%-2% of each frame period in the case of video signals based on a standard DVI (Digital Video Interface) protocol.

"Like the 2D display system, a 3D display system also comprises a display device and a control means connected to the display device. And the drive means in the display device (e.g. the graphic card) receives video signals from the control means, and control image-displaying on the display screen of the display device according to the video signals. The difference is that images for left eye are different from the images for right eye in the principle of the 3D display system, what left eye sees are images corresponding to the left eye, and what right eye sees are images corresponding to the right eye, so that the 3D display system also comprise 3D glasses which are controlled. Specifically, two sets of images, one set for left eye and one set for right eye are actually displayed on the display device. Each of frame period in the video signals corresponds to image for left eye and image for right eye in turn. Correspondingly, images for left eye and images for right eye appear on the display screen in turn. When showing one frame of image for one eye, the other eye which is not supposed to see that frame of image is blocked by controlling the 3D glasses.

"In addition, each frame of image is seen by one eye, but during the scan stage of that frame image (the transmission stage of the image), the image should not be seen by the eye. Only in the stage when the scan of the image is completed (the vertical blank stage) should light be passed (i.e. light are allowed to enter the eye). And the level of feeling about the frame of image that the eye experiences is the integral of brightness of the image and time of feeling. So that in the present art of 3D display, both lenses of the 3D glasses are blocked via control (in general the lenses are turned to black by switching on current). The vertical blank of each frame of video signals constitutes a longer portion of each frame period, in order to ensure that the viewers see the video images with enough brightness and clarity. However, the duration of the vertical blank of each frame of video signals cannot be extended without limitation as the phenomenon of ghosting has to be avoid. Furthermore, the backlight of the backlight means in the 3D display device is continuously in a state of being turned on.

"For example, when the video signals are based on a DVI protocol, the vertical blank constitutes at most 32% of each frame of video signals, otherwise there will be a problem of ghosting in the present art, as shown in FIG. 1. Also, corresponding to each frame of video signals, only one of the lenses of the 3D glasses is pervious to light during the vertical blank of that frame of video signal. In FIG. 1, in the coordinate of video signals, '1' represents that the frame of video signals is being transmitted while '0' represents that the transmission of the frame of video signals is completed, i.e. the vertical blank. In the coordinate of the state of lenses, '0' represents that both of the lenses are blocked, '1' represents that the left lens is pervious to light and '-1' represents that the right lens is pervious to light. The backlight of the backlight means is continuously in a state of being turned on.

"Thus, only a portion of the brightness (corresponding to the vertical blank) provided by the backlight means enters the eyes of the viewer(s). Besides, longer vertical blanks constitute a larger portion of bandwidth of digital link of the video signals. And the longer vertical blanks also demand anon-standard video transmission protocol between the control means and the drive means. So that the ordinary drive means has to be altered (i.e. a non-standard drive means is used). However, the non-standard drive means is non beneficial for further update of the product.

"Therefore, there is a need of providing a 3D display device, a 3D display system and a method for displaying 3D image to solve the above problems."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "In order to solve the above-mentioned problems, according to one aspect of the present invention, a 3D display device is provided which comprises: a display screen; a backlight means including a pulse light source; and a drive means used to receive video signals which are based on a standard video transmission protocol, so as to control the display screen to display 3D images according to the video signals, and control the pulse light source to emit a backlight pulse in the form of pulse during a vertical blank of each frame period of the video signals, wherein the duration of the backlight pulse is shorter than that of the vertical blank.

"Preferably, the peak power of the backlight pulse is greater than 100 W.

"Preferably, the peak power of the backlight pulse is 2 KW.

"Preferably, the video signals are based on a standard DVI protocol, with the vertical blank of each frame period thereof constituting 1%-2% of each frame period; or the video signals are based on a standard HDMI protocol, with the vertical blank of each frame period thereof constituting 1%-2% of each frame period; or the video signals are based on a standard DP protocol, with the vertical blank of each frame period thereof constituting 1%-2% of each frame period.

"Preferably, the pulse light source is a pulse-LED or a semiconductor laser.

"Preferably, the transmission rate of the video signals is greater than 120 frames/s.

"Preferably, the backlight pulse has two types, a first backlight pulse and a second backlight pulse, which are emitted alternately.

"Preferably, the first backlight pulse includes a first pulse and a second pulse emitted in sequence; the second backlight pulse includes a third pulse and a fourth pulse emitted in sequence; wherein the first pulse is shorter than the second pulse, and the third pulse is longer than the fourth pulse; or the first pulse is longer than the second pulse, and the third pulse is shorter than the fourth pulse.

"According to another aspect of the present invention, a 3D display system is provided which comprises: a control means which outputs video signals based on a standard video transmission protocol; a 3D display device which comprises a display screen; a backlight means including a pulse light source; and a drive means connected to the control means to receive the video signals, so as to control the display screen to display 3D images according to the video signals, and control the pulse light source to emit a backlight pulse in the form of pulse during a vertical blank of each frame period of the video signals, wherein the duration of the backlight pulse is shorter than that of the vertical blank; and 3D glasses which are connected to the control means in a wired or wireless manner, so as to block two lenses thereof alternately in equal block periods according to the video signals, wherein each of the block periods corresponds to each frame period of the video signals.

"Preferably, the peak power of the backlight pulse is greater than 100 W.

"Preferably, the peak power of the backlight pulse is 2 KW.

"Preferably, the video signals are based on a standard DVI protocol, with the vertical blank of each frame period thereof constituting 1%-2% of each frame period; or the video signals are based on a standard HDMI protocol, with the vertical blank of each frame period thereof constituting 1%-2% of each frame period; or the video signals are based on a standard DP protocol, with the vertical blank of each frame period thereof constituting 1%-2% of each frame period.

"Preferably, the pulse light source is a pulse-LED or a semiconductor laser.

"Preferably, the transmission rate of the video signals is greater than 120 frames/s.

"Preferably, the backlight pulse has two types, a first backlight pulse and a second backlight pulse, which are emitted alternately; the 3D glasses block one of the two lenses thereof according to the finish of the first backlight pulse, and block the other one of the two lenses thereof according to the finish of the second backlight pulse.

"Preferably, the first backlight pulse includes a first pulse and a second pulse emitted in sequence; the second backlight pulse includes a third pulse and a fourth pulse emitted in sequence; wherein the first pulse is shorter than the second pulse, and the third pulse is longer than the fourth pulse; or the first pulse is longer than the second pulse, and the third pulse is shorter than the fourth pulse.

"According to yet another aspect of the present invention, a method for displaying 3D images is provided which comprises the steps of: receiving video signals which are based on a standard video transmission protocol; displaying 3D images according to the video signals, and emitting a backlight pulse in the form of pulse during a vertical blank of each frame period of the video signals, wherein the duration of the backlight pulse is shorter than that of the vertical blank.

"Preferably, the peak power of the backlight pulse is greater than 100 W.

"Preferably, the peak power of the backlight pulse is 2 KW.

"Preferably, the backlight pulse has two types, a first backlight pulse and a second backlight pulse, which are emitted alternately.

"Following are the effectiveness of the present invention:

"In the present 3D display device, the drive means receives video signals which are based on a standard video transmission protocol, so as to control the display screen to display 3D images according to the video signals, and control the pulse light source to emit a backlight pulse in the form of pulse during the vertical blank of each frame period of the video signals, and the duration of the backlight pulse is shorter than that of the vertical blank. It will be understand by people skilled in the art that the power of the above mentioned backlight pulse should be much higher than that of the ordinary continuous backlight.

"It will be understand that all of the light corresponding to each frame of the video signals from the display device will enter one of the lenses of the viewer's glasses, so that the degrading of light is avoided. Besides, the images on the display screen is seen by the viewers only during the time when the backlight is being emitted, which causes the vertical blank of the video signals can only constitute a pretty small bandwidth of the digital link of the video signals, so that the drive means can receive video signals which are based on a standard video transmission protocol, so as to control the displaying of 3D images. Thus, the standard drive means can be used, which is beneficial for further update of the drive means.

"A serial of simplified conceptions are incorporated into the summary of the invention, which will be further described in more detail in the detailed description. The summary of the invention neither implies that it is intended to limit the essential features and necessary technical features of the technical solution to be protected, nor implies that it is intended to define the protection scope of the technical solution to be protected.

"Advantages and features of the present invention will be described in detail below in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

"The following drawings of the present invention as a part of the present invention herein are used for understanding of the present invention, the implementations and the descriptions thereof are illustrated in the drawings for explaining the principle of the present invention. In the drawings.

"FIG. 1 illustrates a timing diagram of the video signals and the state of lenses of the 3D glasses in the present art of 3D display;

"FIG. 2 illustrates a schematic component view of the 3D display device in accordance with the embodiment of the present invention;

"FIG. 3 illustrates a timing diagram of the video signals received and backlight emitted by the 3D display device in accordance with the embodiment of the present invention.

"FIG. 4 and FIG. 5 illustrate the schematic enlarged views of two backlight pulses in sequence in FIG. 3 respectively;

"FIG. 6 illustrates a schematic component view of the 3D display system in accordance with the embodiment of the present invention;

"FIG. 7 illustrates a timing diagram of the video signals, the emitted backlight and the state of lenses of the 3D glasses in the 3D display system in accordance with the embodiment of the present invention."

For additional information on this patent application, see: Xu, Shuang. 3d Display Device, 3d Display System and Method for Displaying 3d Images. Filed November 2, 2012 and posted February 20, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4166&p=84&f=G&l=50&d=PG01&S1=20140213.PD.&OS=PD/20140213&RS=PD/20140213

Keywords for this news article include: Electronics, Semiconductor, Nvidia Corporation.

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Source: Electronics Newsweekly


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