News Column

Researchers Submit Patent Application, "Three-Dimensional Image Display Device", for Approval

May 1, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors JUNG, KYUNGHO (Bundang-gu, KR); KIM, JINHWAN (Suwon-si, KR); SUNG, Jeongmin (Suwon-si, KR); YOON, ILYONG (Seoul, KR); YUN, Haeyoung (Suwon-si, KR); JEONG, YONG CHEOL (Yongin-si, KR), filed on February 20, 2013, was made available online on April 17, 2014.

The patent's assignee is Samsung Display Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "The disclosure relates to a display device. More particularly, the disclosure relates to a glassless-type three-dimensional display device capable of displaying a three-dimensional.

"In general, a three-dimensional ('3D') image display device displays a 3D image using a binocular disparity method, which provides a left-eye image and a right-eye image, which have a binocular disparity, to a left eye and a right eye of a viewer, respectively.

"The binocular disparity method is typically classified into a glass type method and a glassless type method. The glass type method changes a polarization direction of the left-eye image and the right-eye image using a patterned retarder or alternately displays the left-eye image and the right-eye image, thereby displaying the 3D image.

"A glassless-type 3D image display device typically includes a barrier panel or a liquid crystal lens panel to provide optical axes for the left-eye image and the right-eye image. The glassless-type 3D image display device employing the liquid crystal lens panel may control an operation mode of the liquid crystal lens panel and provide the left-eye image and the right-eye image to the left and right eyes of the viewer.

"The liquid crystal lens panel typically includes a first substrate, a second substrate facing the first substrate, a first electrode disposed on the first substrate, a second electrode disposed on the second substrate, and a liquid crystal layer disposed between the first substrate and the second substrate. The liquid crystal lens panel controls voltages applied to the first and second electrodes, respectively, and changes an arrangement of liquid crystal molecules of the liquid crystal layer, thereby controlling the operation mode thereof In the liquid crystal lens panel, the liquid crystal molecules may have slow response speed, and the change of the operation mode of the liquid crystal lens panel may be thereby slow, such that the left-eye image may be perceived by the left eye of the viewer or the right-eye image may be perceived by the right eye of the viewer."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "The disclosure provides a three-dimensional ('3D') image display device with improved brightness of an image, in which left-eye images is effectively prevented from being mixed with right-eye images.

"Exemplary embodiments of the invention provide a 3D image display device includes a display panel which displays a frame image and a liquid crystal lens panel. In such an embodiment, the display panel includes a first pixel and a second pixel different from the first pixel. In such an embodiment, the frame image includes a positive frame image and a negative frame image. In such an embodiment, the positive frame image includes a first right-eye image displayed in the first pixel and a first left-eye image displayed in the second pixel and the negative frame image includes a second left-eye image displayed in the first pixel and a second right-eye image displayed in the second pixel. In such an embodiment, the liquid crystal lens panel is disposed on the display panel to provide the first and second right-eye images to a right eye of a viewer and provide the first and second left-eye images to a left eye of a viewer. In such an embodiment, the display panel displays the positive frame image and the negative frame image during an n-th frame period (n is a natural number) in the order of the positive frame image and the negative frame image and displays the negative frame image and the positive frame image during an (n+1)-th frame image in the order of the negative frame image and the positive frame image.

"In an exemplary embodiment, the liquid crystal lens panel has a driving frequency equal to or lower than one-fourth of a driving frequency of the display panel.

"In an exemplary embodiment, an operation mode of the liquid crystal lens panel is changed at a time point at which the positive frame image is changed to the negative frame image and at a time point at which the negative frame image is changed to the positive frame image.

"In an exemplary embodiment, the 3D image display device further includes a backlight unit which provides light to the display panel during a portion of the time period during which the positive frame image is displayed and a portion of the time period during which the negative frame image is displayed.

"In an exemplary embodiment, a three-dimensional 3D image display device includes: a display panel which includes h pixels and displays a frame image, where h is a natural number equal to or greater than 2, and the frame image includes: a positive frame image including first to h-th positive multi-view point images displayed through the h pixels in a first order and having different view points from each other; and a negative frame image including first to h-th negative multi-view point images displayed through the h pixels in a second order and having different view points from each other; and a liquid crystal lens panel disposed on the display panel, where the liquid crystal lens panel provides an i-th positive multi-view point image among the first to h-th positive multi-view point images and a j-th negative multi-view point image among the first to h-th negative multi-view point images to a right eye of a viewer and provide a j-th positive multi-view point image among the first to h-th positive multi-view point images and an i-th negative multi-view point image among the first to h-th negative multi-view point images to a left eye of the viewer, where i is a natural number equal to or less than h, and j is a natural number equal to or less than h and different from i, where the display panel sequentially displays the positive frame image and the negative frame image during an n-th frame period and sequentially displays the negative frame image and the positive frame image during an (n+1)-th frame period, where n is a natural number.

"According to exemplary embodiments, the number of the operation mode changes of the liquid crystal lens panel is reduced when compared to the number of the operation mode changes of a convention liquid crystal lens panel, thereby substantially reducing the image confusion phenomenon, which is caused by the response speed of liquid crystals. In such embodiments, when a level of the image confusion is maintained substantially in the same as a level of the image confusion of the conventional 3D image display device, brightness of the display panel is substantially improved.

BRIEF DESCRIPTION OF THE DRAWINGS

"The above and other features of the invention will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which:

"FIG. 1 is a schematic cross-sectional view showing an exemplary embodiment of a three-dimensional ('3D') image display device according to the invention;

"FIG. 2 is a block diagram showing the 3D image display device shown in FIG. 1; FIG. 3 is a plan view showing a portion of an exemplary embodiment of a display panel shown in FIG. 2;

"FIG. 4A is a plan view showing a positive frame image displayed on the display panel shown in FIG. 3;

"FIG. 4B is a plan view showing a negative frame image displayed on the display panel shown in FIG. 3;

"FIG. 5 is a cross-sectional view showing a portion of a liquid crystal lens panel shown in FIG. 1;

"FIG. 6A is a cross-sectional view showing an exemplary embodiment of a liquid crystal lens panel operated in a first mode with a first driving voltage;

"FIG. 6B is a cross-sectional view showing an exemplary embodiment of a liquid crystal lens panel operated in a second mode with a second driving voltage;

"FIG. 7 is a signal timing diagram showing a vertical start signal, gate signals, a frame data, a mode change signal, an operation mode of the liquid crystal lens panel, and a backlight-on signal of an exemplary embodiment of a display panel according to the invention;

"FIG. 8 is a view showing a frame image corresponding to the frame data of FIG. 7;

"FIGS. 9A and 9B are views showing level of an image confusion caused by the liquid crystal lens panel according to period and a turn-on period of the backlight-on signal;

"FIG. 10 is a signal timing diagram showing a vertical start signal, gate signals, a frame data, a mode change signal, an operation mode of the liquid crystal lens panel, and a backlight-on signal of an alternative exemplary embodiment of a display panel according to the invention;

"FIG. 11 is a view showing a frame image corresponding to the frame data of FIG. 10;

"FIG. 12 is a plan view showing a portion of an alternative exemplary embodiment of a 3D image display device according the invention;

"FIG. 13A is a plan view showing a positive frame image displayed on the display panel shown in FIG. 12;

"FIG. 13B is a plan view showing a negative frame image displayed on the display panel shown in FIG. 12;

"FIGS. 14A and 14B are views showing images perceived by a viewer in accordance with the operation mode of the liquid crystal lens panel when the viewer is at a first position; and

"FIGS. 15A and 15B are views showing images perceived by a viewer in accordance with the operation mode of the liquid crystal lens panel when the viewer is at a second position."

For additional information on this patent application, see: JUNG, KYUNGHO; KIM, JINHWAN; SUNG, Jeongmin; YOON, ILYONG; YUN, Haeyoung; JEONG, YONG CHEOL. Three-Dimensional Image Display Device. Filed February 20, 2013 and posted April 17, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3723&p=75&f=G&l=50&d=PG01&S1=20140410.PD.&OS=PD/20140410&RS=PD/20140410

Keywords for this news article include: Samsung Display Co. Ltd.

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Source: Politics & Government Week