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Patent Issued for Image Display Device Capable of Switching 2D Mode and 3D Mode

September 3, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- A patent by the inventor Hwang, Kwangjo (Gyeonggi-do, KR), filed on December 22, 2011, was published online on August 19, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8810569 is assigned to LG Display Co., Ltd. (Seoul, KR).

The following quote was obtained by the news editors from the background information supplied by the inventors: "Embodiments of the invention relate to an image display device capable of selectively implementing a two-dimensional plane image (hereinafter referred to as `2D image`) and a three-dimensional stereoscopic image (hereinafter referred to as `3D image`).

"Recently, an image display device may selectively implement a 2D image and a 3D image due to the development of various contents and circuit technology. The image display device implements the 3D image using a stereoscopic technique or an autostereoscopic technique.

"The stereoscopic technique, which uses a parallax image between left and right eyes of a user with a high stereoscopic effect, includes a glasses type method and a non-glasses type method, both of which have been put to practical use. In the non-glasses type method, an optical plate such as a parallax barrier for separating an optical axis of the parallax image between the left and right eyes is generally installed in front of or behind a display screen. In the glasses type method, left and right eye images each having a different polarization direction are displayed on a display panel, and a stereoscopic image is implemented using polarized glasses or liquid crystal (LC) shutter glasses.

"An LC shutter glasses type image display alternately displays a left eye image and a right eye image on a display element every one frame and opens and closes a left eyeglass and a right eyeglass of LC shutter glasses in synchronization with a display timing, thereby implementing the 3D image. The LC shutter glasses open only the left eyeglass during odd-numbered frame periods, in which the left eye image is displayed, and open only the right eyeglass during even-numbered frame periods, in which the right eye image is displayed, thereby making binocular disparity in a time division method. In the LC shutter glasses type image display, because the LC shutter glasses are turned on in a short period of time, a luminance of the 3D image is low. Further, a 3D crosstalk is extremely generated because of the synchronization between the display element and the LC shutter glasses and the ON/OFF conversion response characteristic.

"As shown in FIG. 1, a polarized glasses type image display includes a patterned retarder 2 attached to a display panel 1. The polarized glasses type image display alternately displays left eye image data L and right eye image data R on the display panel 1 every one horizontal line and converts polarization characteristics of light incident on polarized glasses 3 using the patterned retarder 2. Through such an operation of the polarized glasses type image display, a left eye image and a right eye image may be spatially divided, thereby implementing a 3D image.

"In the polarized glasses type image display, because the left eye image and the right eye image are adjacently displayed on the adjacent horizontal lines of the display panel 1, a range of a vertical viewing angle, in which a crosstalk is not generated, is very narrow. The crosstalk is generated when a doubled image of the left eye image and the right eye image is displayed at a location of the vertical viewing angle. To prevent the crosstalk in the polarized glasses type image display, as shown in FIG. 2, a method for forming black stripes BS in an area of a patterned retarder 2 to thereby widen a vertical viewing angle of the 3D image had been proposed in Japanese Laid Open Publication No. 2002-185983. However, the black stripes BS of the patterned retarder 2 used to widen the vertical viewing angle cause side effects resulting in a large reduction in a luminance of a 2D image."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventor's summary information for this patent: "Embodiments of the invention provide an image display device capable of widening a vertical viewing angle of a 3D image without a reduction in a luminance of a 2D image.

"In one aspect, there is an image display device including a display panel configured to selectively display a 2D image and a 3D image, the display panel including a plurality of subpixels, a patterned retarder configured to divide light from the display panel into first polarized light and second polarized light, and a control voltage generator configured to generate a first DC control voltage of an OFF-level and a second DC control voltage of a slight-on level, which is higher than the OFF-level and is lower than a full-on level, and selectively output the first DC control voltage and the second DC control voltage depending on a driving mode, wherein each of the plurality of subpixels includes a main display unit including a first pixel electrode connected to a data line through a first switch and a first common electrode which is opposite to the first pixel electrode and is connected to a common line, and an auxiliary display unit including a second pixel electrode connected to the data line through a second switch, a second common electrode which is opposite to the second pixel electrode and is connected to the common line, and a discharge control switch which selectively connects the second pixel electrode to the common line depending on the driving mode, wherein the discharge control switch is turned off by the first DC control voltage in a 2D mode for implementing the 2D image and is slightly turned on by the second DC control voltage in a 3D mode for implementing the 3D image."

URL and more information on this patent, see: Hwang, Kwangjo. Image Display Device Capable of Switching 2D Mode and 3D Mode. U.S. Patent Number 8810569, filed December 22, 2011, and published online on August 19, 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=8810569.PN.&OS=PN/8810569RS=PN/8810569

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

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Source: Journal of Engineering


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