News Column

Patent Issued for Pixel Structure, Touch Display Panel and Liquid Crystal Display

July 22, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Lu, Ying-Chi (Taoyuan County, TW); Chai, Chih-Yun (Taoyuan County, TW); Li, Ming-Chun (Taichung, TW); Huang, Hong-Ji (Hsinchu, TW); Lee, Seok-Lyul (Hsinchu, TW), filed on March 10, 2010, was published online on July 8, 2014.

The assignee for this patent, patent number 8773481, is AU Optronics Corporation (Hsinchu, TW).

Reporters obtained the following quote from the background information supplied by the inventors: "The present invention generally relates to a pixel structure, a touch display panel and a liquid crystal display, in particular, to a fringe field switching pixel structure, a touch display panel and a liquid crystal display.

"Recently, with the optoelectronic technology and the technology of manufacturing semiconductor maturing, the development of the flat panel display is vigorous promoted. The liquid crystal display gradually replaces the conventional cathode ray tube display based on the advantages of low operation voltage, non-radiation, light weight and small volume, and thus becomes the main stream of the recent display products. However, the liquid crystal display still has a problem of restricted viewing angle. At present, the technology for achieving wide viewing angle display effect includes a twisted nematic (TN) liquid crystal combined with a wide viewing film, an in-plane switching (IPS) liquid crystal display, a fringe field switching (FFS) liquid crystal display and a multi-domain vertically alignment (MVA) liquid crystal display. Herein, the conventional fringe field switching liquid crystal display is discussed.

"The schematic top view diagram and the schematic cross-sectional diagram of a pixel structure according to a conventional fringe field switching liquid crystal display are shown in FIG. 1A and FIG. 1B. Referring to FIGS. 1A and 1B, a pixel structure 100 disposed on a substrate 10 includes at least a scan line 102, at least a data line 104, an active device 106, a first electrode 108 and a second electrode 110. The scan line 102 and the data line 104 demarcate a rectangular pixel region P. The first electrode 108 and the second electrode 110 are located in the rectangular pixel region P and the second electrode 110 is electrically connected to the active device 106. In addition, the second electrode 110 is disposed between the first electrode 108 and the substrate 10. The first electrode 108 has a plurality of slits 108A so as to expose a portion of the second electrode 110, that is to say, a portion of the conductive pattern of the first electrode 108 is not overlapped with the second electrode 110 at where the plurality of slits 108A is located.

"It is noted that the first electrode 108 is not electrically connected to the active device 106, but electrically connected to a common voltage source (not shown). When the pixel structure 100 displays, the first electrode 108 and the second electrode 110 are applied by different voltages so as to generate a fringe field effect and render the liquid crystal display represent the wide viewing angle display effect.

"The pixel structure 100 is apt to improve the display effect of liquid crystal display. However, certain undesirable effect may occur when the liquid crystal display having the pixel structure 100 attached with a touch panel to form a touch display panel. For example, the liquid crystal molecules of the liquid crystal display may be disturbed and thus disorderly arrange when a user press the above-mentioned touch display panel. Accordingly, the phenomenon of uneven brightness may occur at the place surrounding the touch point and the judgments of the touch input or the writing input of the touch panel may be harmfully influenced. In the meantime, the slits 108A of the pixel structure 100 are capable of having an influence on the restore time of the disturbed liquid crystal molecules. In particular, the longer the length of the slits 108A is the prolonging the restore time of the disturbed liquid crystal molecules is."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "Accordingly, the present invention is directed to a pixel structure for shortening the restore time of the disturbed liquid crystal molecules of a fringe field switching pixel structure.

"The present invention is further directed to a touch display panel for improving the restore efficiency of the liquid crystal molecules after the touch display panel is pressed.

"The present invention is again directed to a liquid crystal display having good quality.

"The present invention is directed to a pixel structure disposed on a substrate.

"The pixel structure includes a scan line, a data line, an active device, a first electrode and a second electrode. The data line is intersected with the scan line so as to define a rectangular pixel region. The active device is electrically connected to the scan line and the data line. The first electrode has a plurality of stripe patterns and a plurality of connecting patterns located in the rectangular pixel region. Each of the connecting patterns connects two adjacent stripe patterns at a center part or parts near the center part of the respective stripe patterns to demarcate a plurality of slits. An extending direction of the silts intersects with a rectangle length of the rectangular pixel region at an angle .theta. and .theta. complies with 0.degree..ltoreq..theta.

"The present invention is additionally directed to touch display panel including a substrate, an opposite substrate, a light-valve layer, an active device, a first electrode, a second electrode, a touch device layer and an opposite electrode. The substrate has a rectangular pixel region having a rectangle length and a rectangle width, wherein a length of the rectangle length is L and a length of the rectangle width is W, and W
"The present invention is further directed to a pixel structure disposed on a rectangular pixel region of a substrate. The rectangular pixel region defines a long axis direction and a short axis direction. The pixel structure includes an upper transparent electrode and a bottom transparent electrode. The upper transparent electrode is located in the rectangular pixel region and has a first slit and a second slit. The first slit is intersected clockwise with the long axis direction at a first angle .theta.1 while 0.degree..ltoreq..theta.1

"The present invention is further directed to a liquid crystal display including a substrate, an opposite substrate, a liquid crystal layer, and one of the above-mentioned pixel structures. The liquid crystal layer is located between the substrate and the opposite substrate and the pixel structure is disposed on the substrate.

"The present invention adopts the design of connecting patterns so that at least a part of the slits of the fringe field switching pixel structure is shortened. Accordingly, the disorder arrangement of the liquid crystal molecules caused by a user's pressing can be restored rapidly when the fringe field switching pixel structure applied to a touch display panel. In another word, the present invention provides not only a pixel structure having wide viewing angle display effect and the liquid crystal display having the same, but also a pixel structure design with the liquid crystal molecules having good restore efficiency."

For more information, see this patent: Lu, Ying-Chi; Chai, Chih-Yun; Li, Ming-Chun; Huang, Hong-Ji; Lee, Seok-Lyul. Pixel Structure, Touch Display Panel and Liquid Crystal Display. U.S. Patent Number 8773481, filed March 10, 2010, and published online on July 8, 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=8773481.PN.&OS=PN/8773481RS=PN/8773481

Keywords for this news article include: Technology, AU Optronics Corporation.

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Source: Journal of Technology


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