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Researchers Submit Patent Application, "Array Substrate, Preparation and Driving Method Thereof, Liquid Crystal Display Panel and Display Device",...

June 19, 2014



Researchers Submit Patent Application, "Array Substrate, Preparation and Driving Method Thereof, Liquid Crystal Display Panel and Display Device", for Approval

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 HAO, Guangye (Beijing, CN); Ye, Teng (Beijing, CN); Zhao, Lijun (Beijing, CN); Im, Yunsik (Beijing, CN), filed on November 27, 2013, was made available online on June 5, 2014.

No assignee for this patent application has been made.

News editors obtained the following quote from the background information supplied by the inventors: "Thin Film Transistor Liquid Crystal Displays (TFT-LCDs) occupy a major share in the market of display device due to low cost, high yield and good display effect. Among them, in-plane switching (IPS) mode liquid crystal di-play devices have become one of the main-stream liquid crystal display devices at present due to wide viewing angle.

"An existing IPS mode liquid crystal display device comprises a liquid crystal display panel, which comprises an array substrate and a color film substrate; liquid crystal molecules are filled between the array substrate and the color film substrate, the array substrate comprises data lines and gate lines intersecting transversely and longitudinally to form a plurality of pixel units; each pixel unit comprises a pixel electrode and common electrodes, the pixel electrode and the common electrodes are parallel to each other and generate a planar electric field; the crystal liquid molecules can be driven to rotate through the planar electric field generated between the pixel electrode and the common electrodes in each pixel unit to display an image. In spite of the wide viewing angle and good display effect, the IPS mode liquid crystal display device with the above structure also has the disadvantages of high required drive voltage and low light transmission rate (resulting from marginal electric field effect)."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Embodiments of the present invention provide an array substrate and preparation and driving methods thereof, a liquid crystal display panel and a display device, for reducing the drive voltage required by the existing IPS mode liquid crystal display device, and increasing the light transmission rate.

"An embodiment of the present invention provides an array substrate, which comprises data lines and gate lines intersecting transversely and longitudinally to form a plurality of pixel units, each pixel unit comprising a pixel electrode and common electrodes, wherein,

"the common electrodes include first common electrodes and second common electrodes, the first common electrodes, the second common electrodes and the pixel electrode are located in a same layer and do not overlap with each other, the first common electrodes and the second common electrodes are in strip patterns, and the first common electrodes, the pixel electrode and the second common electrodes are spaced apart from each other.

"An embodiment of the present invention also provides a preparation method of an array substrate, the array substrate comprises data lines and gate lines intersecting transversely and longitudinally to define a plurality of pixel units, each pixel unit comprising a pixel electrode and common electrodes, wherein the common electrodes include first common electrodes and second common electrodes; the first common electrodes, the second common electrodes and the pixel electrode are located in a same layer and do not overlap with each other; the first common electrodes and the second common electrodes are in strip patterns; the first common electrodes, the pixel electrode and the second common electrodes are spaced apart from each other, and the array substrate further comprises a first common electrode wire and a second common electrode wire, and the first common electrode wire and the second common electrode wire are parallel to the gate lines; and

"the method comprises:

"A. depositing a gate metal film on a glass substrate, etching the gate metal film to form a pattern including the gate lines, the first common electrode wire and the second common electrode wire through a patterning process;

"B. forming a gate insulation layer, an active layer and a doped layer on the glass substrate subjected to the processing in the step A, and etching to form a pattern of a silicon island through a patterning process;

"C. depositing a source-drain metal layer on the glass substrate subjected to the processing in the step B, and etching the doped layer and the source-drain metal layer to form a pattern including a source-drain metal electrode and the data lines through a patterning process;

"D. depositing a passivation layer on the glass substrate subjected to the processing in the step C, and etching to form a pattern of first contact vias, a pattern of second contact vias and a pattern of a third contact via, respectively, through a patterning process; and

"E. forming a transparent metal layer on the glass substrate subjected to the processing in the step D, and etching to form a pattern including the pixel electrode, the first common electrodes and the second common electrodes through a patterning process, connecting the pixel electrode to the source-drain metal electrode through the third contact via, connecting the first common electrodes to the first common electrode wire through the first contact via, and connecting the second common electrodes to the second common electrode wire through the second contact vias.

"An embodiment of the present invention also provides a liquid crystal display panel, comprising a color film substrate and the above array substrate which are aligned to form a cell with liquid crystals filled therebetween.

"An embodiment of the present invention also provides a liquid crystal display device comprising the above liquid crystal display panel.

"An embodiment of the present invention also provides a driving method of the above array substrate, comprising.

"supplying a first voltage to the first common electrodes;

"supplying a second voltage to the pixel electrode, and the voltage difference between the first voltage and the second voltage being a first preset value: and

"supplying a third voltage to the second common electrodes, the voltage difference between the first voltage and the third voltage being a second preset value, and the voltage difference between the second voltage and the third voltage being a third preset value.

"Other features and advantages of the present invention will be discussed in the subsequent description, and partially become obvious from the description or are understood through implementing the present invention. Objectives and other advantages of the present invention can be achieved or obtained through the structure specifically set forth in the written description, claims and accompanying drawings.

BRIEF DESCRIPTION OF THE BRA WINGS

"The drawings described herein are intended for further understanding of the invention and form part of the present invention, and the exemplary embodiments of the invention and description thereof are used for illustrating the present invention instead of improperly limiting the present invention. In the drawings:

"FIG. 1 is a structural schematic diagram of an array substrate in an embodiment of the present invention;

"FIG. 2 is a structural schematic diagram of a transverse section at AA' in FIG. 1;

"FIG. 3 is a schematic diagram of positions and voltage distribution of a pixel electrode and common electrodes in an embodiment of the present invention;

"FIG. 4 is a flow chart of implementing a preparation method of an array substrate in an embodiment of the present invention;

"FIGS. 5a-5e are schematic diagrams illustrating process flow of a preparation method of an array substrate in an embodiment of the present invention;

"FIG. 6a is a schematic diagram of liquid crystal director and light transmission rate simulations of an IPS mode liquid crystal display device in the prior art; and

"FIG. 6b is a schematic diagram of liquid crystal director and light transmission rate simulations of a liquid crystal display device in an embodiment of the present invention."

For additional information on this patent application, see: HAO, Guangye; Ye, Teng; Zhao, Lijun; Im, Yunsik. Array Substrate, Preparation and Driving Method Thereof, Liquid Crystal Display Panel and Display Device. Filed November 27, 2013 and posted June 5, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3889&p=78&f=G&l=50&d=PG01&S1=20140529.PD.&OS=PD/20140529&RS=PD/20140529

Keywords for this news article include: Patents.

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Source: Politics & Government Week


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