News Column

Researchers Submit Patent Application, "Liquid Crystal Display", for Approval

August 6, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Yu, Chia-Hua (New Taipei City, TW); Lin, Sung-Chun (Tainan City, TW); Chang, Chung-Lin (Kaohsiung City, TW); Chan, Chien-Ting (Tainan City, TW); Liu, Hsuan-Chen (Kaohsiung City, TW); Tseng, Chun-Chin (Kaohsiung City, TW), filed on April 17, 2013, was made available online on July 24, 2014.

The patent's assignee is HannStar Display Corp.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to a liquid crystal display (LCD) with HannStar Ultra-high Aperture (HUA), and more particularly, to a liquid crystal display having a plurality of common electrodes with separate power supplies.

"Liquid crystal displays have advantages of portability, low power consumption, and low radiation. Therefore, they are widely used in various portable information products, such as notebooks, personal data assistants (PDA), and have replaced CRT monitor in desktop computers gradually.

"The driving theory of the conventional liquid crystal display includes providing common voltages and pixel voltages to the common electrodes and the pixel electrodes on the bottom substrate respectively to form an electric field in the liquid crystal layer for displaying image. In the liquid crystal display, agate electrode may cause kickback voltage Vp to the pixel, and the kickback voltage Vp is influenced by the capacitors between various electric devices of the pixel. The more the kickback voltage Vp, the greater the value of the kickback voltage of the common electrode is. The great value of the kickback voltage influences the voltage level of the common electrode to cause ripple voltage and abnormal images or bad performance, such as cross talk and greenish. Therefore, to decrease the abnormal images or increase performance of liquid crystal display by preventing the influence from kickback voltage is still an important issue for the manufacturer."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "It is one of the objectives of the present invention to solve the problem of the abnormal images or bad performance caused by high kickback voltage in the conventional liquid crystal display. The present invention provides a liquid crystal display having a plurality of separate or independent common electrodes, wherein the abnormal images caused by kickback voltage can be improved by adjusting the common voltage of each separate and independent common electrode.

"In order to solve the above-mentioned problem, the present invention provides a liquid crystal display including a bottom substrate, a plurality of thin film transistors, an overcoat layer, a bottom common electrode, a plurality of pixel electrodes and a liquid crystal layer. Each of the thin film transistor is disposed on the bottom substrate and includes a gate electrode, a source electrode, and a drain electrode. The overcoat layer is disposed above the thin film transistors. The bottom common electrode is disposed on the overcoat layer. The pixel electrode layers are disposed above the bottom common electrode, electrically connected to the drain electrodes respectively. The liquid crystal layer is disposed above pixel electrodes.

"In order to solve the above-mentioned problem, the present invention further provides a liquid crystal display, including a bottom substrate, a plurality of thin film transistors, an overcoat layer, a plurality of bottom sub-common electrodes, a plurality of pixel electrodes, and a liquid crystal layer. Each of the thin film transistor is disposed on the bottom substrate and includes a gate electrode, a source electrode, and a drain electrode. The overcoat layer is disposed above the thin film transistors, the bottom sub-common electrodes are disposed on the overcoat layer. The bottom sub-common electrodes are not electrically connected to each other. The pixel electrodes are disposed above the bottom sub-common electrodes and electrically connected to the drain electrodes respectively. The liquid crystal layer is disposed above the pixel electrodes.

"It is an advantage of the present invention that the liquid crystal display includes separate common electrodes to provide separate voltage supplies, such that the voltage level of each common electrode can be adjusted individually to improve the performance and avoid abnormal images caused by kickback voltages.

"These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a schematic sectional diagram of a single pixel of the liquid crystal display according to a first embodiment of the present invention.

"FIG. 2 is a schematic diagram of the disposition of the common electrode of the liquid crystal display shown in FIG. 1.

"FIG. 3 is a schematic top-view diagram of a portion of the liquid crystal display of a variant of the first embodiment of the present invention.

"FIG. 4 is a schematic diagram of the disposition of the common electrodes of a liquid crystal display according to a second embodiment of the present invention.

"FIG. 5 is a schematic partial top view of the liquid crystal display shown in FIG. 4.

"FIG. 6 is a schematic diagram of the disposition of the common electrode of a liquid crystal display according to a third embodiment of the present invention.

"FIG. 7 is a schematic partial top view of the liquid crystal display shown in FIG. 6.

"FIG. 8 is a schematic sectional diagram of a liquid crystal display according to a fourth embodiment of the present invention.

"FIG. 9 is a schematic diagram of the disposition of the common electrode of the liquid crystal display shown in FIG. 8."

For additional information on this patent application, see: Yu, Chia-Hua; Lin, Sung-Chun; Chang, Chung-Lin; Chan, Chien-Ting; Liu, Hsuan-Chen; Tseng, Chun-Chin. Liquid Crystal Display. Filed April 17, 2013 and posted July 24, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3601&p=73&f=G&l=50&d=PG01&S1=20140717.PD.&OS=PD/20140717&RS=PD/20140717

Keywords for this news article include: Electronics.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Electronics Newsweekly


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters