News Column

Patent Issued for Color Filter with Touch Screen Function and Liquid Crystal Display Device

February 19, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- A patent by the inventor Kuo, Chien-Chung (Taichung County, TW), filed on February 27, 2009, was published online on February 4, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8643629 is assigned to Wintek Corporation (Taichung, TW).

The following quote was obtained by the news editors from the background information supplied by the inventors: "The invention relates to a color filter with a touch screen function and a liquid crystal display device having the color filter.

"FIG. 1 shows a schematic diagram of a conventional liquid crystal display device 100 with a touch activated control. Referring to FIG. 1, the liquid crystal display device 100 includes a touch panel 102 and a liquid crystal panel 104. The touch panel 102 is attached to the liquid crystal panel 104 by a double-sided adhesive tape 106. However, such assembly may have considerably large empty spaces between the touch panel 102 and the liquid crystal panel 104 to produce light leakage and reduce light transmittance as a result. Hence, in another liquid crystal display device 200 shown in FIG. 2, an entire plane of a touch panel 202 and an entire plane of a liquid crystal panel 204 are bonded with each other by optical cement 206 to avoid light leakage. However, the adhering of the optical cement 206 has inferior reliability and is liable to produce bubbles. Further, the constituting members of above design shown in FIG. 1 or FIG. 2 are too many and thus their assembly is difficult to be miniaturized."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventor's summary information for this patent: "The invention relates to a color filter with a touch screen function and a liquid crystal display device having the color filter that are allowed to overcome the disadvantages of conventional designs.

"According to an embodiment of the invention, a color filter with a touch screen function includes a transparent substrate, a conductive layer, a color filtering layer, and a protection layer. The conductive layer is formed on the transparent substrate for sensing touch signals, and the periphery of the conductive layer is provided with peripheral electrodes. The color filtering layer is formed on the conductive layer and includes multiple red light filtering sections, multiple green light filtering sections, and multiple blue light filtering sections, and a pixel of a liquid crystal display device includes at least one red light filtering section, at least one green light filtering section and at least one blue light filtering section. The protection layer is formed on the color filtering layer.

"According to another embodiment of the invention, a liquid crystal display device with a touch activated control includes a color filter substrate, an active matrix substrate and a liquid crystal layer. The color filter substrate includes a first transparent substrate; a first transflective conductive layer formed on the first transparent substrate for sensing touch signals, the periphery of the first transflective conductive layer being provided with peripheral electrodes; a spacer layer formed on the first transflective conductive layer and comprising multiple first regions, second regions, and third regions that are distinguished from one another according to their respective thicknesses, wherein each first region, each second region and each third region overlap a red pixel portion, a green pixel portion and a blue pixel portion of a pixel, respectively; a second transflective conductive layer formed on the spacer layer; a flattened insulating layer formed on the second transflective conductive layer; and a common electrode formed on the flattened insulating layer. The active matrix substrate includes a second transparent substrate and multiple active devices and multiple pixel electrodes formed on the second transparent substrate. The liquid crystal layer is interposed between the color filter substrate and the active matrix substrate.

"Through the above embodiments, since the first transflective conductive layer of the color filter also serves as a conductive layer for sensing touch signals, the color filter may have both functions of filtering incoming light and exercising a touch activated control. Hence, when the color filter is integrated into the liquid crystal display device, the double-sided adhesive tape or optical cement are no longer needed to avoid light leakage and improve light transmittance and assembling reliability. Further, the constituting members are reduced to facilitate miniaturization and the fabrication processes are also simplified; for example, compared with the conventional design, the two transparent substrates that in contact with each other and respectively belong to a touch panel and a liquid crystal panel are omitted from the above embodiments.

"Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention."

URL and more information on this patent, see: Kuo, Chien-Chung. Color Filter with Touch Screen Function and Liquid Crystal Display Device. U.S. Patent Number 8643629, filed February 27, 2009, and published online on February 4, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=60&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2986&f=G&l=50&co1=AND&d=PTXT&s1=20140204.PD.&OS=ISD/20140204&RS=ISD/20140204

Keywords for this news article include: Wintek Corporation.

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: Journal of Engineering


Story Tools