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Patent Issued for Touch Panel (USPTO 9419612)

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08/25/2016 | 11:57pm CEST

By a News Reporter-Staff News Editor at Journal of Engineering -- WINTEK CORPORATION (Taichung, TW) has been issued patent number 9419612, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Fang, Chong-Yang (Taichung, TW); Wang, Wen-Chun (Taichung, TW).

This patent was filed on September 14, 2014 and was published online on August 16, 2016.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The invention relates to a touch panel; more particularly, the invention relates to a touch panel with mesh electrodes.

"In recent years, as information technology, wireless mobile communication, and info nation appliances have been rapidly developed and applied, various information products have utilized touch panels as input devices in replacement of conventional input devices, e.g., keyboards or mice, so as to satisfy the requirements for convenience, compactness, and the user-friendly design of the information products. Based on different sensing types, touch panels can be generally categorized into resistive touch panels, capacitive touch panels, optical touch panels, acoustic-wave touch panels, and electromagnetic touch panels. Compared to other types of touch panels, the capacitive touch panels characterized by short response time, satisfactory reliability, and high definition have been extensively applied to various hand-held electronic devices.

"According to the existing touch sensing techniques, a transparent electrode may be made of a transparent conductive material (e.g., indium tin oxide, ITO); moreover, a mesh electrode may be made of a metal conductive material. In general, the mesh electrodes in a touch panel have specific shape and periods, e.g., hexagonal mesh patterns or rectangular mesh patterns with uniform size. When said touch panel is applied to a display device, the mesh electrodes in the touch panel and the pixel structure with the specific period in the display device are overlapped, such that pale and dark lines are generated, i.e., the display device may encounter the issue of moire. The pale and dark lines are apt to be perceived by users of the display device, thus posing a negative impact on the visual effects of the display device.

"At present, some techniques may be applied to resolve the issue of moire occurring in the touch panel having the mesh electrodes, such as adjustment of the period of the mesh electrodes or rotation of the mesh electrodes with respect to the pixel structure of the display device. However, said techniques need be modified for individual display devices with different pixel dimensions, and the modification does not necessarily guarantee the reduction of moire."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The invention is directed to a touch panel capable of reducing moire.

"In an embodiment of the invention, a touch panel that a first substrate and a plurality of conductive electrodes is provided. The conductive electrodes are located at the first substrate, and each of the conductive electrodes includes at least one of mesh electrodes. Each of the mesh electrodes includes a plurality of conductive patterns, and the conductive patterns of the same mesh electrode are connected together. Each of the conductive patterns has a central point, and distances from the central point of each of the conductive patterns to the central points of other adjacent conductive patterns are incongruent, such that the conductive patterns are arranged in an irregular manner.

"According to an embodiment of the invention, the conductive electrodes further include a plurality of first conductive electrodes and a plurality of second conductive electrodes. The first conductive electrodes are located on one side of the first substrate, and each of the first conductive electrodes includes the mesh electrodes arranged along a first direction and connected together. The second conductive electrodes are located on one side of the first substrate, and each of the second conductive electrodes includes the mesh electrodes arranged along a second direction and connected together. Here, the mesh electrodes of the first conductive electrodes are electrically insulated from the mesh electrodes of the second conductive electrodes.

"According to an embodiment of the invention, each of the conductive patterns is a circular ring or an arc-shaped line segment.

"According to an embodiment of the invention, the conductive patterns are overlapped or tangent to each other or one another.

"According to an embodiment of the invention, a radius of each of the conductive patterns and radii of other adjacent conductive patterns are equal.

"According to an embodiment of the invention, a radius of each of the conductive patterns is different from at least one of radii of other adjacent conductive patterns.

"According to an embodiment of the invention, the mesh electrodes of each of the first conductive electrodes are electrically insulated from the adjacent mesh electrodes of the second conductive electrodes through the conductive patterns therebetween are cut off.

"According to an embodiment of the invention, the mesh electrodes of each of the first conductive electrodes are electrically insulated from the adjacent mesh electrodes of the second conductive electrodes through the orthogonal projections of the conductive patterns therebetween on the first substrate are not overlapped.

"According to an embodiment of the invention, the first conductive electrodes and the second conductive electrodes are located on the same side of the first substrate.

"According to an embodiment of the invention, the first conductive electrodes and the second conductive electrodes are located on the same surface of the first substrate, and the first conductive electrodes are electrically insulated from the second conductive electrodes.

"According to an embodiment of the invention, the touch panel further includes an insulation pattern. The mesh electrodes arranged in the same direction are electrically insulated, and a connection line between any two adjacent mesh electrodes of the mesh electrodes connects two adjacent mesh electrodes along the same direction. The insulation pattern is located between the first conductive electrodes and second conductive electrodes, and the connection line is located on the insulation pattern and connected to the mesh electrodes arranged in the same direction.

"According to an embodiment of the invention, the connection line is a linear connection line or a chain-shaped connection line constituted by a plurality of conductive patterns connected together.

"According to an embodiment of the invention, the touch panel further includes an insulation layer that is located between the first conductive electrodes and the second conductive electrodes.

"According to an embodiment of the invention, an orthogonal projection of each of the mesh electrodes of each of the first conductive electrodes on the first substrate and an orthogonal projection of the adjacent one of the mesh electrodes of one of the second conductive electrodes on the first substrate has an overlapping portion, and each of the conductive patterns adjacent to the overlapping portion is an arc-shaped line segment.

"According to an embodiment of the invention, the mesh electrodes corresponding to the overlapping portion further include a plurality of dummy line segments located on one side of the conductive patterns corresponding to the overlapping portion, and the dummy line segments and the conductive patterns correspondingly constitute a plurality of circular rings.

"According to an embodiment of the invention, the first conductive electrodes and the second conductive electrodes are located on two respective sides of the first substrate.

"According to an embodiment of the invention, the touch panel further includes a second substrate and an adhesive layer. The second substrate is located on one side of the first substrate, and the first conductive electrodes and the second conductive electrodes are located on two respective surfaces of the first substrate. The adhesive layer is located between the first substrate and the second substrate.

"According to an embodiment of the invention, the touch panel further includes a second substrate and an adhesive layer. The second substrate is located on one side of the first substrate. Here, the first conductive electrodes are located on one surface of the first substrate; the second conductive electrodes are located on one surface of the second substrate facing the other surface of the first substrate where the first conductive electrodes are not located. The adhesive layer is located between the first substrate and the second substrate.

"According to an embodiment of the invention, the touch panel further includes a third substrate and an adhesive layer. The third substrate is located on one side of the second substrate opposite to the first substrate. The adhesive layer is located between the third substrate and the second substrate.

"According to an embodiment of the invention, the touch panel further includes a third substrate and an adhesive layer. The third substrate is located on one side of the first substrate opposite to the second substrate. The adhesive layer is located between the third substrate and the first substrate.

"According to an embodiment of the invention, a material of the conductive patterns includes conductive metal, conductive ink, carbon nano-tubes, grapheme, metal nano-particles, metal nano-wires, or a combination thereof.

"According to an embodiment of the invention, a wire width of each of the conductive patterns is within a range from 0.5 micrometers (.mu.m) to 20 micrometers (.mu.m).

"According to an embodiment of the invention, the first substrate is a substrate of a display.

"In view of the above, the conductive electrodes of the touch panel described herein are constituted by the mesh electrodes connected together. Each of the mesh electrodes includes a plurality of conductive patterns, each of the conductive patterns has a central point, and the distances from the central point of each of the conductive patterns to the central points of other adjacent conductive patterns are incongruent, such that the conductive patterns are arranged in an irregular manner. When the touch panel described herein is applied to a display device, the pale and dark lines occur by the irregularly arranged conductive patterns of the touch panel overlapping with the pixel structure having the specific period in the display device would be decreased, so as to prevent the effect of moire occurred in the display device. Thereby, the touch panel described herein may not be subject to the problem of moire.

"Several exemplary embodiments accompanied with figures are described in detail below to further describe the invention in details."

For the URL and additional information on this patent, see: Fang, Chong-Yang; Wang, Wen-Chun. Touch Panel. U.S. Patent Number 9419612, filed September 14, 2014, and published online on August 16, 2016. 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=9419612.PN.&OS=PN/9419612RS=PN/9419612

Keywords for this news article include: WINTEK CORPORATION.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2016, NewsRx LLC

(c) 2016 NewsRx LLC, source Science Newsletters

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