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Researchers Submit Patent Application, "Display Device with Touch Panel", for Approval

June 12, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor Teramoto, Masahiro (Mobara, JP), filed on January 28, 2014, was made available online on May 29, 2014.

The patent's assignee is Panasonic Liquid Crystal Display Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to a display device with a touch panel, and more particularly, to a display device with a touch panel which includes a capacitance coupling type touch panel.

"Major systems adopted by conventional touch panels include a system of detecting an optical change and a system of detecting a change in electric characteristic. As systems of detecting a change in electric characteristic, a capacitance coupling system is known (see, for example, JP 2008-65748 A and JP 2009-015489 A).

"FIGS. 9 to 11 illustrate a conventional capacitance coupling type touch panel. FIG. 9 is a plan diagram illustrating an electrode pattern, FIG. 10 is a sectional diagram illustrating a sectional structure cut on the line X-X of FIG. 9, and FIG. 11 is a sectional diagram illustrating a sectional structure cut on the line XI-XI of FIG. 9.

"As illustrated in FIGS. 9 to 11, the conventional capacitance coupling type touch panel includes a plurality of electrodes 1X extending in a first direction (e.g., X direction) and being disposed in parallel in a second direction (e.g., Y direction) intersecting the first direction, and a plurality of electrodes 2Y intersecting the electrodes 1X, extending in the second direction, and being disposed in parallel in the first direction. The plurality of electrodes 2Y are disposed on a substrate 11 to be covered with an insulating film 12 formed thereon. The plurality of electrodes 1X are disposed on the insulating film 12 to be covered with a protective film 13 formed thereon. The electrodes 1X and 2Y are made of transparent conductive materials such as indium tin oxides (ITOs).

"In the conventional capacitance coupling type touch panel, as illustrated in FIGS. 9 to 11, the plurality of electrodes 1X and the plurality of electrodes 2Y are formed on different conductive layers (upper and lower layers) via the insulating film 12. In the case of this electrode structure, distortion occurs in the protective film 13 formed on the insulating film 12 and the electrodes 1X of the upper layer because of the electrode 1X of the upper layer, and optical path lengths are different between the upper and lower layers with respect to a reflected light. Thus, a color difference is generated between the upper electrodes 1X and the lower electrodes 2Y, making electrode patterns of the electrodes 1X and 2Y visible. Such visible electrode patterns cause deterioration of optical characteristics and reduction in characteristics of a display device incorporating the touch panel. Thus, countermeasures are necessary."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "It is an object of the present invention to provide a technology capable of suppressing reduction in characteristics of a display device with a touch panel.

"This and other objects and novel features of the present invention become apparent upon reading of the detailed description of the invention in conjunction with the accompanying drawings.

"A typical aspect of the invention disclosed in this application is briefly outlined as follows.

"(1) A display device with a touch panel includes: a display panel; and a capacitance coupling type touch panel disposed on a surface of an observer side of the display panel, in which: the capacitance coupling type touch panel includes on a substrate, a plurality of first electrodes extending in a first direction and being disposed in parallel in a second direction intersecting the first direction, and a plurality of second electrodes intersecting the plurality of first electrodes, extending in the second direction, and being disposed in parallel in the first direction; each of the plurality of first electrodes includes a first portion formed on a layer different from a layer of the plurality of second electrodes to intersect one of the plurality of second electrodes, and a second portion formed on the same layer as the layer of the plurality of second electrodes separately from the plurality of second electrodes; and the first portion is connected to the second portion via a contact hole formed through an insulating film formed between the first portion and the plurality of second electrodes.

"(2) In the display device with the touch panel according to item (1), the first portion of the plurality of first electrodes is formed above the plurality of second electrodes.

"(3) In the display device with the touch panel according to item (1), the first portion of the plurality of first electrodes is formed below the plurality of second electrodes.

"(4) In the display device with the touch panel according to any one of items (1) to (3), each of the plurality of second electrodes includes a portion wider than a portion intersecting the plurality of first electrodes between the plurality of first electrodes; and the each of the plurality of first electrodes includes a portion wider than a portion intersecting the plurality of second electrodes between the plurality of second electrodes.

"(5) In the display device with the touch panel according to any one of items (1) to (4), the plurality of first electrodes and the plurality of second electrodes are made of transparent conductive materials.

"(6) The display device with the touch panel according to any one of items (1) to (5) further includes a protective film formed on the substrate to cover the plurality of first electrodes and the plurality of second electrodes.

"The present invention enables suppression of reduction in characteristics of the display device with the touch panel.

BRIEF DESCRIPTION OF THE DRAWINGS

"In the accompanying drawings:

"FIG. 1 is a plan diagram illustrating electrode patterns of a touch panel incorporated in a display device with a touch panel according to a first embodiment of the present invention;

"FIG. 2 is an enlarged plan diagram of a part of FIG. 1;

"FIG. 3 is a sectional diagram illustrating a sectional structure cut on the line of FIG. 1;

"FIG. 4 is a sectional diagram illustrating a sectional structure cut on the line IV-IV of FIG. 1;

"FIG. 5 is a block diagram illustrating a schematic configuration of the display device with the touch panel according to the first embodiment of the present invention;

"FIG. 6 is a plan diagram illustrating electrode patterns of a touch panel incorporated in a display device with a touch panel according to a second embodiment of the present invention;

"FIG. 7 is a sectional diagram illustrating a sectional structure cut on the line VII-VII of FIG. 6;

"FIG. 8 is a sectional diagram illustrating a sectional structure cut on the line VIII-VIII of FIG. 6;

"FIG. 9 is a plan diagram illustrating electrode patterns of a conventional capacitance coupling type touch panel;

"FIG. 10 is a sectional diagram illustrating a sectional structure cut on the line X-X of FIG. 9; and

"FIG. 11 is a sectional diagram illustrating a sectional structure cut on the line XI-XI of FIG. 9."

For additional information on this patent application, see: Teramoto, Masahiro. Display Device with Touch Panel. Filed January 28, 2014 and posted May 29, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4439&p=89&f=G&l=50&d=PG01&S1=20140522.PD.&OS=PD/20140522&RS=PD/20140522

Keywords for this news article include: Panasonic Liquid Crystal Display Co. Ltd.

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Source: Politics & Government Week


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