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Researchers Submit Patent Application, "Organic Light Emitting Diode Display Device Including Touch Panel", for Approval

July 23, 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 LIM, Kwang-Su (Paju-si, KR); PARK, Joon-Won (Seoul, KR), filed on April 29, 2013, was made available online on July 10, 2014.

The patent's assignee is Lg Display Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to an organic light emitting diode display device having a built-in touch panel, and more particularly, to an organic light emitting diode display device having a built-in touch panel in which a bad connection between a touch panel and an OLED array may be prevented by preventing disconnection of routing lines.

"Recently, organic light emitting diode (OLED) display devices have received attention as next generation display devices. An OLED is a self emitting device in which light is emitted from an organic emission layer due to recombination of electrons and holes, has high brightness and a low driving voltage, and enables fabrication of a super slim device. Requirements for addition of a touch panel to the OLED display device are increasing to transmit information to the OLED display device by touching a portion of the touch panel with a hand or separate input members.

"General touch panels are classified into three types: an Add-On type, an On-Cell type, and an In-Cell type. The Add-On type touch panel is attached to an outer surface of the OLED display device, the On-Cell type touch panel is deposited on the OLED display device, and the In-Cell type touch panel is installed inside the OLED display device.

"Since the In-Cell type touch panel is built in an OLED display device, the thickness of the OLED display device having the built-in In-Cell type touch panel is smaller than that of an OLED display device having a built-in Add-On type or On-Cell type touch panel.

"In general, an OLED display device having a built-in touch panel includes a lower substrate on which an OLED array is formed and an upper substrate on which a touch panel array is formed. The lower and upper substrates are adhered to each other by an adhesive layer to face each other. The touch panel array includes sensor electrodes formed on the upper substrate, and the sensor electrodes are connected to upper pad electrodes via routing lines.

"The upper pad electrode is connected to a lower pad electrode formed on the lower substrate via a conductive metal material. The lower pad electrode is connected to a flexible printed circuit board (FPCB) and thus a driving signal of the FPCB is applied to the sensor electrode through the lower pad electrode, the conductive metal material, and the upper pad electrode.

"Meanwhile, when the routing lines overlap an edge of the adhesive layer in a horizontal direction when the upper substrate is adhered to the lower substrate, cracks are generated in the routing lines due to a step between a region in which the adhesive layer is formed and a region in which the adhesive layer is not formed. Moreover, a general OLED display device having a built-in touch panel requires a space for connecting the upper and lower pad electrodes. Accordingly, a bezel region increases and thus a display region decreases."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Accordingly, the present invention is directed to an organic light emitting diode display device including a touch panel that substantially obviates one or more problems due to limitations and disadvantages of the related art.

"An object of the present invention is to provide an organic light emitting diode (OLED) display device having a built-in touch panel in which pad parts of a touch panel array are connected on a gate in panel (GIP) circuit unit formed on a lower substrate with an OLED array formed thereon and thus, when an upper substrate is adhered to the lower substrate, occurrence of cracks in routing lines may be prevented.

"Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

"To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, an organic light emitting diode display device having a built-in touch panel includes a lower substrate provided thereon with an organic light emitting diode array including a thin film transistor and an organic light emitting diode and an gate in panel (GIP) circuit unit, an upper substrate adhered to the lower substrate by an adhesive layer to face each other and including a touch panel array including first and second sensor electrodes and first routing lines each having a first end connected to the first and second sensor electrodes and a second end connected to a pad part, and a second routing line formed on the GIP circuit unit to be connected to the pad part via a conductive metal material.

"The first routing lines may vertically overlap an edge of the adhesive layer.

"Grooves may be formed at an inner side of the adhesive layer in regions of the edge of the adhesive layer with which the first routing lines overlap.

"The organic light emitting diode includes a first electrode connected to the thin film transistor, an organic emission layer formed on the first electrode, and a second electrode formed on the organic emission layer.

"The second routing line may be formed on the same layer level as the first electrode.

"The second routing line may be formed on the same layer level as the second electrode.

"The touch panel array may include bridge electrodes formed on the upper substrate, an insulating layer formed to cover the bridge electrodes, first sensor electrodes formed on the insulating layer and electrically connected to the bridge electrodes exposed by selectively removing the insulating layer, and second sensor electrodes formed on the insulating layer to cross the first sensor electrodes.

"The pad part and the second routing line may be connected to each other via a conductive metal material.

"The conductive metal material may be an anisotropic conductive paste or an anisotropic conductive film.

"It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

"The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

"FIG. 1 is a sectional view of an organic light emitting diode (OLED) display device having a built-in touch panel, according to an embodiment of the present invention;

"FIGS. 2A and 2B are plan views of an upper substrate on which a touch panel array is formed, according to embodiments of the present invention; and

"FIG. 3 is a sectional view taken along line I-I' of FIG. 2A."

For additional information on this patent application, see: LIM, Kwang-Su; PARK, Joon-Won. Organic Light Emitting Diode Display Device Including Touch Panel. Filed April 29, 2013 and posted July 10, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4985&p=100&f=G&l=50&d=PG01&S1=20140703.PD.&OS=PD/20140703&RS=PD/20140703

Keywords for this news article include: Electronics, Lg Display Co. Ltd., Light-emitting Diode.

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Source: Electronics Newsweekly


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