US-20260126866-A1 - DISPLAY DEVICE

US20260126866A1US 20260126866 A1US20260126866 A1US 20260126866A1US-20260126866-A1

Abstract

According to one embodiment, a lateral-electric-field liquid crystal display device includes a light-emitting display layer including OLEDs and a driving circuit controlling light emission of the OLEDs, a moisture impermeable film provided to be laminated on the light-emitting display layer to prevent infiltration of moisture into the light-emitting display layer, an optical substrate provided separately from the moisture impermeable film and subjecting light from the light-emitting display region to optical processing, a first touch electrode group serving as one electrode group of touch electrodes and provided on a back surface of the optical substrate, and an extraction electrode group formed to be laminated on the moisture impermeable film, the extraction electrode group and the optical substrate have an overlapping part in plan view, and electrodes of the first touch electrode group being electrically connected to electrodes of the extraction electrode group in the overlapping part.

Inventors

Yoshiro Aoki
Takashi Nakamura
Masahiro Tada
Hirotaka Hayashi
Makoto Shibusawa
Yutaka Umeda
Miyuki Ishikawa

Assignees

MAGNOLIA WHITE CORPORATION

Dates

Publication Date: 20260507
Application Date: 20251231
Priority Date: 20131004

Claims (20)

1 - 18 . (canceled)
19 . A display device comprising: a first substrate including: a light-emitting display region, and a peripheral region surrounding the light-emitting display region in a plan view; light-emitting elements located in the light-emitting display region on the first substrate; a sealing layer located on the light-emitting elements in the light-emitting display region and in the peripheral region on the first substrate; a seal material located in the peripheral region and surrounding the light-emitting display region in the plan view; a filler covering the sealing layer; touch electrodes located above the filler and overlapping the light-emitting display region; an electrode electrically connected to one of the touch electrodes and located in the peripheral region; and a flexible print circuit electrically connected to the electrode; wherein the filler extends to the seal material, each of the touch electrodes includes a plurality of apertures, the seal material includes an organic material, the sealing layer includes an opening part in the peripheral region on the first substrate, a second thickness of the sealing layer at the opening part is smaller than a first thickness of the sealing layer at the light-emitting display region, and the electrode is electrically connected to the one of the touch electrodes at the opening part.
20 . The display device according to claim 19 , wherein the first substrate, the sealing layer, and the filler are stacked in a third direction, the sealing layer includes: a lower surface extending parallel to the first substrate, and an upper surface opposing the lower surface and being farther from the first substrate compared to the lower surface in the third direction; and the electrode is closer to the first substrate in the third direction compared to the upper surface of the sealing layer at the light-emitting display region.
21 . The display device according to claim 20 , wherein the third direction is parallel to a thickness direction of the sealing layer.
22 . The display device according to claim 19 , wherein the filler is located inside the seal material in the plan view.
23 . The display device according to claim 22 , wherein the first substrate, the sealing layer, and the filler are stacked in a third direction, and at least a part of the seal material does not overlap the filler in the third direction.
24 . The display device according to claim 19 , further comprising: an optical substrate overlapping the light-emitting display region, wherein the touch electrodes are located between the filler and the optical substrate.
25 . The display device according to claim 19 , wherein the first substrate, the sealing layer, and the filler are stacked in a third direction, the electrode is electrically connected to the one of the touch electrodes at the opening part via a conductive member, the conductive member is located between a part of the seal material and another part of the seal material in a first direction crossing the third direction, and the part of the seal material and the another part of the seal material are in direct contact with the conductive member.
26 . The display device according to claim 25 , wherein the light-emitting display region and the flexible print circuit are arranged in the first direction.
27 . The display device according to claim 19 , wherein the first substrate, the sealing layer, and the filler are stacked in a third direction, and the filler is located between the sealing layer and the touch electrodes in the third direction.
28 . The display device according to claim 27 , wherein the seal material is located between the sealing layer and the touch electrodes in the third direction.
29 . A display device comprising: a first substrate including: a light-emitting display region, and a peripheral region surrounding the light-emitting display region in a plan view; light-emitting elements located in the light-emitting display region on the first substrate; a sealing layer located on the light-emitting elements in the light-emitting display region and in the peripheral region on the first substrate; a seal material located in the peripheral region and surrounding the light-emitting display region in the plan view; a filler covering the sealing layer; a touch electrode layer located above the filler, overlapping the light-emitting display region, and including a plurality of touch electrodes; an electrode electrically connected to the touch electrode layer and located in the peripheral region; and a flexible print circuit electrically connected to the electrode; wherein the filler extends to the seal material, each of the plurality of touch electrodes includes a plurality of apertures, the seal material includes an organic material, the sealing layer includes an opening part in the peripheral region on the first substrate, a second thickness of the sealing layer at the opening part is smaller than a first thickness of the sealing layer at the light-emitting display region, and the electrode is electrically connected to the touch electrode layer at the opening part.
30 . The display device according to claim 29 , wherein the first substrate, the sealing layer, and the filler are stacked in a third direction, the sealing layer includes: a lower surface extending parallel to the first substrate, and an upper surface opposing the lower surface and being farther from the first substrate compared to the lower surface in the third direction; and the electrode is closer to the first substrate in the third direction compared to the upper surface of the sealing layer at the light-emitting display region.
31 . The display device according to claim 29 , wherein the first substrate, the sealing layer, and the filler are stacked in a third direction, and at least a part of the seal material does not overlap the filler in the third direction.
32 . The display device according to claim 29 , further comprising: an optical substrate overlapping the light-emitting display region, wherein the touch electrode layer is located between the filler and the optical substrate.
33 . The display device according to claim 29 , wherein the electrode is electrically connected to the touch electrode layer at the opening part via a conductive member.
34 . The display device according to claim 29 , wherein the first substrate, the sealing layer, and the filler are stacked in a third direction, the electrode is electrically connected to the one of the touch electrodes at the opening part via a conductive member, the conductive member is located between a part of the seal material and another part of the seal material in a first direction crossing the third direction, and the part of the seal material and the another part of the seal material are in direct contact with the conductive member.
35 . The display device according to claim 34 , wherein the light-emitting display region and the flexible print circuit are arranged in the first direction.
36 . The display device according to claim 29 , wherein the touch electrode layer overlaps the seal material in the plan view.
37 . The display device according to claim 29 , wherein the first substrate, the sealing layer, and the filler are stacked in a third direction, and the seal material is located between the sealing layer and the touch electrode layer in the third direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. application Ser. No. 18/314,328, filed May 9, 2023, which is a continuation of U.S. application Ser. No. 17/863,802, filed Jul. 13, 2022 (now U.S. Pat. No. 11,687,186), which is a continuation of U.S. application Ser. No. 16/911,970, filed Jun. 25, 2020 (now U.S. Pat. No. 11,422,651), which is a continuation of U.S. application Ser. No. 16/392,167, filed Apr. 23, 2019 (now U.S. Pat. No. 10,732,751), which is a continuation of U.S. application Ser. No. 16/128,018, filed Sep. 11, 2018 (now U.S. Pat. No. 10,318,036), which is a continuation of U.S. application Ser. No. 15/889,915, filed Feb. 6, 2018 (now U.S. Pat. No. 10,101,839), which is a continuation of U.S. application Ser. No. 15/379,309, filed Dec. 14, 2016 (now U.S. Pat. No. 9,921,676), which is a continuation of U.S. application Ser. No. 15/180,704, filed Jun. 13, 2016 (now U.S. Pat. No. 9,547,403), which is a continuation of U.S. application Ser. No. 14/995,972, filed on Jan. 14, 2016 (now U.S. Pat. No. 9,383,880), which is a continuation of U.S. application Ser. No. 14/505,880 filed Oct. 3, 2014, now U.S. Pat. No. 9,262,030 and is based upon and claims the benefit of priority from Japanese Patent Application No. 2013-209238, filed Oct. 4, 2013, the entire contents of all of which are incorporated herein by reference. FIELD Embodiments described herein relate generally to a display device. BACKGROUND Electronic apparatuses such as mobile phones, personal digital assistants, and personal computers have been developed. Such electronic apparatuses are equipped with a display device including a touch panel function as a form of user interface. These electronic apparatuses usually include a capacitive touch panel function. In a capacitive touch panel, conductive electrodes are disposed on the panel, and a contact position of a finger or a pen on the surface of the panel is sensed based on change in capacity between the electrode and the finger or the like. An electronic apparatus having the above touch panel function is known as having a structure in which a touch panel board is separately bonded to a display device such as a liquid crystal display device and an organic EL display device, to add a touch panel function. In the meantime, in electronic apparatuses using a liquid crystal device (LCD), an in-cell structure is being generalized. In the in-cell structure, a touch panel function is formed inside the LCD device. Adopting the in-cell structure produces the merit that the thickness and the weight of the devices are reduced, because it becomes unnecessary to use a dedicated touch panel. On the other hand, in OLED display devices using organic light emitting diodes (OLED), it is difficult to provide a touch panel function inside in the same form as LCD devices, because a cathode provided on the whole light-emitting display surface thereof serves as an electromagnetic shield. BRIEF DESCRIPTION OF THE DRAWING A general architecture that implements the various features of the embodiments will now be described with reference to the drawings. The drawings and the associated descriptions are provided to illustrate the embodiments and not to limit the scope of the invention. FIG. 1 is a cross-sectional view illustrating a structure of a display device discussed prior to the invention. FIG. 2 is a schematic diagram illustrating a structure of a touch panel. FIG. 3 is a cross-sectional view illustrating a structure of a display device according to a first embodiment. FIG. 4A is a diagram for explaining a method for forming a moisture impermeable film in the display device according to the first embodiment. FIG. 4B is a diagram for explaining a method for forming a moisture impermeable film in the display device according to the first embodiment. FIG. 5A is a diagram for explaining a method for forming an extraction terminal in the display device according to the first embodiment. FIG. 5B is a diagram for explaining a method for forming an extraction terminal in the display device according to the first embodiment. FIG. 6 is a diagram illustrating arrangement of connection pads in the display device according to the first embodiment. FIG. 7A is a diagram illustrating a method for peeling the moisture impermeable film and a method for exposing and extracting a driving terminal in the display device according to the first embodiment. FIG. 7B is a diagram illustrating a method for peeling the moisture impermeable film and a method for exposing and extracting a driving terminal in the display device according to the first embodiment. FIG. 8 is a diagram for explaining a method for connecting the display device according to the first embodiment to an external driving circuit. FIG. 9 is a diagram illustrating a structure of touch electrodes in a display device according to a second embodiment. FIG. 10 is a diagram illustrating a structure of touch electrodes in a display device accordi