US-20260124914-A1 - DISPLAY DEVICE

Abstract

A display device includes a front plate including a display region that is translucent and a peripheral region that is different from the display region, and a display panel provided opposite at least the display region of the front plate. The front plate includes a plurality of alignment marks provided in the peripheral region at positions corresponding to a plurality of display-panel-side alignment marks provided on the display panel, and a plurality of first marks each having a linear shape and extending along an outer periphery of the display panel.

Inventors

• Mitsunori Yamamoto

Assignees

• JAPAN DISPLAY INC.

Dates

Publication Date

20260507

Application Date

20251230

Priority Date

20200714

Claims (5)

1. 1 . A display device comprising: a front plate including a display region having a light-transmitting property and a peripheral region disposed around an outer periphery of the display region; a display panel provided opposite at least the display region of the front plate; and a backlight, wherein the front plate includes a plurality of alignment marks provided in the peripheral region at positions corresponding to a plurality of display-panel-side alignment marks provided on the display panel, a plurality of first marks each having a linear shape and extending along a first direction substantially parallel to the outer periphery of the display panel, a plurality of sub-marks disposed along the first direction and adjacent to the first marks in a second direction crossing the first direction, the sub-marks including a first sub-mark and a second sub-mark, and a second mark provided between an extending area of a corresponding one of the first marks in the first direction and an outer periphery of the front plate, and the front plate and the display panel are positioned such that: the second sub-mark overlaps with the display panel in a plan view; and the first sub-mark is exposed from the display panel in the plan view, and the backlight and the front plate are positioned such that at least a part of the second mark is exposed to the backlight in the plan view.
2. 2 . The display device according to claim 1 , wherein the alignment marks and the first marks are each provided at a corresponding corner of the display panel.
3. 3 . The display device according to claim 1 , wherein the alignment marks are each provided at a corresponding corner of the display panel, and the first marks are each provided along a corresponding one of four sides of the display panel.
4. 4 . The display device according to claim 1 , wherein the front plate includes a curved surface part, a plurality of the display regions are arrayed on the front plate, and a plurality of the display panels are provided in correspondence with the display regions and curved along and bonded to the front plate.
5. 5 . The display device according to claim 1 , wherein a length of the sub-marks along the first direction is smaller than a length of the first marks.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of U.S. patent application Ser. No. 18/094,426 filed on Jan. 9, 2023, which, in turn, is a continuation of International Patent Application No. PCT/JP2021/020558 filed on May 28, 2021 which designates the United States, incorporated herein by reference, and which claims the benefit of priority from Japanese Patent Application No. 2020-120881 filed on Jul. 14, 2020, incorporated herein by reference. BACKGROUND 1. Technical Field The present invention relates to a display device. 2. Description of the Related Art Japanese Patent Application Laid-open Publication No. 2020-8758 discloses a display device in which a display panel and a protection member are bonded to each other. A reference mark for position alignment is formed on each of the display panel and the protection member, and the display panel and the protection member are disposed so that the reference mark of the display panel and the reference mark of the protection member are placed over each other. WO 2016/113908, Japanese Patent Application Laid-open Publication No. 2016-49934, Japanese Patent Application Laid-open Publication No. 2019-174764 (JP-A-2019-174764), and Japanese Patent Application Laid-open Publication No. 2020-1223 (JP-A-2020-1223) each disclose a display device in which a plurality of display panels are bonded to one front plate (also referred to as a protection plate or a protection panel). For such a display device, it is potentially difficult to check the position accuracy (existence of positional error) of a display panel after the front plate and the display panel are bonded to each other. For example, in the display device disclosed in each of JP-A-2019-174764 and JP-A-2020-1223, the front plate and the display panels are curved and the distance between an alignment mark provided on each display panel and an alignment mark provided on the front plate differs with the position and angle of observation with a camera, and thus positional error of the display panel potentially cannot be accurately detected. SUMMARY A display device according to an embodiment of the present disclosure includes a front plate including a display region that is translucent and a peripheral region that is different from the display region, and a display panel provided opposite at least the display region of the front plate. The front plate includes a plurality of alignment marks provided in the peripheral region at positions corresponding to a plurality of display-panel-side alignment marks provided on the display panel, and a plurality of first marks each having a linear shape and extending along an outer periphery of the display panel. A display device according to an embodiment of the present disclosure includes a front plate including a curved surface part, and a plurality of display panels provided on the front plate and bonded along the front plate. The front plate includes a plurality of alignment marks provided at positions corresponding to a plurality of display-panel-side alignment marks provided on the display panel, and a plurality of first marks each having a linear shape and provided along an outer periphery of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic section diagram of a display device according to a first embodiment; FIG. 2 is a schematic plan view of the display device according to the first embodiment; FIG. 3 is a schematic plan view of a front plate according to the first embodiment; FIG. 4 is a plan view schematically illustrating exemplary position alignment of a display panel and the front plate; FIG. 5 is a configuration diagram of a press bonding device according to the first embodiment; FIG. 6 is a configuration diagram for describing operation of the press bonding device; FIG. 7 is a configuration diagram for describing the operation of the press bonding device; FIG. 8 is a configuration diagram for describing the operation of the press bonding device; FIG. 9 is an explanatory diagram for describing an exemplary method of detecting the position accuracy of the display panel bonded to the front plate; FIG. 10 is an explanatory diagram for describing an exemplary method of detecting the position accuracy of a display panel bonded to a front plate according to a comparative example; FIG. 11 is a plan view illustrating part of the display device according to the first embodiment in an enlarged manner; FIG. 12 is a plan view illustrating part of a display device according to a modification of the first embodiment in an enlarged manner; FIG. 13 is a schematic plan view of a front plate according to a second embodiment; FIG. 14 is a plan view illustrating a region A in FIG. 13 in an enlarged manner; and FIG. 15 is a schematic plan view of a display device according to a third embodiment. DETAILED DESCRIPTION Aspects (embodiments) of the present disclosure will be described below in detail with reference to the accompanying dr