US-20260126684-A1 - DISPLAY DEVICE

US20260126684A1US 20260126684 A1US20260126684 A1US 20260126684A1US-20260126684-A1

Abstract

A display device includes a first substrate having a display area, a first insulating film placed on top of the first substrate, a first conductive portion that is composed of part of a first conducting film placed on top of the first insulating film, a second insulating film placed on top of the first conducting film, a heating wire that is composed of a second conducting film placed on top of the second insulating film and that overlaps at least part of the first conductive portion, a third insulating film placed on top of the second conducting film, and a second conductive portion that is composed of part of a third conducting film placed on top of the third insulating film and that overlaps at least part of the heating wire. The second and third insulating films are greater in film thickness than the first insulating film.

Inventors

Hiroshi Matsukizono
Kohhei Tanaka
Kaoru Yamamoto

Assignees

Sharp Display Technology Corporation

Dates

Publication Date: 20260507
Application Date: 20251105
Priority Date: 20241107

Claims (8)

1 . A display device comprising: a first substrate having a display area where an image is displayed; a first insulating film placed on top of the first substrate; a first conductive portion that is composed of part of a first conducting film placed on top of the first insulating film and that is placed in the display area; a second insulating film placed on top of the first conducting film; a heating wire that is composed of a second conducting film placed on top of the second insulating film and that overlaps at least part of the first conductive portion in the display area; a third insulating film placed on top of the second conducting film; and a second conductive portion that is composed of part of a third conducting film placed on top of the third insulating film and that overlaps at least part of the heating wire in the display area, wherein the second insulating film and the third insulating film are greater in film thickness than the first insulating film.
2 . The display device according to claim 1 , wherein the first conductive portion serves as a source wire that transmits an image signal, and the heating wire extends in parallel with the source wire and is disposed to overlap the source wire via the second insulating film.
3 . The display device according to claim 2 , further comprising: a fourth insulating film placed on top of the third conducting film; a pixel electrode that is composed of part of a fourth conducting film placed on top of the fourth insulating film and that is disposed to overlap part of the second conductive portion in the display area; a source electrode joined to the source wire; a drain electrode composed of a portion of the first conducting film that is different from the source wire and the source electrode; a semiconductor component that is composed of part of a semiconductor film placed at a lower layer than the first insulating film and that is disposed to overlap the source electrode and the drain electrode; a first connected portion composed of a portion of the second conducting film that is different from the heating wire and disposed to overlap the drain electrode; and a second connected portion composed of a portion of the third conducting film that is different from the second conductive portion and disposed to overlap both the first connected portion and the pixel electrode, wherein the second conductive portion serves as a common electrode that generates an electric field with the pixel electrode, the first insulating film is provided with a first contact hole placed in such a position as to overlap both the source electrode and semiconductor component and a second contact hole placed in such a position as to overlap the drain electrode and the semiconductor component, the second insulating film is provided with a third contact hole placed in such a position as to overlap both the drain electrode and the first connected portion, the third insulating film is provided with a fourth contact hole placed in such a position as to overlap both the first connected portion and the second connected portion, and the fourth insulating film is provided with a fifth contact hole placed in such a position as to overlap both the second connected portion and the pixel electrode.
4 . The display device according to claim 2 , further comprising: a fourth insulating film placed on top of the third conducting film; a common electrode that is composed of part of a fourth conducting film placed on top of the fourth insulating film and that is disposed to overlap the second conductive portion in the display area; a source electrode joined to the source wire; a drain electrode composed of a portion of the first conducting film that is different from the source wire and the source electrode; a semiconductor component that is composed of part of a semiconductor film placed at a lower layer than the first insulating film and that is disposed to overlap the source electrode and the drain electrode; and a first connected portion composed of a portion of the second conducting film that is different from the heating wire and disposed to overlap the drain electrode, wherein the second conductive portion serves as a pixel electrode that generates an electric field with the common electrode, the first insulating film is provided with a first contact hole placed in such a position as to overlap both the source electrode and semiconductor component and a second contact hole placed in such a position as to overlap the drain electrode and the semiconductor component, the second insulating film is provided with a third contact hole placed in such a position as to overlap both the drain electrode and the first connected portion, and the third insulating film is provided with a sixth contact hole placed in such a position as to overlap both the first connected portion and the pixel electrode.
5 . The display device according to claim 1 , further comprising a feeder that feeds electricity to the heating wire, wherein the second insulating film and the third insulating film are each made from an organic material, and the feeder has a power density of lower than or equal to 1000 W/mm 3 of electric power that is supplied to the heating wire.
6 . The display device according to claim 1 , further comprising a feeder that feeds electricity to the heating wire, wherein the second insulating film and the third insulating film are each made from an organic material, and the feeder has a power density of lower than or equal to 100 W/mm 3 of electric power that is supplied to the heating wire.
7 . The display device according to claim 1 , wherein the first insulating film is made from an inorganic material, and the second insulating film and the third insulating film are made from an organic material.
8 . The display device according to claim 1 , further comprising: a second substrate placed opposite the first substrate at a distance from the first substrate; and a liquid crystal layer sandwiched between the first substrate and the second substrate.

Description

BACKGROUND 1. Field The present disclosure relates to a display device that brings about improvement in yield. 2. Description of the Related Art Conventionally, as an example of a display device, a liquid crystal display device disclosed in U.S. Patent Application Publication No. 2019/0353940 has been known. The liquid crystal display device disclosed in U.S. Patent Application Publication No. 2019/0353940 includes a first substrate, a second substrate placed opposite the first substrate, a liquid crystal layer sandwiched between the first substrate and the second substrate, and a heating electrode placed at a side of the first substrate that faces the liquid crystal layer. In the liquid crystal display device disclosed in U.S. Patent Application Publication No. 2019/0353940, the heating electrode intersects a data wire located at a higher layer than the heating electrode. The heating electrode and the data wire are kept insulated from each other by an interlayer insulating layer being sandwiched therebetween. However, the interlayer insulating layer is about equal in film thickness to a gate insulating layer located at a lower layer than the heating electrode and about equal in film thickness to a foundation layer located at a lower layer than the gate insulating layer. For this reason, in a case where there occurs a defect in the interlayer insulating layer or in a case where foreign matter possessing electrical conductivity is mixed into the interlayer insulating layer, the heating electrode may become short-circuited with the data wire that the heating electrode intersects. As a result of that, there is concern that there may be deterioration in yield. It is desirable to bring about improvement in yield. SUMMARY According to an aspect of the disclosure, there is provided a display device including a first substrate having a display area where an image is displayed, a first insulating film placed on top of the first substrate, a first conductive portion that is composed of part of a first conducting film placed on top of the first insulating film and that is placed in the display area, a second insulating film placed on top of the first conducting film, a heating wire that is composed of a second conducting film placed on top of the second insulating film and that overlaps at least part of the first conductive portion in the display area, a third insulating film placed on top of the second conducting film, and a second conductive portion that is composed of part of a third conducting film placed on top of the third insulating film and that overlaps at least part of the heating wire in the display area. The second insulating film and the third insulating film are greater in film thickness than the first insulating film. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a liquid crystal panel, a flexible substrate, a control substrate, or other components of a liquid crystal display device according to Embodiment 1; FIG. 2 is a cross-sectional view of the liquid crystal panel, the flexible substrate, the control substrate, or other components according to Embodiment 1; FIG. 3 is a circuit diagram showing an electrical configuration of an array substrate constituting the liquid crystal panel according to Embodiment 1; FIG. 4 is a cross-sectional view showing a configuration of a TFT of the array substrate according to Embodiment 1 and an area therearound; FIG. 5 is a plan view showing a configuration pertaining to a heater function of the array substrate according to Embodiment 1; FIG. 6 is a cross-sectional view showing a configuration of a central part of a pixel electrode of the array substrate according to Embodiment 1 in a Y-axis direction and an area therearound; FIG. 7 is a cross-sectional view showing a configuration of a TFT of an array substrate according to Embodiment 2 and an area therearound; and FIG. 8 is a cross-sectional view showing a configuration of a central part of a pixel electrode of the array substrate according to Embodiment 2 in a Y-axis direction and an area therearound. DESCRIPTION OF THE EMBODIMENTS Embodiment 1 Embodiment 1 is described with reference to FIGS. 1 to 6. The present embodiment illustrates a liquid crystal display device 10 that is used in an on-board CMS (camera monitor system). The on-board CMS is a system that, as a replacement for a side mirror or a rearview mirror using a mirror-finished surface in an automobile, displays, on a display (liquid crystal display device 10), an image taken by a camera. Note that some of the drawings show an X axis, a Y axis, and a Z axis and are drawn so that the direction of each axis is an identical direction in each drawing. Further, FIGS. 2, 5, and 6 show front side up and back side down. As shown in FIG. 1, the liquid crystal display device 10 includes at least a liquid crystal panel (display device, display panel) 11 that has a horizontally long rectangular shape and that is capable of displaying an image and a back