KR20210077179A - Display apparatus - Google Patents

Abstract

A display device according to one embodiment of the present invention may comprise: a first substrate having flexibility; a digitizer comprising a first electrode disposed on a lower part of a first substrate in a first direction and a second electrode disposed on the first substrate in a second direction different from that of the first direction; an inorganic insulating layer disposed on the first substrate to cover the second electrode; a second substrate disposed on the inorganic insulating layer; and a light emitting element disposed on the second substrate. Therefore, the present invention is capable of allowing a thickness of the display device to be reduced.

Description

display device {DISPLAY APPARATUS}

The present invention relates to a display device, and more particularly, to a panel-integrated display device capable of reducing a display panel thickness.

Display devices used in computer monitors, TVs, and mobile phones include organic light emitting displays (OLEDs) that emit light by themselves, and liquid crystal displays (LCDs) that require a separate light source. have.

A display device is being applied to a personal portable device as well as a computer monitor and TV, and research on a display device having a large display area and reduced volume and weight is being conducted.

Also, in recent years, a foldable display device that can be freely folded and unfolded by forming a light emitting element and wiring on a flexible substrate such as plastic, which is a flexible material, is attracting attention as a next-generation display device.

The display device may include components constituting the display device and an adhesive layer disposed between each component. For example, the display device includes a display panel, a back plate under the display panel, a touch panel over the display panel, a polarizer, a cover window, and the like, and an adhesive layer is disposed between the respective components to form the display panel and the back plate. , a touch panel, a polarizing plate, a cover window, etc. may be integrally formed.

Meanwhile, the display device may include a digitizer that converts coordinates according to a user's touch input into a digital format and visually implements the coordinates according to the user's touch input on the display panel. The digitizer is formed in a structure in which electrodes are disposed above and below a substrate, and may be formed in the form of a separate substrate or film under the display panel.

However, when the digitizer is separately configured under the display panel, the thickness of the display device may increase. In particular, when a film-type digitizer is applied to a flexible display device such as a foldable display device or a rollable display device, when the display device is bent due to an increase in thickness of the display device, a great stress may occur in the display device.

Accordingly, the inventors of the present invention have invented a display device having a new structure capable of reducing stress generated on the display panel and the display device when the display device is folded.

Accordingly, an object of the present invention is to provide a display device capable of improving the display panel and stress generated in the display device when the display device is folded by configuring a digitizer on a substrate used in the display panel.

Another object of the present invention is to provide a display device capable of reducing damage to a substrate on which a digitizer is disposed.

Another object of the present invention is to provide a display device capable of improving reliability of a digitizer.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A display device according to an embodiment of the present invention includes a first substrate having flexibility, a first electrode disposed under the first substrate in a first direction, and a first electrode different from the first direction on the first substrate. A digitizer including a second electrode disposed in two directions, an inorganic insulating layer disposed on a first substrate to cover the second electrode, a second substrate disposed on the inorganic insulating layer, and a light emitting device disposed on the second substrate may include.

A display device according to another exemplary embodiment of the present invention has an insulating member, a digitizer disposed on the insulating member, and a digitizer including the first and second electrodes, the first electrode and the second electrode, and having flexibility. A first substrate, an inorganic insulating layer disposed on the digitizer, a second substrate disposed on the inorganic insulating layer, and a light emitting device disposed on the second substrate, wherein the first electrode is in contact with a lower surface of the first substrate and the second electrode may be disposed to be in contact with the upper surface of the first substrate.

The details of other embodiments are included in the detailed description and drawings.

According to the present invention, the thickness of the display device can be reduced by implementing the digitizer on the substrate of the display panel.

According to the present invention, damage to the substrate of the display panel can be reduced when the digitizer is formed.

The present invention can protect the electrode of the digitizer from moisture and oxygen.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present invention.

1 is an exploded perspective view of a display device according to an exemplary embodiment.
2 is a plan view of a display panel of a display device according to an exemplary embodiment.
3 is an exploded perspective view of a display panel of a display device according to an exemplary embodiment.
4 is a cross-sectional view taken along line IV-IV' of FIG. 3 .
5 is a cross-sectional view of a display panel of a display device according to another exemplary embodiment.
6 is a cross-sectional view of a display panel of a display device according to another exemplary embodiment.
7A and 7B are cross-sectional views of a display panel of a display device according to another exemplary embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different shapes, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, areas, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative and the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When 'include', 'have', 'consists of', etc. mentioned in the present invention are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is interpreted as including an error range even if there is no separate explicit description.

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between the two parts unless 'directly' is used.

Reference to a device or layer “on” another device or layer includes any intervening layer or other device directly on or in the middle of another device.

Also, although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.

Like reference numerals refer to like elements throughout.

The area and thickness of each component shown in the drawings are shown for convenience of description, and the present invention is not necessarily limited to the area and thickness of the illustrated component.

Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be implemented independently of each other or may be implemented together in a related relationship. may be

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view of a display device according to an exemplary embodiment. 2 is a plan view of a display panel of a display device according to an exemplary embodiment. In FIG. 2 , only the display panel 120 is illustrated among various components of the display device 100 for convenience of explanation.

Referring to FIG. 1 , the display device 100 includes a back plate 110 , a display panel 120 , a polarizing plate 130 , and a cover window 140 .

Referring to FIG. 1 , a display panel 120 is a panel on which an image is implemented, and a light emitting device for realizing an image and a circuit, wiring, and components for driving the light emitting device may be disposed. The display panel 120 may be a flexible display panel. For example, the display panel 120 may be a foldable display panel that can be folded or a rollable display panel that can be wound on a roller. Hereinafter, it is assumed that the display panel 120 is a foldable display panel for convenience of description, but the present invention is not limited thereto.

The display panel 120 includes a display area AA and a non-display area NA. In addition, the display panel 120 includes a folding area FA and a non-folding area NFA. The display panel 120 may classify an area according to whether an image is displayed, and may classify the area according to whether it is folded. A specific area of the display panel 120 may be defined according to whether an image is displayed or whether it is folded. For example, the specific area of the display panel 120 may be the display area AA and the folding area FA.

The display area AA is an area for displaying an image, and a plurality of sub-pixels including a light emitting device for displaying an image and a circuit unit for driving the light emitting device may be disposed. The circuit unit may include various thin film transistors, storage capacitors, and wires for driving the organic light emitting diode. For example, the circuit unit may include various components such as a driving thin film transistor, a switching thin film transistor, a storage capacitor, a gate line, and a data line, but is not limited thereto.

The non-display area NA is an area in which an image is not displayed, and is an area in which circuits, wires, and components for driving the light emitting device of the display area AA are disposed. A driving IC such as a gate driver IC and a data driver IC may be disposed in the non-display area NA.

The non-display area NA may be defined as an area surrounding the display area AA as shown in FIG. 2 . However, the non-display area NA may be defined as an area extending from the display area AA or may be defined as an area in which a light emitting device is not disposed, but is not limited thereto.

Meanwhile, the display panel 120 may be defined as a display area AA and a non-display area NA, but may also be defined as a folding area FA and a non-folding area NFA.

The folding area FA is an area in which the display panel 120 is folded, that is, a bendable area. The folding area FA is a folded area based on the folding axis FX, and the folding area FA may be folded with a specific radius of curvature. Since the folding area FA is an area in which the display panel 120 is folded, it may also be defined as the folding area FA. The folding area FA includes a portion of the display area AA and a portion of the non-display area NA adjacent to the folding axis FX.

Although FIG. 2 illustrates that the folding axis FX is disposed in the center of the display panel 120 , the position and number of the folding axes FX may be variously changed, and the position and number of the folding axes FX may vary depending on the position and number of the folding axes FX. Accordingly, the folding area FA may also be variously changed, but is not limited thereto.

The non-folding area NFA is an area in which the display panel 120 maintains a flat state. The non-folding area NFA includes a portion of the display area AA and a portion of the non-display area NA. The non-folding area NFA is an area in which the display panel 120 is not folded, and may also be defined as the non-folding area NFA. The non-folding area NFA may extend to both sides of the folding area FA. Two non-folding areas NFA may be disposed with the folding area FA interposed therebetween.

The non-folding area NFA includes a first non-folding area NFA1 and a second non-folding area NFA2 . The first non-folding area NFA1 is a non-folding area NFA extending to the left of the folding axis FX. The second non-folding area NFA2 is a non-folding area NFA extending to the right of the folding axis FX.

When the display device 100 is in an unfolded, non-folding state, the folding area FA and the non-folding area NFA may form a single plane. For example, when the display device 100 is in a flat unfolded non-folding state, the folding area FA, the first non-folding area NFA1, and the second non-folding area NFA2 may form a single plane.

When the display device 100 is in a folded state, the non-folding areas NFA on both sides of the folding area FA may be disposed to face each other while maintaining a flat state. In this case, the display device 100 is disposed so that the first non-folding area NFA1 and the second non-folding area NFA2 face each other on the upper surface or the lower surface of the display device 100 according to the folding direction of the display device 100 . can be For example, when the display device 100 is in-folded, the top surface of the display device 100 overlaps the first non-folding area NFA1 and the second non-folding area NFA2, respectively. They can be folded to face each other. Conversely, when the display device 100 is folded out, the display device 100 is configured such that the lower surfaces of the display device 100 overlapping the first non-folding area NFA1 and the second non-folding area NFA2, respectively, face each other. Can be folded. Hereinafter, for convenience of explanation, it is assumed that the display device 100 according to an embodiment of the present invention is in-folding, but the present invention is not limited thereto.

Again, referring to FIG. 1 , the cover window 140 may protect the polarizing plate 130 and the display panel 120 under the cover window 140 from external impact, moisture, heat, and the like. The cover window 140 may be made of a material having impact resistance and light transmittance. For example, the cover window 140 may be a substrate made of glass or made of a plastic material such as polymethylmethacrylate (PMMA), polyimide (PI), or polyethylene terephthalate (PET). It may be a thin film, but is not limited thereto.

The cover window 140 may be made of a material having a large tensile Young's modulus and modulus value, that is, a material having high hardness, in order to reduce cracks due to external impact. In the case of a material having a large modulus value, when the display device 100 is folded, it may be broken rather than bent. However, even if the material has a large modulus value, folding may be possible if the thickness is less than a predetermined thickness. Accordingly, the cover window 140 may have a very thin thickness. For example, the cover window 140 may be a thin plastic film, but is not limited thereto.

Meanwhile, although not shown in the drawings, a hard coating layer may be further disposed on one or both surfaces of the cover window 140 in order to improve the surface hardness of the cover window 140 , but is not limited thereto.

A polarizing plate 130 is disposed under the cover window 140 . The polarizing plate 130 selectively transmits light to reduce reflection of external light incident on the display panel 120 . Specifically, the display panel 120 includes various metal materials applied to thin film transistors, wirings, light emitting devices, and the like. Accordingly, the external light incident on the display panel 120 may be reflected from the metal material, and the visibility of the display device 100 may be reduced due to the reflection of the external light. Accordingly, by arranging the polarizing plate 130 on one surface of the display panel 120 , it is possible to prevent reflection of external light and to increase outdoor visibility of the display device 100 . However, the components of the display device 100 of FIGS. 1 and 2 are exemplary, and the polarizer 130 may be omitted depending on the embodiment of the display device 100 .

Meanwhile, a touch panel may be further disposed between the display panel 120 and the polarizer 130 . The touch panel is a configuration that detects a user's touch input such as a screen touch or a gesture on the foldable display device 100 , and may be implemented using a capacitive method or the like.

The back plate 110 is disposed under the display panel 120 . When the substrate constituting the display panel 120 is made of a plastic material such as polyimide, a manufacturing process of the display device 100 is performed after attaching a support substrate made of glass to the lower portion of the substrate, and the display panel 120 is disposed on the display panel 120 . After forming the components such as the polarizing plate 130 , the support substrate may be detached. In addition, after the support substrate is detached, the back plate 110 for supporting the substrate may be disposed under the substrate of the display panel 120 . The back plate 110 may not only support the display panel 120 , but may also protect the display panel 120 from external moisture, heat, impact, and the like.

Meanwhile, an adhesive layer may be disposed between each component of the display device 100 . The adhesive layer is disposed between other components of the display device 100 to bond each component to other components. Specifically, the adhesive layer may be disposed between the cover window 140 and the polarizing plate 130 , between the polarizing plate 130 and the display panel 120 , and between the display panel 120 and the back plate 110 , respectively. The adhesive layer may be made of a material having an adhesive property, and may be made of, for example, Optical Clear Adhesive (OCA), Pressure Sensitive Adhesive (PSA), or the like, but is not limited thereto.

Meanwhile, although not shown in the drawings, a mid frame may be further disposed under the back plate 110 . The mid frame may be made of a rigid material such as metal to protect and support the back plate 110 and the display panel 120 on the mid frame.

Hereinafter, referring to FIGS. 3 and 4 together for a more detailed description of the display panel 120 .

3 is an exploded perspective view of a display panel of a display device according to an exemplary embodiment. 4 is a cross-sectional view taken along line IV-IV' of FIG. 3 . In FIG. 3 , a wiring connecting the first electrode 122a and the second electrode 122b of the digitizer 122 and the printed circuit board 126 is omitted for convenience of description.

3 and 4 , the display panel 120 includes an insulating member 125 , a first substrate 121 , a digitizer 122 , an inorganic insulating layer 123 , a second substrate 124 , and a light emitting device. include

The insulating member 125 is disposed at the lowermost end of the display panel 120 . The insulating member 125 may be formed of an organic insulating layer or an inorganic insulating layer to protect components disposed on the insulating member 125 . For example, when the insulating member 125 is formed of an organic insulating layer, an acrylic resin, an epoxy resin, a phenol resin, a polyamide-based resin, a polyimide-based resin, an unsaturated polyester-based resin, a polyphenylene-based resin, or a polyphenylene It may be formed of one of a sulfide-based resin, benzocyclobutene, and a photoresist, but is not limited thereto. In addition, the insulating member 125 is made of an inorganic insulating layer, and it is possible to suppress penetration of moisture or oxygen. The insulating member 125 may be made of silicon nitride (SiNx), silicon oxynitride (SiNxOy), or aluminum oxide (AlyOz), but is not limited thereto.

A digitizer 122 is disposed on the insulating member 125 . The digitizer 122 may convert X and Y coordinates according to a pen or a user's touch input into a digital format, and visually implement it on the display panel 120 in response to the user's touch input. The digitizer 122 may be, for example, a pressure sensor, but is not limited thereto.

The digitizer 122 includes a first electrode 122a and a second electrode 122b. The first electrode 122a and the second electrode 122b may be formed of a transparent conductive material or a metal material. For example, when the first electrode 122a and the second electrode 122b are made of a transparent conductive material, indium tin oxide (ITO), indium zinc oxide (IZO), or indium tin zinc It may be made of indium tin zinc oxide (ITZO), and when the first electrode 122a and the second electrode 122b are made of a metal material, molybdenum (Mo), aluminum (Al), chromium (Cr), gold Any one of (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), an alloy of two or more thereof, or a multilayer thereof may be formed. In addition, the first electrode 122a and the second electrode 122b may be made of a flexible material such as nanowires (AgNW), carbon nanotubes (CNT), or graphene. However, the first electrode 122a and the second electrode 122b may be made of the same material, but the present invention is not limited thereto, and the first electrode 122a and the second electrode 122b may be made of a different material. have.

The first electrode 122a may be disposed on the insulating member 125 . The first electrode 122a may be, for example, formed in a bar shape and disposed in a first direction that is an X-axis direction. In this case, the first direction may be the same as the longitudinal direction of the insulating member 125 . 3 shows that the number of the first electrodes 122a is four, the number of the first electrodes 122a may be variously changed according to the design, but is not limited thereto.

A first substrate 121 is disposed on the first electrode 122a. The first substrate 121 may be disposed to cover the first electrode 122a to support and protect various components disposed on the first substrate 121 . The first substrate 121 may be formed of an insulating material having a high glass transition temperature (TG). For example, the first substrate 121 may have high heat resistance such as colored polyimide, polyethylene naphthalate (PEN), aramide, or the like and plastic having flexibility. ) can be made of a material.

A second electrode 122b is disposed on the first substrate 121 . The second electrode 122b may be formed, for example, in a bar shape and disposed to overlap the first electrode 122a. Also, the second electrode 122b may be disposed in a second direction different from the first direction in which the first electrode 122a is disposed. The first direction and the second direction may be directions perpendicular to each other, but is not limited thereto. Although 4 second electrodes 122b are illustrated in FIG. 3 , the number of second electrodes 122b may be variously changed according to a design, but is not limited thereto.

The first electrode 122a and the second electrode 122b of the digitizer 122 constitute a capacitor with the first substrate 121 interposed therebetween, so that a capacitance between the first electrode 122a and the second electrode 122b is formed. The intensity of the touch input may be measured based on the change amount. Accordingly, a predetermined voltage may be applied to the second electrode 122b to form a capacitance between the first electrode 122a and the second electrode 122b, and the second electrode 122b may be grounded or the second electrode ( A voltage different from the voltage applied to 122b) may be applied. For example, when a strong touch input is applied, the first substrate 121 may be compressed to reduce a gap between the first electrode 122a and the second electrode 122b. Accordingly, a change in capacitance occurs between the first electrode 122a and the second electrode 122b. On the other hand, when a weak touch input is applied, the first substrate 121 is relatively weakly compressed, so that the gap between the first electrode 122a and the second electrode 122b may be reduced to a relatively small extent. Accordingly, the capacitance between the first electrode 122a and the second electrode 122b may change slightly. Accordingly, by measuring the capacitance between the first electrode 122a and the second electrode 122b, the intensity of the touch input may be measured. However, the present invention is not limited thereto, and another method may be used as the measurement method of the digitizer 122 .

An inorganic insulating layer 123 is disposed on the first substrate 121 and the second electrode 122b. The inorganic insulating layer 123 may be disposed to cover the second electrode 122b to protect the second electrode 122b from external moisture, oxygen, impact, and the like. The inorganic insulating layer 123 may be made of an inorganic material such as silicon nitride (SiNx) or silicon oxynitride (SiON), but is not limited thereto.

A second substrate 124 is disposed on the inorganic insulating layer 123 . The second substrate 124 may be formed to have the same size as the inorganic insulating layer 123 . In addition, the second substrate 124 may be made of the same material as the first substrate 121 , but is not limited thereto.

Meanwhile, although not shown in FIGS. 3 and 4 , a thin film transistor and a light emitting device may be disposed on the second substrate 124 . The light emitting device may configure a pixel of the display device 100 by receiving an electrical signal from the thin film transistor.

Referring back to FIG. 3 , the display device 100 may further include a printed circuit board 126 . The printed circuit board 126 may transmit or receive an electrical signal to the digitizer 122 . For example, various components such as an IC chip, a circuit unit, and a memory may be mounted on the printed circuit board 126 , but is not limited thereto.

Referring to FIG. 3 , the printed circuit board 126 includes a first printed circuit board 126a and a second printed circuit board 126b to be bonded to the first printed circuit board 121 and the insulating member 125 , respectively. can

The first substrate 121 may have a size larger than that of the second substrate 124 so that the first printed circuit board 126a may be bonded to the edge thereof. That is, a portion of the first substrate 121 may overlap the second substrate 124 , and another portion may not overlap the second substrate 124 . Accordingly, the first printed circuit board 126a is a region of the first substrate 121 that does not overlap the second substrate 124 , that is, a pad region of the first substrate 122 that protrudes from the second substrate 124 . and may be electrically connected to the second electrode 122b of the digitizer 122 through pads and wires formed on the first substrate 122 .

Similarly, the insulating member 125 may be formed to have a size larger than that of the first substrate 121 so that the second printed circuit board 126b may be bonded to the edge thereof. That is, a portion of the insulating member 125 may overlap the first substrate 121 , and another portion may not overlap the first substrate 121 . Accordingly, the second printed circuit board 126b is bonded to a region of the insulating member 125 that does not overlap the first substrate 121 , that is, a pad region of the insulating member 125 that protrudes from the first substrate 121 . Thus, the first electrode 122a of the digitizer 122 may be electrically connected to each other through pads and wires formed on the insulating member 125 .

Meanwhile, the display panel 120 includes an insulating member 125 , a digitizer 122 , a first substrate 121 , an inorganic insulating layer 123 , a second substrate 124 , and a light emitting device on a support substrate made of glass. After the components are formed, the supporting substrate can be detached. Specifically, the insulating member 125 may be formed on the support substrate, and the first electrode 122a of the digitizer 122 may be deposited and etched on the insulating member 125 to be formed. Next, a first substrate 121 is formed to cover the first electrode 122a of the digitizer 122 , and the second electrode 122b of the digitizer 122 is deposited and etched on the first substrate 121 . can be formed. In addition, an inorganic insulating layer 123 may be formed to cover the second electrode 122b , and a second substrate 124 and a light emitting device may be formed on the inorganic insulating layer 123 . Accordingly, after all components of the display panel 120 are formed on the support substrate, the support substrate is detached from the insulating member 125 to manufacture the display panel 120 .

In a general display device, a digitizer is configured in the form of a separate substrate or film under the display panel. However, since the digitizer is designed by crossing electrodes on the upper and lower portions of the substrate, the thickness of the display device may increase when the digitizer is configured in the form of a separate substrate or film. In particular, when a digitizer is applied to a flexible display device such as a foldable display device or a rollable display device, a great stress may occur in the display device due to an increase in the thickness of the display device. There were difficulties in applying it.

Accordingly, in the display device 100 according to an exemplary embodiment, the digitizer 122 may be implemented on the first substrate 121 to reduce the overall thickness of the display device 100 . For example, the first electrode 122a of the digitizer 122 may be disposed on the lower surface of the first substrate 121 , and the second electrode 122b may be disposed on the upper surface of the first substrate 121 . Accordingly, the first substrate 121 is compressed according to the intensity of the touch input applied to the display panel 120 , and the intensity of the touch input is measured by a change in capacitance between the first electrode 122a and the second electrode 122b. can be Accordingly, by implementing the digitizer 122 on the first substrate 121 , a separate digitizer 122 included in the display device 100 may be omitted, and thus the display device 100 with reduced thickness may be implemented. can

In addition, in the display device 100 according to an embodiment of the present invention, the first substrate 121 is made of a material having a high glass transition temperature, so that the first substrate 121 is damaged during the digitizer 122 forming process. can be reduced The first electrode 122a and the second electrode 122b of the digitizer 122 may be formed by depositing or etching a metal material or a transparent conductive material on the first substrate 121 . That is, since the digitizer 122 forming process is performed at a high temperature, when the glass transition temperature of the first substrate 121 is low, the first substrate 121 may be damaged. Accordingly, in the display device 100 according to an embodiment of the present invention, the first substrate 121 is formed of a material having a high glass transition temperature and high heat resistance, and during the digitizer 122 forming process, the first substrate 121 is formed. damage can be reduced.

5 is a cross-sectional view of a display panel of a display device according to another exemplary embodiment. Compared to the display device 100 of FIGS. 1 to 4 , in the display device 500 of FIG. 5 , only the protective layer 527 is added, and other configurations are substantially the same, and thus a redundant description will be omitted.

Referring to FIG. 5 , the display device 500 includes a protective layer 527 . The passivation layer 527 is disposed to contact the upper surface of the insulating member 125 and the upper surface of the first substrate 121 . When the first electrode 122a and the second electrode 122b of the digitizer 122 are deposited or etched on the insulating member 125 and the first substrate 121 , the protective layer 527 is formed by the insulating member 125 . 1 It is possible to reduce damage to the substrate 121 .

The protective layer 527 may be formed of a primer layer or an inorganic insulating material. For example, when the protective layer 527 is made of a primer layer, the protective layer 527 may be a primer layer made of an acrylic adhesive, urethane, acrylic resin, urethane resin, or the like, but is not limited thereto. In addition, when the protective layer 527 is made of an inorganic insulating material, it may be made of the same material as the inorganic insulating layer 123 , but is not limited thereto.

The passivation layer 527 includes a first passivation layer 527a and a second passivation layer 527b.

The first passivation layer 527a may be disposed under the first substrate 121 and the first electrode 122a to contact the upper surface of the insulating member 125 . That is, the first passivation layer 527a may be disposed between the insulating member 125 and the first substrate 121 and the first electrode 122a. The first passivation layer 527a may be disposed on the upper surface of the insulating member 125 to be in contact with the lower surface of the first substrate 121 and the first electrode 122a.

The second passivation layer 527b is disposed to contact the top surface of the first substrate 121 . In addition, a second electrode 122b may be disposed on the second passivation layer 527b. Accordingly, the second passivation layer 527b may be disposed between the second electrode 122b, the inorganic insulating layer 123 and the first substrate 121 .

Meanwhile, the first electrode 122a and the second electrode 122b of the digitizer 122 may be formed after the protective layer 527 is formed. Specifically, the first passivation layer 527a may be formed on the insulating member 125 , and the first electrode 122a may be deposited and etched on the first passivation layer 527a to be formed. Then, the first substrate 121 is formed to cover the first electrode 122a of the digitizer 122 , and after the second protective layer 527b is formed on the first substrate 121 , the second protective layer ( The second electrode 122b may be deposited and etched on the 527b. In addition, an inorganic insulating layer 123 may be formed to cover the second electrode 122b , and a second substrate 124 and a light emitting device may be formed on the inorganic insulating layer 123 .

In the display device 500 according to another embodiment of the present invention, a protective layer 527 is disposed on the upper surface of the insulating member 125 and the upper surface of the first substrate 121 to form the digitizer 122, the insulating member ( 125 ) and damage to the first substrate 121 may be reduced. The first electrode 122a and the second electrode 122b of the digitizer 122 may be formed by depositing or etching the insulating member 125 and the first substrate 121 . Specifically, the first electrode 122a may be formed on the insulating member 125 , and the second electrode 122b may be formed on the first substrate 121 . In this case, the insulating member 125 and the first substrate 121 may be deformed due to high temperature or may be partially etched and damaged. Accordingly, even when a deposition or etching process is performed by disposing the protective layer 527 on the upper surface of the insulating member 125 and the upper surface of the first substrate 121 , the insulating member 125 and the first substrate 121 are damaged. can be reduced

6 is a cross-sectional view of a display panel of a display device according to another exemplary embodiment. Compared to the display device 100 of FIGS. 1 to 4 , the display device 600 of FIG. 6 has only a different insulating member 625 , and other configurations are substantially the same, and thus a redundant description will be omitted.

Referring to FIG. 6 , an insulating member 625 is disposed under the first substrate 121 and the first electrode 122a. The insulating member 625 may be a third substrate 625 made of the same material as the first substrate 121 or the second substrate 124 . That is, the third substrate 625 is a plastic material having high heat resistance and flexibility, such as colored polyimide, polyethylene naphthalate (PEN), aramide, or the like. may be disposed so as to be in contact with the lower surface of the first substrate 121 and the lower surface of the first electrode 122a. Accordingly, the first electrode 122a may be insulated by the third substrate 625 .

Meanwhile, the display panel of the display device 600 includes a third substrate 625 , a digitizer 122 , a first substrate 121 , an inorganic insulating layer 123 , and a second substrate 124 on a support substrate made of glass. and after the light emitting device is formed, the supporting substrate may be detached. Specifically, the third substrate 625 may be formed on a support substrate, and the first electrode 122a of the digitizer 122 may be deposited and etched on the third substrate 625 to be formed. Next, a first substrate 121 is formed to cover the first electrode 122a of the digitizer 122 , and the second electrode 122b of the digitizer 122 is deposited and etched on the first substrate 121 . can be formed. In addition, an inorganic insulating layer 123 may be formed to cover the second electrode 122b , and a second substrate 124 and a light emitting device may be formed on the inorganic insulating layer 123 . Accordingly, after all components of the display panel of the display device 600 of FIG. 6 are formed on the support substrate, the support substrate is detached from the third substrate 625 to manufacture the display panel.

In the display device 600 according to another embodiment of the present invention, the third substrate 625 is disposed under the first substrate 121 and the first electrode 122a and disposed on the third substrate 625 . components can be protected. The third substrate 625 may be made of the same material as the first substrate 121 or the second substrate 124 and may be disposed to cover the lower surface of the first substrate 121 and the lower surface of the first electrode 122a. . For example, the third substrate 625 may be made of a material having a high glass transition temperature and good heat resistance, such as polyimide, polyethylene naphthalate, aramid, or the like. Accordingly, the third substrate 625 protects the first electrode 122a from external moisture and oxygen, and at the same time provides a thin film transistor and a light emitting device disposed on the first substrate 121 and the second substrate 124 . It can be protected from impact.

7A and 7B are cross-sectional views of a display panel of a display device according to another exemplary embodiment of the present invention. Compared to the display device 600 of FIG. 6 , only the inorganic insulating layers 728A and 728B are added to the display devices 700A and 700B of FIGS. 7A and 7B , and other configurations are substantially the same, so a redundant description will be omitted. .

7A and 7B , the display devices 700A and 700B may further include inorganic insulating layers 728A and 728B between the first substrate 121 and the third substrate 625 . The inorganic insulating layers 728A and 728B may be disposed on the third substrate 625 to protect components disposed on the third substrate 625 from external moisture, oxygen, impact, and the like. The inorganic insulating layers 728A and 728B may be formed of the same material as the inorganic insulating layers 728A and 728B disposed on the second electrode 122b, but are not limited thereto.

Referring to FIG. 7A , the inorganic insulating layer 728A may be disposed to contact the lower surface of the first substrate 121 and the lower surface of the first electrode 122a. Accordingly, an upper surface of the inorganic insulating layer 728A may be in contact with a lower surface of the first substrate 121 and a lower surface of the first electrode 122a , and a lower surface of the inorganic insulating layer 728A may be in contact with an upper surface of the third substrate 625 .

Meanwhile, in FIG. 7A , the first electrode 122a of the digitizer 122 may be formed after the inorganic insulating layer 728A is formed. Specifically, the inorganic insulating layer 728A may be formed on the third substrate 625 , and the first electrode 122a may be deposited and etched on the inorganic insulating layer 728A to be formed. In addition, the first substrate 121 may be formed to cover the first electrode 122a of the digitizer 122 , and the second electrode 122b may be deposited and etched on the first substrate 121 to be formed. In addition, an inorganic insulating layer 123 may be formed to cover the second electrode 122b , and a second substrate 124 and a light emitting device may be formed on the inorganic insulating layer 123 .

Also, referring to FIG. 7B , the inorganic insulating layer 728B may be disposed to cover the first electrode 122a disposed on the third substrate 625 . Accordingly, the inorganic insulating layer 728B is disposed to cover the upper surface of the third substrate 625 and the upper surface and side surfaces of the first substrate 121 , and the upper surface of the inorganic insulating layer 728B is the upper surface of the first substrate 121 . It may be disposed so as to be in contact with the lower surface.

Meanwhile, in FIG. 7B , the first electrode 122a of the digitizer 122 may be formed by deposition and etching on the third substrate 625 . In addition, an inorganic insulating layer 728B may be formed to cover the first electrode 122a of the digitizer 122 , and a first substrate 121 may be formed on the inorganic insulating layer 728B. In addition, the second electrode 122b may be deposited and etched on the first substrate 121 to be formed. After the inorganic insulating layer 123 is formed to cover the second electrode 122b, the inorganic insulating layer 123 is formed. ) on the second substrate 124 and the light emitting device may be formed.

In the display devices 700A and 700B according to another embodiment of the present invention, inorganic insulating layers 728A and 728B are disposed between the first substrate 121 and the third substrate 625 to form the first electrode 122a. can be protected from external moisture and oxygen. The first electrode 122a is made of a conductive material and may be vulnerable to moisture and oxygen. Accordingly, the inorganic insulating layers 728A and 728B are disposed between the first substrate 121 and the third substrate 625 to cover the lower surface of the first electrode 122a or to cover the first electrode 122a. Thus, the first electrode 122a may be protected from external moisture and oxygen.

Display devices according to embodiments of the present invention may be described as follows.

A display device according to an embodiment of the present invention includes a first substrate having flexibility, a first electrode disposed under the first substrate in a first direction, and a first electrode different from the first direction on the first substrate. A digitizer including a second electrode disposed in two directions, an inorganic insulating layer disposed on a first substrate to cover the second electrode, a second substrate disposed on the inorganic insulating layer, and a light emitting device disposed on the second substrate may include.

According to another feature of the present invention, the display device may further include a first passivation layer disposed under the first substrate and the first electrode, and a second passivation layer disposed between the first substrate and the second electrode.

According to another feature of the present invention, the first protective layer and the second protective layer may be formed of a primer layer or an inorganic insulating material.

According to another feature of the present invention, the display device may further include an insulating member disposed under the first substrate and the first electrode.

According to another feature of the present invention, the insulating member may be an organic insulating layer or an inorganic insulating layer.

According to another feature of the present invention, the insulating member may be a third substrate made of the same material as the first substrate or the second substrate.

According to another feature of the present invention, the third substrate may be disposed to be in contact with the first electrode.

According to another feature of the present invention, the display device is disposed between the first substrate and the third substrate to cover the lower surfaces of the first substrate and the first electrode, or to cover the upper surfaces of the third substrate and the first electrode. It may further include an inorganic insulating layer.

According to another feature of the present invention, the display device further includes a first printed circuit board for driving the digitizer, the first board having a size larger than that of the second board, and the first printed circuit board being the second of the first boards. 2 It can be bonded to a region protruding from the substrate.

According to another feature of the present invention, the display device further includes a second printed circuit board for driving the digitizer, the insulating member has a size larger than that of the first substrate, and the second printed circuit board is a first substrate among the insulating members It can be bonded to a more protruding area.

According to another feature of the present invention, the first substrate and the second substrate may be made of colored polyimide, polyethylene naphthalate (PEN), or aramide.

According to another aspect of the present invention, the display device may be a foldable display device including a folding area and a non-folding area.

A display device according to another exemplary embodiment of the present invention has an insulating member, a digitizer disposed on the insulating member, and a digitizer including the first and second electrodes, the first electrode and the second electrode, and having flexibility. A first substrate, an inorganic insulating layer disposed on the digitizer, a second substrate disposed on the inorganic insulating layer, and a light emitting device disposed on the second substrate, wherein the first electrode is in contact with a lower surface of the first substrate and the second electrode may be disposed to be in contact with the upper surface of the first substrate.

According to another feature of the present invention, the display device may further include a protective layer disposed below the first substrate and the first electrode and between the first substrate and the second electrode.

According to another feature of the present invention, the insulating member may be made of an organic material or an inorganic material.

According to another feature of the present invention, the insulating member may be a third substrate made of the same material as the first substrate or the second substrate.

According to another feature of the present invention, the display device may further include an inorganic insulating layer disposed between the first substrate and the third substrate.

According to another feature of the present invention, the display device may further include a plurality of printed circuit boards disposed on an edge of the first substrate or an edge of the insulating member.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100, 500, 600, 700A, 700B: display device
110: back plate
120: display panel
121: first substrate
122: digitizer
122a: first electrode
122b: second electrode
123: inorganic insulating layer
124: second substrate
125: insulation member
625: third substrate
728A, 728B: inorganic insulating layer
126: printed circuit board
526: protective layer
526a: first protective layer
526b: second protective layer
130: polarizer
140: back plate
AA: display area
NA: non-display area
FA: Folding area
NFA: non-folding area
NFA1: first non-folding area
NFA2: second non-folding area
FX: folding axis

Claims (18)

a first substrate having flexibility;
a digitizer including a first electrode disposed under the first substrate in a first direction and a second electrode disposed on the first substrate in a second direction different from the first direction;
an inorganic insulating layer disposed on the first substrate to cover the second electrode;
a second substrate disposed on the inorganic insulating layer; and
and a light emitting element disposed on the second substrate. According to claim 1,
a first protective layer disposed under the first substrate and the first electrode; and
and a second passivation layer disposed between the first substrate and the second electrode. 3. The method of claim 2,
The first passivation layer and the second passivation layer are formed of a primer layer or an inorganic insulating material. According to claim 1,
The display device of claim 1 , further comprising an insulating member disposed under the first substrate and the first electrode. 5. The method of claim 4,
and the insulating member is an organic insulating layer or an inorganic insulating layer. 5. The method of claim 4,
and the insulating member is a third substrate made of the same material as the first substrate or the second substrate. 7. The method of claim 6,
and the third substrate is in contact with the first electrode. 7. The method of claim 6,
An inorganic insulating layer disposed between the first substrate and the third substrate to cover lower surfaces of the first substrate and the first electrode, or to cover upper surfaces of the third substrate and the first electrode. which is a display device. 5. The method of claim 4,
Further comprising a first printed circuit board for driving the digitizer,
The first substrate is larger in size than the second substrate,
and the first printed circuit board is bonded to an area of the first board that protrudes from the second board. 10. The method of claim 9,
a second printed circuit board for driving the digitizer;
The insulating member is larger in size than the first substrate,
and the second printed circuit board is bonded to an area of the insulating member that protrudes from the first substrate. According to claim 1,
The first substrate and the second substrate are made of colored polyimide, polyethylene naphthalate (PEN), or aramide. According to claim 1,
The display device is a foldable display device including a folding area and a non-folding area. insulating member;
a digitizer disposed on the insulating member and including a first electrode and a second electrode;
a first substrate disposed between the first electrode and the second electrode and having flexibility;
an inorganic insulating layer disposed on the digitizer;
a second substrate disposed on the inorganic insulating layer; and
a light emitting device disposed on the second substrate;
The first electrode is disposed to contact a lower surface of the first substrate, and the second electrode is disposed to contact an upper surface of the first substrate. 14. The method of claim 13,
and a protective layer disposed under the first substrate and the first electrode and between the first substrate and the second electrode. 14. The method of claim 13,
The insulating member is made of an organic material or an inorganic material. 16. The method of claim 15,
and the insulating member is a third substrate made of the same material as the first substrate or the second substrate. 17. The method of claim 16,
The display device of claim 1 , further comprising an inorganic insulating layer disposed between the first substrate and the third substrate. 14. The method of claim 13,
The display device of claim 1 , further comprising: a plurality of printed circuit boards disposed on an edge of the first substrate or an edge of the insulating member.

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