1. A display device is provided with:

a display panel;

a shock dispersion layer provided on a light extraction side of the display panel and having a Young's modulus of 50GPa or more;

a deformation mitigating layer provided between the impact dispersing layer and the display panel and having a Young's modulus lower than that of the impact dispersing layer; and

and an impact absorbing layer which is provided between the deformation relaxation layer and the display panel and has a storage modulus of 10kPa or more and 1MPa or less at room temperature.

2. A display device is provided with:

a display panel;

a shock dispersion layer provided on a light extraction side of the display panel and having a Young's modulus of 50GPa or more;

a deformation mitigating layer provided between the impact dispersing layer and the display panel and having a Young's modulus lower than that of the impact dispersing layer;

an impact absorbing layer provided between the deformation mitigating layer and the display panel and having a gel-like shape; and

and a first pole face which is provided on the display panel and has extremely little deformation caused by bending.

3. The display device according to claim 2,

there is further provided a second pole facet that,

the second pole face is provided on the impact dispersion layer, and deformation caused by bending is extremely small.

4. The display device according to any one of claim 1 to claim 3,

the impact absorption layer has a rubber hardness of 17 or more and 30 or less.

5. The display device according to any one of claim 1 to claim 4,

the impact absorption layer has a rubber hardness of 17 or more and 24 or less.

6. The display device according to any one of claim 1 to claim 5,

the deformation-relaxation layer has a Young's modulus of 1GPa to 10 GPa.

7. The display device according to any one of claim 1 to claim 6,

the display panel has flexibility.

8. The display device according to any one of claim 1 to claim 7,

the display panel includes an organic electroluminescent element.

9. The display device according to any one of claims 1 to 8,

further comprises a protection component which is arranged on the base,

the protective member faces the impact dispersion layer with the display panel interposed therebetween.

10. The display device according to any one of claims 1 to 9,

the impact dispersion layer is made of tempered glass.

11. The display device according to any one of claim 1 to claim 10,

the deformation mitigating layer contains a resin.

12. The display device according to any one of claim 1 to claim 11,

the impact absorption layer has a storage modulus of 100kPa or less at room temperature.

13. An electronic device is provided with a display device,

the display device includes:

a display panel;

a shock dispersion layer provided on a light extraction side of the display panel and having a Young's modulus of 50GPa or more;

a deformation mitigating layer provided between the impact dispersing layer and the display panel and having a Young's modulus lower than that of the impact dispersing layer; and

and an impact absorbing layer which is provided between the deformation relaxation layer and the display panel and has a storage modulus of 10kPa or more and 1MPa or less at room temperature.

14. An electronic device is provided with a display device,

the display device includes:

a display panel;

a shock dispersion layer provided on a light extraction side of the display panel and having a Young's modulus of 50GPa or more;

a deformation mitigating layer provided between the impact dispersing layer and the display panel and having a Young's modulus lower than that of the impact dispersing layer;

an impact absorbing layer provided between the deformation mitigating layer and the display panel and having a gel-like shape; and

and a first pole face which is provided on the display panel and has extremely little deformation caused by bending.

Background

In recent years, development of flexible displays has been advanced. Flexible displays are characterized by thinness, lightness and flexibility. In such a display device such as a flexible display, in order to improve mechanical strength against an external impact, a method of providing a protective sheet on a display surface has been proposed (for example, see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-24567

Disclosure of Invention

In a display device provided with such a protective sheet, it is desirable to suppress a decrease in bendability. Accordingly, it is desirable to provide a display device and an electronic apparatus in which a decrease in bendability can be suppressed.

A display device (1) according to one embodiment of the present technology includes a display panel, an impact dispersion layer, a deformation relaxation layer, and an impact absorption layer. The impact dispersion layer is provided on the light extraction side of the display panel, and has a Young's modulus of 50GPa or more. The deformation mitigating layer is provided between the impact dispersing layer and the display panel, and has a Young's modulus lower than that of the impact dispersing layer. The impact absorbing layer is provided between the deformation mitigating layer and the display panel, and has a storage modulus of 10kPa or more and 1MPa or less at room temperature.

An electronic device (1) according to an embodiment of the present technology is provided with the display device (1) according to an embodiment of the present technology described above.

In the display device (1) and the electronic apparatus (1) according to the embodiment of the present technology, the impact absorbing layer has a storage modulus of 10kPa or more and 1MPa or less at room temperature, and therefore a surface with extremely small deformation due to bending is easily formed in the display panel.

A display device (2) according to one embodiment of the present technology includes a display panel, an impact dispersion layer, a deformation relaxation layer, an impact absorption layer, and a first pole face. The impact dispersion layer is provided on the light extraction side of the display panel, and has a Young's modulus of 50GPa or more. The deformation mitigating layer is provided between the impact dispersing layer and the display panel, and has a Young's modulus lower than that of the impact dispersing layer. The shock absorbing layer is provided between the deformation alleviating layer and the display panel and is in a gel state. The first pole face is provided on the display panel, and deformation caused by bending is extremely small.

An electronic device (2) according to an embodiment of the present technology is provided with the display device (2) according to an embodiment of the present technology.

In the display device (2) and the electronic apparatus (2) according to the embodiment of the present technology, since the first pole face having extremely small deformation due to bending is provided on the display panel, stress applied to the display panel when the display device is bent is reduced.

According to the display device (1) and the electronic apparatus (1) of the embodiment of the present technology, the impact absorbing layer has a storage modulus of 10kPa or more and 1MPa or less at room temperature, and further, according to the display device (2) and the electronic apparatus (2) of the embodiment of the present technology, the first extremely small surface whose deformation due to bending is extremely small is provided on the display panel, so that stress applied to the display panel when the display device is bent can be reduced. Therefore, the reduction of the bendability can be suppressed.

The present invention is not limited to the effects described herein, and any one of the effects described in the present disclosure may be used.

Drawings

Fig. 1 is a schematic cross-sectional view of a schematic configuration example of a display device according to an embodiment of the present technology.

Fig. 2 is a schematic cross-sectional view of an example of the structure of the display panel shown in fig. 1.

Fig. 3 is a schematic cross-sectional view of the structure of a display device of a comparative example.

Fig. 4 shows the magnitude of deformation occurring when the display device shown in fig. 3 is bent.

Fig. 5 shows the magnitude of deformation occurring when the display device shown in fig. 1 is bent.

Fig. 6 is a graph showing the relationship between the rubber hardness of the impact absorbing layer shown in fig. 1 and the impact resistance of the protective sheet.

Fig. 7 is a schematic cross-sectional view of a schematic configuration example of a display device of a modification.

Fig. 8 is a block diagram showing a schematic configuration example of the display device shown in fig. 1 and the like.

Fig. 9 is a block diagram showing a schematic configuration example of an electronic device including the display device shown in fig. 8.

Description of the symbols

1. 1A display device

3 electronic device

10 display panel

11 substrate

12 UC film

13 display element layer

14 sealing film

15 polarizing plate

20 protective sheet

21 impact absorbing layer

22 deformation mitigating layer

23 impact dispersing layer

25 timing control part

26 Signal processing part

27 drive part

28 display pixel part

30 interface part

50 protective member

100 display device

120 protective sheet

121 shock absorbing layer

S1 first side

S2 second side

Detailed Description

Embodiments for carrying out the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below all represent preferred specific examples of the present invention. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the components of the following embodiments, components that are not recited in the independent claims indicating the uppermost concept of the present invention will be described as arbitrary components. Each drawing is a schematic diagram, and the illustration is not necessarily strict. In the drawings, substantially the same components are denoted by the same reference numerals, and redundant description is omitted or simplified. The following description is made in the order described below.

1. Embodiment mode (example of display device having protective sheet provided on light extraction surface of display panel)

2. Modification (example having a protective member on the surface opposite to the light extraction surface of the display panel)

3. Application example 1 (example of display device)

4. Application example 2 (example of electronic device)

< 1> embodiment >

[ Structure ]

Fig. 1 schematically shows an example of a cross-sectional structure of a display device 1 according to an embodiment of the present disclosure. The display device 1 is suitable for a display that can be bent, that is, a flexible display, for example. The display device 1 includes: a display panel 10 having a first face S1 and a second face S2, and a protect sheet 20 disposed on the first face S1 of the display panel 10. The first surface S1 is a light extraction surface of the display panel 10, and the second surface S2 faces the first surface S1. Protective sheet 20 includes impact absorbing layer 21, deformation mitigating layer 22, and impact dispersing layer 23 in this order from the side of display panel 10 (first surface S1). For example, the display device 1 includes a controller that controls the display panel 10, and controls the display panel 10 in accordance with a control signal from the controller. The display panel 10 to which the control signal is input generates image light, and the generated image light is taken out from the outside through the first face S1 and the protect sheet 20.

(display panel 10)

Fig. 2 schematically shows an example of the cross-sectional structure of the display panel 10. The display panel 10 is, for example, a top emission type organic el (electroluminescence) panel, and includes a substrate 11, a uc (under coat) film 12, a display element layer 13, a sealing film 14, and a polarizing plate 15 in this order. The first surface S1 of the display panel 10 is disposed on the polarizing plate 15 side, and the second surface S2 is disposed on the substrate 11 side. The display panel 10 is flexible (flexible), for example.

The substrate 11 is, for example, a flexible substrate and is made of a resin material such as PI (polyimide). The substrate 11 may be made of glass, metal, or the like. The substrate 11 may be made of a resin material such as polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), polyvinyl phenol (PVP), polyether sulfone (PES), Polycarbonate (PC), polyethylene terephthalate (PET), or triacetyl cellulose (TAC). The substrate 11 may be a film or a sheet.

The UC film 12 provided between the substrate 11 and the display element layer 13 prevents substances such as sodium ions from moving from the substrate 11 to an upper layer (the display element layer 13 and the like), and is made of an insulating material such as a silicon nitride (SiN) film or a silicon oxide (SiO) film. For example, the UC film 12 may be a laminated film in which a silicon nitride (SiN) film and a silicon oxide (SiO) film are laminated in this order from a position close to the substrate 11. The UC film 12 is provided, for example, on the entire surface of the substrate 11.

For example, a Thin Film Transistor (TFT) (not shown) is provided between the UC Film 12 and the display element layer 13. The thin film transistor is, for example, a top gate type, a bottom gate type, or a double gate type thin film transistor, and has a semiconductor layer in a selective region on the substrate 11. The semiconductor layer includes a channel region (active layer), and is composed of an oxide semiconductor containing, as a main component, an oxide of at least 1 element of indium (In), gallium (Ga), zinc (Zn), tin (Sn), titanium (Ti), niobium (Nb), and the like. Specifically, examples of the oxide semiconductor include: indium Tin Zinc Oxide (ITZO), indium gallium zinc oxide (IGZO: InGaZnO), zinc oxide (ZnO), Indium Zinc Oxide (IZO), Indium Gallium Oxide (IGO), Indium Tin Oxide (ITO), indium oxide (InO), and the like. The semiconductor layer may be formed of Low Temperature Polysilicon (LTPS) or amorphous silicon (a-Si).

The display element layer 13 provided between the substrate 11 and the polarizing plate 15 includes a plurality of pixels, and includes an organic electroluminescence element (organic EL element) that is display-driven by a backplane in which a plurality of thin film transistors described above are arranged. The organic EL element has, for example, an anode electrode, an organic layer including a light-emitting layer, and a cathode electrode in this order from the UC film 12 side. The anode electrode is connected to, for example, source and drain electrodes of the thin film transistor. The cathode electrode is supplied with a cathode potential common to the respective pixels, for example, via a wire or the like. In the organic EL element, a hole injection layer and a hole transport layer may be provided between the anode electrode and the light-emitting layer in this order from the anode electrode side. In the organic EL element, an electron injection layer and an electron transport layer may be provided in this order from the cathode electrode side between the cathode electrode and the light-emitting layer.

The sealing film 14 on the display element layer 13 covers the end of the display element layer 13, and is in contact with the UC film 12. That is, the display element layer 13 is sealed between the sealing film 14 and the substrate 11. The sealing film 14 plays a role of resisting intrusion of moisture or the like into the display element layer 13 from the outside. The sealing film 14 is made of, for example, silicon oxide (SiO)_x) Silicon nitride (SiN)_x) Silicon oxynitride (SiON) and aluminum oxide (AlO). The sealing film 14 may be formed by alternately stacking 3 or more layers of such inorganic material and organic material.

The polarizing plate 15 provided on the sealing film 14 faces the substrate 11 through the display element layer 13. The polarizing plate 15 is, for example, a circular polarizing plate, and functions to suppress reflection of external light incident on the display panel 10.

(protective sheet 20)

The protect sheet 20 protects the first face S1 of the display panel 10. By providing the protective sheet 20 having the following impact absorbing layer 21, deformation relaxing layer 22, and impact dispersing layer 23, the scratch resistance and impact resistance of the display device 1 can be improved.

The impact dispersion layer 23 is provided, for example, at a position farthest from the first surface S1 of the display panel 10 in the protective sheet 20. The impact dispersion layer 23 has: a function of dispersing an impact applied from the outside so as not to be concentrated on one point, and a function of preventing surface damage due to scratching or the like. The impact dispersion layer 23 has a Young's modulus of 50GPa or more. The impact dispersion layer 23 has a Young's modulus of, for example, 60GPa to 70 GPa. Such an impact dispersion layer 23 is made of, for example, a reinforced glass having flexibility. For example, impact dispersion layer 23 is made of tempered glass having a thickness of 30 μm or more and 100 μm or less.

The deformation relaxation layer 22 provided between the impact dispersion layer 23 and the impact absorption layer 21 is for improving the crack resistance of the impact dispersion layer 23, and has a young's modulus lower than that of the impact dispersion layer 23. For example, the deformation mitigating layer 22 has a young's modulus of 1GPa to 10 GPa. Even in the case of using a highly bending-resistant member for the impact dispersion layer 23, if the impact absorption layer 21 having a very soft lower layer is provided, the impact dispersion layer 23 may be greatly deflected by a load, thereby causing a fracture beyond a bending breaking strain. By providing the deformation mitigating layer 22 as described above between the impact dispersing layer 23 and the impact absorbing layer 21, the crack resistance of the impact dispersing layer 23 can be improved.

The deformation relaxation layer 22 is made of, for example, a curable transparent resin layer having higher bending strength and tensile strength than those of the impact dispersion layer 23. The curable transparent resin layer is made of, for example, a wet laminate or a dry laminate which is provided in close contact with the impact dispersion layer 23. The wet laminate is formed, for example, by coating an energy curable resin (e.g., a UV curable resin) on the impact dispersion layer 23 and then curing. The dry laminate is formed by, for example, laminating a resin film on the impact dispersion layer 23.

The thickness of the deformation-relaxing layer 22 is, for example, 10 μm or more and 100 μm or less. By setting the thickness of the deformation-mitigating layer 22 to 10 μm or more, it becomes easy to cover the fine irregularities on the surface of the impact-dispersing layer 23. By setting the thickness of the deformation-mitigating layer 22 to 100 μm or less, the flexibility of the protective sheet 20 is easily maintained.

The shock absorbing layer 21 provided between the deformation alleviating layer 22 and the display panel 10 (the first surface S1) is in the form of a gel, and deforms in response to bending of the shock dispersing layer 23 when the shock dispersing layer 23 receives a shock. Thus, the impact applied to the impact dispersion layer 23 is absorbed by the impact absorption layer 21, and the influence on the display panel 10 due to the impact can be suppressed.

In the present embodiment, the gel-like impact absorbing layer 21 has a storage modulus of 10kPa or more and 1MPa or less at room temperature. As a result, a surface (a pole face λ 2 in fig. 5 described later) with extremely small deformation due to bending is formed on the display panel 10, which will be described later in detail. Therefore, when the display device 1 is bent, stress applied to the display panel 10 can be reduced.

The impact absorbing layer 21 more preferably has a storage modulus of 100kPa or less at room temperature. Thereby, the stress applied to the display panel 10 can be more reduced. Further, the impact absorbing layer 21 has a storage modulus of 10kPa or more at room temperature, and thus easily exhibits impact absorbability. Here, the room temperature is 15 degrees or more and 35 degrees or less. The storage modulus can be determined, for example, using a rotational rheometer.

Such an impact absorbing layer 21 preferably has a rubber hardness of 17 or more and 30 or less. The rubber hardness of the impact absorption layer 21 is more preferably 17 or more and 24 or less. This makes it easy to maintain the impact resistance of protective sheet 20 (see fig. 6 described later). The rubber hardness can be measured by, for example, ASTM D2240 durometer type 00.

The impact absorbing layer 21 is made of, for example, a gel-like resin layer, and specifically, a gel-like adhesive or the like can be used for the impact absorbing layer 21. Such an impact absorbing layer 21 may function to directly or indirectly attach the protective sheet 20 to the first surface S1 of the display panel 10, for example. The impact absorbing layer 21 is composed of a gel-like adhesive such as acrylic. Other gel-like adhesives such as silicone gel may be used for the impact absorbing layer 21. The thickness of the impact absorbing layer 21 is, for example, 100 μm or more and 500 μm or less.

[ actions ]

In the display device 1, each pixel of the display element layer 13 is display-driven in accordance with a video signal inputted from the outside, thereby displaying a video. At this time, for example, the thin film transistor of each pixel is voltage-driven. Specifically, if a voltage equal to or higher than the threshold voltage is supplied to the thin film transistor, the semiconductor layer is activated (a channel is formed), and as a result: a current flows between a pair of source and drain electrodes of the thin film transistor. By voltage driving of the thin film transistor, image display of the display panel 10 is performed. The image light generated in the display panel 10 is taken out to the outside from the first face S1 through the protect sheet 20.

[ action and Effect ]

In the display device 1 of the present embodiment, since the impact absorbing layer 21 has a storage modulus of 10kPa or more and 1MPa or less at room temperature, a surface with extremely small deformation due to bending is easily formed in the display panel 10. Hereinafter, the operation and effect will be described in detail with reference to comparative examples.

Fig. 3 schematically shows a cross-sectional structure of a display device (display device 100) of a comparative example. The display device 100 includes: a display panel 10, and a protective sheet 120 disposed on the first surface S1 of the display panel 10. The protective sheet 120 includes an impact absorbing layer 121, a deformation mitigating layer 22, and an impact dispersing layer 23 in this order from the display panel 10 (first surface S1) side. In this protective sheet 120, the storage modulus of the impact absorbing layer 121 is 10MPa at room temperature. That is, the impact absorbing layer 121 has a storage modulus greater than 1MPa at room temperature. In this regard, protective sheet 120 of display device 100 is different from protective sheet 20 of display device 1.

Fig. 4 shows the result of the relationship between the magnitude of the deformation generated when the display device 100 is bent and the position (coordinates) of the deformation in the stacking direction, which is obtained by simulation. The simulation was performed using texture analysis software that analyzed using a finite element method. The conditions of the simulation are shown in table 1 below. The impact absorbing layer 121 was a superelastic model with a thickness of 100 μm and an elastic modulus of 0.01GPa (10 MPa). The strain-relaxation layer 22 was an elastic-plastic model having a thickness of 30 μm and an elastic modulus of 3 GPa. The impact dispersion layer 23 was an elastic model having a thickness of 100 μm and an elastic modulus of 70 GPa. The seal film 14 was an elastic-plastic model having a thickness of 65 μm and an elastic modulus of 6 GPa. The substrate 11 to the display element layer 13 were an elastic model having a thickness of 40 μm and an elastic modulus of 10 GPa.

[ Table 1]

As is apparent from fig. 4, in the display device 100, the surface (the pole facet λ 1) having the smallest distortion due to bending exists in the impact dispersion layer 23. That is, if the impact absorbing layer 121 having a high storage modulus is used, the extremely small surface λ 1 is formed in the impact dispersing layer 23 having a high young's modulus. The distortion caused by bending in the pole facet λ 1 is substantially 0 (zero).

The young's modulus of the impact dispersion layer 23 is, for example, about 60GPa to 70GPa, which is higher by one order of magnitude or more than the young's modulus of the deformation relaxation layer 22 and the impact absorption layer 121. The high young's modulus of the impact dispersion layer 23 greatly affects the position of the extremely small surface λ 1, and the extremely small surface λ 1 is formed in the impact dispersion layer 23 (fig. 4). In the display device 100, the stress applied to the display panel 10 is likely to increase because the display panel 10 is distant from the polar surface λ 1.

If the display device 100 is bent with a small radius of curvature (radius of curvature R), a large stress is applied to the display panel 10 away from the extremely small surface λ 1, and the thin film transistor, the display element layer 13, the sealing film 14, and the like may be broken due to the stress.

On the other hand, in the display device 1, since the impact absorbing layer 21 has a storage modulus of 10kPa or more and 1MPa or less at room temperature, a surface with extremely small deformation due to bending is easily formed in the display panel 10.

Fig. 5 shows the result of the relationship between the deformation generated when the display device 1 is bent and the position (coordinates) in the stacking direction, which is obtained by simulation. The simulation is the same as the simulation of the display device 100 (fig. 4) except for the storage modulus of the impact absorbing layer 21. In fig. 5, the simulation was performed with the storage modulus of the impact absorbing layer 21 being 30 kPa.

In this manner, by using the impact absorbing layer 21 having a low storage modulus, stress in the impact absorbing layer 21 is relaxed, and therefore, a surface having extremely small deformation (extremely small surface λ 2) is also formed in the display panel 10. That is, in the display device 1, there are a polar facet λ 1 and a polar facet λ 2, the polar facet λ 1 is present in the impact dispersion layer 23, and the polar facet λ 2 faces the polar facet λ 1 with the impact absorption layer 21 interposed therebetween. Although the distortion caused by bending is substantially 0 (zero) in the pole facet λ 2, a minute distortion may be generated in the pole facet λ 2 within a range in which the effect of the present disclosure can be obtained. By forming the pole facet λ 2 in the display panel 10, the stress applied to the thin film transistor, the display element layer 13, the sealing film 14, and the like of the display panel 10 is reduced in the display device 1 as compared with the display device 100. Therefore, even if the display device 1 is bent with a small radius of curvature, breakage of the display panel 10 can be suppressed. Here, the pole facet λ 2 corresponds to a specific example of "first pole facet" of the present disclosure, and the pole facet λ 1 corresponds to a specific example of "second pole facet" of the present disclosure.

In addition, the impact absorbing layer 21 preferably has a rubber hardness of 17 or more and 30 or less. This makes it easy to maintain the impact resistance of the protective sheet 20. The impact resistance of the protective sheet 20 will be described below.

As described above, in the protective sheet 20, by providing the impact absorbing layer 21 with a storage modulus of 10kPa or more and 1MPa or less at room temperature, stress applied to the display panel 10 when the display device 1 is bent can be reduced. On the other hand, as the storage modulus of the impact absorbing layer 21 becomes lower, the impact absorbing layer 21 is likely to be broken when an impact is applied from the outside, and therefore, it is not easy to maintain the impact resistance of the protective sheet 20.

Fig. 6 shows the relationship between the rubber hardness and the impact resistance of the impact absorbing layer 21. The impact resistance was determined by a ball drop test with a weight of 30g, and was represented by the height of a ball drop when the display panel 10 was broken. Rubber hardness was determined by ASTM D2240 durometer type 00.

As is clear from fig. 6, as the rubber hardness of the impact absorbing layer 21 becomes higher, the impact resistance of the display device 1 is improved. When the rubber hardness of the impact absorption layer 21 is 18 or more and 24 or less, the impact resistance of the display device 1 is substantially flat. On the other hand, when the impact absorption layer 21 having a rubber hardness of 42 is used, the impact absorbability is rather lowered. If the rubber hardness of the impact absorbing layer 21 is 17 or more and 30 or less, the impact is absorbed by the impact absorbing layer 21, and sufficient impact resistance can be maintained. Further, if the rubber hardness of the impact absorbing layer 21 is too high, the impact absorbing layer 21 is not easily deformed, and the protective sheet 20 does not easily absorb an impact. Therefore, by providing the impact absorbing layer 21 with a rubber hardness of 17 to 30 inclusive, the impact resistance of the protective sheet 20 can be easily maintained. The rubber hardness of the impact absorbing layer 21 is more preferably 17 or more and 24 or less, so that high impact resistance of the protective sheet 20 can be obtained.

In the present embodiment as described above, since the impact absorbing layer 21 has a storage modulus of 10kPa or more and 1MPa or less at room temperature, stress applied to the display panel 10 can be reduced when the display device 1 is bent. Therefore, the reduction of the bendability can be suppressed.

Further, by providing the impact absorbing layer 21 with rubber hardness of 17 to 30 inclusive, the impact resistance of the protective sheet 20 can be easily maintained.

Hereinafter, a modified example of the present embodiment will be described, and in the following description, the same components as those of the above embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

<2. modification >

Fig. 7 schematically shows a cross-sectional structure of a display device (display device 1A) according to a modification of the above embodiment. In the display device 1A, a protective member (protective member 50) is provided on the second surface S2 of the display panel 10. Except for this point, the display device 1A has the same configuration as the display device 1 of the above embodiment, and the operation and effect thereof are also the same.

The protective member 50 facing the protective sheet 20 with the display panel 10 interposed therebetween is, for example, a plate-like member that protects the second surface S2 side of the display panel 10. By providing the protective member 50, the rigidity of the display device 1A is improved, and the occurrence of local bending of the display panel 10 when the display panel 10 receives an impact can be suppressed.

The protective member 50 is preferably made of a material having a high young's modulus and being not easily plastically deformed. As a constituent material of the protective member 50, for example, a metal material such as 42 alloy (42Ni — Fe), sus (steel Use stainless), magnesium (Mg) alloy, aluminum (Al), or the like can be used. By constituting the protective member 50 of a metal material, heat can be efficiently dissipated from the second surface S2 of the display panel 10. The protective member 50 may be made of a resin material such as PET (polyethylene terephthalate). The rigidity of protective member 50 may be substantially the same as the rigidity of protective sheet 20.

<3 > application example 1>

An application example (application example) of an electronic device to which the display devices 1 and 1A of the above embodiments and modifications are applied will be described.

First, a module configuration example of the display device 1 is explained.

[ example of Module Structure of display device 1]

Fig. 8 is a schematic block diagram showing a schematic configuration example of the apparatuses 1, 1A. The display device 1,1A displays a video signal inputted from the outside or a video signal generated inside in the form of a video, and is also applicable to, for example, a liquid crystal display, etc., in addition to the organic EL display described above. The display device 1,1A includes, for example, a timing control unit 25, a signal processing unit 26, a driving unit 27, and a display pixel unit 28.

The timing control section 25 has a timing generator that generates various timing signals (control signals), and performs drive control of the signal processing section 26 and the like based on these timing signals.

The signal processing unit 26 performs predetermined correction on, for example, a digital video signal inputted from the outside, and outputs the video signal obtained thereby to the driving unit 27.

The driving section 27 is configured to include, for example, a scanning line driving circuit, a signal line driving circuit, and the like, and drives each pixel of the display pixel section 28 through various control lines.

The display pixel section 28 is configured to include a display element (the display element layer 13 described above) such as an organic EL element or a liquid crystal display element, and a pixel circuit for driving the display element so as to drive each pixel.

<4 > application example 2>

[ example of electronic device Structure ]

The display devices 1 and 1A described in the above embodiments and modifications can be applied to various types of electronic apparatuses.

Fig. 9 is a block diagram of an application example of an electronic device (electronic device 3) including the display devices 1 and 1A shown in fig. 8. As such an electronic device 3, there are listed: such as televisions, Personal Computers (PCs), smart phones, tablet PCs, cell phones, digital cameras, digital video cameras, and the like.

The electronic device 3 includes, for example, the display devices 1 and 1A and the interface unit 30. The interface unit 30 is an input unit to which various signals and power supplies from the outside are input. The interface unit 30 may further include a user interface such as a touch panel, a keyboard, or a manipulation button.

Although the technology of the present disclosure has been described above by way of examples of the embodiments and modifications, the technology is not limited to these embodiments and the like, and various changes may be made.

For example, the material and thickness of each layer described in the above embodiments and the like are not limited to those listed, and other materials and thicknesses may be used. In addition, the display device may not necessarily include all of the layers described above, or may further include other layers in addition to the layers described above.

In the above-described embodiments and the like, the case where the display element layer 13 includes the organic EL element has been described, but the display element layer 13 may include another display element such as a liquid crystal display element.

Although the case where protective sheet 20 includes 1 impact absorbing layer 21, 1 deformation mitigating layer 22, and 1 impact dispersing layer 23 has been described in the above embodiments and the like, protective sheet 20 may include a plurality of impact absorbing layers 21, a plurality of deformation mitigating layers 22, or a plurality of impact dispersing layers 23.

The effects described in the present specification are merely examples, and are not limited thereto, and other effects may be provided.

In addition, the present technology can also adopt the following configuration.

(1)

A display device is provided with:

a display panel;

a shock dispersion layer provided on a light extraction side of the display panel and having a Young's modulus of 50GPa or more;

a deformation mitigating layer provided between the impact dispersing layer and the display panel and having a Young's modulus lower than that of the impact dispersing layer; and

and an impact absorbing layer which is provided between the deformation relaxation layer and the display panel and has a storage modulus of 10kPa or more and 1MPa or less at room temperature.

(2)

A display device is provided with:

a display panel;

a shock dispersion layer provided on a light extraction side of the display panel and having a Young's modulus of 50GPa or more;

a deformation mitigating layer provided between the impact dispersing layer and the display panel and having a Young's modulus lower than that of the impact dispersing layer;

an impact absorbing layer provided between the deformation mitigating layer and the display panel and having a gel-like shape; and

and a first pole face which is provided on the display panel and has extremely little deformation caused by bending.

(3)

The display device of (2) above, wherein,

there is further provided a second pole facet that,

the second pole face is provided on the impact dispersion layer, and deformation caused by bending is extremely small.

(4)

The display device of any one of the (1) to (3), wherein,

the impact absorption layer has a rubber hardness of 17 or more and 30 or less.

(5)

The display device of any one of the (1) to (4), wherein,

the impact absorption layer has a rubber hardness of 17 or more and 24 or less.

(6)

The display device of any one of the (1) to (5), wherein,

the deformation-relaxation layer has a Young's modulus of 1GPa to 10 GPa.

(7)

The display device of any one of the (1) to (6), wherein,

the display panel has flexibility.

(8)

The display device of any one of the (1) to (7), wherein,

the display panel includes an organic electroluminescent element.

(9)

The display device of any one of the (1) to (8), wherein,

further comprises a protection component which is arranged on the base,

the protective member faces the impact dispersion layer with the display panel interposed therebetween.

(10)

The display device of any one of the (1) to (9), wherein,

the impact dispersion layer is made of tempered glass.

(11)

The display device of any one of the (1) to (10), wherein,

the deformation mitigating layer contains a resin.

(12)

The display device of any one of the (1) to (11), wherein,

the impact absorption layer has a storage modulus of 100kPa or less at room temperature.

(13)

An electronic device is provided with a display device,

the display device includes:

a display panel;

a shock dispersion layer provided on a light extraction side of the display panel and having a Young's modulus of 50GPa or more;

a deformation mitigating layer provided between the impact dispersing layer and the display panel and having a Young's modulus lower than that of the impact dispersing layer; and

and an impact absorbing layer which is provided between the deformation relaxation layer and the display panel and has a storage modulus of 10kPa or more and 1MPa or less at room temperature.

(14)

An electronic device is provided with a display device,

the display device includes:

a display panel;

a shock dispersion layer provided on a light extraction side of the display panel and having a Young's modulus of 50GPa or more;

a deformation mitigating layer provided between the impact dispersing layer and the display panel and having a Young's modulus lower than that of the impact dispersing layer;

an impact absorbing layer provided between the deformation mitigating layer and the display panel and having a gel-like shape; and

and a first pole face which is provided on the display panel and has extremely little deformation caused by bending.

The present disclosure contains subject matter relating to the disclosure in japanese priority patent application JP2020-045591 filed at the japanese patent office on 3/16/2020, which is incorporated herein by reference in its entirety.

It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible in light of design requirements and other factors, but are intended to be included within the scope of the appended claims or their equivalents.