CN112838113B

CN112838113B - Display device

Info

Publication number: CN112838113B
Application number: CN202110087554.XA
Authority: CN
Inventors: 陈慧
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2023-05-09
Anticipated expiration: 2041-01-22
Also published as: CN112838113A

Abstract

The embodiment of the application discloses display device, display device includes display panel and sets up in display panel's play optical side's reflection stratum, the reflection stratum has whole or partial filtering effect to the light of predetermineeing the wavelength, and the reflection stratum is used for the incident to display panel's ambient light filters. The display device can filter out UV light or sunlight entering the display panel and allow the light emitted by the display panel to penetrate, so that damage of UV illumination to a light emitting device or a light emitting material can be reduced under the condition that the light emitting effect of the display panel is not affected.

Description

Display device

Technical Field

The application relates to the technical field of display, in particular to a display device.

Background

The luminous material in the OLED device can be attenuated in brightness and service life after being subjected to Ultraviolet (UV) light or sunlight illumination, and the polaroid in the traditional OLED device architecture has the function of blocking the UV light to a certain extent, but still damages the OLED device, so that the brightness and the chromaticity of the full-module screen in a lighting state are changed, and the service life of the device is influenced.

Although the polarizing layer has a blocking effect against UV light of 400nm or less, damage of the light emitting material by UV light cannot be prevented, and thus the transmittance of UV light should be further reduced. Meanwhile, in order not to affect the display brightness of the display panel, it is required to ensure high transmittance of light of 440nm or more.

In the course of research and practice of the prior art, the applicant of the present application has studied a display device to solve the above technical problems.

Content of the application

The embodiment of the application provides a display panel and a display device, which can filter UV light or sunlight and allow the light emitted by the display panel to permeate, so that the damage of the UV light to a light emitting device can be reduced under the condition that the light emitting effect of the display panel is not affected.

The embodiment of the application provides a display device, which comprises a display panel, and further comprises a reflecting layer, wherein the reflecting layer is arranged on the light emitting side of the display panel, and the reflecting layer has full or partial filtering effect on light rays with preset wavelengths; and, the reflecting layer is used for filtering the ambient light incident to the display panel.

Optionally, in some embodiments of the present application, the preset wavelength is less than 400 nanometers.

Optionally, in some embodiments of the present application, the reflective layer includes a plurality of first sub-layers and a plurality of second sub-layers, wherein the first sub-layers and the second sub-layers are alternately stacked in sequence, and a refractive index of the first sub-layer is greater than a refractive index of the second sub-layer.

Optionally, in some embodiments of the present application, the first layer and the second layer are both inorganic layers.

Optionally, in some embodiments of the present application, a material of each of the first layers is SiN ₄ Or TiO ₂ At least one of (a) and (b); each of the second layered materials is SiO ₂ 、SiN ₄ Or TiO ₂ At least one of them.

Alternatively, in some embodiments of the present application, the number of layers of the layering of the reflective layer ranges from 6 to 8 layers.

Optionally, in some embodiments of the present application, the display device further includes a touch layer, where the touch layer is disposed on a light emitting side of the display panel and includes a plurality of insulating layers, and one or more of the plurality of insulating layers is disposed as the reflective layer.

Optionally, in some embodiments of the present application, the touch layer further includes an electrode bridge point and a touch electrode, and the multiple insulating layers include a first insulating layer, a second insulating layer, and a third insulating layer that are sequentially stacked; providing at least one of the first insulating layer, the second insulating layer, and the third insulating layer as the reflective layer; the touch electrode is arranged between the first insulating layer and the second insulating layer, and the electrode bridge point is arranged between the second insulating layer and the third insulating layer; and the second insulating layer is provided with a connecting hole corresponding to the electrode bridge point position, and the touch electrode comprises a transmitting electrode and a receiving electrode, wherein the transmitting electrode or the receiving electrode are connected with each other through the connecting hole and the electrode bridge point at the position corresponding to the connecting hole.

Optionally, in some embodiments of the present application, the display device further includes a cover plate, the cover plate is disposed on a light emitting side of the display panel, and the reflective layer is disposed on a surface of the cover plate facing or away from the display panel.

Optionally, in some embodiments of the present application, the display panel further includes a polarizing layer disposed between the display panel and the cover plate.

The embodiment of the application adopts the reflective layer arranged on the light emitting side of the display panel, and can block the light with the preset wavelength range under the condition of not changing the framework of the existing display device, so that the damage of UV illumination to the light emitting device in the display panel can be reduced under the condition of not affecting the transmittance of the light emitting wave band. In addition, the insulating layer in the touch control layer is multiplexed into the reflecting layer, so that the manufacturing process of the display panel can be reduced while the original functions of the display panel are not affected. Finally, the display device can solve the problem that the brightness and the chromaticity of the full module screen in the lighting state change caused by UV light or sunlight.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a first embodiment of a display device according to an embodiment of the present application, in which a reflective layer is disposed in a touch layer.

Fig. 2 is an embodiment of the reflective layer of fig. 1 provided in an embodiment of the present application.

Fig. 3 is a transmission spectrum of the reflective layer in fig. 2 according to an embodiment of the present application.

Fig. 4 is a first embodiment of the touch layer in fig. 1 according to an embodiment of the present application.

Fig. 5 is a second embodiment of the touch layer in fig. 1 according to an embodiment of the present application.

Fig. 6 is a third embodiment of the touch layer in fig. 1 according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a second embodiment of a display device according to an embodiment of the present application, in which a reflective layer is disposed on a cover plate.

Reference numerals illustrate:

100. display device 10 display panel

11. Substrate 12 light emitting device layer

13. Encapsulation layer 20 touch layer

30. Polarizing layer 40 cover plate

50. First insulating layer of back plate 21

22. Second insulating layer of touch electrode 23

24. Electrode bridge point 25 third insulating layer

222. Receiving electrode 221 transmitting electrode

231. Light emitting device with connection hole 121

1. First delamination of the reflective layer 101

102. Second layering

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.

The embodiment of the application provides a display device. The following will describe in detail. The following description of the embodiments is not intended to limit the preferred embodiments.

As shown in fig. 1, the display device 100 includes a display panel 10, and a reflective layer 1 (not shown in fig. 1) disposed on a light emitting side of the display panel 10, where the reflective layer 1 can filter light of a predetermined wavelength.

And, when the ambient light or the sunlight is incident on the display panel 10 through the reflective layer 1, the reflective layer 1 may filter the ambient light or the sunlight to filter the light of the preset wavelength in the ambient light or the sunlight.

Specifically, the value range of the preset wavelength is smaller than 400 nanometers. In other words, the reflective layer 1 can cut off light with a wavelength less than or equal to 400nm, and allow light with a wavelength greater than or equal to 400nm to pass through.

Further, it is known that the wavelength range of the UV light is 10nm to 400nm, and the light emission band of the display panel 10 is generally 400nm or more. As can be seen from fig. 3, the reflective layer 1 does not affect the light transmission of the display panel 10 while blocking the UV light.

It is apparent that the reflective layer 1 can filter out ambient light or UV light in sunlight and allow the emitted light of the display panel 10 to pass through, so that the reflective layer 1 can reduce damage of UV light to the display panel 10 while not affecting the transmittance of the light emitting band of the display panel 10, and finally can reduce the influence of the sunlight or UV light on the brightness, chromaticity and lifetime of the light emitting device of the display panel.

For example, the display panel 10 is an OLED (organic light-Emitting Diode) display panel. At this time, the wavelength of blue light emitted from the blue light emitting device of the OLED display panel is 440nm to 470nm. Referring to fig. 3, the blue light of the blue light emitting device can exit through the reflective layer 1, and the transmittance of the blue light reaches 80%.

As a preferred embodiment, the reflective layer 1 is configured as a distributed bragg reflector (Distributed Bragg Reflector, DBR for short) structure.

Referring to fig. 2, an embodiment of the present application provides an implementation structure of a reflective layer 1. As shown in fig. 2, the reflective layer 1 includes a plurality of first sub-layers 101 and a plurality of second sub-layers 102.

Referring further to fig. 2, the first layer 101 and the second layer 102 are alternately stacked in sequence. That is, two sides of the first layer 101 in the thickness direction are respectively a second layer 102, and correspondingly, two sides of the second layer 102 in the thickness direction are respectively a first layer 101.

Wherein the refractive index of the first layer 101 is greater than the refractive index of the second layer 102.

Specifically, the materials of each of the first layers 101 and each of the second layers 102 are respectively and independently inorganic materials. That is, the first layer 101 and the second layer 102 are inorganic layers, respectively.

In the present embodiment, the material of each first layer 101 is SiN ₄ Or TiO ₂ Each of the second layers 102 is formed of a material that is independently SiO ₂ 、SiN ₄ Or TiO ₂ At least one of them.

In specific implementation, the number of layers of the reflective layer 1 is about 6 to 8. That is, the sum of the numbers of the first and

second layers

101 and 102 is 6 to 8.

In specific implementation, the range or transmittance of the wavelength band that can be cut off of the reflective layer 1 may be adjusted according to the refractive index, thickness or number of layers passing through the first layer 101 or/and the second layer 102.

Further, the process of fabricating the reflective layer 1 in the present application may be completed in the same chamber, which includes a chemical vapor deposition (Chemical Vapor Deposition, CVD) chamber, an Atomic Layer Deposition (ALD) chamber, and a physical vapor deposition (Physical Vapor Deposition, PVD) chamber.

The reflective layer 1 may be disposed in the display device 100 alone, or may be obtained by configuring an existing insulating layer in the display device 100. In this regard, the display device 100 described herein can reduce the number of processes without affecting the original functions of the functional layers in the display device 100.

The arrangement of the reflective layer 1 in the display device 100 according to the present application will be described below in conjunction with the structure of the display device 100.

As shown in fig. 1, the display device 100 includes a display panel 10 and a touch layer 20.

With continued reference to fig. 1, the display panel 10 includes a substrate 11, a light emitting device layer 12, and an encapsulation layer 13.

Specifically, the substrate 11 may be an array substrate. The array substrate may include a substrate and a thin film transistor disposed on the substrate.

In practice, the substrate base may be a rigid substrate such as glass, transparent resin, or the like, or may be a flexible substrate such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate, or glass fiber reinforced plastic, or the like. The thin film transistor can be used for switching or driving a thin film transistor. The type or structure of the thin film transistor is not limited in the present application, and may be modified or selected according to actual display requirements.

With continued reference to fig. 1, the light emitting device layer 12 is disposed on the substrate 11 and includes a plurality of light emitting devices 121. Specifically, the light emitting device 121 is an OLED device. For example, in a specific implementation, the light emitting device 121 may be at least one of a red light emitting device, a blue light emitting device, a green light emitting device, or a white light emitting device.

Specifically, the light emitting device 121 includes an anode, a light emitting material layer, and a cathode. In other embodiments, the light emitting device 121 may further include an organic functional layer disposed between the light emitting material layer and the anode or the cathode. The organic functional layer may be at least one or more of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, or an electron injection layer.

Wherein the luminescent material layer material is an organic luminescent material. The display device 100 of the present application can cut off UV light or sunlight irradiated to the luminescent material layer by providing the reflective layer 1, thereby preventing the luminescent material layer from being subjected to UV light or sunlight, and then the luminescent material layer from being subjected to degradation of brightness and lifetime, and prolonging the service life of the light emitting device 121.

Therefore, the influence of the sun light or UV light on the lifetime of the light emitting device 121 can be reduced by the filtering effect of the reflective layer 1, and thus the influence of the sun light or UV light on the luminance and chromaticity of the display panel can be reduced. Meanwhile, due to the transmittance of the reflective layer 1 to the light emitting band of the light emitting device 121, the reflective layer 1 does not affect the light emitting effect and the display effect of the display panel 10.

As shown in fig. 1, the encapsulation layer 13 is disposed on the light emitting device layer 12 and covers the light emitting device layer 12 and the substrate 11, thereby preventing penetration of moisture or other external contaminants into the substrate 11 and the light emitting device layer 12.

Specifically, the encapsulation layer 13 includes a plurality of inorganic encapsulation layers and organic encapsulation layers that are alternately stacked.

As a preferred embodiment, the encapsulation layer 13 includes a first inorganic encapsulation layer and a second inorganic encapsulation layer, and an organic encapsulation layer disposed between the first inorganic encapsulation layer and the second inorganic encapsulation layer, wherein the first inorganic encapsulation layer is disposed on the light emitting device layer 12.

As shown in fig. 1, the touch layer 20 is disposed on a side of the encapsulation layer 13 away from the substrate 11, and the reflective layer 1 is disposed in the touch layer 20.

The touch layer 20 includes a plurality of insulating layers, and the reflective layer 1 includes one or more of the plurality of insulating layers. That is, one or more of the plurality of insulating layers are provided as the reflective layer 1. With this arrangement, the thickness of the display device 100 can be prevented from being increased while the function of blocking UV light is achieved, and the process of manufacturing the display device 100 can be reduced without affecting the original function of the touch layer 20.

Fig. 4 is a first embodiment of the touch layer in fig. 1 provided in an embodiment of the present application, fig. 5 is a second embodiment of the touch layer in fig. 1 provided in an embodiment of the present application, and fig. 6 is a third embodiment of the touch layer in fig. 1 provided in an embodiment of the present application.

Referring to fig. 4, 5 and 6, the touch layer 20 further includes a touch electrode 22 and an electrode bridge point 24. Accordingly, the multi-layered insulating layer includes a first insulating layer 21, a second insulating layer 23, and a third insulating layer 25, which are sequentially stacked.

With continued reference to fig. 4, 5 and 6, the first insulating layer 21, the second insulating layer 23 and the third insulating layer 25 may be sequentially stacked on the encapsulation layer 13.

With continued reference to fig. 4, 5 and 6, the touch electrode 22 is disposed between the first insulating layer 21 and the second insulating layer 23, and the touch electrode 22 includes a transmitting electrode 221 and a receiving electrode 222.

In a specific implementation, the transmitting electrode 221 and the receiving electrode 222 each independently adopts a Metal mesh structure (Metal mesh). By adopting the touch electrode 22 with a metal grid structure with smaller resistance, the resistance-capacitance delay can be reduced, and the signal transmission speed of the touch electrode 22 can be improved.

With continued reference to fig. 4, 5 and 6, the electrode bridge point 24 is disposed between the second insulating layer 23 and the third insulating layer 25. The second insulating layer 23 is provided with a connection hole 231 corresponding to the electrode bridge point 24, and the transmitting electrodes 221 or the receiving electrodes 222 are connected by the connection hole 231 and the electrode bridge point 24 corresponding to the connection hole 231.

In the present embodiment, two connection holes 231 are prepared at positions of the second insulating layer 23 corresponding to the electrode bridge points 24 or the touch electrodes 22, and the two connection holes 231 are located at opposite sides of the electrode bridge points 24, respectively. Of course, in other embodiments, three or even more of the electrode bridge points 24 may be prepared.

Specifically, the connection hole 231 is filled with a conductive material and the connection between the touch electrode 22 and the electrode bridge point 24 is achieved through the conductive material. In this embodiment, the connection hole 231 may be filled with a material for preparing the electrode bridge point 24 in the process of preparing the subsequent electrode bridge point 24, that is, the material of the electrode bridge point 24 filled in the connection hole 231 realizes the connection between the touch electrode 22 and the electrode bridge point 24, and the preparation method is simple, convenient and easy to operate; in other embodiments, the connection hole 231 may be filled separately, that is, the conductive material of the connection hole 231 may be different from the material of the electrode bridge point 24, and may be set appropriately according to needs.

Referring to fig. 4, fig. 5, and fig. 6, the implementation of the present application further specifically provides three embodiments in which the reflective layer 1 is disposed in the touch layer 20, and the main difference between the three embodiments is that the reflective layer 1 is a different insulating layer in the touch layer 20.

As shown in fig. 4, the first insulating layer 21 may be provided as the reflective layer 1, and the first insulating layer 21 can provide both an insulating effect and a reflective effect. As shown in fig. 5, the second insulating layer 23 may be provided as the reflective layer 1, and the second insulating layer 23 can provide both an insulating effect and a reflective effect. As shown in fig. 6, the third insulating layer 25 may be multiplexed into the reflective layer 1, and the third insulating layer 25 may provide an insulating effect and a reflective effect.

Of course, it should also be noted that in other embodiments, multiple layers of the first insulating layer 21, the second insulating layer 23, or the third insulating layer 25 may also be properly arranged to form the reflective layer 1. For example, the first insulating layer 21 and the second insulating layer 23 may be commonly arranged to obtain the reflective layer 1. That is, the reflective layer 1 includes the first insulating layer 21 and the second insulating layer 23.

As shown in fig. 1, the display device 100 further includes a polarizing layer 30, a cover plate 40, and a back plate 50.

As shown in fig. 1, the polarizing layer 30 is disposed on a side of the touch layer 20 away from the display panel 10. The polarizing layer 30 also has a function of blocking UV light and preventing the UV light from being incident into the display panel 10.

As shown in fig. 1, the cover 40 is disposed on a side of the polarizing layer 30 away from the touch layer 20.

In a specific implementation, the cover 40 is a single-layer or multi-layer laminated structure formed of a transparent glass or other transparent material. For example, the cover 40 can be attached to the polarizing layer 30 by using an optical adhesive layer.

As a preferred embodiment, the cover 40 is a flexible cover. The flexible cover plate comprises a flexible substrate and a hardened film layer laminated on one surface of the flexible substrate. The flexible substrate can be polymer materials such as PI, COP or PET, and the thickness of the flexible substrate is generally not more than 50 mu m, so that the flexible cover plate is ensured to have good bending characteristics. The hardened film layer is a thin film structure deposited on one side of the flexible substrate and typically has a thickness of no more than 10 μm. The strength of the flexible cover plate can be enhanced through the hardened film layer, and the characteristics of falling resistance, wear resistance, water resistance and the like of the flexible cover plate are realized.

As shown in fig. 1, the back plate 50 is disposed on the opposite side of the substrate 11 from the light emitting device layer 12.

Specifically, the back plate 50 may be made of glass, PI or stainless steel, or other materials, which is not specifically limited in the embodiments of the present application. In specific implementation, the back plate 50 can be provided with a heat dissipation pattern or a supporting structure according to the actual structure of the display device, which is not limited in particular in the embodiment of the present application.

For example, in other embodiments of the present disclosure, the display device 100 may further include an example protective layer or other suitable structural or functional layer, as embodiments of the present disclosure are not limited in this regard. It should be noted that the embodiments of the present disclosure are not limited to specific structures and arrangements of, for example, protective layers or other suitable structural layers or functional layers.

As shown in fig. 7, the present embodiment also provides an implementation of the reflective layer 1. Referring to fig. 7 in comparison with fig. 1, the reflective layer 1 in fig. 7 is disposed on a surface of the cover plate 40 facing or away from the display panel 10 in comparison with the embodiment in fig. 1.

In the present embodiment, the reflective layer 1 is disposed on a surface of the cover plate 40 facing the display panel 10. At this time, the polarizing layer 30 is disposed between the reflective layer 1 and the display panel 10.

In other embodiments, the reflective layer 1 may also be disposed on a surface of the cover plate 40 remote from the display panel 10. At this time, the polarizing layer 30 is disposed between the cover plate 40 and the display panel 10.

In a specific implementation, the cover plate 40 may be directly provided by vapor deposition.

The display device 100 described herein can filter out ambient light or UV light in sunlight by providing the reflective layer 1 on the light-emitting side of the display panel 10, prevent UV light from affecting the lifetime of the light emitting device 121, and prevent sunlight from affecting the brightness and chromaticity of the display panel 10. Meanwhile, since the reflective layer 1 allows light of the light emitting device 121 to pass therethrough, the light emitting effect and the display effect of the display apparatus 100 are not affected. Furthermore, the display device 100 of the present application can integrate the reflective layer 1 into the touch layer 20, so that the overall thickness of the display device 100 can be reduced, and the manufacturing process of the display device 100 can be reduced without affecting the function of the touch layer 20. Finally, the display device 100 of the present application can overcome the problem that the brightness and chromaticity of the full module screen in the on state change due to UV light or sunlight.

The foregoing has described in detail a display device provided by embodiments of the present application, and specific examples have been set forth herein to illustrate the principles and embodiments of the present application, the above examples being provided only to assist in understanding the methods of the present application and their core ideas; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims

1. A display device comprising a display panel, the display device further comprising: the reflecting layer is arranged on the light emitting side of the display panel, has full or partial filtering effect on light rays with preset wavelength, and has the preset wavelength less than 400 nanometers; wherein the transmittance of the reflecting layer to light rays with the wavelength ranging from 440 nanometers to 470 nanometers is more than or equal to 80 percent, and the reflecting layer is used for filtering the ambient light incident to the display panel;

the touch control layer is arranged on the light emitting side of the display panel and comprises a plurality of layers of insulating layers, and one or more layers of the plurality of layers of insulating layers are arranged as the reflecting layer; the touch control layer further comprises electrode bridge points and touch control electrodes, and the multilayer insulating layer comprises a first insulating layer, a second insulating layer and a third insulating layer which are sequentially laminated; providing at least one of the first insulating layer, the second insulating layer, and the third insulating layer as the reflective layer; the touch electrode is arranged between the first insulating layer and the second insulating layer; the electrode bridge point is arranged between the second insulating layer and the third insulating layer; and the second insulating layer is provided with a connecting hole corresponding to the electrode bridge point position, the touch electrode comprises a transmitting electrode and a receiving electrode, wherein the transmitting electrode or the receiving electrode is connected with the electrode bridge point at the position corresponding to the connecting hole through the connecting hole, and filling materials in the connecting hole are the same as the electrode bridge point.

2. The display device according to claim 1, wherein the reflective layer comprises a plurality of first layers and a plurality of second layers, wherein the first layers and the second layers are alternately stacked in order, and wherein a refractive index of the first layers is greater than a refractive index of the second layers.

3. The display device of claim 2, wherein the first layer and the second layer are both inorganic layers.

4. A display device as claimed in claim 3, wherein the material of each of the first layers is SiN ₄ Or TiO ₂ At least one of (a) and (b);

each of the second layered materials is SiO ₂ 、SiN ₄ Or TiO ₂ At least one of them.

5. The display device of claim 2, wherein the number of layered layers of the reflective layer ranges from 6 to 8 layers.

6. The display device of claim 1, further comprising a cover plate disposed on a light-emitting side of the display panel, the reflective layer disposed on a surface of the cover plate facing or facing away from the display panel.

7. The display device of claim 6, wherein the display panel further comprises a polarizing layer disposed between the display panel and the cover plate.