CN117518578A

CN117518578A - Display device

Info

Publication number: CN117518578A
Application number: CN202311113688.XA
Authority: CN
Inventors: 程薇
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2023-08-29
Filing date: 2023-08-29
Publication date: 2024-02-06
Also published as: WO2025044398A1

Abstract

The embodiment of the present application discloses a display device, which relates to the field of display technology. A display device includes a display panel and a privacy film. The privacy film includes a plurality of wire grids arranged at intervals. The gaps between the plurality of wire grids form a plurality of slits, and the plurality of slits are filled with transparent films. Optical medium; the refractive index of the wire grid and the light-transmitting medium are different. Based on the technical solutions disclosed in the embodiments of this application, the anti-peep effect can be selectively turned on, which can ensure the transmittance of screen light and avoid visual fatigue of users. Moreover, when the power is off, the anti-peep film can be used as a polarizer. The scattering function of the light medium can also broaden the viewing angle.

Description

Display device

Technical Field

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

Background

Currently, display products are widely used in personal display devices, and the requirement of peep-proof function is becoming more and more common for privacy consideration of users.

The current peep-proof film has the peep-proof effect, but because the related peep-proof film is mainly manufactured based on the shutter structure principle, the peep-proof film can realize peep-proof, but the transmittance of light rays is reduced, so that the surface brightness of the display device is greatly attenuated, the screen observed by eyes is too dark, visual fatigue is easily caused, and the improvement is needed.

Disclosure of Invention

An object of the present application is to provide a display device, which uses a plurality of wire grids to form a plurality of slits, and fills a light-transmitting medium in the plurality of slits, and influences a reflection phase of the light-transmitting medium through an electric field to complete modulation of polarized light, thereby improving transmittance of a screen and avoiding causing visual fatigue to a user while realizing visual peep-proof effect.

The embodiment of the application provides a display device, which comprises a display panel and a peep-proof film arranged on one side of the light-emitting side of the display panel, wherein the peep-proof film comprises a plurality of wire grids which are arranged at intervals, gaps of the wire grids form a plurality of slits, and a light-transmitting medium is filled in the slits; the refractive indices of the wire grid and the light transmissive medium are different.

Optionally, in some embodiments of the present application, the plurality of wire grids are parallel to each other and are disposed at equal intervals;

or, the wire grids are parallel to each other, and the intervals between the wire grids are gradually reduced from the middle part of the peep-proof film to two sides.

Optionally, in some embodiments of the present application, when the plurality of wire grids are parallel to each other and are disposed at equal intervals, the refractive index of the light-transmitting medium is gradually increased from the middle portion of the privacy film to two sides.

Optionally, in some embodiments of the present application, when the plurality of wire grids are parallel to each other and the gaps between the wire grids are gradually decreased from the middle part of the privacy film to two sides, the widths of the wire grids are gradually increased from the middle part of the privacy film to two sides, and the refractive indexes of the light-transmitting mediums in the slits are equal.

Optionally, in some embodiments of the present application, the material of the light-transmitting medium is acrylic resin or epoxy resin.

Optionally, in some embodiments of the present application, the light-transmitting medium is internally provided with a plurality of uniformly distributed transparent microspheres.

Optionally, in some embodiments of the present application, the transparent microsphere is made of polycarbonate, acrylic resin or polysiloxane resin, and the refractive index of the transparent microsphere is 1.6-1.7.

Optionally, in some embodiments of the present application, the privacy film further comprises:

the middle medium layer is arranged on one side of the peep-proof film, which is close to the display panel, and is used for bearing the plurality of wire grids and the light-transmitting medium middle medium layer.

Optionally, in some embodiments of the present application, the display panel includes:

a color film substrate; and

the reflecting layer is arranged on one side of the color film substrate;

the reflective layer is positioned between the color film substrate and the peep-proof film, and is a reflective polarizer.

Optionally, in some embodiments of the present application, the reflective layer forms an upper polarizer of the display panel.

The beneficial effects of the embodiment of the application are that:

in this embodiment of the application, provide a display device, including display panel and peep-proof membrane, peep-proof membrane utilizes many wire grids to form many slits to fill printing opacity medium in many slits, through applying voltage to many wire grids, change the reflection phase of printing opacity medium, accomplish the modulation to polarized light, replace traditional shutter structure, thereby when realizing vision peep-proof effect, improve the transmissivity of screen, avoid causing visual fatigue for the user.

Meanwhile, the peep-proof film can be directly attached to an existing display device, the structure of the existing display device is not required to be changed, the practicability is higher, and the use is more convenient. When the wire grid is not electrified, the super-structured surface layer can be used as a metal polaroid, the peep-proof film is in a high-transmittance state, and the light-transmitting medium introduces refractive index difference, so that the visual angle of the display device can be further widened by virtue of the scattering function of the light-transmitting medium. Therefore, the peep-proof function of the display device not only can realize the peep-proof effect, but also can be selectively opened, and has more flexibility and convenience.

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 structural diagram of a display device according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a privacy film according to one embodiment of the present disclosure;

fig. 3 is a top view of a privacy film provided in one embodiment of the present application;

fig. 4 is a top view of a privacy film provided in accordance with another embodiment of the present application;

FIG. 5 is a schematic partial cross-sectional view of a privacy film according to one embodiment of the present disclosure, primarily for use in the embodiment of transparent microspheres;

fig. 6 is a schematic structural diagram of an intermediate dielectric layer according to an embodiment of the present application.

Reference numerals illustrate: 100. a privacy film; 110. an intermediate dielectric layer; 111. a substrate; 112. a surface film layer; 120. a super-structured surface layer; 121. a wire grid; 122. a light-transmitting medium; 1221. transparent microspheres; 130. a slit; 200. a backlight; 300. a polarizer; 400. an array substrate; 500. a color film substrate; 600. a liquid crystal; 700. a reflective layer.

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.

Currently, display products are widely used in personal display devices, and in order to allow users to privacy, the display devices with peep-proof function are more and more popular. The current peep-proof film 100 is mainly made based on a shutter structure principle, and the peep-proof film 100 can realize peep-proof, but has great attenuation on the surface brightness of a display device and has great defects.

In recent years, with the rapid development of micro-nano processing technology and metal surface plasma, local phase modulation can be performed based on the super-structured surface, and flexible local phase adjustment can be realized by utilizing the characteristic that the plasma propagation constant of the metal slit 130 changes along with the width of the slit 130, and the refraction and reflection law of the super-structured surface can be established based on the characteristics.

The width and period of each wire of the wire grid is much smaller than the wavelength. In the case that the polarization of the wire grid is parallel to the wire grid direction, exciting the induced current of the wire grid, so that the response of the wire grid to light is strong absorption; while perpendicular, light can be transmitted because the wire grid is much smaller in dimension than the wavelength, and no resonance is achieved. The period is very small, the angle of the diffraction grid is very large under the normal incidence condition, and the energy occupied by the grid is smaller and smaller along with the increase of the angle of the diffraction grid according to the scattering theory; at some wavelengths, the grating is even beyond the diffraction limit, i.e. there is no diffraction grating.

Based on the above theory, the embodiments of the present application provide a display device, which is described in detail below. The following description of the embodiments is not intended to limit the preferred embodiments.

Referring to fig. 1, the present embodiment provides a display device, which can adopt different display modes such as OLED, LCD, MLED and VA, and includes a display panel and a peep-proof film 100 disposed on a light-emitting side of the display panel; the peep-proof film 100 can increase the peep-proof effect for the display panel, so that the display device can realize the peep-proof function as a whole.

Referring to fig. 2, in the present embodiment, the peep-proof film includes an intermediate dielectric layer 110 and an ultra-structured surface layer 120 disposed on one side of the intermediate dielectric layer 110.

The super-structured surface layer 120 is a nano-structured layer, which can modulate polarized light and narrow emergent light, so as to reduce side angle emergent light, and further realize visual peep-proof effect on the premise of guaranteeing light filtering.

In this embodiment, the super-structure surface layer 120 includes a plurality of wire grids 121 disposed on the intermediate dielectric layer 110 at intervals, and the plurality of wire grids 121 are parallel to each other on the intermediate dielectric layer 110. The gaps of each wire grid 121 will form a plurality of slits 130, each slit 130 being filled with a light transmissive medium 122.

Wherein, the plurality of wire grids 121 can be understood as a plurality of strip metals arranged in parallel and spaced apart on the surface of the intermediate dielectric layer 110. The material of the wire grid 121 may be flexibly selected according to needs, for example, the material of the wire grid 121 may be nickel, aluminum or other conductive materials, which is not limited in particular.

In actually manufacturing the wire grids 121, the plurality of wire grids 121 may be stamped on the intermediate dielectric layer 110 by nanoimprinting so as to be integrated, or the plurality of wire grids 121 may be formed by other methods, which is not particularly limited.

Similarly, the material of the light-transmitting medium 122 may be flexibly selected, for example, the light-transmitting medium 122 may be acrylic resin or epoxy resin, or other similar resin materials, which is not limited in particular. However, when determining the material of the light-transmitting medium 122 and actually filling the light-transmitting medium 122, it should be ensured that the refractive index of the light-transmitting medium 122 is adjustable, and the refractive index of the light-transmitting medium 122 can be controlled within a range of 1.2-1.8.

In the case of filling the light transmitting medium 122 into the plurality of slits 130, the operation may be performed by one single-layer filling or may be performed by two or more multi-layer filling, which is not particularly limited.

It should be noted that, when a plurality of wire grids 121 and transparent media 122 are actually disposed, the spacing between the wire grids 121 and the refractive index of the transparent media 122 both affect the final peep-proof effect of the peep-proof film; meanwhile, the refractive indexes of the wire grid 121 and the light-transmitting medium should be different, that is, the refractive index of the wire grid 121 is greater than the refractive index of the light-transmitting medium 122, or the refractive index of the light-transmitting medium 122 is greater than the refractive index of the wire grid 121; specifically, the refractive index values of the wire grid 121 and the light transmitting medium 122 are not limited herein.

In one embodiment, as shown in fig. 3, the wire grids 121 may be disposed at equal intervals on the intermediate dielectric layer 110 to ensure the privacy effect of the privacy film. At this time, the refractive index of the light-transmitting medium 122 filled between the plurality of wire grids 121 may be gradually increased from the middle of the privacy film to both sides.

In another embodiment, as shown in fig. 4, in order to ensure the peep-proof effect of the peep-proof film, the spacing between the wire grids 121 is gradually decreased from the middle of the peep-proof film to two sides, and the width of the wire grid 121 is gradually increased from the middle of the peep-proof film to two sides. At this time, the refractive index of the light-transmitting medium 122 filled in each slit 130 may be the same. Specifically, the width of the wire grid 121 may be controlled to be 30-90um, and the height of the wire grid on the intermediate dielectric layer 110 may be 100-180um; the width of the slit 130 may also be controlled to be 30-90um.

For example, in one embodiment, the plurality of wire grids 121 described above may be disposed on the intermediate dielectric layer 110 in an equally spaced manner. At this time, the widths of the wire grid 121 and the slits 130 may be 60um, and the refractive index of the light-transmitting medium 122 filled in each slit 130 is gradually increased from the middle of the privacy film to both sides, but not more than 1.8 at maximum.

For example, in another embodiment, the pitches of the wire grids 121 are gradually decreased from the middle to the two sides of the privacy film, and the widths of the wire grids 121 are gradually increased from the middle to the two sides of the privacy film. At this time, the width of the wire grids 121 located at the middle position of the peep-proof film may be 30um, and the width of each wire grid 121 arranged towards two sides of the peep-proof film may be sequentially increased (not more than 90 um) on the basis of 30um, while the width of the slit 130 located at the middle position of the peep-proof film (or the width of the light-transmitting medium) may be 90um, and the width of each slit 130 arranged towards two sides of the peep-proof film may be sequentially decreased (not less than 30 um) on the basis of 90um. In this case, the refractive index of the light-transmitting medium 122 in each slit 130 may be kept uniform.

It will be appreciated that the above-mentioned dimensions of the wire grid 121 and the slits 130 are merely preferred embodiments given herein based on experiments, and the specific dimensions thereof can be flexibly and optimally designed according to the needs, which are not particularly limited.

According to the variation characteristic of the plasma propagation constant of the metal slit along with the slit width, in the embodiment, when the wire grid 121 and the light-transmitting medium 122 are actually formed, any gradient change of the phase angle of the emergent light can be realized within the required range by changing the width of the slit 130 in the wire grid 121, and the phase angle of the emergent light can be flexibly adjusted by changing the widths of the wire grid 121 and the slit 130 on the intermediate medium layer 110. Therefore, with the aid of the wire grid 121 and the light-transmitting medium 122, the embodiment of the application can meet diversified modulation requirements in a requirement range, so as to flexibly control the phase angle of emergent light, and flexibly adjust the width of the viewing angle of the corresponding display screen.

In practical application, by means of the plurality of wire grids 121 and the light-transmitting medium 122, the privacy film 100 can transmit all incident light when the wire grids 121 are not energized; at this time, due to the influence of the refractive index of the light-transmitting medium 122, the light is further scattered during transmission, so that the corresponding display device obtains a display effect with a wide viewing angle; at this time, the peep-proof film 100 does not have a peep-proof effect, but may function like a polarizer.

When a voltage is applied to the wire grids 121, for example, when any two adjacent wire grids 121 are respectively connected with the anode and the cathode of the power supply element, an electric field is formed between the two adjacent wire grids 121, and electromagnetic resonance of the metal micro-nano structure is excited, so that the reflection phase of the light-transmitting medium 122 is enhanced, a certain reflection efficiency is presented, the effect of imaging the angle of the fuzzy side is achieved, and the peep-proof function is realized.

It should be understood that, in the display device provided in the embodiment of the present application, the actual effect of the privacy film 100 may be changed by controlling the current state of the wire grid 121, so as to change the display effect of the display device. When not energized, privacy film 100 may be used as a metallic polarizer; and when it is energized, the privacy film 100 may achieve a visual privacy effect. Therefore, the peep-proof effect of the display device provided by the embodiment of the application can be selectively opened or closed according to the requirement of a user, and the use is more flexible.

In this embodiment, the privacy film 100 includes an intermediate dielectric layer 110 and an ultra-structured surface layer 120 disposed on the intermediate dielectric layer 110; however, the intermediate dielectric layer 110 may be omitted, that is, in another embodiment, the privacy film may not include the intermediate dielectric layer 110, which may be formed by the super-structured surface layer 120 alone, or may achieve the privacy effect.

Referring to fig. 2 and 5, in the embodiment, when the slit 130 is filled with the light-transmitting medium 122, the filling height of the light-transmitting medium 122 may be higher than the height of the wire grid 121, and the specific dimension of the light-transmitting medium 122 higher than the wire grid 121 may be flexibly and optimally designed according to the requirement, for example, the light-transmitting medium 122 may be higher than the wire grid 121um, 15um, 20um, 25um or other dimensions, which is not limited in particular.

In one embodiment, in order to further improve the peep-proof effect, a plurality of transparent microspheres 1221 may be filled into the light-transmitting medium 122 when the light-transmitting medium 122 is actually molded; the transparent microspheres 1221 may be made of Polycarbonate (PC), acrylic resin or polysiloxane resin; the transparent microspheres 1221 may be uniformly dispersed in the system of the light-transmitting medium 122, and the refractive index of the transparent microspheres 1221 may be controlled to be 1.6-1.7, and specific values may be determined according to design requirements.

In another embodiment, to prolong the service life of the privacy film 100, an anti-glare film and/or a high-hardness protective film, which may be an acrylic resin or other materials, is further disposed on the side of the super-structured surface layer 120 facing away from the middle dielectric layer 110, which is not limited in particular.

Referring to fig. 2 and 6, the intermediate dielectric layer 110 may be a single-layer substrate 111 or a multi-layer composite laminated structure.

In one embodiment, the intermediate dielectric layer 110 is a single-layered substrate 111; in this case, the substrate 111 may be a rigid substrate or a flexible substrate. When the intermediate dielectric layer 110 is a rigid substrate, it may be base glass; when the intermediate dielectric layer 110 is a flexible substrate, it may be an organic polymer or an organic-inorganic doped composite. For example, the organic polymer may be Polyimide (PI) or ethylene terephthalate (PolyethyleneTerephthalate, PET), or the like; the organic-inorganic doped compound can be an organic polymer doped glass fiber of polyimide, and the glass fiber has higher toughness, so that the flexibility strength of the intermediate dielectric layer 110 can be obviously improved, and the intermediate dielectric layer 110 is not easy to fracture and peel.

In another embodiment, the intermediate dielectric layer 110 is a multi-layered composite laminated structure, and includes a substrate 111 and a surface film layer 112 disposed on a side of the substrate 111 near the super-structure surface layer 120.

In this case, the substrate 111 may be a rigid substrate or a flexible substrate. When the intermediate dielectric layer 110 is a rigid substrate, it may be base glass; when the intermediate dielectric layer 110 is a flexible substrate, it may be an organic polymer or an organic-inorganic doped composite. For example, the organic polymer may be Polyimide (PI) or ethylene terephthalate (PolyethyleneTerephthalate, PET), or the like; the organic-inorganic doped compound can be an organic polymer doped glass fiber of polyimide, and the glass fiber has higher toughness, so that the flexibility strength of the intermediate dielectric layer 110 can be obviously improved, and the intermediate dielectric layer 110 is not easy to fracture and peel.

The surface film layer 112 may be any of a triacetate fiber film (TriacetylCellulose, TAC) and ethylene terephthalate (PolyethyleneTerephthalate, PET), or may be a laminate of TAC and PET, and is not particularly limited.

In this embodiment, the display panel may be any one of OLED, LCD, MLED, VA and other types of display panels, which is not limited in particular, that is, the display device provided in this embodiment of the present application may adopt different display modes such as OLED, LCD, MLED and VA, and the view line of the peep-proof function is applicable to any display mode without selection dependence. Meanwhile, the display device comprises any product or component with display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

Referring to fig. 1, in one embodiment, the display panel is an LCD display panel, and includes a backlight 200, a polarizer 300 disposed on one side of the backlight 200, an array substrate 400 disposed on one side of the polarizer 300 away from the backlight 200, a color film substrate 500 disposed on one side of the array substrate 400 away from the polarizer 300, a liquid crystal 600 disposed between the array substrate 400 and the color film substrate 500, and a reflective layer 700 disposed on one side of the color film substrate 500 away from the array substrate 400. The peep-proof film 100 is disposed on a side of the reflective layer 700 away from the color film substrate 500.

It should be noted that, the reflective layer 700 may be a conventional polarizer or a reflective polarizer; however, in view of the anti-peeping effect, the reflective layer 700 is preferably a reflective polarizer, that is, in practical application, the reflective polarizer may be used to replace a common polarizer used as an upper polarizer in a conventional LCD display panel, that is, the reflective layer 700 may form an upper polarizer on a corresponding display panel; thus, after the ambient light enters the super-structured surface layer 120, the reflective polarizer can increase the reflection and reemittance of the ambient light entering the super-structured surface layer 120, so as to facilitate formation of interference light and reduce the visibility of the anti-peeping angle picture.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

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. The display device is characterized by comprising a display panel and a peep-proof film arranged on one side of the light-emitting side of the display panel, wherein the peep-proof film comprises a plurality of wire grids which are arranged at intervals, gaps of the wire grids form a plurality of slits, and a light-transmitting medium is filled in the slits; the refractive indices of the wire grid and the light transmissive medium are different.

2. The display device according to claim 1, wherein the plurality of wire grids are parallel to each other and are arranged at equal intervals;

3. The display device according to claim 2, wherein when the plurality of wire grids are parallel to each other and are disposed at equal intervals, the refractive index of the light-transmitting medium is disposed in an increasing manner from the middle to both sides of the privacy film.

4. The display device according to claim 2, wherein when the plurality of wire grids are parallel to each other with a gap between them being gradually decreased from a middle portion of the privacy film to both sides, a width of the wire grids is gradually increased from the middle portion of the privacy film to both sides, and refractive indexes of the light-transmitting medium in the respective slits are equal.

5. The display device according to claim 1, wherein the light-transmitting medium is made of acrylic resin or epoxy resin.

6. The display device according to claim 5, wherein the light-transmitting medium is internally provided with a plurality of uniformly distributed transparent microspheres.

7. The display device according to claim 6, wherein the transparent microspheres are made of polycarbonate, acrylic resin or polysiloxane resin, and the refractive index of the transparent microspheres is 1.6-1.7.

8. The display device of any one of claims 1-7, wherein the privacy film further comprises:

the middle medium layer is arranged on one side of the peep-proof film, which is close to the display panel, and is used for bearing the plurality of wire grids and the light-transmitting medium.

9. The display device according to any one of claims 1 to 7, wherein the display panel includes:

a color film substrate; and

the reflecting layer is arranged on one side of the color film substrate;

10. The display device of claim 9, wherein the reflective layer forms an upper polarizer of the display panel.