CN111208666B

CN111208666B - Display device

Info

Publication number: CN111208666B
Application number: CN202010157517.7A
Authority: CN
Inventors: 任亮亮; 周星; 徐东亮; 陈芪飞; 鹿堃; 宋冠男; 徐迪; 卢景洲; 柏玲; 张晓哲; 王阔
Original assignee: BOE Technology Group Co Ltd; Fuzhou BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Fuzhou BOE Optoelectronics Technology Co Ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2023-06-20
Anticipated expiration: 2040-03-09
Also published as: CN111208666A

Abstract

The application provides a display device, relates to the technical field of display, and is used for solving the peeping-proof display problem of a screen of an electronic product. A display device, comprising: a liquid crystal display panel having a display surface and a back surface opposite to the display surface; a polymer dispersed liquid crystal film disposed on the back surface of the liquid crystal display panel; the transparent dimming layer is arranged on one side of the polymer dispersed liquid crystal film far away from the liquid crystal display panel; the transparent dimming layer is provided with a prism structure at one side far away from the polymer dispersed liquid crystal film and is used for performing visual angle contraction on incident light rays; the backlight module is arranged on one side, far away from the liquid crystal display panel, of the transparent dimming layer, the light emitting surface of the backlight module faces the transparent dimming layer, and the surface, facing the transparent dimming layer, of the backlight module is provided with a peep-proof film. Therefore, the display device contracts the light rays through the peep-proof film, and the light rays passing through the peep-proof film contraction visual angle are further subjected to visual angle contraction through the prism structure of the transparent dimming layer, so that a good peep-proof effect is achieved.

Description

Display device

Technical Field

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

Background

With the development of electronic information technology, browsing and processing information using screens of various electronic products has been commonly found in people's daily lives. For privacy and confidentiality, the user of the electronic product does not want the information presented by the screen of the electronic product to be peeped by others, so how to realize effective peeping-proof display of the screen of the electronic product becomes a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The embodiment of the invention provides a display device which is used for solving the peep-proof display problem of a screen of an electronic product.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:

in a first aspect, there is provided a display device including: a liquid crystal display panel having a display surface and a back surface opposite to the display surface; a polymer dispersed liquid crystal (polymer dispersed liquidcrystal, PDLC) film provided on the back surface of the liquid crystal display panel; the transparent dimming layer is arranged on one side of the polymer dispersed liquid crystal film far away from the liquid crystal display panel; the transparent dimming layer is provided with a prism structure at one side far away from the polymer dispersed liquid crystal film, and the prism structure is used for carrying out visual angle contraction on incident light rays; the backlight module is arranged on one side of the transparent dimming layer far away from the liquid crystal display panel, and the light emergent surface of the backlight module faces the transparent dimming layer; the surface of the backlight module facing the transparent dimming layer is provided with a peep-proof film.

Alternatively, the prism structure may be an isosceles prism, a right angle prism, an equilateral prism, an isosceles right angle prism, or the like.

Optionally, the peep-proof film has a light surface, and the light surface faces the transparent dimming layer. By reversing the peep-proof film, film wrinkling (sheet wire) caused by smooth surface adsorption of the film material can be avoided.

Optionally, the polymer dispersed liquid crystal film includes a first electrode layer, a second electrode layer, and a polymer dispersed liquid crystal layer; the polymer dispersed liquid crystal layer rotates under the drive of the first electrode layer and the second electrode layer; the first electrode layer and the second electrode layer are arranged on the surface of the transparent dimming layer facing the liquid crystal display panel. The first electrode layer and the second electrode layer are arranged on the surface of the transparent dimming layer, so that the deflection of liquid crystal molecules in the polymer dispersed liquid crystal layer can be controlled; in addition, no more film layers are needed to be introduced, and the thickness of the module is reduced.

Optionally, the first electrode comprises a plurality of first strip-shaped electrodes, the second electrode comprises a plurality of second strip-shaped electrodes, and the first strip-shaped electrodes and the second strip-shaped electrodes are arranged at intervals.

Optionally, the first electrode is disposed away from the transparent dimming layer opposite to the second electrode, the first electrode includes a plurality of first strip-shaped electrodes, and the second electrode includes a plurality of second strip-shaped electrodes or is planar.

Optionally, the display device further comprises a transparent spacer layer and a transparent adhesive layer; the transparent spacer layer is arranged between the liquid crystal display panel and the polymer dispersed liquid crystal film and is used for avoiding the adsorption of the liquid crystal display panel and the polymer dispersed liquid crystal film; the transparent adhesive layer is arranged between the transparent spacer layer and the liquid crystal display panel and is used for bonding the transparent spacer layer and the liquid crystal display panel. By providing a transparent spacer layer bonded to the liquid crystal display panel, rainbow marks caused by adsorption generated when a lower polarizing layer provided at the bottom of the liquid crystal display panel and a polymer dispersed liquid crystal film are in direct contact in the related art can be avoided.

Optionally, the display device further includes a transparent spacer layer disposed between the liquid crystal display panel and the polymer dispersed liquid crystal film; the polymer dispersed liquid crystal film comprises a first electrode layer, a second electrode layer and a polymer dispersed liquid crystal layer, wherein the polymer dispersed liquid crystal layer rotates under the drive of the first electrode layer and the second electrode layer; the first electrode layer is arranged on the surface of the transparent spacing layer, facing the transparent dimming layer, and the second electrode layer is arranged on the surface of the transparent dimming layer, facing the transparent spacing layer. The first electrode layer and the second electrode layer are respectively arranged on the surface of the transparent spacing layer and the surface of the transparent dimming layer, so that the deflection of liquid crystal molecules in the polymer dispersed liquid crystal layer can be controlled.

Optionally, the display device further comprises a transparent adhesive layer; the transparent adhesive layer is arranged between the transparent spacer layer and the liquid crystal display panel and is used for bonding the transparent spacer layer and the liquid crystal display panel. By providing a transparent spacer layer bonded to the liquid crystal display panel, rainbow marks caused by adsorption generated when a lower polarizing layer provided at the bottom of the liquid crystal display panel and a polymer dispersed liquid crystal film are in direct contact in the related art can be avoided.

Alternatively, the first electrode layer is planar in shape. The manufacturing process is simple.

Optionally, the display device further includes a frame sealing adhesive disposed between the transparent spacer layer and the transparent dimming layer and located at the periphery of the polymer dispersed liquid crystal layer. The polymer dispersed liquid crystal layer can be encapsulated between the transparent spacing layer and the transparent dimming layer through the frame sealing glue.

Optionally, the liquid crystal display panel includes a display area and a peripheral area located at the periphery of the display area; the transparent dimming layer comprises a peep-proof area and a binding area; the peep-proof area is opposite to the display area, and the binding area is opposite to the peripheral area; the display device also comprises pins and a main board; the pins are positioned in the binding area and used for transmitting control signals on the main board to the polymer dispersed liquid crystal film so as to control the deflection of the polymer dispersed liquid crystal layer. The pins are arranged in the binding area, which is not right opposite to the display area of the liquid crystal display panel, of the transparent dimming layer, so that the pins can not be contacted and pressed with the polymer dispersed liquid crystal layer during packaging, and the problem of liquid crystal failure at the positions of the pins in a reliability environment is avoided.

Drawings

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

Fig. 1a is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 1b is a structural relationship diagram of a display device according to an embodiment of the present application;

fig. 1c is a schematic structural diagram of a liquid crystal display panel according to an embodiment of the present application;

fig. 1d is a schematic structural diagram of another lcd panel according to an embodiment of the present disclosure;

fig. 1e is a schematic structural diagram of another display device according to an embodiment of the present application;

fig. 1f is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

fig. 2a is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

FIG. 2b is a schematic view of a polymer dispersed liquid crystal film according to an embodiment of the present disclosure;

FIG. 2c is a schematic view showing another polymer dispersed liquid crystal film according to the embodiment of the present application;

fig. 2d is a schematic light path diagram of a prism structure according to an embodiment of the present disclosure;

fig. 3a is a schematic structural diagram of a transparent dimming layer according to an embodiment of the present application;

fig. 3b is a schematic structural diagram of another transparent dimming layer according to an embodiment of the present disclosure;

fig. 3c is a schematic structural diagram of a transparent dimming layer according to an embodiment of the present disclosure;

Fig. 3d is a schematic structural diagram of a privacy film according to an embodiment of the present disclosure;

fig. 3e is a schematic diagram illustrating reverse arrangement of a privacy film according to an embodiment of the present application;

FIG. 4a is a schematic view of an optical path of a state according to an embodiment of the present disclosure;

FIG. 4b is a schematic view of an optical path of another state according to an embodiment of the present disclosure;

FIG. 4c is a timing diagram of a voltage between two electrode layers according to an embodiment of the present application;

fig. 5a is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

fig. 5b is a schematic diagram of an arrangement manner of two electrode layers according to an embodiment of the present application;

FIG. 5c is a schematic diagram of another arrangement of two electrode layers according to an embodiment of the present disclosure;

FIG. 5d is a schematic diagram of another arrangement of two electrode layers according to an embodiment of the present disclosure;

fig. 5e is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

fig. 5f is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

fig. 5g is a schematic structural diagram of still another display device according to an embodiment of the present application;

FIG. 6a is a schematic diagram of a first structure according to an embodiment of the present disclosure;

FIG. 6b is a schematic diagram of a second structure according to an embodiment of the present disclosure;

FIG. 6c is a schematic diagram of a third structure according to an embodiment of the present disclosure;

fig. 6d is a schematic diagram of a light modulation board according to an embodiment of the present application;

FIG. 6e is a schematic diagram of a fourth structure according to an embodiment of the present disclosure;

fig. 6f is a schematic structural diagram of another display device according to an embodiment of the present disclosure;

reference numerals:

01-a display device; 10-cover plate; 20-a liquid crystal display; 3-a liquid crystal display panel; 30-a backlight module; 31-an array substrate; 310-a transparent spacer layer; 32-a counter substrate; 33-a liquid crystal layer; 34, frame sealing glue; 35-an upper polarizing layer; 36-a lower polarizing layer; 37-a color filter layer; 38-a polymer dispersed liquid crystal film; 383-a polymer dispersed liquid crystal layer; 39-a transparent dimming layer; 391-prismatic structure; 40-middle frame; 400-main board; 41-a light source; 42-a light guide plate; 43-a reflective sheet; 44-a diffusion sheet; 45-a brightness enhancement film; 46-a privacy film; 461-a peep-proof structural layer; 462—an upper protective layer; 463-a lower protective layer; 4611—an ultra-fine shutter structure; 4621-AG layer; 50-a housing; 500-two electrode layers; 51-a first electrode layer; 510-a first strip electrode; 511-a first isolation layer; 512-a second isolation layer; 52-a second electrode layer; 520-second strip electrodes; 53-an isolation layer; 54, frame sealing glue; 6-a light modulation plate; 601-a first structure; 602-a second structure; 603-a third structure; 604-a fourth structure; 63-pins; 64-FPC; an A-display area; b-peripheral region; a-a peep-proof area; b-binding area.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art. The terms "first," "second," "third," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

The terms of orientation such as "left", "right", "upper" and "lower" are defined with respect to the orientation in which the display device is schematically positioned in the drawings, and it should be understood that these directional terms are relative concepts that are used for the description and clarity of the relative orientation and that may be varied accordingly with respect to the orientation in which the display device is positioned.

With the development of display technology, liquid crystal display technology has been widely used in various display devices. The embodiment of the application provides a display device. The display device can be a tablet personal computer, a mobile phone, an electronic reader, a remote controller, a personal computer (personal computer, PC), a notebook computer, a personal digital assistant (personal digital assistant, PDA), a vehicle-mounted device, a network television, a wearable device, a television and other products with display interfaces, and an intelligent display wearing product such as an intelligent watch and an intelligent bracelet. The embodiment of the present application does not particularly limit the specific form of the display device. For convenience of explanation, the following embodiments are exemplified by a display device as a mobile phone.

As shown in fig. 1a, the display device 01 mainly includes: the cover plate 10, the liquid crystal display panel 3, a backlight unit (BLU) 30, a middle frame 40 and a housing 50 are disposed in the housing 50, and the liquid crystal display panel 3, the backlight unit 30 and the middle frame 40 are disposed in the housing 50.

The middle frame 40 is located between the backlight module 30 and the housing 50, as shown in fig. 1b, the surface of the middle frame 40 away from the backlight module 30 is used for mounting internal components such as a motherboard 400, and the motherboard 400 may be, for example, a printed circuit board (printed circuit board, PCB). The main board 400 is used for providing electrical signals to the backlight module 30 and the liquid crystal display panel 3, and the liquid crystal display panel 3 and the backlight module 30 are electrically connected with the main board 400 through a flexible circuit board (flexible printed circuit, FPC).

The liquid crystal display panel 3 has a light-emitting side that can see a display screen and a back surface that is disposed opposite to the light-emitting side, the cover plate 10 is located on the light-emitting side of the liquid crystal display panel 3 for protecting the liquid crystal display panel 3, and the cover plate 10 and the liquid crystal display panel 3 are bonded by an optically transparent adhesive (Optically Clear Adhesive, OCA).

The cover plate 10 may be, for example, cover Glass (CG), which may have a certain toughness.

The backlight module 30 is located at the back of the liquid crystal display panel 3, and is used for providing light source for the liquid crystal display panel 3.

In addition, as shown in fig. 1c, the liquid crystal display panel 3 includes a liquid crystal display 20, an upper polarizing layer 35 disposed on a side of the liquid crystal display 20 near the cover plate 10, and a lower polarizing layer 36 disposed on a side of the liquid crystal display 20 near the backlight module 30. That is, the liquid crystal display panel 3 is constituted by the liquid crystal display 20, the upper polarizing layer 35, and the lower polarizing layer 36 in common.

As shown in fig. 1c, the liquid crystal display 20 includes an array substrate 31, a counter substrate 32, and a liquid crystal layer 33 disposed between the array substrate 31 and the counter substrate 32, wherein the array substrate 31 and the counter substrate 32 are aligned by a frame sealing adhesive 34, so that the liquid crystal layer 33 is limited in an area surrounded by the frame sealing adhesive 34.

In order to enable the liquid crystal display panel 3 to realize color display, the liquid crystal display panel 3 further includes a color filter layer 37. The color filter layer 37 may be disposed on the counter substrate 32, and in this case, the counter substrate 32 may be referred to as a color filter substrate.

Regarding the structure and the arrangement position of the upper polarizing layer 35, as shown in fig. 1c, the upper polarizing layer 35 in the liquid crystal display panel 3 may be a manufactured Polarizer (POL). In this case, a polarizing plate may be attached to the surface of the light-emitting side of the liquid crystal display 20.

Alternatively, as shown in fig. 1d, the upper polarizing layer 35 in the liquid crystal display panel 3 may be a wire Grid Polarizer (GP). For example, during the fabrication of the counter substrate 32, the wire grid polarizing layer may be integrated into the counter substrate 32 by sputtering, nanoimprinting, photolithography, or the like.

The material constituting the wire grid polarizing layer may be a metal. Illustratively, the materials comprising the wire grid polarizing layer include, but are not limited to, aluminum (Al), copper (Cu), silver (Ag), gold (Au), chromium (Cr), and the like.

Regarding the structure and the arrangement position of the lower polarizing layer 36, as shown in fig. 1c, the lower polarizing layer 36 may be a fabricated polarizer. In this case, the lower polarizing layer 36 is disposed on the surface of the back surface of the liquid crystal display 20.

Alternatively, as shown in fig. 1d, the lower polarizing layer 36 may be a wire grid polarizing layer integrated in the array substrate 31 during the fabrication of the array substrate 31.

For convenience of explanation, the upper polarizing layer 35 and the lower polarizing layer 36 in the display device 01 are both polarizers.

The backlight module 30 in the display device 01 may be a side-in backlight module or a direct-down backlight module. The side-in type backlight module is used for arranging a backlight source on the side face of the backlight module, and the backlight source emits from the side face of the backlight module. The direct type backlight module is configured such that a backlight source is disposed at a lower portion of the backlight module, and the backlight source directly irradiates the liquid crystal display panel, so that the direct type backlight module may also be called as a direct type backlight module.

For example, when the backlight module 30 is a side-in type backlight module, as shown in fig. 1e, the backlight module 30 may include a light source 41, a light guide plate 42, and a reflective sheet 43. The light source 41 may be disposed at one or more sides of the light guide plate. The light source 41 may be electrically connected to a main board of the display device 01 for receiving a control signal transmitted from the main board to provide a white light source to the liquid crystal display panel 3. For example, the light source 41 may be a light bar FPC. The light guide plate 42 may convert a side light source emitted from the light source 41 disposed at a side of the light guide plate into a surface light source so that light is emitted uniformly. The reflective sheet 43 may be disposed under the light guide plate 42 to reflect light; after the light is emitted from the light source 41 and passes through the light guide plate 42, a part of the light propagates toward one side (i.e., light-emitting side) of the liquid crystal display panel 3, and a part of the light propagates toward the side away from the liquid crystal display panel 3, enters the reflection sheet 43, and is reflected to the light-emitting side.

Optionally, when the backlight module 30 is a side-in backlight module, referring to fig. 1e, the backlight module 30 may further include a diffusion sheet 44 and a brightness enhancement film 45. The diffusion sheet 44 may be disposed at a side of the light guide plate 42 facing the liquid crystal display panel 3 for homogenizing the light emitted from the light guide plate 42 to uniformly disperse the light. The light enhancement film 45 may be provided on a side of the diffusion sheet 44 facing the liquid crystal display panel 3 for enhancing light emitted from the diffusion sheet 44.

For example, when the backlight module 30 is a direct type backlight module, as shown in fig. 1f, the backlight module 30 may also include a light source 41, a light guide plate 42, a reflective sheet 43, a diffusion sheet 44, a light enhancement film 45, and the like, similar to the side-entry type backlight module shown in fig. 1 d. The main difference from the side-entry backlight module shown in fig. 1e is that: the light source 41 is disposed at a lower portion of the backlight module 30, not at a side of the backlight module. Referring to fig. 1f, the reflective sheet 43 is disposed at the bottom of the backlight module 30, and the light source 41 is disposed at a side of the reflective sheet 43 facing the liquid crystal display panel 3.

Alternatively, when the backlight module 30 is a direct type backlight module, the light source 41 directly irradiates upward from the bottom, so that the light is emitted more uniformly, and the backlight module 30 may not be provided with the light guide plate 42.

Based on this, the display principle of the display device 01 is: the light source 41 of the backlight module 30 emits light (for example, white light), and the light is optically processed by optical components such as the light guide plate 42, the reflective sheet 43, the diffusion sheet 44, and the light enhancement film 45, and then irradiated toward the liquid crystal display panel 3, thereby forming a backlight.

The incident backlight passes through the lower polarizing layer 36 to form white polarized light with a specific polarization direction, and is incident into the array substrate 31, and then filtered by the liquid crystal layer 33 and the color filter layer to form polarized light of three primary colors of red, green and blue.

When the polarization direction of the polarized light is perpendicular to the polarization direction of the upper polarization layer 35, the polarized light cannot pass through the upper polarization layer 35, and no light exits at this time.

When the polarization direction of the polarized light is parallel to the polarization direction of the upper polarizing layer 35, the polarized light may pass through the upper polarizing layer 35 entirely, and the intensity of the outgoing light is strongest.

Since the liquid crystal molecules in the liquid crystal layer 33 have optical rotation characteristics for polarized light, a specific molecular arrangement direction may change the polarization direction of the polarized light. The polarized light direction of the liquid crystal molecules in each sub-pixel (sub-pixel) is changed through the pixel circuit on the array substrate 31, so that the included angle between the polarized light and the upper polarizing layer 35 can be controlled, and the quantity of light emitted from the upper polarizing layer 35 in each sub-pixel is controlled, so that different gray-scale images can be displayed, and the display is completed.

In order to realize the peep-proof function of the display device, in some implementations, a peep-proof film, a polymer dispersed liquid crystal film, and a transparent dimming layer may be provided in the above-described display device 01.

Regarding the placement position of the polymer dispersed liquid crystal film, in some implementations, as shown in fig. 2a, the polymer dispersed liquid crystal film 38 may be disposed on the side of the liquid crystal display panel 3 near the backlight module 30 (i.e., the back surface of the liquid crystal display panel 3).

Regarding the structure of the polymer dispersed liquid crystal film 38, exemplarily, referring to fig. 2b, the polymer dispersed liquid crystal film 38 may include a first electrode layer 51, a second electrode layer 52, and a polymer dispersed liquid crystal layer 383 sandwiched between the two electrode layers. The polymer dispersed liquid crystal layer 383 is formed by dispersing liquid crystal in small droplets on the order of microns within an organic solid polymer matrix. Due to the dielectric anisotropy properties of the liquid crystal, see fig. 2b, when the first electrode layer 51 and the second electrode layer 52 are de-energized, the optical axes of the small droplets of liquid crystal molecules are in a free orientation, the refractive index of which does not match the refractive index of the matrix, and the light rays pass through the polymer dispersed liquid crystal layer 383 and are in a scattering state. Referring to fig. 2c, after the first electrode layer 51 and the second electrode layer 52 apply an electric field, the optical axis orientation of the liquid crystal droplets can be adjusted, so that the liquid crystal molecules are orderly arranged, and the light is emitted in a specific direction after passing through the polymer dispersed liquid crystal layer 383, and the refractive index of the matrix is matched.

Regarding the location of the transparent dimming layer 39, as shown in fig. 2a, the transparent dimming layer 39 may be disposed on the side of the polymer dispersed liquid crystal film 38 away from the liquid crystal display panel 3, and the side of the transparent dimming layer 39 away from the polymer dispersed liquid crystal film 38 has a prism structure 391 for performing viewing angle contraction of incident light. Thus, the transparent dimming layer 39 having the prism structure 391 may achieve viewing angle shrinkage for incident light.

The material of the transparent dimming layer 39 is not limited in the embodiment of the present application, and the material of the transparent dimming layer 39 may be glass or other transparent materials, for example.

Here, referring to fig. 2a, since the prism structure 391 is disposed such that the apex angle of the prism is downward, the prism structure 391 is actually a kind of inverse prism structure, and thus the prism structure 391 may also be referred to as an inverse prism structure.

Referring to fig. 2d, after the light emitted from the light emitting surface of the backlight module 30 enters the prism structure 391, the prism structure 391 can concentrate the light from all directions, so that the light passes through the prism structure 391 and then is emitted in a direction perpendicular to the horizontal plane or approximately perpendicular to the horizontal plane, thereby playing a role of shrinking the viewing angle.

Regarding the shape of the prism structure 391, for simplifying the manufacturing process, exemplarily, referring to fig. 3a, the prism structure 391 may be an isosceles prism. Referring to fig. 3b, the prismatic structure 391 may be a right angle prism. Referring to fig. 3c, the prismatic structure 391 may be an isosceles right prism.

It is understood that the prism structure 391 may be any other type of prism structure, which is not limited in this application, and any prism structure that can be used to achieve the function of shrinking the viewing angle in the related art may be used as the prism structure 391.

In some embodiments, the backlight module 30 is disposed on a side of the transparent dimming layer 39 away from the lcd panel 3, the light-emitting surface of the backlight module 30 faces the transparent dimming layer 39, and the privacy film 46 is disposed on a surface of the backlight module 30 facing the transparent dimming layer 39.

Taking a direct type backlight module as an example, as shown in fig. 2a, a peep-proof film 46 may be disposed on a side of the brightness enhancement film 45 facing the lcd panel 3.

Illustratively, as shown in fig. 3d, the privacy film 46 may include a privacy fabric layer 461 and an upper protective layer 462 and a lower protective layer 463 disposed on the privacy fabric layer, respectively. The peep-proof structure layer 461 is formed by compounding a plurality of layers of materials to form an ultra-micro shutter structure 4611, the ultra-micro shutter structure 4611 is composed of parallel arranged grating structures, the interval of the gratings can be between 0.02 and 0.1mm, when light irradiates on the peep-proof film, most of the light is blocked by the gratings, and only a small part of the light which basically irradiates on the peep-proof film vertically can be reflected out from the interval, so that the visual angle can be obviously contracted, and the effects of reducing the visual range of a screen and preventing peeping are achieved.

The upper protective layer 462 and the lower protective layer 463 may support and protect the privacy structure layer 461. For example, each of the upper and lower

protective layers

462 and 463 may include a polyethylene terephthalate (polyethylene terephthalate, PET) layer, a Polyethylene (PE) layer, and the like.

In addition, referring to fig. 3d, an anti-glare (AG) layer 4621 may be further disposed in the upper protective layer 462, and the AG layer 4621 is a frosted layer having a diffuse reflection surface for preventing glare. The upper protective layer 462 has the AG layer 4621 frosted thereon, so that the surface of the privacy film 46 corresponding to the upper protective layer 462 is a matte surface. Accordingly, the surface of the privacy film 46 corresponding to the lower protection layer 463 is a smooth surface.

Typically, the privacy film 46 is positioned with the fog side facing the light exit side.

In this embodiment, the peep-proof film 46 is reversed, that is, the light surface of the peep-proof film 46 is set towards the light emitting side.

Referring to fig. 3e, when the privacy film 46 is inverted, the light surface of the privacy film 46 faces the light emitting side, i.e., the light surface of the privacy film 46 faces the prism structure 391 of the transparent dimming layer 39, and the fog surface of the privacy film 46 faces the brightness enhancement film 45. Therefore, the light surface of the peep-proof film 46 and the transparent dimming layer 39, and the fog surface of the peep-proof film 46 and the intensifying film 45 are not in direct contact with the two light surfaces of the film material, so that film wrinkling caused by light surface adsorption of the film material is avoided.

The following description will be given by taking the reverse of the peep-proof film 46 as an example, and the following description will be omitted.

Based on this, the above-mentioned display device 01 with the added peep-proof film 46, polymer dispersed liquid crystal film 38 and transparent dimming layer 39 has the following peep-proof display principle: the light source 41 of the backlight module 30 emits light, and the light enters the peep-proof film 46 after being optically processed by the light guide plate 42, the reflecting sheet 43, the diffusion sheet 44 and the light enhancement film 45, and the peep-proof film 46 can block part of the light, so that only part of the light basically perpendicularly irradiated on the peep-proof film is emitted towards the liquid crystal display panel 3, the effect of shrinking the viewing angle is achieved, and the backlight filtered by the peep-proof film is formed.

Then, the filtered backlight concentrates the light through the prism structure 391 of the transparent dimming layer 39, further shrinking the viewing angle, and then the light is incident on the polymer dispersed liquid crystal film 38. Referring to fig. 4a, when the polymer dispersed liquid crystal film 38 is powered off, liquid crystal molecules in the polymer dispersed liquid crystal film 38 are freely oriented, and light rays are in a scattering state after passing through the polymer dispersed liquid crystal film 38; that is, the light concentrated through the prism structure 391 is re-dispersed, and the effect of shrinking the viewing angle is eliminated, so that there is no peep preventing effect. Referring to fig. 4b, when the polymer dispersed liquid crystal film 38 is energized, the liquid crystal molecules in the polymer dispersed liquid crystal film 38 can be orderly arranged along the vertical direction, so that the light is emitted along the vertical direction after passing through the polymer dispersed liquid crystal film 38, and the peep-proof effect is achieved.

Accordingly, for the display device provided in the embodiment of the present application, the on and off of the peep preventing function of the display device can be controlled by controlling the power on and off of the polymer dispersed liquid crystal film 38, and the power on and off of the polymer dispersed liquid crystal film 38 can be controlled by the timing chart of the voltages between the first electrode layer 51 and the second electrode layer 52 as shown in fig. 4 c.

Wherein, in the period in which the voltage between the first electrode layer 51 and the second electrode layer 52 is 0, i.e., the off period shown in fig. 4c, the polymer dispersed liquid crystal film 38 is powered off, corresponding to the shared state light path diagram shown in fig. 4a, the light rays are in a scattering state after passing through the polymer dispersed liquid crystal film 38, and no peep preventing effect is provided. In the period in which the voltage between the first electrode layer 51 and the second electrode layer 52 is V, that is, the on period shown in fig. 4c, the polymer dispersed liquid crystal film 38 is energized, corresponding to the peep-preventing state light path diagram shown in fig. 4b, the light is emitted in the vertical direction after passing through the polymer dispersed liquid crystal film 38, so as to achieve the peep-preventing effect.

Therefore, when the peep preventing function is turned on (i.e., the polymer dispersed liquid crystal film 38 is energized), the light from the light source 41 of the backlight module 30 passes through the peep preventing film 46, and according to the peep preventing principle of the peep preventing film 46, only a part of the light substantially perpendicularly irradiated on the peep preventing film 46 is emitted toward the liquid crystal display panel 3 by the peep preventing film 46, and the rest of the light is filtered, thereby playing a role of shrinking the viewing angle. Then, the light passes through the transparent dimming layer 39, and the prism structure 391 in the transparent dimming layer 39 has the effect of shrinking the viewing angle of the incident light, so that the light passes through the transparent dimming layer 39 and is further shrunk in viewing angle; light is then emitted in the vertical direction after entering the energized polymer dispersed liquid crystal film 38, thereby achieving a good privacy effect.

Further, when the peep-proof function is turned on, the light emitted in the vertical direction after passing through the polymer dispersed liquid crystal film 38 passes through the lower polarizing layer 36 to form white polarized light with a specific polarization direction, and the white polarized light is incident into the array substrate 31 and filtered by the liquid crystal layer 33 and the color filter layer to form polarized light of three primary colors of red, green and blue.

Hereinafter, a display device provided in the embodiments of the present application will be described in several detailed embodiments.

Example 1

In order to realize the peep-proof function of the display device, the display device may be a display device 01 including a peep-proof film 46, a polymer dispersed liquid crystal film 38, and a transparent dimming layer 39 as shown in fig. 2 a.

Referring to fig. 2a, the display device 01 includes a liquid crystal display panel 3, a polymer dispersed liquid crystal film 38, a transparent dimming layer 39, and a backlight module 30.

The liquid crystal display panel 3 has a display surface and a back surface opposite to the display surface.

The polymer dispersed liquid crystal film 38 is provided on the back surface of the liquid crystal display panel 3. The polymer dispersed liquid crystal film 38 may be a flexible, electrically conductive film, with two electrode layers integrated into the polymer dispersed liquid crystal film 38 for controlling the deflection of liquid crystal molecules in the polymer dispersed liquid crystal film 38.

Illustratively, referring to FIG. 2b, the polymer dispersed liquid crystal film 38 includes a first electrode layer 51, a second electrode layer 52, and a polymer dispersed liquid crystal layer 383 sandwiched between the two transparent conductive films.

Wherein the polymer dispersed liquid crystal layer 383 rotates under the driving of the first electrode layer 51 and the second electrode layer 52; that is, the first electrode layer 51 and the second electrode layer 52 are two electrode layers for controlling the deflection of the liquid crystal molecules in the polymer dispersed liquid crystal layer 383.

In manufacturing the polymer dispersed liquid crystal film 38, the leads of the two electrode layers may be laminated (e.g., high temperature laminated) with the polymer dispersed liquid crystal layer 383 to form the polymer dispersed liquid crystal film 38. The pins are electrically connected with a main board of the display device 01 through a flexible circuit board (flexible printed circuit, FPC) and receive signals transmitted by the main board so as to control the power on or power off of the two electrode layers, thereby controlling the deflection of liquid crystal molecules in the polymer dispersed liquid crystal film 38 and playing a role in controlling the opening and closing of the peep-proof function.

The structure of the polymer dispersed liquid crystal film 38 is described above by way of example only, and it is understood that the polymer dispersed liquid crystal film 38 may be any polymer dispersed liquid crystal film used in the related art for achieving light adjustment by controlling liquid crystal deflection. The polymer dispersed liquid crystal film 38 may be a flexible, electrically conductive film, with electrodes integrated into the polymer dispersed liquid crystal film 38 for controlling the deflection of liquid crystal molecules in the polymer dispersed liquid crystal film 38.

Referring to fig. 2a, the transparent dimming layer 39 is disposed on a side of the polymer dispersed liquid crystal film 38 away from the liquid crystal display panel 3; the transparent dimming layer 39 has a prism structure 391 on a side away from the polymer dispersed liquid crystal film 38, and the prism structure 391 is used for performing viewing angle contraction on incident light.

The backlight module 30 is disposed on a side of the transparent dimming layer 39 away from the lcd panel 3, and a light emitting surface of the backlight module 30 faces the transparent dimming layer 39; the surface of the backlight module 30 facing the transparent dimming layer 39 is provided with a peep-proof film 46.

In the present embodiment, the display device 01 includes the peep-proof film 46, the polymer dispersed liquid crystal film 38 and the transparent dimming layer 39, and when the peep-proof function is turned on (i.e. when the polymer dispersed liquid crystal film 38 is powered on), the light emitted from the light source 41 of the backlight module 30 passes through the peep-proof film 46 to shrink the viewing angle. Then, the light emitted from the peep-proof film 46 passes through the transparent dimming layer 39 having the prism structure 391 and is further contracted in view angle; the light emitted from the transparent dimming layer 39 enters the energized polymer dispersed liquid crystal film 38 and then is emitted in the vertical direction, so that a better peep-proof effect is achieved.

Example two

The second embodiment is the same as the first embodiment in that: the display device comprises a peep-proof film, a polymer dispersed liquid crystal film and a transparent dimming layer.

The second embodiment is different from the first embodiment in that: two electrode layers of the polymer dispersed liquid crystal film for controlling deflection of liquid crystal molecules in the polymer dispersed liquid crystal layer may be disposed on a side of the transparent dimming layer facing the liquid crystal display panel.

In some implementations, referring to fig. 5a, the polymer dispersed liquid crystal film 38 includes a polymer dispersed liquid crystal layer 383 and two electrode layers 500 disposed on a side of the transparent dimming layer 39 facing the liquid crystal display panel 3.

In addition, an alignment layer may be provided on a side of the two electrode layers 500 facing the polymer dispersed liquid crystal layer 383, and an alignment layer may be provided on a side of the liquid crystal display panel 3 facing the polymer dispersed liquid crystal layer 383 for aligning the polymer dispersed liquid crystal layer 383. For example, the alignment layer may be a material such as Polyimide (PI), or may be another material having a barrier function in the related art, which is not limited in this application. The two alignment layers may be brought together by the sealant 54 so as to define the polymer dispersed liquid crystal layer 383 within the area enclosed by the sealant 54.

Referring to fig. 5b, the two electrode layers 500 include a first electrode layer 51 and a second electrode layer 52. The first electrode layer 51 may include a plurality of first stripe-shaped electrodes 510, and the second electrode layer 52 may include a plurality of second stripe-shaped electrodes 520, and the first stripe-shaped electrodes 510 and the second stripe-shaped electrodes 520 are spaced apart.

In some implementations, the first electrode layer 51 and the second electrode layer 52 may be provided in the same layer. In other implementations, the first electrode layer 51 and the second electrode layer 52 may also be provided in different layers. Referring to fig. 5c, the two electrode layers 500 include a first electrode layer 51 and a second electrode layer 52. The first electrode layer 51 is disposed away from the transparent dimming layer 39 with respect to the second electrode layer 52. Wherein the first electrode layer 51 includes a plurality of first stripe-shaped electrodes; the second electrode layer 52 includes a plurality of second stripe-shaped electrodes. Alternatively, referring to fig. 5d, the first electrode layer 51 is in a planar shape, and the second electrode layer 52 includes a plurality of first stripe-shaped electrodes 520. Compared with the strip electrode, the planar electrode has simpler manufacturing process and can save manufacturing cost.

It will be appreciated that an insulating layer is also provided between the first electrode layer 51 and the second electrode layer 52 for insulating the first electrode layer 51 and the second electrode layer 52.

The first electrode layer 51 and the second electrode layer 52 may be transparent electrode layers, for example, electrode layers made of indium-tin oxide (ITO). It is understood that the first electrode layer 51 and the second electrode layer 52 may be electrode layers made of other conductive materials, and the materials of the first electrode layer 51 and the second electrode layer 52 are not limited in this embodiment.

Alternatively, referring to fig. 5e, the display device may further include a transparent spacer layer 310, and the transparent spacer layer 310 may be disposed between the liquid crystal display panel 3 and the polymer dispersed liquid crystal film 383. For example, the material of the transparent spacer layer 310 may be glass, and it is understood that other transparent materials in the related art may be used, which is not limited in this application.

The transparent spacer layer 310 and the liquid crystal display panel 3 may be bonded together by adhesion. For example, a transparent adhesive layer may be provided between the transparent spacer layer 310 and the liquid crystal display panel 3 for bonding the transparent spacer layer 310 and the liquid crystal display panel 3.

By providing the transparent spacer layer 310 bonded to the liquid crystal display panel 3, rainbow marks caused by adsorption generated when the lower polarizing layer 36 provided at the bottom of the liquid crystal display panel 3 and the polymer dispersed liquid crystal film 38 are in direct contact in the related art can be avoided. When two transparent light surfaces are attached, the rainbow patterns are optical interference patterns generated by air inclusion, and are usually represented as bright and dark colored concentric rings, which can have adverse effects on light transmittance and display.

In addition, referring to fig. 5f, the liquid crystal display panel 3 includes a display area a and a peripheral area B located at the periphery of the display area. The transparent dimming layer 39 comprises a peep-proof region a and a binding region b; the peep-proof area a is opposite to the display area A, the peep-proof area a is opposite to the polymer dispersed liquid crystal layer 383, and the binding area B is opposite to the peripheral area B.

The display device 01 further includes pins 63 of two electrode layers and a main board 400; the pins 63 are located in the bonding area b for transmitting control signals on the motherboard 400 to the polymer dispersed liquid crystal film to control the deflection of the polymer dispersed liquid crystal layer 383. For example, referring to fig. 5f, FPC 64 is bonded at pins 63, which FPC 64 may then be connected to motherboard 400 (e.g., a PCB board) to transmit control signals on motherboard 400 to the two electrode layers via FPC 64 to control deflection of polymer dispersed liquid crystal layer 383.

By manufacturing the two electrode layers on the transparent dimming layer 39, and the peep-proof area a of the transparent dimming layer 39 is opposite to the polymer dispersed liquid crystal layer 383, the pins 63 of the two electrode layers are led out in the binding area b, so that the pins 63 can not contact and press the polymer dispersed liquid crystal layer 383 during packaging, and the problem of failure of the liquid crystal at the pin position in a reliable environment is avoided. The reliability refers to the ability of the product to maintain normal operation after a period of operation during use. Since it is difficult for a manufacturer to observe the product's operational ability over a long period of time according to strict standards of reliability when testing the reliability of the product, alternatively, the reliability may be tested by using extreme environments (e.g., high temperature, high humidity, and/or frequent powering on and off, etc.). Thus, a trusted environment may also refer to the extreme environments described above.

Example III

The third embodiment is the same as the second embodiment in that: the display device comprises a peep-proof film, a polymer dispersed liquid crystal film, a transparent dimming layer, pins and a main board.

The third embodiment is different from the second embodiment in that: the display device includes a transparent spacer layer, and two electrode layers of a polymer dispersed liquid crystal film for controlling deflection of liquid crystal molecules in the polymer dispersed liquid crystal layer are disposed on the transparent dimming layer and the transparent spacer layer, respectively.

Referring to fig. 5g, when the display device includes the transparent spacer layer 310, the first electrode layer 51 may be disposed on a surface of the transparent spacer layer 310 facing the transparent dimming layer 39, and the second electrode layer 52 may be disposed on a surface of the transparent dimming layer 39 facing the transparent spacer layer 310.

Wherein, the shape of the first electrode layer 51 may be a strip shape; alternatively, the first electrode layer 51 may have a planar shape. The shape of the first electrode layer 51 is not particularly limited in the embodiment of the present application.

By disposing the first electrode layer 51 and the second electrode layer 52 on the surfaces of the transparent spacer layer 38 and the transparent dimming layer 39, respectively, compared with the scheme in which both the first electrode layer 51 and the second electrode layer 52 are disposed on the transparent dimming layer 39, an electric field passing straight through the polymer dispersed liquid crystal layer 383 can be generated between the first electrode layer 51 and the second electrode layer 52, which is easier to regulate the electric field.

In addition, the display device may further include a transparent adhesive layer. A transparent adhesive layer may be disposed between the transparent spacer layer 310 and the liquid crystal display panel 3 for bonding the transparent spacer layer 310 and the liquid crystal display panel 3. The transparent spacer layer 310 is bonded to the liquid crystal display panel 3 through a transparent adhesive layer, so that rainbow marks caused by adsorption generated when the lower polarizing layer 36 disposed at the bottom of the liquid crystal display panel 3 is in direct contact with the polymer dispersed liquid crystal film 38 in the related art can be avoided.

In addition, the display device may further include a sealant 54 disposed between the transparent spacer layer 310 and the transparent dimming layer 39 and located at the periphery of the polymer dispersed liquid crystal layer 383. Also, referring to fig. 5g, a first isolation layer 511 may be disposed between the transparent spacer layer 310 and the polymer dispersed liquid crystal layer 383 for electrically isolating between the transparent spacer layer 310 and the polymer dispersed liquid crystal layer 383. A second isolation layer 512 may be disposed between the second electrode layer 52 and the polymer dispersed liquid crystal layer 383 for electrically isolating the second electrode layer 52 from the polymer dispersed liquid crystal layer 383. An alignment layer may be disposed on a side of the first barrier layer 511 facing the polymer dispersed liquid crystal layer 383, and an alignment layer may be disposed on a side of the second barrier layer 512 facing the polymer dispersed liquid crystal layer 383, both alignment layers being used to align the polymer dispersed liquid crystal layer 383. For example, the alignment layer may be a material such as Polyimide (PI), or may be another material having a barrier function in the related art, which is not limited in this application. Therefore, the sealant disposed between the transparent spacer layer 310 and the transparent dimming layer 39 and surrounding the polymer dispersed liquid crystal layer 383 is actually disposed between the two alignment layers and surrounds the polymer dispersed liquid crystal layer 383.

The first isolation layer 511 and the second isolation layer 512 may be, for example, silicon nitride, silicon oxide, or other materials having an isolation function in the related art, which is not limited in this application.

The method for manufacturing the display device according to the third embodiment may include the steps of:

first, the liquid crystal cell is manufactured by using the related art process, and the liquid crystal cell is cut to form the liquid crystal display 20 as shown in fig. 1 c. Then, as shown in fig. 6a, upper and lower

polarizing layers

35 and 36 are respectively attached to the upper and lower surfaces of the liquid crystal display 20, or the upper and lower

polarizing layers

35 and 36 are formed by plating. Through this step, the first structure 601 (i.e., the liquid crystal display panel 3) is formed.

Referring to fig. 6b, a transparent spacer layer 310 is made of glass or other transparent material, and a transparent conductive material is coated on one surface of the transparent spacer layer 310 to form a first electrode layer 51. Then, a first isolation layer 511 is coated on the first electrode layer 51, and the material of the first isolation layer 511 may be silicon nitride, silicon oxide, or the like. Through this step, a second structure 602 is formed.

Referring to fig. 6c, glass or other transparent material is used as the transparent dimming layer 39, and a transparent conductive material is coated on one surface of the transparent dimming layer 39 to form the second electrode layer 52. Then, a second isolation layer 512 is coated on the second electrode layer 52, and a material of the second isolation layer 512 may be silicon nitride, silicon oxide, or the like. Then, a prism structure 391 is formed on the other surface of the transparent dimming layer 39 by a machining process. Through this step, a third structure 603 is formed.

Referring to fig. 6d, polyimide (PI) is coated on the first isolation layer 511 of the second structure 602 and the second isolation layer 512 of the third structure 603, respectively, for alignment. Then, a sealant 54 is coated between the sides of the aligned third structure 603 where the second isolation layer 512 is located and a polymer dispersed liquid crystal solution containing liquid crystal is dropped into the sealant 54 to form a polymer dispersed liquid crystal layer 383 and assembled into a box, and referring to fig. 6d, the whole structure assembled into the box may be referred to as a dimming board 6, and the dimming board 6 includes a structure composed of the second structure 602, the third structure 603, the sealant 54, the polymer dispersed liquid crystal layer 383, and PI together. After that, the leads 63 of the first electrode layer 51 and the second electrode layer 52 are led out for subsequent binding of the FPC. The pins 63 may be fabricated on each layer of substrate that needs to be pressed with the FPC before the packaging, for example, the fabrication method of the pins 63 on each layer of substrate may be similar to the method of fabricating electrode pins of the liquid crystal display panel in the related art, and the pins 63 may be led out by other manners in the related art, which will not be described herein. In some implementations, the substrates of each layer may be conducted by a silver paste spot method, or may be conducted by other methods in the related art, which is not limited in this embodiment of the present application.

The light modulation plate 6 is attached to one side of the first structure 601 close to the lower polarizing layer 36, and the first structure 601 and the light modulation plate 6 are assembled to obtain a fourth structure 604 shown in fig. 6 e.

The backlight module 30 is assembled in a conventional manner in the related art, wherein the privacy film 46 is disposed at the uppermost layer of the light emitting side of the backlight module 30 and is inverted, and the light surface faces upward, for example, the assembled backlight module 30 may be the backlight module 30 in fig. 2 a.

Then, for example, an integrated circuit (integrated circuit, IC) is packaged On the FPC using a Chip On Film (COF) technology, so that the IC is electrically connected to the main board 400 of the display device 01 through the FPC, receiving signals transmitted from the main board 400. In packaging the IC onto the FPC, referring to fig. 5f, the FPC 64 may be bonded at pins 63, which FPC 64 may then be connected to a motherboard 400 (e.g., a PCB board) so that control signals on the motherboard 400 are transmitted via the FPC 64 to the two electrode layers (i.e., the first electrode layer 51 and the second electrode layer 52) comprised by the polymer dispersed liquid crystal film to control deflection of the polymer dispersed liquid crystal layer 383.

Finally, the fourth structure 604 and the backlight module 30 are encapsulated by using the housing 50 and the cover plate 10, and the display device 01 with peep-proof function shown in fig. 6f is obtained.

To sum up, the display device 01 provided in this embodiment of the present application firstly contracts light through the peep-proof film 46, then, the transparent dimming layer 39 is disposed on one side of the polymer dispersed liquid crystal film 38 far away from the liquid crystal display panel, and the prism structure 391 is disposed on one side of the transparent dimming layer 39 near the light emitting side, so that the light passing through the peep-proof film 46 to contract the viewing angle is further contracted, and thus a better peep-proof effect can be achieved.

In addition, by reversely arranging the peep-proof films, the film wrinkling caused by the smooth surface adsorption of the two film materials is avoided. Also, by disposing both electrodes for controlling the deflection of the liquid crystal in the polymer dispersed liquid crystal film 38 at the transparent dimming layer 39, or at the transparent dimming layer 39 and the transparent spacer layer 310, respectively, and drawing out the pins of the electrodes, the problem of failure of the liquid crystal at the pin positions occurring in a reliable environment is avoided. Further, by providing the spacer layer, rainbow marks caused by adsorption generated when the lower polarizing layer 36 provided at the bottom of the liquid crystal display panel 3 and the polymer dispersed liquid crystal film 38 are in direct contact in the related art are also avoided.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A display device, comprising:

a liquid crystal display panel having a display surface and a back surface opposite to the display surface;

a polymer dispersed liquid crystal film disposed on the back surface of the liquid crystal display panel;

a transparent spacer layer disposed between the liquid crystal display panel and the polymer dispersed liquid crystal film for avoiding adsorption of the liquid crystal display panel and the polymer dispersed liquid crystal film;

the transparent dimming layer is arranged on one side of the polymer dispersed liquid crystal film far away from the liquid crystal display panel; the transparent dimming layer is provided with a prism structure at one side far away from the polymer dispersed liquid crystal film, and the prism structure is used for performing visual angle contraction on incident light rays;

the backlight module is arranged on one side of the transparent dimming layer far away from the liquid crystal display panel, and the light emergent surface of the backlight module faces the transparent dimming layer; the surface of the backlight module, which faces the transparent dimming layer, is provided with a peep-proof film.

2. The display device of claim 1, wherein the privacy film has a light surface that faces the transparent dimming layer.

3. The display device according to claim 1, wherein the polymer-dispersed liquid crystal film includes a first electrode layer, a second electrode layer, and a polymer-dispersed liquid crystal layer that rotates under driving of the first electrode layer and the second electrode layer;

The first electrode layer and the second electrode layer are both arranged on the surface of the transparent dimming layer, which faces the liquid crystal display panel.

4. A display device according to claim 3, further comprising a transparent glue layer;

the transparent adhesive layer is arranged between the transparent spacer layer and the liquid crystal display panel and is used for bonding the transparent spacer layer and the liquid crystal display panel.

5. The display device according to claim 1, wherein the polymer-dispersed liquid crystal film includes a first electrode layer, a second electrode layer, and a polymer-dispersed liquid crystal layer that rotates under driving of the first electrode layer and the second electrode layer;

the first electrode layer is arranged on the surface of the transparent spacer layer, which faces the transparent dimming layer, and the second electrode layer is arranged on the surface of the transparent dimming layer, which faces the transparent spacer layer.

6. The display device of claim 5, further comprising a transparent glue layer;

7. The display device according to any one of claims 3 to 6, wherein the first electrode layer has a planar shape.

8. The display device of any one of claims 4-6, further comprising a frame sealant disposed between the transparent spacer layer and the transparent dimming layer and located at a periphery of the polymer dispersed liquid crystal layer.

9. The display device according to any one of claims 3 to 6, wherein the liquid crystal display panel includes a display region and a peripheral region located at a periphery of the display region;

the transparent dimming layer comprises a peep-proof area and a binding area; the peep-proof area is opposite to the display area, and the binding area is opposite to the peripheral area;

the display device also comprises pins and a main board; the pins are located in the binding area and used for transmitting control signals on the main board to the polymer dispersed liquid crystal film so as to control deflection of the polymer dispersed liquid crystal layer.

10. The display device of any one of claims 1-6, wherein the prismatic structure is an isosceles prism.