CN114518673A - Peep-proof display device and control method and preparation method thereof - Google Patents

Abstract

The invention provides a peep-proof display device, a control method and a preparation method thereof, and relates to the technical field of display. This peep-proof display device includes: the display device comprises a dimming structure, a display panel and adhesive, wherein the dimming structure is attached to the display panel through the adhesive; the light modulation structure comprises a first electrode, a second electrode and a liquid crystal layer; the liquid crystal layer is disposed between the first electrode and the second electrode; the liquid crystal layer is configured to have no scattering effect on light when a voltage is applied and to have a scattering effect on light when a voltage is not applied.

Description

Peep-proof display device and control method and preparation method thereof

Technical Field

The invention relates to the technical field of display, in particular to a peep-proof display device and a control method and a preparation method thereof.

Background

With the popularization of mobile devices such as mobile computers and tablets, more and more users prefer to use the mobile devices in public places such as subways and high-speed rails. In the process of using the mobile device in a public place, privacy leakage is easily caused due to the problems of wide viewing angle and the like of the current mobile device, so that the mobile device needs to have a peep-proof function to prevent information leakage.

However, the current mobile device with the peeping prevention function can only achieve peeping prevention in the horizontal direction, and the mobile device cannot prevent peeping in the vertical direction, so that the peeping prevention effect is poor.

Disclosure of Invention

The embodiment of the invention provides a peep-proof display device, a control method and a preparation method thereof, wherein the peep-proof display device can simultaneously realize peep-proof in the horizontal direction and the vertical direction, so that the peep-proof effect is improved.

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

in one aspect, a peep-proof display device, a control method and a preparation method thereof are provided, the peep-proof display device comprising: the display device comprises a dimming structure, a display panel and adhesive, wherein the dimming structure is attached to the display panel through the adhesive;

the light modulation structure comprises a first electrode, a second electrode and a liquid crystal layer; the liquid crystal layer is disposed between the first electrode and the second electrode; the liquid crystal layer is configured to have no scattering effect on light when a voltage is applied and to have a scattering effect on light when a voltage is not applied.

Optionally, the liquid crystal layer comprises polymer dispersed liquid crystal.

Optionally, the display panel at least includes a first polarizer;

The light adjusting structure is attached to the first polarizer through the adhesive.

Optionally, the privacy display device further comprises a backlight structure, wherein the backlight structure comprises an adhesive layer;

the light adjusting structure is arranged between the first polaroid and the backlight structure and is fixed with the backlight structure through the bonding layer.

Optionally, the adhesive comprises a pressure sensitive adhesive or a liquid optical adhesive.

Optionally, the thickness range of the adhesive glue along the direction perpendicular to the dimming structure includes 1-30 um.

Optionally, the thickness of the liquid crystal layer in a direction perpendicular to the dimming structure is 0.2-0.5 mm.

Optionally, the peep-proof display device further comprises a first protection part and a second protection part;

the first protection part is arranged on one side of the adhesive glue, which is far away from the dimming structure;

the second protection part is arranged on one side, far away from the adhesive glue, of the dimming structure.

Optionally, the peep-proof display device further includes a control structure, and the control structure is electrically connected to the first electrode and the second electrode respectively; the control structure is configured to provide a control voltage to the first electrode and the second electrode such that the liquid crystal layer of the dimming structure has no diverging effect on light.

In another aspect, a control method of the above peep-proof display device is provided, where the peep-proof display device includes a dimming structure including a first electrode, a second electrode, and a liquid crystal layer; the peep-proof display device also comprises a control structure; the control structure is electrically connected with the first electrode and the second electrode respectively;

the control method comprises the following steps:

opening the control structure, and providing a control voltage to the first electrode and the second electrode, so that the liquid crystal layer has no diffusion effect on light, and the peep-proof display device is in a peep-proof state;

and closing the control structure to enable the peep-proof display device to be switched from a peep-proof state to a non-peep-proof state.

In another aspect, a method for manufacturing the above peep-proof display device is provided, where the method includes:

providing a dimming structure matrix and a display panel; wherein the dimming structure precursor comprises a plurality of dimming structures;

coating an adhesive layer on one side of the light adjusting structure matrix;

attaching a first protective layer to one side of the bonding layer, which is far away from the dimming structure matrix, so as to form a dimming structure film;

cutting the dimming structure film along a preset cutting line to form a plurality of dimming structure sub-films; wherein the dimming structure sub-film comprises a dimming structure, adhesive glue and a first protection part;

Tearing off the first protection part;

and attaching the adhesive to the display panel.

The embodiment of the invention provides a peep-proof display device, which comprises a dimming structure, a display panel and adhesive glue, wherein the dimming structure is attached to the display panel through the adhesive glue; the light modulation structure comprises a first electrode, a second electrode and a liquid crystal layer; the liquid crystal layer is arranged between the first electrode and the second electrode; the liquid crystal layer is configured to have no scattering effect on light when a voltage is applied and to have a scattering effect on light when a voltage is not applied. Therefore, the dimming structure is applied to the peep-proof display device, and on one hand, the peep-proof display device can have a peep-proof state and a non-peep-proof state by controlling the liquid crystal layer; on the other hand, the peep prevention of the upper and lower four directions of the horizontal direction and the vertical direction of the peep prevention display device can be simultaneously realized, so that the peep prevention effect is greatly improved.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a peep-proof device in the related art according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a peep-proof display device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a dimming structure according to an embodiment of the present invention;

fig. 4 is a diagram of an actual product in which a light modulation structure and a display panel are bonded by an adhesive according to an embodiment of the present invention;

fig. 5 is a diagram of an actual product formed by applying an adhesive on a PDLC according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a PDLC in a power-on state according to an embodiment of the present invention;

fig. 7 is a diagram of an actual product of a PDLC in a power-on state according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a PDLC in an unpowered state according to an embodiment of the present invention;

Fig. 9 is a diagram of an actual product of a PDLC in a non-power-on state according to an embodiment of the present invention;

fig. 10 is a diagram of a PDLC warped actual product according to an embodiment of the present invention;

fig. 11 is a flowchart of a manufacturing process for bonding a solid OCA glue and a PDLC according to an embodiment of the present invention;

fig. 12 is a flowchart of a manufacturing process of the peep-proof display device according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the embodiments of the present invention, the terms "first", "second", and the like are used for distinguishing identical items or similar items having substantially the same functions and actions, and are used only for clearly describing technical solutions of the embodiments of the present invention, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

In the embodiments of the present invention, "a plurality" means two or more unless specifically defined otherwise.

At present, the peep-proof device on the market usually realizes peep-proof through the attachment of an upper liquid crystal box and a lower liquid crystal box, as shown in fig. 1. Referring to fig. 1, the peep-proof device includes a display screen 1 and a peep-proof substrate 2, wherein the display screen 1 includes a lower display Polarizer 11(Polarizer, abbreviated as POL), a liquid crystal display substrate 12(Thin Film Transistor Panel, abbreviated as TFT Panel), and an upper display Polarizer 13 (the upper display Polarizer 13 is attached to a side of a color Film layer of the display substrate 1 far from the lower display Polarizer 11, and is also referred to as color Film Polarizer, abbreviated as CF POL) stacked in sequence. The peep-proof substrate 2 comprises a peep-proof lower polarizer 21, a peep-proof liquid crystal substrate 22 and a peep-proof upper polarizer 23 which are sequentially stacked. Referring to fig. 1, a display screen 1 and a privacy substrate 2 are attached by an adhesive 3. Referring to fig. 1, a backlight module 4 is further disposed on a side of the display screen 1 away from the peep-proof substrate 2.

However, this privacy screen has several drawbacks: 1. the peep-proof screen can only realize peep-proof on the left side and the right side, and cannot realize peep-proof on the upper side, the lower side, the left side and the right side. 2. Because the display substrate 1 and the peep-proof substrate 2 are both liquid crystal substrates, the process flow for bonding the two liquid crystal substrates is very complicated, and the production cost is high; 3. the two liquid crystal substrates are attached together, so that the thickness of the product cannot be reduced, and the light and thin whole product cannot be realized.

Based on this, an embodiment of the present invention provides a privacy display apparatus, as shown in fig. 2, the privacy display apparatus includes: the light modulation structure 5, the display panel 6 and the adhesive 7, wherein the light modulation structure 5 and the display panel 6 are attached through the adhesive 7.

Referring to fig. 3, the dimming structure 5 includes a first electrode 51, a second electrode 52, and a liquid crystal layer 53; the liquid crystal layer 53 is provided between the first electrode 51 and the second electrode 52; the liquid crystal layer 53 is configured to have no diffusing action on light when a voltage is applied and to have a diffusing action on light when a voltage is not applied.

The specific structure of the dimming structure is not limited herein. For example, the dimming structure may include a first electrode, a liquid crystal layer, and a second electrode sequentially stacked; alternatively, the dimming structure may include a first protection part, a first electrode, a liquid crystal layer, a second electrode, and a second protection part, which are sequentially stacked; alternatively, the dimming structure may include a first electrode, a liquid crystal layer, a second electrode, and a first protection portion, which are sequentially stacked. Fig. 3 illustrates an example of the light modulation structure including a first protection portion 30, a first electrode 51, a liquid crystal layer 53, a second electrode 52, and a second protection portion 31, which are sequentially stacked, wherein the second protection portion 31 and the light modulation structure 5 are attached by an adhesive 7.

The Display panel may include an LCD (Liquid Crystal Display), or may include an OLED (Organic Light-Emitting Diode) Display panel, which is not limited herein. Here, the specific structure of the display panel is not limited. Illustratively, referring to fig. 2, the display panel 6 includes a first polarizer 61, a display substrate 62, and a second polarizer 63, which are sequentially stacked.

The specific type of the adhesive is not limited herein. Illustratively, the adhesive may comprise a pressure sensitive adhesive or a liquid optical adhesive.

The dimming structure is attached to the display panel through adhesive glue. The specific arrangement positions of the dimming structure and the display panel are not limited herein. For example, the dimming structure may be disposed on the light emitting side of the display panel, for example, the dimming structure is disposed on the light emitting side of the LCD or OLED; alternatively, the dimming structure may be disposed at the light incident side of the display panel, for example, between the display panel and the backlight structure in an LCD, as shown in fig. 2. In order to avoid the influence of polarizers in the display panel on the light of the light modulating structure, the light modulating structure is preferably arranged between the display panel 6 and the backlight structure 8 as shown in fig. 2. Referring to fig. 2, the light modulating structure 5 and the backlight structure 8 are attached by an adhesive 3.

Here, the shape, material, and the like of the first electrode and the second electrode are not particularly limited. For example, the first electrode and the second electrode may each include a strip electrode made of metal; alternatively, the first electrode and the second electrode may each include a planar electrode made of metal.

Here, the material of the liquid crystal layer is not particularly limited. As an example, the material of the Liquid Crystal layer may include PDLC (Polymer Dispersed Liquid Crystal).

Fig. 4 shows an actual product diagram in which the dimming structure and the display panel are attached by the adhesive.

In the peep-proof display device provided by the embodiment of the invention, the dimming structure is attached to the display panel through the adhesive; the dimming structure includes a first electrode, a second electrode, and a liquid crystal layer disposed between the first electrode and the second electrode, the liquid crystal layer being configured to have no diverging effect on light when a voltage is applied and to have a diverging effect on light when no voltage is applied. After the dimming structure provided by the embodiment is applied to the peep-proof display device, under the condition that voltage is applied to the liquid crystal layer, the peep-proof display device is seen from the left side and the right side of the peep-proof display device along the horizontal direction and from the upper side and the lower side of the peep-proof display device along the vertical direction, and due to the fact that the dimming structure prevents light rays from dispersing all around, display pictures cannot be basically seen all around, and therefore the peep-proof display device is in a peep-proof state. When no voltage is applied to the liquid crystal layer, the display screen can be viewed from the upper, lower, left, right, and the like directions of the privacy display device, and the privacy display device does not provide privacy. That is, the dimming structure is applied to the privacy display device, and on one hand, the privacy display device can have a privacy state and a non-privacy state by controlling the liquid crystal layer; on the other hand, the peep prevention of the upper and lower four directions of the horizontal direction and the vertical direction of the peep prevention display device can be simultaneously realized, so that the peep prevention effect is greatly improved.

Optionally, the liquid crystal layer comprises polymer dispersed liquid crystal.

The polymer Dispersed Liquid crystal, also called pdlc (polymer Dispersed Liquid crystal), is shown in fig. 3, in which Liquid crystal 531 is Dispersed in a matrix of organic solid polymer 532 in small droplets of micron order. Since the optical axis of the small droplets composed of liquid crystal molecules is in a free orientation, the refractive index thereof is not matched with that of the matrix, and light is strongly scattered by the droplets while passing through the matrix to assume an opaque milky white state or a translucent state. Application of an electric field can adjust the optical axis orientation of the liquid crystal droplets, which when index matched, appear transparent. The electric field is removed and the liquid crystal droplets restore the original state of astigmatism, thereby performing the display. That is, the main expression of the polymer dispersed liquid crystal is transparency and non-transparency (the same effect as the matte peeling), and the transparency thereof is controlled by voltage adjustment.

The actual product formed by applying the adhesive on the PDLC is shown in fig. 5.

The privacy principle of the PDLC is explained in detail below.

When the PDLC is in a powered state: referring to fig. 6 and 7, when an external voltage is applied to the PDLC, the PDLC is transparent and has no scattering effect on the light L1, that is, the PDLC is transparent when the voltage is applied, so that the light L1 is prevented from being scattered around, the display on the screen cannot be normally seen around, the display can be normally seen only at a viewing angle perpendicular to the screen, and the light L1 vertically passes through the PDLC. At this time, the peep-proof display device is in a peep-proof state, namely the peep-proof display device is visible at a specific visual angle in front view, and the display content of the screen cannot be observed within the range of 45 degrees from left to right, up and down.

When the PDLC is in a non-energized state: referring to fig. 8 and 9, when no voltage is applied to the PDLC, the polymer liquid crystal in the PDLC is in a disordered arrangement state, that is, when no voltage is applied, the PDLC is in an off state, and the light L2 is no longer blocked, so that the PDLC is in a semitransparent state, and the light L2 is strongly scattered, and the scattered light normally penetrates through the privacy display device. At this time, the privacy display apparatus is in a non-privacy state (a sharing state), i.e., each viewing angle is visible.

Alternatively, in order to reduce the possibility of poor display of the display panel, referring to fig. 2, the display panel at least includes a first polarizer 61; the dimming structure 5 and the first polarizer 61 are attached by the adhesive 7.

Here, the material, shape, type, and the like of the first polarizer are not particularly limited. For example, the first polarizer may include a planar film made of PVA (polyvinyl alcohol); alternatively, the first polarizer may include a planar film made of PVC (Polyvinyl Chloride). For example, the first polarizer may include a linear polarizer and a grating.

The display panel at least comprises a first polarizer, which means that: the display panel may include only the first polarizer; alternatively, the display panel may further include other polarizers, which are not specifically limited herein. FIG. 2 illustrates an example of a display panel 6 including a first polarizer 61 and a second polarizer 62.

Optionally, referring to fig. 2, the peep-proof display device further includes a backlight structure 8, where the backlight structure 8 includes an adhesive layer; the light modulation structure 5 is disposed between the first polarizer 61 and the backlight structure 8, and the light modulation structure 5 is fixed to the backlight structure 8 through an adhesive layer. Therefore, the dimming structure and the backlight structure can be well fixed, and the influence on a film layer in the backlight structure can be avoided.

The structure of the backlight structure is not particularly limited herein. By way of example, the backlight structures may include side-entry backlight structures; alternatively, the backlight structure may include a direct type backlight structure.

The backlight structure comprises an adhesive layer which is arranged on the outermost surface of the backlight structure, for example, the adhesive layer is distributed in a square shape, so that the backlight structure is attached to the dimming structure through the adhesive layer. The specific structure, material, and the like of the adhesive layer are not limited herein. Illustratively, the bonding layer may comprise a square bonding layer. Illustratively, the tie layer may comprise an adhesive.

Optionally, the adhesive comprises a pressure sensitive adhesive or a liquid optical adhesive.

The material of the liquid optical cement is not particularly limited. By way of example, the liquid optical cement may include liquid OCA (optical clear adhesive); alternatively, the liquid Optical cement may include liquid OCR (Optical Clear Resin), which has the characteristics of being colorless and transparent, having a light transmittance of 95% or more, and having good bonding strength.

The pressure-sensitive adhesive refers to an adhesive that can be applied with a pressure such that the adhesive immediately adheres to the smooth surface of an adherend, while at the same time, if the adhered surface of the adherend is destroyed, the adherend surface is not contaminated. The bonding process of pressure-sensitive adhesives is very sensitive to pressure, so the pressure-sensitive adhesives are called pressure-sensitive adhesives for short. The specific type of the pressure-sensitive adhesive is not limited herein, and the pressure-sensitive adhesive may include, for example, solvent-based pressure-sensitive adhesives, emulsion-based pressure-sensitive adhesives, hot-melt pressure-sensitive adhesives, and radiation-curable pressure-sensitive adhesives. For example, the pressure-sensitive adhesive may include emulsion type pressure-sensitive adhesives such as rubber-based pressure-sensitive adhesives, polyacrylate-based pressure-sensitive adhesives, polyvinyl ether resins, polyurethane resins, polyisobutylenes, and the like, according to the classification of the polymers in the pressure-sensitive adhesive.

The process of applying the pressure-sensitive adhesive is not particularly limited. For example, a liquid pressure-sensitive adhesive may be coated on one side of the light-adjusting structure matrix, and then the liquid pressure-sensitive adhesive is cured after the first protective layer is attached to one side of the liquid pressure-sensitive adhesive away from the light-adjusting structure matrix, and then the cured liquid pressure-sensitive adhesive is cut into a structure with a desired size and attached to the display panel.

In the related art, a transparent optical element is usually cemented by using a solid state OCA adhesive, the solid state OCA adhesive is colorless and transparent, has a light transmittance of more than 95%, has good cementing strength, can be cured at room temperature or at intermediate temperature, and has the advantages of small curing shrinkage, but the solid state OCA adhesive is thicker, and the thickness of the conventional OCA adhesive perpendicular to a liquid crystal box generally comprises 200 um. Because the current solid state OCA glue generally comprises the following structure: the heavy release film + OCA glue + light release film, so the manufacturing process for attaching the solid OCA glue and the PDLC usually includes the following steps: referring to fig. 11, the light release film of the solid OCA glue is firstly torn off and attached to the PDLC, and the heavy release film of the solid OCA glue is torn off and attached to the display panel.

The following problems exist in the related art of using solid OCA glue to attach a PLCD film to a liquid crystal cell: 1. solid-state OCA of once 200um thickness glues, will lead to the thickness increase of whole device more. 2. The PDLC and the solid OCA glue are firstly attached, so that the process flow is complex and the cost is high. 3. The PDLC is seriously warped after the film is peeled, and the PDLC having a serious warpage is difficult to attach to the display panel, and the warpage causes defects such as bubbles, as shown in fig. 10. Referring to fig. 10, the PDLC with severe warpage needs to be manually held down before subsequent attachment can be performed.

Therefore, the embodiment of the invention adopts the pressure-sensitive adhesive or the liquid optical adhesive, and the thickness of the pressure-sensitive adhesive or the liquid optical adhesive is far smaller than that of the solid OCA adhesive, so that the thickness of the peep-proof display device can be effectively reduced; meanwhile, the problem of difficult bonding caused by warping after the PDLC is torn off the protective film can be effectively solved by adopting the pressure-sensitive adhesive or the liquid optical adhesive, the production process is optimized, and the cost is reduced.

Optionally, in order to effectively reduce the thickness of the privacy display device, the thickness of the adhesive in the direction perpendicular to the dimming structure is 1-30 um.

The thickness of the adhesive in the direction perpendicular to the light modulating structure is not particularly limited. Illustratively, the thickness of the adhesive in a direction perpendicular to the light modulating structure includes 1um, 10um, 20um, or 30 um.

When the thickness of gluing along the perpendicular to structure direction of adjusting luminance is 30um, the solid-state OCA who replaces 200um with 30 um's gluing glues not only can effectively reduce peep-proof display device's thickness, and the preparation technology is comparatively simple, simple easy operation.

Optionally, in order to achieve the overall ultra-thin performance of the privacy display device, the thickness of the liquid crystal layer in a direction perpendicular to the dimming structure is in a range of 0.2 to 0.5 mm.

The thickness of the liquid crystal layer in the direction perpendicular to the light modulation structure is not particularly limited. Illustratively, the thickness of the liquid crystal layer in a direction perpendicular to the light modulating structure includes 0.2mm, 0.3mm, 0.4mm, or 0.5 mm.

When the thickness of the liquid crystal layer along the direction perpendicular to the dimming structure is 0.2mm, the thickness of the peep-proof display device can be effectively reduced, and the manufacturing process is simple and easy to operate.

Optionally, referring to fig. 3, the peep-proof display device further includes a first protection portion 30 and a second protection portion 31; the first protection part 30 is arranged on one side of the adhesive 7 away from the light modulation structure 5; the second protection part 31 is disposed on a side of the light modulating structure 5 away from the adhesive 7. Therefore, the adhesive glue and the dimming structure can be well protected, and the adhesive glue and the dimming structure are prevented from being damaged.

Here, the materials, structures, and the like of the first protective portion and the second protective portion are not particularly limited. For example, the material of the first protective portion and the second protective portion may each include a release film. For example, the first protection portion and the second protection portion may be both provided in a single layer.

Optionally, referring to fig. 3, the peep-proof display device further includes a control structure 10, where the control structure 10 is electrically connected to the first electrode 51 and the second electrode 52 respectively; the control structure 10 is configured to provide a control voltage to the first electrode 51 and the second electrode 52 such that the liquid crystal layer 53 of the dimming structure 5 has no diverging effect on the light.

The control structure is configured to provide a control voltage to the first electrode and the second electrode such that the liquid crystal layer of the dimming structure has no diverging effect on light. At this time, referring to fig. 4, the liquid crystal layer is transparent, and has no diffusion effect on light, that is, the liquid crystal layer becomes transparent when a voltage is applied, so that light is prevented from being diffused all around, and the display on the screen cannot be normally seen, and the display can be normally seen only at a viewing angle perpendicular to the screen, and the light vertically passes through the liquid crystal layer, so that the peeping-proof display device is in a peeping-proof state.

Optionally, the control structure is disposed on the display panel or the dimming structure.

The position of the control structure on the display panel or the dimming structure is not particularly limited herein. For example, the display panel may include an FPC (Flexible Printed Circuit), and the control structure may be integrated on the FPC. Alternatively, the control structure may be provided on the dimming structure, as shown in fig. 3.

The embodiment of the invention also provides a control method of the peep-proof display device, the peep-proof display device comprises a dimming structure, and the dimming structure comprises a first electrode, a second electrode and a liquid crystal layer; the peep-proof display device also comprises a control structure; the control structure is electrically connected to the first electrode and the second electrode, respectively.

The control method comprises the following steps:

and S11, opening the control structure, and providing control voltage for the first electrode and the second electrode to enable the liquid crystal layer to have no diffusion effect on light so as to enable the peep-proof display device to be in a peep-proof state.

The control structure provides a control voltage to the first electrode and the second electrode, and the type of the control voltage is not particularly limited. Illustratively, the control voltage may comprise a square wave voltage.

In this way, the control structure provides a control voltage to the first electrode and the second electrode, creating an electric field between the first electrode and the second electrode. At this moment, the liquid crystal layer is the transparence, does not have the effect of dispersing to the light, and the liquid crystal layer can become the transparence when also applying voltage to prevent the light to disperse all around, lead to unable normal seeing screen display all around, only can normally see the demonstration perpendicular to the visual angle of screen, the light passes the liquid crystal layer perpendicularly, so that peep-proof display device is in the peep-proof state.

And S12, closing the control structure to switch the peep-proof display device from the peep-proof state to the non-peep-proof state.

In this way, the control structure is closed, the control voltage is no longer supplied to the first and second electrodes, and no electric field is generated between the first and second electrodes. At this time, the liquid crystal layer is in an inoperative state, light is not stopped any more, and then the liquid crystal layer is in a semitransparent state, so that the light is strongly scattered, and the scattered light normally penetrates through the peep-proof display device, so that the peep-proof display device is in a peep-proof state.

It should be noted that the above steps S11 and S12 may be executed simultaneously; or executing the step S11 first and then executing the step S12; alternatively, step S12 is executed first, and then step S11 is executed.

By performing the above steps S11-S12, on one hand, the peep-proof display device can be made to have a peep-proof state and a non-peep-proof state by controlling the liquid crystal layer; on the other hand, the peep prevention of the upper and lower four directions of the horizontal direction and the vertical direction of the peep prevention display device can be simultaneously realized, so that the peep prevention effect is greatly improved.

For the structural description of the peep-proof display device in the embodiment of the present invention, reference may be made to the above-mentioned embodiments, which are not described herein again.

The embodiment of the invention also provides a preparation method of the peep-proof display device, which is shown in fig. 12.

The preparation method comprises the following steps:

and S21, providing the dimming structure matrix and the display panel.

Wherein, the structure parent of adjusting luminance includes a plurality of structures of adjusting luminance.

The order of providing the dimming structure precursor and providing the display panel is not particularly limited herein. Illustratively, a dimming structure precursor and a display panel may be provided simultaneously; alternatively, the light modulation structure precursor can be provided first, and then the display panel can be provided; alternatively, the display panel may be provided first, and then the light modulation structure precursor may be provided.

The specific structure of the dimming structure is not limited herein. For example, the dimming structure may include a first electrode, a liquid crystal layer, and a second electrode sequentially stacked; alternatively, the dimming structure may include a first protection part, a first electrode, a liquid crystal layer, a second electrode, and a second protection part, which are sequentially stacked; alternatively, the dimming structure may include a first electrode, a liquid crystal layer, a second electrode, and a first protection portion, which are sequentially stacked. Fig. 3 illustrates an example of the light modulation structure including a first protection portion 30, a first electrode 51, a liquid crystal layer 53, a second electrode 52, and a second protection portion 31, which are sequentially stacked, wherein the second protection portion 31 and the light modulation structure 5 are attached by an adhesive 7.

The Display panel may include an LCD (Liquid Crystal Display), or may include an OLED (Organic Light-Emitting Diode) Display panel, which is not limited in particular. Here, the specific structure of the display panel is not limited. Illustratively, referring to fig. 2, the display panel 6 includes a first polarizer 61, a display substrate 62, and a second polarizer 63, which are sequentially stacked.

And S22, coating an adhesive layer on one side of the light adjusting structure matrix.

Here, the material, thickness, and the like of the adhesive layer are not specifically shown. Illustratively, the material of the adhesive layer may include a pressure sensitive adhesive or a liquid optical adhesive. For example, the thickness of the adhesive layer in a direction perpendicular to the dimming structure may include 1-30 um.

The structure of the adhesive layer is not particularly limited. Illustratively, the adhesive layer may comprise a monolithic structure; alternatively, the adhesive layer may comprise a square structure, i.e. the adhesive layer may be arranged around the circumference of the matrix of the light modulating structure.

And S23, attaching a first protective layer on one side of the bonding layer away from the dimming structure matrix to form the dimming structure film.

Here, the material, structure, and the like of the first protective layer are not particularly limited. For example, the material of the first protective layer may include a release film. For example, the first protective layer may be provided as a whole layer.

And S24, cutting the dimming structure film along a preset cutting line to form a plurality of dimming structure sub-films.

Wherein, the structure sub-membrane of adjusting luminance includes structure, adhesive and the first protection portion of adjusting luminance.

The position, the shape and the like of the preset cutting line are not particularly limited, the preset cutting line is arranged before cutting, and the plurality of dimming structure sub-films can be obtained by cutting along the preset cutting line.

And S25, tearing off the first protection part.

The process of tearing off the first protective portion is not particularly limited herein. By way of example, the first protection part can be manually torn off; alternatively, the first protection portion may be machine-torn.

And S26, bonding the adhesive with the display panel.

The specific position where the adhesive is attached to the display panel is not limited herein. For example, the adhesive may be attached to the light-emitting side of the display panel; or, the adhesive may be attached to the light incident side of the display panel, specifically, the adhesive may be attached between the display panel and the backlight structure.

By executing the steps S21-S26, the light adjusting structure is cut into small pieces with required sizes after being coated with the adhesive layer before being cut, and then the small pieces are attached to the display panel, so that the process is optimized, the problem of difficulty in attaching due to warping after the protective film is torn off by the light adjusting structure can be effectively solved, the production process is shortened, the production process is optimized, the cost is reduced, namely, poor manufacturing process and processing time can be greatly reduced in the process of reducing the process, and the light adjusting structure has the cost advantage. The light adjusting structure is applied to the peep-proof display device, on one hand, the peep-proof display device can have a peep-proof state and a non-peep-proof state by controlling the liquid crystal layer; on the other hand, the peep prevention of the upper and lower four directions of the horizontal direction and the vertical direction of the peep prevention display device can be simultaneously realized, so that the peep prevention effect is greatly improved.

For the structural description of the peep-proof display device in the embodiment of the present invention, reference may be made to the above embodiments, which are not described herein again.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (11)

1. The peep-proof display device is characterized by comprising a dimming structure, a display panel and adhesive glue, wherein the dimming structure is attached to the display panel through the adhesive glue;

The dimming structure comprises a first electrode, a second electrode and a liquid crystal layer; the liquid crystal layer is disposed between the first electrode and the second electrode; the liquid crystal layer is configured to have no scattering effect on light when a voltage is applied and to have a scattering effect on light when a voltage is not applied.

2. The privacy display of claim 1, wherein the liquid crystal layer comprises polymer dispersed liquid crystal.

3. The privacy display device of claim 1, wherein the display panel comprises at least a first polarizer;

the light adjusting structure is attached to the first polarizer through the adhesive.

4. The privacy display device of claim 3, further comprising a backlight structure comprising an adhesive layer;

the light adjusting structure is arranged between the first polaroid and the backlight structure and is fixed with the backlight structure through the bonding layer.

5. The privacy display of claim 1, wherein the adhesive comprises a pressure sensitive adhesive or a liquid optical adhesive.

6. The privacy display device of claim 1, wherein the adhesive glue has a thickness in a direction perpendicular to the light modulating structure in a range comprising 1-30 um.

7. The privacy display of claim 1, wherein the liquid crystal layer has a thickness in the range of 0.2-0.5mm in a direction perpendicular to the light modulating structures.

8. The privacy display device of claim 1, further comprising a first protective portion and a second protective portion;

the first protection part is arranged on one side, away from the dimming structure, of the adhesive glue;

the second protection part is arranged on one side, far away from the adhesive glue, of the dimming structure.

9. The privacy display device of claim 1, further comprising control structures electrically connected to the first and second electrodes, respectively; the control structure is configured to provide a control voltage to the first and second electrodes such that the liquid crystal layer of the dimming structure has no diverging effect on light.

10. A method for controlling a privacy display as claimed in any one of claims 1 to 9 wherein the privacy display comprises a light modulating structure comprising a first electrode, a second electrode and a liquid crystal layer; the peep-proof display device also comprises a control structure; the control structure is electrically connected with the first electrode and the second electrode respectively;

The control method comprises the following steps:

opening the control structure, and providing control voltage to the first electrode and the second electrode to enable the liquid crystal layer to have no divergence effect on light rays, so that the peep-proof display device is in a peep-proof state;

and closing the control structure to enable the peep-proof display device to be switched from a peep-proof state to a non-peep-proof state.

11. A method of manufacturing the privacy display of any one of claims 1-9, comprising:

providing a light adjusting structure matrix and a display panel; wherein the dimming structure matrix comprises a plurality of dimming structures;

coating an adhesive layer on one side of the light adjusting structure matrix;

attaching a first protective layer to one side of the bonding layer, which is far away from the dimming structure matrix, so as to form a dimming structure film;

cutting the dimming structure film along a preset cutting line to form a plurality of dimming structure sub-films; wherein the dimming structure sub-film comprises a dimming structure, adhesive glue and a first protection part;

tearing off the first protection part;

and attaching the adhesive to the display panel.

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