CN211086856U - Electronically controlled privacy film, electronically controlled privacy LCD display and electronic equipment - Google Patents

Abstract

The present application discloses an electronically controlled privacy film comprising a PDLC electronically controlled film and a microgrid structure disposed on one surface of the PDLC electronically controlled film, the microgrid structure comprising a series of spaced opaque grids grid. The present application also discloses a liquid crystal display device including the electronically controlled privacy film and an electronic display device having the liquid crystal display device. According to the utility model, electronically controlled privacy protection is realized.

Description

Electronically controlled privacy film, electronically controlled privacy LCD display and electronic equipment

technical field

The utility model relates to the field of display technology, in particular to an electronically controlled anti-peeping film, a liquid crystal display device and an electronic device having the electronically controlled anti-peeping film.

Background technique

With the popularization of portable display equipment, the anti-peeping technology of the display has been paid more and more attention, and people hope to protect the privacy of individuals when using the electronic display equipment in public places. At present, a common privacy protection method is to add a privacy protection sheet to the outside of the display to shield light from a large angle, thereby achieving a privacy protection effect.

However, this solution requires an extra privacy sheet, which needs to be manually installed when the privacy protection function is used, and needs to be manually removed when the privacy protection function is not used, which brings inconvenience to the user.

There is a need for a new privacy device that is easy to use.

Utility model content

The purpose of the present invention is to provide an electronically controlled anti-peep film, which can realize the switching of the divergence angle of the transmitted light in an electronically controlled manner. Further, the purpose of the present invention also includes providing a liquid crystal display device and an electronic device with the electronically controlled privacy film.

According to one aspect of the present utility model, an electronically controlled privacy film is provided, which comprises a PDLC (Polymer Dispersed Liquid Crystal) electronically controlled film and a microgrid disposed on one surface of the PDLC electronically controlled film A grid structure comprising a series of spaced opaque grids.

The PDLC electric control film may include two substrate layers, two electrode layers sandwiched between the two substrate layers, and a PDLC layer sandwiched between the two electrode layers, and the micro-grid structure is connected to each other. on the outer surface of one of the two substrate layers.

In some embodiments, the microgrid structure is integrally formed on the outer surface of the one substrate layer.

In other embodiments, the microgrid structure is fabricated as a thin film attached to the outer surface of the one substrate layer.

In some embodiments, the opaque grids in the microgrid structure form an interdigitated grid.

Preferably, the height of the opaque grid is in the range of 10-1000 microns, and the pitch is in the range of 1-1000 microns.

Preferably, the width of the opaque grid is in the range of 0.1-100 microns.

According to another aspect of the present invention, an electronically controlled privacy-proof liquid crystal display device is provided. The electronically controlled anti-peeping liquid crystal display device includes a backlight light source module, a liquid crystal panel, and the above-mentioned electronically controlled anti-peeping film arranged between the backlight light source module and the liquid crystal panel. The grid structure is arranged on the surface of the PDLC electric control film facing the backlight light source module.

Preferably, the backlight light source module includes a light source, a light guide plate and at least one prism film disposed on the light exit side of the light guide plate.

According to yet another aspect of the present invention, there is provided an electronic device with a privacy protection function, which includes the above-mentioned electronically controlled privacy protection liquid crystal display device.

The electronically controlled anti-peeping film according to the utility model can realize the switching of the divergence angle of the transmitted light in an electronically controlled manner, which is very convenient to use. In addition, the electronically controlled privacy protection film can be easily combined with the existing display technology and display components, and has good technical adaptability, which helps to reduce the manufacturing cost of the display device using the privacy protection film.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments made with reference to the following drawings:

1 and 2 are schematic structural diagrams of an electronically controlled privacy protection film according to an embodiment of the present invention, wherein FIG. 1 shows the privacy protection state of the electronically controlled privacy protection film, and FIG. 2 shows the non- privacy protection state;

Figures 3 and 4 are enlarged schematic partial views of two different examples of opaque grids in a microgrid structure; and

5 and 6 are schematic structural diagrams of an electronically controlled privacy-proof liquid crystal display device according to an embodiment of the present invention, wherein FIG. 5 and FIG. 6 show a privacy-proof state and a non-privacy-proof state of the liquid crystal display device, respectively.

Detailed ways

The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for the convenience of description, only the parts related to the invention are shown in the drawings.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

First, the electronically controlled privacy protection film 10 according to the embodiment of the present invention will be introduced with reference to FIGS. 1 to 4 .

FIG. 1 and FIG. 2 are schematic structural diagrams of the electronically controlled privacy protection film 10 , respectively showing the privacy protection state and the non privacy protection state of the electronically controlled privacy protection film 10 . As shown in the figure, the electronically controlled privacy film 10 includes a PDLC electronically controlled film 11 and a micro-grid structure 12 disposed on one surface of the PDLC electronically controlled film 11 . The microgrid structure 12 includes a series of spaced opaque grids.

PDLC is a material formed by mixing low molecular liquid crystal and prepolymer under certain conditions to form micron-scale liquid crystal droplets uniformly dispersed in the polymer network. PDLC utilizes the dielectric anisotropy of liquid crystal molecules to have electro-optical response characteristics. Therefore, under the driving of an external electric field, PDLC has optical switching characteristics. Depending on the applied electric field, the PDLC can switch between a scattering state and a transparent state with a certain degree of haze.

1 and 2 illustrate an exemplary structure of the PDLC electrical control film 11 . As shown in the figure, the PDLC electric control film 11 may include two substrate layers 11a, two electrode layers 11b sandwiched between the two substrate layers 11a, and a PDLC layer 11c sandwiched between the two electrode layers 11b. The base material layer 11a may be made of, for example, a polymer material (eg, PET), glass, or the like. The electrode layer 11b may be a conductive medium layer, such as an indium tin oxide (ITO) layer, plated on the surface of the base material layer 11a. By applying or not applying an electric field to the PDLC layer 11c via the two electrode layers 11b, the PDLC layer 11c can be controlled to switch between the transparent state and the scattering state. It should be understood that the present invention is not limited to the above structure of the PDLC electronic control film 11 .

According to the embodiment of the present invention, the micro-grid structure 12 is connected to the outer surface of one of the base material layers 11 a of the PDLC electric control film 11 . In some embodiments, the micro-grid structure 12 may be integrally formed on the outer surface of the substrate layer 11a. A series of spaced-apart opaque grids are directly fabricated on the outer surface of the substrate layer 11a by semiconductor processes such as etching or sputtering. In other embodiments, the micro-grid structure 12 may be formed discretely (eg, as a thin film), and then attached to the outer surface of the substrate layer 11a. For example, the microgrid structure 12 may be fabricated as a film comprising a series of spaced-apart opaque portions and transparent portions filled between the opaque portions, and then applied to the substrate layer 11a by methods such as gluing, heat fusion, or the like superior.

According to the embodiment of the present invention, the height of the opaque grids of the micro grid structure 12 may be in the range of 10-1000 microns, and the spacing may be in the range of 1-1000 microns. The width of the opaque grid may be in the range of 0.1 to 100 microns. It should be understood that the present invention is not limited to the above-mentioned specific dimensions of the opaque grids of the micro-grid structure 12 , as long as the micro-grid structure 12 can shield the large-angle light entering the micro-grid structure 12 .

When the electronically controlled anti-peeping film 10 according to the embodiment of the present invention is in use, after the divergent light enters the micro-grid structure 12 , light with a large angle is absorbed, and only light with a smaller angle can enter the PDLC electronically controlled film 11 . That is, the outgoing beam divergence angle β of the micro-grid structure 12 is smaller than the incident beam divergence angle α, as shown in FIG. 1 and FIG. 2 .

A voltage is applied to the PDLC electric control film 11 shown in FIG. 1 , that is, it is in an on-state, and the PDLC layer 11c is in a transparent state at this time, and the light exit angle is not changed. Therefore, the beam divergence angle at the exit side of the PDLC electronic control film 11 (ie, the display angle in the privacy-proof state) γ is equal to the exit beam divergence angle β of the micro-grid structure 12 , that is, γ=β. The specific value of the beam divergence angle β of the micro-grid structure 12 depends on the specific size of the micro-grid structure 12; according to the embodiment of the present invention, the angle β is a relatively small angle. Therefore, at this time, the electronically controlled anti-peeping film 10 is in the anti-peeping state, that is, the light passing through the electronically controlled anti-peeping film 10 can be observed only in a range with a small angle to the normal direction of the electronically controlled anti-peeping film 10 .

No voltage is applied to the PDLC electronic control film 11 shown in FIG. 2 , that is, it is in an off-state. At this time, the PDLC layer 11c is in a scattering state and has a certain haze. The light passing through the PDLC layer will be scattered, so that the beam divergence angle (ie, the display angle of the non-peep proof state) γ' on the exit side of the PDLC electronically controlled film 11 is greater than the exit beam divergence angle β of the micro-grid structure 12, that is, γ'>β. The specific value of the display angle γ' in the non-privacy state depends on the parameters of the PDLC electronically controlled film 11, such as the film thickness, the mixing ratio of liquid crystal and polymer, the frequency of the driving voltage, etc. The display angle γ' of the state is a relatively large angle, for example, greater than 120 degrees. Therefore, the electronically controlled privacy protection film 10 at this time is in a non-privacy protection state, that is, light passing through the electronically controlled privacy protection film 10 can be observed in a range with a large angle to the normal direction of the privacy protection film.

The electronically controlled privacy protection film 10 according to the embodiment of the present invention can realize the switching of the divergence angle of the transmitted light in an electronically controlled manner, which is very convenient to use.

Figures 3 and 4 are partially enlarged schematic views of two different examples of opaque grids in a microgrid structure. As shown in FIG. 3 and FIG. 4 , the opaque grids in the micro grid structure 12 may be strip grids arranged in a single direction (see grid 12a shown in FIG. 3 ), or may be formed as grids crossing each other grid (see grid 12b shown in FIG. 4). It should be understood that what is shown in FIGS. 3 and 4 is only exemplary and not limiting, and the micro-grid structure 12 is not limited to the specific structure shown in FIGS. 3 and 4, nor is it limited to the period or period of the grid. Aperiodic arrangement.

In some embodiments, the microgrid structure 12 may comprise multiple layers of opaque grids stacked together.

Next, an electronically controlled privacy-proof liquid crystal display device 100 according to an embodiment of the present invention will be described with reference to FIG. 5 and FIG. 6 .

FIG. 5 and FIG. 6 are schematic structural diagrams of the electronically controlled anti-privacy liquid crystal display device 100. As shown in FIG. 5 and FIG. The peeping film 10 , the backlight light source module 20 and the liquid crystal panel 30 . The electronically controlled privacy film 10 is disposed between the backlight light source module 20 and the liquid crystal panel 30 , and the micro-grid structure 12 of the electronically controlled privacy film 10 is disposed on the PDLC electronically controlled film 11 of the electronically controlled privacy film 10 facing the backlight. on the surface of the light source module 20 .

The backlight light source module 20 can be any suitable backlight light source module that provides divergent illumination light. For the purpose of example only, a structure of the backlight light source module 20 is shown in FIGS. 5 and 6 , wherein the backlight light source module 20 includes a light source 21 (such as a light emitting diode), a light guide plate 22 and a light source disposed on the light guide plate 22 At least one prism film 23 on the light exit side. A reflection film 22a may be further provided on the bottom surface of the light guide plate 22 . Other types of film layers may also be added to the backlight light source module 20 as required, for example, a diffusion film 24 may be added between the light guide plate 22 and the prism film 23 . The light emitted by the light source 21 of the backlight light source module 20 enters the light guide plate 22, and the upper surface of the light guide plate 22 guides part of the light out. The prism film 23 above the light guide plate 22 changes the direction of the light so that it has a larger divergence angle.

It should be understood that the electronically controlled privacy-proof liquid crystal display device 100 according to the embodiment of the present invention is not limited to the specific structure of the backlight light source module 20 .

FIG. 5 and FIG. 6 respectively show the privacy-proof state and the non-privacy-proof state of the electronically controlled privacy-proof liquid crystal display device 100 . In the state shown in FIG. 5 , a voltage is applied to the PDLC electric control film 11 of the electronically controlled privacy film 10 , and the electronically controlled privacy film 10 is in the privacy protection state. The light passes through the electronically controlled anti-peep film 10 , and only light within a small angle range is irradiated onto the liquid crystal panel 30 . At this time, the user can only observe the information on the liquid crystal panel 30 within a small angle range, so the liquid crystal display device 100 is in a privacy-proof state at this time. In the state shown in FIG. 6 , no voltage is applied to the PDLC electronically controlled film 11 of the electronically controlled privacy film 10 , and the electronically controlled privacy protection film 10 is in a non-privacy-proof state. Therefore, the output from the backlight light source module 20 has a large divergence. The angular light passes through the electronically controlled privacy film 10 and irradiates the liquid crystal panel 30 with a larger beam divergence angle. At this time, the user can observe the information on the liquid crystal panel 30 in a wide angle range, so the liquid crystal display device 100 is in a privacy-proof state at this time.

Although not shown in the figures, the present invention also relates to an electronic display device including the above-mentioned electronically controlled privacy-proof liquid crystal display device.

It can be seen that, by using the electronically controlled anti-peep liquid crystal display device and electronic display device according to the present invention, the user can realize between the anti-peep mode and the shared display (not anti-peep) mode through buttons or software control in a more convenient way. Toggle between display states.

Further, it can be seen that the electronically controlled privacy film according to the embodiment of the present invention can be easily combined with the existing display technology and display components, and the technical adaptability is good, which helps to reduce the cost of the display device using this privacy film. manufacturing cost.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, and should also cover the above-mentioned technical features without departing from the inventive concept. Other technical solutions formed by any combination of its equivalent features. For example, a technical solution is formed by replacing the above-mentioned features with the technical features disclosed in this application (but not limited to) with similar functions.

Claims (10)

1. an electronically controlled anti-peep film, is characterized in that, comprises PDLC electric control film and the micro-grid structure that is arranged on a surface of this PDLC electric-control film, and described micro-grid structure comprises a series of spaced opaque grille. 2. The electronically controlled privacy film according to claim 1, wherein the PDLC electronically controlled film comprises two substrate layers, two electrode layers sandwiched between the two substrate layers, and two electrode layers sandwiched between the two substrate layers. A PDLC layer between the two electrode layers, the microgrid structure is attached to the outer surface of one of the two substrate layers. 3 . The electronically controlled privacy protection film of claim 2 , wherein the micro-grid structure is integrally formed on the outer surface of the one substrate layer. 4 . 4 . The electronically controlled privacy protection film according to claim 2 , wherein the micro-grid structure is made into a thin film and adhered to the outer surface of the one substrate layer. 5 . 5 . The electronically controlled privacy protection film according to claim 1 , wherein the opaque grids in the micro-grid structure are formed in a grid shape that intersects with each other. 6 . 6 . The electronically controlled privacy film according to claim 1 , wherein the height of the opaque grid is in the range of 10-1000 microns, and the spacing is in the range of 1-1000 microns. 7 . 7 . The electronically controlled privacy protection film according to claim 6 , wherein the opaque grid has a width in the range of 0.1-100 μm. 8 . 8. An electronically controlled anti-peeping liquid crystal display device, comprising a backlight light source module and a liquid crystal panel, wherein the electronically controlled anti-peeping liquid crystal display device further comprises a The electronically controlled anti-peep film according to any one of claims 1 to 7, wherein the micro-grid structure of the electronically controlled anti-peep film is disposed on the surface of the PDLC electronically controlled film facing the backlight light source module. 9 . The electronically controlled anti-privacy liquid crystal display device according to claim 8 , wherein the backlight light source module comprises a light source, a light guide plate and at least one prism film disposed on the light exit side of the light guide plate. 10 . 10 . An electronic device with anti-peep function, characterized in that it comprises the electronically controlled anti-peep liquid crystal display device according to claim 8 or 9 .

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