CN207965427U - Anti-peeping control device and backlight module and display using same - Google Patents

Abstract

A peep-proof control device comprises two polaroids and a liquid crystal box which are arranged between the two polaroids, wherein an included angle between 5 degrees and 15 degrees is formed between the axial directions of the penetrating shafts of the two polaroids, or the axial directions of the two penetrating shafts of the two polaroids are parallel, are not parallel or perpendicular to any side edge of the polaroids, and the axial directions of the penetrating shafts of the two polaroids are perpendicular or parallel to the alignment direction of an alignment layer of the liquid crystal box. The peep-proof control device can switch the peep-proof effect by using an electric control mode. A backlight module and a display using the anti-peeping control device are also provided.

Description

Anti-peeping control device and backlight module and display using same

technical field

The utility model relates to a light control device and its application, in particular to an anti-peep control device with switchable anti-peep effect and adjustable anti-peep azimuth direction, as well as a display and a backlight module used therein.

Background technique

When users use a display device, especially a portable display device, they often do not want others to watch the displayed content. Therefore, a display device with an anti-peeping function is what consumers strive for in order to obtain safe privacy. pursued.

At present, when a general display device has switching requirements for privacy protection, a common method is to place a privacy protection sheet and an electronically controlled diffusion sheet above the display device or the backlight module, but this method consumes a lot of power; another method uses a narrow viewing angle The backlight module combined with the wide viewing angle function utilizes the control of different light sources to achieve anti-peeping or sharing effects, but the anti-peeping effect of this design is not good.

This "Background Technology" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "Background Technology" may contain some known technologies that do not constitute the knowledge of those skilled in the art. In addition, the content disclosed in the "Background Technology" does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it represent that those skilled in the art have known or cognition.

Utility model content

The utility model provides an anti-peeping control device, which uses an electric control method to switch the anti-peeping effect.

The utility model provides a backlight module, which uses an anti-peeping control device to change the light emitting angle of a provided surface light source.

The utility model provides a display to achieve the anti-peeping control effect.

Other purposes and advantages of the utility model can be further understood from the technical characteristics disclosed in the utility model.

In order to achieve one or part or all of the above purposes or other purposes, the anti-peeping control device provided by an embodiment of the present invention includes a first polarizer, a second polarizer and a liquid crystal cell, and the liquid crystal cell is arranged on the first polarizer and between the second polarizer. The first polarizer includes a first transmission axis with a first axis, the second polarizer is opposite to the first polarizer, and the second polarizer includes a second transmission axis with a second axis. The relationship between the first penetration axis and the second penetration axis meets at least one of the following conditions: (1) There is an angle between the first axis and the second axis and the angle is between 5 degrees and 15 degrees and (2) the first axis is parallel to the second axis, and the first axis is neither parallel nor perpendicular to any side of the first polarizer, and the second axis is neither parallel nor perpendicular to the second Either side of the polarizer. The liquid crystal cell includes a first alignment layer, a second alignment layer and a liquid crystal material. The liquid crystal material is disposed between the first alignment layer and the second alignment layer. The first alignment direction and the first axis of the first alignment layer are sandwiched between The angle is selected from one of 0±5 degrees and 90±5 degrees, and the included angle between the second alignment direction and the second axis of the second alignment layer is selected from one of 0±5 degrees and 90±5 degrees.

To achieve one or part or all of the above objectives or other objectives, a backlight module provided by an embodiment of the present invention includes an optical plate, a light source, and the above-mentioned anti-peeping control device. The optical plate has a light incident surface and a light emitting surface, the light source is arranged beside the light incident surface, and the anti-peeping control device is arranged opposite to the light emitting surface of the optical plate, and the first polarizer faces the optical plate.

In order to achieve one or part or all of the above objectives or other objectives, the display provided by an embodiment of the present invention includes a display panel and the aforementioned backlight module with an anti-peeping control device, wherein the display panel includes a panel module, and wherein the display panel It is arranged on the side away from the optical plate of the anti-peeping control device, or is arranged between the optical plate and the anti-peeping control device.

The anti-peeping control device according to the embodiment of the utility model adopts the angle between the two penetrating axes of the two polarizers to be arranged at an angle of 5 degrees to 15 degrees, or the axial directions of the two penetrating axes of the two polarizing films are arranged in parallel but not Parallel and not perpendicular to either side of the polarizer, the alignment direction of the two alignment layers of the liquid crystal cell is parallel or perpendicular to the two transmission axes to perform anti-peeping control, so it can be controlled by applying voltage to the liquid crystal cell Achieve anti-peep control. In the backlight module of the embodiment of the present invention, the light emission angle of the provided surface light source can be changed by the anti-peep control device, and the display using the backlight module can achieve an asymmetric anti-peep effect.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of an anti-peeping control device according to an embodiment of the present invention.

2a and 2b are schematic views of the axial direction of the penetrating axis of the polarizer and the alignment direction of the alignment layer in the anti-peeping control device of the first embodiment of the present invention, respectively.

3a and 3b are schematic views of the axial direction of the penetrating axis of the polarizer and the alignment direction of the alignment layer in the anti-peeping control device of the second embodiment of the present invention, respectively.

Fig. 4 is a schematic cross-sectional structure diagram of an anti-peeping control device according to another embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a backlight module with an anti-peeping control device according to an embodiment of the present invention.

FIG. 6 is a schematic perspective view of the backlight module.

FIG. 7 is a schematic cross-sectional structure diagram of a display according to a first embodiment of the present invention.

8a and 8b are schematic diagrams of angle distribution of the display in the anti-peeping mode and the normal mode, respectively, according to a first embodiment of the present invention.

FIG. 9 is a schematic cross-sectional structure diagram of a display according to a second embodiment of the present invention.

FIG. 10 a and FIG. 10 b are schematic diagrams of the angle distribution of the display in the anti-peeping mode and the normal mode, respectively, according to a second embodiment of the present invention.

FIG. 11 is a schematic cross-sectional structure diagram of a display according to a third embodiment of the present invention.

FIG. 12 is a schematic cross-sectional structure diagram of a display according to a fourth embodiment of the present invention.

FIG. 13 is a schematic cross-sectional structure diagram of a display according to a fifth embodiment of the present invention.

Detailed ways

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.

Figure 1 is a schematic cross-sectional structure diagram of an anti-peep control device according to an embodiment of the present invention. As shown in the figure, the anti-peep control device 10 includes two polarizers and a liquid crystal cell 12, and the two polarizers are respectively a first polarizer 14 and a liquid crystal cell 12. The second polarizer 16 is disposed opposite to the first polarizer 14 , and the liquid crystal cell 12 is disposed between the first polarizer 14 and the second polarizer 16 . The liquid crystal cell 12 includes a first alignment layer 123 , a second alignment layer 124 and a liquid crystal material 125 . The liquid crystal material 125 is disposed between the first alignment layer 123 and the second alignment layer 124 , wherein the first alignment layer 123 is adjacent to the first polarizer 14 , and the second alignment layer 124 is adjacent to the second polarizer 16 . In addition, the liquid crystal material 125 can be selected from one of positive liquid crystals and negative liquid crystals, wherein negative liquid crystals are often used in vertical alignment (VA, Vertical Alignment) liquid crystal displays, and positive liquid crystals are often used in twisted nematic (TN, Twisted) liquid crystal displays. Nematic) liquid crystal display. The liquid crystal cell 12 of the anti-peeping control device 10 of this embodiment further includes two substrates 121 and two electrode layers 122 , for example. The two substrates 121 are arranged between the first polarizer 14 and the second polarizer 16, and the first alignment layer 123, the second alignment layer 124 and the liquid crystal material 125 are arranged between the two substrates 121. In one embodiment, the substrate 121 is a glass substrate. The two electrode layers 122 are disposed between the two substrates 121 , and the first alignment layer 123 , the second alignment layer 124 and the liquid crystal material 125 are disposed between the two electrode layers 122 .

Please refer to FIG. 2 a and FIG. 2 b , which are schematic views of the axial direction of the penetrating axis of the polarizer and the alignment direction of the alignment layer in the anti-peeping control device according to a first embodiment of the present invention. For ease of understanding, in FIG. 2a, only the first polarizer 14 and the second polarizer 16 are stacked separately for illustration, and in FIG. 2b, only the first alignment layer 123 and the second alignment layer 124 are stacked separately. illustrate. The first polarizer 14 includes a first transmission axis with a first axis 141r, the second polarizer 16 includes a second transmission axis with a second axis 161r, the first axis 141r and the second axis 161r There is an included angle θ between them, and the included angle θ is between 5 degrees and 15 degrees. In addition, the included angle between the first alignment direction 123r of the first alignment layer 123 and the first axis 141r is selected from one of 0±5 degrees and 90±5 degrees, that is, the first alignment direction 123r and the first axis 141r are substantially parallel or perpendicular; the angle between the second alignment direction 124r of the second alignment layer 124 and the second axis 161r is selected from one of 0±5 degrees and 90±5 degrees, that is, the second The alignment direction 124r is substantially parallel or perpendicular to the second axis 161r.

In one embodiment, as shown in FIG. 2a, the second axis 161r is vertical, for example, the second penetration axis is 90 degrees, and the first axis 141r is slightly inclined, for example, the penetration axis is 90±(5-15 ) degrees; correspondingly, as shown in Figure 2b, the second alignment direction 124r is parallel to the second axial direction 161r, for example, a 90-degree alignment direction, and the first alignment direction 123r is also parallel to the first axial direction 141r. This is the limit.

In the above-mentioned embodiment, the difference between the first axis 141r of the first transmission axis of the first polarizer 14 and the second axis 161r of the second transmission axis of the second polarizer 16 is 5 degrees to 15 degrees. Anti-peeping control is achieved in combination with the voltage applied to the liquid crystal cell 12 or not. In addition to the anti-peeping control through the arrangement of the included angle of 5 degrees to 15 degrees between the first axis 141r and the second axis 161r combined with the adjustment of the first alignment direction 123r and the second alignment direction 124r, in In the following second embodiment, it is also explained that the utility model can also use the axial direction of the penetration axes of the two polarizers to be parallel to each other, but neither parallel nor perpendicular to any side of the polarizer in combination with the alignment direction of the alignment layer. Anti-peeping control is performed, wherein the included angle between the alignment direction and the axial direction of the penetration axis is 0±5 degrees or 90±5 degrees.

Please refer to Fig. 3a and Fig. 3b, which are respectively schematic diagrams of the axial direction of the penetrating shaft of the polarizer and the alignment direction of the alignment layer in the anti-peeping control device of the second embodiment of the present invention. As shown in Fig. 3a, the first The axis 141r and the second axis 161r are parallel to each other. However, the first axis 141r is not parallel to the second axis 161r and is not perpendicular to any side of the first polarizer 14 or the second polarizer 16, such as the bottom edge 142 (162); correspondingly, as shown in FIG. 3b , the first alignment direction 123r is parallel to the first axis 141r, and the second alignment direction 124r is parallel to the second axis 161r, the present invention is not limited thereto.

4 is a schematic cross-sectional structure diagram of an anti-peeping control device according to another embodiment of the present invention. As shown in the figure, compared with the above-mentioned anti-peeping control device 10, the anti-peeping control device 10a of this embodiment also includes at least one compensation The film 18 is disposed between the liquid crystal cell 12 and the first polarizer 14 , and/or between the liquid crystal cell 12 and the second polarizer 16 . In this embodiment, two compensation films 18 are taken as an example, which are respectively disposed between the liquid crystal cell 12 and the first polarizer 14 , and between the liquid crystal cell 12 and the second polarizer 16 , but not limited thereto. In addition, the type of compensation film 18 can be a uniaxial structure compensation film whose optical axis is parallel to the surface (A-plate) of the film, a uniaxial structure compensation film whose optical axis is perpendicular to the surface (C-plate) of the film, or a film The optical axis of the film and the surface of the film have an inclination (O-plate) uniaxial structure compensation film, biaxial compensation film or any combination of two or more. The selection of a single type of compensation film or the mix and match of any two or more types of compensation films is mainly to adjust the compensation value of the in-plane optical path difference (Ro) and the compensation value of the out-of-plane optical path difference (Rth), Ro and Rth The range of values is as follows: Rth is between 100 nm and 800 nm, preferably 400±200 nm, more preferably 400±100 nm; Ro is less than 200 nm, preferably less than 50 nm. When the anti-peeping control device is applied to the display or backlight module, if you choose to use A-plate uniaxial structure compensation film, C-plate uniaxial structure compensation film or biaxial compensation film, the display or backlight module can increase the The shading angle range in the azimuth angle; when the anti-peeping control device 10a chooses to use the O-plate uniaxial structure compensation film, the shading angle range of the display or the backlight module in the elevation angle can be increased.

5 is a schematic structural diagram of a backlight module with an anti-peeping control device according to an embodiment of the present invention. As shown in FIG. 5 , the backlight module 20 includes an optical board 22 , a light source 24 and an anti-peeping control device 10 . The optical plate 22 of this embodiment is, for example, a light guide plate, having a light incident surface 221 and a light exit surface 222 . The light source 24 is disposed beside the light incident surface 221 ; the anti-peep control device 10 is disposed opposite to the light exit surface 222 of the optical plate 22 . In addition, the backlight module 20 may further include a reverse prism sheet 26 . For the convenience of the following description, the first polarizer 14 (shown in FIG. 1 ) that defines the anti-peep control device 10 faces the optical plate 22; Between the light-emitting surfaces 222 , the inverse prism sheet 26 has a plurality of parallel-arranged prism columns (not shown) facing the light-emitting surface 222 of the optical plate 22 .

In one embodiment, when the backlight module 20 is combined with the display panel (not shown in the figure), in order to avoid moiré pattern (Moiré pattern) generated by the reverse prism sheet 26 with the display panel, the extending direction 261r of the prism column is not a horizontal line direction, and the prism The extension direction 261r of the column deflects in a first direction with respect to a reference line 262 and has a deflection angle w between the reference line 262, wherein the reference line 262 is perpendicular to any opposite side of the reverse prism sheet 26, in an embodiment In example, as shown in the inverse prism sheet 26 of Fig. 5, with the bottom edge 263 of the inverse prism sheet 26 or any line parallel to the bottom edge 263 as the reference line 262, the extending direction 261r of the prism column goes clockwise with respect to the reference line 262 direction (first direction) with a deflection angle w. The configuration of the anti-peep control device 10 in the backlight module 20 of this embodiment can be used to adjust the viewing angle deviation caused by the deflection angle w. The adjustment of the first axis 141r, the second axis 161r of the second transmission axis of the second polarizer 16, the first alignment direction 123r, and the second alignment direction 124r can compensate the shifted viewing angle and make the viewing angle symmetrical . 6 is a schematic diagram of the angle of view of the backlight module. As shown in the figure, when the deflection angle of the extending direction 261r of the prism column of the reverse prism sheet 26 is clockwise deflection, for example, when the deflection is 4 degrees, if the backlight module does not have an anti-peeping control device configuration, as shown by the solid line, the peak value of the brightness percentage will move to the right relative to the 0-degree axis of the viewing angle, resulting in an overall deviation of the viewing angle; and the dotted line is the viewing angle of the backlight module with the anti-peeping control device in this embodiment Schematic diagram, as shown in the figure, the offset viewing angle will be corrected to the left, and then the offset viewing angle will be moved back to make the viewing angle symmetrical.

Continuing the above description, in one embodiment, when the extending direction 261r of the prism column is deflected clockwise (first direction) relative to the reference line 262, the first transmission axis of the first polarizer 14 can be set to The axis 141r is deflected in the counterclockwise direction (the second direction), and the first alignment direction 123r is also deflected correspondingly. In the above-mentioned embodiment, the first direction is opposite to the second direction, but the present invention is not limited thereto. Not all the extension directions 261r of the prism columns of the reverse prism sheet 26 will rotate clockwise when matched with the backlight, nor is it anti-peeping The first polarizer 14 or the second polarizer 16 of the control device 10 must deflect in a direction opposite to the first direction. Due to the influence of the design of the components of the backlight module, such as the direction and shape of the dots, or the angle of the prism, it is also possible that the extension direction 261r of the prism column of the reverse prism sheet 26 rotates clockwise, but the first polarized light of the anti-peeping control device 10 Only when the polarizer 14 or the second polarizer 16 is rotated clockwise can the angle of view shift be offset, or, in a specific use situation, it is necessary to rotate the anti-peep control box clockwise to make the angle of view shift larger .

The embodiment shown in FIG. 5 is the case where the backlight module is selectively configured with a reverse prism sheet. When the backlight module does not use the reverse prism sheet, the use of the anti-peep control device can achieve an asymmetric anti-peep effect by adjusting the alignment direction of the alignment layer, that is, the brightness of the display seen in two symmetrical viewing directions different.

7 is a schematic cross-sectional structure diagram of a display according to a first embodiment of the present invention. As shown in the figure, a display 30 a includes a display panel 32 and an anti-peeping control device 10 stacked up and down. The display panel 32 includes, for example, a panel module 34 and a third polarizer 36 , and the third polarizer 36 includes a third transmission axis with a third axis. The panel module 34 can be a self-luminous panel module (such as an organic light-emitting diode display panel module), or a non-self-luminous panel module (such as a liquid crystal panel module), wherein the liquid crystal panel module can be an in-plane switching (IPS) panel module, but This is not the limit. When the panel module 34 is a non-self-illuminating panel module, the display 30 a may include the light source 24 and the optical plate 22 of the above-mentioned backlight module 20 in addition to the anti-peeping control device 10 . For the convenience of the following description, the configuration of the anti-peeping control device 10 is defined as that the first polarizer 14 is disposed below the liquid crystal cell 12 , and the second polarizer 16 is disposed above the liquid crystal cell 12 . In the display 30a of the first embodiment, the panel module 34 is arranged on the second polarizer 16, and the third polarizer 36 is arranged on the side of the panel module 34 away from the anti-peeping control device 10, that is, arranged above the panel module 34 . In addition, if the panel module 34 is an organic light emitting diode display panel module, the anti-peeping control device is arranged above the light emitting direction side of the organic light emitting diode display panel module, and there is no need to install a polarizer under the organic light emitting diode display panel module. piece.

Continuing from the above description of the case where the panel module 34 is a non-self-illuminating panel module, in one embodiment, the anti-peeping control device 10 adopts a configuration with an included angle of 5 degrees to 15 degrees between the first axis 141r and the second axis 161r, For example, the first axis 141r is 10 degrees, the second axis 161r is 0 degrees, and the first alignment direction 123r is adjusted vertically or parallel to the first axis 141r (for example, the first alignment direction 123r is 100 degrees), and the second alignment The direction 124r is perpendicular to or parallel to the second axis 161r (for example, the second alignment direction 124r is 270 degrees).

When the display has special requirements to achieve a left-right asymmetric anti-peep effect, take the first axis 141r of the first polarizer 14 as an example with a deflection of 10 degrees, through the second polarizer of the anti-peep control device 10 of the above embodiment The adjustment of the second axis 161r of 16, the first alignment direction 123r and the second alignment direction 124r can make the display 30a achieve an asymmetric anti-peeping effect or offset the viewing angle deviation caused by the deflection of the reverse prism sheet, and avoid Vertical luminance drops. Fig. 8a and Fig. 8b are respectively the angle distribution schematic diagrams of the display of the first embodiment of the present invention in anti-peeping mode and normal mode, as shown in Fig. 8a, when applying voltage to liquid crystal cell 12 (peeping-proof mode), can To achieve an asymmetric anti-peep effect.

According to the above, in the display 30a of this embodiment, only the third polarizer 36 needs to be arranged above the panel module 34, and no other polarizer needs to be arranged below the panel module 34, and the second polarizer 16 of the anti-peeping control device 10 is shared. That is, but this embodiment is not limited thereto, for example, other polarizers may also be disposed under the panel module 34 . Compared with the general liquid crystal display panel, which requires polarizers to be arranged above and below the panel module, the display 30a of this embodiment not only achieves the anti-peeping control effect, but also satisfies the cost and The need for reduced thickness and maintained brightness.

FIG. 9 is a schematic cross-sectional structure diagram of a display according to a second embodiment of the present invention. As shown in FIG. 9 , a display 30 b includes a display panel 32 and an anti-peeping control device 10 stacked up and down. The display panel 32 includes a panel module 34, a third polarizer 36, and a fourth polarizer 38. The third polarizer 36 includes a third transmission axis with a third axis, and the fourth polarizer 38 includes a third transmission axis with a fourth axis. Fourth penetrating axis. In the display 30b of the second embodiment, the display panel 32 is arranged above the anti-peep control device 10, and the fourth polarizer 38 is arranged on the side of the panel module 34 facing the anti-peep control device 10 (that is, the fourth polarizer 38 is arranged on the The bottom of the panel module 34), and adjacent to the second polarizer 16, the third polarizer 36 is arranged on the side of the panel module 34 away from the anti-peeping control device 10 (that is, the third polarizer 36 is arranged on the side of the panel module 34 above). In this embodiment, the anti-peeping control device 10 adopts a configuration in which the first axis 141r and the second axis 161r are parallel to each other, but not parallel to and not perpendicular to any side of the first polarizer 14 or the second polarizer 16, The fourth axis (not shown) of the fourth polarizer 38 and the second axis 161r of the second polarizer 16 are neither parallel nor perpendicular to each other.

In the display 30b of the second embodiment, taking the first axis 141r of the first polarizer 14 as an example, the second axis 161r of the second polarizer 16 is also deflected by 10 degrees. The fourth polarizer 38 When the fourth penetration axis is 0 degrees, the first alignment direction 123r is adjusted vertically or parallel to the first axis 141r (for example, the first alignment direction is 100 degrees), and the second alignment direction 124r is perpendicular to or parallel to the second axis 161r (For example, the second alignment direction is 280 degrees), so that the display 30b can achieve an asymmetric anti-peeping effect or counteract the deviation of the viewing angle caused by the deflection of the reverse prism sheet. Fig. 10a and Fig. 10b are respectively the angle distribution schematic diagrams of the display 30b of the second embodiment of the present invention in the peep-proof mode and the normal mode. As shown in Fig. 10a, when voltage is applied to the liquid crystal cell 12 (peep-proof mode), Asymmetric anti-peep effect can be achieved.

11 is a schematic cross-sectional structure diagram of a display according to a third embodiment of the present invention. As shown in FIG. 11 , the anti-peep control device 10 of the display 30c is arranged above the display panel 32 , and the first polarizer 14 of the anti-peep control device 10 It is a reflective polarizer, the second polarizer 16 is an absorption polarizer, and the first polarizer surface 14 faces the display panel 32; in addition, the display panel 32 includes a panel module 34, a third polarizer 36 and a fourth polarizer 38, the third polarizer The polarizer 36 is disposed below the panel module 34 , and the fourth polarizer 38 is disposed above the panel module 34 and adjacent to the first polarizer 14 (reflective polarizer). The configuration of the first polarizer 14 (reflective polarizer) not only has the effect of the polarizer, but also can reflect ambient light to enhance the anti-peeping effect. In addition, similar to the embodiment of FIG. 7 , the fourth polarizer 38 of this embodiment can also be omitted, that is, the panel module 34 can share the first polarizer 14 of the anti-peeping control device 10 .

Fig. 12 is a schematic cross-sectional structure diagram of a display according to a fourth embodiment of the present invention. As shown in Fig. 12, a display 30d includes a display panel 32 and a backlight module 20, wherein the backlight module 20 includes a light source (not shown), an optical plate 22. Anti-peeping control device 10. In the fourth embodiment, the anti-peeping control device 10 is arranged above the optical plate 22, and the display panel 32 is arranged above the anti-peeping control device 10, wherein the first polarizing plate of the anti-peeping control device 10 14 faces the optical plate 22, and an inverse prism sheet can be optionally arranged between the first polarizer 14 and the optical plate 22 according to requirements; the display panel 32 is respectively provided with a third polarizer 36 and a fourth polarizer above and below the panel module 34 38, but the fourth polarizer 38 can also be omitted in this embodiment, that is, the second polarizer 16 of the anti-peep control device 10 can be shared under the panel module 34; in addition, between the liquid crystal cell 12 and the first polarizer 14, A compensation film 18 may optionally be disposed between the liquid crystal cell 12 and the second polarizer 16 . The type of the compensation film 18 has been disclosed above, and will not be repeated here.

Fig. 13 is a schematic cross-sectional structure diagram of a display according to a fifth embodiment of the present invention. As shown in Fig. 13 , a display 30e is equipped with a backlight module 20. The peep control device 10 is disposed above the display panel 32 . The display panel 32 is respectively equipped with a fourth polarizer 38 and a third polarizer 36 above and below the panel module 34, and the fourth polarizer 38 is adjacent to the first polarizer 14 (the first polarizer 14 can use a reflective polarizer as required) ), but the fourth polarizer 38 can also be omitted in this embodiment, that is, the first polarizer 14 of the anti-peeping control device 10 can be shared above the panel module 34 . In addition, a compensation film 18 can be optionally arranged between the liquid crystal cell 12 and the first polarizer 14, and between the liquid crystal cell 12 and the second polarizer 16. The type of the compensation film 18 has been disclosed above, and will not be repeated here. .

In summary, the utility model can achieve the following effects:

1) The anti-peep control is achieved by whether the voltage is applied to the liquid crystal cell of the anti-peep control device, that is, the electric control method is used to switch the anti-peep effect.

2) Adjust the direction of the penetration axis of the polarizer according to the special requirements of the display to achieve an asymmetric anti-peeping effect.

3) When matched with a display panel such as a liquid crystal display panel (LCD) or a light-emitting diode display panel (OLED), the use of a polarizer can be reduced, which not only achieves anti-peeping control effects, but also meets cost and thickness reduction and Brightness maintenance requirements.

4) The anti-peep control device can be used with a reflective polarizer to reflect ambient light and enhance the anti-peep effect.

5) When the backlight module uses a reverse prism sheet and the deflection of the extension direction of the prism columns of the reverse prism sheet results in a viewing angle deviation, the anti-peeping control device can be used to correct the deviation of the viewing angle.

The above is only a preferred embodiment of the utility model, and should not limit the scope of implementation of the utility model, that is, all simple equivalent changes and modifications made according to the claims of the utility model and the description are still valid. It belongs to the scope covered by the utility model patent. In addition, any embodiment or claim of the utility model does not need to achieve all the objects or advantages or features disclosed in the utility model. In addition, the abstract part and the title of the invention are only used to assist the retrieval of patent documents, and are not used to limit the scope of rights of the utility model. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name elements (elements) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. upper or lower limit.

reference sign

10, 10a: anti-peep control device

12: LCD box

121: Substrate

122: electrode layer

123: the first alignment layer

123r: the first alignment direction

124: Second alignment layer

124r: Second alignment direction

125: liquid crystal material

14: The first polarizer

141r: first axis

142: bottom edge

16: Second polarizer

161r: Second axis

162: bottom edge

θ: included angle

18: Compensation film

20: Backlight module

22: Optical board

221: light incident surface

222: Light-emitting surface

24: light source

26: Inverse prism sheet

261r: Extension direction

262: Reference line

263: bottom edge

30a, 30b, 30c, 30d, 30e: displays

32: Display panel

34: Panel module

36: The third polarizer

38: The fourth polarizer

Claims (16)

1. An anti-peep control device, characterized in that it comprises a first polarizer, a second polarizer and a liquid crystal cell, The first polarizer includes a first transmission axis with a first axis; The second polarizer is arranged opposite to the first polarizer, the second polarizer includes a second transmission axis with a second axial direction, the first transmission axis and the second transmission axis The relationship between at least meets one of the following conditions: 1. There is an angle between the first axis and the second axis, and the angle is between 5 degrees and 15 degrees; and 2. The The first axis is parallel to the second axis, and the first axis is neither parallel nor perpendicular to any side of the first polarizer, and the second axis is neither parallel nor perpendicular on either side of the second polarizer; The liquid crystal cell is disposed between the first polarizer and the second polarizer, the liquid crystal cell includes a first alignment layer, a second alignment layer and a liquid crystal material, and the liquid crystal material is disposed on the first polarizer Between the alignment layer and the second alignment layer, the included angle between the first alignment direction of the first alignment layer and the first axis is selected from one of 0±5 degrees and 90±5 degrees, An included angle between the second alignment direction of the second alignment layer and the second axis is selected from one of 0±5 degrees and 90±5 degrees. 2. The anti-peep control device according to claim 1, wherein the liquid crystal cell further comprises two substrates and two electrode layers, The two substrates are disposed between the first polarizer and the second polarizer, and the first alignment layer, the second alignment layer, and the liquid crystal material are disposed between the two substrates; The two electrode layers are arranged between the two substrates, and the first alignment layer, the second alignment layer and the liquid crystal material are arranged between the two electrode layers. 3. The anti-peeping control device according to claim 1, wherein the liquid crystal material is selected from one of positive liquid crystal and negative liquid crystal. 4. The anti-peeping control device according to claim 1, further comprising at least one compensation film disposed between the liquid crystal cell and the first polarizer, or between the liquid crystal cell and the first polarizer between the two polarizers. 5. The anti-peeping control device according to claim 4, characterized in that, the type of each of the compensation films can be selected from one of the following four types or a combination thereof: 1. The optical axis of the film is parallel to that of the film A uniaxial structure compensation film on the surface; 2. a uniaxial structure compensation film in which the optical axis of the film is perpendicular to the surface of the film; 3. a uniaxial structure compensation film in which the optical axis of the film is at an inclination angle to the surface of the film; and 4. biaxial compensation film. 6. The anti-peeping control device according to claim 1, wherein the first polarizer is a reflective polarizer, and the second polarizer is an absorbing polarizer. 7. A backlight module, characterized in that it comprises an optical plate, a light source, and the anti-peeping control device according to any one of claims 1 to 6, The optical plate has a light incident surface and a light exit surface; The light source is arranged beside the light incident surface; The anti-peeping control device according to any one of claims 1 to 6 is disposed opposite to the light emitting surface of the optical plate, and the first polarizer faces the optical plate. 8. The backlight module according to claim 7, further comprising a reverse prism sheet disposed between the anti-peeping control device and the light emitting surface of the optical plate. 9. The backlight module according to claim 8, wherein the reverse prism sheet has a plurality of prism columns arranged in parallel, facing the light-emitting surface of the optical plate, and the extension directions of the prism columns are opposite to each other. There is a deflection angle between the reference line and the reference line by deflecting a first direction, the reference line is perpendicular to any opposite side of the reverse prism sheet, and the first alignment of the anti-peeping control device The direction is deflected toward a second direction relative to the reference line. 10. The backlight module according to claim 9, wherein the second direction is opposite to the first direction. 11. A display, characterized in that it comprises a display panel and a backlight module as claimed in claim 7, The display panel includes a panel module; The display panel is disposed on a side of the anti-peep control device away from the optical plate, or disposed between the optical plate and the anti-peep control device. 12. The display according to claim 11, wherein the display panel is disposed on a side of the anti-peeping control device away from the optical plate, and the display panel further comprises a third polarizer, the The third polarizer is disposed on a side of the panel module away from the anti-peeping control device. 13. The display according to claim 12, wherein the display panel further comprises a fourth polarizer, which is arranged on the side of the panel module facing the anti-peeping control device, and is connected to the second polarizer. The polarizers are adjacent to each other, the fourth polarizer includes a fourth transmission axis with a fourth axis, the fourth axis and the second axis are neither parallel nor perpendicular to each other, and the first axis parallel to the second axis. 14. The display according to claim 11, wherein the display panel is disposed between the optical plate and the anti-peep control device, the display panel further comprises a third polarizer, and the third The polarizer is disposed on a side of the panel module facing the optical plate. 15. The display according to claim 14, further comprising a fourth polarizer disposed on a side of the panel module away from the optical plate and adjacent to the first anti-peeping control device. A polarizer. 16. The display according to claim 11, wherein the panel module is a transverse electric field switching panel module.