Peep-proof device

Abstract

The invention discloses a peep-proof device. The peep-proof device comprises a first polaroid, a second polaroid, a peep-proof medium layer, a first alignment layer and a second alignment layer, the first polaroid comprises a first penetrating shaft, the second polaroid is arranged opposite to the first polaroid and comprises a second penetrating shaft, and the peep-proof medium layer is arranged between the first polaroid and the second polaroid. The first alignment layer is arranged between the first polaroid and the peep-proof medium layer and has a first alignment direction. The second alignment layer is arranged between the second polaroid and the peep-proof medium layer and has a second alignment direction. A first included angle is formed between the first penetrating shaft and the second penetrating shaft, and the first included angle is not larger than 90 degrees. A second included angle is formed between the first alignment direction and the second alignment direction, and the second included angle is smaller than the first included angle.

Description

Technical Field

[0001] This invention relates to a privacy device, and more particularly to a privacy device capable of preventing peeping from three sides. Background Technology

[0002] Electronic devices are indispensable products today, and electronic devices with display functions, such as screens, laptops, smartphones, wearable devices, smartwatches, and automotive displays, are widely used in many places.

[0003] Based on users' needs for privacy when viewing displays, and / or the need to prevent specific individuals from viewing the displays (e.g., preventing drivers from looking at in-vehicle displays while driving, or avoiding light from in-vehicle displays reflecting off the windshield and interfering with driving), electronic devices with display functions can also be equipped with privacy screens. This makes it difficult to view the screen outside the designated viewing area of ​​the privacy screen, thus achieving the effect of privacy protection. In recent years, the industry has focused on designing privacy screens to better suit the required usage scenarios. Summary of the Invention

[0004] The purpose of this invention is to provide a privacy device that, through the design of a polarizer and an alignment layer, enables privacy protection on three sides.

[0005] To address the aforementioned technical problems, the present invention provides a privacy screen device, comprising a first polarizer, a second polarizer, a privacy media layer, a first alignment layer, and a second alignment layer. The first polarizer includes a first transmission axis. The second polarizer is disposed opposite to the first polarizer and includes a second transmission axis. The privacy media layer is disposed between the first polarizer and the second polarizer. The first alignment layer is disposed between the first polarizer and the privacy media layer and has a first alignment direction. The second alignment layer is disposed between the second polarizer and the privacy media layer and has a second alignment direction. A first angle is formed between the first transmission axis and the second transmission axis, and the first angle is not greater than 90 degrees. A second angle is formed between the first alignment direction and the second alignment direction, and the second angle is smaller than the first angle. Attached Figure Description

[0006] Figure 1 The diagram shown is a cross-sectional view of a privacy device according to an embodiment of the present invention.

[0007] Figure 2 The diagram shown is a schematic representation of a first polarizer, a second polarizer, a first alignment layer, and a second alignment layer of a privacy device according to an embodiment of the present invention.

[0008] Figure 3The diagram shows the brightness of the privacy device of the first embodiment of the present invention from various angles in the first mode and the second mode.

[0009] Figure 4 The diagram shows the brightness of the privacy device according to the second embodiment of the present invention at various angles in the first and second modes.

[0010] Figure 5 The diagram shows the brightness of the privacy device according to the third embodiment of the present invention at various angles in the first and second modes.

[0011] Figure 6 The diagram shows the brightness of the privacy device according to the fourth embodiment of the present invention at various angles in the first and second modes.

[0012] Figure 7 The diagram shows the brightness of the privacy device according to the fifth embodiment of the present invention at various angles in the first and second modes.

[0013] Figure 8 The diagram shows the brightness of the privacy device according to the sixth embodiment of the present invention at various angles in the first and second modes.

[0014] Figure 9 The diagram shows the brightness of the privacy device according to the seventh embodiment of the present invention at various angles in the first and second modes.

[0015] Figure 10 The diagram shows the brightness of the privacy device according to the eighth embodiment of the present invention at various angles in the first and second modes.

[0016] Figure 11 The diagram shows the brightness of the privacy device according to the ninth embodiment of the present invention at various angles in the first and second modes.

[0017] Figure 12 The diagram shows the brightness of the privacy device according to the tenth embodiment of the present invention at various angles in the first and second modes.

[0018] Figure 13 The diagram shows the brightness of the privacy device according to the eleventh embodiment of the present invention from various angles in the first and second modes.

[0019] Figure 14 The diagram shows the brightness of the privacy device according to the twelfth embodiment of the present invention at various angles in the first and second modes.

[0020] Figure 15 The diagram shows the brightness of the privacy device according to the thirteenth embodiment of the present invention at various angles in the first and second modes.

[0021] Figure 16The diagram shows the brightness of the privacy device according to the fourteenth embodiment of the present invention at various angles in the first and second modes.

[0022] Figure 17 The diagram shows the brightness of the privacy device according to the fifteenth embodiment of the present invention at various angles in the first and second modes.

[0023] Explanation of reference numerals in the attached drawings: 100 - privacy device; 110 - first substrate; 120 - second substrate; 132 - first polarizer; 132a - first transmission axis; 134 - second polarizer; 134a - second transmission axis; 140 - privacy medium layer; 142 - first alignment layer; 142d - first alignment direction; 144 - second alignment layer; 144d - second alignment direction; M1 - first mode; M2 - second mode; R1, R2, R3 - regions; X, Y, Z - directions; θ1 - first included angle; θ2 - second included angle. Detailed Implementation

[0024] To enable those skilled in the art to further understand the present invention, preferred embodiments are described below, along with a detailed description of the invention's structure and desired effects in conjunction with the accompanying drawings. It should be noted that the drawings are simplified schematic diagrams; therefore, only elements and combinations related to the present invention are shown to provide a clearer description of the basic structure or implementation method of the invention. Actual elements and layouts may be more complex. Furthermore, for ease of explanation, the elements shown in the various drawings are not drawn to scale according to the actual number, shape, and size; the detailed scale can be adjusted according to design requirements.

[0025] In the specification and claims of this invention, the terms "comprising," "containing," and "having" are open-ended terms and should therefore be interpreted as "containing but not limited to...". Thus, when the terms "comprising," "containing," and / or "having" are used in the description of this invention, they specify the presence of the corresponding features, areas, steps, operations, and / or components, but do not exclude the presence of one or more of the corresponding features, areas, steps, operations, and / or components.

[0026] In the specification and claims of this invention, when “component A1 is formed by B1”, it means that the formation of component A1 includes or uses B1, and the formation of component A1 does not exclude the presence or use of one or more other features, areas, steps, operations and / or components.

[0027] In this specification and claims, the term "horizontal direction" refers to a direction parallel to a horizontal plane; the term "horizontal plane" refers to a plane parallel to directions X and Y in the drawings; and the term "vertical direction" refers to a direction parallel to direction Z in the drawings, where directions X, Y, and Z are perpendicular to each other (i.e., the horizontal direction is perpendicular to direction Z). In this specification and claims, the term "top view" refers to the result of viewing along the vertical direction. In this specification and claims, the term "section" refers to the result of viewing the structure cut along the vertical direction from a horizontal perspective.

[0028] In this specification and claims, the term "overlap" means that two components overlap in the direction Z, and unless otherwise specified, the term "overlap" includes partial overlap or complete overlap, wherein the two components may be in direct contact with each other or there may be a spacer between the two components.

[0029] In this specification and claims, the term "approximately" is generally interpreted as being within ±10% of a given value, or within ±5%, ±3%, ±2%, ±1%, or ±0.5% of a given value.

[0030] The ordinal numbers used in the specification and claims of this invention, such as "first," "second," etc., to modify elements, do not in themselves imply or represent any prior ordinal number of that element (or those elements), nor do they represent the order of one element with another, or the order of manufacturing methods. The use of these ordinal numbers is solely to clearly distinguish one named element from another element with the same name. The claims and specification may not use the same terminology; therefore, a first component in the specification may be a second component in the claims.

[0031] It should be understood that the features listed below can be replaced, recombined, or mixed in several different embodiments to complete other embodiments without departing from the spirit of the invention. Features between embodiments can be arbitrarily mixed and combined as long as they do not violate the spirit of the invention or conflict with it.

[0032] Please refer to Figure 1 and Figure 2 , Figure 1 The figure shown is a cross-sectional schematic diagram of an anti-peeping device according to an embodiment of the present invention. Figure 2 The diagram shown illustrates a first polarizer, a second polarizer, a first alignment layer, and a second alignment layer of a privacy device according to an embodiment of the present invention. Figure 1As shown, the privacy device 100 may include a first substrate 110 and a second substrate 120, wherein the first substrate 110 and the second substrate 120 are disposed opposite to each other. The materials of the first substrate 110 and the second substrate 120 may be the same or different, and the first substrate 110 and the second substrate 120 may each be a rigid substrate or a flexible substrate, and may include, depending on their type, materials such as glass, plastic, quartz, sapphire, polymers (e.g., polyimide (PI), polyethylene terephthalate (PET)), other suitable materials or combinations thereof, but are not limited thereto. In addition, the shape and size of the first substrate 110 and the second substrate 120 may be designed according to requirements. It should be noted that the normal direction of the first substrate 110 and the second substrate 120 may be parallel to the Z direction.

[0033] like Figure 1 As shown, the privacy device 100 may include a first polarizer 132 and a second polarizer 134 disposed opposite to each other. The first polarizer 132 is disposed on one side of the first substrate 110, and the first substrate 110 is located between the first polarizer 132 and the second substrate 120. The second polarizer 134 is disposed on one side of the second substrate 120, and the second substrate 120 is located between the second polarizer 134 and the first substrate 110. Figure 2 As shown, the first polarizer 132 includes a first transmission axis 132a, and the second polarizer 134 includes a second transmission axis 134a, wherein the first polarizer 132 and the second polarizer 134 are parallel to each other, and the first transmission axis 132a and the second transmission axis 134a are not parallel to each other.

[0034] like Figure 1 As shown, the privacy device 100 may include a privacy dielectric layer 140 disposed between the first substrate 110 and the second substrate 120, and between the first polarizer 132 and the second polarizer 134. In this invention, the privacy dielectric layer 140 may include any suitable dielectric material. For example, the privacy dielectric layer 140 may include liquid crystal molecules (e.g., positive liquid crystal molecules, negative liquid crystal molecules), but is not limited thereto. Furthermore, in this embodiment, the dielectric material contained in the privacy dielectric layer 140 can be adjusted in any suitable manner to achieve a privacy effect for the privacy device 100. In some embodiments, electrode layers (not shown) are disposed on both sides of the privacy dielectric layer 140, and the privacy state of the privacy dielectric layer 140 is changed by applying a bias voltage to the two electrode layers. In this embodiment, the privacy media layer 140 can switch between a first bias state (or non-privacy state) and a second bias state (or privacy state) so that the privacy device 100 can switch between a first mode (or sharing mode) and a second mode (or privacy mode).

[0035] like Figure 1 As shown, the privacy device 100 may include a first alignment layer 142 and a second alignment layer 144 disposed between the first substrate 110 and the second substrate 120 for aligning with the privacy media layer 140. Figure 1 and Figure 2 In this embodiment, a first alignment layer 142 is disposed between the first substrate 110 and the privacy medium layer 140 (i.e., between the first polarizer 132 and the privacy medium layer 140) and has a first alignment direction 142d. A second alignment layer 144 is disposed between the second substrate 120 and the privacy medium layer 140 (i.e., between the second polarizer 134 and the privacy medium layer 140) and has a second alignment direction 144d. The first alignment layer 142 and the second alignment layer 144 are parallel to each other, and the first alignment direction 142d and the second alignment direction 144d are not parallel to each other. In this invention, the first alignment layer 142 and the second alignment layer 144 may comprise any material suitable for alignment and are aligned in a suitable manner. For example, the first alignment layer 142 and the second alignment layer 144 may comprise polyimide (PI), but are not limited thereto.

[0036] In some embodiments, the privacy device 100 may include a first control electrode and a second control electrode (not shown) for controlling the privacy media layer 140. A change in the electric field caused by applying a bias voltage to the first and second control electrodes can be used to control the privacy media layer 140. The first and second control electrodes can be designed as needed. For example, the first and second control electrodes may be disposed on opposite sides of the privacy media layer 140 (i.e., the privacy media layer 140 is located between the first and second control electrodes in the Z direction), wherein the first control electrode is disposed between the first substrate 110 and the first alignment layer 142, and the second control electrode is disposed between the second substrate 120 and the second alignment layer 144, but this is not a limitation. For example, the first and second control electrodes may be disposed on the same side of the privacy media layer 140, wherein the first and second control electrodes may be disposed between the first substrate 110 and the first alignment layer 142 or between the second substrate 120 and the second alignment layer 144, but this is not a limitation. Furthermore, the first and second control electrodes can be transparent electrodes to allow light to pass through them. For example, the materials of the first and second control electrodes may include indium tin oxide (ITO), indium zinc oxide (IZO), other suitable transparent conductive materials, or combinations thereof.

[0037] In this invention, the number of the first control electrode and the second control electrode can be designed according to requirements. For example, the number of the first control electrode and the number of the second control electrode can both be one. These first and second control electrodes can control the state of the entire privacy shield layer 140, controlling it to be in a first bias state (or non-privacy state) or a second bias state (or privacy state), thereby controlling the privacy device 100 to be in a first mode (or sharing mode) or a second mode (or privacy mode), but this is not a limitation. For example, the number of the first control electrode and / or the second control electrode can be greater than one, so that the electric field generated by the first and second control electrodes can regionally control the state of the privacy shield layer 140, enabling the privacy device 100 to provide zoned privacy protection, but this is not a limitation.

[0038] The first and second control electrodes can generate corresponding electric fields based on the received electrical signals, and the material in the privacy shield layer 140 (e.g., liquid crystal molecules) will change accordingly (e.g., rotate) according to the electric field to adjust the state of the privacy shield layer 140 (e.g., the privacy shield layer 140 can switch between a first bias state and a second bias state). In this embodiment, when the privacy shield layer 140 is in the first bias state, the privacy device 100 is in the first mode (or sharing mode) and the privacy function is turned off; when the privacy shield layer 140 is in the second bias state, the privacy device 100 is in the second mode (or privacy mode) and the privacy function is turned on. For example, when the voltage difference between the first and second control electrodes is equal to 0, the privacy device 100 turns off the privacy function; when the absolute value of the voltage difference between the first and second control electrodes is greater than 0, the privacy device 100 turns on the privacy function, but this is not a limitation.

[0039] In this invention, when the privacy device 100 is in the second mode (or privacy mode), please refer to... Figure 2 The privacy device 100 can simultaneously provide privacy protection for three sides, such as sides A, B, and C. When an observer looks from side A, side B, or side C, the visible area of ​​the privacy device 100 has a specific privacy protection effect. However, the privacy device 100 does not provide privacy protection for the side D.

[0040] That is, when the privacy device 100 is in the second mode and the privacy function is activated, the light emitted towards side A, side B, and side C is additionally restricted compared to the light emitted towards side D. This results in the viewer having difficulty seeing the display screen of the electronic device (e.g., direction Z) when the angle between the viewer's line of sight from side A, side B, or side C and the normal direction of the light-emitting surface of the electronic device equipped with the privacy device 100 (e.g., a privacy display device including the privacy device 100 and the display device arranged overlapping each other) is greater than a certain angle. Alternatively, the viewer may see an unclear display screen. When the privacy device 100 is in the first mode and the privacy function is deactivated, the light emitted towards side A, side B, and side C is not additionally restricted. Accordingly, in the privacy device 100, the A-side viewing angle range in the first mode is greater than the A-side viewing angle range in the second mode, the B-side viewing angle range in the first mode is greater than the B-side viewing angle range in the second mode, and the C-side viewing angle range in the first mode is greater than the C-side viewing angle range in the second mode.

[0041] In order to enable the privacy device 100 to simultaneously protect against the A-side view, the B-side view, and the C-side view in the second mode, but not against the D-side view, the first penetration axis 132a of the first polarizer 132, the second penetration axis 134a of the second polarizer 134, the first alignment direction 142d of the first alignment layer 142, and the second alignment direction 144d of the second alignment layer 144 can be appropriately designed.

[0042] In this invention, such as Figure 2 As shown, the first penetration axis 132a and the second penetration axis 134a are not parallel to each other, resulting in a first included angle θ1 between them. The first alignment direction 142d and the second alignment direction 144d are also not parallel to each other, resulting in a second included angle θ2 between them. In some embodiments, the first penetration axis 132a, the second penetration axis 134a, the first alignment direction 142d, and the second alignment direction 144d are... Figure 2 The direction may not be parallel to or perpendicular to directions X and Y. It should be noted that, in this invention, as... Figure 2 As shown, the range of the second included angle θ2 is within the range of the first included angle θ1. It should be noted that the first penetration axis 132a, the second penetration axis 134a, the first alignment direction 142d, and the second alignment direction 144d, even when they are not parallel and not perpendicular to directions X and Y, can be designed according to requirements, so that the relationship between the first included angle θ1 and the second included angle θ2 relative to direction Y can be adjusted according to requirements. For example, in... Figure 2In the equation, direction Y can bisect the first included angle θ1 and the second included angle θ2 (that is, direction Y is the angle bisector of the first included angle θ1 and the second included angle θ2), but is not limited to this.

[0043] like Figure 2 As shown, the second included angle θ2 is smaller than the first included angle θ1 to give the second mode the desired privacy protection effect. For example, the second included angle θ2 may be at least 10 degrees smaller than the first included angle θ1, but is not limited thereto. For example, the first included angle θ1 may be less than or equal to 80 degrees, less than or equal to 90 degrees, or less than or equal to 100 degrees (i.e., the first included angle θ1 may not be greater than 80 degrees, 90 degrees, or 100 degrees), and the second included angle θ2 may be less than 90 degrees (i.e., the second included angle θ2 may be an acute angle), but is not limited thereto. For example, the first included angle θ1 may be greater than or equal to 60 degrees, such that the first included angle θ1 may be greater than or equal to 60 degrees and less than or equal to 80 degrees, or the first included angle θ1 may be greater than or equal to 60 degrees and less than or equal to 90 degrees, or the first included angle θ1 may be greater than or equal to 60 degrees and less than or equal to 100 degrees, but is not limited thereto. For example, the second included angle θ2 can be greater than or equal to 30 degrees and less than or equal to 70 degrees, but is not limited to this.

[0044] On the other hand, Figure 2 In this configuration, the first alignment direction 142d of the first alignment layer 142 and the second alignment direction 144d of the second alignment layer 144 are not parallel and not perpendicular to the first penetration axis 132a and the second penetration axis 134a, so that the second mode has the desired privacy protection effect. In some embodiments, when the second included angle θ2 is at least 10 degrees less than the first included angle θ1, the included angle between the first alignment direction 142d of the first alignment layer 142 and the first penetration axis 132a may be greater than or equal to 5 degrees, and the included angle between the second alignment direction 144d of the second alignment layer 144 and the second penetration axis 134a may be greater than or equal to 5 degrees, but is not limited thereto. For example, the angle between the first alignment direction 142d of the first alignment layer 142 and the first penetration axis 132a may be greater than or equal to 5 degrees and less than or equal to 25 degrees, and the angle between the second alignment direction 144d of the second alignment layer 144 and the second penetration axis 134a may be greater than or equal to 5 degrees and less than or equal to 25 degrees, but is not limited thereto.

[0045] In addition, in this invention, such as Figure 2 As shown, the first alignment direction 142d of the first alignment layer 142 and the second alignment direction 144d of the second alignment layer 144 are twisted at a second included angle θ2 to give the second mode the desired privacy protection effect. It should be noted that when the first alignment direction 142d and the second alignment direction 144d are "twisted" at the second included angle θ2, the second included angle θ2 originates from the beginning of either the first alignment direction 142d or the second alignment direction 144d. Figure 2The arrowhead in the middle) and the tail end of the other of the first alignment direction 142d and the second alignment direction 144d ( Figure 2 The first alignment direction 142d and the second alignment direction 144d are sandwiched by the straight end of the line. In other words, when the first alignment direction 142d and the second alignment direction 144d are "twisted" at the second included angle θ2, the first alignment direction 142d and the second alignment direction 144d have opposite components parallel to the direction Y. For example, in Figure 2 In the first alignment direction 142d, there is a positive component parallel to the direction Y, and the second alignment direction 144d has a negative component parallel to the direction Y, such that the second included angle θ2 is sandwiched between the head end (arrow end) of the first alignment direction 142d and the tail end (straight line end) of the second alignment direction 144d. Therefore, the first alignment direction 142d can become the second alignment direction 144d after being twisted by the second included angle θ2.

[0046] The following describes several embodiments illustrating the privacy protection effects of various combinations of the first included angle θ1 and the second included angle θ2. Please refer to... Figures 3 to 17 , Figures 3 to 17 The diagram shows the brightness of the privacy device 100 in the first to fifteenth embodiments of the present invention at various angles in the first and second modes. The first included angle θ1 and the second included angle θ2 in the first to fifteenth embodiments can be referred to Table 1.

[0047] Table 1: First included angle θ1 and second included angle θ2 in the first to fifteenth embodiments

[0048]

[0049]

[0050] In the first embodiment (e.g.) Figure 3 (as shown) to the fifteenth embodiment (as shown) Figure 17 In the first mode M1 (as shown), because the privacy function is off, onlookers can see the light passing through the privacy device 100 from all angles. It should be noted that, according to... Figures 3 to 17 As shown, when the first included angle θ1 and / or the second included angle θ2 change, the brightness of each viewpoint in the first mode M1 changes only slightly.

[0051] In the first embodiment (e.g.) Figure 3 (as shown) to the fifteenth embodiment (as shown) Figure 17 In the second mode M2 ​​(as shown), because the privacy function is enabled, the brightness diagrams for each viewing angle (shown in the figure) show that... Figures 3 to 5In the example, viewing angle A has a low-brightness area R1, viewing angle B has a low-brightness area R2, and viewing angle C has a low-brightness area R3. This allows the privacy device 100 to simultaneously protect against peeping from viewing angles A, B, and C in the second mode M2. Furthermore, in the brightness diagram of each viewing angle, viewing angle D does not have a low-brightness area; therefore, the privacy device 100 does not protect against peeping from viewing angle D in the second mode M2. The relative relationships of sides A, B, C, and D can be found in the following diagram. Figure 2 .

[0052] In the second mode M2, when the first included angle θ1 is changed while the second included angle θ2 is maintained (with... Figure 3 The first embodiment shown to Figure 5 The third embodiment shown is an example), and the privacy protection effect increases as the first included angle θ1 increases. In the second mode M2, when the first included angle θ1 is maintained and the second included angle θ2 is changed (e.g., the first included angle θ1 is maintained at 80 degrees, so that...), the privacy protection effect increases as the first included angle θ1 increases as the second included angle θ2 increases as the second included angle θ2 increases as the second included angle θ1 ... Figure 5 , Figure 8 , Figure 9 , Figure 12 and Figure 16 The illustrated embodiment is an example, and the privacy protection effect decreases as the second included angle θ2 increases.

[0053] According to the first embodiment (e.g.) Figure 3 (as shown) to the fifteenth embodiment (as shown) Figure 17 As shown), the first included angle θ1 can be greater than or equal to 60 degrees and less than or equal to 80 degrees, or the first included angle θ1 can be greater than or equal to 60 degrees and less than or equal to 90 degrees, or the first included angle θ1 can be greater than or equal to 60 degrees and less than or equal to 100 degrees, while the second included angle θ2 can be greater than or equal to 30 degrees and less than or equal to 70 degrees.

[0054] According to the first embodiment (e.g.) Figure 3 (as shown) to the sixth embodiment (as shown) Figure 8 As shown), when the second included angle θ2 is greater than or equal to 30 degrees and less than or equal to 40 degrees, the first included angle θ1 can be greater than or equal to 60 degrees and less than or equal to 80 degrees, but is not limited thereto. According to the seventh embodiment (e.g.) Figure 9 (as shown) to the twelfth embodiment (as shown) Figure 14 As shown), when the second included angle θ2 is greater than or equal to 50 degrees and less than or equal to 60 degrees, the first included angle θ1 can be greater than or equal to 70 degrees and less than or equal to 90 degrees, but is not limited thereto. According to the thirteenth embodiment (e.g....), Figure 15 (as shown) to the fifteenth embodiment (as shown) Figure 17 As shown in the figure, when the second included angle θ2 is 70 degrees, the first included angle θ1 can be greater than or equal to 80 degrees and less than or equal to 100 degrees, or the first included angle θ1 can be greater than or equal to 80 degrees and less than or equal to 90 degrees, but is not limited to this.

[0055] In some embodiments, the privacy device 100 may be overlapped with a display device to form a privacy display device, wherein the display device may be, for example, a non-self-emissive display (e.g., a display including a backlight module) or a self-emissive display (e.g., an active-matrix organic light-emitting diode (AMOLED) display). In some embodiments, the privacy device 100 may be overlapped with a vehicle display screen to form a privacy-protected vehicle display screen (e.g., a display in a vehicle entertainment system), making it difficult for the driver to directly see the display screen, and reducing (or even preventing) the brightness of the display screen reflected onto the windshield, thereby improving driving safety.

[0056] In summary, by appropriately designing the first penetration axis of the first polarizer, the second penetration axis of the second polarizer, the first alignment direction of the first alignment layer, and the second alignment direction of the second alignment layer, the present invention enables the privacy device to simultaneously protect against peeping from three side views, without protecting against peeping from a fourth side view.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A privacy device, characterized in that, The application relates to a privacy device, comprising: a first polarizer comprising a first pass axis; a second polarizer disposed opposite to the first polarizer and comprising a second pass axis; a privacy medium layer disposed between the first polarizer and the second polarizer; a first alignment layer disposed between the first polarizer and the privacy medium layer and having a first alignment direction; and a second alignment layer disposed between the second polarizer and the privacy medium layer and having a second alignment direction; wherein the first pass axis and the second pass axis have a first included angle, and the first included angle is not greater than 90 degrees; wherein the first alignment direction and the second alignment direction have a second included angle, and the second included angle is less than the first included angle. The second included angle is less than the first included angle by at least 10 degrees.

2. The privacy device of claim 1, wherein, The first alignment direction of the first alignment layer and the second alignment direction of the second alignment layer are neither parallel nor perpendicular to the first pass axis and the second pass axis.

3. The privacy device of claim 1, wherein, The included angle between the first alignment direction of the first alignment layer and the first pass axis is greater than or equal to 5 degrees and less than or equal to 25 degrees.

4. The privacy device of claim 1, wherein, The first alignment direction of the first alignment layer and the second alignment direction of the second alignment layer have a twisted relationship at the second included angle.

5. The privacy device of claim 1, wherein, The second included angle is greater than or equal to 30 degrees and less than or equal to 70 degrees.

6. The privacy device of claim 1, wherein, The first included angle is greater than or equal to 60 degrees and less than or equal to 90 degrees.

7. The privacy device of claim 1, wherein, The second included angle is greater than or equal to 30 degrees and less than or equal to 40 degrees, and the first included angle is greater than or equal to 60 degrees and less than or equal to 80 degrees.

8. The privacy device of claim 1, wherein, The second included angle is greater than or equal to 50 degrees and less than or equal to 60 degrees, and the first included angle is greater than or equal to 70 degrees and less than or equal to 90 degrees.

9. The privacy device of claim 1, wherein, The second included angle is 70 degrees, and the first included angle is greater than or equal to 80 degrees and less than or equal to 90 degrees.

10. The privacy device of claim 1, wherein, The first alignment direction and the second alignment direction are not parallel to each other.

11. The privacy device of claim 1, wherein, The privacy device simultaneously prevents viewing from three sides.

12. The privacy device of claim 1, wherein, The angle range of the second included angle is within the angle range of the first included angle.

13. The privacy device of claim 1, wherein, ​

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