Anti-peeping display device and operation method thereof

Abstract

A peep-proof display device comprises a backlight module, a display module and a visual angle control module. The backlight module emits collimated light, wherein the light brightness ratio of the collimated light in the 45-degree viewing angle direction of the light-emitting surface of the backlight module to the light brightness ratio of the collimated light in the positive viewing angle direction of the light-emitting surface of the backlight module is 0.001%-0.4%. The display module is overlapped with the backlight module. The visual angle control module is located between the backlight module and the display module and comprises a first driving electrode layer, a second driving electrode layer and a first liquid crystal layer. The first driving electrode layer is located between the backlight module and the display module and is provided with a plurality of first slits. The second driving electrode layer is located between the first driving electrode layer and the display module and is provided with a plurality of second slits, wherein the extending directions of the plurality of second slits intersect with the extending directions of the plurality of first slits. The first liquid crystal layer is located between the first driving electrode layer and the second driving electrode layer. In addition, the invention further provides an operation method of the peep-proof display equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to a display device and an operating method thereof, and particularly to a privacy display device and an operating method thereof. BACKGROUND

[0002] The existing notebook computer privacy technology must use a collimated backlight module due to privacy specification requirements. However, the collimated backlight module not only narrows the left and right viewing angle brightness, but also narrows the up and down viewing angle brightness, resulting in that the up and down viewing angle cannot provide a sharing mode, and there is a significant bright and dark change in the up and down viewing angle, resulting in that the up and down viewing angle also cannot provide a good privacy mode.

[0003] How to independently provide a privacy and sharing mode in the up and down viewing angle direction and the left and right viewing angle direction becomes a problem to be solved. SUMMARY

[0004] The present application provides a privacy display device, which can independently provide a privacy and sharing mode in the up and down viewing angle direction and the left and right viewing angle direction.

[0005] The present application provides an operating method of a privacy display device, which can independently provide a privacy and sharing mode in the up and down viewing angle direction and the left and right viewing angle direction.

[0006] According to an embodiment of the present application, a privacy display device is provided, which includes a backlight module, a display module, and a viewing angle control module. The backlight module emits collimated light, wherein a ratio of light brightness of the collimated light in a 45° viewing angle direction to that in a normal viewing angle direction of a light emitting surface of the backlight module is 0.001% to 0.4%. The display module overlaps the backlight module. The viewing angle control module is located between the backlight module and the display module, and includes a first driving electrode layer, a second driving electrode layer, and a first liquid crystal layer. The first driving electrode layer is located between the backlight module and the display module and has a plurality of first slits. The second driving electrode layer is located between the first driving electrode layer and the display module and has a plurality of second slits, wherein an extension direction of the plurality of second slits intersects an extension direction of the plurality of first slits. The first liquid crystal layer is located between the first driving electrode layer and the second driving electrode layer.

[0007] In an embodiment of the above-mentioned privacy display device, the backlight module includes a light source and a light adjusting assembly, and the light adjusting assembly is located between the light source and the viewing angle control module.

[0008] In an embodiment of the above-mentioned privacy display device, the light adjusting assembly includes a grid-shaped light blocking structure.

[0009] In an embodiment of the above-described privacy display device, the light modulation assembly includes a first light modulation sheet and a second light modulation sheet overlapping the first light modulation sheet, the first light modulation sheet includes a plurality of first light blocking structures and a plurality of first light transmitting structures arranged alternately, the second light modulation sheet includes a plurality of second light blocking structures and a plurality of second light transmitting structures arranged alternately, and an extending direction of the first light blocking structures intersects with an extending direction of the second light blocking structures.

[0010] In an embodiment of the above-described privacy display device, an extending direction of the plurality of first slits is perpendicular to an extending direction of the plurality of second slits.

[0011] In an embodiment of the above-described privacy display device, the first driving electrode layer includes a plurality of first strip electrodes defining the plurality of first slits, the plurality of first strip electrodes extend in a first direction and are arranged in a second direction, the second direction being perpendicular to the first direction.

[0012] In an embodiment of the above-described privacy display device, the second driving electrode layer includes a plurality of second strip electrodes defining the plurality of second slits, the plurality of second strip electrodes extend in the second direction and are arranged in the first direction.

[0013] In an embodiment of the above-described privacy display device, the first driving electrode layer and the second driving electrode layer are each connected to a corresponding switching assembly.

[0014] In an embodiment of the above-described privacy display device, the display module includes a first polarizing sheet, a second polarizing sheet, and a second liquid crystal layer between the first polarizing sheet and the second polarizing sheet, the first polarizing sheet is between the viewing angle control module and the second liquid crystal layer, and a pass axis direction of the first polarizing sheet is the same as an extending direction of the plurality of first slits.

[0015] In an embodiment of the above-described privacy display device, a thickness difference between the second liquid crystal layer and the first liquid crystal layer is 1 μm to 8 μm.

[0016] In an embodiment of the above-described privacy display device, a birefringence coefficient of the first liquid crystal layer is 0.09 to 0.15, and a birefringence coefficient of the second liquid crystal layer is 0.17 to 0.27.

[0017] In an embodiment of the above-described privacy display device, the viewing angle control module further includes a first alignment layer and a second alignment layer, the first alignment layer is between the first liquid crystal layer and the first driving electrode layer, and the second alignment layer is between the first liquid crystal layer and the second driving electrode layer.

[0018] In one embodiment of the above-described privacy display device, the first alignment layer has a left-right horizontal alignment, and the second alignment layer has a vertical alignment, an in-plane horizontal alignment, or a left-right horizontal alignment.

[0019] In one embodiment of the above-described privacy display device, the first alignment layer has a rubbing alignment of φ = 90° and θ = 89°, and the second alignment layer has a rubbing alignment of φ = 0° and θ = 89° or φ = 0° and θ = 1°.

[0020] In one embodiment of the above-described privacy display device, the second alignment layer has a rubbing alignment of φ = 0° and θ = 1°, and the first alignment layer has a rubbing alignment of φ = 90° and θ = 1° or φ = 90° and θ = 89°.

[0021] According to one embodiment of the present application, a method for operating a privacy display device is provided. The method includes applying a 0V voltage to a first driving electrode layer and a second driving electrode layer of the privacy display device to cause the privacy display device to provide a four-way privacy mode; applying a first operating voltage to the first driving electrode layer and applying a 0V voltage to the second driving electrode layer or not applying a voltage to the second driving electrode layer to cause the privacy display device to provide a privacy mode in an extension direction of a plurality of first slits and to provide a sharing mode in an extension direction of a plurality of second slits; applying a 0V voltage to the first driving electrode layer or not applying a voltage to the first driving electrode layer and applying a second operating voltage to the second driving electrode layer to cause the privacy display device to provide a sharing mode in the extension direction of the plurality of first slits and to provide a privacy mode in the extension direction of the plurality of second slits; or applying the first operating voltage to the first driving electrode layer and applying the second operating voltage to the second driving electrode layer to cause the privacy display device to provide a four-way sharing mode.

[0022] In one embodiment of the above-described method for operating a privacy display device, the first operating voltage and the second operating voltage are greater than 0V and less than or equal to 15V.

[0023] In order to make the above features and advantages of the present application more apparent, specific embodiments are described below in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a schematic perspective view of a privacy display device according to one embodiment of the present application.

[0025] Figure 2A FIG. 2 is a schematic cross-sectional view of a backlight module of the privacy display device according to one embodiment of the present application.

[0026] Figure 2B FIG. 3 is a schematic perspective view of a dimming assembly of the backlight module of the privacy display device according to one embodiment of the present application.

[0027] Figure 3 is a schematic cross-sectional view of a display panel of a privacy display device according to an embodiment of the present application.

[0028] Figure 4A is a schematic perspective view of a drive electrode layer of a display panel of a privacy display device according to an embodiment of the present application.

[0029] Figure 4B is a schematic perspective view of a drive electrode layer of a view angle control module of a privacy display device according to an embodiment of the present application.

[0030] Figure 5A is a schematic perspective view of a drive electrode layer of a view angle control module of a privacy display device according to an embodiment of the present application.

[0031] Figure 5B is a schematic perspective view of a drive electrode layer of a view angle control module of a privacy display device according to an embodiment of the present application.

[0032] Figure 6A is a schematic perspective view of another drive electrode layer of a view angle control module of a privacy display device according to an embodiment of the present application.

[0033] Figure 6B is a schematic perspective view of another drive electrode layer of a view angle control module of a privacy display device according to an embodiment of the present application.

[0034] Figure 7 is a schematic cross-sectional view of a liquid crystal layer of a view angle control module of a privacy display device according to an embodiment of the present application.

[0035] Figure 8A is a schematic perspective view of a privacy display device in a display mode of left and right view angle sharing and up and down view angle privacy according to an embodiment of the present application.

[0036] Figure 8B is a schematic perspective view of a privacy display device in a display mode of left and right view angle privacy and up and down view angle sharing according to an embodiment of the present application.

[0037] Figure 8C is a schematic perspective view of a privacy display device in a display mode of four-way sharing according to an embodiment of the present application.

[0038] Figure 9A is a schematic perspective view of a view angle control module of a privacy display device in a display mode of four-way privacy according to an embodiment of the present application.

[0039] Figure 9Bis a schematic perspective view of a viewing angle control module of a privacy display device in a display mode of left and right viewing angle sharing and up and down viewing angle privacy according to an embodiment of the present application.

[0040] Figure 9C is a schematic perspective view of a viewing angle control module of a privacy display device in a display mode of left and right viewing angle privacy and up and down viewing angle sharing according to an embodiment of the present application.

[0041] Figure 10A is a schematic perspective view of a viewing angle control module of a privacy display device in a display mode of four-way privacy according to an embodiment of the present application.

[0042] Figure 10B is a schematic perspective view of a viewing angle control module of a privacy display device in a display mode of left and right viewing angle sharing and up and down viewing angle privacy according to an embodiment of the present application.

[0043] Figure 10C is a schematic perspective view of a viewing angle control module of a privacy display device in a display mode of left and right viewing angle privacy and up and down viewing angle sharing according to an embodiment of the present application.

[0044] Figure 11A is a schematic perspective view of a viewing angle control module of a privacy display device in a display mode of four-way privacy according to an embodiment of the present application.

[0045] Figure 11B is a schematic perspective view of a viewing angle control module of a privacy display device in a display mode of left and right viewing angle sharing and up and down viewing angle privacy according to an embodiment of the present application.

[0046] Figure 11C is a schematic perspective view of a viewing angle control module of a privacy display device in a display mode of left and right viewing angle privacy and up and down viewing angle sharing according to an embodiment of the present application.

[0047] In the drawings:

[0048] 10~40: privacy display device

[0049] 100: backlight module

[0050] 110: light source

[0051] 120, 120A: light adjusting assembly

[0052] 200: display module

[0053] 210, 220: polarizer

[0054] 210a, 220a: transmission axis

[0055] 230: display panel

[0056] 231: lower substrate

[0057] 232: upper substrate

[0058] 233: liquid crystal layer

[0059] 234, 234A, 234B: driving electrode layer

[0060] 235: shared electrode layer

[0061] 236, 237: alignment layer

[0062] 300: view angle control module

[0063] 310, 320, 310A, 310B, 320A, 320B: driving electrode layer

[0064] 330: liquid crystal layer

[0065] 340, 350: substrate

[0066] 360, 370: alignment layer

[0067] A1, A2, B1, B2, C1, C2, D1, D2, E1, E2, F1, F2: electrode

[0068] A11, A21, B11, C11, C21, D11, E11, E21, F11: strip electrode

[0069] A1a, A12a, B1a, C1a, C12a, D1a, E1a, E12a, F1a: slit

[0070] B1, B2: light blocking structure

[0071] B3, D3, F3: insulating layer

[0072] C1, C2: light transmitting structure

[0073] CF1: first light control film

[0074] CF2: second light control film

[0075] CL: collimated light

[0076] d1, d2: thickness

[0077] DB: downward view angle direction

[0078] DL, DL1, DL2: left view angle direction

[0079] DR, DR1, DR2: right viewing angle direction

[0080] DT: upper viewing angle direction

[0081] EF1, EF3: horizontal electric field

[0082] EF2, EF4, EF7: vertical electric field

[0083] EF5: in-plane horizontal electric field

[0084] EF6: left-right horizontal electric field

[0085] LC1, LC2: liquid crystal molecule

[0086] LS: light emitting surface

[0087] TA1, TA2, TB1, TB2, TC1, TC2: switching component

[0088] TD1, TD2, TE1, TE2, TF1, TF2: switching component

[0089] W1~W9, WB1, WBa, WD1, WDa, WF1, WFa: width

[0090] x, -x, y, -y: direction

[0091] z: normal direction / direction

[0092] θ0: included angle DETAILED DESCRIPTION

[0093] Figure 1 is a schematic perspective view of a privacy display device 10 according to an embodiment of the present application. Please refer to Figure 1 , the privacy display device 10 can include a backlight module 100, a display module 200, and a viewing angle control module 300, wherein the viewing angle control module 300 is located between the backlight module 100 and the display module 200. In order to make the expression of the drawing more clear, Figure 1 some components presented in other drawings are omitted. Hereinafter, the embodiments of various components of the privacy display device 10 will be described in conjunction with the drawings, but the present application is not limited thereto.

[0094] It should first be defined that the privacy display device 10 is placed on an x-y plane, where the direction x represents an azimuth angle φ of 0 degrees, the direction y represents an azimuth angle φ of 90 degrees, the direction -x represents an azimuth angle φ of 180 degrees, and the direction -y represents an azimuth angle φ of 270 degrees. The direction z represents an elevation angle θ of 0 degrees, i.e., a normal viewing angle direction. The azimuth angle φ represents an angle deviating from the direction z. For example, φ = 0° and θ = 1° represents an azimuth on the x-z plane and 1 degree deviating from the direction z.

[0095] Reference is made to Figure 1 The backlight module 100 can include a light source 110 and a light adjusting assembly 120, which can be located between the light source 110 and the viewing angle control module 300. For example, the light source 110 includes a direct type light source, such as an array of light emitting diodes, but is not limited thereto. In some embodiments, the light source 110 includes a side type light source. The light adjusting assembly 120 is used to collimate the light emitted by the light source 110 to exit the backlight module 100, so that the backlight module 100 can provide collimated light. In some embodiments, the light adjusting assembly 120 can include a cross louver, but is not limited thereto.

[0096] Figure 2A is a schematic cross-sectional view of a backlight module 100 of a privacy display device 10 according to an embodiment of the present application. The backlight module 100 can have a light emitting surface LS, and the collimated light CL provided by the backlight module 100 can generally exit the light emitting surface LS of the backlight module 100 in a normal direction z of the light emitting surface LS to the viewing angle control module 300 and the display module 200.

[0097] In some embodiments, the ratio of the luminance of the collimated light CL measured in a direction having an angle θ0 with the normal direction z greater than or equal to 45° to the luminance of the collimated light CL measured in the normal direction z can be less than or equal to 0.4%. For example, the ratio of the luminance of the collimated light CL measured in a direction having an angle θ0 with the normal direction z of about 45° (i.e., a 45° viewing angle direction) to the luminance of the collimated light CL measured in the normal direction z (i.e., a normal viewing angle direction) is about 0.4%, and the luminance of the collimated light CL measured in a direction having an angle θ0 with the normal direction z greater than 45° is generally less than the luminance of the collimated light CL measured in a direction having an angle θ0 with the normal direction z of about 45°. In certain embodiments, the ratio of the luminance of the collimated light CL measured in a direction having an angle θ0 with the normal direction z greater than or equal to 45° to the luminance of the collimated light CL measured in the normal direction z is about 0.001% to 0.4%.

[0098] Figure 2Bis a schematic perspective view of a light modulation assembly 120A of a backlight module 100 of a privacy display device 10 according to an embodiment of the present disclosure. Figure 2B The light modulation assembly 120A shown can replace Figure 1 the light modulation assembly 120 shown. The light modulation assembly 120A can include a first light modulation film CF1 and a second light modulation film CF2, where the second light modulation film CF2 overlaps the first light modulation film CF1, and the light source 110, the first light modulation film CF1, and the second light modulation film CF2 can be arranged sequentially in the direction z, with the first light modulation film CF1 being located between the light source 110 and the second light modulation film CF2, but the disclosure is not limited thereto. In other embodiments, the second light modulation film CF2 can be located between the light source 110 and the first light modulation film CF1.

[0099] The first light modulation film CF1 can include a plurality of light blocking structures B1 and a plurality of light transmitting structures C1, which can be arranged alternately in the direction x, and adjacent two light blocking structures B1 can be separated from each other by a light transmitting structure C1. In some embodiments, each light blocking structure B1 can be a columnar structure extending in the direction y, where the direction x intersects the direction y. In some embodiments, the direction x is perpendicular to the direction y. In addition, the second light modulation film CF2 can include a plurality of light blocking structures B2 and a plurality of light transmitting structures C2, which can be arranged alternately in the direction y, and adjacent two light blocking structures B2 can be separated from each other by a light transmitting structure C2. In some embodiments, each light blocking structure B2 can be a columnar structure extending in the direction x. The light blocking structures B1, B2 can have a light transmittance of, for example, less than or equal to 10%, and the light transmitting structures C1, C2 can have a light transmittance of, for example, greater than or equal to 90%.

[0100] Please refer to Figure 1 , the display module 200 of the privacy display device 10 can overlap the backlight module 100. The display module 200 can include a polarizer 210, a polarizer 220, and a display panel 230, where the display panel 230 can be located between the polarizer 210 and the polarizer 220 in the direction z. The polarizer 210 can have a pass axis 210a, and the polarizer 220 can have a pass axis 220a. The pass axis 210a can intersect the pass axis 220a. For example, the polarizer 210 has a pass axis 210a in the direction x, and the polarizer 220 has a pass axis 220a in the direction y. In some embodiments, the pass axis 220a is orthogonal to the pass axis 210a.

[0101] Figure 3This is a schematic cross-sectional view of the display panel 230 of a privacy display device 10 according to an embodiment of the present invention. For example, the display panel 230 includes a lower substrate 231, an upper substrate 232, and a liquid crystal layer 233 sandwiched between the lower substrate 231 and the upper substrate 232. The lower substrate 231 and the upper substrate 232 may be light-transmitting substrates, and their materials include glass, quartz, polymer, or other suitable materials. The liquid crystal molecules LC1 in the liquid crystal layer 233 can modulate the light characteristics by being driven by an electric field. In some embodiments, the thickness d1 of the liquid crystal layer 233 is about 2 μm to 4 μm. In some embodiments, the birefringence coefficient (Δn) of the liquid crystal material in the liquid crystal layer 233 is about 0.09 to 0.15.

[0102] The display panel 230 may further include a driving electrode layer 234. The driving electrode layer 234 may be disposed between the substrate 231 and the liquid crystal layer 233. The driving electrode layer 234 may provide a driving electric field for driving the liquid crystal layer 233, thereby controlling, for example, the light transmittance of the liquid crystal layer 233.

[0103] Figure 4A This is a schematic perspective view of the driving electrode layer 234A of the display panel 230 of the privacy display device 10 according to an embodiment of the present invention. Figure 4A The driving electrode layer 234A shown can replace Figure 3 The driving electrode layer 234 is shown. For example, the driving electrode layer 234A includes electrode A1 and electrode A2. Electrode A1 may have multiple slits A1a, and the multiple slits A1a may overlap electrode A2. In this case, the display panel 230 can be used in in-plane switching (IPS) liquid crystal mode.

[0104] For example, electrode A1 has multiple strip electrodes A11 defining multiple slits A1a, and electrode A2 has multiple strip electrodes A21. The multiple strip electrodes A11 and A21 extend in the y-direction and are alternately arranged in the x-direction, with the slits A1a defined by adjacent strip electrodes A11 overlapping the corresponding strip electrodes A21. In some embodiments, the multiple strip electrodes A11 and A21 may be substantially disposed in the same plane, but are not limited thereto. In some embodiments, the width W1 of strip electrode A11 in the x-direction and the width W2 of strip electrode A21 in the x-direction may be substantially the same, but are not limited thereto. In some embodiments, the multiple strip electrodes A11 and A21 have multiple slits A12a, and the multiple widths W3 of the multiple slits A12a in the x-direction may be substantially the same, but are not limited thereto. In some embodiments, the width W1 is about 2.5 μm to 5 μm. In some embodiments, the width W2 is about 2.5 μm to 5 μm. In some embodiments, the width W3 is approximately 4 μm to 10 μm.

[0105] In some embodiments, the driving electrode layer 234A further includes switching components TA1 and TA2, which are, for example, thin-film transistors. Switching component TA1 is electrically connected to electrode A1 to control whether a voltage is applied to electrode A1 and the magnitude of the voltage applied to electrode A1. For example, when switching component TA1 is off, electrode A1 may have a floating voltage; and when switching component TA1 is on, electrode A1 may have a voltage of 0 volts (V) or higher. Switching component TA2 is electrically connected to electrode A2 to control whether a voltage is applied to electrode A2 and the magnitude of the voltage applied to electrode A2. For example, when switching component TA2 is off, electrode A2 may have a floating voltage; and when switching component TA2 is on, electrode A2 may have a voltage of 0V or higher. In some embodiments, the voltage difference between electrode A1 and electrode A2 is approximately 0V to 15V, for example, 5V or 10V.

[0106] Figure 4B This is a schematic perspective view of the driving electrode layer 234B of the display panel 230 of the privacy display device 10 according to an embodiment of the present invention. Figure 4B The driving electrode layer 234B shown can replace Figure 3 The driving electrode layer 234 is shown. The driving electrode layer 234B may include electrode B1, electrode B2, and an insulating layer B3 located between electrode B1 and electrode B2. For example, electrode B1 has a plurality of strip electrodes B11 defining a plurality of slits B1a. The plurality of strip electrodes B11 extend in the y-direction and are arranged in the x-direction, and adjacent strip electrodes B11 may define a slit B1a. In some embodiments, the plurality of strip electrodes B11 are substantially disposed in the same plane. In some embodiments, the plurality of widths WB1 of the plurality of strip electrodes B11 in the x-direction may be substantially the same, but are not limited thereto. In some embodiments, the width WB1 is about 2.5 μm to 5 μm. In some embodiments, the plurality of widths WBa of the plurality of slits B1a in the x-direction may be substantially the same, but are not limited thereto. In some embodiments, the width WBa is about 4 μm to 10 μm. In some embodiments, electrode B2 is a surface electrode. The insulating layer B3 may be disposed on electrode B2, and the plurality of strip electrodes B11 of electrode B1 may be disposed on the insulating layer B3. In this case, the display panel 230 can be used in Fringe Field Switching (FFS) LCD mode.

[0107] In some embodiments, the driving electrode layer 234B further comprises a switch assembly TB1 and a switch assembly TB2. The switch assembly TB1 is electrically connected to the electrode B1 to control whether to apply a voltage to the electrode B1 and the magnitude of the voltage applied to the electrode B1. For example, when the switch assembly TB1 is closed, the electrode B1 can have a floating voltage; and when the switch assembly TB1 is opened, the electrode B1 can have a voltage of 0V or higher. The switch assembly TB2 is electrically connected to the electrode B2 to control whether to apply a voltage to the electrode B2 and the magnitude of the voltage applied to the electrode B2. For example, when the switch assembly TB2 is closed, the electrode B2 can have a floating voltage; and when the switch assembly TB2 is opened, the electrode B2 can have a voltage of 0V or higher. In some embodiments, the voltage difference between the electrode B1 and the electrode B2 is about 0V to 15V, such as 5V or 10V.

[0108] The electrodes A1, A2, B1, B2 can be light-transmissive electrodes. For example, the material of the electrode A1 and / or the electrode A2 and / or the electrode B1 and / or the electrode B2 can be a metal oxide, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, other suitable oxides, or a stack layer of at least two of the above, but not limited thereto.

[0109] The display panel 230 can further comprise a shared electrode layer 235, which can be disposed between the substrate 232 and the liquid crystal layer 233. In some embodiments, the liquid crystal layer 233 can be driven by the electric field provided by the shared electrode layer 235 and the driving electrode layer 234. In some embodiments, the shared electrode layer 235 is a surface electrode.

[0110] In some embodiments, the display panel 230 further comprises an alignment layer 236 and an alignment layer 237, wherein the alignment layer 236 is located between the driving electrode layer 234 and the liquid crystal layer 233, and the alignment layer 237 is located between the shared electrode layer 235 and the liquid crystal layer 233. The alignment layers 236, 237 can generate an alignment effect on the liquid crystal molecules LC1 in the liquid crystal layer 233, so as to regulate the operation performance of the liquid crystal layer 233. The material of the alignment layers 236, 237 can comprise polyimide or other applicable materials.

[0111] Please refer to Figure 1The viewing angle control module 300 of the privacy display device 10 may include a driving electrode layer 310, a driving electrode layer 320, and a liquid crystal layer 330, wherein the liquid crystal layer 330 may be located between the driving electrode layer 310 and the driving electrode layer 320. The driving electrode layer 310 may be located between the backlight module 100 and the liquid crystal layer 330, while the driving electrode layer 320 may be located between the display module 200 and the liquid crystal layer 330. The viewing angle control module 300 may scatter the collimated light from the backlight module 100 in directions x and -x, y and -y, or x, -x, y and -y, to provide a display effect of sharing left and right viewing angles, sharing top and bottom viewing angles, or sharing both left and right viewing angles and sharing top and bottom viewing angles (i.e., four-way sharing).

[0112] In some embodiments, the viewing angle control module 300 further includes a substrate 340 and a substrate 350, wherein the driving electrode layer 310 may be located between the substrate 340 and the liquid crystal layer 330, and the driving electrode layer 320 may be located between the substrate 350 and the liquid crystal layer 330. The substrates 340 and 350 may be light-transmitting substrates, and their materials may include glass, quartz, polymer, or other suitable materials.

[0113] Figure 5A This is a schematic perspective view of the driving electrode layer 310A of the viewing angle control module 300 of the privacy display device 10 according to an embodiment of the present invention. Figure 5A The driving electrode layer 310A shown can replace Figure 1 The driving electrode layer 310 is shown. For example, the driving electrode layer 310A includes an electrode C1 and an electrode C2. The electrode C1 may have a plurality of slits C1a, and the plurality of slits C1a may overlap the electrode C2. In some embodiments, the electrode C1 has a plurality of strip electrodes C11 defining the plurality of slits C1a, and the electrode C2 has a plurality of strip electrodes C21. The plurality of strip electrodes C11 and the plurality of strip electrodes C21 extend in the x-direction and are alternately arranged in the y-direction, and the slits C1a defined by two adjacent strip electrodes C11 overlap the corresponding strip electrodes C21. In some embodiments, the plurality of strip electrodes C11 and the plurality of strip electrodes C21 may be substantially disposed in the same plane, but this is not a limitation. In some embodiments, the width W4 of the strip electrode C11 in the y-direction and the width W5 of the strip electrode C21 in the y-direction may be substantially the same, but this is not a limitation. In some embodiments, the plurality of strip electrodes C11 and C21 have a plurality of slits C12a extending in the x-direction, and the plurality of slits C12a may have substantially the same width W6 in the y-direction, but are not limited thereto. In some embodiments, the width W4 is about 2.5 μm to 5 μm. In some embodiments, the width W5 is about 2.5 μm to 5 μm. In some embodiments, the width W6 is about 4 μm to 10 μm.

[0114] In some embodiments, the driving electrode layer 310A further includes switching components TC1 and TC2, which are, for example, thin-film transistors. Switching component TC1 is electrically connected to electrode C1 to control whether a voltage is applied to electrode C1 and the magnitude of the voltage applied to electrode C1. For example, when switching component TC1 is off, electrode C1 may have a floating voltage; and when switching component TC1 is on, electrode C1 may have a voltage of 0V or higher. Switching component TC2 is electrically connected to electrode C2 to control whether a voltage is applied to electrode C2 and the magnitude of the voltage applied to electrode C2. For example, when switching component TC2 is off, electrode C2 may have a floating voltage; and when switching component TC2 is on, electrode C2 may have a voltage of 0V or higher. The voltage difference between electrode C1 and electrode C2 can be referred to as the operating voltage of the driving electrode layer 310A. In some embodiments, the operating voltage of the driving electrode layer 310A is approximately 0V to 15V, for example, 5V or 10V.

[0115] Figure 5B This is a schematic perspective view of the driving electrode layer 310B of the viewing angle control module 300 of the privacy display device 10 according to an embodiment of the present invention. Figure 5B The driving electrode layer 310B shown can replace Figure 1 The driving electrode layer 310 is shown. The driving electrode layer 310B may include electrode D1, electrode D2, and an insulating layer D3 located between electrode D1 and electrode D2. For example, electrode D1 has a plurality of strip electrodes D11 defining a plurality of slits D1a. The plurality of strip electrodes D11 extend in the x-direction and are arranged in the y-direction, and adjacent strip electrodes D11 may define a slit D1a. In some embodiments, the plurality of strip electrodes D11 are substantially disposed in the same plane. In some embodiments, the plurality of widths WD1 of the plurality of strip electrodes D11 in the y-direction may be substantially the same, but are not limited thereto. In some embodiments, the width WD1 is about 2.5 μm to 5 μm. In some embodiments, the plurality of widths WDa of the plurality of slits D1a in the y-direction may be substantially the same, but are not limited thereto. In some embodiments, the width WDa is about 4 μm to 10 μm. In some embodiments, electrode D2 is a surface electrode. The insulating layer D3 may be disposed on electrode D2, and the plurality of strip electrodes D11 of electrode D1 may be disposed on the insulating layer D3.

[0116] In some embodiments, the drive electrode layer 310B further includes a switching component TD1 and a switching component TD2. Switching component TD1 is electrically connected to electrode D1 to control whether a voltage is applied to electrode D1 and the magnitude of the voltage applied to electrode D1. For example, when switching component TD1 is off, electrode D1 may have a floating voltage; and when switching component TD1 is on, electrode D1 may have a voltage of 0V or higher. Switching component TD2 is electrically connected to electrode D2 to control whether a voltage is applied to electrode D2 and the magnitude of the voltage applied to electrode D2. For example, when switching component TD2 is off, electrode D2 may have a floating voltage; and when switching component TD2 is on, electrode D2 may have a voltage of 0V or higher. The voltage difference between electrode D1 and electrode D2 can be referred to as the operating voltage of the drive electrode layer 310B. In some embodiments, the operating voltage of the drive electrode layer 310B is approximately 0V to 15V, for example, 5V or 10V.

[0117] Electrodes C1, C2, D1, and D2 can be transparent electrodes. For example, the material of electrode C1 and / or electrode C2 and / or electrode D1 and / or electrode D2 can be a metal oxide, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, other suitable oxides, or a stacked layer of at least two of the above, but is not limited thereto.

[0118] Figure 6A This is a schematic perspective view of another driving electrode layer 320A of the viewing angle control module 300 of the privacy display device 10 according to an embodiment of the present invention. Figure 6A The driving electrode layer 320A shown can replace Figure 3The driving electrode layer 320 is shown. For example, the driving electrode layer 320A includes electrode E1 and electrode E2. Electrode E1 may have a plurality of slits E1a, and the plurality of slits E1a may overlap electrode E2. For example, electrode E1 has a plurality of strip electrodes E11 defining the plurality of slits E1a, and electrode E2 has a plurality of strip electrodes E21. The plurality of strip electrodes E11 and the plurality of strip electrodes E21 extend in the y-direction and are alternately arranged in the x-direction, and the slits E1a defined by adjacent strip electrodes E11 overlap the corresponding strip electrodes E21. In some embodiments, the plurality of strip electrodes E11 and the plurality of strip electrodes E21 may be substantially disposed in the same plane, but are not limited thereto. In some embodiments, the width W7 of strip electrode E11 in the x-direction and the width W8 of strip electrode E21 in the x-direction may be substantially the same, but are not limited thereto. In some embodiments, the plurality of strip electrodes E11 and the plurality of strip electrodes E21 have a plurality of slits E12a, and the plurality of slits E12a may be substantially the same in the x-direction with a plurality of widths W9, but are not limited thereto. In some embodiments, the width W7 is about 2.5 μm to 5 μm. In some embodiments, the width W8 is about 2.5 μm to 5 μm. In some embodiments, the width W9 is about 4 μm to 10 μm.

[0119] In some embodiments, the extending directions of the plurality of strip electrodes E11 and E21 are generally perpendicular to the extending directions of the plurality of strip electrodes C11, C21, and D11. The extending direction of the slit E12a of the driving electrode layer 320A may intersect the extending direction of the slit C12a of the driving electrode layer 310A or the extending direction of the slit D1a of the driving electrode layer 310B. In some embodiments, the extending direction of the slit E12a of the driving electrode layer 320A is perpendicular to the extending direction of the slit C12a of the driving electrode layer 310A or the extending direction of the slit D1a of the driving electrode layer 310B.

[0120] In some embodiments, the driving electrode layer 320A further includes switching components TE1 and TE2, which are, for example, thin-film transistors. Switching component TE1 is electrically connected to electrode E1 to control whether a voltage is applied to electrode E1 and the magnitude of the voltage applied to electrode E1. For example, when switching component TE1 is off, electrode E1 may have a floating voltage; and when switching component TE1 is on, electrode E1 may have a voltage of 0V or higher. Switching component TE2 is electrically connected to electrode E2 to control whether a voltage is applied to electrode E2 and the magnitude of the voltage applied to electrode E2. For example, when switching component TE2 is off, electrode E2 may have a floating voltage; and when switching component TE2 is on, electrode E2 may have a voltage of 0V or higher. The voltage difference between electrode E1 and electrode E2 can be referred to as the operating voltage of the driving electrode layer 320A. In some embodiments, the operating voltage of the driving electrode layer 320A is approximately 0V to 15V, for example, 5V or 10V.

[0121] Figure 6B This is a schematic perspective view of another driving electrode layer 320B of the viewing angle control module 300 of the privacy display device 10 according to an embodiment of the present invention. Figure 6B The driving electrode layer 320B shown can replace Figure 3 The driving electrode layer 320 is shown. The driving electrode layer 320B may include electrode F1, electrode F2, and an insulating layer F3 located between electrode F1 and electrode F2. For example, electrode F1 has a plurality of strip electrodes F11 defining a plurality of slits F1a. The plurality of strip electrodes F11 extend in the y-direction and are arranged in the x-direction, and adjacent strip electrodes F11 may define a slit F1a. In some embodiments, the plurality of strip electrodes F11 are substantially disposed in the same plane. In some embodiments, the plurality of widths WF1 of the plurality of strip electrodes F11 in the x-direction may be substantially the same, but are not limited thereto. In some embodiments, the width WF1 is about 2.5 μm to 5 μm. In some embodiments, the plurality of widths WFa of the plurality of slits F1a in the x-direction may be substantially the same, but are not limited thereto. In some embodiments, the width WFa is about 4 μm to 10 μm. In some embodiments, electrode F2 is a surface electrode. The insulating layer F3 can be disposed on the electrode F2, and the multiple strip electrodes F11 of the electrode F1 can be disposed on the insulating layer F3.

[0122] In some embodiments, the extension directions of the plurality of strip electrodes F11 are generally perpendicular to the extension directions of the plurality of strip electrodes C11, the plurality of strip electrodes C21, and the plurality of strip electrodes D11. The extension direction of the slit F1a of the driving electrode layer 320B may intersect the extension direction of the slit C12a of the driving electrode layer 310A or the extension direction of the slit D1a of the driving electrode layer 310B. In some embodiments, the extension direction of the slit F1a of the driving electrode layer 320B is perpendicular to the extension direction of the slit C12a of the driving electrode layer 310A or the extension direction of the slit D1a of the driving electrode layer 310B.

[0123] In some embodiments, the drive electrode layer 320B further includes switching components TF1 and TF2. Switching component TF1 is electrically connected to electrode F1 to control whether a voltage is applied to electrode F1 and the magnitude of the voltage applied to electrode F1. For example, when switching component TF1 is off, electrode F1 may have a floating voltage; while when switching component TF1 is on, electrode F1 may have a voltage of 0V or higher. Switching component TF2 is electrically connected to electrode F2 to control whether a voltage is applied to electrode F2 and the magnitude of the voltage applied to electrode F2. For example, when switching component TF2 is off, electrode F2 may have a floating voltage; while when switching component TF2 is on, electrode F2 may have a voltage of 0V or higher. The voltage difference between electrode F1 and electrode F2 can be referred to as the operating voltage of the drive electrode layer 320B. In some embodiments, the operating voltage of the drive electrode layer 320B is approximately 0V to 15V, for example, 5V or 10V.

[0124] Electrodes E1, E2, F1, and F2 can be transparent electrodes. For example, the material of electrode E1 and / or electrode E2 and / or electrode F1 and / or electrode F2 can be a metal oxide, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, other suitable oxides, or a stacked layer of at least two of the above, but is not limited thereto.

[0125] Figure 1 The driving electrode layer 310 of the viewing angle control module 300 of the privacy display device 10 shown can be used as follows: Figure 5A The driving electrode layer 310A shown or as Figure 5B The driving electrode layer 310B shown, and the driving electrode layer 320 of the viewing angle control module 300 can be used as follows: Figure 6A The driving electrode layer 320A shown or as Figure 6B The driving electrode layer 320B is shown.

[0126] Figure 7This is a schematic cross-sectional view of the liquid crystal layer 330 of the viewing angle control module 300 of a privacy display device 10 according to an embodiment of the present invention. The liquid crystal layer 330 includes, for example, positive liquid crystal. In some embodiments, the thickness d2 of the liquid crystal layer 330 is about 5 μm to 10 μm. In some embodiments, the thickness difference between the liquid crystal layer 330 of the viewing angle control module 300 and the liquid crystal layer 233 in the display module 200 (i.e., thickness d2 minus thickness d1) is about 1 μm to 8 μm, for example, 3 μm or 5 μm. The birefringence of the liquid crystal material in the liquid crystal layer 330 can be greater than the birefringence of the liquid crystal material in the liquid crystal layer 233. In some embodiments, the birefringence of the liquid crystal material in the liquid crystal layer 330 is about 0.17 to 0.27.

[0127] The viewing angle control module 300 may further include an alignment layer 360 and an alignment layer 370, with the liquid crystal layer 330 sandwiched between the alignment layers 360 and 370. In some embodiments, the alignment layer 360 is located between the driving electrode layer 310 and the liquid crystal layer 330, and the alignment layer 370 is located between the driving electrode layer 320 and the liquid crystal layer 330. The alignment layers 360 and 370 can align the liquid crystal molecules LC2 in the liquid crystal layer 330, thereby controlling the operational performance of the liquid crystal layer 330. The materials of the alignment layers 360 and 370 may include polyimide or other suitable materials.

[0128] Please refer to Figure 1 In some embodiments, alignment layer 360 has a horizontal alignment and alignment layer 370 has a vertical alignment, but this is not a limitation. In some embodiments, alignment layer 360 has a horizontal alignment and alignment layer 370 has a paper-plane horizontal alignment. In other embodiments, alignment layers 360 and 370 may both have a horizontal alignment. When the operating voltage of driving electrode layer 310 and driving electrode layer 320 is 0V, in the direction from driving electrode layer 310 to driving electrode layer 320, the tilt direction (or long axis direction) of liquid crystal molecules LC2 in liquid crystal layer 330 can gradually twist from the horizontal direction (φ=0˚, θ=90˚) to the vertical direction (θ=0˚). In this way, the collimated light from backlight module 100 is not affected by viewing angle control module 300 and enters display module 200 in a collimated manner. Therefore, privacy display device 10 can provide a four-way privacy display mode.

[0129] Figure 8A This is a schematic perspective view of a privacy display device 10 according to an embodiment of the present invention, in a display mode where the left and right viewing angles are shared and the top and bottom viewing angles are privacy-protected. Please refer to... Figure 8AIn some embodiments, when the operating voltage of the driving electrode layer 310 is 0V and the operating voltage of the driving electrode layer 320 is greater than 0V, the driving electrode layer 320 generates a horizontal electric field EF1 in the direction x (i.e., the left-right horizontal direction, or the left-right viewing direction) and a downward vertical electric field EF2. The horizontal electric field EF1 causes the tilt direction of the liquid crystal molecules LC2 near the driving electrode layer 320 in the liquid crystal layer 330 to change periodically along the direction x. As a result, the refractive index of the liquid crystal molecules LC2 changes with the tilt angle, thereby scattering the polarized light in the direction x to the left viewing direction DL and the right viewing direction DR. It can enter the display module 200 through the penetration axis 210a of the polarizer 210. Therefore, the privacy display device 10 can provide a display mode that shares the left and right viewing angles and provides privacy protection for the top and bottom viewing angles.

[0130] In some embodiments, no voltage is applied to the driving electrode layer 310, i.e., the driving electrode layer 310 may have a floating voltage, and the non-zero operating voltage of the driving electrode layer 320 may cause the driving electrode layer 310 to generate induced charge in order to avoid generating a vertical electric field EF2.

[0131] Figure 8B This is a schematic perspective view of a privacy display device 10 according to an embodiment of the present invention, in a display mode where the left and right viewing angles are privacy-protected and the vertical viewing angles are shared. Please refer to... Figure 8B In some embodiments, when the operating voltage of the driving electrode layer 310 is greater than 0V and the operating voltage of the driving electrode layer 320 is 0V, the driving electrode layer 310 generates a horizontal electric field EF3 in the direction y (i.e., the horizontal direction of the paper entry surface, or the vertical viewing angle direction) and generates an upward vertical electric field EF4. The horizontal electric field EF3 causes the tilt direction of the liquid crystal molecules LC2 near the driving electrode layer 310 in the liquid crystal layer 330 to change periodically along the direction y. As a result, the refractive index of the liquid crystal molecules LC2 changes with the tilt angle, thereby scattering the polarized light in the direction y to the upper viewing angle DT and the lower viewing angle DB. It can then be twisted by the phase retardation of the liquid crystal layer 330 to be scattered to the left viewing angle DL and the right viewing angle DR. Therefore, it can enter the display module 200 through the penetration axis 210a of the polarizer 210. In this way, the privacy display device 10 can provide a display mode with shared vertical viewing angle and privacy protection for the left and right viewing angles.

[0132] In some embodiments, no voltage is applied to the driving electrode layer 320, i.e., the driving electrode layer 320 may have a floating voltage, and the non-zero operating voltage of the driving electrode layer 310 may cause the driving electrode layer 320 to generate induced charges, thereby avoiding the generation of a vertical electric field EF4. In some embodiments, the degree of twisting of the liquid crystal molecules LC2 in the liquid crystal layer 330 is related to the electric field strength generated by the driving electrode layer 310. The stronger the electric field, the more liquid crystal molecules will deflect from the horizontal direction (e.g., direction y) of the paper entry surface to the left and right horizontal direction (e.g., direction x). Therefore, the twisted area will change, and the number of twisted liquid crystal molecules will differ, but the direction will still be approximately the same.

[0133] Figure 8C This is a schematic perspective view of a privacy display device 10 in a four-way sharing display mode according to an embodiment of the present invention. Please refer to... Figure 8C In some embodiments, when the operating voltage of the driving electrode layer 310 is greater than 0V and the operating voltage of the driving electrode layer 320 is greater than 0V, the driving electrode layer 310 generates a horizontal electric field EF5 in the direction y, the driving electrode layer 320 generates a horizontal electric field EF6 in the direction x, and generates a vertical electric field EF7. In some embodiments, the direction of the vertical electric field EF7 is downward.

[0134] For example, the horizontal electric field EF5 causes the tilt direction of the liquid crystal molecules LC2 near the driving electrode layer 310 in the liquid crystal layer 330 to change periodically along the y-direction, thereby scattering polarized light in the y-direction to the upper viewing angle direction DT and the lower viewing angle direction DB. This light can then be twisted by the phase retardation of the liquid crystal layer 330 and scattered to the left viewing angle direction DL1 and the right viewing angle direction DR1, and enter the display module 200 through the transmission axis 210a of the polarizer 210. Similarly, the horizontal electric field EF6 causes the tilt direction of the liquid crystal molecules LC2 near the driving electrode layer 320 in the liquid crystal layer 330 to change periodically along the x-direction, thereby scattering polarized light in the x-direction to the left viewing angle direction DL2 and the right viewing angle direction DR2, and entering the display module 200 through the transmission axis 210a of the polarizer 210. In other words, when both driving electrode layers 310 and 320 have non-zero operating voltages, since the arrangement directions of the strip electrodes of driving electrode layers 310 and 320 are approximately perpendicular to each other, the tilt direction of the liquid crystal molecules LC2 near driving electrode layer 310 is also approximately perpendicular to the tilt direction of the liquid crystal molecules LC2 near driving electrode layer 320. Furthermore, because liquid crystal layer 330 is a continuous layer, the phase delay twisting of the liquid crystal molecules LC2 in the middle portion of liquid crystal layer 330 achieves the effect of scattering light to the left and right viewing angles and the top and bottom viewing angles. Therefore, the privacy display device 10 can provide a four-way sharing display mode. In some embodiments, the greater the operating voltage of driving electrode layers 310 and 320, the greater the amount of light scattered, thereby further improving the brightness of the sharing viewing angles.

[0135] The following uses Figures 9A to 11C Further embodiments of the present invention will be described, and the following will be used... Figures 1 to 8C The component reference numerals and related content of the embodiments are described below, wherein the same or similar reference numerals are used to represent the same or similar components, and descriptions of the same technical content are omitted. For explanations of the omitted parts, please refer to... Figures 1 to 8C The embodiments are not described in detail below.

[0136] The twisting of liquid crystal molecules LC2 in liquid crystal layer 330 can also be achieved by the triboelectric alignment of alignment layers 360 and 370. For example, the surfaces of alignment layers 360 and 370 can be formed with grooves by rubbing. These grooves can extend along the rubbing direction to guide the liquid crystal molecules LC2 in liquid crystal layer 330 to tilt and align along the rubbing direction. In other words, alignment layers 360 and 370 can also align the liquid crystal molecules LC2 in liquid crystal layer 330 by triboelectric alignment. Alignment layers 360 and 370 can have various triboelectric alignments, and the triboelectric alignments of alignment layers 360 and 370 can be the same or different.

[0137] Figure 9A This is a schematic perspective view of the viewing angle control module 300 of a privacy display device 20 according to an embodiment of the present invention in a four-way privacy display mode. Please refer to... Figure 9A The privacy display device 20 may include, for example, Figure 1 The backlight module 100, display module 200, and viewing angle control module 300 shown are included, and the viewing angle control module 300 of the privacy display device 20 may include, for example, Figure 1 The driving electrode layers 310, 320, liquid crystal layer 330, and substrates 340, 350 shown, as well as... Figure 7 The alignment layers 360 and 370 are shown. (The text abruptly ends here, seemingly mid-sentence.) Figure 1 and Figure 7 Compared to the structure of the viewing angle control module 300 of the privacy display device 10 shown, Figure 9AThe main difference in the structure of the viewing angle control module 300 of the privacy display device 20 is that the alignment layer 360 of the viewing angle control module 300 can have a frictional alignment that is generally horizontal in the paper-implementation direction (φ=90˚, θ=89˚), and the alignment layer 370 can have a frictional alignment that is generally horizontal in the left-right direction (φ=0˚, θ=89˚). In this way, when the operating voltage of the driving electrode layer 310 and the driving electrode layer 320 is 0V, the tilt direction (or long axis direction) of the liquid crystal molecules LC2 in the liquid crystal layer 330 can gradually change from a direction approximately horizontal in the paper-implementation direction (φ=90˚, θ=89˚) to a direction approximately horizontal in the left-right direction (φ=0˚, θ=89˚) in the direction from the driving electrode layer 310 to the driving electrode layer 320.

[0138] Figure 9B This is a schematic perspective view of the viewing angle control module 300 of the privacy display device 20 according to an embodiment of the present invention, in a display mode where the left and right viewing angles are shared and the top and bottom viewing angles are privacy-protected. Please refer to... Figure 9B When the operating voltage of the driving electrode layer 310 is 0V and the operating voltage of the driving electrode layer 320 is greater than 0V, the driving electrode layer 320 generates a horizontal electric field in the direction x (left-right direction), thereby guiding the tilt direction of the liquid crystal molecules LC2 near the driving electrode layer 320 in the liquid crystal layer 330 from the approximately horizontal direction (φ=0˚, θ=89˚) to a periodic change along the direction x, so that the polarized light in the direction x is scattered to the left and right viewing angles. Therefore, the privacy display device 20 can provide a display mode that shares the left and right viewing angles and protects the top and bottom viewing angles.

[0139] Figure 9C This is a schematic perspective view of the viewing angle control module 300 of the privacy display device 20 according to an embodiment of the present invention, in a display mode where the left and right viewing angles are privacy-protected and the vertical viewing angles are shared. Please refer to... Figure 9C When the operating voltage of the driving electrode layer 310 is greater than 0V and the operating voltage of the driving electrode layer 320 is 0V, the driving electrode layer 310 generates a horizontal electric field in the direction y (horizontal direction of the paper entry plane), thereby guiding the tilt direction of the liquid crystal molecules LC2 in the liquid crystal layer 330 near the driving electrode layer 310 from the direction approximately horizontal of the paper entry plane (φ=90˚, θ=89˚) to a periodic change along the direction y, so that the polarized light in the direction y is scattered to the vertical viewing angle direction. Therefore, the privacy display device 20 can provide a display mode that shares the vertical viewing angle and protects the horizontal viewing angle.

[0140] Figure 10A This is a schematic perspective view of the viewing angle control module 300 of a privacy display device 30 according to an embodiment of the present invention in a four-way privacy display mode. Please refer to... Figure 10A The privacy display device 30 may include, for example, Figure 1The backlight module 100, display module 200, and viewing angle control module 300 shown are included, and the viewing angle control module 300 of the privacy display device 30 may include, for example, Figure 1 The driving electrode layers 310, 320, liquid crystal layer 330, and substrates 340, 350 shown, as well as... Figure 7 The alignment layers 360 and 370 are shown. (The text abruptly ends here, seemingly mid-sentence.) Figure 1 and Figure 7 Compared to the structure of the viewing angle control module 300 of the privacy display device 10 shown, Figure 10A The main difference in the structure of the viewing angle control module 300 of the privacy display device 30 is that the alignment layer 360 of the viewing angle control module 300 can have a frictional alignment that is generally horizontal in the direction of the paper entry plane (φ=90˚, θ=89˚), and the alignment layer 370 can have a frictional alignment that is generally perpendicular and in the xz plane (φ=0˚, θ=1˚). In this way, when the operating voltage of the driving electrode layer 310 and the driving electrode layer 320 is 0V, the tilt direction (or long axis direction) of the liquid crystal molecules LC2 in the liquid crystal layer 330 can gradually change from a direction approximately horizontal in the direction of the paper entry plane (φ=90˚, θ=89˚) to a direction approximately perpendicular in the xz plane (φ=0˚, θ=1˚) in the direction from the driving electrode layer 310 to the driving electrode layer 320.

[0141] Figure 10B This is a schematic perspective view of the viewing angle control module 300 of the privacy display device 30 according to an embodiment of the present invention, in a display mode where the left and right viewing angles are shared and the top and bottom viewing angles are privacy-protected. Please refer to... Figure 10B When the operating voltage of the driving electrode layer 310 is 0V and the operating voltage of the driving electrode layer 320 is greater than 0V, the driving electrode layer 320 generates a horizontal electric field in the x direction (left-right direction), thereby guiding the tilt direction of the liquid crystal molecules LC2 near the driving electrode layer 320 in the liquid crystal layer 330 from the approximately vertical direction on the xz plane (φ=0˚, θ=1˚) to a periodic change along the x direction, so that the polarized light in the x direction is scattered to the left and right viewing angles. Therefore, the privacy display device 30 can provide a display mode that shares the left and right viewing angles and protects the top and bottom viewing angles.

[0142] Figure 10C This is a schematic perspective view of the viewing angle control module 300 of the privacy display device 30 according to an embodiment of the present invention, in a display mode where the left and right viewing angles are privacy-protected and the vertical viewing angles are shared. Please refer to... Figure 10CWhen the operating voltage of the driving electrode layer 310 is greater than 0V and the operating voltage of the driving electrode layer 320 is 0V, the driving electrode layer 310 generates a horizontal electric field in the direction y (horizontal direction of the paper entry plane), thereby guiding the tilt direction of the liquid crystal molecules LC2 in the liquid crystal layer 330 near the driving electrode layer 310 from the direction approximately horizontal of the paper entry plane (φ=90˚, θ=89˚) to a periodic change along the direction y, so that the polarized light in the direction y is scattered to the vertical viewing angle direction. Therefore, the privacy display device 30 can provide a display mode that shares the vertical viewing angle and provides privacy protection for the horizontal viewing angle.

[0143] Figure 11A This is a schematic perspective view of the viewing angle control module 300 of a privacy display device 40 according to an embodiment of the present invention in a four-way privacy display mode. Please refer to... Figure 11A The privacy display device 40 may include, for example, Figure 1 The backlight module 100, display module 200, and viewing angle control module 300 shown are included, and the viewing angle control module 300 of the privacy display device 40 may include, for example, Figure 1 The driving electrode layers 310, 320, liquid crystal layer 330, and substrates 340, 350 shown, as well as... Figure 7 The alignment layers 360 and 370 are shown. (The text abruptly ends here, seemingly mid-sentence.) Figure 1 and Figure 7 Compared to the structure of the viewing angle control module 300 of the privacy display device 10 shown, Figure 11A The main difference in the structure of the viewing angle control module 300 of the privacy display device 40 is that the alignment layer 360 of the viewing angle control module 300 of the privacy display device 40 can have a generally perpendicular (φ=90˚, θ=1˚) triboelectric alignment on the yz plane, and the alignment layer 370 can have a generally perpendicular (φ=0˚, θ=1˚) triboelectric alignment on the xz plane. In this way, when the operating voltage of the driving electrode layer 310 and the driving electrode layer 320 is 0V, the tilt direction (or long axis direction) of the liquid crystal molecules LC2 in the liquid crystal layer 330 can gradually change from a direction approximately perpendicular to the yz plane (φ=90˚, θ=1˚) to a direction approximately perpendicular to the xz plane (φ=0˚, θ=1˚) in the direction from the driving electrode layer 310 to the driving electrode layer 320.

[0144] Figure 11B This is a schematic perspective view of the viewing angle control module 300 of the privacy display device 40 according to an embodiment of the present invention, in a display mode where the left and right viewing angles are shared and the top and bottom viewing angles are privacy-protected. Please refer to... Figure 11BWhen the operating voltage of the driving electrode layer 310 is 0V and the operating voltage of the driving electrode layer 320 is greater than 0V, the driving electrode layer 320 generates a horizontal electric field in the direction x (left and right horizontal direction), thereby guiding the tilt direction of the liquid crystal molecules LC2 near the driving electrode layer 320 in the liquid crystal layer 330 from the approximately vertical direction on the xz plane (φ=0˚, θ=1˚) to a periodic change along the direction x, so that the polarized light in the direction x is scattered to the left and right viewing angles. Therefore, the privacy display device 40 can provide a display mode that shares the left and right viewing angles and protects the top and bottom viewing angles.

[0145] Figure 11C This is a schematic perspective view of the viewing angle control module 300 of the privacy display device 40 according to an embodiment of the present invention, in a display mode where the left and right viewing angles are privacy-protected and the vertical viewing angles are shared. Please refer to... Figure 11C When the operating voltage of the driving electrode layer 310 is greater than 0V and the operating voltage of the driving electrode layer 320 is 0V, the driving electrode layer 310 generates a horizontal electric field in the direction y (horizontal direction of the paper plane), thereby guiding the tilt direction of the liquid crystal molecules LC2 near the driving electrode layer 310 in the liquid crystal layer 330 from the approximately vertical direction on the yz plane (φ=90˚, θ=1˚) to a periodic change along the direction y, so that the polarized light in the direction y is scattered to the vertical viewing angle direction. Therefore, the privacy display device 40 can provide a display mode that shares the vertical viewing angle and protects the left and right viewing angles.

[0146] In summary, the privacy display device of the present invention, by providing a driving electrode layer including a plurality of strip electrodes extending in the x-direction and a driving electrode layer including a plurality of strip electrodes extending in the y-direction on the upper and lower sides of the liquid crystal layer of the viewing angle control module, can scatter light to the upper and lower viewing angles and / or the left and right viewing angles as needed, thereby providing privacy and sharing modes independently in the upper and lower viewing angles and the left and right viewing angles.

Claims

1. A privacy display device, characterized by, The application relates to a backlight module, a display module and a viewing angle control module. The backlight module emits collimated light, wherein the collimated light has a light intensity ratio of 0.001% to 0.4% between a 45° viewing angle direction and a normal viewing angle direction of a light emitting surface of the backlight module. The display module overlaps the backlight module. The viewing angle control module is located between the backlight module and the display module and comprises: a first driving electrode layer located between the backlight module and the display module and having a plurality of first slits; a second driving electrode layer located between the first driving electrode layer and the display module and having a plurality of second slits, wherein the extension directions of the plurality of second slits intersect the extension directions of the plurality of first slits; and a first liquid crystal layer located between the first driving electrode layer and the second driving electrode layer. The backlight module comprises a light source and a light adjusting assembly located between the light source and the viewing angle control module.

2. The privacy display device of claim 1, wherein, The light adjusting assembly comprises a grid-shaped light blocking structure.

3. The privacy display device of claim 2, wherein, The light adjusting assembly comprises a first light adjusting sheet and a second light adjusting sheet overlapping the first light adjusting sheet, the first light adjusting sheet comprises a plurality of first light blocking structures and a plurality of first light transmitting structures arranged alternately, the second light adjusting sheet comprises a plurality of second light blocking structures and a plurality of second light transmitting structures arranged alternately, and the extension directions of the first light blocking structures intersect the extension directions of the second light blocking structures.

4. The privacy display device of claim 2, wherein, The extension directions of the plurality of first slits are perpendicular to the extension directions of the plurality of second slits.

5. The privacy display device of claim 1, wherein, The first driving electrode layer comprises a plurality of first strip-shaped electrodes defining the plurality of first slits, the plurality of first strip-shaped electrodes extend in a first direction and are arranged in a second direction perpendicular to the first direction.

6. The privacy display device of claim 1, wherein, The second driving electrode layer comprises a plurality of second strip-shaped electrodes defining the plurality of second slits, the plurality of second strip-shaped electrodes extend in the second direction and are arranged in the first direction.

7. The privacy display device of claim 6, wherein, The first driving electrode layer and the second driving electrode layer are respectively connected to a corresponding switching assembly.

8. The privacy display device of claim 1, wherein, The display module comprises a first polarizing sheet, a second polarizing sheet and a second liquid crystal layer located between the first polarizing sheet and the second polarizing sheet, the first polarizing sheet is located between the viewing angle control module and the second liquid crystal layer, and the transmission axis direction of the first polarizing sheet is the same as the extension direction of the plurality of first slits.

9. The privacy display device of claim 1, wherein, The thickness difference between the first liquid crystal layer and the second liquid crystal layer is 1-8 microns.

10. The privacy display device of claim 9, wherein, The birefringence coefficient of the first liquid crystal layer is 0.09-0.15, and the birefringence coefficient of the second liquid crystal layer is 0.17-0.

27.

11. The privacy display device of claim 9, wherein, The viewing angle control module further comprises a first alignment layer located between the first liquid crystal layer and the first driving electrode layer and a second alignment layer located between the first liquid crystal layer and the second driving electrode layer.

12. The privacy display device of claim 1, wherein, The first alignment layer is horizontally aligned left and right, and the second alignment layer has vertical alignment, horizontal alignment in the paper plane or horizontal alignment left and right.

13. The privacy display device of claim 12, wherein, The first alignment layer has rubbing alignment of phi=90° and theta=89°, and the second alignment layer has rubbing alignment of phi=0° and theta=89° or phi=0° and theta=1°.

14. The privacy display device of claim 12, wherein, ​ 15. The privacy display device of claim 12, wherein, The second alignment layer has a rubbing alignment of φ = 0° and θ = 1°, and the first alignment layer has a rubbing alignment of φ = 90° and θ = 1° or φ = 90° and θ = 89°. 16.An operating method of a privacy display apparatus, the method comprising: Comprise: applying 0V voltage to the first driving electrode layer and the second driving electrode layer of the privacy display device as claimed in claim 1, so that the privacy display device provides a four-way privacy mode; applying a first operating voltage to the first driving electrode layer, and applying 0V voltage to the second driving electrode layer or not applying voltage to the second driving electrode layer, so that the privacy display device provides a privacy mode in the extension direction of the plurality of first slits, and provides a sharing mode in the extension direction of the plurality of second slits; applying 0V voltage to the first driving electrode layer or not applying voltage to the first driving electrode layer, and applying a second operating voltage to the second driving electrode layer, so that the privacy display device provides a sharing mode in the extension direction of the plurality of first slits, and provides a privacy mode in the extension direction of the plurality of second slits; or applying the first operating voltage to the first driving electrode layer and the second operating voltage to the second driving electrode layer, so that the privacy display device provides a four-way sharing mode.

17. The operating method of the privacy display apparatus of claim 16, wherein, The first operating voltage and the second operating voltage are greater than 0V and less than or equal to 15V.

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