Visual angle control device

Abstract

The invention provides a visual angle control device. The visual angle control device comprises a first substrate; the second substrate is arranged opposite to the first substrate; the visual angle control medium is arranged between the first substrate and the second substrate; the first alignment layer is arranged between the first substrate and the visual angle control medium and has first anchoring strength; the second alignment layer is arranged between the second substrate and the visual angle control medium and has second anchoring strength; a first polaroid; and the compensation layer is arranged between the first polaroid and the visual angle control medium. The first substrate is arranged between the first polaroid and the first alignment layer. The first anchoring strength is smaller than the second anchoring strength.

Description

Technical Field

[0001] The invention relates to a viewing angle control device, in particular to a viewing angle control device capable of providing a privacy function. Background Art

[0002] Privacy devices (e.g., anti-peeping devices) can be applied to various types of electronic devices, such as display devices. However, in display devices including traditional privacy devices, the effect of the privacy device on the brightness of the display device in normal display mode may not be sufficient, or the privacy device of the display device may not perform well in the privacy mode. Therefore, how to improve the performance of privacy devices remains an important issue in the art. Summary of the invention

[0003] The object of the present invention is to provide a viewing angle control device.

[0004] The present invention provides a viewing angle control device, which includes a first substrate; a second substrate, arranged relative to the first substrate; a viewing angle control medium, arranged between the first substrate and the second substrate; a first alignment layer, arranged between the first substrate and the viewing angle control medium and having a first anchoring strength; a second alignment layer, arranged between the second substrate and the viewing angle control medium and having a second anchoring strength; a first polarizer; and a compensation layer, arranged between the first polarizer and the viewing angle control medium. The first substrate is arranged between the first polarizer and the first alignment layer. The first anchoring strength is less than the second anchoring strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 FIG. 1 is a cross-sectional diagram of an electronic device according to a first embodiment of the present invention.

[0006] Figure 2 It is a brightness profile diagram of the electronic device in the sharing mode and the privacy mode according to the first embodiment of the present invention.

[0007] Figure 3 FIG. 4 is a cross-sectional diagram of an electronic device according to a second embodiment of the present invention.

[0008] Figure 4 FIG. 4 is a cross-sectional diagram of an electronic device according to a third embodiment of the present invention.

[0009] Figure 5 Schematic diagrams of several examples of electronic devices according to the third embodiment of the present invention.

[0010] Figure 6 FIG. 4 is a cross-sectional diagram of an electronic device according to a fourth embodiment of the present invention.

[0011] Figure 7 FIG. 5 is a cross-sectional diagram of an electronic device according to a fifth embodiment of the present invention.

[0012] Figure 8 FIG. 5 is a schematic diagram of an electronic device in several modes according to a fifth embodiment of the present invention.

[0013] Fig. 9 FIG. 4 is a schematic diagram of several electronic devices including the viewing angle control device of the present invention.

[0014] Explanation of reference numerals: 100, 200, 300, 400, 500, VD-viewing angle control device; A1-positive A plate; AL1-first alignment layer; AL2-second alignment layer; B1-biaxial film; BL-backlight module; C1-negative C plate; CM1, CM2-compensation layer; D1-thickness; ED-electronic device; EL1, EL1'-first electrode; EL11-first sub-electrode; EL12-second sub-electrode; EL2, EL2'-second electrode; EMD-self-luminous display device; GP-gap; LCM, LCM1, LCM2-liquid crystal molecules; LD-liquid crystal display panel; ne-extraordinary refractive index; no-ordinary refractive index; PL1-first polarizer; PL2-second polarizer; R1-first region; R2-second region; RD-reflective display device; RD2, RD1, RD3-rubbing direction; S1, S2-surface; SB1-first substrate; SB2-second substrate; V1, V2, V3, V4, V6, V5-voltage difference; VM-viewing angle control medium; X, Y, Z-direction. DETAILED DESCRIPTION

[0015] The present invention can be understood by referring to the following detailed description in conjunction with the accompanying drawings. It should be noted that in order to make it easier for readers to understand and for the simplicity of the drawings, the multiple drawings in the present invention only depict a portion of the device, and specific elements in the drawings are not drawn according to the actual scale. In addition, the number and size of each element in the figure are only for illustration and are not intended to limit the scope of the present invention.

[0016] Certain words are used throughout the specification and the appended claims to refer to specific components. It should be understood by those skilled in the art that electronic equipment manufacturers may refer to the same components by different names. The present invention is not intended to distinguish between components that have the same function but different names.

[0017] In the present specification and claims, the words “including” and “comprising” are open-ended words and should therefore be interpreted as meaning “including but not limited to…”.

[0018] It should be understood that when an element or a film layer is referred to as being "disposed on" or "connected to" another element or film layer, it may be directly on or directly connected to this other element or film layer, or there may be an intervening element or film layer between the two (indirect case). Conversely, when an element is referred to as being "directly on" or "directly connected to" another element or film layer, there may be no intervening element or film layer between the two. When an element or a film layer is referred to as being "electrically connected" to another element or film layer, it may be interpreted as a direct electrical connection or an indirect electrical connection. The electrical connection or coupling described in the present invention may refer to a direct connection or an indirect connection. In the case of a direct connection, the endpoints of the components on the two circuits are directly connected or connected to each other by a conductor segment, and in the case of an indirect connection, there is a switch, a diode, a capacitor, an inductor, a resistor, other suitable components, or a combination of the above components between the endpoints of the components on the two circuits, but is not limited thereto.

[0019] Although the terms "first", "second", "third" ... can be used to describe a variety of components, the components are not limited to these terms. These terms are only used to distinguish a single component from other components in the specification. The same terms may not be used in the claims, but may be replaced by first, second, third ... according to the order of the components declared in the claims. Therefore, in the following description, the first component may be the second component in the claims.

[0020] In the present invention, the thickness, length and width may be measured by an optical microscope, and the thickness or width may be measured by a cross-sectional image in an electron microscope, but the present invention is not limited thereto.

[0021] In addition, any two values ​​or directions used for comparison may have a certain error. The terms "approximately", "equal to", "equal to" or "same", "substantially" or "substantially" are generally interpreted as being within a range of plus or minus 20% of the given value, or within a range of plus or minus 10%, plus or minus 5%, plus or minus 3%, plus or minus 2%, plus or minus 1% or plus or minus 0.5% of the given value.

[0022] In addition, the phrases “a given range is from a first value to a second value” and “a given range falls within the range from a first value to a second value” mean that the given range includes the first value, the second value and other values ​​therebetween.

[0023] If the first direction is perpendicular to the second direction, the angle between the first direction and the second direction may be between 80 degrees and 100 degrees; if the first direction is parallel to the second direction, the angle between the first direction and the second direction may be between 0 degrees and 10 degrees.

[0024] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the background or context of the relevant technology and the present invention, and should not be interpreted in an idealized or overly formal manner unless specifically defined in the embodiments of the present invention.

[0025] It should be noted that the following embodiments may be implemented by replacing, reorganizing, or mixing the technical features in several different embodiments without departing from the spirit of the present invention to complete other embodiments.

[0026] The electronic device of the present invention may include a viewing angle control device, and the viewing angle control device may be applied to other electronic devices. The electronic device may include a display device, a sensing device, a backlight device, an antenna device, a splicing device or other suitable electronic devices, but is not limited thereto. The electronic device may be a bendable electronic device, a flexible electronic device or a stretchable electronic device. The display device may, for example, include a laptop computer, a public display, a splicing display, a car display, a touch display, a television, a monitor, a smart phone, a tablet computer, a light source module, a lighting device or, for example, an electronic device applied to the above products, but is not limited thereto. The sensing device may, for example, include a biosensor, a touch sensor, a fingerprint sensor, other suitable sensors or a combination of the above sensors. The antenna device may include a liquid crystal antenna device or a non-liquid crystal antenna device, but is not limited thereto. The splicing device may, for example, include a display splicing device or an antenna splicing device, but is not limited thereto. It should be noted that the electronic device may be various combinations of the above devices, but is not limited thereto. The appearance of the viewing angle control device may be rectangular, circular, polygonal, a shape with curved edges or other suitable shapes, depending on the design requirements.

[0027] Please refer to Figure 1 and Figure 2 , Figure 1 is a cross-sectional schematic diagram of an electronic device according to a first embodiment of the present invention, Figure 2 1 is a brightness profile diagram of the electronic device in the sharing mode and the privacy mode according to the first embodiment of the present invention. The electronic device ED of the present invention may include a viewing angle control device 100, wherein the viewing angle control device 100 may be applied to any suitable electronic device. Figure 1As shown, the viewing angle control device 100 includes a first substrate SB1, a second substrate SB2 arranged relative to the first substrate SB1, a viewing angle control medium VM arranged between the first substrate SB1 and the second substrate SB2, a first alignment layer AL1 arranged between the first substrate SB1 and the viewing angle control medium VM, a second alignment layer AL2 arranged between the second substrate SB2 and the viewing angle control medium VM, a first polarizer PL1 and a second polarizer PL2. The first substrate SB1 is arranged between the first polarizer PL1 and the first alignment layer AL1. The second substrate SB2 is arranged between the second polarizer PL2 and the second alignment layer AL2. The features of the above elements and film layers will be described in detail below.

[0028] The first substrate SB1 and the second substrate SB2 may include any suitable transparent material. In this way, light can pass through the first substrate SB1 and the second substrate SB2 without being blocked or absorbed by the substrates. The first substrate SB1 and the second substrate SB2 may include a hard substrate or a flexible substrate, respectively. The hard substrate may include glass, quartz, sapphire, ceramic, other suitable materials, or a combination of the above materials. The flexible substrate may include polyimide (PI), polycarbonate (PC), polyethylene terephthalate (PET), other suitable materials, or a combination of the above materials. Although Figure 1 The first substrate SB1 and the second substrate SB2 include a single-layer structure, but the present invention is not limited thereto. In some embodiments, the first substrate SB1 and the second substrate SB2 may include a multi-layer structure, respectively.

[0029] In the present embodiment, the viewing angle control medium VM may be disposed between the first alignment layer AL1 and the second alignment layer AL2. Specifically, the viewing angle control medium VM may be sandwiched between the first alignment layer AL1 and the second alignment layer AL2. The viewing angle control medium VM may include any suitable material capable of controlling the viewing angle of the electronic device to which the viewing angle control device 100 is applied. Specifically, the viewing angle control medium VM may include any suitable light modulating material. According to the present embodiment, the viewing angle control medium VM may include a liquid crystal layer, wherein the liquid crystal layer includes a plurality of liquid crystal molecules LCM. In the present embodiment, the liquid crystal molecules LCM may be positive liquid crystal molecules, but are not limited thereto.

[0030] The viewing angle control medium VM (ie, the liquid crystal layer) has a phase retardation RE, wherein the phase retardation RE can be obtained by the following formula (1):

[0031] RE=Δn*D1 (1)

[0032] Wherein, Δn can be obtained by subtracting the ordinary refractive index no from the extraordinary refractive index ne of the liquid crystal molecule LCM (ie, Δn=ne-no), and D1 is the thickness D1 of the viewing angle control medium VM (ie, Figure 1 ). According to this embodiment, the phase delay RE of the viewing angle control medium VM may be greater than or equal to 1000 nanometers (nanometer, nm). In some embodiments, the phase delay RE of the viewing angle control medium VM may be greater than or equal to 1100 nm. In some embodiments, the phase delay RE of the viewing angle control medium VM may be greater than or equal to 1200 nm. By making the phase delay of the viewing angle control medium VM within the above range, the privacy effect provided by the viewing angle control device 100 can be improved (to be described in detail below).

[0033] The first alignment layer AL1 and the second alignment layer AL2 may be disposed adjacent to the viewing angle control medium VM, and may align the liquid crystal molecules LCM along a specific direction. According to the present embodiment, the first alignment layer AL1 has a first anchoring strength, and the second alignment layer AL2 has a second anchoring strength, wherein the first anchoring strength is different from the second anchoring strength. Specifically, the first anchoring strength of the first alignment layer AL1 is less than the second anchoring strength of the second alignment layer AL2. The anchoring strength of an alignment layer may represent the intermolecular forces between the molecules on the surface of the alignment layer and the liquid crystal molecules LCM. That is, the above-mentioned "the first anchoring strength is less than the second anchoring strength" may represent that the intermolecular forces between the molecules on the surface S1 of the first alignment layer AL1 and the liquid crystal molecules LCM are less than the intermolecular forces between the molecules on the surface S2 of the second alignment layer AL2 and the liquid crystal molecules LCM.

[0034] In this embodiment, the first anchoring strength is less than 1.0*10 -6 J / m 2 In some embodiments, the first anchoring strength is less than 8.0*10 -7 J / m 2 In some embodiments, the first anchoring strength is less than 6.0*10 -7 J / m 2 In addition, in this embodiment, the second anchoring strength is greater than 1.0*10 -4 J / m 2 In some embodiments, the second anchoring strength is greater than 1.2*10 -4 J / m 2 In some embodiments, the second anchoring strength is greater than 1.4*10 -4 J / m2 .

[0035] In some embodiments, the first alignment layer AL1 and the second alignment layer AL2 may include different materials, so that the first anchoring strength and the second anchoring strength may be different. For example, the material of the second alignment layer AL2 may include polyimide, polyacrylic acid, or other suitable materials, and the first alignment layer AL1 may include any suitable material different from the material of the second alignment layer AL2. In some embodiments, the friction angle of the first alignment layer AL1 and the friction angle of the second alignment layer AL2 may be different, so that the first anchoring strength and the second anchoring strength are different. The first anchoring strength and the second anchoring strength may be made different by other methods, and are not limited to the above method.

[0036] like Figure 1 As shown, in this embodiment, the surface S2 of the second alignment layer AL2 can be rubbed along a direction parallel to the direction Y. In the present invention, angles can be used to represent directions, where the direction X can be defined as 0 degrees, the direction Y can be defined as 90 degrees, the direction -X can be defined as 180 degrees, and the direction -Y can be defined as 270 degrees. Therefore, the surface S2 of the second alignment layer AL2 of this embodiment can be rubbed along a direction of 90 degrees or 270 degrees. For example, Figure 1 As shown, the rubbing direction RD2 of the second alignment layer AL2 can be direction Y or a 90 degree direction, but is not limited thereto. The definition of directions represented by angles in the following text can be referred to above, so it will not be repeated here.

[0037] In this embodiment, the surface S1 of the first alignment layer AL1 may be rubbed along a direction opposite to the rubbing direction RD2 of the second alignment layer AL2. Figure 1 As shown, the rubbing direction RD1 of the first alignment layer AL1 may be opposite to the rubbing direction RD2 of the second alignment layer AL2, that is, direction -Y or 270 degrees, but not limited thereto. In some embodiments, the surface S1 of the first alignment layer AL1 may not be rubbed, and the rubbing direction RD2 of the second alignment layer AL2 may be direction Y or direction -Y.

[0038] In the present embodiment, through the design of the first alignment layer AL1 and the second alignment layer AL2, the liquid crystal molecules LCM in the viewing angle control medium VM can be arranged roughly along the horizontal alignment (horizontal alignment) and can have a pretilt angle less than or equal to 20 degrees. The liquid crystal molecules LCM can be roughly arranged horizontally due to the influence or definition of the first alignment layer AL1 and the second alignment layer AL2, which can be defined as horizontal alignment in the present invention. In some embodiments, the pretilt angle of the liquid crystal molecules LCM can be less than or equal to 15 degrees. In some embodiments, the pretilt angle of the liquid crystal molecules LCM can be less than or equal to 10 degrees. The alignment of the above-mentioned liquid crystal molecules LCM can be seen Figure 1 It should be noted that in other embodiments, although the surface S1 of the first alignment layer AL1 may not be rubbed, the liquid crystal molecules LCM may still be aligned in the manner shown in state (I) by the intermolecular forces between the liquid crystal molecules LCM.

[0039] In the present embodiment, the first polarizer PL1 may be disposed on a side of the first substrate SB1 away from the first alignment layer AL1, and the second polarizer PL2 may be disposed on a side of the second substrate SB2 away from the second alignment layer AL2, but the present invention is not limited thereto. In the present embodiment, the polarization axis of the first polarizer PL1 may be parallel to the direction X (i.e., the direction of 0 degrees) or the direction Y (i.e., the direction of 90 degrees), and the polarization axis of the second polarizer PL2 may be parallel to the polarization axis of the first polarizer PL1.

[0040] like Figure 1 As shown, the viewing angle control device 100 also includes a first electrode EL1 and a second electrode EL2. The first electrode EL1 can be arranged between the first substrate SB1 and the first alignment layer AL1, and the second electrode EL2 can be arranged between the second substrate SB2 and the second alignment layer AL2, but it is not limited thereto. The first electrode EL1 and the second electrode EL2 can include any suitable transparent conductive material, such as indium tin oxide (ITO), but it is not limited thereto. In this embodiment, the voltage difference between the first electrode EL1 and the second electrode EL2 can generate an electric field. In some embodiments, a common voltage can be applied to the second electrode EL2. At this time, when no voltage is applied to the first electrode EL1, no electric field is generated; and when a voltage is applied to the first electrode EL1, an electric field can be generated. In some embodiments, a common voltage can be applied to the first electrode EL1, and a voltage can be applied to the second electrode EL2 to generate an electric field. Although Figure 1Not shown, the viewing angle control device 100 may further include a circuit layer electrically connected to the first electrode EL1 and / or the second electrode EL2 to provide a voltage. The circuit layer may include any suitable active components and / or passive components, and the present invention does not limit the structure of the circuit layer. The electric field generated by the voltage difference between the first electrode EL1 and the second electrode EL2 may twist the liquid crystal molecules LCM to change the arrangement of the liquid crystal molecules LCM, that is, change the arrangement state of the liquid crystal molecules LCM, and thus change the mode of the viewing angle control device 100. The mode of the viewing angle control device 100 will be described in detail below.

[0041] In this embodiment, if Figure 1 As shown in the state (I), when no voltage difference is applied between the first electrode EL1 and the second electrode EL2 (for example, no voltage is applied to the first electrode EL1 or the second electrode EL2), the alignment of the liquid crystal molecules LCM may be determined by the first alignment layer AL1 and / or the second alignment layer AL2. The arrangement of the liquid crystal molecules LCM may refer to the above content and as shown in Figure 1 As shown in state (I). In this case, since the polarization axis of the first polarizer PL1 and the polarization axis of the second polarizer PL2 are parallel to each other, and the liquid crystal molecules LCM can be aligned in the same direction, the linear polarized light passing through the first polarizer PL1 and the viewing angle control medium VM can also pass through the second polarizer PL2, or the linear polarized light passing through the second polarizer PL2 and the viewing angle control medium VM can also pass through the first polarizer PL1. In this way, when the viewing angle control device 100 shown in state (I) is applied to an electronic device, such as a display device, the display device (or the viewing angle control device 100) can be in a sharing mode. Specifically, in the sharing mode of the display device, the viewing angle control device 100 may not affect the light emitted by the display device, so that the display device can display images normally.

[0042] In detail, Figure 2 As shown, Figure 2 The profile (I) shows the brightness of light passing through the viewing angle control device 100 in the sharing mode, with a viewing angle from 0 degrees (center) to 80 degrees in different directions. The directions "up", "down", "right" and "left" can be the measurement directions of the light brightness. Figure 2 In the figure, the dots are used to represent the brightness of the light passing through the viewing angle control device 100. Specifically, the greater the density of the dots, the lower the brightness of the light, and the smaller the density of the dots, the higher the brightness of the light. It should be noted that Figure 2 The direction "up" can correspond to Figure 1 direction "up", and Figure 2 The direction "down" can correspond to Figure 1 direction "down". That is, Figure 2The direction "up" can correspond to Figure 1 direction Y, and Figure 2 The direction "down" can correspond to Figure 1 direction -Y. Similarly, Figure 2 The direction "right" can correspond to Figure 1 direction X, and Figure 2 The direction "left" can correspond to Figure 1 Direction - X. Figure 2 As shown in the outline (I), in sharing mode ( Figure 1 In the state (I) shown in FIG. 1 ), the brightness of light passing through the viewing angle control device 100 does not significantly decrease as the viewing angle increases. That is, when the viewing angle control device 100 is applied to a display device, the viewing angle control device 100 does not significantly affect the display effect of the display device.

[0043] As described above, the first anchoring strength of the first alignment layer AL1 may be less than the second anchoring strength of the second alignment layer AL2. Therefore, when a voltage difference is applied between the first electrode EL1 and the second electrode EL2 and an electric field is generated, the liquid crystal molecules LCM adjacent to the first alignment layer AL1 (e.g., liquid crystal molecules LCM1) may be more susceptible to the electric field than the liquid crystal molecules LCM adjacent to the second alignment layer AL2 (e.g., liquid crystal molecules LCM2). That is, under the influence of the electric field, the liquid crystal molecules LCM1 may be more susceptible to rotation than the liquid crystal molecules LCM2. For example, in some embodiments, the liquid crystal molecules LCM1 adjacent to the first alignment layer AL1 may rotate due to the influence of the electric field, while the liquid crystal molecules LCM2 adjacent to the second alignment layer AL2 may not rotate because the second anchoring strength is large enough to maintain the alignment of the liquid crystal molecules LCM2.

[0044] In this embodiment, if Figure 1 As shown in state (II), a voltage difference V1 can be applied between the first electrode EL1 and the second electrode EL2 to generate an electric field, wherein the liquid crystal molecules LCM adjacent to the first alignment layer AL1 (for example, liquid crystal molecules LCM1) can be affected by the electric field and rotate, while the liquid crystal molecules LCM adjacent to the second alignment layer AL2 (for example, liquid crystal molecules LCM2) can maintain their alignment in the presence of the electric field. In detail, when a voltage difference V1 is applied between the first electrode EL1 and the second electrode EL2, the liquid crystal molecules LCM adjacent to the first alignment layer AL1 can be arranged vertically (can be defined as having a vertical alignment), while the liquid crystal molecules LCM adjacent to the second alignment layer AL2 can still be arranged horizontally (can be defined as having a horizontal alignment), similar to Figure 1In addition, the liquid crystal molecules LCM that are not adjacent to the first alignment layer AL1 and the second alignment layer AL2 can be tilted to different degrees. The tilt degree (or tilt angle) of a liquid crystal molecule LCM can increase as the distance between the liquid crystal molecule LCM and the second alignment layer AL2 increases, such as Figure 1 As shown in state (II). In addition, the degree of inclination of a liquid crystal molecule LCM will be affected by the electric field strength and / or the elastic coefficient of the liquid crystal molecule LCM. Therefore, when a voltage difference V1 is applied between the first electrode EL1 and the second electrode EL2, the liquid crystal molecules LCM can be arranged in a mixed manner, which can be defined as having a hybrid alignment in the present invention. Specifically, from the liquid crystal molecules LCM adjacent to the second alignment layer AL2 to the liquid crystal molecules LCM adjacent to the first alignment layer AL1, the alignment of the liquid crystal molecules LCM can gradually change from horizontal alignment to vertical alignment. In this case, the brightness of light at a large angle will decrease after passing through the viewing angle control device 100. Therefore, when the viewing angle control device 100 shown in state (II) is applied to a display device, the viewing angle control device 100 can provide a privacy function, and the display device (or the viewing angle control device 100) can be in a privacy state, thereby achieving an anti-peeping effect.

[0045] like Figure 2 As shown, Figure 2 The profile (II) shows the brightness of light passing through the viewing angle control device 100 in the privacy mode, with a viewing angle from 0 degrees (center) to 80 degrees in different directions. It can be seen from the profile (II) that when the viewing angle control device 100 is in the privacy mode (such as Figure 1 ), the brightness of the light passing through the viewing angle control device 100 will significantly decrease as the viewing angle becomes larger. In this embodiment, the "privacy mode" may include a situation in which the brightness of the light at a viewing angle of 45 degrees in the direction "right" and the direction "left" is less than or equal to 10% of the brightness of the light at a viewing angle of 0 degrees (i.e., the brightness measured in the normal direction of the viewing angle control device 100). That is, when the viewing angle control device 100 is in the privacy mode, in the directions "right" and "left", the ratio of the brightness of the light passing through the viewing angle control device 100 at a viewing angle of 45 degrees to the brightness of the light passing through the viewing angle control device 100 at a viewing angle of 0 degrees may be less than or equal to 10%. Therefore, the brightness of large-angle light can be reduced by the viewing angle control device 100, thereby achieving an anti-peeping effect.

[0046] It should be noted that the voltage difference V1 can be determined according to the first anchoring strength, the second anchoring strength and / or the elastic coefficient of the liquid crystal molecules LCM. In detail, the voltage difference V1 can be within a certain range, so that under the action of the electric field generated by the voltage difference V1, the liquid crystal molecules LCM adjacent to the first alignment layer AL1 can rotate and present a vertical alignment, while the liquid crystal molecules LCM adjacent to the second alignment layer AL2 are still horizontally aligned, that is, the alignment of the liquid crystal molecules LCM adjacent to the second alignment layer AL2 is not affected by the applied electric field. In other words, the electric field strength generated by the voltage difference V1 is sufficient to affect the alignment of the liquid crystal molecules LCM adjacent to the first alignment layer AL1, but is not sufficient to affect the alignment of the liquid crystal molecules LCM adjacent to the second alignment layer AL2. In some cases, when the voltage difference V1 is too large, all the liquid crystal molecules LCM will be affected by the electric field and present a vertical alignment, thereby reducing the display effect of the electronic device using the viewing angle control device 100. In this case, when the viewing angle control device 100 is applied to a display device, the display effect of the display device will be affected by the viewing angle control device 100. In some cases, when the voltage difference V1 is too low, the privacy function provided by the present invention may not be obvious.

[0047] Therefore, by making the first anchoring strength of the first alignment layer AL1 smaller than the second anchoring strength of the second alignment layer AL2, the sharing mode and the privacy mode of the viewing angle control device 100 can be switched by adjusting the voltage difference between the first electrode EL1 and the second electrode EL2.

[0048] It should be noted that the structure of the viewing angle control device 100 of this embodiment is not based on Figure 1 In some embodiments, according to the design requirements of the viewing angle control device 100, the viewing angle control device 100 may further include other suitable film layers and / or elements.

[0049] More embodiments of the present invention will be described below. In order to simplify the description, the same film layers or components in the following embodiments will be labeled with the same reference numerals, and their features will not be repeated.

[0050] Please refer to Figure 3 , Figure 3 2 is a cross-sectional view of an electronic device according to a second embodiment of the present invention. In this embodiment, the viewing angle control device 200 applied to the electronic device ED includes a viewing angle control medium VM, and the viewing angle control medium VM may include a liquid crystal layer having a plurality of liquid crystal molecules LCM, wherein the liquid crystal molecules LCM may be negative liquid crystal molecules, but not limited thereto. According to this embodiment, Figure 3As shown in the state (I), the liquid crystal molecules LCM in the viewing angle control device 200 can be arranged substantially vertically (i.e., have a vertical alignment according to the present invention) when not affected by the electric field. Specifically, the pre-tilt angle of the liquid crystal molecules LCM can range from 80 degrees to 90 degrees, but is not limited thereto. Figure 3 The state (I) shows the initial state of the viewing angle control device 200, wherein no voltage difference is applied between the first electrode EL1 and the second electrode EL2. In the present embodiment, the first anchoring strength of the first alignment layer AL1 may be less than the second anchoring strength of the second alignment layer AL2, but is not limited thereto. In addition, when manufacturing the viewing angle control device 200, the surface of the alignment layer with weaker anchoring strength facing the viewing angle control medium VM may be subjected to a friction treatment. That is, in the present embodiment, the surface S1 of the first alignment layer AL1 may be rubbed, but is not limited thereto. The rubbing direction RD3 of the first alignment layer AL1 may be parallel to the direction Y, for example, the direction -Y (or the direction of 270 degrees), but is not limited thereto. The surface S2 of the second alignment layer AL2 may not be rubbed.

[0051] like Figure 3 As shown in state (II), when a voltage difference V2 is applied between the first electrode EL1 and the second electrode EL2, since the first anchoring strength is less than the second anchoring strength, the liquid crystal molecules LCM (e.g., liquid crystal molecules LCM1) adjacent to the first alignment layer AL1 will rotate due to the influence of the electric field, while the liquid crystal molecules LCM (e.g., liquid crystal molecules LCM2) adjacent to the second alignment layer AL2 may not rotate in the presence of the electric field. For example, the liquid crystal molecules LCM adjacent to the first alignment layer AL1 may have a horizontal alignment, while the liquid crystal molecules LCM adjacent to the second alignment layer AL2 may still have a vertical alignment. In addition, from the liquid crystal molecules LCM adjacent to the second alignment layer AL2 to the liquid crystal molecules LCM adjacent to the first alignment layer AL1, the alignment of the liquid crystal molecules LCM may gradually change from a vertical alignment to a horizontal alignment. That is, the liquid crystal molecules LCM may have a mixed alignment. Since the surface S1 of the first alignment layer AL1 may be rubbed between processes, the liquid crystal molecules LCM1 adjacent to the first alignment layer AL1 may be aligned in the same direction. In this case, the brightness of the light at a large angle will be reduced after passing through the viewing angle control device 200. Therefore, when the voltage difference V2 is applied, the viewing angle control device 200 can be switched to the privacy mode. The range of the voltage difference V2 can be determined according to the first anchoring strength, the second anchoring strength and / or the elastic coefficient of the liquid crystal molecule LCM.

[0052] like Figure 3As shown in state (III), when a voltage difference V3 is applied between the first electrode EL1 and the second electrode EL2, the liquid crystal molecules LCM adjacent to the second alignment layer AL2 may not be affected by the electric field due to the sufficiently strong second anchoring strength, while the remaining liquid crystal molecules LCM in the viewing angle control medium VM may be driven by the electric field to rotate. Therefore, the liquid crystal molecules LCM adjacent to the second alignment layer AL2 may still have a vertical alignment, while the other liquid crystal molecules LCM may have a horizontal alignment. In this case, the effect of the viewing angle control device 200 on the brightness of light may be reduced, and the viewing angle control device 200 may be in a sharing mode. The range of the voltage difference V3 may be determined according to the first anchoring strength, the second anchoring strength and / or the elastic coefficient of the liquid crystal molecules LCM.

[0053] In this embodiment, the voltage difference V3 may be greater than the voltage difference V2. That is, as the voltage difference between the first electrode EL1 and the second electrode EL2 gradually increases from 0, the viewing angle control device 200 may change from the initial state ( Figure 3 Switch to private mode ( Figure 3 state (II)), and then switch from private mode to sharing mode ( Figure 3 Therefore, the sharing mode and the privacy mode of the viewing angle control device 200 can be switched by adjusting the voltage difference between the first electrode EL1 and the second electrode EL2.

[0054] The features of other elements and / or film layers of the viewing angle control device 200 can be found in the above text, so they will not be described in detail again.

[0055] Please refer to Figure 4 and Figure 5 , Figure 4 is a cross-sectional schematic diagram of an electronic device according to a third embodiment of the present invention, Figure 5 Schematic diagram of several examples of electronic devices according to the third embodiment of the present invention. According to this embodiment, the viewing angle control device 300 applied to the electronic device ED also includes a compensation layer CM1 disposed between the first polarizer PL1 and the viewing angle control medium VM. For example, the compensation layer CM1 may be disposed between the first substrate SB1 and the first polarizer PL1, but is not limited thereto. In some embodiments, the viewing angle control device 300 may also include a compensation layer CM2 disposed between the second polarizer PL2 and the viewing angle control medium VM. For example, the compensation layer CM2 may be disposed between the second substrate SB2 and the second polarizer PL2, but is not limited thereto. In some embodiments, the viewing angle control device 300 may include one or both of the compensation layer CM1 and the compensation layer CM2. By arranging the compensation layer CM1 and / or the compensation layer CM2 in the viewing angle control device 300, when the viewing angle control device 300 is applied to a display device, the display effect of the display device can be improved.

[0056] In the present embodiment, the compensation layer CM1 and the compensation layer CM2 may include a multilayer structure respectively. The multilayer structure of the compensation layer CM1 (or the compensation layer CM2) may be formed by stacking film layers selected from a positive A plate, a negative C plate, and a biaxial film, but is not limited thereto. In some embodiments, the compensation layer CM1 (or the compensation layer CM2) may include a multilayer structure formed by stacking other suitable film layers. The features of the positive A plate, the negative C plate, and the biaxial film will be described below.

[0057] In this embodiment, the positive A-plate has an in-plane retardation R0, wherein the in-plane retardation R0 of the positive A-plate can be obtained by the following formula (2):

[0058] R0=(nx-ny)*d (2)

[0059] Wherein nx and ny are the refractive indices of the positive A plate in directions X and Y, respectively, and d is the thickness of the positive A plate.

[0060] According to the present embodiment, the in-plane phase difference R0 of the positive A-plate may range from 100 nanometers (nm) to 300 nm (ie, 100 nm≤R0≤300 nm), but is not limited thereto.

[0061] In this embodiment, the negative C-plate has an out-of-plane retardation Rth, wherein the out-of-plane retardation Rth of the negative C-plate can be obtained by the following formula (3):

[0062] Rth=1 / 2*[(nx-nz)+(ny-nz)]*d (3)

[0063] Wherein nx, ny and nz may be the refractive indices of the negative C plate in directions X, Y and Z respectively, and d is the thickness of the negative C plate.

[0064] According to this embodiment, the out-of-plane phase difference of the negative C-plate may be less than 300 nanometers, but is not limited thereto.

[0065] In this embodiment, the biaxial film has an in-plane phase difference and an out-of-plane phase difference, wherein the in-plane phase difference and the out-of-plane phase difference can be obtained by the above formula. According to this embodiment, the in-plane phase difference of the biaxial film can range from 50nm to 150nm (i.e., 50nm≤R0≤150nm), and the out-of-plane phase difference of the biaxial film can range from 120nm to 160nm (i.e., 120nm≤Rth≤160nm), but is not limited thereto.

[0066] Figure 5 An example of the compensation layer CM1 of the viewing angle control device 300 is shown, wherein the compensation layer CM1 can be formed by stacking film layers selected from a positive A plate A1, a biaxial film B1, and a negative C plate C1. To simplify the diagram, Figure 5 The first substrate SB1, the second substrate SB2, the first electrode EL1 and the second electrode EL2 are omitted.

[0067] In example (I), the compensation layer CM1 may include two positive A plates A1, or the compensation layer CM1 may be formed by stacking two positive A plates A1. The in-plane phase difference of the two positive A plates A1 may be 135 nm, but is not limited thereto. In some embodiments, the in-plane phase difference of the two positive A plates A1 may be 270 nm. The direction of the axis of the positive A plate A1 located below may be in the direction of 90 degrees, that is, parallel to the direction Y; and the direction of the axis of the positive A plate A1 located above may be in the direction of 0 degrees, that is, parallel to the direction X, but is not limited thereto. In other words, the axes of the two positive A plates A1 may be perpendicular to each other. In this embodiment, the polarization axis of the first polarizer PL1 and the polarization axis of the second polarizer PL2 may be in the direction of 90 degrees, that is, parallel to the direction Y.

[0068] In example (II), the compensation layer CM1 may include two positive A plates A1 and one negative C plate C1, wherein the negative C plate C1 is disposed between the two positive A plates A1. In some embodiments, the thickness of the in-plane phase difference of the positive A plate A1 is greater than the thickness of the out-of-plane phase difference of the negative C plate C1, but is not limited thereto. The in-plane phase difference of the two positive A plates A1 may be 135 nm, but is not limited thereto. The out-of-plane phase difference of the negative C plate C1 may be 100 nm, but is not limited thereto. The direction of the axis of the positive A plate A1 located below may be in a direction of 90 degrees, i.e. parallel to direction Y. The direction of the axis of the positive A plate A1 located above may be in a direction of 0 degrees, i.e. parallel to direction X. The polarization axis of the first polarizer PL1 and the polarization axis of the second polarizer PL2 may be in a direction of 90 degrees, i.e. parallel to direction Y.

[0069] In example (III), the compensation layer CM1 may include a positive A-plate A1 and a biaxial film B1, wherein the biaxial film B1 may be disposed on the positive A-plate A1. That is, the biaxial film B1 may be disposed between the positive A-plate A1 and the first polarizer PL1. In some embodiments, the thickness of the in-plane phase difference of the positive A-plate A1 is greater than the thickness of the out-of-plane phase difference of the biaxial film B1, but is not limited thereto. The in-plane phase difference of the positive A-plate A1 may be 135 nm, but is not limited thereto. The in-plane phase difference of the biaxial film B1 may be 50 nm, and the out-of-plane phase difference of the biaxial film B1 may be 130 nm, but is not limited thereto. The direction of the axis of the positive A-plate A1 may be in a direction of 90 degrees, i.e. parallel to the direction Y. The direction of the axis of the biaxial film B1 may be in a direction of 0 degrees, i.e. parallel to the direction X. The polarization axis of the first polarizer PL1 and the polarization axis of the second polarizer PL2 may be in a direction of 90 degrees, i.e. parallel to the direction Y.

[0070] It should be noted that Figure 5 The structure of the compensation layer CM1 is only exemplary, and the present invention is not limited thereto. The features of other elements and / or film layers of the viewing angle control device 300 can be referred to above, so they will not be described in detail.

[0071] The structure of the compensation layer CM2 may refer to the structure of the compensation layer CM1. It should be noted that the structure of the compensation layer CM1 may be the same as or different from the structure of the compensation layer CM2.

[0072] Please refer to Figure 6 , Figure 6 Schematic cross-sectional view of an electronic device according to a fourth embodiment of the present invention. According to this embodiment, in the viewing angle control device 400, the first electrode EL1' may be arranged between the first substrate SB1 and the first alignment layer AL1, and the second electrode EL2' may be arranged between the second substrate SB2 and the second alignment layer AL2. In addition, the first alignment layer AL1 may partially overlap the first electrode EL1'. In detail, in the top-view direction (i.e., direction Z) of the viewing angle control device 400, the first electrode EL1' may overlap a portion of the first alignment layer AL1, and another portion of the first alignment layer AL1 may not overlap the first electrode EL1'. In this case, the first electrode EL1' may not be arranged between a portion of the first substrate SB1 and a portion of the first alignment layer AL1 corresponding to the portion in the direction Z. The second electrode EL2' may be arranged corresponding to the first electrode EL1'. That is, in the top-view direction of the viewing angle control device 400, the second electrode EL2' may overlap the first electrode EL1' accordingly. Therefore, the second alignment layer AL2 may partially overlap the second electrode EL2 ′, that is, a portion of the second alignment layer AL2 may not overlap the second electrode EL2 ′ in the Z direction.

[0073] like Figure 6As shown, the viewing angle control device 400 may have a first region R1 and a second region R2, wherein the second region R2 may be a region of the viewing angle control device 400 where the first electrode EL1' and the second electrode EL2' are disposed, and the first region R1 may be other regions of the viewing angle control device 400 except the second region R2. That is, the first electrode EL1' and the second electrode EL2' may be correspondingly disposed in the second region R2, but not correspondingly disposed in the first region R1. Through the design of the first electrode EL1' and the second electrode EL2', different regions of the viewing angle control device 400 may be in different modes. Figure 6 As shown in the state (I), when no voltage difference is applied between the first electrode EL1' and the second electrode EL2', the first region R1 and the second region R2 can both be in the sharing mode. Figure 6 As shown in state (II), when a voltage difference V4 is applied between the first electrode EL1' and the second electrode EL2', since the first anchoring strength of the first alignment layer AL1 is less than the second anchoring strength of the second alignment layer AL2 (the details can be seen above, so they will not be repeated here), the liquid crystal molecules LCM in the second region R2 may be affected by the electric field and present a mixed alignment; while the alignment or arrangement of the liquid crystal molecules LCM in the first region R1 may not be affected by the electric field. The range of the voltage difference V4 can refer to the above content. In this case, the first region R1 of the viewing angle control device 400 may be in the sharing mode, and the second region R2 of the viewing angle control device 400 may be in the privacy mode. In this way, the viewing angle control device 400 may be partially in the privacy mode.

[0074] In some embodiments, the portion of the first alignment layer AL1 overlapping the first electrode EL1' may have a first anchoring strength, and the other portion of the first alignment layer AL1 not overlapping the first electrode EL1' may have a third anchoring strength, wherein the first anchoring strength may be less than the third anchoring strength. For example, the third anchoring strength may be the same as the second anchoring strength of the second alignment layer AL2, and the second anchoring strength of the second alignment layer AL2 is greater than the first anchoring strength, but is not limited thereto. Under this design, the anchoring strength of the portion of the first alignment layer AL1 corresponding to the second region R2 may be less than the anchoring strength of the portion of the first alignment layer AL1 corresponding to the first region R1. In some embodiments, during the manufacturing process, the surface of the portion of the first alignment layer AL1 overlapping the first electrode EL1' may not be rubbed, while the surface of the other portion of the first alignment layer AL1 not overlapping the first electrode EL1' may be rubbed.

[0075] It should be noted that Figure 6 The ranges of the first region R1 and the second region R2 are only exemplary, and the present embodiment is not limited thereto. The ranges of the first region R1 and the second region R2 may be determined according to the design requirements of the viewing angle control device 400 .

[0076] Please refer to Figure 7 and Figure 8 , Figure 7 is a cross-sectional schematic diagram of an electronic device according to a fifth embodiment of the present invention, Figure 8 Schematic diagram of an electronic device in several modes according to a fifth embodiment of the present invention. According to this embodiment, in a viewing angle control device 500 included in an electronic device ED, a first electrode EL1 disposed between a first substrate SB1 and a first alignment layer AL1 may be divided into a plurality of sub-electrodes that are not electrically connected to each other. For example, Figure 7 As shown, the first electrode EL1 may include a first sub-electrode EL11 and a second sub-electrode EL12, wherein the first sub-electrode EL11 is not electrically connected to the second sub-electrode EL12, and a gap GP is provided between the first sub-electrode EL11 and the second sub-electrode EL12. In some embodiments, the first electrode EL1 may include more than two sub-electrodes that are not electrically connected to each other and are separated. In some embodiments, the second electrode EL2 may include a plurality of sub-electrodes, and the first electrode EL1 may be continuously disposed between the first substrate SB1 and the first alignment layer AL1.

[0077] like Figure 7 As shown, the sub-electrodes of the first electrode EL1 may respectively correspond to different areas of the viewing angle control device 500. For example, the first sub-electrode EL11 may correspond to the first area R1 of the viewing angle control device 500, and the second sub-electrode EL12 may correspond to the second area R2 of the viewing angle control device 500. According to this embodiment, since the sub-electrodes in the first electrode EL1 corresponding to different areas of the viewing angle control device 500 are not electrically connected to each other, different areas of the viewing angle control device 500 may be in different modes at the same time. For example, when no voltage difference is applied between the first sub-electrode EL11 and the second electrode EL2 and between the second sub-electrode EL12 and the second electrode EL2, the first area R1 and the second area R2 of the viewing angle control device 500 may both be in sharing mode. Figure 8 In the state (I) shown, when a voltage difference V5 is applied between the first sub-electrode EL11 and the second electrode EL2, and a voltage difference V6 is applied between the second sub-electrode EL12 and the second electrode EL2, the first region R1 and the second region R2 of the viewing angle control device 500 can both be in the privacy mode. Figure 8 In the state (II) shown, when no voltage difference is applied between the first sub-electrode EL11 and the second electrode EL2, and a voltage difference V6 is applied between the second sub-electrode EL12 and the second electrode EL2, the first region R1 can be in the sharing mode, and the second region R2 can be in the privacy mode. Figure 8In the state (III) shown, when a voltage difference V5 is applied between the first sub-electrode EL11 and the second electrode EL2, and no voltage difference is applied between the second sub-electrode EL12 and the second electrode EL2, the first region R1 can be in a privacy mode, and the second region R2 can be in a sharing mode. Therefore, the modes exhibited by each region of the viewing angle control device 500 can be independently controlled. The ranges of the voltage difference V5 and the voltage difference V6 can refer to the above content. The features of other elements and / or film layers of the viewing angle control device 500 can refer to the above. The voltage difference V5 and the voltage difference V6 can be the same or different.

[0078] Please refer to Fig. 9 , Fig. 9 Schematic diagram of several electronic devices including the viewing angle control device in the present invention. According to the present invention, the viewing angle control device VD can be applied to any suitable electronic device ED, such as a display device, but not limited thereto. The viewing angle control device VD mentioned herein may include any of the above-mentioned viewing angle control devices. In some embodiments, the viewing angle control device VD can be applied to a non-self-luminous display device, such as a liquid crystal display device, but not limited thereto. For example, Fig. 9 As shown in the structure (I), the viewing angle control device VD can be applied to a liquid crystal display device having a liquid crystal display panel LD and a backlight module BL, wherein the viewing angle control device VD can be arranged between the liquid crystal display panel LD and the backlight module BL. In some embodiments, Fig. 9 As shown in the structure (II), the viewing angle control device VD can be arranged on the side of the liquid crystal display panel LD opposite to the backlight module BL. That is, the liquid crystal display panel LD can be arranged between the viewing angle control device VD and the backlight module BL. The viewing angle control device VD can be applied to a reflective display device. For example, Fig. 9 As shown in the structure (III), the viewing angle control device VD can be arranged on the reflective display device RD so that light reflected from the reflective display device RD can pass through the viewing angle control device VD. The viewing angle control device VD can be applied to a self-luminous display device, such as a light-emitting diode display device. The light-emitting diode display device can, for example, include an inorganic light-emitting diode or an organic light-emitting diode (OLED). The inorganic light-emitting diode can, for example, include a millimeter-type light-emitting diode (mini LED) or a micro light-emitting diode (micro LED). As shown in FIG. Fig. 9 As shown in structure (IV), the viewing angle control device VD can be arranged on the self-luminous display device EMD, so that light emitted from the self-luminous display device EMD can pass through the viewing angle control device VD. The application of the above-mentioned viewing angle control device VD is only exemplary, and the present invention is not limited thereto.

[0079] In summary, the present invention provides a viewing angle control device and a related electronic device, wherein the viewing angle control device may include a first alignment layer having a first anchoring strength and a second alignment layer having a second anchoring strength, and the first anchoring strength is less than the second anchoring strength. The viewing angle control device may also include a compensation layer disposed between the first polarizer and the viewing angle control medium. Through the above design, the privacy function provided by the viewing angle control device can be improved while reducing the influence of the viewing angle control device on the display effect of the electronic device to which it is applied.

[0080] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A viewing angle control device, characterized in that: include: a first substrate; a second substrate, arranged opposite to the first substrate; A viewing angle control medium is disposed between the first substrate and the second substrate; a first alignment layer, disposed between the first substrate and the viewing angle control medium, wherein the first alignment layer has a first anchoring strength; a second alignment layer, disposed between the second substrate and the viewing angle control medium, wherein the second alignment layer has a second anchoring strength; a first polarizer, wherein the first substrate is disposed between the first polarizer and the first alignment layer; and a compensation layer, disposed between the first polarizer and the viewing angle control medium; Wherein the first anchoring strength is less than the second anchoring strength.

2. The viewing angle control device according to claim 1, characterized in that: A second polarizer is also included, and the second substrate is arranged between the second polarizer and the second alignment layer.

3. The viewing angle control device according to claim 1, characterized in that: The compensation layer includes two positive A-plates.

4. The viewing angle control device according to claim 3, characterized in that: The in-plane phase difference of one of the two positive A-plates ranges from 100 nanometers to 300 nanometers.

5. The viewing angle control device according to claim 3, characterized in that: The compensation layer further includes a negative C plate, and the negative C plate is arranged between the two positive A plates.

6. The viewing angle control device according to claim 5, characterized in that: The out-of-plane phase difference of the negative C-plate is less than 300 nanometers.

7. The viewing angle control device according to claim 1, characterized in that: The compensation layer includes a positive A plate and a biaxial film, and the biaxial film is arranged between the positive A plate and the first polarizer.

8. The viewing angle control device according to claim 7, characterized in that: The in-plane phase difference of the biaxial film ranges from 50 nm to 150 nm.

9. The viewing angle control device according to claim 7, characterized in that: The out-of-plane retardation of the biaxial film ranges from 120 nm to 160 nm.

10. The viewing angle control device according to claim 1, characterized in that: Another compensation layer is also included, and the other compensation layer is arranged between the second polarizer and the viewing angle control medium.

11. The viewing angle control device according to claim 1, characterized in that: The invention also includes a first electrode and a second electrode. The first electrode is arranged between the first substrate and the first alignment layer, and the second electrode is arranged between the second substrate and the second alignment layer.

12. The viewing angle control device according to claim 11, characterized in that: The first electrode is disposed between the first substrate and the first alignment layer, and the first alignment layer partially overlaps the first electrode.

13. The viewing angle control device according to claim 12, characterized in that: An anchor strength of a portion of the first alignment layer overlapping the first electrode is smaller than an anchor strength of another portion of the first alignment layer not overlapping the first electrode.

14. The viewing angle control device according to claim 12, characterized in that: The second electrode is disposed between the second substrate and the second alignment layer, and in a top-view direction of the viewing angle control device, the second electrode overlaps the first electrode.

15. The viewing angle control device according to claim 11, characterized in that: The first electrode includes a first sub-electrode and a second sub-electrode, and the first sub-electrode is not electrically connected to the second sub-electrode.

16. The viewing angle control device according to claim 1, characterized in that: The phase delay of the viewing angle control medium is greater than 1000 nanometers.

17. The viewing angle control device according to claim 1, characterized in that: The first anchoring strength is less than 1.0*10 -6 J / m 2 .

18. The viewing angle control device according to claim 1, characterized in that: The second anchoring strength is greater than 1.0*10 -4 J / m 2 .

19. The viewing angle control device according to claim 1, characterized in that: The material of the first alignment layer is different from the material of the second alignment layer.

20. The viewing angle control device according to claim 19, characterized in that: The material of the second alignment layer includes polyimide or polyacrylic acid.

Images