TWI863505B - Viewing angle control device - Google Patents

Abstract

A viewing angle control device with a display panel includes a first substrate, a second substrate, a liquid crystal layer and a plurality of viewing angle control areas. The second substrate is disposed opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. The viewing angle control areas are disposed on the first substrate and arranged in an array, wherein each of the viewing angle control areas vertically projected on the display panel includes at least one pixel structure, and each of the viewing angle control areas includes at least one anti-peep unit, each anti-peep unit includes a central portion and an outer portion surrounding the central portion. The height of the first substrate to the central portion is greater than the height of the first substrate to the outer portion, and the thickness of the liquid crystal corresponding to the central portion to the second substrate is different from the thickness of the liquid crystal corresponding to the peripheral portion to the second substrate.

Description

View control device

The present invention relates to a viewing angle control device used with a display, in particular to a viewing angle control device including a plurality of anti-peeping units.

Recently, as people's awareness of privacy has improved, display devices with anti-peeping functions have become increasingly popular. Therefore, how to further improve the viewing angle control performance of display devices has become a hotly debated issue.

The present invention relates to a viewing angle control device used with a display panel. The viewing angle control device includes a plurality of anti-peeping units. The thickness of the liquid crystal corresponding to the second substrate in the center of each anti-peeping unit is different from the thickness of the liquid crystal corresponding to the second substrate in the peripheral part, which can produce a wide range of anti-peeping angles.

According to an embodiment of the present invention, a viewing angle control device is provided. The viewing angle control device includes a first substrate, a second substrate, a liquid crystal layer and a plurality of viewing angle control areas. The second substrate is arranged opposite to the first substrate. The liquid crystal layer is arranged between the first substrate and the second substrate. The viewing angle control areas are arranged in an array on the first substrate, and each viewing angle control area includes at least one pixel structure vertically projected on the range of the display panel, and each viewing angle control area includes at least one anti-peeping unit, each anti-peeping unit includes a central part and a peripheral part surrounding the central part, the height from the first substrate to the central part is greater than the height from the first substrate to the peripheral part, wherein the liquid crystal thickness corresponding to the second substrate of the central part is different from the liquid crystal thickness corresponding to the second substrate of the peripheral part.

In order to have a better understanding of the above and other aspects of the present invention, the following is a specific example and a detailed description with the attached drawings as follows:

10,20: View control device

110,210: First substrate

112: First base plate

114: First electrode

116,216: First insulating layer

120: Second substrate

122: Second base plate

124: Second electrode

130: Liquid crystal layer

132: Liquid crystal molecules

140: Spacer

A10~A14,A20~A24: Projection area

AR: View control area

AU: Anti-observation unit

AUC: Central part

AUP: Outer part

AUP1: Part 1

AUP2: Part 2

AUP3: Part 3

AUP4: Part 4

D1: First direction

D2: Second direction

D3: Third direction

GC: Geometry Center

HC, H1~H4: thickness

HAC, HP1~HP4: Height

HS:Distance

LA: Long axis

WC, W1~W4: Width

X1~X4: horizontal distance difference

Figure 1A shows a top view of a viewing angle control device according to an embodiment of the present invention.

Figure 1B shows a cross-sectional view along the line B-B in Figure 1A.

Figure 1C shows a cross-section along the line C-C in Figure 1A.

Figure 2 shows a cross-sectional view of a viewing angle control device according to another embodiment of the present invention.

Figures 3A-3B show top views of the anti-penetration unit according to some embodiments of the present invention.

Figure 4 shows a top view of an anti-penetration unit according to another embodiment of the present invention.

Figures 5A-5B show top views of the viewing angle control area of the viewing angle control device according to some embodiments of the present invention.

Figures 6A-6B show top views of the anti-penetration unit according to some other embodiments of the present invention.

The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the drawings are simplified schematic diagrams, and the embodiments described are only partial embodiments of the present invention, not all embodiments. Therefore, only the components and combination relationships related to the present invention are shown to provide a clearer description of the basic structure or implementation method of the present invention, while the actual components and layout may be more complicated. In addition, for the convenience of explanation, the detailed proportions of the components shown in the drawings of the present invention can be adjusted according to the design requirements.

According to one embodiment, the present invention can be applied to an electrically controlled birefringence (ECB) type viewing angle control device, but the present invention is not limited thereto. The electrically controlled birefringence type viewing angle control device of the present invention has an anti-peeping function. The principle is to utilize the polarization effect of liquid crystal molecules on oblique angle light. When the liquid crystal molecules are driven to tilt, the oblique angle light passes through the tilted liquid crystal molecules and the polarization direction changes, so that it cannot pass through the upper polarizer. Therefore, the anti-peeping effect can be achieved at a specific viewing angle. Generally speaking, the thickness of the liquid crystal layer will affect the anti-peeping angle. For example, if the phase retardation is R, the difference in the biaxial refractive index of the liquid crystal layer is n, and the thickness of the liquid crystal layer is d, then R=n×d. Under a fixed voltage (e.g. 2.4V), when the phase delay R changes from 600nm to 1600nm, the viewing angle corresponding to the center of the anti-penetration area (i.e., the anti-penetration angle) can change from 60° to 30°. Therefore, by controlling the thickness of the liquid crystal layer, the anti-penetration angle can be adjusted. Since the viewing angle control device of the present case includes an anti-penetration unit and includes multiple different liquid crystal layer thicknesses, different liquid crystal layer thicknesses can produce anti-penetration effects for different viewing angles, respectively, and can create a wider range of anti-penetration angles.

FIG. 1A shows a top view of a viewing angle control device 10 according to an embodiment of the present invention. FIG. 1B shows a cross-sectional view along the B-B line in FIG. 1A. FIG. 1C shows a cross-sectional view along the C-C line in FIG. 1A. FIG. 1A may correspond to a plane formed by the second direction D2 and the third direction D3. FIG. 1B may correspond to a plane formed by the first direction D1 and the second direction D2. The first direction D1, the second direction D2, and the third direction D3 may be perpendicular to each other.

Please refer to Figures 1A to 1C at the same time. The viewing angle control device 10 includes a first substrate 110, a second substrate 120, a liquid crystal layer 130, and a plurality of viewing angle control areas AR. The second substrate 120 is disposed opposite to the first substrate 110. The plurality of viewing angle control areas AR can be connected to each other.

As shown in FIG. 1A , a plurality of viewing angle control areas AR are arranged in an array on a first substrate 110. The first substrate may correspond to a display panel (not shown) having a plurality of pixel structures. The vertical projection range of each viewing angle control area AR includes at least one pixel structure (not shown). That is, each viewing angle control area AR is projected along the first direction D1 onto a plane formed by the second direction D2 and the third direction D3 to form a range, and there may be 1, 2, 3 or more pixel structures (not shown) in this range. Each viewing angle control area AR includes at least one anti-peeping unit AU, and each anti-peeping unit AU includes a central portion AUC and a peripheral portion AUP surrounding the central portion AUC. The central portion AUC is in direct contact with the peripheral portion AUP. In some embodiments, in the first direction D1, each anti-peeping unit AU may correspond to 1, 2, 3 or more than 3 pixel structures (not shown). The number of anti-peeping units AU is plural, and the plural anti-peeping units AU may be connected to each other. As shown in FIG. 1B , the liquid crystal layer 130 is disposed between the first substrate 110 and the second substrate 120. The first substrate 110 includes a first bottom plate 112 and a first electrode 114 disposed on the first bottom plate 112. The viewing angle control device 10 further includes a first insulating layer 116 disposed on the first electrode 114. The first insulating layer 116 forms a plurality of anti-peeping units AU connected to each other. The second substrate 120 includes a second bottom plate 122 and a second electrode 124 disposed on the second bottom plate 122. The liquid crystal layer 130 may include a plurality of liquid crystal molecules 132, and the liquid crystal molecules 132 are arranged between the second electrode 124 and the first insulating layer 116. FIG. 1B only schematically shows a portion of the liquid crystal molecules 132 adjacent to the anti-seepage unit AU (i.e., the first insulating layer 116).

As shown in FIG. 1B , the height HAC from the first substrate 110 to the central portion AUC is greater than the height (e.g., heights HP1 to HP4) from the first substrate 110 to the peripheral portion AUP, so that the thickness of the liquid crystal layer 130 is different. Further, the thickness HC of the liquid crystal layer 130 corresponding to the second substrate 120 of the central portion AUC is different from the thickness (e.g., thickness H1 to H4) of the liquid crystal layer 130 corresponding to the second substrate 120 of the peripheral portion AUP. Each anti-seepage unit AU has a geometric center GC viewed from a top view (e.g., FIG. 1A ), that is, the height HAC formed along the first direction D1 between the top of the central portion AUC and the upper surface of the first substrate 110 may be greater than the height formed along the first direction D1 between the top of the peripheral portion AUP and the upper surface of the first substrate 110. In this embodiment, the peripheral portion AUP includes 4 vertical distances (i.e., different heights HP1-HP4), and these 4 vertical distances (i.e., heights HP1-HP4) decrease from the direction adjacent to the central portion AUC toward the direction away from the central portion AUC, but the present invention is not limited thereto. In other embodiments, the peripheral portion AUP and the first substrate 110 may include 2, 3, 5 or other vertical distances. According to some embodiments, when the anti-seepage unit AU is observed from a cross-sectional direction, the peripheral portion AUP and the first substrate 110 include at least two vertical distances, and at least two vertical distances decrease from the direction adjacent to the central portion AUC toward the direction away from the central portion AUC.

HS、H3

0.8×HS、H2

0.6 ×HS、H1

0.4×HS及HC

0.2×HS。 In the present embodiment, the peripheral portion AUP includes a first portion AUP1, a second portion AUP2, a third portion AUP3 and a fourth portion AUP4. The first portion AUP1 is closer to the central portion AUC than the second portion AUP2, the second portion AUP2 is closer to the central portion AUC than the third portion AUP3, and the third portion AUP3 is closer to the central portion AUC than the fourth portion AUP4. The fourth portions AUP4 of the adjacent anti-penetration units AU are connected to each other. Based on the first electrode 114 in a cross-sectional view of the viewing angle control device 10 (e.g., FIG. 1B ), the central portion AUC has a height HAC, the first portion AUP1 has a height HP1, the second portion AUP2 has a height HP2, the third portion AUP3 has a height HP3, and the fourth portion AUP4 has a height HP4, wherein HAC>HP1>HP2>HP3>HP4. In addition, the thickness of the liquid crystal layer 130 corresponding to the central portion AUC is HC, the thickness of the liquid crystal layer 130 corresponding to the first portion AUP1 is H1, the thickness of the liquid crystal layer 130 corresponding to the second portion AUP2 is H2, the thickness of the liquid crystal layer 130 corresponding to the third portion AUP3 is H3, and the thickness of the liquid crystal layer 130 corresponding to the fourth portion AUP4 is H4, wherein HC<H1<H2<H3<H4. It should be understood that in other embodiments, the peripheral portion AUP may be composed of the first portion AUP1 and the second portion AUP2; in other embodiments, the peripheral portion AUP may be composed of the first portion AUP1, the second portion AUP2, and the third portion AUP3. According to some embodiments, the distance between the first base plate 112 and the second base plate 122 in the first direction D1 is HS, and the viewing angle control device 10 meets the following conditions: H4

HS, H3

0.8×HS, H2

0.6 ×HS, H1

0.4×HS and HC

0.2×HS.

2HC、W1

2H1、W2

2H2、W3

2H3及W4

2H4。其中，WC、W1、W2、W3和W4可分別表示中心部分AUC、第一部分AUP1、第二部分AUP2、第三部分AUP3和第四部分AUP4在第二方向D2上所形成的最大寬度。 In a cross-sectional view of the viewing angle control device 10 (e.g., FIG. 1B ), the thickness of the liquid crystal layer 130 corresponding to the central portion AUC (i.e., the liquid crystal layer 130 overlapping the central portion AUC in the first direction D1) is HC, the thickness of the liquid crystal layer 130 corresponding to the first portion AUP1 (i.e., the liquid crystal layer 130 overlapping the first portion AUP1 in the first direction D1) is H1, and the thickness of the liquid crystal layer 130 corresponding to the second portion AUP2 is H2. The thickness of the liquid crystal layer 130 corresponding to the third portion AUP3 (i.e., the liquid crystal layer 130 overlapping the third portion AUP3 in the first direction D1) is H2, the thickness of the liquid crystal layer 130 corresponding to the fourth portion AUP4 (i.e., the liquid crystal layer 130 overlapping the fourth portion AUP4 in the first direction D1) is H4. In addition, the width of the central portion AUC is WC, the width of the first portion AUP1 is W1, the width of the second portion AUP2 is W2, the width of the third portion AUP3 is W3, and the width of the fourth portion AUP4 is W4, and the viewing angle control device 10 meets the following conditions: WC

2HC, W1

2H1, W2

2H2, W3

2H3 and W4

2H4. Wherein, WC, W1, W2, W3 and W4 may respectively represent the maximum widths formed by the central portion AUC, the first portion AUP1, the second portion AUP2, the third portion AUP3 and the fourth portion AUP4 in the second direction D2.

In a cross-sectional view of the viewing angle control device 10 (e.g., FIG. 1B ), the horizontal distance difference between the first portion AUP1 formed on the same side of the geometric center GC and the center portion AUC is X1 (i.e., the horizontal distance difference X1 formed between the outer edge of the first portion AUP1 located on the same side of the geometric center GC and the outer edge of the center portion AUC in the second direction D2), and the horizontal distance difference between the second portion AUP2 and the center portion AUC is X2 (i.e., the horizontal distance difference X1 formed between the outer edge of the second portion AUP2 located on the same side of the geometric center GC and the outer edge of the center portion AUC in the second direction D2). The horizontal distance difference between the third part AUP3 and the central part AUC is X3 (i.e., the horizontal distance difference X3 formed between the outer edge of the third part AUP3 located on the same side of the geometric center GC and the outer edge of the central part AUC in the second direction D2), the horizontal distance difference between the fourth part AUP4 and the central part AUC is X4 (i.e., the horizontal distance difference X4 formed between the outer edge of the fourth part AUP4 located on the same side of the geometric center GC and the outer edge of the central part AUC in the second direction D2), and X4>X3>X2>X1. In some embodiments, the viewing angle control device 10 meets the following conditions: W1=WC+2X1, W2=WC+2X2, W3=WC+2X3 and W4=WC+2X4. Each anti-seepage unit AU takes the axis passing through the geometric center GC and extending along the first direction D1 as the symmetry axis, forming an axis-symmetrical structure.

Referring to Figures 1A and 1C, the first substrate 110 further includes a plurality of spacers 140. The spacers 140 are disposed on the first insulating layer 116 and disposed at the intersection between at least two adjacent viewing angle control areas AR, for example, disposed on the insulating layer 116 corresponding to the outermost portion (e.g., the fourth portion AUP4) of the peripheral portion AUP.

In the embodiment shown in FIGS. 1A to 1C, the cross section of the anti-penetration unit AU (i.e., the cross section of the first insulating layer 116) is stepped, that is, the top surfaces of the central portion AUC and the first portion AUP1 to the fourth portion AUP4 are parallel to the planes formed by the second direction D2 and the third direction D3, respectively. According to this embodiment, the anti-penetration unit AU with a stepped cross section (i.e., the first insulating layer 116 with a stepped cross section) can be formed by exposing a transparent photoresist material through a photomask with increasing or decreasing transmittance and a subsequent thermal baking process. However, the present invention is not limited thereto. In other embodiments, the cross section of the anti-penetration unit AU is arc-shaped, as shown in FIG. 2.

Please refer to FIG. 2, which shows a cross-sectional view of a viewing angle control device 20 according to another embodiment of the present invention, corresponding to the plane formed by the first direction D1 and the second direction D2. One of the differences between the viewing angle control device 20 and the viewing angle control device 10 is that the cross-section of the anti-seepage unit AU is arc-shaped, that is, the cross-section of the first insulating layer 216 of the first substrate 210 is arc-shaped, and other repeated parts will not be described in detail. Since the transparent photoresist material used to form the first insulating layer 216 has better fluidity after exposure than the transparent photoresist material used to form the first insulating layer 116, it is still easy to spread and have an arc-shaped profile after the exposure step. Compared with the viewing angle control device 10, since the cross section of the anti-seepage unit AU of the viewing angle control device 20 (i.e., the cross section of the first insulating layer 216) is arc-shaped and does not have a step-shaped turning point close to a vertical angle, the liquid crystal will not bend at the turning point, and there will be less liquid crystal misalignment, which can have better display quality.

In the embodiment of the viewing angle control device 10, the tilt angle formed between the extension direction of the long axis LA of the liquid crystal molecule 132 and the second direction D2 can be about 2 to 8 degrees. In the embodiment of the viewing angle control device 20, the tilt angle formed between the extension direction of the long axis LA of the liquid crystal molecule 132 and the second direction D2 can be between 0 and 40 degrees.

According to some embodiments, the central portion AUC of the anti-penetration unit AU has a geometric shape, preferably, the geometric shape has an axisymmetric outline, and the peripheral portion AUP has a contour that at least partially conforms to the geometric shape of the central portion AUC. For example, in the embodiment shown in FIG. 1A, the central portion AUC of the anti-penetration unit AU is a rectangle, and the outer edges of the first portion AUP1, the second portion AUP2, the third portion AUP3, and the fourth portion AUP4 respectively have rectangular contours. It should be understood that the geometric shape of the central portion AUC of the present invention and the contour of the peripheral portion AUP conforming to the geometric shape of the central portion AUC are not limited to rectangles, but can be circular, triangular, hexagonal or other suitable geometric shapes, as long as the geometric shape conforms to the axisymmetric geometry, it is within the scope of protection of this case. As shown in Figure 3A, the geometry of the central part AUC and the contour of the peripheral part AUP that matches the geometry of the central part AUC are both circular. As shown in Figure 3B, the geometry of the central part AUC and the contour of the peripheral part AUP that matches the geometry of the central part AUC are both triangular.

According to some embodiments, the central portion AUC of the anti-penetration unit AU has a geometric shape, and the peripheral portion AUP has a portion of the contour that conforms to the geometric shape of the central portion AUC and another portion of the contour that does not conform to the geometric shape of the central portion AUC. As shown in FIG. 4, the central portion AUC of the anti-penetration unit AU is circular, the outer edges of the first portion AUP1, the second portion AUP2, and the third portion AUP3 respectively have circular contours, and the outer edge of the fourth portion AUP4 has a rectangular contour.

According to one embodiment, the number of anti-peeping units AU included in each viewing angle control area AR is 1, as shown in FIG. 1A. According to some embodiments, the number of anti-peeping units AU included in each viewing angle control area AR is at least 2, as shown in FIGS. 5A-5B. Referring to FIG. 5A, the number of anti-peeping units AU included in each viewing angle control area AR is 2. Referring to FIG. 5B, the number of anti-peeping units AU included in each viewing angle control area AR is 4.

According to some embodiments, the portion of the anti-penetration unit AU that is closer to the geometric center GC has a smaller projection area, as shown in FIG. 6A. For example, the projection area of the central portion AUC in the anti-penetration unit AU along the first direction D1 projected onto the plane formed by the second direction D2 and the third direction D3 (e.g., the upper surface of the first substrate 110) is A10, the projection area of the first portion AUP1 along the first direction D1 projected onto the plane formed by the second direction D2 and the third direction D3 (e.g., the upper surface of the first substrate 110) is A11, and the projection area of the second portion AUP2 along the first direction D1 projected onto the plane formed by the second direction D2 and the third direction D3 is A12. The projection area on the first substrate 110 (for example, the upper surface of the first substrate 110) is A12, the projection area on the plane formed by the second direction D2 and the third direction D3 (for example, the upper surface of the first substrate 110) along the first direction D1 of the third portion AUP3 is A13, and the projection area on the plane formed by the second direction D2 and the third direction D3 (for example, the upper surface of the first substrate 110) along the fourth portion AUP4 is A14, wherein A10<A11<A12<A13<A14.

In some embodiments, the proportions of different anti-observation angles can be adjusted by adjusting the area ratios of different parts of the anti-observation unit AU (e.g., the central part AUC and the first part AUP1 to the fourth part AUP4). For example, when the area of the central part AUC, the area of the first part AUP1, the area of the second part AUP2, the area of the third part AUP3, and the area of the fourth part AUP4 are the same, the optimal anti-observation angle is evenly distributed between 30 and 60 degrees. When the area of the central part AUC is larger than the area of the first part AUP1, the area of the second part AUP2, the area of the third part AUP3, and the area of the fourth part AUP4, the optimal anti-observation angle tends to be 60 degrees. When the area of the fourth part AUP4 is larger than the area of the first part AUP1, the area of the second part AUP2, the area of the third part AUP3 and the area of the central part AUC, the optimal anti-obstruction angle tends to be 30 degrees.

According to some embodiments, the portion of the anti-penetration unit AU that is closer to the geometric center GC has a larger projection area, as shown in FIG. 6B. For example, the projection area of the central portion AUC in the anti-penetration unit AU along the first direction D1 projected onto the plane formed by the second direction D2 and the third direction D3 (e.g., the upper surface of the first substrate 110) is A20, the projection area of the first portion AUP1 along the first direction D1 projected onto the plane formed by the second direction D2 and the third direction D3 (e.g., the upper surface of the first substrate 110) is A21, and the projection area of the second portion AUP2 along the first direction D1 projected onto the plane formed by the second direction D2 and the third direction D3 is A22. The projection area on the first substrate 110 (for example, the upper surface of the first substrate 110) is A22, the projection area of the third part AUP3 along the first direction D1 on the plane formed by the second direction D2 and the third direction D3 (for example, the upper surface of the first substrate 110) is A23, and the projection area of the fourth part AUP4 along the first direction D1 on the plane formed by the second direction D2 and the third direction D3 (for example, the upper surface of the first substrate 110) is A24, wherein A20>A21>A22>A23>A24.

According to some embodiments, the anti-peeping angle formed by the anti-peeping unit AU in the X-axis or Y-axis direction is between 30 and 60 degrees.

According to some embodiments, the phase delay corresponding to the liquid crystal layer 130 is between 600nm and 1600nm.

According to some embodiments, the first substrate 110 may be a thin film transistor array substrate, and the second substrate 120 may be a transparent substrate. The first insulating layer 116 or 216 may be an organic photosensitive material and may serve as a planar layer.

In summary, although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Those with common knowledge in the technical field to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the patent application attached hereto.

10: View control device

110: First substrate

112: First base plate

114: First electrode

116: First insulation layer

120: Second substrate

122: Second base plate

124: Second electrode

130: Liquid crystal layer

132: Liquid crystal molecules

AR: View control area

AU: Anti-observation unit

AUC: Central part

AUP: Outer part

AUP1: Part 1

AUP2: Part 2

AUP3: Part 3

AUP4: Part 4

D1: First direction

D2: Second direction

D3: Third direction

GC: Geometry Center

HC, H1~H4: thickness

HAC, HP1~HP4: Height

HS:Distance

LA: Long axis

WC, W1~W4: Width

X1~X4: horizontal distance difference

Claims (9)

A viewing angle control device for a display panel includes: a first substrate; a second substrate disposed opposite to the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate; and a plurality of viewing angle control areas disposed on the first substrate and arranged in an array, each viewing angle control area includes at least one pixel structure within a vertical projection range relative to the display panel, and each viewing angle control area includes at least one anti-peeping unit, each anti-peeping unit includes a central part and a peripheral part surrounding the central part, wherein the height from the first substrate to the central part is greater than the height from the first substrate to the peripheral part, and the liquid crystal thickness of the central part corresponding to the second substrate is different from the liquid crystal thickness of the peripheral part corresponding to the second substrate, wherein the cross-section of the at least one anti-peeping unit is stepped or arc-shaped. The viewing angle control device as described in claim 1, wherein the peripheral portion and the first substrate include at least two vertical distances, and the at least two vertical distances decrease from the direction close to the central portion toward the direction away from the central portion. The viewing angle control device as described in claim 1, wherein the peripheral portion includes a first portion and a second portion, the first portion is closer to the central portion than the second portion; wherein the thickness of the liquid crystal layer corresponding to the central portion is HC, the thickness of the liquid crystal layer corresponding to the first portion is H1, and the thickness of the liquid crystal layer corresponding to the second portion is H2; the width of the central portion is WC, the width of the first portion is W1, and the width of the second portion is W2, and the viewing angle control device meets the following conditions: WC

2HC, W1

2H1 and W2

2H2. The viewing angle control device as described in claim 1, wherein the peripheral portion includes a first portion, a second portion, a third portion and a fourth portion, wherein the horizontal distance differences between the first portion, the second portion, the third portion and the fourth portion and the central portion are X1, X2, X3, and X4, respectively, and X4>X3>X2>X1. The viewing angle control device as described in claim 1, wherein the number of the at least one anti-penetration unit included in each viewing angle control area is at least 2. The viewing angle control device as described in claim 1, wherein the central portion of the at least one anti-seepage unit is an axisymmetric geometric shape, and the peripheral portion at least partially has a contour that conforms to the geometric shape. The viewing angle control device as described in claim 1, wherein the first substrate includes a first bottom plate and a first electrode disposed on the first bottom plate; the viewing angle control device further includes a first insulating layer disposed on the first electrode, the first insulating layer forming the at least one anti-seepage unit; the second substrate includes a second bottom plate and a second electrode disposed on the second bottom plate. The viewing angle control device as described in claim 7, wherein the first substrate further includes at least one spacer, the at least one spacer is disposed on the first insulating layer and is disposed at the intersection between at least two adjacent viewing angle control regions. The viewing angle control device as described in claim 1, wherein the peripheral portion has a first portion, a second portion, a third portion and a fourth portion whose heights decrease from the vicinity of the central portion outward, wherein the thickness of the liquid crystal layer corresponding to the central portion is HC, the thickness of the liquid crystal layer corresponding to the first portion is H1, the thickness of the liquid crystal layer corresponding to the second portion is H2, the thickness of the liquid crystal layer corresponding to the third portion is H3, and the thickness of the liquid crystal layer corresponding to the fourth portion is H4, wherein HC<H1<H2<H3<H4.

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