Viewing angle switching module and display device

Abstract

The present application provides a kind of view angle switching module, including first view angle controller, second view angle controller, first polaroid and second polaroid.First view angle controller includes first alignment layer, second alignment layer and first liquid crystal layer.The first alignment direction of first alignment layer is reverse parallel to the second alignment direction of second alignment layer.Second view angle controller is overlapped with first view angle controller, and includes third alignment layer, fourth alignment layer and second liquid crystal layer.The third alignment direction of third alignment layer is reverse parallel to the fourth alignment direction of fourth alignment layer.First polaroid is arranged in one side of first view angle controller, and the axial direction of its first absorption axis is perpendicular to or parallel to first alignment direction and second alignment direction.Second polaroid is arranged in one side of second view angle controller, and the axial direction of its second absorption axis is perpendicular to or parallel to third alignment direction and fourth alignment direction.A kind of display device using view angle switching module is also proposed.

Description

Technical Field

[0001] This invention relates to a display technology with switchable viewing angles, and more particularly to a viewing angle switching module and display device. Background Technology

[0002] Generally, display devices are designed for wide viewing angles to allow multiple viewers to watch simultaneously. However, in certain situations or occasions, such as browsing private websites, displaying confidential information, or entering passwords in public, wide viewing angles can make the screen vulnerable to peeping and leaks of confidential information. To achieve privacy protection, a common practice is to place a privacy screen in front of the display panel to filter out wide-angle light. However, this sacrifices the overall brightness and display quality of the panel. Conversely, when privacy protection is not needed, the light control film can be manually removed from the display panel. In other words, while such privacy screens offer privacy protection, their ease of use and the quality of privacy-protected display still have room for improvement. Therefore, developing a display device that offers both convenient viewing angle switching and excellent privacy protection has become a crucial issue for manufacturers. Summary of the Invention

[0003] This invention relates to a perspective switching module, which has better perspective switching effect and light energy utilization.

[0004] This invention relates to a display device that offers superior privacy protection and ease of switching.

[0005] According to an embodiment of the present invention, the viewing angle switching module includes a first viewing angle controller, a second viewing angle controller, a first polarizer, and a second polarizer. The first viewing angle controller includes a first alignment layer, a second alignment layer, and a first liquid crystal layer. The first alignment layer has a first alignment direction. The second alignment layer has a second alignment direction. The first alignment direction is parallel to the second alignment direction. The first liquid crystal layer is sandwiched between the first alignment layer and the second alignment layer. The second viewing angle controller overlaps with the first viewing angle controller and includes a third alignment layer, a fourth alignment layer, and a second liquid crystal layer. The third alignment layer has a third alignment direction. The fourth alignment layer has a fourth alignment direction. The third alignment direction is parallel to the fourth alignment direction. The second liquid crystal layer is sandwiched between the third alignment layer and the fourth alignment layer. The first polarizer is disposed on one side of the first viewing angle controller and has a first absorption axis. The first and second alignment directions are perpendicular to or parallel to the axial direction of the first absorption axis. The second polarizer is disposed on one side of the second viewing angle controller and has a second absorption axis. The third and fourth alignment directions are perpendicular to or parallel to the axial direction of the second absorption axis.

[0006] In the viewing angle switching module according to an embodiment of the present invention, the first viewing angle controller and the second viewing angle controller are located between the first polarizer and the second polarizer, and the axial direction of the first absorption axis is perpendicular to the axial direction of the second absorption axis.

[0007] In the viewing angle switching module according to an embodiment of the present invention, a first viewing angle controller is located between a first polarizer and a second polarizer. A second polarizer is located between the first viewing angle controller and the second viewing angle controller, and the axial direction of the first absorption axis is parallel to the axial direction of the second absorption axis.

[0008] In the perspective switching module according to an embodiment of the present invention, the axial direction of the first absorption axis is parallel to the axial direction of the second absorption axis. The first alignment direction and the second alignment direction are perpendicular to the axial direction of the first absorption axis, and the third alignment direction and the fourth alignment direction are parallel to the axial direction of the second absorption axis.

[0009] In the perspective switching module according to an embodiment of the present invention, the first alignment direction is parallel to the third alignment direction, and the second alignment direction is parallel to the fourth alignment direction.

[0010] According to an embodiment of the present invention, a display device includes a display panel and a viewing angle switching module disposed overlapping each other. The viewing angle switching module includes a first viewing angle controller, a second viewing angle controller, a first polarizer, a second polarizer, and a third polarizer. The first viewing angle controller includes a first alignment layer, a second alignment layer, and a first liquid crystal layer. The first alignment layer and the second alignment layer each have a first alignment direction and a second alignment direction. The first alignment direction is opposite to and parallel to the second alignment direction. The first liquid crystal layer is sandwiched between the first alignment layer and the second alignment layer. The second viewing angle controller overlaps with the first viewing angle controller and includes a third alignment layer, a fourth alignment layer, and the second liquid crystal layer. The third alignment layer and the fourth alignment layer each have a third alignment direction and a fourth alignment direction. The third alignment direction is opposite to and parallel to the fourth alignment direction. The second liquid crystal layer is sandwiched between the third alignment layer and the fourth alignment layer. The first polarizer is disposed on the side of the first viewing angle controller away from the display panel and has a first absorption axis. The first alignment direction and the second alignment direction are perpendicular to or parallel to the axial direction of the first absorption axis. The second polarizer is disposed between the display panel and the viewing angle switching module and has a second absorption axis. The first absorption axis is parallel to the second absorption axis. A third polarizer is disposed on one side of the second viewing angle controller and has a third absorption axis. The third alignment direction and the fourth alignment direction are perpendicular to or parallel to the axis of the third absorption axis.

[0011] In a display device according to an embodiment of the present invention, a display panel is disposed between a first viewing angle controller and a second viewing angle controller. The first viewing angle controller and the second viewing angle controller are located between a first polarizer and a third polarizer, and the axial direction of the first absorption axis is perpendicular to the axial direction of the third absorption axis.

[0012] In a display device according to an embodiment of the present invention, a fourth polarizer is provided between a second viewing angle controller and a display panel. The fourth polarizer has a fourth absorption axis, and the axial direction of the fourth absorption axis is parallel to the axial direction of the third absorption axis.

[0013] In a display device according to an embodiment of the present invention, a first viewing angle controller is located between a second viewing angle controller and a display panel. A first polarizer is located between the first viewing angle controller and the second viewing angle controller. A second polarizer is located between the display panel and the first viewing angle controller. A third polarizer is located on the side of the second viewing angle controller away from the first viewing angle controller, and the axial direction of the first absorption axis is parallel to the axial direction of the second absorption axis and the axial direction of the third absorption axis.

[0014] In a display device according to an embodiment of the present invention, a fourth polarizer is provided on the side of the display panel away from the first viewing angle controller and the second viewing angle controller. The fourth polarizer has a fourth absorption axis, and the axial direction of the fourth absorption axis is perpendicular to the axial direction of the second absorption axis.

[0015] In a display device according to an embodiment of the present invention, the axial direction of the first absorption shaft is parallel to the axial direction of the third absorption shaft. The first alignment direction and the second alignment direction are perpendicular to the axial direction of the first absorption shaft, and the third alignment direction and the fourth alignment direction are parallel to the axial direction of the third absorption shaft.

[0016] In a display device according to an embodiment of the present invention, the first alignment direction is parallel to the third alignment direction, and the second alignment direction is parallel to the fourth alignment direction.

[0017] Based on the above, in a display device according to an embodiment of the present invention, the viewing angle switching module includes two viewing angle controllers. Each viewing angle controller arranges liquid crystal layers with two alignment layers whose alignment directions are parallel to each other and opposite to each other. The alignment directions of the two liquid crystal layers of the two viewing angle controllers can be perpendicular or parallel to each other. By overlapping the two viewing angle controllers, in addition to maintaining the overall brightness near the normal viewing angle of the display panel, the privacy protection effect of traditional privacy screens can be achieved, and the convenience of switching the privacy protection function can also be improved. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of a display device according to a first embodiment of the present invention;

[0019] Figure 2A yes Figure 1 A top view schematic diagram of the axial relationship of some film layers in a display device;

[0020] Figure 2B yes Figure 1 A top view schematic diagram of the axial relationship of some film layers in a display device of another modified embodiment;

[0021] Figure 3A yes Figure 2A A brightness distribution diagram of a display device operating in privacy mode;

[0022] Figure 3B yes Figure 2B A brightness distribution diagram of a display device operating in privacy mode;

[0023] Figure 4 This is a cross-sectional schematic diagram of a display device according to a second embodiment of the present invention;

[0024] Figure 5 yes Figure 4 A top view schematic diagram of the axial relationship of some film layers in a display device;

[0025] Figure 6 yes Figure 4 A brightness distribution diagram of a display device operating in privacy mode;

[0026] Figure 7 This is a cross-sectional schematic diagram of a display device according to a third embodiment of the present invention;

[0027] Figure 8 yes Figure 7 A top view schematic diagram of the axial relationship of some film layers in a display device;

[0028] Figure 9 yes Figure 7 A brightness distribution diagram of a display device operating in privacy mode;

[0029] Figure 10 This is a cross-sectional schematic diagram of a display device according to a fourth embodiment of the present invention;

[0030] Figure 11 This is a cross-sectional schematic diagram of a display device according to the fifth embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] 10, 20, 20A, 30, 40: Display devices;

[0033] 100, 100A, 100B, 100C, 100D: Viewpoint switching module;

[0034] 110, 120, 120A: Viewpoint controller;

[0035] 200: Display panel;

[0036] AD1: First alignment direction;

[0037] AD2: Second alignment direction;

[0038] AD3: Third alignment direction;

[0039] AD4: Fourth alignment direction;

[0040] AL1: First alignment layer;

[0041] AL2: Second alignment layer;

[0042] AL3, AL3-A: Third alignment layer;

[0043] AL4, AL4-A: Fourth alignment layer;

[0044] AX1, AX2, AX3, AX4, AX3”, AX4”: Absorption axes;

[0045] EL1: First electrode layer;

[0046] EL2: Second electrode layer;

[0047] EL3: Third electrode layer;

[0048] EL4: Fourth electrode layer;

[0049] LCL1: First liquid crystal layer;

[0050] LCL2: Second liquid crystal layer;

[0051] POL1, POL2, POL3, POL4, POL3”, POL4”: Polarizing film;

[0052] SUB1: First substrate;

[0053] SUB2: Second substrate;

[0054] SUB3: Third substrate;

[0055] SUB4: Fourth substrate;

[0056] X, Y, Z: Direction. Detailed Implementation

[0057] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element references are used in the drawings and description to denote the same or similar parts.

[0058] Figure 1 This is a cross-sectional schematic diagram of a display device according to a first embodiment of the present invention. Figure 2A yes Figure 1 A top view schematic diagram of the axial relationship of some film layers in a display device. Figure 2B yes Figure 1 A top view schematic diagram of the axial relationship of a portion of the film layers of a display device in another modified embodiment. Figure 3A yes Figure 2A Brightness distribution diagram of the display device operating in privacy mode. Figure 3B yes Figure 2B Brightness distribution diagram of the display device operating in privacy mode.

[0059] Please refer to Figure 1 and Figure 2A The display device 10 includes a viewing angle switching module 100 and a display panel 200 that are overlapped along the Z direction. In this embodiment, the display panel 200 may be a non-self-emissive display panel, such as a liquid crystal display panel. Therefore, the display device 10 may also include a backlight module (not shown) to provide the necessary illumination source for the display panel 200. In addition, polarizers POL1 and POL2 may be respectively provided on opposite sides of the display panel 200, so that the display panel 200 can effectively exert its light modulation performance, wherein the polarizer POL2 is located between the viewing angle switching module 100 and the display panel 200. In this embodiment, the axial direction of the absorption axis AX1 of the polarizer POL1 may be selectively perpendicular to the axial direction of the absorption axis AX2 of the polarizer POL2, but is not limited thereto.

[0060] It should be noted that, in other embodiments not shown, the display panel 200 may also be a self-emissive display panel, such as an organic light emitting diode (OLED) display panel, a micro light emitting diode (micro-LED) display panel, or a mini-light emitting diode (mini-LED) display panel.

[0061] The viewing angle switching module 100 includes a viewing angle controller 110. The viewing angle controller 110 includes a first substrate SUB1, a second substrate SUB2, a first liquid crystal layer LCL1, a first alignment layer AL1, a second alignment layer AL2, a first electrode layer EL1, and a second electrode layer EL2. The materials of the first substrate SUB1 and the second substrate SUB2 may include glass, quartz, polymer, or other suitable light-transmitting materials. The first liquid crystal layer LCL1 is disposed between the first substrate SUB1 and the second substrate SUB2. The first alignment layer AL1 is disposed between the first liquid crystal layer LCL1 and the first substrate SUB1. The second alignment layer AL2 is disposed between the first liquid crystal layer LCL1 and the second substrate SUB2. The first alignment layer AL1 and the second alignment layer AL2 are used to align the first liquid crystal layer LCL1 and have a first alignment direction AD1 and a second alignment direction AD2, respectively. The first alignment direction AD1 is anti-parallel to the second alignment direction AD2. In this embodiment, the first alignment direction AD1 is, for example, the opposite direction of direction Y, while the second alignment direction AD2 is, for example, the direction Y (e.g., Figure 2A (As shown).

[0062] It should be noted that the viewing angle switching module 100 enables the display device 10 to have a privacy protection function. The alignment directions of the first alignment layer AL1 and the second alignment layer AL2 of the viewing angle controller 110 define the viewing angle switching direction (i.e., the privacy protection direction) of the display device 10. This viewing angle switching direction is approximately perpendicular to the alignment directions of the first alignment layer AL1 and the second alignment layer AL2, for example... Figure 2A The direction is X. In this embodiment, the display device 10 can switch between a non-peeping mode and a peeping mode depending on whether the viewing angle controller 110 is enabled or not. For example, when the viewing angle controller 110 is enabled, the display device 10 operates in the peeping mode; conversely, when the viewing angle controller 110 is disabled, the display device 10 operates in the non-peeping mode, but this is not a limitation.

[0063] A first electrode layer EL1 is disposed between a first substrate SUB1 and a first alignment layer AL1. A second electrode layer EL2 is disposed between a second substrate SUB2 and a second alignment layer AL2. For example, in this embodiment, the first electrode layer EL1 and the second electrode layer EL2 can be a solid electrode or a patterned electrode, and the present invention is not limited thereto. The first electrode layer EL1 and the second electrode layer EL2 are, for example, light-transmitting electrodes, and the material of the light-transmitting electrodes may include metal oxides, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxides, or a stacked layer of at least two of the above.

[0064] When the viewing angle controller 110 is enabled, the first electrode layer EL1 and the second electrode layer EL2 are respectively applied with different potentials to form an electric field between the two electrode layers to drive the liquid crystal molecules (not shown) of the first liquid crystal layer LCL1 to rotate. That is, the viewing angle controller 110 in this embodiment is an electrically controlled liquid crystal cell.

[0065] In this embodiment, the viewing angle switching module 100 further includes a polarizer POL3, disposed on the side of the viewing angle controller 110 opposite to the display panel 200. It is particularly noteworthy that the axial direction of the absorption axis AX3 of the polarizer POL3 is parallel to the axial direction of the absorption axis AX2 of the polarizer POL2 disposed adjacent to the other side of the viewing angle controller 110, and perpendicular to the alignment directions of the first alignment layer AL1 and the second alignment layer AL2. That is, in this embodiment, the axial directions of the absorption axes of polarizers POL2 and POL3 are respectively disposed in direction X, but this is not a limitation. In another modified embodiment, the axial directions of the absorption axes of polarizers POL2 and POL3 may also be parallel to the alignment directions of the first alignment layer AL1 and the second alignment layer AL2 (e.g., ...). Figure 2B (As shown).

[0066] Please refer to the following at the same time Figure 3A When the viewing angle controller 110 is enabled, the display device 10 in Figure 3A The display device 10 can have privacy protection in the horizontal dimension (i.e., azimuth angles of 0 degrees and 180 degrees). For example, the light emission brightness of the display device 10 can be significantly suppressed within a side viewing angle range of 40 to 60 degrees. It is particularly noteworthy that the display device 10... Figure 3A It has no privacy protection in the vertical dimensions (i.e., the 90-degree and 270-degree azimuth angles). Figure 2B In the modified embodiment, although the axial directions of the absorption axes AX2 and AX3 of the two polarizers are parallel to the alignment directions of the two alignment layers of the viewing angle switching module, the display device can still produce a privacy protection effect similar to that of this embodiment, such as... Figure 3B As shown.

[0067] By setting the viewing angle switching module 100, the display device 10 can not only achieve the privacy protection effect of a traditional privacy screen, but also avoid the reduction in light output brightness of the display panel 200 due to the setting of the current privacy screen. In addition, the electrically controllable switching feature of the viewing angle controller 110 can also improve the convenience of switching between non-privacy mode and privacy mode of the display device 10.

[0068] Other embodiments will be listed below to illustrate this disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the foregoing embodiments, and they will not be repeated below.

[0069] Figure 4This is a cross-sectional schematic diagram of a display device according to a second embodiment of the present invention. Figure 5 yes Figure 4 A top view schematic diagram of the axial relationship of some film layers in a display device. Figure 6 yes Figure 4 Brightness distribution diagram of the display device operating in privacy mode.

[0070] Please refer to Figure 4 and Figure 5 The display device 20 in this embodiment and Figure 1 The main difference between the display device 10 and the display device 20 lies in the number of view controllers in the view switching module. Specifically, in order to make the privacy protection effect of the display device 20 comparable to that of the display device 20, the display device 20 is designed to be more privacy-protected than the display device 20. Figure 1 The display device 10 is further improved, and the viewing angle switching module 100A of the display device 20 also includes another viewing angle controller 120. In this embodiment, the viewing angle controller 120 is arranged to overlap with the viewing angle controller 110 along the Z direction, and is located on the side of the viewing angle controller 110 away from the display panel 200.

[0071] Similar to the viewing angle controller 110, the viewing angle controller 120 may include a third substrate SUB3, a fourth substrate SUB4, a second liquid crystal layer LCL2, a third alignment layer AL3, a fourth alignment layer AL4, a third electrode layer EL3, and a fourth electrode layer EL4. The materials of the third substrate SUB3 and the fourth substrate SUB4 may include glass, quartz, a polymer, or other suitable light-transmitting materials. The second liquid crystal layer LCL2 is disposed between the third substrate SUB3 and the fourth substrate SUB4. The third alignment layer AL3 is disposed between the second liquid crystal layer LCL2 and the third substrate SUB3. The fourth alignment layer AL4 is disposed between the second liquid crystal layer LCL2 and the fourth substrate SUB4. The third alignment layer AL3 and the fourth alignment layer AL4 are used to align the second liquid crystal layer LCL2, and each has a third alignment direction AD3 and a fourth alignment direction AD4, respectively. The third alignment direction AD3 is anti-parallel to the fourth alignment direction AD4. In this embodiment, the third alignment direction AD3 is, for example, the opposite direction of direction Y, while the fourth alignment direction AD4 is, for example, the direction Y (e.g., Figure 5 (As shown).

[0072] In this embodiment, the third alignment direction AD3 of the third alignment layer AL3 and the fourth alignment direction AD4 of the fourth alignment layer AL4 of the viewing angle controller 120 are parallel to the first alignment direction AD1 of the first alignment layer AL1 and the second alignment direction AD2 of the second alignment layer AL2 of the viewing angle controller 110, and are perpendicular to the axial direction of the absorption axis of the polarizer POL2 and polarizer POL3, respectively. For example, the first alignment direction AD1 may be parallel to the third alignment direction AD3, and the second alignment direction AD2 may be parallel to the fourth alignment direction AD4, but this is not a limitation.

[0073] The third electrode layer EL3 is disposed between the third substrate SUB3 and the third alignment layer AL3. The fourth electrode layer EL4 is disposed between the fourth substrate SUB4 and the fourth alignment layer AL4. For example, in this embodiment, the third electrode layer EL3 and the fourth electrode layer EL4 can be solid electrodes or patterned electrodes, and the present invention is not limited thereto. The third electrode layer EL3 and the fourth electrode layer EL4 are, for example, light-transmitting electrodes, and the material of the light-transmitting electrodes may include metal oxides, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxides, or a stacked layer of at least two of the above.

[0074] When the viewing angle controller 120 is enabled, the third electrode layer EL3 and the fourth electrode layer EL4 are respectively applied with different potentials to form an electric field between the two electrode layers to drive the liquid crystal molecules (not shown) of the second liquid crystal layer LCL2 to rotate. That is to say, the viewing angle controller 120 in this embodiment is an electrically controlled liquid crystal cell.

[0075] In this embodiment, the viewing angle switching module 100A of the display device 20 further includes a polarizer POL4, which is disposed on the side of the viewing angle controller 120 opposite to the viewing angle controller 110. It is particularly noteworthy that the absorption axis AX4 of the polarizer POL4 is parallel to the absorption axis AX3 of the polarizer POL3 adjacent to the other side of the viewing angle controller 120, and perpendicular to the alignment directions of the third alignment layer AL3 and the fourth alignment layer AL4. That is, in this embodiment, the absorption axes of the polarizers POL2, POL3, and POL4 are respectively disposed in direction X, but this is not a limitation.

[0076] Please refer to the following at the same time Figure 6 When the display device 20 is operating in privacy mode, both the viewing angle controller 110 and the viewing angle controller 120 can be enabled, allowing the display device 20 to... Figure 6 This creates a privacy protection effect in the horizontal dimension (i.e., azimuth angles of 0 degrees and 180 degrees). For example, within a side viewing angle range of 30 to 60 degrees, the light output brightness of the display device 20 is compared to... Figure 1 The display device 10 can be suppressed more significantly.

[0077] It is particularly noteworthy that, in this embodiment, since two viewing angle controllers are superimposed on the display panel 200, when both viewing angle controllers are enabled, the display device 20 can also produce an effective privacy protection effect in adjacent orientations deviating from azimuth angles of 0 degrees and 180 degrees. That is, compared to... Figure 1 The privacy protection range of the display device 20 in this embodiment can be further expanded.

[0078] It should be understood that when the display device 20 is operating in privacy mode, only one of the viewing angle controller 110 and the viewing angle controller 120 may be enabled, causing the display device 20 to generate a privacy mode. Figure 1 The display device 10 has a considerable privacy protection effect.

[0079] Figure 7 This is a cross-sectional schematic diagram of a display device according to a third embodiment of the present invention. Figure 8 yes Figure 7 A top view schematic diagram of the axial relationship of some film layers in a display device. Figure 9 yes Figure 7 The brightness distribution diagram of the display device operating in privacy mode. Please refer to... Figure 7 and Figure 8 The display device 20A in this embodiment and Figure 4 The difference between the display device 20 and the display device 20 is that the alignment direction of the alignment layer of the viewing angle controller 120A is different from the alignment direction of the alignment layer of the viewing angle controller 120.

[0080] In this embodiment, the third alignment direction AD3 of the third alignment layer AL3-A and the fourth alignment direction AD4 of the fourth alignment layer AL4-A of the viewpoint controller 120A of the viewpoint switching module 100B are perpendicular to the first alignment direction AD1 of the first alignment layer AL1 and the second alignment direction AD2 of the second alignment layer AL2 of the viewpoint controller 110, and parallel to the axial direction of the absorption axis of each polarizer POL2, polarizer POL3 and polarizer POL4. In this embodiment, the third alignment direction AD3 is, for example, the opposite of direction X, while the fourth alignment direction AD4 is, for example, direction X (e.g., ...). Figure 8 (As shown).

[0081] Please refer to the following at the same time Figure 9 Since the alignment directions of the two alignment layers of the viewing angle controller 120A are approximately perpendicular to the alignment directions of the two alignment layers of the viewing angle controller 110, the display device 20A... Figure 9The privacy protection effect can also be achieved in the vertical dimension (i.e., azimuth angles of 90 degrees and 270 degrees). In other words, the display device 20A of this embodiment has the ability to switch viewing angles simultaneously in both the horizontal and vertical dimensions. Therefore, the display device 20A can have more flexible operating modes. For example, the display device 20A can operate in three privacy protection modes: when the viewing angle controller 110 is enabled and the viewing angle controller 120A is not enabled, the display device 20A only has a privacy protection effect in the horizontal dimension; when the viewing angle controller 120A is enabled and the viewing angle controller 110 is not enabled, the display device 20A only has a privacy protection effect in the vertical dimension; when both viewing angle controllers are enabled, the display device 20A has a privacy protection effect in both the horizontal and vertical dimensions simultaneously.

[0082] Figure 10 This is a cross-sectional schematic diagram of a display device according to a fourth embodiment of the present invention. Please refer to... Figure 10 The display device 30 in this embodiment and Figure 4 The main difference between the display device 20 and the other device 30 lies in the stacking order of the display panel and the viewing angle controller. In this embodiment, the display panel 200 of the display device 30 is disposed between the viewing angle controller 110 and the viewing angle controller 120 of the viewing angle switching module 100C, and the polarizer POL3” is disposed on the side of the viewing angle controller 110 away from the display panel 200. It is particularly noteworthy that the axial direction of the absorption axis AX3” of the polarizer POL3” is parallel to the axial direction of the absorption axis AX1 of the polarizer POL1 disposed on the other side of the viewing angle controller 110. Since the privacy protection effect produced by the viewing angle switching module 100C on the display panel 200 in this embodiment is similar to that of the other device 30, the display panel 200 is disposed between the other device 300 and the other device 400C. Figure 4 The display device 20 of the embodiment is described in detail in the relevant paragraphs of the foregoing embodiment, and will not be repeated here.

[0083] Figure 11 This is a cross-sectional schematic diagram of a display device according to the fifth embodiment of the present invention. Please refer to... Figure 11 The display device 40 in this embodiment and Figure 10The difference between the display device 30 and the previous one lies in the stacking order of the display panel and the viewing angle controller. In this embodiment, the display panel 200 of the display device 40 is disposed above the viewing angle switching module 100D, wherein the viewing angle controller 120 is located between the display panel 200 and the viewing angle controller 110, and the polarizer POL4” is disposed between the viewing angle controller 110 and the viewing angle controller 120. It is particularly noteworthy that the axial direction of the absorption axis AX4” of the polarizer POL4” is parallel to the axial direction of the absorption axis AX1 of the polarizer POL1 and the axial direction of the absorption axis AX3” of the polarizer POL3”, but perpendicular to the axial direction of the absorption axis AX2 of the polarizer POL2. Since the privacy protection effect produced by the viewing angle switching module 100D on the display panel 200 in this embodiment is similar to that of the previous one, the current one is not suitable for viewing angle switching modules. Figure 4 The display device 20 of the embodiment is described in detail in the relevant paragraphs of the foregoing embodiment, and will not be repeated here.

[0084] In summary, in a display device according to an embodiment of the present invention, the viewing angle switching module includes two viewing angle controllers. Each viewing angle controller arranges liquid crystal layers with two alignment layers whose alignment directions are parallel to each other and opposite to each other. The alignment directions of the two liquid crystal layers of the two viewing angle controllers can be perpendicular or parallel to each other. By overlapping these two viewing angle controllers, in addition to maintaining the overall brightness near the normal viewing angle of the display panel, the privacy protection effect of a traditional privacy screen can be achieved, and the convenience of switching the privacy protection function can also be improved.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A perspective switching module, characterized in that, include: First-person view controller, including: A first alignment layer and a second alignment layer, each having a first alignment direction and a second alignment direction, wherein the first alignment direction is opposite to and parallel to the second alignment direction; and A first liquid crystal layer is sandwiched between the first alignment layer and the second alignment layer; A second-view controller, overlapping the first-view controller, includes: The third alignment layer and the fourth alignment layer each have a third alignment direction and a fourth alignment direction, wherein the third alignment direction is opposite to and parallel to the fourth alignment direction; and The second liquid crystal layer is sandwiched between the third alignment layer and the fourth alignment layer; A first polarizer, disposed on one side of the first viewing angle controller, and having a first absorption axis, wherein the first alignment direction and the second alignment direction are perpendicular to the axial direction of the first absorption axis; and A second polarizer is disposed on one side of the second viewing angle controller and has a second absorption axis, wherein the third alignment direction and the fourth alignment direction are perpendicular to the axial direction of the second absorption axis; The first view controller is located between the first polarizer and the second polarizer, and the second polarizer is located between the first view controller and the second view controller. The axial direction of the first absorption axis is parallel to the axial direction of the second absorption axis, and the first alignment direction is parallel to the third alignment direction. When only one of the first view controller and the second view controller is enabled, the view switching module produces an anti-spy effect within the first side view range in the horizontal dimension. When both the first view controller and the second view controller are enabled, the view switching module produces an anti-spy effect within the second side view range in the horizontal dimension, and the second side view range is larger than the first side view range.

2. A display device, characterized in that, include: Display panel; as well as A perspective switching module, overlapping the display panel, includes: First-person view controller, including: A first alignment layer and a second alignment layer, each having a first alignment direction and a second alignment direction, wherein the first alignment direction is opposite to and parallel to the second alignment direction; and A first liquid crystal layer is sandwiched between the first alignment layer and the second alignment layer; A second-view controller, overlapping the first-view controller, includes: The third alignment layer and the fourth alignment layer each have a third alignment direction and a fourth alignment direction, wherein the third alignment direction is opposite to and parallel to the fourth alignment direction; and The second liquid crystal layer is sandwiched between the third alignment layer and the fourth alignment layer; A first polarizer is disposed on the side of the first viewing angle controller away from the display panel and has a first absorption axis, wherein the first alignment direction and the second alignment direction are perpendicular to the axial direction of the first absorption axis; A second polarizer is disposed between the display panel and the viewing angle switching module, and has a second absorption axis, wherein the axial direction of the first absorption axis is parallel to the axial direction of the second absorption axis; and A third polarizer is disposed on one side of the second viewing angle controller and has a third absorption axis, wherein the third alignment direction and the fourth alignment direction are perpendicular to the axial direction of the third absorption axis. The first viewing angle controller is located between the second viewing angle controller and the display panel. The first polarizer is located between the first viewing angle controller and the second viewing angle controller. The second polarizer is located between the display panel and the first viewing angle controller. The third polarizer is located on the side of the second viewing angle controller away from the first viewing angle controller. The axial direction of the first absorption axis is parallel to the axial direction of the second absorption axis and the axial direction of the third absorption axis. The first alignment direction is parallel to the third alignment direction. When only one of the first viewing angle controller and the second viewing angle controller is enabled, the display device produces a privacy protection effect within a first side viewing angle range in the horizontal dimension. When both the first viewing angle controller and the second viewing angle controller are enabled, the display device produces a privacy protection effect within a second side viewing angle range in the horizontal dimension, and the second side viewing angle range is larger than the first side viewing angle range.

3. The display device according to claim 2, characterized in that, The display panel has a fourth polarizer on the side away from the first viewing angle controller and the second viewing angle controller. The fourth polarizer has a fourth absorption axis, and the axial direction of the fourth absorption axis is perpendicular to the axial direction of the second absorption axis.

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