Display device with multi-view mode switchable and control method

Abstract

The application discloses a display device and a control method with a multi-view mode switchable display panel, which comprises a light adjusting box and a display box stacked with the light adjusting box; the light adjusting box comprises a first substrate, a second substrate and a first liquid crystal layer, the first substrate is provided with a first view angle control electrode, and the second substrate is provided with a second view angle control electrode; the first substrate is provided with a first polaroid and a first quarter-wave plate, the second substrate is provided with a second polaroid and a second quarter-wave plate, the light transmission axis of the first polaroid is perpendicular to the light transmission axis of the second polaroid, the light transmission axis of the first polaroid is at an angle of 45 degrees with the fast axis of the first quarter-wave plate, and the light transmission axis of the second polaroid is at an angle of 45 degrees with the fast axis of the second quarter-wave plate. The first liquid crystal layer is controlled to deflect at different angles in the vertical direction through the first view angle control electrode and the second view angle control electrode, so that multi-directional view angle switching among the first wide view angle mode, the one-way narrow view angle mode and the second wide view angle mode is realized.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display device and control method with switchable multi-view mode. Background Technology

[0002] With the continuous advancement of LCD technology, the viewing angle of monitors has been widened from about 120° to over 160°. While enjoying the visual experience brought by the wide viewing angle, people also hope to effectively protect trade secrets and personal privacy to avoid business losses or embarrassment caused by the leakage of screen information.

[0003] Modern display devices are increasingly moving towards wider viewing angles. Whether it's mobile phone applications, desktop monitors, or laptops, while people enjoy the visual experience brought by wide viewing angles, they also want to avoid being able to see the displayed content from all angles in some application scenarios. In such cases, the monitor needs to switch to a narrow viewing angle. In many situations, the display device also needs to have the function of switching between wide and narrow viewing angles.

[0004] Currently, the main method for switching between wide and narrow viewing angles is to attach a Venetian blind film to the display screen. When privacy is required, the screen is covered with the blind film to narrow the viewing angle. However, this method requires additional blind films, causing significant inconvenience to users. Furthermore, a single blind film can only provide one viewing angle; once attached, the viewing angle is fixed in the narrow viewing angle mode. Additionally, while this method can achieve narrow viewing angles in symmetrical directions (such as left-right or up-down), it cannot achieve narrow viewing angles in a single direction (i.e., left, right, up, or down). For electronic products such as mobile phones, it cannot meet users' needs for narrow viewing angles in a single direction such as left, right, up, or down. For example, in in-vehicle display systems, while the driver is driving, they should avoid seeing display content unrelated to driving, while the passenger can view normally to avoid affecting driving safety. Therefore, current display devices are not suitable for special application scenarios such as in-vehicle displays. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a display device and control method with switchable multi-view mode, so as to solve the problem that the existing technology cannot achieve a narrow viewing angle in a single direction.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] The present invention provides a display device with a multi-view mode switchable, including a dimming box and a display box stacked with the dimming box;

[0008] The dimming box includes a first substrate, a second substrate disposed opposite to the first substrate, and a first liquid crystal layer disposed between the first substrate and the second substrate. The first substrate has a first viewing angle control electrode on the side facing the first liquid crystal layer, and the second substrate has a second viewing angle control electrode cooperating with the first viewing angle control electrode on the side facing the first liquid crystal layer.

[0009] The first substrate has a first polarizer and a first quarter-wave plate, with the first polarizer located on the side of the first quarter-wave plate away from the first liquid crystal layer. The second substrate has a second polarizer and a second quarter-wave plate, with the second polarizer located on the side of the second quarter-wave plate away from the first liquid crystal layer. The transmission axis of the first polarizer and the transmission axis of the second polarizer are perpendicular to each other. The transmission axis of the first polarizer is at a 45° angle to the fast axis of the first quarter-wave plate, and the transmission axis of the second polarizer is at a 45° angle to the fast axis of the second quarter-wave plate.

[0010] Furthermore, the first polarizer and the first quarter-wave plate are both located on the side of the first substrate away from the first liquid crystal layer; the second polarizer and the second quarter-wave plate are both located on the side of the second substrate away from the first liquid crystal layer.

[0011] Furthermore, the fast axis of the first quarter-wave plate is parallel to the fast axis of the second quarter-wave plate.

[0012] Furthermore, the first liquid crystal layer consists of positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules in the first liquid crystal layer are in a flat position, and the alignment direction of the first liquid crystal layer is at 45° to the transmission axis of the second polarizer.

[0013] Furthermore, the first liquid crystal layer consists of negative liquid crystal molecules. In the initial state, the negative liquid crystal molecules in the first liquid crystal layer are in a vertical position and perpendicular to the first substrate and the second substrate.

[0014] Furthermore, at least one of the first viewing angle control electrode and the second viewing angle control electrode has an insulating layer on the side facing the first liquid crystal layer.

[0015] Furthermore, the display cell includes a color filter substrate, an array substrate disposed opposite to the color filter substrate, and a second liquid crystal layer disposed between the color filter substrate and the array substrate; a third polarizer is provided on the side of the display cell away from the dimming box, and the light transmission axis of the polarizer closest to the display cell among the first polarizer and the second polarizer is perpendicular to the light transmission axis of the third polarizer.

[0016] This application also provides a control method for controlling a multi-view mode switchable display device as described above, the control method comprising:

[0017] In the first wide viewing angle mode, corresponding first wide viewing angle voltages are applied to the first viewing angle control electrode and the second viewing angle control electrode respectively to control the liquid crystal molecules in the first liquid crystal layer to be in a vertical posture and perpendicular to the first substrate and the second substrate.

[0018] In the unidirectional narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode and the second viewing angle control electrode respectively, controlling the liquid crystal molecules in the first liquid crystal layer to be in a first tilted posture and have a first tilt angle with the second substrate.

[0019] In the second wide viewing angle mode, corresponding second wide viewing angle voltages are applied to the first viewing angle control electrode and the second viewing angle control electrode respectively, controlling the liquid crystal molecules in the first liquid crystal layer to be in a second tilted posture and have a second tilt angle with the second substrate, wherein the first tilt angle is greater than the second tilt angle.

[0020] Furthermore, the first liquid crystal layer consists of positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules in the first liquid crystal layer are in a flat position, and the alignment direction of the first liquid crystal layer is at 45° to the transmission axis of the second polarizer. The control method includes:

[0021] In the first wide viewing angle mode, a common voltage is applied to the first viewing angle control electrode, and a first voltage is applied to the second viewing angle control electrode. The first voltage is greater than a first preset value to drive the positive liquid crystal molecules in the first liquid crystal layer to be in a vertical posture and perpendicular to the first substrate and the second substrate.

[0022] In the unidirectional narrow viewing angle mode, a common voltage is applied to the first viewing angle control electrode, and a second voltage is applied to the second viewing angle control electrode. The second voltage is less than a second preset value and greater than a third preset value, so as to drive the positive liquid crystal molecules in the first liquid crystal layer to adopt a first tilted posture and have a first tilt angle with the second substrate.

[0023] In the second wide viewing angle mode, a common voltage is applied to the first viewing angle control electrode, and a third voltage is applied to the second viewing angle control electrode. The third voltage is less than a fourth preset value and greater than a fifth preset value, so as to drive the positive liquid crystal molecules in the first liquid crystal layer to adopt a second tilted posture and have a second tilt angle with the second substrate. The first tilt angle is greater than the second tilt angle.

[0024] Among them, the first preset value > the second preset value > the third preset value > the fourth preset value > the fifth preset value.

[0025] Furthermore, the first liquid crystal layer consists of negative liquid crystal molecules. In the initial state, the negative liquid crystal molecules in the first liquid crystal layer are vertical and perpendicular to the first substrate and the second substrate. The control method includes:

[0026] In the first wide viewing angle mode, a common voltage is applied to the first viewing angle control electrode, and a first voltage is applied to the second viewing angle control electrode. The first voltage is equal to the common voltage, so as to drive the negative liquid crystal molecules in the first liquid crystal layer to maintain a vertical posture and be perpendicular to the first substrate and the second substrate.

[0027] In the unidirectional narrow viewing angle mode, a common voltage is applied to the first viewing angle control electrode, and a second voltage is applied to the second viewing angle control electrode. The second voltage is greater than a sixth preset value and less than a seventh preset value, so as to drive the negative liquid crystal molecules in the first liquid crystal layer to adopt a first tilted posture and have a first tilt angle with the second substrate.

[0028] In the second wide viewing angle mode, a common voltage is applied to the first viewing angle control electrode, and a third voltage is applied to the second viewing angle control electrode. The third voltage is greater than an eighth preset value and less than a ninth preset value, so as to drive the negative liquid crystal molecules in the first liquid crystal layer to adopt a second tilted posture and have a second tilt angle with the second substrate. The first tilt angle is greater than the second tilt angle.

[0029] Among them, the sixth preset value < the seventh preset value < the eighth preset value < the ninth preset value.

[0030] The beneficial effects of this invention are as follows: By setting a first polarizer and a first quarter-wave plate on a first substrate, with the first polarizer located on the side of the first quarter-wave plate away from the first liquid crystal layer, and setting a second polarizer and a second quarter-wave plate on a second substrate, with the second polarizer located on the side of the second quarter-wave plate away from the first liquid crystal layer, and by setting the transmission axis of the first polarizer perpendicular to the transmission axis of the second polarizer, and by setting the transmission axis of the first polarizer at 45° to the fast axis of the first quarter-wave plate, and the transmission axis of the second polarizer at 45° to the fast axis of the second quarter-wave plate, the light is polarized by the polarizer and delayed by λ / 4 by the quarter-wave plate before and after passing through the first liquid crystal layer. Combined with the first and second viewing angle control electrodes, the liquid crystal molecules in the first liquid crystal layer are deflected at different angles in the vertical direction, thereby achieving multi-directional viewing angle switching between a first wide viewing angle mode, a unidirectional narrow viewing angle mode, and a second wide viewing angle mode. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the dimming box in Embodiment 1 of the present invention.

[0032] Figure 2 This is a schematic diagram of the dimming box in its initial state in Embodiment 1 of the present invention.

[0033] Figure 3 This is a schematic diagram of the structure of the multi-view mode switchable display device in the initial state according to Embodiment 1 of the present invention.

[0034] Figure 4 This is a schematic diagram of the multi-view mode switchable display device in the first wide-view mode according to Embodiment 1 of the present invention.

[0035] Figure 5 This is a schematic diagram of the multi-view switching display device in the unidirectional narrow viewing angle mode according to Embodiment 1 of the present invention.

[0036] Figure 6 This is a schematic diagram of the multi-view mode switchable display device in the second wide-view mode according to Embodiment 1 of the present invention.

[0037] Figure 7 This is a driving waveform diagram of the multi-view mode switchable display device in Embodiment 1 of the present invention.

[0038] Figure 8 This is one of the simulation diagrams of the multi-view mode switchable display device in the first wide-view mode in Embodiment 1 of the present invention.

[0039] Figure 9 This is the second simulation diagram of the multi-view mode switchable display device in the first wide-view mode of the present invention.

[0040] Figure 10 This is the third simulation diagram of the multi-view mode switchable display device in the first wide-view mode of the present invention.

[0041] Figure 11 This is one of the simulation diagrams of the multi-view switching display device in the unidirectional narrow viewing angle mode in Embodiment 1 of the present invention.

[0042] Figure 12 This is the second simulation diagram of the multi-view switching display device in the unidirectional narrow viewing angle mode in Embodiment 1 of the present invention.

[0043] Figure 13 This is the third simulation diagram of the multi-view switching display device in the unidirectional narrow viewing angle mode in Embodiment 1 of the present invention.

[0044] Figure 14 This is a simulation diagram of the multi-view mode switchable display device in Embodiment 1 of the present invention under different voltages in the second wide viewing mode.

[0045] Figure 15 a is a simulation diagram of the multi-view mode switchable display device in the second wide viewing angle mode 1.4V in Embodiment 1 of the present invention.

[0046] Figure 15 b is a simulation diagram of the multi-view mode switchable display device in the second wide viewing angle mode 1.6V in Embodiment 1 of the present invention.

[0047] Figure 16 a is a simulation diagram of the multi-view mode switchable display device in the second wide viewing angle mode 1.8V in Embodiment 1 of the present invention.

[0048] Figure 16 b is a simulation diagram of the multi-view mode switchable display device in the second wide viewing angle mode 2.0V in Embodiment 1 of the present invention.

[0049] Figure 17 This is a simulation diagram of the multi-view mode switchable display device in the second wide-view mode in Embodiment 1 of the present invention.

[0050] Figure 18 This is a schematic diagram of the multi-view mode switchable display device in the first wide-view mode according to Embodiment 2 of the present invention.

[0051] Figure 19 This is a schematic diagram of the multi-view switching display device in the unidirectional narrow viewing angle mode in Embodiment 2 of the present invention.

[0052] Figure 20 This is a schematic diagram of the multi-view mode switchable display device in the second wide-view mode according to Embodiment 2 of the present invention.

[0053] Figure 21 This is a driving waveform diagram of the multi-view mode switchable display device in Embodiment 2 of the present invention.

[0054] Figure 22 This is one of the schematic diagrams of the planar structure of the display device in this invention.

[0055] Figure 23 This is the second schematic diagram of the planar structure of the display device in this invention. Detailed Implementation

[0056] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of the multi-view mode switchable display device and control method proposed according to the present invention:

[0057] [Example 1]

[0058] Figure 1 This is a three-dimensional structural diagram of the dimming box in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the dimming box in its initial state in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the structure of the multi-view mode switchable display device in the initial state according to Embodiment 1 of the present invention. Figure 4 This is a schematic diagram of the multi-view mode switchable display device in the first wide-view mode according to Embodiment 1 of the present invention. Figure 5 This is a schematic diagram of the multi-view switching display device in the unidirectional narrow viewing angle mode according to Embodiment 1 of the present invention. Figure 6 This is a schematic diagram of the multi-view mode switchable display device in the second wide-view mode according to Embodiment 1 of the present invention.

[0059] like Figures 1 to 6 As shown, a multi-viewpoint mode switchable display device provided in Embodiment 1 of the present invention includes a dimming box 10 and a display box 20 stacked on top of the dimming box 10. In this embodiment, the dimming box 10 is located above the display box 20, that is, the dimming box 10 is located on the light-emitting side of the display box 20. The dimming box 10 is used to control the viewing angle state of the display device, and the display box 20 is used to control the display device to display a normal image. Of course, in other embodiments, the dimming box 10 may also be located below the display box 20, that is, the display box 20 is located on the light-emitting side of the dimming box 10.

[0060] The dimming box 10 includes a first substrate 11, a second substrate 12 disposed opposite to the first substrate 11, and a first liquid crystal layer 13 disposed between the first substrate 11 and the second substrate 12. Preferably, the first liquid crystal layer 13 consists of positive liquid crystal molecules, i.e., liquid crystal molecules with positive dielectric anisotropy. The phase retardation of the first liquid crystal layer 13 is preferably 800 nm, and can be selected in the range of 500 nm to 1600 nm. Figure 2 As shown, in the initial state, the first liquid crystal layer 13 is in a flat position, meaning that the positive liquid crystal molecules in the first liquid crystal layer 13 are aligned parallel to the first substrate 11 and the second substrate 12. The alignment directions of the positive liquid crystal molecules closer to the first substrate 11 and the positive liquid crystal molecules closer to the second substrate 12 are parallel or antiparallel. The first liquid crystal layer 13 also has a certain pretilt angle, which is 0-7°, for example, 4.5°. This means that initially, the positive liquid crystal molecules form a small angle with the first substrate 11 and the second substrate 12, which can accelerate the response speed of the liquid crystal molecules deflecting in the vertical direction when switching viewing angles.

[0061] In this embodiment, the second substrate 12 is disposed on the side of the first liquid crystal layer 13 near the display cell 20, and the first substrate 11 is disposed on the side of the first liquid crystal layer 13 away from the display cell 20. Of course, in other embodiments, the second substrate 12 is disposed on the side of the first liquid crystal layer 13 away from the display cell 20, and the first substrate 11 is disposed on the side of the first liquid crystal layer 13 near the display cell 20.

[0062] The first substrate 11 has a first viewing angle control electrode 111 on the side facing the first liquid crystal layer 13, and the second substrate 12 has a second viewing angle control electrode 121 on the side facing the first liquid crystal layer 13, which cooperates with the first viewing angle control electrode 111. Both the first and second viewing angle control electrodes 111 and 121 are full-surface electrodes. At different viewing angles, different voltages are applied to the first and second viewing angle control electrodes 111 and 121, creating vertical electric fields of different intensities between them. This controls the positive liquid crystal molecules in the first liquid crystal layer 13 to deflect at different angles in the vertical direction, thereby enabling the dimming cell 10 to switch between wide-viewing-angle mode and narrow-viewing-angle mode.

[0063] A first polarizer 31 and a first quarter-wave plate 41 are disposed on a first substrate 11, with the first polarizer 31 located on the side of the first quarter-wave plate 41 away from the first liquid crystal layer 13. A second polarizer 32 and a second quarter-wave plate 42 are disposed on a second substrate 12, with the second polarizer 32 located on the side of the second quarter-wave plate 42 away from the first liquid crystal layer 13. The transmission axis of the first polarizer 31 is perpendicular to the transmission axis of the second polarizer 32, and the transmission axis of the first polarizer 31 forms a 45° angle with the fast axis of the first quarter-wave plate 41, and the transmission axis of the second polarizer 32 forms a 45° angle with the fast axis of the second quarter-wave plate 42. By designing the first polarizer 31, the second polarizer 32, the first quarter-wave plate 41, and the second quarter-wave plate 42 with special angles and positions, light is polarized by the polarizers and delayed by a phase of λ / 4 by the quarter-wave plate before and after passing through the first liquid crystal layer 13. In addition, the first viewing angle control electrode 111 and the second viewing angle control electrode 121 control the liquid crystal molecules in the first liquid crystal layer 13 to deflect at different angles in the vertical direction, thereby realizing multi-directional viewing angle switching between the first wide viewing angle mode, the unidirectional narrow viewing angle mode, and the second wide viewing angle mode.

[0064] In this embodiment, the fast axis of the first quarter-wave plate 41 and the fast axis of the second quarter-wave plate 42 are parallel to each other, and the alignment direction of the first liquid crystal layer 13 is at 45° to the transmission axis of the second polarizer 32. For example, the fast axis of the first quarter-wave plate 41 and the fast axis of the second quarter-wave plate 42 are both 90°, the transmission axis of the first polarizer 31 is 135° (or -45°), the transmission axis of the second polarizer 32 is 45°, and the alignment direction of the first liquid crystal layer 13 is 0°.

[0065] In this embodiment, the first polarizer 31 and the first quarter-wave plate 41 are both located on the side of the first substrate 11 away from the first liquid crystal layer 13, that is, the first quarter-wave plate 41 is sandwiched between the first polarizer 31 and the first substrate 11. The second polarizer 32 and the second quarter-wave plate 42 are both located on the side of the second substrate 12 away from the first liquid crystal layer 13, that is, the second quarter-wave plate 42 is sandwiched between the second polarizer 32 and the second substrate 12.

[0066] Furthermore, at least one of the first viewing angle control electrode 111 and the second viewing angle control electrode 121 has an insulating layer 122 on the side facing the first liquid crystal layer 13; that is, the first viewing angle control electrode 111 has an insulating layer 122 on the side facing the first liquid crystal layer 13; or, the second viewing angle control electrode 121 has an insulating layer 122 on the side facing the first liquid crystal layer 13; or, both the first viewing angle control electrode 111 and the second viewing angle control electrode 121 have insulating layers 122 on the side facing the first liquid crystal layer 13. In this embodiment, as... Figure 2 As shown, the second viewing angle control electrode 121 has an insulating layer 122 on the side facing the first liquid crystal layer 13 to prevent short circuit between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, thereby increasing the yield. Preferably, the thickness of the insulating layer 122 is 0.25 μm. This is because conductive impurities may enter the dimming cell during the cell assembly process, causing a short circuit between the first viewing angle control electrode 111 and the second viewing angle control electrode 121.

[0067] In this embodiment, the display box 20 is preferably a liquid crystal cell. Of course, in other embodiments, the display box 20 can also be a self-emissive display (e.g., an OLED display, a Micro LED display), but the dimming box 10 must be disposed above the display box 20.

[0068] like Figures 3-6 As shown, the display cell 20 includes a color filter substrate 21, an array substrate 22 disposed opposite to the color filter substrate 21, and a second liquid crystal layer 23 disposed between the color filter substrate 21 and the array substrate 22. The second liquid crystal layer 23 preferably uses negative liquid crystal molecules, that is, liquid crystal molecules with negative dielectric anisotropy. For example... Figure 3As shown, in the initial state, the negative liquid crystal molecules in the second liquid crystal layer 23 are aligned parallel to the color filter substrate 21 and the array substrate 22. The alignment direction of the negative liquid crystal molecules near the color filter substrate 21 is parallel or antiparallel to that of the negative liquid crystal molecules near the array substrate 22. Of course, in other embodiments, the second liquid crystal layer 23 can also use positive liquid crystal molecules, and the display cell 20 can be in TN mode or VA mode.

[0069] In this embodiment, the display cell 20 is in FFS mode. The liquid crystal molecules in the second liquid crystal layer 23 are preferably negative liquid crystal molecules (because they have higher transmittance and contrast), but positive liquid crystal molecules can also be used. When the display mode is TN mode, positive liquid crystal molecules are used, and when it is VA mode, negative liquid crystal molecules are used.

[0070] A third polarizer 33 is provided on the side of the display box 20 away from the dimming box 10. The light transmission axis of the second polarizer 32 between the dimming box 10 and the display box 20 is perpendicular to the light transmission axis of the third polarizer 33. For example, the light transmission axis of the first polarizer 31 is 135° (or -45°), the light transmission axis of the second polarizer 32 is 45°, and the light transmission axis of the third polarizer 33 is 135° (or -45°). Of course, in other embodiments, when the dimming box 10 is located below the display box 20, the first polarizer 31 is closer to the display box 20, and therefore the light transmission axis of the first polarizer 31 is perpendicular to the light transmission axis of the third polarizer 33. For example, the light transmission axis of the first polarizer 31 is 135°, the light transmission axis of the second polarizer 32 is 45°, and the light transmission axis of the third polarizer 33 is 45°.

[0071] A compensation film or polarizer, stacked on top of the second polarizer 32, can be disposed between the dimming box 10 and the display box 20. The light transmission axis of the polarizer must be parallel to the light transmission axis of the second polarizer 32. The compensation film can be disposed on the upper side or the lower side of the second polarizer 32. The compensation film can be an enhancement film (APF) or a brightness enhancement polarizer (a composite film of a brightness enhancement film and a polarizer, i.e., an APF POL film, with the bright side of the brightness enhancement film facing upwards). The light transmission axis of the brightness enhancement polarizer must be parallel to the light transmission axis of the second polarizer 32 to improve the privacy protection effect. Of course, the compensation film can also be a viewing angle compensation film to improve the narrow viewing angle effect.

[0072] The color filter substrate 21 has an array of color resist layers 212 and a black matrix 211 that separates the color resist layers 212. The color resist layers 212 include red (R), green (G) and blue (B) color resist materials and form red (R), green (G) and blue (B) sub-pixels respectively. The black matrix 211 is disposed at the edge of each sub-pixel and has a grid structure.

[0073] The array substrate 22 has multiple pixel units defined by multiple scan lines (not shown) and multiple data lines (not shown) that are mutually insulated and intersecting on the side facing the second liquid crystal layer 23. Each pixel unit has a pixel electrode 222 and a thin-film transistor (not shown). The pixel electrode 222 is electrically connected to the data line of the adjacent thin-film transistor through the thin-film transistor. The thin-film transistor includes a gate, an active layer, a drain, and a source. The gate and the scan lines are located on the same layer and are electrically connected. The gate and the active layer are isolated by an insulating layer. The source is electrically connected to the data line, and the drain is electrically connected to the pixel electrode 222 through a contact hole.

[0074] like Figure 3 As shown, in this embodiment, a common electrode 221 is further provided on the side of the array substrate 22 facing the second liquid crystal layer 23. The common electrode 221 and the pixel electrode 222 are located on different layers and are insulated from each other by an insulating layer. The common electrode 221 can be located above or below the pixel electrode 222. Figure 3 The diagram shows the common electrode 221 located below the pixel electrode 222. Preferably, the common electrode 221 is a planar electrode disposed across the entire surface, and the pixel electrode 222 is a block electrode disposed within each pixel unit or a slit electrode with multiple electrode strips, to form a fringe field switching (FFS) mode. Of course, in other embodiments, the pixel electrode 222 and the common electrode 221 may be located on the same layer, but they are insulated from each other. Both the pixel electrode 222 and the common electrode 221 may include multiple electrode strips, and the electrode strips of the pixel electrode 222 and the electrode strips of the common electrode 221 are arranged alternately to form an in-plane switching (IPS) mode; or, in other embodiments, the array substrate 22 has a pixel electrode 222 on the side facing the second liquid crystal layer 23, and the color filter substrate 21 has a common electrode 221 on the side facing the second liquid crystal layer 23 to form a TN mode or a VA mode.

[0075] The first substrate 11, the second substrate 12, the color filter substrate 21, and the array substrate 22 can be made of materials such as glass, acrylic, and polycarbonate. The first viewing angle control electrode 111, the second viewing angle control electrode 121, the common electrode 221, and the pixel electrode 222 can be made of materials such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0076] The present invention also provides a display device, including a display panel as described above and a backlight module 50, wherein the backlight module 50 is located below the display panel and is used to provide a backlight source for the display panel. Of course, if the display box 20 is a self-emissive display, the display device does not need to be provided with an additional backlight source.

[0077] The backlight module 50 includes a backlight source 51 and a privacy layer 53, which reduces the range of light emission angles. A brightness enhancement film 52 is also provided between the backlight source 51 and the privacy layer 53, increasing the brightness of the backlight module 50. The privacy layer 53 acts like a miniature venetian blind, blocking light with a large incident angle while allowing light with a smaller incident angle to pass through, thus reducing the range of light angles passing through the privacy layer 53. The privacy layer 53 includes multiple parallel light-blocking walls and light-transmitting holes located between adjacent light-blocking walls. Light-absorbing material is provided on both sides of the light-blocking walls. Alternatively, the backlight source 51 can be a light-collecting backlight, eliminating the need for a privacy layer 53; however, light-collecting backlights are more expensive than conventional backlights.

[0078] The backlight module 50 can be an edge-lit backlight module or a direct-lit backlight module. Preferably, the backlight module 50 adopts a collimated backlight (CBL) mode, which can collect light and ensure display effect.

[0079] Figure 7 This is a driving waveform diagram of the multi-view mode switchable display device in Embodiment 1 of the present invention. For example... Figure 7 As shown, the present invention also provides a control method for a display device, the control method being used to control the display device as described above, the control method comprising:

[0080] like Figure 4 and Figure 7 As shown, in the first wide viewing angle mode, corresponding first wide viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, respectively, to control the liquid crystal molecules in the first liquid crystal layer 13 to be in a vertical orientation and perpendicular to the first substrate 11 and the second substrate 12. Specifically, a common voltage Vcom is applied to the first viewing angle control electrode 111, and a first voltage V1 is applied to the second viewing angle control electrode 121. The first voltage V1 is greater than a first preset value (e.g., 7V), that is, there is a large voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, forming a strong vertical electric field. Figure 4 In the first liquid crystal layer 13 (E2), the positive liquid crystal molecules are significantly deflected in the vertical direction and assume a vertical orientation. These molecules are perpendicular to the first substrate 11 and the second substrate 12, thus achieving a first wide viewing angle display. The common voltage Vcom is, for example, 0V, and the first voltage V1 is, for example, an 8V AC voltage. A corresponding grayscale voltage is applied to the pixel electrode 222, creating a voltage difference between the pixel electrode 222 and the common electrode 221 and generating a horizontal electric field. Figure 4The negative liquid crystal molecules are deflected in the horizontal direction in a direction perpendicular to the horizontal electric field (E1). The gray level voltage includes 0 to 255 gray level voltages. When different gray level voltages are applied to the pixel electrode 222, the pixel unit presents different brightness, thereby displaying different images, so as to realize the normal display of the display device in the first wide viewing angle.

[0081] Figure 8 This is one of the simulation diagrams of the multi-view mode switchable display device in the first wide-view mode in Embodiment 1 of the present invention. Figure 9 This is the second simulation diagram of the multi-view mode switchable display device in the first wide-view mode of the present invention. Figure 10 This is the third simulation diagram of the multi-view mode switchable display device in the first wide-view mode of Embodiment 1 of the present invention. Figures 8-10 As shown, in the first wide viewing angle mode, the display device has a wide viewing angle, and the brightness gradually decreases from the center of the display device towards the edges, regardless of the viewing angle from the center (…). Figure 10 (C-0°) or from a broader perspective ( Figure 10 The image is clearly visible whether viewed at L-45° or R-45°.

[0082] like Figure 5 and Figure 7 As shown, in the unidirectional narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, respectively, to control the liquid crystal molecules in the first liquid crystal layer 13 to adopt a first tilted posture and have a first tilt angle with the second substrate 12. Specifically, a common voltage Vcom is applied to the first viewing angle control electrode 111, and a second voltage V2 is applied to the second viewing angle control electrode 121. The second voltage V2 is less than a second preset value (e.g., 5V) and greater than a third preset value (e.g., 2.5V), that is, there is a large voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, forming a strong vertical electric field. Figure 5 In the first liquid crystal layer 13 (E3), the positive liquid crystal molecules are significantly deflected vertically and exhibit a first tilted posture, forming a first tilt angle with the second substrate 12. Furthermore, combined with the special angle design of the first polarizer 31, the second polarizer 32, the first quarter-wave plate 41, and the second quarter-wave plate 42, a unidirectional narrow viewing angle display is achieved. The common voltage Vcom is, for example, 0V, and the second voltage V2 is, for example, an AC voltage of 3V. A corresponding grayscale voltage is applied to the pixel electrode 222, creating a voltage difference between the pixel electrode 222 and the common electrode 221, and generating a horizontal electric field. Figure 5The negative liquid crystal molecules are deflected in the horizontal direction in a direction perpendicular to the horizontal electric field (E1). The gray level voltage includes 0 to 255 gray level voltages. When different gray level voltages are applied to the pixel electrode 222, the pixel unit presents different brightness, thereby displaying different images, so as to realize the normal display of the display device under a unidirectional narrow viewing angle.

[0083] Figure 11 This is one of the simulation diagrams of the multi-view switching display device in the unidirectional narrow viewing angle mode in Embodiment 1 of the present invention. Figure 12 This is the second simulation diagram of the multi-view switching display device in the unidirectional narrow viewing angle mode in Embodiment 1 of the present invention. Figure 13 This is the third simulation diagram of the multi-view switchable display device in unidirectional narrow viewing angle mode in Embodiment 1 of the present invention. Figures 11-13 As shown, in the unidirectional narrow viewing angle mode, the right side of the display device has a larger viewing angle, while the left side has a smaller viewing angle. The brightness of the right side of the display device is much greater than that of the left side. From the center viewing angle ( Figure 13 (C-0°) and wide angle on the right ( Figure 13 The image is clearly visible when viewed from a mid-45° angle (R-45°), while the image is clearly visible from a wide viewing angle on the left (R-45°). Figure 13 The displayed image cannot be seen at a viewing angle of L-45°. Therefore, the one-way narrow viewing angle mode is suitable for situations where someone is watching from one side of the display device. For example, while driving, the passenger can watch the video normally, while the driver's position is in anti-peeping mode, ensuring the driver's focus and improving safety.

[0084] like Figure 6 and Figure 7 As shown, in the second wide viewing angle mode, corresponding second wide viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, respectively, to control the liquid crystal molecules in the first liquid crystal layer 13 to adopt a second tilted posture and have a second tilt angle with the second substrate 12, wherein the first tilt angle is greater than the second tilt angle. Specifically, a common voltage Vcom is applied to the first viewing angle control electrode 111, and a third voltage V3 is applied to the second viewing angle control electrode 121. The third voltage V3 is less than a fourth preset value (e.g., 2.2V) and greater than a fifth preset value (e.g., 0.8V), that is, there is a small voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and a weak vertical electric field is formed. Figure 6In the first liquid crystal layer 13 (E4), the positive liquid crystal molecules undergo a slight deflection in the vertical direction and adopt a second tilted posture. The positive liquid crystal molecules in the first liquid crystal layer 13 and the second substrate 12 have a second tilt angle, wherein the first tilt angle is greater than the second tilt angle. Furthermore, combined with the special angle design of the first polarizer 31, the second polarizer 32, the first quarter-wave plate 41, and the second quarter-wave plate 42, a second wide viewing angle display is achieved. The common voltage Vcom is, for example, 0V, and the third voltage V3 is, for example, AC voltages of 1.4V, 1.6V, 1.8V, and 2.0V. A corresponding grayscale voltage is applied to the pixel electrode 222, creating a voltage difference between the pixel electrode 222 and the common electrode 221 and generating a horizontal electric field. Figure 6 E1) causes the negative liquid crystal molecules to deflect in the horizontal direction in a direction perpendicular to the horizontal electric field. The gray level voltage includes gray level voltages from 0 to 255. When different gray level voltages are applied to the pixel electrode 222, the pixel unit presents different brightness, thereby displaying different images, so as to realize the normal display of the display device in the second wide viewing angle.

[0085] Figure 14 This is a simulation diagram of the multi-view mode switchable display device in Embodiment 1 of the present invention under different voltages in the second wide viewing mode. Figure 15 a is a simulation diagram of the multi-view mode switchable display device in the second wide viewing angle mode 1.4V in Embodiment 1 of the present invention. Figure 15 b is a simulation diagram of the multi-view mode switchable display device in the second wide viewing angle mode 1.6V in Embodiment 1 of the present invention. Figure 16 a is a simulation diagram of the multi-view mode switchable display device in the second wide viewing angle mode 1.8V in Embodiment 1 of the present invention. Figure 16 b is a simulation diagram of the multi-view mode switchable display device in the second wide viewing angle mode 2.0V in Embodiment 1 of the present invention. Figure 17 This is a simulation diagram of the multi-view mode switchable display device in the second wide-view mode in Embodiment 1 of the present invention. Figure 14 Curve W1 represents the simulated curve of brightness versus viewing angle when the third voltage V3 is 1.4V. Figure 14 Curve W2 represents the simulated curve of brightness versus viewing angle when the third voltage V3 is 1.6V. Figure 14 The curve W3 represents the simulated curve of brightness versus viewing angle when the third voltage V3 is 1.8V. Figure 14 Curve W4 represents the simulated curve of brightness versus viewing angle when the third voltage V3 is 2.0V. For example... Figures 14-17As shown, in the second wide viewing angle mode, the display device has a wide viewing angle. The brightness has a peak viewing angle on both the left and right sides of the display device. The brightness gradually decreases from the peak viewing angle towards the edge and center of the display device. The brightness on the left and right sides of the display device is much greater than the brightness at the center. From the left wide viewing angle (… Figure 17 (Middle L-45°) and right-side wide angle ( Figure 17 The image is clearly visible and bright when viewed from a central viewing angle (R-45°), while the image is brighter from a central viewing angle (R-45°). Figure 17 At a viewing angle of 0° (C-0°), although the displayed image is visible, the brightness is low. Therefore, the second wide viewing angle mode is suitable for situations where people are viewing the display from the left or right sides. Additionally, due to... Figures 14-16 As can be seen from b, the peak viewing angles of brightness on the left and right sides of the display device can be adjusted according to the magnitude of the voltage applied to the second viewing angle control electrode 121.

[0086] Among them, the first preset value > the second preset value > the third preset value > the fourth preset value > the fifth preset value.

[0087] [Example 2]

[0088] Figure 18 This is a schematic diagram of the multi-view mode switchable display device in the first wide-view mode according to Embodiment 2 of the present invention. Figure 19 This is a schematic diagram of the multi-view switching display device in the unidirectional narrow viewing angle mode in Embodiment 2 of the present invention. Figure 20 This is a schematic diagram of the multi-view mode switchable display device in the second wide-view mode of Embodiment 2 of the present invention. Figures 18 to 20 As shown, the multi-view mode switchable display device provided in Embodiment 2 of the present invention is similar to that in Embodiment 1. Figures 1 to 6 The multi-viewing-mode switchable display devices are basically the same, except that in this embodiment, the first liquid crystal layer 13 consists of negative liquid crystal molecules, that is, liquid crystal molecules with negative dielectric anisotropy. Figure 18 As shown, in the initial state, the negative liquid crystal molecules in the first liquid crystal layer 13 are vertically aligned and perpendicular to the first substrate 11 and the second substrate 12. Therefore, in this embodiment, the dimming cell 10 is in the first wide viewing angle mode in the initial state. It is understood that the first substrate 11 and the second substrate 12 need to be fitted with alignment layers with high pretilt angles on the side facing the first liquid crystal layer 13 to ensure that the negative liquid crystal molecules initially remain vertical. Compared to Embodiment 1, this embodiment can reduce power consumption in the first wide viewing angle mode.

[0089] Figure 21 This is a driving waveform diagram of the multi-view mode switchable display device in Embodiment 2 of the present invention. For example... Figure 21As shown, the present invention also provides a control method for a display device, the control method being used to control the display device as described above, the control method comprising:

[0090] like Figure 18 and Figure 21 As shown, in the first wide viewing angle mode, corresponding first wide viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, respectively, to control the liquid crystal molecules in the first liquid crystal layer 13 to be in a vertical posture and perpendicular to the first substrate 11 and the second substrate 12. Specifically, a common voltage Vcom is applied to the first viewing angle control electrode 111, and a first voltage V1 is applied to the second viewing angle control electrode 121. The first voltage V1 is equal to the common voltage Vcom, that is, there is no voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and no vertical electric field is formed. The negative liquid crystal molecules in the first liquid crystal layer 13 do not deflect in the vertical direction and maintain the initial vertical posture. The negative liquid crystal molecules in the first liquid crystal layer 13 are perpendicular to the first substrate 11 and the second substrate 12, thereby realizing the first wide viewing angle display. Among them, the common voltage Vcom and the first voltage V1 are both 0V. The pixel electrode 222 is applied with a corresponding gray level voltage, and a voltage difference is formed between the pixel electrode 222 and the common electrode 221, generating a horizontal electric field. Figure 18 The negative liquid crystal molecules are deflected in the horizontal direction in a direction perpendicular to the horizontal electric field (E1). The gray level voltage includes 0 to 255 gray level voltages. When different gray level voltages are applied to the pixel electrode 222, the pixel unit presents different brightness, thereby displaying different images, so as to realize the normal display of the display device in the first wide viewing angle.

[0091] like Figure 19 and Figure 21 As shown, in the unidirectional narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, respectively, to control the liquid crystal molecules in the first liquid crystal layer 13 to adopt a first tilted posture and have a first tilt angle with the second substrate 12. Specifically, a common voltage Vcom is applied to the first viewing angle control electrode 111, and a second voltage V2 is applied to the second viewing angle control electrode 121. The second voltage V2 is greater than a sixth preset value (e.g., 0.8V) and less than a seventh preset value (e.g., 2.2V), that is, there is a small voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and a weak vertical electric field is formed. Figure 19In the first liquid crystal layer 13 (E5), the negative liquid crystal molecules undergo a slight deflection in the vertical direction and adopt a first tilted posture, with a first tilt angle between the negative liquid crystal molecules in the first liquid crystal layer 13 and the second substrate 12. Furthermore, combined with the special angle design of the first polarizer 31, the second polarizer 32, the first quarter-wave plate 41, and the second quarter-wave plate 42, a unidirectional narrow viewing angle display is achieved. The common voltage Vcom is, for example, 0V, and the second voltage V2 is, for example, an AC voltage of 2V. A corresponding grayscale voltage is applied to the pixel electrode 222, creating a voltage difference between the pixel electrode 222 and the common electrode 221 and generating a horizontal electric field. Figure 19 The negative liquid crystal molecules are deflected in the horizontal direction in a direction perpendicular to the horizontal electric field (E1). The gray level voltage includes 0 to 255 gray level voltages. When different gray level voltages are applied to the pixel electrode 222, the pixel unit presents different brightness, thereby displaying different images, so as to realize the normal display of the display device under a unidirectional narrow viewing angle.

[0092] like Figure 20 and Figure 21 As shown, in the second wide viewing angle mode, corresponding second wide viewing angle voltages are applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, respectively, to control the liquid crystal molecules in the first liquid crystal layer 13 to adopt a second tilted posture and have a second tilt angle with the second substrate 12, wherein the first tilt angle is greater than the second tilt angle. A common voltage Vcom is applied to the first viewing angle control electrode 111, and a third voltage V3 is applied to the second viewing angle control electrode 121. The third voltage V3 is greater than an eighth preset value (e.g., 5V) and less than a ninth preset value (e.g., 8V), that is, there is a large voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and a strong vertical electric field is formed. Figure 20 In the first liquid crystal layer 13 (E6), the negative liquid crystal molecules are significantly deflected vertically and exhibit a second tilted posture. The negative liquid crystal molecules in the first liquid crystal layer 13 have a second tilt angle with the second substrate 12, wherein the first tilt angle is greater than the second tilt angle. Furthermore, combined with the special angle design of the first polarizer 31, the second polarizer 32, the first quarter-wave plate 41, and the second quarter-wave plate 42, a second wide viewing angle display is achieved. The common voltage Vcom is, for example, 0V, and the third voltage V3 is, for example, an AC voltage of 7V. A corresponding grayscale voltage is applied to the pixel electrode 222, creating a voltage difference between the pixel electrode 222 and the common electrode 221 and generating a horizontal electric field. Figure 20 E1) causes the negative liquid crystal molecules to deflect in the horizontal direction in a direction perpendicular to the horizontal electric field. The gray level voltage includes gray level voltages from 0 to 255. When different gray level voltages are applied to the pixel electrode 222, the pixel unit presents different brightness, thereby displaying different images, so as to realize the normal display of the display device in the second wide viewing angle.

[0093] Among them, the sixth preset value < the seventh preset value < the eighth preset value < the ninth preset value.

[0094] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0095] Figure 22 and Figure 23 This is a schematic diagram of the planar structure of the display device in this invention. Please refer to... Figure 22 and Figure 23 The display device is equipped with a viewing angle switching button 60, which allows the user to request a viewing angle switch from the display device. The viewing angle switching button 60 can be a physical button (such as...). Figure 22 As shown), it can also be used for software control or application programs (APP) to implement switching functions (such as... Figure 23 As shown, for example, the wide and narrow viewing angles can be set via a slider. When a user needs to switch between the first wide viewing angle mode, the one-way narrow viewing angle mode, and the second wide viewing angle mode, they can send a viewing angle switching request to the display device by operating the viewing angle switching button 60. For example, the user can switch between the first wide viewing angle mode, the one-way narrow viewing angle mode, and the second wide viewing angle mode by pressing the button a certain number of times. Finally, the driver chip 70 controls the electrical signals applied to the first viewing angle control electrode 111 and the second viewing angle control electrode 121, so that the display device can switch between the first wide viewing angle mode, the one-way narrow viewing angle mode, and the second wide viewing angle mode. When switching to the first wide viewing angle mode, the driving method is the driving method corresponding to the first wide viewing angle mode; when switching to the one-way narrow viewing angle mode, the driving method is the driving method corresponding to the one-way narrow viewing angle mode; and when switching to the second wide viewing angle mode, the driving method is the driving method corresponding to the second wide viewing angle mode. Therefore, the display device of this embodiment has strong operational flexibility and convenience, achieving a multi-functional display device that integrates entertainment video and privacy protection.

[0096] In this document, the directional terms such as up, down, left, right, front, and back are defined according to the position of the structures in the accompanying drawings and the relative positions of the structures, and are only used for clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein are only used for distinction in name and are not used to limit the number or order.

[0097] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content without departing from the scope of the technical solution of the present invention, which are equivalent embodiments with equivalent changes. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A display device with switchable multi-view mode, characterized in that, It includes a dimming box (10) and a display box (20) stacked with the dimming box (10); The dimming box (10) includes a first substrate (11), a second substrate (12) disposed opposite to the first substrate (11), and a first liquid crystal layer (13) disposed between the first substrate (11) and the second substrate (12). The first substrate (11) has a first viewing angle control electrode (111) on the side facing the first liquid crystal layer (13), and the second substrate (12) has a second viewing angle control electrode (121) cooperating with the first viewing angle control electrode (111) on the side facing the first liquid crystal layer (13). The first substrate (11) is provided with a first polarizer (31) and a first quarter-wave plate (41). The first polarizer (31) is located on the side of the first quarter-wave plate (41) away from the first liquid crystal layer (13). The second substrate (12) is provided with a second polarizer (32) and a second quarter-wave plate (42). The second polarizer (32) is located on the side of the second quarter-wave plate (42) away from the first liquid crystal layer (13). The light transmission axis of the first polarizer (31) is perpendicular to the light transmission axis of the second polarizer (32). The light transmission axis of the first polarizer (31) is at 45° to the fast axis of the first quarter-wave plate (41). The light transmission axis of the second polarizer (32) is at 45° to the fast axis of the second quarter-wave plate (42). In the first wide viewing angle mode, the liquid crystal molecules in the first liquid crystal layer (13) are controlled to be in a vertical position and perpendicular to the first substrate (11) and the second substrate (12); in the unidirectional narrow viewing angle mode, the liquid crystal molecules in the first liquid crystal layer (13) are controlled to be in a first tilted position and have a first tilt angle with the second substrate (12); in the second wide viewing angle mode, the liquid crystal molecules in the first liquid crystal layer (13) are controlled to be in a second tilted position and have a second tilt angle with the second substrate (12), wherein the first tilt angle is greater than the second tilt angle.

2. The multi-view mode switchable display device according to claim 1, characterized in that, The first polarizer (31) and the first quarter-wave plate (41) are both located on the side of the first substrate (11) away from the first liquid crystal layer (13); the second polarizer (32) and the second quarter-wave plate (42) are both located on the side of the second substrate (12) away from the first liquid crystal layer (13).

3. The multi-view mode switchable display device according to claim 1, characterized in that, The fast axis of the first quarter-wave plate (41) is parallel to the fast axis of the second quarter-wave plate (42).

4. The multi-view mode switchable display device according to claim 1, characterized in that, The first liquid crystal layer (13) consists of positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules in the first liquid crystal layer (13) are in a flat position and the alignment direction of the first liquid crystal layer (13) is at 45° to the light transmission axis of the second polarizer (32).

5. The multi-view mode switchable display device according to claim 1, characterized in that, The first liquid crystal layer (13) consists of negative liquid crystal molecules. In the initial state, the negative liquid crystal molecules in the first liquid crystal layer (13) are in a vertical position and perpendicular to the first substrate (11) and the second substrate (12).

6. The multi-view mode switchable display device according to claim 1, characterized in that, At least one of the first viewing angle control electrode (111) and the second viewing angle control electrode (121) has an insulating layer (122) on the side facing the first liquid crystal layer (13).

7. The multi-view mode switchable display device according to any one of claims 1-6, characterized in that, The display cell (20) includes a color filter substrate (21), an array substrate (22) disposed opposite to the color filter substrate (21), and a second liquid crystal layer (23) disposed between the color filter substrate (21) and the array substrate (22); a third polarizer (33) is provided on the side of the display cell (20) away from the dimming box (10), and the light transmission axis of the polarizer closest to the display cell (20) of the first polarizer (31) and the second polarizer (32) is perpendicular to the light transmission axis of the third polarizer (33).

8. A control method for controlling a multi-view mode switchable display device as described in any one of claims 1-7, characterized in that, The control method includes: In the first wide viewing angle mode, the corresponding first wide viewing angle voltage is applied to the first viewing angle control electrode (111) and the second viewing angle control electrode (121) respectively, so as to control the liquid crystal molecules in the first liquid crystal layer (13) to be in a vertical posture and perpendicular to the first substrate (11) and the second substrate (12). In the unidirectional narrow viewing angle mode, corresponding narrow viewing angle voltages are applied to the first viewing angle control electrode (111) and the second viewing angle control electrode (121) respectively, so as to control the liquid crystal molecules in the first liquid crystal layer (13) to be in a first tilted posture and have a first tilt angle with the second substrate (12); In the second wide viewing angle mode, corresponding second wide viewing angle voltages are applied to the first viewing angle control electrode (111) and the second viewing angle control electrode (121) respectively, controlling the liquid crystal molecules in the first liquid crystal layer (13) to be in a second tilted posture and have a second tilt angle with the second substrate (12), wherein the first tilt angle is greater than the second tilt angle.

9. The control method according to claim 8, characterized in that, The first liquid crystal layer (13) consists of positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules in the first liquid crystal layer (13) are in a flat position, and the alignment direction of the first liquid crystal layer (13) is at 45° to the light transmission axis of the second polarizer (32). The control method includes: In the first wide viewing angle mode, a common voltage (Vcom) is applied to the first viewing angle control electrode (111), and a first voltage (V1) is applied to the second viewing angle control electrode (121). The first voltage (V1) is greater than a first preset value, so as to drive the positive liquid crystal molecules in the first liquid crystal layer (13) to be in a vertical posture and perpendicular to the first substrate (11) and the second substrate (12). In the unidirectional narrow viewing angle mode, a common voltage (Vcom) is applied to the first viewing angle control electrode (111), and a second voltage (V2) is applied to the second viewing angle control electrode (121). The second voltage (V2) is less than a second preset value and greater than a third preset value, so as to drive the positive liquid crystal molecules in the first liquid crystal layer (13) to adopt a first tilted posture and have a first tilt angle with the second substrate (12). In the second wide viewing angle mode, a common voltage (Vcom) is applied to the first viewing angle control electrode (111), and a third voltage (V3) is applied to the second viewing angle control electrode (121). The third voltage (V3) is less than a fourth preset value and greater than a fifth preset value, so as to drive the positive liquid crystal molecules in the first liquid crystal layer (13) to adopt a second tilted posture and have a second tilt angle with the second substrate (12). The first tilt angle is greater than the second tilt angle. Among them, the first preset value > the second preset value > the third preset value > the fourth preset value > the fifth preset value.

10. The control method according to claim 8, characterized in that, The first liquid crystal layer (13) consists of negative liquid crystal molecules. In the initial state, the negative liquid crystal molecules in the first liquid crystal layer (13) are vertical and perpendicular to the first substrate (11) and the second substrate (12). The control method includes: In the first wide viewing angle mode, a common voltage (Vcom) is applied to the first viewing angle control electrode (111), and a first voltage (V1) is applied to the second viewing angle control electrode (121). The first voltage (V1) is equal to the common voltage (Vcom) to drive the negative liquid crystal molecules in the first liquid crystal layer (13) to maintain a vertical posture and be perpendicular to the first substrate (11) and the second substrate (12). In the unidirectional narrow viewing angle mode, a common voltage (Vcom) is applied to the first viewing angle control electrode (111), and a second voltage (V2) is applied to the second viewing angle control electrode (121). The second voltage (V2) is greater than a sixth preset value and less than a seventh preset value, so as to drive the negative liquid crystal molecules in the first liquid crystal layer (13) to adopt a first tilted posture and have a first tilt angle with the second substrate (12). In the second wide viewing angle mode, a common voltage (Vcom) is applied to the first viewing angle control electrode (111), and a third voltage (V3) is applied to the second viewing angle control electrode (121). The third voltage (V3) is greater than an eighth preset value and less than a ninth preset value, so as to drive the negative liquid crystal molecules in the first liquid crystal layer (13) to adopt a second tilted posture and have a second tilt angle with the second substrate (12). The first tilt angle is greater than the second tilt angle. Among them, the sixth preset value < the seventh preset value < the eighth preset value < the ninth preset value.

Images