Display device with switchable viewing angle and driving method thereof

Abstract

The application discloses a display device with switchable viewing angle and a driving method thereof. The display device comprises a first privacy film, a second privacy film, a light adjusting structure and a picture display control box which are arranged in layers. The first privacy film has a range of light emission angle reduction in a first direction, the second privacy film has a range of light emission angle reduction in a second direction, the first direction is perpendicular to the second direction, the first privacy film is located on the upper side of the light adjusting structure, and the second privacy film is located on the lower side of the light adjusting structure. The light adjusting structure has a scattering mode and a transmission mode in the second direction and can be switched between the scattering mode and the transmission mode. In the scattering mode, the light passing through the light adjusting structure is in a divergent state, and in the transmission mode, the light passing through the light adjusting structure is in a straight state. The display device is provided with two privacy films with different light collecting directions and a light adjusting structure, so that the display device has a narrow viewing angle in one direction and can realize switching between wide and narrow viewing angles in the other direction.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display device with switchable viewing angle and its driving method. Background Technology

[0002] Liquid crystal displays (LCDs) dominate the flat panel display field due to their advantages such as high image quality, small size, light weight, low driving voltage, low power consumption, no radiation, and relatively low manufacturing cost. With the continuous advancement of LCD technology, the viewing angle of displays has widened from approximately 120° to over 160°. While enjoying the wide viewing angle experience, people also desire to effectively protect trade secrets and personal privacy to avoid business losses or embarrassment caused by information leakage from the screen. Therefore, in addition to the requirement of a wide viewing angle, many situations also require display devices to have the function of switching between wide and narrow viewing angles.

[0003] Currently, the main method used is to attach a Venetian blind film to the display screen to achieve the switching between wide and narrow viewing angles. When privacy is required, the screen can be covered with the Venetian blind film to narrow the viewing angle. However, this method requires an extra Venetian blind film, which causes great inconvenience to users. Moreover, a Venetian blind film can only achieve one viewing angle. Once the Venetian blind film is attached, the viewing angle is fixed in the narrow viewing angle mode, making it impossible to switch freely between the wide and narrow viewing angle modes. In addition, the privacy film will reduce the brightness and affect the display effect.

[0004] Existing technologies also utilize a dual-cell structure of a dimming box and a display panel to achieve switching between wide and narrow viewing angles. The display panel is used for normal image display, while the dimming box controls the viewing angle switching. The dimming box includes an upper substrate, a lower substrate, and a liquid crystal layer between the upper and lower substrates. Viewing angle control electrodes on the upper and lower substrates apply a vertical electric field to the liquid crystal molecules, causing the liquid crystals to deflect vertically, thus achieving a narrow viewing angle mode. By controlling the voltage on the viewing angle control electrodes, switching between wide and narrow viewing angles can be achieved. Such wide-narrow viewing angle switchable display panels typically only allow for right-angle switching in the left-right or up-down directions.

[0005] However, existing automotive displays and other applications require a consistently narrow viewing angle in the vertical direction, while allowing for switching between narrow and wide viewing angles in the horizontal direction; or, conversely, a consistently narrow viewing angle in the horizontal direction, while allowing for switching between narrow and wide viewing angles in the vertical direction. Therefore, existing displays cannot meet the needs of these application scenarios. Summary of the Invention

[0006] In order to overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a display device with switchable viewing angle and its driving method, so as to solve the problem that the display device in the prior art cannot be fixed with a narrow viewing angle in one direction, while achieving wide and narrow viewing angle switching in another direction.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] The present invention provides a display device with switchable viewing angle, comprising a first privacy film, a second privacy film, a dimming structure, and a screen display control box stacked on top of each other;

[0009] The first privacy film has a range for reducing the angle of light emission in a first direction, and the second privacy film has a range for reducing the angle of light emission in a second direction. The first direction and the second direction are perpendicular to each other. The first privacy film is located on the upper side of the dimming structure, and the second privacy film is located on the lower side of the dimming structure.

[0010] The dimming structure has a scattering mode and a transmission mode in the second direction, and can switch between the scattering mode and the transmission mode. In the scattering mode, the light passing through the dimming structure is in a divergent state, and in the transmission mode, the light passing through the dimming structure is in a direct state.

[0011] The screen display control box is used to control the grayscale of the screen display.

[0012] Furthermore, the display device also includes a backlight module for providing a light source, and the screen display control box includes a color filter substrate, an array substrate disposed opposite to the color filter substrate, and a first liquid crystal layer located between the color filter substrate and the array substrate;

[0013] The color filter substrate is provided with a first polarizer, and the array substrate is provided with a second polarizer. The transmission axes of the first polarizer and the second polarizer are perpendicular to each other.

[0014] Furthermore,

[0015] The display control box, the first privacy film, the dimming structure, the second privacy film, and the backlight module are stacked in sequence.

[0016] Alternatively, the first privacy film, the screen display control box, the dimming structure, the second privacy film, and the backlight module are stacked sequentially.

[0017] Alternatively, the first privacy film, the dimming structure, the second privacy film, the screen display control box, and the backlight module may be stacked sequentially.

[0018] Furthermore, the screen display control box is located below the second privacy film. The screen display control box includes a driving substrate, a plurality of light-emitting diodes disposed on the driving substrate, and a protective layer covering the plurality of light-emitting diodes. The driving substrate is used to control the plurality of light-emitting diodes to display different gray levels.

[0019] Furthermore, the dimming structure includes a first substrate, a second substrate disposed opposite to the first substrate, and a polymer liquid crystal layer located between the first substrate and the second substrate. The first substrate is provided with a first electrode, and the second substrate is provided with a second electrode that cooperates with the first electrode.

[0020] In scattering mode, the polymer liquid crystal layer is hazy and has a light-scattering effect; in transmission mode, the polymer liquid crystal layer is transparent.

[0021] Furthermore, the polymer liquid crystal layer includes polymer dispersed liquid crystal, polymer network liquid crystal, or polymer stabilized cholesteric phase liquid crystal.

[0022] Furthermore, the dimming structure includes a first substrate, a second substrate disposed opposite to the first substrate, and a second liquid crystal layer located between the first substrate and the second substrate. The first substrate is provided with a first electrode, the second substrate is provided with a second electrode cooperating with the first electrode, and the second substrate is provided with a plurality of protrusion structures on the side facing the second liquid crystal layer, the protrusion structures extending along the first direction.

[0023] In scattering mode, the second liquid crystal layer is in a flat state, and the refractive index of the second liquid crystal layer is greater than the refractive index of the protrusion structure, thus having a light-scattering effect;

[0024] In transmission mode, the second liquid crystal layer is in a vertical position, and the refractive index of the second liquid crystal layer is equal to the refractive index of the protrusion structure.

[0025] Furthermore, the cross-sectional shape of the protrusion structure is a semi-circular structure, a triangular structure, or a trapezoidal structure.

[0026] This application also provides a driving method for a display device, the driving method being used to drive the display device as described above, the display device including a backlight module for providing a light source, the driving method including:

[0027] In the narrow viewing angle mode in the first direction and the wide viewing angle mode in the second direction, the dimming structure is controlled to be in a scattering mode in the second direction, and the light passing through the dimming structure is in a diverging state;

[0028] In the all-around narrow viewing angle mode, the dimming structure is controlled to be in the transmission mode in the second direction, and the light passing through the dimming structure is in the direct state;

[0029] The backlight module adjusts the luminous brightness according to the transmittance of the dimming structure to control the center brightness of the display device to remain within a preset range.

[0030] This application also provides a driving method for a display device, the driving method being used to drive the display device as described above, wherein the screen display control box is a self-emissive display panel located below the second privacy film, and the driving method includes:

[0031] In the narrow viewing angle mode in the first direction and the wide viewing angle mode in the second direction, the dimming structure is controlled to be in a scattering mode in the second direction, and the light passing through the dimming structure is in a diverging state;

[0032] In the all-around narrow viewing angle mode, the dimming structure is controlled to be in the transmission mode in the second direction, and the light passing through the dimming structure is in the direct state;

[0033] The display control box adjusts the luminous brightness according to the transmittance of the dimming structure to control the center brightness of the display device to remain within a preset range.

[0034] The beneficial effects of this invention are as follows: by combining a first privacy film and a second privacy film with a dimming structure, the first privacy film has a range for narrowing the angle of light emission in the first direction, and the second privacy film has a range for narrowing the angle of light emission in the second direction. The first direction and the second direction are perpendicular to each other, and the dimming structure has a scattering mode and a transmission mode in the second direction, thereby making the display device always have a narrow viewing angle in the first direction and can switch between wide and narrow viewing angles in the second direction to meet the application requirements of the display device in vehicle displays or other scenarios. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the display device in Embodiment 1 of the present invention at a wide viewing angle.

[0036] Figure 2 This is a schematic diagram of the display device in a narrow viewing angle according to Embodiment 1 of the present invention.

[0037] Figure 3 This is a schematic diagram illustrating the principle of the dimming structure using polymer-dispersed liquid crystal in Embodiment 1 of the present invention.

[0038] Figure 4 This is a schematic diagram illustrating the principle of the dimming structure using a polymer network liquid crystal in Embodiment 1 of the present invention.

[0039] Figure 5 This is a schematic diagram illustrating the principle of the dimming structure in Embodiment 1 of the present invention when a polymer-stabilized cholesteric liquid crystal is used.

[0040] Figure 6 a is a schematic diagram of the perspective when the pressure difference between the first electrode and the second electrode is 0V in Embodiment 1 of the present invention.

[0041] Figure 6 b is a schematic diagram of the perspective when the pressure difference between the first electrode and the second electrode in Embodiment 1 of the present invention is 5V.

[0042] Figure 7 a is a schematic diagram of the perspective when the voltage difference between the first electrode and the second electrode in Embodiment 1 of the present invention is 10V.

[0043] Figure 7 b is a schematic diagram of the perspective when the voltage difference between the first electrode and the second electrode in Embodiment 1 of the present invention is 20V.

[0044] Figure 8 This is a line graph showing the change in the privacy viewing angle of the dimming structure in Embodiment 1 of the present invention as a function of pressure difference.

[0045] Figure 9 This is a line graph showing the change in center brightness of the dimming structure as a function of pressure difference in Embodiment 1 of the present invention.

[0046] Figure 10 This is a schematic diagram of the control signal transmission of the display device in Embodiment 1 of the present invention.

[0047] Figure 11 This is a schematic diagram of the display device in Embodiment 2 of the present invention at a wide viewing angle.

[0048] Figure 12 This is a schematic diagram of the display device in a narrow viewing angle according to Embodiment 2 of the present invention.

[0049] Figure 13 This is a schematic diagram of the display device in Embodiment 3 of the present invention at a wide viewing angle.

[0050] Figure 14 This is a schematic diagram of the display device in a narrow viewing angle according to Embodiment 3 of the present invention.

[0051] Figure 15 This is a schematic diagram of the display device in Embodiment 4 of the present invention at a wide viewing angle.

[0052] Figure 16 This is a schematic diagram of the display device in the fourth embodiment of the present invention at a narrow viewing angle.

[0053] Figure 17 This is one of the three-dimensional structural schematic diagrams of the protrusion structure in Embodiment 4 of the present invention.

[0054] Figure 18 This is the second three-dimensional structural schematic diagram of the protrusion structure in Embodiment 4 of the present invention.

[0055] Figure 19 This is the third three-dimensional structural schematic diagram of the protruding structure in Embodiment 4 of the present invention.

[0056] Figure 20 a is a schematic diagram of the perspective when the pressure difference between the first electrode and the second electrode is 0V in Embodiment 4 of the present invention.

[0057] Figure 20 b is a schematic diagram of the perspective when the pressure difference between the first electrode and the second electrode is 5V in Embodiment 4 of the present invention.

[0058] Figure 21 a is a schematic diagram of the perspective when the voltage difference between the first electrode and the second electrode is 10V in Embodiment 4 of the present invention.

[0059] Figure 21 b is a schematic diagram of the perspective when the voltage difference between the first electrode and the second electrode in Embodiment 4 of the present invention is 20V.

[0060] Figure 22 This is a schematic diagram of the display device in Embodiment 5 of the present invention at a wide viewing angle.

[0061] Figure 23 This is a schematic diagram of the display device in embodiment five of the present invention at a narrow viewing angle. Detailed Implementation

[0062] 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 view-switching display device and its driving method proposed according to the present invention:

[0063] [Example 1]

[0064] Figure 1 This is a schematic diagram of the display device in Embodiment 1 of the present invention at a wide viewing angle. Figure 2 This is a schematic diagram of the display device in a narrow viewing angle according to Embodiment 1 of the present invention. Figure 3 This is a schematic diagram illustrating the principle of the dimming structure using polymer-dispersed liquid crystal in Embodiment 1 of the present invention. Figure 4 This is a schematic diagram illustrating the principle of the dimming structure using a polymer network liquid crystal in Embodiment 1 of the present invention. Figure 5 This is a schematic diagram illustrating the principle of the dimming structure in Embodiment 1 of the present invention when a polymer-stabilized cholesteric liquid crystal is used.

[0065] like Figures 1 to 5 As shown, the first embodiment of the present invention provides a display device with switchable viewing angle, including a first privacy film 11, a second privacy film 12, a dimming structure 20 and a screen display control box 30 stacked on top of each other.

[0066] The first privacy film 11 has a range for narrowing the light emission angle in a first direction, and the second privacy film 12 has a range for narrowing the light emission angle in a second direction. The first and second directions are perpendicular to each other. The first privacy film 11 is located on the upper side of the dimming structure 20, and the second privacy film 12 is located on the lower side of the dimming structure 20. For example, if the first privacy film 11 receives light vertically, then the second privacy film 12 receives light horizontally, thus ensuring that the display device maintains a narrow viewing angle vertically and allows for switching between wide and narrow viewing angles horizontally. Of course, the first privacy film 11 can also receive light horizontally, then the second privacy film 12 can receive light vertically, thus ensuring that the display device maintains a narrow viewing angle horizontally and allows for switching between wide and narrow viewing angles vertically. The privacy films (first privacy film 11 and second privacy film 12) function as a miniature venetian blind structure, blocking light with a large incident angle while allowing light with a small incident angle to pass through, thus reducing the range of angles of light passing through the privacy film. The privacy film includes multiple parallel light-blocking walls and light-transmitting holes located between two adjacent light-blocking walls. Light-absorbing materials are provided on both sides of the light-blocking walls. For a more detailed introduction to the privacy film, please refer to the existing technology, which will not be elaborated here.

[0067] The dimming structure 20 has a scattering mode and a transmission mode in the second direction, and can switch between the scattering mode and the transmission mode. In the scattering mode, the light passing through the dimming structure 20 is in a divergent state, and in the transmission mode, the light passing through the dimming structure 20 is in a direct state, that is, the exit angle of the light after passing through the dimming structure 20 will not change.

[0068] The screen display control box 30 is used to control the grayscale of the screen display. That is, the screen display control box 30 can be an ordinary display panel, which can control the light intensity of each sub-pixel, thereby controlling the grayscale of the screen display.

[0069] This application sets up a first privacy film 11 and a second privacy film 12, along with a dimming structure 20. The first privacy film 11 has a range for narrowing the angle of light emission in a first direction, and the second privacy film 12 has a range for narrowing the angle of light emission in a second direction. The first direction and the second direction are perpendicular to each other, and the dimming structure 20 has a scattering mode and a transmission mode in the second direction. This makes the display device always have a narrow viewing angle in the first direction, and can switch between wide and narrow viewing angles in the second direction to meet the application requirements of the display device in vehicle displays or other scenarios.

[0070] In this embodiment, the dimming structure 20 includes a first substrate, a second substrate 22 disposed opposite to the first substrate, and a polymer liquid crystal layer 23 located between the first substrate and the second substrate 22. A first electrode 211 is provided on the first substrate, and a second electrode 221 cooperating with the first electrode 211 is provided on the second substrate 22. By controlling the voltage on the first electrode 211 and the second electrode 221, the polymer liquid crystal layer 23 is controlled to switch between a scattering mode and a transmission mode.

[0071] like Figure 3 As shown, in this embodiment, the polymer liquid crystal layer 23 is a polymer-dispersed liquid crystal (PDLC). Figure 3 As shown in Figure a, the optical axes of the microdroplets composed of polymer-dispersed liquid crystal molecules are freely oriented, and their refractive index does not match that of the matrix. When light passes through the matrix, it is strongly scattered by the liquid crystal microdroplets, resulting in an opaque, milky-white, or translucent state. Figure 3 As shown in Figure b, applying an electric field can adjust the optical axis orientation of the liquid crystal droplets. When the refractive indices of the two electrodes match, a transparent state is achieved. Removing the electric field restores the liquid crystal droplets to their initial astigmatic state, thus enabling display. Specifically, in scattering mode, the pressure difference between the first electrode 211 and the second electrode 221 is less than a first preset value, causing the polymer-dispersed liquid crystal to appear hazy and have a scattering effect; in transmission mode, the pressure difference between the first electrode 211 and the second electrode 221 is greater than a second preset value, causing the polymer-dispersed liquid crystal to appear transparent. Therefore, the switching between the hazy and transparent states of the polymer-dispersed liquid crystal is controlled by controlling the electrical signal applied to the first electrode 211 and the second electrode 221. The smaller the pressure difference between the first electrode 211 and the second electrode 221, the closer the polymer-dispersed liquid crystal is to the hazy state; conversely, the larger the pressure difference, the closer the polymer-dispersed liquid crystal is to the transparent state. The polymer-dispersed liquid crystal has a scattering effect in the hazy state, and does not change the light emission angle in the transparent state.

[0072] like Figure 4 As shown, in another embodiment, the polymeric liquid crystal layer 23 can also be a polymeric network liquid crystal (PNLC). A polymeric network liquid crystal mixes low-molecular-weight liquid crystals with a prepolymer, and under certain conditions, undergoes a polymerization reaction, resulting in liquid crystal molecules being contained within a network. For example... Figure 4 As shown in Figure a, due to orientation induction, the liquid crystal will align uniformly, and the polymer monomers, which also possess a liquid crystal phase, will also align uniformly under the guest-host effect. At this point, polymerization phase separation is performed, yielding a uniformly aligned polymer network liquid crystal. Under no voltage, the polymer network liquid crystal is in a transparent state. Figure 4As shown in Figure b, when energized, the negative liquid crystals tend to align in parallel due to the electric field. At this time, the anchoring effect of the polymer network on the liquid crystal molecules prevents rotation, resulting in disordered liquid crystal alignment and scattering, producing a hazy state. Specifically, in scattering mode, the voltage difference between the first electrode 211 and the second electrode 221 is greater than a third preset value, causing the polymer network liquid crystal to be hazy and have a light-scattering effect; in transmission mode, the voltage difference between the first electrode 211 and the second electrode 221 is less than a fourth preset value, causing the polymer network liquid crystal to be transparent. Therefore, the switching between the hazy and transparent states of the polymer network liquid crystal is controlled by controlling the electrical signal applied to the first electrode 211 and the second electrode 221. The greater the voltage difference between the first electrode 211 and the second electrode 221, the closer the polymer network liquid crystal is to the hazy state; conversely, the smaller the voltage difference, the closer the polymer network liquid crystal is to the transparent state. The polymer network liquid crystal has a light-scattering effect in the hazy state, and does not change the light emission angle in the transparent state.

[0073] like Figure 5 As shown, in another embodiment, the polymer liquid crystal layer 23 can also be a polymer-stabilized cholesteric liquid crystal (PSCT). Figure 5 As shown in Figure a, the cholesteric phase of the polymer-stabilized cholesteric liquid crystal is in the P state, i.e., the transparent state, when the charge is removed: (e.g.) Figure 5 As shown in Figure b, when electricity is applied, the cholesteric phase changes to the FC state, i.e., the fog state, and scattering occurs. Specifically, in scattering mode, the voltage difference between the first electrode 211 and the second electrode 221 is greater than a fifth preset value, causing the polymer-stabilized cholesteric liquid crystal to be foggy and have a light-scattering effect; in transmission mode, the voltage difference between the first electrode 211 and the second electrode 221 is less than a sixth preset value, causing the polymer-stabilized cholesteric liquid crystal to be transparent. Therefore, the switching between the foggy and transparent states of the polymer-stabilized cholesteric liquid crystal is controlled by controlling the electrical signal applied to the first electrode 211 and the second electrode 221. The smaller the voltage difference between the first electrode 211 and the second electrode 221, the closer the polymer-stabilized cholesteric liquid crystal is to the foggy state; conversely, the larger the voltage difference between the first electrode 211 and the second electrode 221, the closer the polymer-stabilized cholesteric liquid crystal is to the transparent state. The polymer-stabilized cholesteric liquid crystal has a light-scattering effect in the foggy state, and does not change the light emission angle in the transparent state.

[0074] In this embodiment, the display device further includes a backlight module 40, which is used to provide a light source. The screen display control box 30, the first privacy film 11, the dimming structure 20, the second privacy film 12 and the backlight module 40 are stacked sequentially from top to bottom.

[0075] The display control box 30 is a liquid crystal display box. The display control box 30 includes a color filter substrate 31, an array substrate 32 disposed opposite to the color filter substrate 31, and a first liquid crystal layer 33 located between the color filter substrate 31 and the array substrate 32. In this embodiment, the first liquid crystal layer 33 uses positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy. In the initial state, the positive liquid crystal molecules in the first liquid crystal layer 33 are aligned parallel to the color filter substrate 31 and the array substrate 32, and the alignment direction of the positive liquid crystal molecules near the color filter substrate 31 is opposite to that of the positive liquid crystal molecules near the array substrate 32. Of course, in other embodiments, the first liquid crystal layer 33 can also use negative liquid crystal molecules, such as in VA display mode.

[0076] The color filter substrate 31 has a color resist layer 312 and black matrices (BM) 311 separating the color resist layer 312 on the side facing the first liquid crystal layer 33. The color resist layer 312 includes, for example, red (R), green (G), and blue (B) color resist materials, which respectively form red, green, and blue pixel units. The black matrices 311 are located between the red, green, and blue pixel units, so that adjacent pixel units are separated from each other by the black matrices 311.

[0077] The array substrate 32 has multiple pixel units defined by multiple scan lines and multiple data lines that are mutually insulated and intersecting on the side facing the first liquid crystal layer 33. The black matrix 311 corresponds vertically to the scan lines and data lines. Each pixel unit is provided with a pixel electrode 322 and a thin-film transistor. The pixel electrode 322 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 line 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. The drain is electrically connected to the pixel electrode 322 through a contact hole.

[0078] In this embodiment, a common electrode 321 is further provided on the side of the array substrate 32 facing the first liquid crystal layer 33. The common electrode 321 and the pixel electrode 322 are located on different layers and are insulated from each other by an insulating layer. The common electrode 321 may be located above or below the pixel electrode 322. Figure 1The diagram shows the common electrode 321 located below the pixel electrode 322. Preferably, the common electrode 321 is a planar electrode with its entire surface, and the pixel electrode 322 is a slit electrode with multiple electrode strips in each pixel unit to form a fringe field switching (FFS) mode. Of course, in other embodiments, the pixel electrode 322 and the common electrode 321 are located on the same layer, but they are insulated from each other. Both the pixel electrode 322 and the common electrode 321 may include multiple electrode strips, and the electrode strips of the pixel electrode 322 and the common electrode 321 are arranged alternately to form an in-plane switching (IPS) mode. Alternatively, the array substrate 32 has the pixel electrode 322 on the side facing the first liquid crystal layer 33, and the color filter substrate 31 has the common electrode 321 on the side facing the first liquid crystal layer 33 to form a TN mode or a VA mode. For further descriptions of the TN mode and VA mode, please refer to the prior art, which will not be repeated here.

[0079] Furthermore, a first polarizer 51 is provided on the side of the color filter substrate 31 away from the first liquid crystal layer 33, and a second polarizer 52 is provided on the side of the array substrate 32 away from the first liquid crystal layer 33. The transmission axes of the first polarizer 51 and the second polarizer 52 are perpendicular to each other. For example, the transmission axis of the first polarizer 51 is 0°, and the transmission axis of the second polarizer 52 is 90°.

[0080] The first substrate, the second substrate 22, the color filter substrate 31, and the array substrate 32 can be made of materials such as glass, acrylic, and polycarbonate. The first electrode 211, the second electrode 221, the common electrode 321, and the pixel electrode 322 can be made of materials such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0081] This embodiment also provides a driving method for a display device, which is used to drive the display device as described above. The driving method includes:

[0082] like Figure 1 As shown, in the narrow viewing angle mode in the first direction and the wide viewing angle mode in the second direction, the dimming structure 20 is controlled to be in a scattering mode in the second direction, and the light passing through the dimming structure 20 is in a diverging state. That is, when the dimming structure 20 is in the wide viewing angle mode, the display device is in a narrow viewing angle state in the first direction and a wide viewing angle state in the second direction.

[0083] In wide-viewing-angle mode, the dimming structure 20 is in a scattering state. The voltage difference between the first electrode 211 and the second electrode 221 is less than a first preset value, causing the polymer liquid crystal layer 23 to appear hazy and have a light-scattering effect. The first electrode 211 and the second electrode 221 may not have a voltage signal applied, or a voltage signal with a small voltage difference may be applied. This results in a better wide-viewing-angle effect for the display device, and the degree of scattering by the dimming structure 20 can be adjusted by the voltage signal applied to the first electrode 211 and the second electrode 221, thereby allowing the wide-viewing-angle effect of the display device in the second direction to be adjusted.

[0084] like Figure 2 As shown, in the all-around narrow viewing angle mode, the dimming structure 20 is controlled to be in transmission mode in the second direction, and the light passing through the dimming structure 20 is in a direct state. That is, when the dimming structure 20 is in narrow viewing angle mode, the display device presents a narrow viewing angle state in both the first and second directions.

[0085] In narrow viewing angle mode, the dimming structure 20 is transparent, i.e., in transmission mode. The voltage difference between the first electrode 211 and the second electrode 221 is greater than a second preset value, making the polymer liquid crystal layer 23 transparent, so that the light does not change its emission angle after passing through the dimming structure 20. Moreover, the transparency of the dimming structure 20 can be adjusted by the voltage signal applied to the first electrode 211 and the second electrode 221, thereby adjusting the narrow viewing angle effect of the display device in the second direction.

[0086] As for the screen display control box 30 applying a normal grayscale driving signal, the common electrode 321 applying a common signal, and the pixel electrode 322 applying a grayscale signal of 0-255, the screen display control box 30 can control the normal screen display.

[0087] Table 1:

[0088]

[0089] Table 1 above shows the simulation data of the viewing angle changing with the pressure difference between the first electrode 211 and the second electrode 221. Figure 6 As shown in Table a, when the voltage difference between the first electrode 211 and the second electrode 221 is 0V, the relative center brightness at a 45° viewing angle is 8.81% / 8.97% / 0.67% / 0.6% for the left / right / up / down sides; (Based on Table 1 and...) Figure 6 As shown in b, when the voltage difference between the first electrode 211 and the second electrode 221 is 5V, the relative center brightness at a 45° viewing angle is 5.49% / 5.51% / 0.54% / 0.48% for the left / right / up / down sides; (Based on Table 1 and...) Figure 7As can be seen from Table a, when the voltage difference between the first electrode 211 and the second electrode 221 is 10V, the relative center brightness at a 45° viewing angle is 1.23% / 1.2% / 0.31% / 0.26% for the left / right / up / down sides; (from Table 1 and...) Figure 7 As shown in b, when the voltage difference between the first electrode 211 and the second electrode 221 is 20V, the relative center brightness at a 45° viewing angle is 0.65% / 0.61% / 0.28% / 0.24% for the left / right / up / down sides. Furthermore, relative to the 20V voltage difference, the smaller the voltage difference between the first electrode 211 and the second electrode 221, the larger the outward expansion angle, i.e., the wider the viewing angle. That is, the larger the voltage difference between the first electrode 211 and the second electrode 221, the better the privacy protection effect. Moreover, this effect can be adjusted by the voltage signal applied to the first electrode 211 and the second electrode 221, thereby allowing the narrow viewing angle effect of the display device in the second direction to be adjusted.

[0090] Although the first electrode 211 and the second electrode 221 can control the transparency of the polymer liquid crystal layer 23, the transmittance of the dimming structure 20 also changes with the transparency of the polymer liquid crystal layer 23. For example... Figure 8 and Figure 9 As shown, the smaller the pressure difference between the first electrode 211 and the second electrode 221, the more the polymer liquid crystal layer 23 appears hazy, but the lower the light transmittance of the dimming structure 20 will be. Therefore, when the dimming structure 20 controls the viewing angle, the brightness of the display device will also be affected.

[0091] In this embodiment, the driving method further includes: the backlight module 40 adjusting its luminous brightness according to the transmittance of the dimming structure 20 to control the center brightness of the display device to remain within a preset range. By controlling the luminous brightness of the backlight module 40, the influence of the dimming structure 20 on the brightness of the display device is offset. Figure 10 As shown, when the viewing angle control signal H is A / B / C / D, the corresponding privacy viewing angles are ≥45° / ≥55° / ≥65° / ≥75°, respectively, and the corresponding currents applied to the backlight module 40 are a / b / c / d, where a < b < c < d. In other words, the larger the viewing angle range of the dimming structure 20, the greater the luminous brightness of the backlight module 40, thereby offsetting the influence of the dimming structure 20 on the brightness of the display device and ensuring that the center brightness of the display device remains within a preset range.

[0092] [Example 2]

[0093] Figure 11 This is a schematic diagram of the display device in Embodiment 2 of the present invention at a wide viewing angle. Figure 12 This is a schematic diagram of the display device in Embodiment 2 of the present invention at a narrow viewing angle. Figure 11 and Figure 12As shown, the view-switching display device and its driving method provided in Embodiment 2 of the present invention are similar to those in Embodiment 1. Figures 1 to 10 The view-switching display device and its driving method are basically the same as those in the previous embodiment. The difference is that in this embodiment, the first privacy film 11, the screen display control box 30, the dimming structure 20, the second privacy film 12 and the backlight module 40 are stacked in sequence from top to bottom. That is, in this embodiment, the first privacy film 11 is placed on the side of the screen display control box 30 that is closer to the external environment.

[0094] Compared to Embodiment 1, this embodiment enhances the privacy protection effect in the first direction by placing the first privacy film 11 on the side of the display device closest to the external environment. Because the first liquid crystal layer 33 in the display control box 30 can affect the privacy protection effect of the first privacy film 11, placing the first privacy film 11 on the side of the display control box 30 closest to the external environment avoids the influence of the display control box 30 on the privacy protection effect of the first privacy film 11.

[0095] 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.

[0096] [Example 3]

[0097] Figure 13 This is a schematic diagram of the display device in Embodiment 3 of the present invention at a wide viewing angle. Figure 14 This is a schematic diagram of the display device in Embodiment 3 of the present invention at a narrow viewing angle. Figure 13 and Figure 14 As shown, the view-switching display device and its driving method provided in Embodiment 3 of the present invention are similar to those in Embodiment 1. Figures 1 to 10 The view-angle switchable display device and its driving method are basically the same as those in the previous embodiment. The difference is that in this embodiment, the first privacy film 11, the dimming structure 20, the second privacy film 12, the screen display control box 30, and the backlight module 40 are stacked in sequence. That is, in this embodiment, the first privacy film 11, the dimming structure 20, and the second privacy film 12 are all located on the side of the screen display control box 30 that is closer to the external environment.

[0098] Compared to Embodiment 1, this embodiment enhances the privacy protection effect in both the first and second directions by placing the first privacy film 11, the dimming structure 20, and the second privacy film 12 on the side of the display device closest to the external environment. This is because the first liquid crystal layer 33 in the screen display control box 30 can affect the privacy protection effect of the first privacy film 11 and the second privacy film 12. By placing the first privacy film 11, the dimming structure 20, and the second privacy film 12 on the side of the screen display control box 30 closest to the external environment, the influence of the screen display control box 30 on the privacy protection effect of the first privacy film 11 and the second privacy film 12 is avoided.

[0099] 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.

[0100] [Example 4]

[0101] Figure 15 This is a schematic diagram of the display device in Embodiment 4 of the present invention at a wide viewing angle. Figure 16 This is a schematic diagram of the display device in the fourth embodiment of the present invention at a narrow viewing angle. Figure 17 This is one of the three-dimensional structural schematic diagrams of the protrusion structure in Embodiment 4 of the present invention. Figure 18 This is the second three-dimensional structural schematic diagram of the protrusion structure in Embodiment 4 of the present invention. Figure 19 This is the third three-dimensional structural schematic diagram of the protruding structure in Embodiment 4 of the present invention. For example... Figures 15 to 19 As shown, the view-switching display device and its driving method provided in Embodiment 4 of the present invention are similar to those in Embodiment 1. Figures 1 to 10 Example 2 Figures 11 to 12 ) and Example 3 ( Figures 13 to 14The viewing angle switchable display device and its driving method are basically the same as those in the previous embodiment. The difference is that, in this embodiment, the dimming structure 20 includes a first substrate 21, a second substrate 22 disposed opposite to the first substrate 21, and a second liquid crystal layer 24 located between the first substrate 21 and the second substrate 22. The second liquid crystal layer 24 uses positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy. In the initial state, the positive liquid crystal molecules in the second liquid crystal layer 24 are aligned parallel to the first substrate 21 and the second substrate 22, and the alignment direction of the positive liquid crystal molecules on the side closer to the first substrate 21 is opposite to that on the side closer to the second substrate 22. Of course, the second liquid crystal layer 24 can also be vertically aligned. The first substrate 21 is provided with a first electrode 211, the second substrate 22 is provided with a second electrode 221 that cooperates with the first electrode 211, and the side of the second substrate 22 facing the second liquid crystal layer 24 is provided with a plurality of protrusion structures 222. The protrusion structure 222 is preferably made of a resin-type material with a refractive index n of 1.4 to 1.6. For example, the protrusion structure 222 can be made of planarization material (OC) with a refractive index of 1.56, which is close to the commonly used liquid crystal molecule no. The liquid crystal molecules in the second liquid crystal layer 24 can be liquid crystal molecules with ne = 1.7 and no = 1.56.

[0102] In scattering mode, the pressure difference between the first electrode 211 and the second electrode 221 is less than a first preset value, causing the second liquid crystal layer 24 to lie flat. At this time, the refractive index of the second liquid crystal layer 24 is greater than the refractive index of the raised structure 222, and it has a scattering effect; that is, the refractive index ne of the second liquid crystal layer 24 is greater than the refractive index n of the raised structure 222. In transmission mode, the pressure difference between the first electrode 211 and the second electrode 221 is greater than a second preset value, causing the second liquid crystal layer 24 to be in a vertical position. At this time, the refractive index of the second liquid crystal layer 24 is equal to the refractive index of the raised structure 222; that is, the refractive index no of the second liquid crystal layer 24 is equal to the refractive index n of the raised structure 222.

[0103] Furthermore, the cross-sectional shape of the protrusion 222 is a semi-circular structure. Figure 17 ), triangular structure ( Figure 18 ) or trapezoidal structure ( Figure 19 The planar shape of the protruding structure 222 is a strip structure, that is, the protruding structure 222 is an inverted semi-cylinder, triangular prism or trapezoidal prism. The extension direction of the protruding structure 222 is parallel to the first direction.

[0104] This embodiment also provides a driving method for a display device, which is used to drive the display device as described above. The driving method includes:

[0105] like Figure 15As shown, in the narrow viewing angle mode in the first direction and the wide viewing angle mode in the second direction, the dimming structure 20 is controlled to be in a scattering mode in the second direction, and the light passing through the dimming structure 20 is in a diverging state. That is, when the dimming structure 20 is in the wide viewing angle mode, the display device is in a narrow viewing angle state in the first direction and a wide viewing angle state in the second direction.

[0106] In wide-viewing-angle mode, the dimming structure 20 is in a scattering state. The voltage difference between the first electrode 211 and the second electrode 221 is less than a first preset value, causing the second liquid crystal layer 24 to lie flat. The first electrode 211 and the second electrode 221 may be without a voltage signal or with a voltage signal of small voltage difference. At this time, the refractive index of the second liquid crystal layer 24 is greater than the refractive index of the protrusion structure 222 and has a scattering effect; that is, the refractive index ne of the second liquid crystal layer 24 is greater than the refractive index n of the protrusion structure 222. Furthermore, the degree of scattering by the dimming structure 20 can be adjusted by the voltage signal applied to the first electrode 211 and the second electrode 221, thereby allowing the wide-viewing-angle effect of the display device to be adjusted.

[0107] like Figure 16 As shown, in the all-around narrow viewing angle mode, the dimming structure 20 is controlled to be in transmission mode in the second direction, and the light passing through the dimming structure 20 is in a direct state. That is, when the dimming structure 20 is in narrow viewing angle mode, the display device presents a narrow viewing angle state in both the first and second directions.

[0108] In narrow viewing angle mode, the dimming structure 20 is in a direct-view state, i.e., transmission mode. The pressure difference between the first electrode 211 and the second electrode 221 is greater than a second preset value, causing the second liquid crystal layer 24 to be in a vertical state. The refractive index of the second liquid crystal layer 24 is equal to the refractive index of the raised structure 222, that is, at this time, the refractive index no of the second liquid crystal layer 24 is equal to the refractive index n of the raised structure 222, and the light passing through the dimming structure 20 basically does not change the emission angle.

[0109] As for the screen display control box 30 applying a normal grayscale driving signal, the common electrode 321 applying a common signal, and the pixel electrode 322 applying a grayscale signal of 0-255, the screen display control box 30 can control the normal screen display.

[0110] Table 2:

[0111]

[0112] Table 2 above shows the simulation data of the viewing angle changing with the pressure difference between the first electrode 211 and the second electrode 221. Figure 20As can be seen from Table a, when the voltage difference between the first electrode 211 and the second electrode 221 is 0V, the relative center brightness at a 45° viewing angle is 1.75% / 1.64% / 0.14% / 0.15% for the left / right / up / down sides; (from Table 1 and...) Figure 20 As shown in b, when the voltage difference between the first electrode 211 and the second electrode 221 is 5V, the relative center brightness at a 45° viewing angle is 0.53% / 0.46% / 0.12% / 0.13% for the left / right / up / down sides; (Based on Table 1 and...) Figure 21 As can be seen from Table a, when the voltage difference between the first electrode 211 and the second electrode 221 is 10V, the relative center brightness at a 45° viewing angle is 0.45% / 0.42% / 0.12% / 0.13% for the left / right / up / down sides; (from Table 1 and...) Figure 21 As shown in b, when the voltage difference between the first electrode 211 and the second electrode 221 is 20V, the relative center brightness on the left / right / top / bottom at a 45° viewing angle is 0.35% / 0.3% / 0.12% / 0.13% respectively. Furthermore, relative to the 20V voltage difference, the smaller the voltage difference between the first electrode 211 and the second electrode 221, the larger the outward expansion angle, i.e., the wider the viewing angle. That is, the larger the voltage difference between the first electrode 211 and the second electrode 221, the better the privacy protection effect. Moreover, this effect can be adjusted by the voltage signal applied to the first electrode 211 and the second electrode 221, thereby allowing the narrow viewing angle effect of the display device in the second direction to be adjusted.

[0113] Although the first electrode 211 and the second electrode 221 can control the refractive index of the second liquid crystal layer 24, the transmittance of the dimming structure 20 also changes with the refractive index of the second liquid crystal layer 24. The smaller the pressure difference between the first electrode 211 and the second electrode 221, the more the second liquid crystal layer 24 lies flat, the worse the light-gathering effect of the dimming structure 20 is, and the lower the transmittance of the dimming structure 20 will be. Therefore, when the dimming structure 20 controls the viewing angle, the brightness of the display device will also be affected.

[0114] In this embodiment, the driving method further includes: the backlight module 40 adjusting its luminous brightness according to the transmittance of the dimming structure 20 to control the center brightness of the display device to remain within a preset range. By controlling the luminous brightness of the backlight module 40, the influence of the dimming structure 20 on the brightness of the display device is offset. (Reference) Figure 10 As shown, when the viewing angle control signals H are A / B / C / D, the corresponding privacy viewing angles are ≥45° / ≥55° / ≥65° / ≥75°, respectively, and the corresponding currents applied to the backlight module 40 are a / b / c / d, where a < b < c < d. In other words, the larger the viewing angle range of the dimming structure 20, the greater the luminous brightness of the backlight module 40, thereby offsetting the influence of the dimming structure 20 on the brightness of the display device and ensuring that the center brightness of the display device remains within a preset range.

[0115] 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, Embodiment 2 and Embodiment 3, and will not be repeated here.

[0116] [Example 5]

[0117] Figure 22 This is a schematic diagram of the display device in Embodiment 5 of the present invention at a wide viewing angle. Figure 23 This is a schematic diagram of the display device in Embodiment 5 of the present invention at a narrow viewing angle. The viewing angle-swappable display device and its driving method provided in Embodiment 5 of the present invention are similar to those in Embodiment 1. Figures 1 to 10 Example 2 Figures 11 to 12 Example 3 Figures 13 to 14 ) and Example 1 ( Figures 15 to 21 The viewing angle switchable display device and its driving method in b) are basically the same. The difference is that in this embodiment, the screen display control box 30 adopts a light-emitting diode display panel, such as an OLED display panel or a Micro LED display panel (micro light-emitting diode) technology. The Micro LED display panel is a technology of miniaturizing and matrixing LEDs. Compared with the liquid crystal display panel, the light-emitting diode display panel has self-emissive characteristics, a wide viewing angle, and high color saturation, which can improve the display effect when displaying at wide and narrow viewing angles. Since the light-emitting diode display panel has a self-emissive function, there is no need to set a backlight module 40. The screen display control box 30 is located below the second privacy film 12. The first privacy film 11, the dimming structure 20, and the second privacy film 12 are all located on the light-emitting side of the screen display control box 30. The first privacy film 11, the dimming structure 20, the second privacy film 12, and the screen display control box 30 are stacked sequentially from top to bottom.

[0118] The display control box 30 includes a driving substrate 34, a plurality of light-emitting diodes (LEDs) 35 disposed on the driving substrate 34, and a protective layer 36 covering the plurality of LEDs 35. The driving substrate 34 is used to control the plurality of LEDs 35 to display different gray levels. The plurality of LEDs 35 are arranged in an array on the driving substrate 34, and each LED 35 is a sub-pixel. For a more detailed structure of the LED display panel, please refer to the prior art, which will not be elaborated here.

[0119] This embodiment also provides a driving method for a display device, which is used to drive the display device as described above. The driving method includes:

[0120] like Figure 22As shown, in the narrow viewing angle mode in the first direction and the wide viewing angle mode in the second direction, the dimming structure 20 is controlled to be in a scattering mode in the second direction, and the light passing through the dimming structure 20 is in a diverging state. That is, when the dimming structure 20 is in the wide viewing angle mode, the display device is in a narrow viewing angle state in the first direction and a wide viewing angle state in the second direction.

[0121] In wide-viewing-angle mode, the dimming structure 20 is in a scattering state. The voltage difference between the first electrode 211 and the second electrode 221 is less than a first preset value, causing the polymer liquid crystal layer 23 to appear hazy and have a light-scattering effect. The first electrode 211 and the second electrode 221 may not have a voltage signal applied, or a voltage signal with a small voltage difference may be applied. This results in a better wide-viewing-angle effect for the display device, and the degree of scattering by the dimming structure 20 can be adjusted by the voltage signal applied to the first electrode 211 and the second electrode 221, thereby allowing the wide-viewing-angle effect of the display device in the second direction to be adjusted.

[0122] like Figure 23 As shown, in the all-around narrow viewing angle mode, the dimming structure 20 is controlled to be in transmission mode in the second direction, and the light passing through the dimming structure 20 is in a direct state. That is, when the dimming structure 20 is in narrow viewing angle mode, the display device presents a narrow viewing angle state in both the first and second directions.

[0123] In narrow viewing angle mode, the dimming structure 20 is transparent, i.e., in transmission mode. The voltage difference between the first electrode 211 and the second electrode 221 is greater than a second preset value, making the polymer liquid crystal layer 23 transparent, so that the light does not change its emission angle after passing through the dimming structure 20. Moreover, the transparency of the dimming structure 20 can be adjusted by the voltage signal applied to the first electrode 211 and the second electrode 221, thereby adjusting the narrow viewing angle effect of the display device in the second direction.

[0124] As for the screen display control box 30, it applies a normal grayscale driving signal and applies a grayscale signal of 0-255 through the light-emitting diode 35 of the driving substrate 34, so that the screen display control box 30 can control the normal screen display in the narrow viewing angle mode.

[0125] Although the first electrode 211 and the second electrode 221 can control the transparency of the polymer liquid crystal layer 23, the transmittance of the dimming structure 20 also changes with the transparency of the polymer liquid crystal layer 23. The smaller the pressure difference between the first electrode 211 and the second electrode 221, the more hazy the polymer liquid crystal layer 23 appears, but the lower the transmittance of the dimming structure 20 will be. Therefore, when the dimming structure 20 controls the viewing angle, the brightness of the display device will also be affected.

[0126] In this embodiment, the driving method further includes: the screen display control box 30 adjusting the luminous brightness according to the transmittance of the dimming structure 20 to control the center brightness of the display device to remain within a preset range. By controlling the luminous brightness of the screen display control box 30, the influence of the dimming structure 20 on the brightness of the display device is offset. (Reference) Figure 10 As shown, when the viewing angle control signal H is A / B / C / D, the corresponding privacy viewing angles are ≥45° / ≥55° / ≥65° / ≥75°, respectively, and the corresponding currents applied to the backlight module 40 are a / b / c / d, where a < b < c < d. In other words, the larger the viewing angle range of the dimming structure 20, the greater the luminous brightness of the backlight module 40, thereby offsetting the influence of the dimming structure 20 on the brightness of the display device and ensuring that the center brightness of the display device remains within a preset range.

[0127] 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, Embodiment 2, Embodiment 3 and Embodiment 4, and will not be repeated here.

[0128] 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.

[0129] 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 viewing angle, characterized in that, It includes a first privacy film (11), a second privacy film (12), a dimming structure (20), and a screen display control box (30) stacked on top of each other; The first privacy film (11) has a range for reducing the angle of light emission in a first direction, and the second privacy film (12) has a range for reducing the angle of light emission in a second direction. The first direction and the second direction are perpendicular to each other. The first privacy film (11) is located on the upper side of the dimming structure (20), and the second privacy film (12) is located on the lower side of the dimming structure (20). The dimming structure (20) has a scattering mode and a transmission mode in the second direction, and can switch between the scattering mode and the transmission mode. In the scattering mode, the light passing through the dimming structure (20) is in a divergent state, and in the transmission mode, the light passing through the dimming structure (20) is in a direct state, so that the display device always has a narrow viewing angle in the first direction and realizes the switching between wide and narrow viewing angles in the second direction. The screen display control box (30) is used to control the grayscale of the screen display.

2. The view-switching display device according to claim 1, characterized in that, The display device further includes a backlight module (40) for providing a light source. The screen display control box (30) includes a color filter substrate (31), an array substrate (32) disposed opposite to the color filter substrate (31), and a first liquid crystal layer (33) located between the color filter substrate (31) and the array substrate (32). The color filter substrate (31) is provided with a first polarizer (51), and the array substrate (32) is provided with a second polarizer (52). The light transmission axes of the first polarizer (51) and the second polarizer (52) are perpendicular to each other.

3. The view-switching display device according to claim 2, characterized in that, The screen display control box (30), the first privacy film (11), the dimming structure (20), the second privacy film (12), and the backlight module (40) are stacked in sequence; Alternatively, the first privacy film (11), the screen display control box (30), the dimming structure (20), the second privacy film (12), and the backlight module (40) are stacked sequentially; Alternatively, the first privacy film (11), the dimming structure (20), the second privacy film (12), the screen display control box (30), and the backlight module (40) may be stacked in sequence.

4. The view-switching display device according to claim 1, characterized in that, The screen display control box (30) is located below the second privacy film (12). The screen display control box (30) includes a driving substrate (34), a plurality of light-emitting diodes (35) disposed on the driving substrate (34), and a protective layer (36) covering the plurality of light-emitting diodes (35). The driving substrate (34) is used to control the plurality of light-emitting diodes (35) to display different gray levels.

5. The view-switching display device according to any one of claims 1-4, characterized in that, The dimming structure (20) includes a first substrate (21), a second substrate (22) disposed opposite to the first substrate (21), and a polymer liquid crystal layer (23) located between the first substrate (21) and the second substrate (22). The first substrate (21) is provided with a first electrode (211), and the second substrate (22) is provided with a second electrode (221) that cooperates with the first electrode (211). In scattering mode, the polymer liquid crystal layer (23) is hazy and has a light-scattering effect; in transmission mode, the polymer liquid crystal layer (23) is transparent.

6. The view-switching display device according to claim 5, characterized in that, The polymer liquid crystal layer (23) includes polymer dispersed liquid crystal, polymer network liquid crystal, or polymer stabilized cholesteric phase liquid crystal.

7. The view-angle switchable display device according to any one of claims 1-4, characterized in that, The dimming structure (20) includes a first substrate (21), a second substrate (22) disposed opposite to the first substrate (21), and a second liquid crystal layer (24) located between the first substrate (21) and the second substrate (22). The first substrate (21) is provided with a first electrode (211), and the second substrate (22) is provided with a second electrode (221) cooperating with the first electrode (211). The second substrate (22) has a plurality of protrusion structures (222) on the side facing the second liquid crystal layer (24), and the protrusion structures (222) extend along the first direction. In scattering mode, the second liquid crystal layer (24) is in a flat state, and the refractive index of the second liquid crystal layer (24) is greater than the refractive index of the protrusion structure (222) and has a light-scattering effect; In transmission mode, the second liquid crystal layer (24) is in a vertical position, and the refractive index of the second liquid crystal layer (24) is equal to the refractive index of the protrusion structure (222).

8. The view-switching display device according to claim 7, characterized in that, The cross-sectional shape of the protrusion structure (222) is a semi-circular structure, a triangular structure, or a trapezoidal structure.

9. A driving method for a display device, characterized in that, The driving method is used to drive a display device as described in any one of claims 1-8, the display device including a backlight module (40) for providing a light source, the driving method comprising: In the narrow viewing angle mode in the first direction and the wide viewing angle mode in the second direction, the dimming structure (20) is controlled to be in the scattering mode in the second direction, and the light passing through the dimming structure (20) is in the diverging state; In the all-around narrow viewing angle mode, the dimming structure (20) is controlled to be in the transmission mode in the second direction, and the light passing through the dimming structure (20) is in the direct state; The backlight module (40) adjusts the light emission brightness according to the transmittance of the dimming structure (20) to control the center brightness of the display device to be maintained within a preset range.

10. A driving method for a display device, characterized in that, The driving method is used to drive the display device as described in any one of claims 1-8, wherein the screen display control box (30) is a self-emissive display panel and is located below the second privacy film (12), and the driving method includes: In the narrow viewing angle mode in the first direction and the wide viewing angle mode in the second direction, the dimming structure (20) is controlled to be in the scattering mode in the second direction, and the light passing through the dimming structure (20) is in the diverging state; In the all-around narrow viewing angle mode, the dimming structure (20) is controlled to be in the transmission mode in the second direction, and the light passing through the dimming structure (20) is in the direct state; The display control box (30) adjusts the light emission brightness according to the transmittance of the dimming structure (20) to control the center brightness of the display device to be maintained within a preset range.

Images