CN118112830A - Display device - Google Patents

Abstract

The invention provides a display device which is suitable for switching operation between a peep-proof mode and a sharing mode and comprises a backlight module, a display panel and an electric control visual angle switcher. The backlight module comprises a light guide plate, a light source, a view angle limiting sheet and an electric control diffusion film. The light guide plate is provided with a light incident surface and a light emergent surface connected with the light incident surface. The light source is arranged at one side of the light incident surface of the light guide plate. The view angle limiting piece is arranged on one side of the light emitting surface of the light guide plate. The automatically controlled diffusion film sets up on the visual angle limiting film, and visual angle limiting film is located between light guide plate and automatically controlled diffusion film. The display panel and the electrically controlled visual angle switcher are arranged on the electrically controlled diffusion film. When the display device is operated in the peep-proof mode, the display device has a first light-emitting brightness in the front view direction. When the display device is operated in the sharing mode, the display device has a second light-emitting luminance in the front view direction. The percentage value of the second light-emitting luminance to the first light-emitting luminance is in the range of 53% to 98%.

Description

Display device

Technical Field

The present disclosure relates to display technologies, and in particular, to a display device.

Background

Generally, a display device has a wide viewing angle for viewing by multiple viewers. However, in some occasions or situations, for example, when browsing private web pages, confidential information or inputting passwords in public places, the display effect of a wide viewing angle easily causes the screen to be peeped by other people, so that the confidential information is leaked.

In order to achieve the peep-proof effect, a display device with a collimation type backlight module and an electric control visual angle switcher is provided. However, the peep-proof effect of such a display device may deteriorate as the size of the display panel increases. Another display device having a light control film (Light Control Film, LCF) and an electrically controlled diffusion film is also provided. Although the display device has better peep-proof effect, the light energy utilization rate is poor. Therefore, how to make the display device have the peep-proof effect and the light energy utilization rate is still a problem yet to be solved.

Disclosure of Invention

The invention is directed to a display device with better peep-proof effect and better light energy utilization rate in a sharing mode.

According to an embodiment of the invention, the display device is suitable for switching operation between a peep-proof mode and a sharing mode, and comprises a backlight module, a display panel and an electric control visual angle switcher. The backlight module comprises a light guide plate, a light source, a view angle limiting sheet and an electric control diffusion film. The light guide plate is provided with a light incident surface and a light emergent surface connected with the light incident surface. The light source is arranged at one side of the light incident surface of the light guide plate. The view angle limiting piece is arranged on one side of the light emitting surface of the light guide plate. The automatically controlled diffusion film sets up on the visual angle limiting film, and visual angle limiting film is located between light guide plate and automatically controlled diffusion film. The display panel and the electrically controlled visual angle switcher are arranged on the electrically controlled diffusion film. When the display device is operated in the peep-proof mode, the display device has a first light-emitting brightness in the front view direction. When the display device is operated in the sharing mode, the display device has a second light-emitting luminance in the front view direction. The percentage value of the second light-emitting luminance to the first light-emitting luminance is in the range of 53% to 98%.

In the display device according to the embodiment of the invention, when the display device is operated in the peep-proof mode, the electrically controlled viewing angle switcher is in an on state. When the display device is operated in the sharing mode, the electric control visual angle switcher is in a closed state.

In the display device according to the embodiment of the invention, the electrically controlled diffusion film has a first haze value when the display device is operated in the peep-proof mode. When the display device is operated in the sharing mode, the electrically controlled diffusion film has a second haze value. The ratio of the second haze value to the first haze value is in the range of 1.5 to 18.

In the display device according to the embodiment of the invention, when the display device is operated in the sharing mode, the electrically controlled diffusion film is in an on state.

In the display device according to the embodiment of the invention, the electrically controlled diffusion film includes a polymer dispersed liquid crystal layer, a first electrode layer, and a second electrode layer. The polymer dispersed liquid crystal layer is positioned between the first electrode layer and the second electrode layer. When the display device is operated in the peep-proof mode, a first voltage is applied between the first electrode layer and the second electrode layer. When the display device is operated in the sharing mode, a second voltage is applied between the first electrode layer and the second electrode layer. The percentage value of the second voltage to the first voltage is in the range of 21% to 63%.

In the display device according to the embodiment of the invention, the second voltage is greater than 0V.

In a display device according to an embodiment of the present invention, an electronically controlled viewing angle switcher includes a liquid crystal layer, a first electrode, a second electrode, and a polarizer. The first electrode and the second electrode are arranged on at least one side of the liquid crystal layer. The polaroid is arranged on one side of the liquid crystal layer, which is away from the display panel.

In the display device according to the embodiment of the invention, the display panel is positioned between the electrically controlled viewing angle switcher and the backlight module.

In the display device according to the embodiment of the invention, the electrically controlled viewing angle switcher is located between the display panel and the backlight module.

In the display device according to the embodiment of the invention, the backlight module further comprises a first prism sheet and a second prism sheet. The first prism sheet is arranged between the light guide plate and the view angle limiting sheet and is provided with a plurality of first prism structures. The second prism sheet is arranged between the first prism sheet and the light guide plate and is provided with a plurality of second prism structures. The extending direction of the first prism structures is perpendicular to the extending direction of the second prism structures.

In the display device according to an embodiment of the present invention, the backlight module further includes a diffusion sheet disposed between the viewing angle limiting sheet and the first prism sheet.

Based on the above, in the display device according to an embodiment of the invention, the viewing angle limiting sheet disposed on the backlight module can make the display device have a better peep preventing effect when operating in the peep preventing mode. When the display device is switched to the sharing mode, a user can adjust the haze value of the electric control diffusion film in a segmented mode according to the required front view angle brightness so as to achieve the better light energy utilization rate.

Drawings

FIG. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic diagram of the electrically controlled viewing angle switcher of FIG. 1;

FIG. 3 is an enlarged schematic view of the electronically controlled diffusion membrane of FIG. 1;

FIG. 4 is a schematic view of the first prism sheet and the second prism sheet of FIG. 1;

FIG. 5 is a graph showing luminance versus viewing angle distribution of the display device of FIG. 1 in a privacy mode and various sharing modes;

Fig. 6 is a schematic cross-sectional view of a display device according to another embodiment of the present invention.

Description of the reference numerals

10. 10A: a display device;

100: a backlight module;

110: an electrically controlled diffusion membrane;

111. 112, 201, 202, 301, 302: a substrate;

113: a first electrode layer;

114: a second electrode layer;

115: a polymer dispersed liquid crystal layer;

130: view angle limiting tablets;

150: a diffusion sheet;

171: a first prism sheet;

171S, 173S: a light-transmitting substrate;

171P: a first prism structure;

173: a second prism sheet;

173P: a second prism structure;

180: a reflection sheet;

200: a display panel;

220. 320: a liquid crystal layer;

300. 300A: an electronically controlled viewing angle switcher;

313: a first electrode;

314: a second electrode;

410: a circuit flexible board;

450: a circuit board;

BF: a back frame member;

BS: a bottom surface;

ES: a light-emitting surface;

GF: a rubber frame member;

IS: a light incident surface;

LGP: a light guide plate;

LS: a light source;

P1, S2, S3, S4: a curve;

POL1, POL2, POL3: a polarizer;

X, Y, Z: direction.

Detailed Description

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention. Fig. 2 is an enlarged schematic view of the electronically controlled viewing angle switcher of fig. 1. Fig. 3 is an enlarged schematic view of the electronically controlled diffusion membrane of fig. 1. Fig. 4 is a schematic view of the first prism sheet and the second prism sheet of fig. 1. Fig. 5 is a graph showing luminance versus viewing angle distribution of the display device of fig. 1 in a peep-proof mode and various sharing modes. Fig. 6 is a schematic cross-sectional view of a display device according to another embodiment of the present invention. For clarity of presentation, fig. 1 does not show the first electrode 313 and the second electrode 314 of fig. 2.

Referring to fig. 1, the display device 10 includes a backlight module 100, a display panel 200, and an electrically controlled viewing angle switcher 300. The backlight module 100 includes a light guide plate LGP, a light source LS, an electronically controlled diffusion film 110, and a viewing angle limiting sheet 130. The light guide plate LGP has a light incident surface IS and a light emergent surface ES connected to the light incident surface IS. The light source LS IS disposed at one side of the light incident surface IS of the light guide plate LGP. The viewing angle limiting sheet 130 is disposed at one side of the light emitting surface ES of the light guide plate LGP. The electronically controlled diffusion film 110 is disposed on the viewing angle limiting sheet 130. That is, the viewing angle limiting sheet 130 is positioned between the light guide plate LGP and the electronically controlled diffusion film 110.

For example, in the present embodiment, the backlight module 100 further optionally includes a diffusion sheet 150, a first prism sheet 171, and a second prism sheet 173. The first prism sheet 171 is disposed between the light guide plate LGP and the viewing angle restricting sheet 130. The second prism sheet 173 is disposed between the first prism sheet 171 and the light guide plate LGP. The diffusion sheet 150 is disposed between the viewing angle limiting sheet 130 and the first prism sheet 171. That is, the backlight module 100 of the present embodiment is a collimated (or concentrated) backlight.

Referring to fig. 1 and 4, in detail, the first prism sheet 171 has a light-transmitting substrate 171S and a plurality of first prism structures 171P. The second prism sheet 173 has a light-transmitting substrate 173S and a plurality of second prism structures 173P. These first prism structures 171P may be aligned along the direction Y and extend in the direction X. The second prism structures 173P may be aligned along the direction X and extend in the direction Y. In this embodiment, the direction X may be perpendicular to the direction Y. That is, the extending direction (e.g., direction X) of the plurality of first prism structures 171P of the first prism sheet 171 is perpendicular to the extending direction (e.g., direction Y) of the plurality of second prism structures 173P of the second prism sheet 173. In the present embodiment, the extending direction of the plurality of second prism structures 173P of the second prism sheet 173 may be perpendicular to the light incident surface IS of the light guide plate LGP, i.e., the extending direction of the plurality of first prism structures 171P of the first prism sheet 171 may be parallel to the light incident surface IS of the light guide plate LGP.

In this embodiment, the viewing angle limiting sheet 130 may be a 3M light control film (Light Control Film, LCF) or other louver film sheet (Louver Film) having a viewing angle limiting function. Since the viewing angle limiting sheet 130 allows only light rays within a specific viewing angle range (e.g., near a positive viewing angle) to pass through, the light collecting characteristics of the first prism sheet 171 and the second prism sheet 173 can increase the peep-proof effect of the display device 10, and can greatly reduce the light energy absorbed by the viewing angle limiting sheet 130 to increase the light energy utilization rate of the backlight module 100.

On the other hand, in order to further increase the light energy utilization rate of the light source LS, the light guide plate LGP may further be provided with a reflective sheet 180 on a side of the bottom surface BS facing away from the light emitting surface ES, so that the light emitted from the bottom surface BS of the light guide plate LGP is reflected back to the light guide plate LGP.

In the present embodiment, the display panel 200 and the electrically controlled viewing angle switcher 300 are disposed on the electrically controlled diffusion film 110, and the display panel 200 is located between the electrically controlled viewing angle switcher 300 and the backlight module 100, but not limited thereto. In another embodiment, the electrically controlled viewing angle switcher 300A of the display device 10A may also be disposed between the display panel 200 and the electrically controlled diffusion film 110 of the backlight module 100 (as shown in fig. 6). For example, the backlight module 100 may further include a back frame BF and a glue frame GF. The back frame member BF has a receiving space, and the light guide plate LGP, the light source LS, the electronically controlled diffusion film 110, and the viewing angle restricting sheet 130 are stacked in the receiving space along the direction Z. The frame member GF is disposed on opposite sides of the electrically controlled diffusion film 110 along at least one direction and configured to receive the display panel 200 and the electrically controlled viewing angle switcher 300. In the present embodiment, the frame member GF may be disposed around the electrically controlled diffusion film 110, but is not limited thereto.

The display panel 200 is, for example, a liquid crystal display panel, and may include a substrate 201, a substrate 202, a liquid crystal layer 220, a polarizer POL1 and a polarizer POL2. The liquid crystal layer 220 is sandwiched between the substrates 201 and 202. The polarizer POL1 is disposed at a side of the substrate 201 facing away from the liquid crystal layer 220. The polarizer POL2 is disposed on a side of the substrate 202 facing away from the liquid crystal layer 220. For example, the substrate 201 may be a pixel array substrate, and the substrate 202 may be a color film substrate. Since the detailed structures of the pixel array substrate and the color film substrate can be realized by any of the pixel array substrate and the color film substrate known in the field of liquid crystal display, the detailed structures of the pixel array substrate and the color film substrate are not repeated herein or limited.

In the present embodiment, the circuit board 410 may be bonded to the peripheral region of the substrate 201, and the other end of the circuit board 410 may be electrically coupled to the circuit board 450. More specifically, the circuit board 450 may provide source driving signals and/or gate driving signals to pixel structures (not shown) of the display area via peripheral lines (not shown) on the circuit board 410 and the substrate 201.

Since the display panel 200 of the present embodiment can be implemented in any liquid crystal display mode known in the field of liquid crystal displays, for example: a twisted nematic (TWISTED NEMATIC, TN) mode, a vertical alignment (VERTICAL ALIGNED, VA) mode, a coplanar switching (In-PLANE SWITCHING, IPS) mode, a Fringe-field switching (Fringe-FILED SWITCHING, FFS) mode, an electrically controlled birefringence (ELECTRICALLY CONTROLLED BIREFRINGENCE, ECB) mode, or an optically compensated bend (Optically Compensated Bend, OCB) mode, the detailed structure of the display panel 200 is not repeated herein nor limited. However, the present invention is not limited thereto. In other embodiments, other suitable non-self-emissive display panels may be used for the display panel.

In this embodiment, the electrically controlled viewing angle switcher 300 is configured to enable the display device 10 to switch between the peep-proof mode and the sharing mode, i.e. the peep-proof effect of the display device 10 is electrically switchable. Referring to fig. 1 and 2, the electrically controlled viewing angle switcher 300 is, for example, an electrically controlled liquid crystal cell, and includes a substrate 301, a substrate 302, a liquid crystal layer 320, a first electrode 313, a second electrode 314, and a polarizer POL3. The liquid crystal layer 320 is sandwiched between the substrates 301 and 302. The first electrode 313 and the second electrode 314 may be disposed on the substrate 301 and the substrate 302, but not limited thereto. In other embodiments, the first electrode 313 and the second electrode 314 may be disposed on the same substrate (e.g., the substrate 301) according to a driving mode (e.g., an in-plane switching IPS mode or a fringe field switching FFS mode) of the liquid crystal layer 320, i.e., the first electrode 313 and the second electrode 314 may be disposed on at least one side of the liquid crystal layer 320. The material of the first electrode 313 and the second electrode 314 is, for example, a metal oxide, which may include indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxide, or a stacked layer of at least two of the foregoing.

Since the display panel 200 of the present embodiment is provided with the polarizer POL2 on the side of the substrate 202 facing the electrically controlled viewing angle switcher 300, the electrically controlled viewing angle switcher 300 and the display panel 200 of the present embodiment can share the polarizer POL2. Therefore, the electrically controlled viewing angle switcher 300 does not need to provide an additional polarizer on one side of the display panel 200, but only provides the polarizer POL3 on the side facing away from the display panel 200, which is not limited thereto. Specifically, in the display device 10A of fig. 6, since the electrically controlled viewing angle switcher 300A is located between the display panel 200 and the backlight module 100, the polarizer POL3 is disposed on the side of the electrically controlled viewing angle switcher 300A facing the backlight module 100, unlike the polarizer POL3 of fig. 1, which is disposed on the side of the electrically controlled viewing angle switcher 300 facing away from the backlight module 100.

Since the axial relative relationship between the light transmission axes (or absorption axes) of the polarizers POL1, POL2, and POL3 of the present embodiment depends on the respective operation modes of the liquid crystal layer 220 and the liquid crystal layer 320, the present invention is not limited. For example, when the liquid crystal layer 220 of the display panel 200 and the liquid crystal layer 320 of the electronically controlled viewing angle switcher 300 are driven in the TN mode, the light transmission axis of the polarizer POL1 may be perpendicular to the light transmission axis of the polarizer POL2 and parallel to the light transmission axis of the polarizer POL3, but not limited thereto.

In the present embodiment, the electrically controlled viewing angle switcher 300 can be electrically coupled to the circuit board 410 and the circuit board 450. That is, the circuit board 450 of the present embodiment is further configured to provide driving signals to the electronically controlled viewing angle switcher 300. For example, when the electrically controlled viewing angle switch 300 is in an on state, the display device 10 is operated in the peep-proof mode, and when the electrically controlled viewing angle switch 300 is in an off state, the display device 10 is operated in the sharing mode, but not limited thereto.

On the other hand, referring to fig. 1 and 3, the electrically controlled diffusion film 110 may include a substrate 111, a substrate 112, a polymer dispersed liquid crystal layer 115, a first electrode layer 113 and a second electrode layer 114. The polymer dispersed liquid crystal layer 115 is provided between the substrate 111 and the substrate 112. The first electrode layer 113 is disposed on the substrate 111 and is located between the substrate 111 and the polymer dispersed liquid crystal layer 115. The second electrode layer 114 is disposed on the substrate 112 and is located between the substrate 112 and the polymer dispersed liquid crystal layer 115. The materials of the first electrode layer 113 and the second electrode layer 114 are, for example, metal oxides, which may include indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxides, or a stacked layer of at least two of the foregoing.

When the display device 10 is operated in the peep-proof mode (e.g. when the electrically controlled viewing angle switcher 300 is in an on state), a first voltage is applied between the first electrode layer 113 and the second electrode layer 114 of the electrically controlled diffusion film 110 to have a first haze value. When the display device 10 is operated in the sharing mode (e.g., the electrically controlled viewing angle switcher 300 is in the off state), a second voltage is applied between the first electrode layer 113 and the second electrode layer 114 of the electrically controlled diffusion film 110 to have a second haze value. It is particularly noted that the ratio of the second haze value of the electrically controlled diffusion film 110 in the sharing mode to the first haze value thereof in the peep preventing mode is in the range of 1.5 to 18, and the percentage value of the second voltage applied to the two electrode layers in the sharing mode to the first voltage applied to the two electrode layers in the peep preventing mode is in the range of 21% to 63%.

More specifically, when the display device 10 is operated in the sharing mode, the second voltage applied between the first electrode layer 113 and the second electrode layer 114 can be adjusted in a segmented manner, so that the electrically controlled diffusion film 110 has an adjustable haze value. Therefore, the user can change the front-view luminance of the display device 10 in the sharing mode by adjusting the haze value of the electrically controlled diffusion film 110, so as to improve the light energy utilization rate of the display device 10 in the sharing mode.

For example, when the display device 10 is operated in the peep-proof mode, the distribution of the brightness of the light emitted to the viewing angle is shown as a curve P1 in fig. 5. When the display device 10 is operated in the sharing mode and the second voltages applied to the two electrode layers of the electrically controlled diffusion film 110 are 0V, 5V, 10V and 15V, the distribution relationship of the luminance of the display device 10 with respect to the viewing angle is shown as the curves S1, S2, S3 and S4 in fig. 5, respectively. As can be seen from the graph of fig. 5, when the display device 10 is operated in the peep-proof mode, the brightness in the front viewing direction (i.e. viewing angle 0 °) thereof (i.e. the first light-emitting brightness) is the maximum (e.g. 225 nit); when the display device 10 is operated in the sharing mode, the luminance in the front view direction (i.e. the second light emitting luminance) will be changed according to the applied voltages of the two electrode layers of the electrically controlled diffusion film 110, as shown in table one.

List one

Since the haze value of the electrically controlled diffusion film 110 decreases as the applied voltage of the two electrode layers increases, the luminance of the display device 10 at viewing angle 0 degree (i.e., positive viewing angle) increases as the haze value of the electrically controlled diffusion film 110 decreases. In the present embodiment, the percentage value of the second light-emitting luminance of the display device 10 in the sharing mode to the first light-emitting luminance of the display device in the peep-proof mode is in the range of 53% to 98%.

For example, when the display device 10 is operated in the sharing mode, the electrically controlled diffusion film 110 may be in an off state (e.g., voltage 0V). At this time, the range of the viewing angle of the display device 10 is maximum, but the light-emitting luminance at the front viewing angle is also significantly low (e.g., 120 nits). If the user wants to increase the positive angular luminance, the electrically controlled diffusion film 110 may be turned on, for example, by turning on the electrically controlled diffusion film 110 at 5V. At this time, the viewing angle range of the display device 10 is slightly reduced, but the front-view luminance can be increased to 160 nits (as shown in fig. 5 and table one). If the applied voltage of the electrically controlled diffusion film 110 is further increased to 10V, the viewing angle range of the display device 10 is significantly reduced, but the front viewing angle brightness is greatly increased to 210 nit.

That is, when the display device 10 is operated in the sharing mode, the user may trade off the desired positive viewing angle luminance with the viewing angle range to determine whether to turn off or turn on the electrically controlled diffusion film 110 with a voltage of, for example, less than 15V. Unlike the conventional or known display device that closes the electrically controlled diffusion film in the sharing mode, the display device 10 of the present embodiment not only has better operation flexibility, but also has both anti-peeping effect and light energy utilization rate.

In summary, in the display device according to the embodiment of the invention, the viewing angle limiting sheet disposed on the backlight module can make the display device have a better peep-proof effect when operating in the peep-proof mode. When the display device is switched to the sharing mode, a user can adjust the haze value of the electric control diffusion film in a segmented mode according to the required positive angle brightness and maintain the better light energy utilization rate.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (11)

1. A display device adapted to switch between a privacy mode and a sharing mode, the display device comprising:

A backlight module, comprising:

The light guide plate is provided with a light incident surface and a light emergent surface connected with the light incident surface;

a light source arranged on one side of the light incident surface of the light guide plate;

The view angle limiting sheet is arranged on one side of the light emitting surface of the light guide plate; and

The electronic control diffusion film is arranged on the visual angle limiting sheet, and the visual angle limiting sheet is positioned between the light guide plate and the electronic control diffusion film;

The display panel is arranged on the electric control diffusion film; and

The electronic control visual angle switcher is arranged on the electronic control diffusion film, wherein when the display device is operated in the peep-proof mode, the display device has a first light-emitting brightness in the front view direction, and when the display device is operated in the sharing mode, the display device has a second light-emitting brightness in the front view direction, and the percentage value of the second light-emitting brightness to the first light-emitting brightness is in the range of 53-98%.

2. The display device of claim 1, wherein the electronically controlled viewing angle switcher is on when the display device is operating in the privacy mode and is off when the display device is operating in the sharing mode.

3. The display device of claim 1, wherein the electronically controlled diffusion film has a first haze value when the display device is operated in the privacy mode and a second haze value when the display device is operated in the sharing mode, the ratio of the second haze value to the first haze value being in the range of 1.5 to 18.

4. The display device of claim 1, wherein the electronically controlled diffusion membrane is in an on state when the display device is operating in the sharing mode.

5. The display device according to claim 1, wherein the electrically controlled diffusion film includes a polymer dispersed liquid crystal layer, a first electrode layer, and a second electrode layer, the polymer dispersed liquid crystal layer being located between the first electrode layer and the second electrode layer, a first voltage being applied between the first electrode layer and the second electrode layer when the display device is operated in the peep-preventing mode, and a second voltage being applied between the first electrode layer and the second electrode layer when the display device is operated in the sharing mode, a percentage value of the second voltage to the first voltage being in a range of 21% to 63%.

6. The display device according to claim 5, wherein the second voltage is greater than 0V.

7. The display device of claim 1, wherein the electronically controlled viewing angle switcher includes:

A liquid crystal layer;

a first electrode and a second electrode disposed on at least one side of the liquid crystal layer; and

And the polaroid is arranged on one side of the liquid crystal layer, which is away from the display panel.

8. The display device of claim 1, wherein the display panel is positioned between the electronically controlled viewing angle switcher and the backlight module.

9. The display device of claim 1, wherein the electronically controlled viewing angle switcher is positioned between the display panel and the backlight module.

10. The display device of claim 1, wherein the backlight module further comprises:

a first prism sheet disposed between the light guide plate and the viewing angle limiting sheet and having a plurality of first prism structures; and

The second prism sheet is arranged between the first prism sheet and the light guide plate and is provided with a plurality of second prism structures, wherein the extending directions of the plurality of first prism structures are perpendicular to the extending directions of the plurality of second prism structures.

11. The display device of claim 10, wherein the backlight module further comprises:

And a diffusion sheet disposed between the viewing angle limiting sheet and the first prism sheet.