Liquid crystal display panel and display device

Abstract

The utility model provides a liquid crystal display panel which comprises a display liquid crystal box, a dimming box and a backlight module which are arranged in a stacked mode, and the dimming box comprises a first substrate, a second substrate arranged opposite to the first substrate and a first liquid crystal layer arranged between the first substrate and the second substrate; a first polaroid is arranged on the first substrate, a second polaroid is arranged on the second substrate, and a light-transmitting axis of the first polaroid is parallel to a light-transmitting axis of the second polaroid; a first electrode is arranged on one side, close to the first liquid crystal layer, of the first substrate, and a second electrode matched with the first electrode is arranged on the second substrate; a first alignment layer is arranged on the side, close to the first liquid crystal layer, of the first substrate, and a second alignment layer is arranged on the side, close to the first liquid crystal layer, of the second substrate; the alignment direction of the first alignment layer is the same as that of the second alignment layer, and the included angle between the alignment direction of the first alignment layer and the light-transmitting axis of the first polaroid is 40-80 degrees or 100-140 degrees. The utility model further provides a display device.

Description

Technical Field

[0001] The utility model relates to the field of display technology, in particular to a liquid crystal display panel and a display device. Background Art

[0002] With the continuous advancement of liquid crystal display technology, the viewing angle of display devices has been widened from the original 112° to more than 160°. While enjoying the visual experience brought by the wide viewing angle, people also hope to effectively protect business secrets and personal privacy to avoid business losses or embarrassment caused by the leakage of screen information. Therefore, in addition to the demand for wide viewing angle, in many occasions, the display device is also required to have the function of switching between wide and narrow viewing angles.

[0003] In the prior art, there is a display device that uses a dimming box and a display panel to switch between a wide viewing angle and a narrow viewing angle. The display panel is used for normal picture display, and the dimming box is used to control the viewing angle switching. The dimming box includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate. The viewing angle control electrodes on the first substrate and the second substrate apply a vertical electric field to the liquid crystal molecules to deflect the liquid crystal in the vertical direction to achieve a narrow viewing angle mode; by controlling the voltage on the viewing angle control electrode, switching between a wide viewing angle and a narrow viewing angle can be achieved.

[0004] In certain specific situations, the display device needs to have a one-way anti-peeping function. For example, when the display device is a vehicle-mounted central control screen, in the narrow viewing angle mode, the co-pilot can play videos, while the driver cannot see the playback content to keep his attention focused. However, current display devices generally can only achieve left and right two-way anti-peeping (that is, in the narrow viewing angle mode, both the left and right sides of the display device have narrow viewing angles), and cannot achieve a narrow viewing angle in a single direction (such as left or right). Utility Model Content

[0005] The utility model aims to provide a liquid crystal display panel, which can not only realize the switching between wide and narrow viewing angles, but also realize one-way peeping prevention in a narrow viewing angle mode.

[0006] The utility model provides a liquid crystal display panel, comprising a stacked display liquid crystal box, a dimming box and a backlight module, wherein the display liquid crystal box and the dimming box are both located at the light-emitting side of the backlight module, and the dimming box is located at the light-incoming side or the light-emitting side of the display liquid crystal box; the dimming box comprises a first substrate, a second substrate arranged opposite to the first substrate, and a first liquid crystal layer arranged between the first substrate and the second substrate;

[0007] A first polarizer is provided on the first substrate, and a second polarizer is provided on the second substrate, and the transmittance axis of the first polarizer and the transmittance axis of the second polarizer are parallel to each other; a first electrode is provided on the side of the first substrate close to the first liquid crystal layer, and a second electrode matching the first electrode is provided on the second substrate; a first alignment layer is provided on the side of the first substrate close to the first liquid crystal layer, and a second alignment layer is provided on the side of the second substrate close to the first liquid crystal layer; the alignment direction of the first alignment layer is the same as the alignment direction of the second alignment layer, and the angle between the alignment direction of the first alignment layer and the transmittance axis of the first polarizer is 40° to 80° or 100° to 140°.

[0008] In one achievable manner, the angle of the light transmission axis of the first polarizer and the angle of the light transmission axis of the second polarizer are both 0°.

[0009] In one feasible manner, the display liquid crystal box includes a third substrate and a second liquid crystal layer, the third substrate is arranged opposite to the second substrate, the third substrate is located on the side of the second substrate away from the first substrate, and the second liquid crystal layer is arranged between the third substrate and the second substrate; a pixel electrode matching the second electrode is provided on the side of the third substrate close to the second liquid crystal layer, and the second electrode is arranged on the side of the second substrate close to the second liquid crystal layer.

[0010] In an achievable manner, the display liquid crystal box includes a third substrate and a second liquid crystal layer, the third substrate is arranged opposite to the second substrate, the third substrate is located on a side of the second substrate away from the first substrate, the second liquid crystal layer is arranged between the third substrate and the second substrate, and the second electrode is arranged on a side of the second substrate close to the first liquid crystal layer;

[0011] A pixel electrode is provided on a side of the second substrate close to the second liquid crystal layer, and a common electrode matching the pixel electrode is provided on a side of the third substrate close to the second liquid crystal layer; or, a pixel electrode is provided on a side of the third substrate close to the second liquid crystal layer, and a common electrode matching the pixel electrode is provided on a side of the second substrate close to the second liquid crystal layer.

[0012] In one feasible manner, the display liquid crystal box includes a third substrate, a fourth substrate arranged opposite to the third substrate, and a second liquid crystal layer arranged between the third substrate and the fourth substrate, a pixel electrode is provided on a side of the third substrate close to the second liquid crystal layer, and a common electrode matching the pixel electrode is provided on a side of the fourth substrate close to the second liquid crystal layer; the second electrode is provided on a side of the second substrate close to the first liquid crystal layer.

[0013] In one achievable manner, the second liquid crystal layer is a dye liquid crystal layer, and the dye liquid crystal layer includes liquid crystal molecules and dye liquid crystal molecules mixed with each other; and no polarizer is provided on a side of the display liquid crystal box away from the dimming box.

[0014] In one achievable manner, a third polarizer is provided on a side of the display liquid crystal box away from the dimming box, and a light transmission axis of the third polarizer is perpendicular to a light transmission axis of the first polarizer.

[0015] In one achievable manner, the third polarizer is an ultra-wide viewing angle polarizer.

[0016] In one achievable manner, at least one of the first polarizer and the second polarizer is a composite structure film of an APF film and a viewing angle compensation film.

[0017] The utility model also provides a display device, comprising the above-mentioned liquid crystal display panel.

[0018] The liquid crystal display panel provided by the utility model is provided with a dimming box, and the liquid crystal display panel can be switched between a wide viewing angle mode and a narrow viewing angle mode by controlling the voltage applied between the first electrode and the second electrode. At the same time, by limiting the relationship between the alignment direction of the first alignment layer, the alignment direction of the second alignment layer, the light transmission axis direction of the first polarizer, and the light transmission axis direction of the second polarizer, when the liquid crystal display panel is in the narrow viewing angle mode, the unidirectional narrow viewing angle of the liquid crystal display panel can be achieved, that is, the unidirectional anti-peeping of the liquid crystal display panel can be achieved to meet the needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of the liquid crystal display panel in the first embodiment of the present invention when it is in a wide viewing angle mode.

[0020] Figure 2 It is a cross-sectional schematic diagram of the liquid crystal display panel in the first embodiment of the utility model when it is in a narrow viewing angle mode.

[0021] Figure 3 It is a schematic diagram of the alignment direction of the first alignment layer in the first embodiment of the utility model.

[0022] Figure 4 FIG. 1 is a schematic diagram of the alignment direction of the first alignment layer in another embodiment of the present invention.

[0023] Figure 5 It is a cross-sectional schematic diagram of a liquid crystal display panel in the second embodiment of the present utility model.

[0024] Figure 6It is a cross-sectional schematic diagram of a liquid crystal display panel in the third embodiment of the present utility model.

[0025] Figure 7 It is a cross-sectional schematic diagram of a liquid crystal display panel in the fourth embodiment of the present utility model.

[0026] Figure 8 It is a schematic cross-sectional view of a liquid crystal display panel in a fifth embodiment of the present invention.

[0027] Fig. 9 This is a simulation diagram of the liquid crystal display panel in the first embodiment of the utility model when it is in a narrow viewing angle mode. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] The directional words such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of the utility model are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional words should not limit the scope of protection requested by this application.

[0031] First embodiment

[0032] Figure 1 This is a cross-sectional schematic diagram of the liquid crystal display panel in the first embodiment of the utility model when it is in a wide viewing angle mode. Figure 2 This is a cross-sectional schematic diagram of the liquid crystal display panel in the first embodiment of the utility model when it is in a narrow viewing angle mode. Figure 3 Schematic diagram of the alignment direction of the first alignment layer in the first embodiment of the utility model. Figures 1 to 3As shown, the embodiment of the utility model provides a liquid crystal display panel, including a stacked display liquid crystal box 1, a dimming box 2 and a backlight module 3, the display liquid crystal box 1 and the dimming box 2 are both located on the light-emitting side of the backlight module 3 (i.e., the side close to the user), and the dimming box 2 is located on the light-incoming side of the display liquid crystal box 1, i.e., the dimming box 2 is located on the side of the display liquid crystal box 1 close to the backlight module 3, i.e., the dimming box 2 is located between the display liquid crystal box 1 and the backlight module 3 (of course, in other embodiments, the dimming box 2 can also be arranged on the light-emitting side of the display liquid crystal box 1, i.e., the dimming box 2 is located on the side of the display liquid crystal box 1 away from the backlight module 3). The dimming box 2 is used to control the viewing angle of the liquid crystal display panel, the display liquid crystal box 1 is used to control the liquid crystal display panel to display a normal picture, and the backlight module 3 is used to provide a backlight source for the liquid crystal display panel.

[0033] The dimming box 2 includes a first substrate 21, a second substrate 22 disposed opposite to the first substrate 21, and a first liquid crystal layer 23 disposed between the first substrate 21 and the second substrate 22. In this embodiment, the first liquid crystal layer 23 preferably uses positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy.

[0034] A first polarizer 41 is provided on the first substrate 21, and a second polarizer 42 is provided on the second substrate 22. The light transmission axis of the first polarizer 41 and the light transmission axis of the second polarizer 42 are parallel to each other. A first electrode 24 is provided on the first substrate 21 on a side close to the first liquid crystal layer 23, and a second electrode 25 matched with the first electrode 24 is provided on the second substrate 22. A first alignment layer 26 is provided on the first substrate 21 on a side close to the first liquid crystal layer 23, and a second alignment layer 27 is provided on the second substrate 22 on a side close to the first liquid crystal layer 23; the first alignment layer 26 and the second alignment layer 27 cooperate to initially align the liquid crystal molecules in the first liquid crystal layer 23. The alignment direction of the first alignment layer 26 is the same as that of the second alignment layer 27 (i.e., they are parallel to each other), and the angle a between the alignment direction of the first alignment layer 26 and the light transmission axis of the first polarizer 41 is 40° to 80° (e.g., 80°). Figure 3 As shown in the figure, the direction indicated by the arrow P is the alignment direction of the first alignment layer 26, and the direction indicated by the arrow T is the transmission axis direction of the first polarizer 41).

[0035] In this embodiment, the angle of the light transmission axis of the first polarizer 41 and the angle of the light transmission axis of the second polarizer 42 are both 0° (i.e., the light transmission axis of the first polarizer 41 and the light transmission axis of the second polarizer 42 are parallel to the left-right direction of the liquid crystal display panel), thereby realizing one-way privacy protection of the liquid crystal display panel in the left-right direction (of course, in other embodiments, the light transmission axis of the first polarizer 41 and the light transmission axis of the second polarizer 42 can also be other angles, thereby realizing one-way privacy protection in other directions). In the initial state, the liquid crystal molecules in the first liquid crystal layer 23 are in a lying position, i.e., the long axis direction of the liquid crystal molecules in the first liquid crystal layer 23 is substantially parallel to the surface of the first substrate 21 and the second substrate 22. Figure 1 As shown, when the first electrode 24 and the second electrode 25 apply a wide viewing angle voltage signal or no voltage is applied, the voltage difference between the first electrode 24 and the second electrode 25 is small (for example, the voltage difference is 0V), and the liquid crystal molecules in the first liquid crystal layer 23 remain in a flat position, so that the liquid crystal display panel displays at a wide viewing angle. Figure 2 As shown, when the first electrode 24 and the second electrode 25 apply a narrow viewing angle voltage signal, the voltage difference between the first electrode 24 and the second electrode 25 is relatively large (for example, the voltage difference is 2.8V). At this time, a strong vertical electric field is formed between the first electrode 24 and the second electrode 25. The liquid crystal molecules in the first liquid crystal layer 23 are vertically deflected under the action of the vertical electric field, so that the liquid crystal molecules change from a lying posture to a tilted posture. At the same time, since the angle a between the alignment direction of the first alignment layer 26 and the light transmission axis of the first polarizer 41 is 40° to 80°, the angle between the projection of the long axis of the liquid crystal molecules on the substrate and the light transmission axis of the first polarizer 41 and the second polarizer 42 is also 40° to 80°, that is, the liquid crystal molecules are tilted toward the upper right, so that the display brightness of the left viewing angle of the liquid crystal display panel is reduced, while the display brightness of the right viewing angle remains basically unchanged, thereby realizing the left viewing angle one-way peeping protection of the liquid crystal display panel, while the right viewing angle is still a wide viewing angle.

[0036] Fig. 9 This is a simulation diagram of the liquid crystal display panel in the first embodiment of the utility model when it is in a narrow viewing angle mode. Fig. 9 As shown in the figure, when the angle a is 75° and 80° respectively, the brightness of the left viewing angle (i.e. the main driver's viewing angle) of the LCD panel in the narrow viewing angle mode is very low, while the brightness of the right viewing angle (i.e. the co-pilot's viewing angle) is almost unaffected, that is, the LCD panel has a good one-way anti-peeping effect. When the LCD panel is applied to the vehicle-mounted central control screen, in the narrow viewing angle mode, the co-pilot can normally watch the content played on the vehicle-mounted central control screen, while the driver cannot see the content played on the vehicle-mounted central control screen, so as to keep attention focused and thus improve driving safety.

[0037] like Figure 4As shown, as another embodiment, the angle a between the alignment direction of the first alignment layer 26 and the light transmission axis of the first polarizer 41 is 100° to 140°. When the first electrode 24 and the second electrode 25 apply a wide viewing angle voltage signal or no voltage is applied, the voltage difference between the first electrode 24 and the second electrode 25 is small (for example, the voltage difference is 0V), and the liquid crystal molecules in the first liquid crystal layer 23 remain in a flat position, so that the liquid crystal display panel displays at a wide viewing angle. When the first electrode 24 and the second electrode 25 apply a narrow viewing angle voltage signal, the voltage difference between the first electrode 24 and the second electrode 25 is relatively large (for example, the voltage difference is 2.8V). At this time, a strong vertical electric field is formed between the first electrode 24 and the second electrode 25. The liquid crystal molecules in the first liquid crystal layer 23 are vertically deflected under the action of the vertical electric field, so that the liquid crystal molecules change from a lying posture to a tilted posture. At the same time, since the angle a between the alignment direction of the first alignment layer 26 and the light transmission axis of the first polarizer 41 is 100°~140°, the angle between the projection of the long axis of the liquid crystal molecules on the substrate and the light transmission axis of the first polarizer 41 and the second polarizer 42 is also 100°~140°, that is, the liquid crystal molecules are tilted toward the upper left, so that the display brightness of the right viewing angle of the liquid crystal display panel is reduced, while the display brightness of the left viewing angle remains basically unchanged, thereby realizing the one-way anti-peeping of the right viewing angle of the liquid crystal display panel, while the left viewing angle is still a wide viewing angle.

[0038] like Figure 1 As shown, as an embodiment, the display liquid crystal box 1 includes a third substrate 11 and a second liquid crystal layer 12, the third substrate 11 is arranged opposite to the second substrate 22, and the third substrate 11 is located on the side of the second substrate 22 away from the first substrate 21; specifically, the first substrate 21 is located on the side of the second substrate 22 close to the backlight module 3, and the third substrate 11 is located on the side of the second substrate 22 away from the backlight module 3. The second liquid crystal layer 12 is arranged between the third substrate 11 and the second substrate 22, and a pixel electrode 14 matching with the second electrode 25 is provided on the side of the third substrate 11 close to the second liquid crystal layer 12. Preferably, the second electrode 25 is arranged on the side of the second substrate 22 close to the second liquid crystal layer 12 (of course, in other embodiments, the second electrode 25 can also be arranged on the side of the second substrate 22 close to the first liquid crystal layer 23). That is, in this embodiment, the display liquid crystal box 1 and the dimming box 2 share the same second substrate 22 and the same second electrode 25, thereby reducing the thickness of the liquid crystal display panel and reducing the cost of the liquid crystal display panel. By applying a grayscale voltage between the pixel electrode 14 and the second electrode 25 , the normal picture display of the display liquid crystal box 1 is realized; by applying a viewing angle control voltage between the first electrode 24 and the second electrode 25 , the wide and narrow viewing angle switching of the dimming box 2 is realized.

[0039] Specifically, in this embodiment, the first electrode 24 is a planar electrode that covers the entire surface of the first substrate 21, and the second electrode 25 is a planar electrode that covers the entire surface of the second substrate 22; the pixel electrode 14 is a block electrode, and the pixel electrode 14 is arranged in each pixel unit of the display liquid crystal box 1. The first electrode 24, the second electrode 25 and the pixel electrode 14 are all made of transparent conductive materials, such as indium tin oxide (ITO), indium zinc oxide (IZO) or aluminum zinc oxide. The first substrate 21, the second substrate 22 and the third substrate 11 can be made of transparent glass, transparent plastic and other materials; at the same time, in order to avoid the distance between the first electrode 24 and the second electrode 25 being too large to affect the electric field strength between the first electrode 24 and the second electrode 25, the thickness of the second substrate 22 can be set to be thinner, and the thickness of the second substrate 22 is less than the thickness of the first substrate 21 and the third substrate 11.

[0040] As an embodiment, a plurality of thin film transistors (not shown, i.e., TFTs) are provided on a side of the third substrate 11 close to the second liquid crystal layer 12, and the plurality of thin film transistors are electrically connected to each pixel electrode 14, respectively; each pixel electrode 14 is connected to a scan line (not shown) and a data line (not shown) through a corresponding thin film transistor.

[0041] As an implementation mode, a third alignment layer (not shown) is provided on the side of the second substrate 22 close to the second liquid crystal layer 12, and a fourth alignment layer (not shown) is provided on the side of the third substrate 11 close to the second liquid crystal layer 12, and the third alignment layer and the fourth alignment layer cooperate to initially align the liquid crystal molecules in the second liquid crystal layer 12. In this embodiment, the third alignment layer and the fourth alignment layer are perpendicular to each other, the alignment direction of the third alignment layer is 0°, and the alignment direction of the fourth alignment layer is 90°.

[0042] As an embodiment, a color resist layer (not shown) is further provided in the display liquid crystal box 1, and the color resist layer is arranged on the side of the third substrate 11 close to the second liquid crystal layer 12 or on the side of the second substrate 22 close to the second liquid crystal layer 12 to realize color display of the liquid crystal display panel. The color resist layer includes a plurality of red color resist blocks, a plurality of green color resist blocks, and a plurality of blue color resist blocks, which are respectively arranged in a plurality of pixel units, and adjacent color resist blocks are separated by a black matrix (not shown, i.e., BM).

[0043] like Figure 1 As shown, as an implementation mode, a third polarizer 43 is provided on the side of the display liquid crystal box 1 away from the dimming box 2 (that is, in this embodiment, the third polarizer 43 is located on the light emitting side of the display liquid crystal box 1), and the light transmission axis of the third polarizer 43 is perpendicular to the light transmission axis of the first polarizer 41, that is, in this embodiment, the angle of the light transmission axis of the third polarizer 43 is 90°.

[0044] As an implementation mode, the third polarizer 43 is an ultra-wide viewing angle polarizer (EWV Polarizer), thereby increasing the emission angle of light at a wide viewing angle, thereby improving the display effect of the liquid crystal display panel at a wide viewing angle (the structure and function of the ultra-wide viewing angle polarizer can be referred to the prior art and will not be repeated here).

[0045] As an embodiment, the first polarizer 41 and the second polarizer 42 are both ordinary polarizers, such as linear polarizers. As another embodiment, at least one of the first polarizer 41 and the second polarizer 42 is a composite structure film of an APF film and a viewing angle compensation film. The composite structure film has both polarization and reflection effects, and the bright surface of the composite structure film is always facing upward (i.e., facing outward), thereby further increasing the narrow viewing angle effect (the specific structure and function of the composite structure film can refer to the prior art, such as patent CN114594622B, which will not be repeated here). Preferably, the first polarizer 41 and the second polarizer 42 are both composite structure films.

[0046] like Figure 1 As shown, as an embodiment, the first polarizer 41 is disposed on the side of the first substrate 21 away from the first liquid crystal layer 23 (that is, the first polarizer 41 is disposed outside the dimming box 2), the second polarizer 42 is disposed on the side of the second substrate 22 close to the first liquid crystal layer 23 (that is, the second polarizer 42 is disposed in the dimming box 2), and the second polarizer 42 is located between the second alignment layer 27 and the second substrate 22. Of course, in other embodiments, the first polarizer 41 can also be disposed on the side of the first substrate 21 close to the first liquid crystal layer 23 (that is, the first polarizer 41 is disposed in the dimming box 2); the second polarizer 42 can also be disposed on the side of the second substrate 22 close to the second liquid crystal layer 12 (that is, the second polarizer 42 is disposed in the display liquid crystal box 1).

[0047] As an implementation manner, the backlight module 3 can be a direct-type backlight module, an edge-type backlight module, etc.

[0048] An embodiment of the utility model further provides a display device, comprising the above-mentioned liquid crystal display panel.

[0049] The liquid crystal display panel provided by the utility model is provided with a dimming box 2, and the liquid crystal display panel can be switched between a wide viewing angle mode and a narrow viewing angle mode by controlling the voltage applied between the first electrode 24 and the second electrode 25. At the same time, by limiting the relationship between the alignment direction of the first alignment layer 26, the alignment direction of the second alignment layer 27, the light transmission axis direction of the first polarizer 41, and the light transmission axis direction of the second polarizer 42, when the liquid crystal display panel is in the narrow viewing angle mode, a unidirectional narrow viewing angle of the liquid crystal display panel can be achieved, that is, a unidirectional anti-peeping of the liquid crystal display panel can be achieved to meet user needs.

[0050] Second embodiment

[0051] Figure 5 FIG. 2 is a cross-sectional schematic diagram of a liquid crystal display panel in a second embodiment of the present invention. Figure 5 As shown, the liquid crystal display panel provided in the second embodiment of the present invention is substantially the same as that in the first embodiment, except that the relative position relationship between the display liquid crystal box 1 and the dimming box 2 is different.

[0052] Specifically, in this embodiment, the dimming box 2 is arranged on the light emitting side of the display liquid crystal box 1, that is, the dimming box 2 is located on the side of the display liquid crystal box 1 away from the backlight module 3. At this time, the first substrate 21 is located on the side of the second substrate 22 away from the backlight module 3, the third substrate 11 is located on the side of the second substrate 22 close to the backlight module 3, and the third polarizer 43 is located between the display liquid crystal box 1 and the backlight module 3.

[0053] Other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0054] Third embodiment

[0055] Figure 6 FIG. 4 is a cross-sectional schematic diagram of a liquid crystal display panel in a third embodiment of the present utility model. Figure 6 As shown, the liquid crystal display panel provided by the third embodiment of the present invention is substantially the same as that of the first embodiment, except that the structure of the display liquid crystal cell 1 is different and the arrangement position of the second electrode 25 is different.

[0056] Specifically, in this embodiment, the display liquid crystal box 1 includes a third substrate 11 and a second liquid crystal layer 12. The third substrate 11 is arranged opposite to the second substrate 22. The third substrate 11 is located on a side of the second substrate 22 away from the first substrate 21. The second liquid crystal layer 12 is arranged between the third substrate 11 and the second substrate 22. The second electrode 25 is arranged on a side of the second substrate 22 close to the first liquid crystal layer 23.

[0057] A pixel electrode 14 is provided on the side of the second substrate 22 close to the second liquid crystal layer 12, and a common electrode 15 matching the pixel electrode 14 is provided on the side of the third substrate 11 close to the second liquid crystal layer 12. The common electrode 15 is a planar electrode that covers the entire surface of the third substrate 11. That is, in this embodiment, the display liquid crystal box 1 and the dimming box 2 share the same second substrate 22, but the two do not share the second electrode 25. By applying a grayscale voltage between the pixel electrode 14 and the common electrode 15, the normal picture display of the display liquid crystal box 1 is realized; by applying a viewing angle control voltage between the first electrode 24 and the second electrode 25, the wide and narrow viewing angle switching of the dimming box 2 is realized.

[0058] Of course, in other embodiments, the pixel electrode 14 may be provided on the side of the third substrate 11 close to the second liquid crystal layer 12 , and the common electrode 15 matching the pixel electrode 14 may be provided on the side of the second substrate 22 close to the second liquid crystal layer 12 .

[0059] Other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0060] Fourth embodiment

[0061] Figure 7 FIG. 4 is a cross-sectional schematic diagram of a liquid crystal display panel in a fourth embodiment of the present invention. Figure 7 As shown, the liquid crystal display panel provided by the fourth embodiment of the present invention is basically the same as the first embodiment, except that the structure of the display liquid crystal cell 1 is different, and the second electrode 25 and the second polarizer 42 are arranged at different positions.

[0062] Specifically, in this embodiment, the display liquid crystal box 1 includes a third substrate 11, a fourth substrate 13 arranged opposite to the third substrate 11, and a second liquid crystal layer 12 arranged between the third substrate 11 and the fourth substrate 13. A pixel electrode 14 is arranged on the side of the third substrate 11 close to the second liquid crystal layer 12, and a common electrode 15 matched with the pixel electrode 14 is arranged on the side of the fourth substrate 13 close to the second liquid crystal layer 12; the second electrode 25 is arranged on the side of the second substrate 22 close to the first liquid crystal layer 23. That is, in this embodiment, the display liquid crystal box 1 and the dimming box 2 do not share the second substrate 22 or the second electrode 25. By applying a grayscale voltage between the pixel electrode 14 and the common electrode 15, the normal picture display of the display liquid crystal box 1 is realized; by applying a viewing angle control voltage between the first electrode 24 and the second electrode 25, the wide and narrow viewing angle switching of the dimming box 2 is realized.

[0063] like Figure 7 As shown, in this embodiment, the fourth substrate 13 is located on the side of the third substrate 11 away from the dimming box 2. Of course, in other embodiments, the third substrate 11 may also be located on the side of the fourth substrate 13 away from the dimming box 2.

[0064] like Figure 7 As shown, in this embodiment, the second polarizer 42 is disposed between the display liquid crystal box 1 and the dimming box 2 (specifically, the second polarizer 42 is located between the second substrate 22 and the third substrate 11 ).

[0065] Other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0066] Fifth embodiment

[0067] Figure 8FIG. 4 is a cross-sectional schematic diagram of a liquid crystal display panel in a fifth embodiment of the present utility model. Figure 8 As shown, the liquid crystal display panel provided in the fifth embodiment of the utility model is basically the same as the first embodiment, except that the structure of the display liquid crystal cell 1 is different, and the third polarizer 43 is not provided in this embodiment.

[0068] Specifically, in this embodiment, the second liquid crystal layer 12 is a dye liquid crystal layer, which includes liquid crystal molecules 121 and dye liquid crystal molecules 122 that are mixed with each other; the dye liquid crystal layer has a light absorption state and a light transmission state and can switch between the two states. No polarizer is set on the side of the display liquid crystal box 1 away from the dimming box 2.

[0069] Specifically, by applying different voltages, the arrangement directions of the liquid crystal molecules 121 and the dye liquid crystal molecules 122 can be switched between being parallel to the second substrate 22 and being perpendicular to the second substrate 22 . When no voltage is applied to the dye liquid crystal layer in a certain pixel unit (i.e., in the initial state), the dye liquid crystal molecule 122 is arranged in a spiral with the liquid crystal molecule 121. At this time, the long axis of the liquid crystal molecule 121 and the long axis of the dye liquid crystal molecule 122 are both parallel to the second substrate 22 (the liquid crystal molecule 121 and the dye liquid crystal molecule 122 are both elliptical structures). At this time, the dye liquid crystal in the pixel unit is in a light-absorbing state (the dye liquid crystal molecule 122 has a strong ability to absorb light in the long axis direction and a very weak ability to absorb light in the short axis direction. When visible light with a polarization direction parallel to the long axis of the dye liquid crystal molecule 122 is incident on the dye liquid crystal molecule 122, the absorption rate of the dye liquid crystal molecule 122 to the visible light reaches a maximum; when visible light with a polarization direction parallel to the short axis of the dye liquid crystal molecule 122 is incident on the dye liquid crystal molecule 122, the absorption rate of the dye liquid crystal molecule 122 to the visible light reaches a minimum), and the light emitted by the backlight module 3 cannot pass through the pixel unit, so the pixel unit is in a dark state. When a voltage is applied to the dye liquid crystal layer in a certain pixel unit, the dye liquid crystal molecules 122 are arranged vertically with the liquid crystal molecules 121, that is, the long axes of the liquid crystal molecules 121 and the dye liquid crystal molecules 122 are both perpendicular to the second substrate 22. At this time, the dye liquid crystal in the pixel unit is in a light-transmitting state, and the light emitted by the backlight module 3 can pass through the pixel unit, so the pixel unit is in a bright state. At the same time, by applying different grayscale voltages, the grayscale brightness of the pixel unit can be adjusted, thereby achieving normal picture display (the working principle of the dye liquid crystal layer can be referred to the prior art, which will not be repeated here). Therefore, when the second liquid crystal layer 12 is a dye liquid crystal layer, there is no need to set a polarizer on the side of the display liquid crystal box 1 away from the dimming box 2.

[0070] Other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0071] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A liquid crystal display panel, characterized in that: The invention comprises a display liquid crystal box (1), a dimming box (2) and a backlight module (3) which are stacked, wherein the display liquid crystal box (1) and the dimming box (2) are both located on the light-emitting side of the backlight module (3), and the dimming box (2) is located on the light-incoming side or the light-emitting side of the display liquid crystal box (1); the dimming box (2) comprises a first substrate (21), a second substrate (22) arranged opposite to the first substrate (21), and a first liquid crystal layer (23) arranged between the first substrate (21) and the second substrate (22); A first polarizer (41) is provided on the first substrate (21), and a second polarizer (42) is provided on the second substrate (22); the light transmission axis of the first polarizer (41) and the light transmission axis of the second polarizer (42) are parallel to each other; a first electrode (24) is provided on the first substrate (21) on a side close to the first liquid crystal layer (23), and a second electrode (25) matched with the first electrode (24) is provided on the second substrate (22); a first alignment layer (26) is provided on the first substrate (21) on a side close to the first liquid crystal layer (23), and a second alignment layer (27) is provided on the second substrate (22) on a side close to the first liquid crystal layer (23); the alignment direction of the first alignment layer (26) is the same as the alignment direction of the second alignment layer (27), and the angle (a) between the alignment direction of the first alignment layer (26) and the light transmission axis of the first polarizer (41) is 40° to 80° or 100° to 140°.

2. The liquid crystal display panel according to claim 1, wherein: The angle of the light transmission axis of the first polarizer (41) and the angle of the light transmission axis of the second polarizer (42) are both 0°.

3. The liquid crystal display panel according to claim 1, wherein: The display liquid crystal box (1) comprises a third substrate (11) and a second liquid crystal layer (12); the third substrate (11) and the second substrate (22) are arranged opposite to each other; the third substrate (11) is located on a side of the second substrate (22) away from the first substrate (21); the second liquid crystal layer (12) is arranged between the third substrate (11) and the second substrate (22); a pixel electrode (14) cooperating with the second electrode (25) is arranged on a side of the third substrate (11) close to the second liquid crystal layer (12); the second electrode (25) is arranged on a side of the second substrate (22) close to the second liquid crystal layer (12).

4. The liquid crystal display panel according to claim 1, wherein: The display liquid crystal box (1) comprises a third substrate (11) and a second liquid crystal layer (12); the third substrate (11) and the second substrate (22) are arranged opposite to each other; the third substrate (11) is located on a side of the second substrate (22) away from the first substrate (21); the second liquid crystal layer (12) is arranged between the third substrate (11) and the second substrate (22); and the second electrode (25) is arranged on a side of the second substrate (22) close to the first liquid crystal layer (23); A pixel electrode (14) is provided on a side of the second substrate (22) close to the second liquid crystal layer (12), and a common electrode (15) matching the pixel electrode (14) is provided on a side of the third substrate (11) close to the second liquid crystal layer (12); or, a pixel electrode (14) is provided on a side of the third substrate (11) close to the second liquid crystal layer (12), and a common electrode (15) matching the pixel electrode (14) is provided on a side of the second substrate (22) close to the second liquid crystal layer (12).

5. The liquid crystal display panel according to claim 1, wherein: The display liquid crystal box (1) comprises a third substrate (11), a fourth substrate (13) arranged opposite to the third substrate (11), and a second liquid crystal layer (12) arranged between the third substrate (11) and the fourth substrate (13); a pixel electrode (14) is arranged on a side of the third substrate (11) close to the second liquid crystal layer (12); a common electrode (15) matched with the pixel electrode (14) is arranged on a side of the fourth substrate (13) close to the second liquid crystal layer (12); and the second electrode (25) is arranged on a side of the second substrate (22) close to the first liquid crystal layer (23).

6. The liquid crystal display panel according to any one of claims 3 to 5, characterized in that: The second liquid crystal layer (12) is a dye liquid crystal layer, and the dye liquid crystal layer comprises liquid crystal molecules (121) and dye liquid crystal molecules (122) that are mixed with each other; and a polarizing film is not arranged on a side of the display liquid crystal box (1) away from the dimming box (2).

7. The liquid crystal display panel according to claim 1, wherein: A third polarizer (43) is provided on a side of the display liquid crystal box (1) away from the dimming box (2), and the light transmission axis of the third polarizer (43) is perpendicular to the light transmission axis of the first polarizer (41).

8. The liquid crystal display panel according to claim 7, wherein: The third polarizer (43) is an ultra-wide viewing angle polarizer.

9. The liquid crystal display panel according to claim 1, wherein: At least one of the first polarizer (41) and the second polarizer (42) is a composite structure film of an APF film and a viewing angle compensation film.

10. A display device, characterized in that: Comprising a liquid crystal display panel as described in any one of claims 1-9.

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